Some standard content:
ICS 65.060.10
Machinery Industry Standard of the People's Republic of China
JB/T9844-1999
Permanent magnet alternator for tractors
Magneto-gcnerator for tractors1999-08-06 Issued
National Bureau of Machinery Industry
2000-01-01 Implementation
JB/F9844-1999
This standard is a revision of ZBT6B004-90 (Permanent magnet alternator for tractors). Editorial changes were made to the original standard during the revision, and the main technical content remained unchanged. This standard replaces ZBT6B004-90 from the date of implementation. Appendix A of this standard is the appendix of the standard. This standard was proposed and approved by the National Technical Inspection Conference on Standardization of Tractors. This standard was drafted by Luoyang Tractor Research Institute, Henan Dongxing Internal Combustion Engine Co., Ltd. The main drafters of this standard are Wang Shuhai and Wang Jialian. Scope
Machinery Industry Standard of the People's Republic of China
Permanent magnet alternator for tractors
Magneto-geaerator for tractorsJE/T9844—1999
ZIT68004—00
This standard specifies the type and design, technical requirements, test methods, inspection specifications, labeling, packaging, transportation and storage of permanent magnet alternators for tractors.
This standard applies to permanent magnet alternating current generators for lighting used in tractors, agricultural transport vehicles, other motorized agricultural and forestry machinery and fixed internal excitation machines (referred to as generators)
2 Referenced standards
The provisions contained in the underlined standards are valid for the provisions of this standard by reference in this standard. All standards are subject to revision. Parties using this standard should consider the possibility of using the latest versions of the following standards: R.T2828-1987 Inspection of batches and sampling tables (applicable to inspection of consecutive batches) GRT4942.1-1985 Motor external research classification JB/T66971993
Type and material number
Technical conditions for basic connection of tractor electrical equipment
3.! Requirements for the use of generator batches Heat-resistant type and damp heat type, 3.2 Structural type of generator The types can be divided into pulley type, flywheel type, friction wheel type and fan-generator, etc. 3.3 The generator is a continuous fixed belt.
3.4 Basic parameters of generators
3.4.1 The nominal voltage of the generator is 6V and 12V, and the power level is recommended to be 30, 45, 60, 90, 120, 150W and above (the user's requirements are determined separately).
3.4.2 The rated working speed of the generator is the corresponding working speed of the matching engine at the rated speed: the highest working speed is the rated working speed 110% of rated speed: minimum operating speed is 50% of rated speed (or user requirements 4 Technical requirements
4.1 The generator shall meet the requirements of this standard and be manufactured in accordance with the drawings and technical documents approved by the prescribed procedures. 4.2 The installation dimensions and appearance of the generator shall comply with the provisions of the corresponding product appearance drawing. 4.3 Unless otherwise specified, the generator test shall be carried out under the following test conditions: Temperature: 23±5: Humidity: 45%-75%: Air: 86-106kP4.4 Generator 1. After the working environment temperature is checked, the appearance and quality are intact, without damage or cracks, and the performance should meet the requirements of 4.9. The working environment temperature of the camshaft is shown in Figure 1.
Approved by the State Administration of Machinery Industry on August 6, 1999 and implemented on January 1, 2000
Generator plastic type
Shielded type
Flywheel type
Friction wheel type
Fan-generator
JBT9844—1999
Magnetic working temperature
-40 + 3
Highest, sugar content
75 ±2
75 ±2
4.5 The generator should be able to withstand the sensible heat test. The test cycle for ordinary type is 2d, and the test cycle for wet heat type is 6d. After the test, the generator should meet the requirements of cold performance inspection according to 4.9:
4.6 The generator can withstand the fixed vibration, sweeping perturbation or impact test specified in 3.10 of JB/T6697-1993. After the test, there is no damage to the parts, no loosening of the firmware, and the cold performance of the generator should meet the requirements. 4. The protection level, marking method and corresponding test of the generator shall comply with the provisions of GBT4942.1. The protection level shall be noted in the technical specifications of the corresponding products (IP54 is recommended for pulley and friction wheel generators) 4.8 The generator must be equipped with the specified bulb as a fixed load. The specifications, type and connection method of the bulb shall be clearly specified in the product technical specifications.
4.9 Cold working performance of generator
4.9.1 When the ambient temperature is 23%℃±5℃, the cold working performance of the generator under rated load shall comply with the provisions of Table 2. Table 2
Nominal voltage
Number of working speed
Each phase voltage
Tentative working transfer time
High working speed
Note: The values in brackets are for flywheel generators operating under commercial conditions for a long time. For permanent flywheel generators, the values outside the brackets are allowed. 4.9.1 When the generator is in low-voltage operation under rated load, the total voltage of each phase is less than 10.5VYV
The insulation strength between each non-connected conductive parts and the casing shall comply with the provisions of JB/T6697-1993 3.11. 4.10
The generator shall withstand the overspeed test at a rated working speed of 22. After 2 hours, the fastening shall not be loosened and the parts shall not be damaged. 4.
And the cold state performance shall meet the requirements according to 4.9. 4.1 The temperature rise limit of the generator winding shall meet the requirements of Table 3. Table 3
The maximum spot level
Temperature rise limit
4.13 Appearance and assembly quality requirements of the generator
4.13.1 The appearance shall be free of damage. 4.13.2 The surface of the die casting shall be smooth, without pores, sand holes, obvious cold effects, etc. 2
4.13.3 There shall be no wrong installation or misassembly of parts and components, and no secret sale of fasteners.
4.13.5 Parts and components shall not be damaged.
There shall be no cracking or missing of permanent magnets, and no degradation or cracking of various fillers.
There shall be no abnormal mechanical noise when the generator rotates.
4.13.8
4.13.9 The signage shall comply with the product drawing requirements. JB/T9844-1999
4.14 The electroplating layer and chemical treatment layer of the black metal coating of the generator shall be free of rust, peeling and rusting:
4.1! The original plate of the external oil coating of the generator shall comply with the provisions of JB/T6697-13. 4.16 The disassembled parts of the generator of different models shall be interchangeable. 4.17 The generator shall be subjected to a 200h intensive test before and a 3000h long-term test. After the test, the cold state performance shall be checked according to 4.9, and a 5% decrease from the current value is allowed.
4.18 After the wet heat test, the shrinkage strength, electrical components and chemical treatment components appearance quality, metal plate or car material lubrication quality, paint adhesion, and plastic parts appearance quality shall meet the requirements of [B/T6697-1993 3.17. 4.19 The wet heat generator shall withstand the salt test specified in 3.t4 of JB/T6697-1993. After the test, the generator shall be connected to 4.9 for cold state performance.
4.20 The cooling generator shall be able to withstand the long-term test specified in 3.18 of JB.T6697-1993. 5 Test method
5.1 Test meter
The accuracy of the rectifier type electric meter and other electrical measuring instruments used in the test shall not be less than Class 1.0. 5.1 Test method and procedure
5.2.1 External gauge and assembly quality inspection
Use visual inspection or use tools to check the items in 4.13, which shall comply with the provisions of the regulations. 5.2.2 Installation and shape size inspection
Use the inspection board with the required accuracy of the drawing to check each item according to the requirements of the corresponding product appearance drawing. 5.2.3 Parts protection inspection
Use the naked eye to inspect the product. During the factory test, only the external parts of the product are inspected, and the internal parts are inspected during the replacement test.
5.2.4 Paint layer inspection
The paint layer inspection shall be carried out in accordance with the provisions of 4.3 of JR.T6697-.1993.5.2.5 Cold performance test
The generator is installed on the test machine and driven from low speed to high speed according to the specified rated load (can be replaced by equivalent positive value resistor, see Appendix A for details). The voltage at each output terminal of the machine is also measured by an ammeter. The total speed and rated voltage value should comply with the provisions of 4.9. s.2.6 Withstand k test
Perform according to JB:TGG97-19931.7
5. 2.7 Overspeed test
JB/T9844-1999
Under the condition of no load, control the speed according to 4.11 to the specified time. After the test, wait for the generator to cool to the ambient temperature and check the cold state performance according to 4.9.
5.2.# Vibration or shock test
The generator is not in operation. It is carried out according to 4.7 of JB/T6697-1993. After each test, check the cold state performance according to 4.9. 5.2.9 Temperature test
The generator is continuously operated at the rated working speed and rated load until the temperature rise is stable. Check the temperature rise of the generator winding. The temperature rise measurement and calculation are carried out according to 4.4 of JB/T6697-1993. 5.2.10 Temperature change test
Put the product directly into the low temperature box specified in the table for 2 hours, take it out and place it at room temperature for 2-3 minutes (if using automatic two-box equipment, it can be less than 305, and it does not need to be placed at room temperature for a day). Then put the product into the high temperature box for 2 hours, take it out and place it at room temperature for 2~3 minutes. The above test is one cycle, and a total of 5 cycles are tested. After the low temperature cycle is completed, take out the generator and check the working performance of the motor at room temperature. The generator is required to generate electricity at the three specified speeds.
After all temperature change tests are completed, wait for the product to cool to the ambient temperature and check the cold performance according to 4.9. 5.2.11 High temperature test
Put the generator in a high temperature box with some air conditioning equipment, and heat it to the high temperature level specified in the table. The generator works for 3 hours at a certain operating speed and rated load (equivalent resistance can be used instead). During the test, the generator performance should meet the requirements of Table 4. After the test, wait for the product to cool to the ambient temperature and check the cold performance according to 4.9. Table 4
Standard voltage
5.2.12 Wet heat test
When the working voltage is set, each circuit (phase) terminal is 1
Perform according to the provisions of 4.11 in JB/66971993. After the test, place under the test conditions specified in 4.3 for 1-2 hours, and check the cold performance according to 4.9: the damp and hot type products shall be checked again according to 4.18. .23 Protection level inspection
The protection level inspection method of the generator shall be carried out in accordance with the provisions of 442.1 of GB 442.1. 5.2.14 Interchangeability test
After disassembling three products of the same model, mix their parts and then check the internal assembly quality of the product and the protection treatment quality of the internal parts; after installation, check the product performance, which shall still meet the requirements of 4.9. 9.2.15 Durability
The durability test of the generator can be carried out by one of the following methods, preferably high humidity and high speed test. 5.2.15.2 High temperature and high speed test [Strengthening] The generator is installed in the test bench, and the temperature and speed are controlled according to the test conditions specified in Table 5 according to the specified frequency and load. The test is carried out until the specified time. Motor type Pulley type Flywheel type Friction wheel type Wind turbine 5.2.15.2 General endurance test Test range JB/T9844—1999 Test speed 3 000rmim or less is 2 times the rated speed: 4 000h/in 1: 1.5 Times
rated speed
test timeh
Install the generator on a special acid test bench at actual temperature. The generator works at the rated speed and rated load. The estimated working time should be 3 000h
During the whole test, the lubricant is allowed to be replaced once and the test is allowed to be interrupted, but the continuous working time each time shall not be less than 4 hours. 5.2.16 Salt dew test
The test method is in accordance with 4.12 of 1R/T6697-1993. The test duration is 16h. The test piece generator is placed under the test conditions specified in 4.3 for 1-2h, and the cold performance is checked according to 4.9. 5.3、17 days of test
The test method shall be carried out in accordance with the provisions of D/6697-1993 4.15. After 28 days of test, the ± products in the test box shall be immediately taken out for external inspection
6 Inspection and testing
6.1 Each generator must be inspected and qualified before it can be shipped out of the factory, and it shall be accompanied by documents or marks proving the quality of the product. 2 The test types of generators are divided into factory tests and type tests. 6.3 The factory test items of generators are as follows:
) Appearance and installation quality and inspection;
b) Installation and external dimensions inspection;
) Cold working performance test
d) Withstand voltage test.
6.4 The user has the right to accept the product in accordance with the provisions of 0B/T2828. This standard adopts: 1) Inspection level: 2) Qualified quality level: AQL=0.4~6.5; 3) Sampling plan: One-time routine inspection plan. The AQI, value, batch and acceptance items of the product shall be agreed upon by the manufacturer and the user. 6.5 Type test
6.5.1 Manufacturing! Type test should be conducted in one of the following situations: a) when new products are put into production and old products are transferred to the factory for finalization and appraisal; b) after formal production, if there are major changes in structure, materials, and design that may affect product performance: c) when the product is discontinued for more than one year and resumed production: JB/T9844—1999
c) when the factory test results are significantly different from the last type or inspection results: 6.5.2 Type test items include all test items listed in the standard, and each test should be conducted as soon as possible. 6.5.3 The generators for type test shall be selected from the same batch of qualified products or products, with a number of not less than 5 units, and divided into one or two groups. One group is 2 sets for long-term testing (for damp and hot products, samples should be taken from outside for mildew growth test, and the number of days should not be less than 2 pieces), and the evaluation is in accordance with the provisions of 5.4 of JB/T6697.
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7.1 Each generator should have a fixed sign or printed sign in a conspicuous position, and the content is as follows:
b) manufacturer's address and trademark address;
c) product name and model;
d) nominal power and power;
7.2 Packaging
.1.1 The packaging should take into account the relevant requirements of anti-flow, anti-dust, and transportation and loading and unloading; t.2.2 Before packaging, the parts of the black metal parts of the product should be protected from light, and temporary corresponding anti-rust measures should be taken. 7.2.3 The packing box should be of good quality. The product should not move easily in the box to avoid damage during transportation. The spare parts accompanying the product should be packed in the same box. The gross weight of each box after packing should not exceed 50kg. 7.2.4 The words and signs on the label of each packing box should include the following: a) Name and address of the shipping unit: b) Product name, model and effective number: d) Name of the shipping unit: d) Words and signs of transportation operation, gross weight of each box of products and other signs. Such as: "Be careful", "Do not invert", "Prevent damage", "Moisture-proof" and other words and signs. 7.3 The technical documents supplied with the product include: a) Packing list; b) Product inspection certificate: d) Maintenance instructions: d) Warranty card.
4 The product shall not be subjected to corrosion, heavy pressure, delay, acid, etc. and organic droplets during storage and transportation. A1 Equivalent resistance value (including special line resistance) Equivalent resistance value see Table A1.
Motion rate W
JE/T 9844—1999
Appendix A
(accurate resistance test)
Test resistance requirements
Equivalent resistance difference
Low. Working. Working. Reverse
2.4 (2.5)
1.T (1.8)
Standard: L. Working speed
2.8 (2.9)
1.9 (2.0)
Standard 1 Working reverse
2.1 (2.2)
Code: For flying type strong motors, the choice of bracketed or non-bracketed conduction shall be determined by the corresponding set of voltage values selected in Table 2 of this standard. A2 The material shall be copper alloy [copper] or spider alloy wire with a diameter of not less than 1mml. A3 The resistor shall be a non-inductive resistor.TGG97-19931.7 regulations
5. 2.7 Overspeed test
JB/T9844-1999
Under the condition of no load, control the speed according to 4.11 military requirements to the specified time. After the test, wait for the generator to cool to the ambient temperature and control the cold state performance according to 4.9.
5.2.# Vibration or shock test
Under the non-working state, the generator shall be carried out according to 4.7 of JB/T6697-1993. After each test, check the cold state performance according to 4.9. 5. 2. 9 Temperature test
The generator shall run continuously at the rated working speed and rated load until the temperature rise is stable. Check the temperature rise of the generator winding. The temperature rise measurement and calculation shall be carried out according to 4.4 of JB/T6697-1993. 5.2.10 Temperature change test
Put the product directly into the table! Put the product in the specified low temperature box for 2 hours, take it out and place it at room temperature for 2-3 minutes (if using automatic two-box equipment, it can be less than 305, and it does not need to be placed at room temperature for 2 days). Then put the product in the high temperature box for 2 hours, take it out and place it at room temperature for 2~3 minutes. The above test is one cycle, and a total of 5 cycles are tested. After the low temperature test of the last cycle is over, take out the generator and check the working performance of the motor during the time of placing it at room temperature. It is required that the generator can generate electricity at the three specified speeds.
After all temperature change tests are completed, wait for the product to cool to ambient temperature and check the cold state performance according to 4.9. 5.2.11 High temperature test
Put the generator in a high temperature box with some air conditioning equipment, and start to heat up to the high temperature position specified in Table 1. The generator works at a specified operating speed and rated load (can be replaced by a resistor of equivalent resistance) for 3 hours. During the test, the generator performance should meet the requirements of Table 4. After the test chamber is completed, wait for the product to cool to ambient temperature and check the cold state performance according to 4.9. Table 4
Standard voltage
5.2.12 Wet heat test
When the work is transferred, each circuit (phase) end uses 1
Perform according to 4.11 of JB/66971993. After the test, place it under the test conditions specified in 4.3 for 1-2 hours, and check the cold performance according to 4.9: wet heat type products should be checked again according to 4.18. .23 Protection level inspection
Generator protection level inspection method is carried out according to the provisions of GB 442.1. 5.2.14 Interchangeability test
After three products of the same model are opened, their parts are mixed and then combined: when disassembling, check the internal assembly quality of the product and the protection treatment quality of the internal parts; after installation, check the product performance, which should still meet the requirements of 4.9. 9.2.15 Durability test The generator durability test may be conducted by one of the following methods. [High humidity and high speed test is preferred. 5.2.[5.1 High temperature and high speed test] The generator is installed in the test bench. According to the specified frequency and load, the temperature and speed are controlled according to the test conditions specified in Table 5. The test is conducted until the specified time. Motor type Pulley type Flywheel type Flywheel type Wind turbine type 5.2.15.2 General durability test Test range JB/T9844-1999 Test speed 3 000rpm or less is 2 times the rated speed: 4 000h/min 1.5 Times
rated speed
test timeh
Install the generator on a special acid test bench at actual temperature. The generator works at the rated speed and rated load. The estimated working time should be 3 000h
During the whole test, the lubricant is allowed to be replaced once and the test is allowed to be interrupted, but the continuous working time each time shall not be less than 4 hours. 5.2.16 Salt dew test
The test method is in accordance with 4.12 of 1R/T6697-1993. The test duration is 16h. The test piece generator is placed under the test conditions specified in 4.3 for 1-2h, and the cold performance is checked according to 4.9. 5.3、17 days of test
The test method shall be carried out in accordance with the provisions of D/6697-1993 4.15. After 28 days of test, the ± products in the test box shall be immediately taken out for external inspection
6 Inspection and testing
6.1 Each generator must be inspected and qualified before it can be shipped out of the factory, and it shall be accompanied by documents or marks proving the quality of the product. 2 The test types of generators are divided into factory tests and type tests. 6.3 The factory test items of generators are as follows:
) Appearance and installation quality and inspection;
b) Installation and external dimensions inspection;
) Cold working performance test
d) Withstand voltage test.
6.4 The user has the right to accept the product in accordance with the provisions of 0B/T2828. This standard adopts: 1) Inspection level: 2) Qualified quality level: AQL=0.4~6.5; 3) Sampling plan: One-time routine inspection plan. The AQI, value, batch and acceptance items of the product shall be agreed upon by the manufacturer and the user. 6.5 Type test
6.5.1 Manufacturing! Type test should be conducted in one of the following situations: a) when new products are put into production and old products are transferred to the factory for finalization and appraisal; b) after formal production, if there are major changes in structure, materials, and design that may affect product performance: c) when the product is discontinued for more than one year and resumed production: JB/T9844—1999
c) when the factory test results are significantly different from the last type or inspection results: 6.5.2 Type test items include all test items listed in the standard, and each test should be conducted as soon as possible. 6.5.3 The generators for type test shall be selected from the same batch of qualified products or products, with a number of not less than 5 units, and divided into one or two groups. One group is 2 sets for long-term testing (for damp and hot products, samples should be taken from outside for mildew growth test, and the number of days should not be less than 2 pieces), and the evaluation is in accordance with the provisions of 5.4 of JB/T6697.
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7.1 Each generator should have a fixed sign or printed sign in a conspicuous position, and the content is as follows:
b) manufacturer's address and trademark address;
c) product name and model;
d) nominal power and power;
7.2 Packaging
.1.1 The packaging should take into account the relevant requirements of anti-flow, anti-dust, and transportation and loading and unloading; t.2.2 Before packaging, the parts of the black metal parts of the product should be protected from light, and temporary corresponding anti-rust measures should be taken. 7.2.3 The packing box should be of good quality. The product should not move easily in the box to avoid damage during transportation. The spare parts accompanying the product should be packed in the same box. The gross weight of each box after packing should not exceed 50kg. 7.2.4 The words and signs on the label of each packing box should include the following: a) Name and address of the shipping unit: b) Product name, model and effective number: d) Name of the shipping unit: d) Words and signs of transportation operation, gross weight of each box of products and other signs. Such as: "Be careful", "Do not invert", "Prevent damage", "Moisture-proof" and other words and signs. 7.3 The technical documents supplied with the product include: a) Packing list; b) Product inspection certificate: d) Maintenance instructions: d) Warranty card.
4 The product shall not be subjected to corrosion, heavy pressure, delay, acid, etc. and organic droplets during storage and transportation. A1 Equivalent resistance value (including special line resistance) Equivalent resistance value see Table A1.
Motion rate W
JE/T 9844—1999
Appendix A
(accurate resistance test)
Test resistance requirements
Equivalent resistance difference
Low. Working. Working. Reverse
2.4 (2.5)
1.T (1.8)
Standard: L. Working speed
2.8 (2.9)
1.9 (2.0)
Standard 1 Working reverse
2.1 (2.2)
Code: For flying type strong motors, the choice of bracketed or non-bracketed conduction shall be determined by the corresponding set of voltage values selected in Table 2 of this standard. A2 The material shall be copper alloy [copper] or spider alloy wire with a diameter of not less than 1mml. A3 The resistor shall be a non-inductive resistor.TGG97-19931.7 regulations
5. 2.7 Overspeed test
JB/T9844-1999
Under the condition of no load, control the speed according to 4.11 military requirements to the specified time. After the test, wait for the generator to cool to the ambient temperature and control the cold state performance according to 4.9.
5.2.# Vibration or shock test
Under the non-working state, the generator shall be carried out according to 4.7 of JB/T6697-1993. After each test, check the cold state performance according to 4.9. 5. 2. 9 Temperature test
The generator shall run continuously at the rated working speed and rated load until the temperature rise is stable. Check the temperature rise of the generator winding. The temperature rise measurement and calculation shall be carried out according to 4.4 of JB/T6697-1993. 5.2.10 Temperature change test
Put the product directly into the table! Put the product in the specified low temperature box for 2 hours, take it out and place it at room temperature for 2-3 minutes (if using automatic two-box equipment, it can be less than 305, and it does not need to be placed at room temperature for 2 days). Then put the product in the high temperature box for 2 hours, take it out and place it at room temperature for 2~3 minutes. The above test is one cycle, and a total of 5 cycles are tested. After the low temperature test of the last cycle is over, take out the generator and check the working performance of the motor during the time of placing it at room temperature. It is required that the generator can generate electricity at the three specified speeds.
After all temperature change tests are completed, wait for the product to cool to ambient temperature and check the cold state performance according to 4.9. 5.2.11 High temperature test
Put the generator in a high temperature box with some air conditioning equipment, and start to heat up to the high temperature position specified in Table 1. The generator works at a specified operating speed and rated load (can be replaced by a resistor of equivalent resistance) for 3 hours. During the test, the generator performance should meet the requirements of Table 4. After the test chamber is completed, wait for the product to cool to ambient temperature and check the cold state performance according to 4.9. Table 4
Standard voltage
5.2.12 Wet heat test
When the work is transferred, each circuit (phase) end uses 1
Perform according to 4.11 of JB/66971993. After the test, place it under the test conditions specified in 4.3 for 1-2 hours, and check the cold performance according to 4.9: wet heat type products should be checked again according to 4.18. .23 Protection level inspection
Generator protection level inspection method is carried out according to the provisions of GB 442.1. 5.2.14 Interchangeability test
After three products of the same model are opened, their parts are mixed and then combined: when disassembling, check the internal assembly quality of the product and the protection treatment quality of the internal parts; after installation, check the product performance, which should still meet the requirements of 4.9. 9.2.15 Durability test The generator durability test may be conducted by one of the following methods. [High humidity and high speed test is preferred. 5.2.[5.1 High temperature and high speed test] The generator is installed in the test bench. According to the specified frequency and load, the temperature and speed are controlled according to the test conditions specified in Table 5. The test is conducted until the specified time. Motor type Pulley type Flywheel type Flywheel type Wind turbine type 5.2.15.2 General durability test Test range JB/T9844-1999 Test speed 3 000rpm or less is 2 times the rated speed: 4 000h/min 1.5 Times
rated speed
test timeh
Install the generator on a special acid test bench at actual temperature. The generator works at the rated speed and rated load. The estimated working time should be 3 000h
During the whole test, the lubricant is allowed to be replaced once and the test is allowed to be interrupted, but the continuous working time each time shall not be less than 4 hours. 5.2.16 Salt dew test
The test method is in accordance with 4.12 of 1R/T6697-1993. The test duration is 16h. The test piece generator is placed under the test conditions specified in 4.3 for 1-2h, and the cold performance is checked according to 4.9. 5.3、17 days of test
The test method shall be carried out in accordance with the provisions of D/6697-1993 4.15. After 28 days of test, the ± products in the test box shall be immediately taken out for external inspection
6 Inspection and testing
6.1 Each generator must be inspected and qualified before it can be shipped out of the factory, and it shall be accompanied by documents or marks proving the quality of the product. 2 The test types of generators are divided into factory tests and type tests. 6.3 The factory test items of generators are as follows:
) Appearance and installation quality and inspection;
b) Installation and external dimensions inspection;
) Cold working performance test
d) Withstand voltage test.
6.4 The user has the right to accept the product in accordance with the provisions of 0B/T2828. This standard adopts: 1) Inspection level: 2) Qualified quality level: AQL=0.4~6.5; 3) Sampling plan: One-time routine inspection plan. The AQI, value, batch and acceptance items of the product shall be agreed upon by the manufacturer and the user. 6.5 Type test
6.5.1 Manufacturing! Type test should be conducted in one of the following situations: a) when new products are put into production and old products are transferred to the factory for finalization and appraisal; b) after formal production, if there are major changes in structure, materials, and design that may affect product performance: c) when the product is discontinued for more than one year and resumed production: JB/T9844—1999
c) when the factory test results are significantly different from the last type or inspection results: 6.5.2 Type test items include all test items listed in the standard, and each test should be conducted as soon as possible. 6.5.3 The generators for type test shall be selected from the same batch of qualified products or products, with a number of not less than 5 units, and divided into one or two groups. One group is 2 sets for long-term testing (for damp and hot products, samples should be taken from outside for mildew growth test, and the number of days should not be less than 2 pieces), and the evaluation is in accordance with the provisions of 5.4 of JB/T6697.
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7.1 Each generator should have a fixed sign or printed sign in a conspicuous position, and the content is as follows:
b) manufacturer's address and trademark address;
c) product name and model;
d) nominal power and power;
7.2 Packaging
.1.1 The packaging should take into account the relevant requirements of anti-flow, anti-dust, and transportation and loading and unloading; t.2.2 Before packaging, the parts of the black metal parts of the product should be protected from light, and temporary corresponding anti-rust measures should be taken. 7.2.3 The packing box should be of good quality. The product should not move easily in the box to avoid damage during transportation. The spare parts accompanying the product should be packed in the same box. The gross weight of each box after packing should not exceed 50kg. 7.2.4 The words and signs on the label of each packing box should include the following: a) Name and address of the shipping unit: b) Product name, model and effective number: d) Name of the shipping unit: d) Words and signs of transportation operation, gross weight of each box of products and other signs. Such as: "Be careful", "Do not invert", "Prevent damage", "Moisture-proof" and other words and signs. 7.3 The technical documents supplied with the product include: a) Packing list; b) Product inspection certificate: d) Maintenance instructions: d) Warranty card.
4 The product shall not be subjected to corrosion, heavy pressure, delay, acid, etc. and organic droplets during storage and transportation. A1 Equivalent resistance value (including special line resistance) Equivalent resistance value see Table A1.
Motion rate W
JE/T 9844—1999
Appendix A
(accurate resistance test)
Test resistance requirements
Equivalent resistance difference
Low. Working. Working. Reverse
2.4 (2.5)
1.T (1.8)
Standard: L. Working speed
2.8 (2.9)
1.9 (2.0)
Standard 1 Working reverse
2.1 (2.2)
Code: For flying type strong motors, the choice of bracketed or non-bracketed conduction shall be determined by the corresponding set of voltage values selected in Table 2 of this standard. A2 The material shall be copper alloy [copper] or spider alloy wire with a diameter of not less than 1mml. A3 The resistor shall be a non-inductive resistor.#Vibration or shock test
The generator is not working according to the provisions of 4.7 of JB/T6697-1993. After each test, check the cooling performance in 4.9. 5.2.9 Temperature test
The generator is continuously operated at the rated working speed and rated load until the temperature rise is stable. Check the temperature rise of the generator winding. The temperature rise measurement and calculation are carried out according to the provisions of 4.4 of JB/T6697-1993. 5.2.10 Temperature change test
Put the product directly in the low temperature box specified in the table for 2 hours, take it out and place it at room temperature for 2-3 minutes (if using automatic two-box equipment, it can be less than 305, and it does not need to be placed at room temperature for a day). Then put the product in the high temperature box for 2 hours, take it out and place it at room temperature for 2~3 minutes. The above test is one cycle, and a total of 5 cycles are tested. After the low temperature measurement, take out the generator and check the working performance of the motor during the time it is placed at room temperature. The generator is required to generate electricity at the three specified speeds.
After all temperature change tests are completed, wait for the product to cool to ambient temperature and check the cold state performance according to 4.9. 5.2.11 High temperature test
Put the generator in a high temperature box with some air conditioning equipment, and heat it to the high temperature level specified in Table 1. The generator works for 3 hours at a certain operating speed and rated load (equivalent resistance can be used instead). During the test, the generator performance should meet the requirements of Table 4. After the test chamber is completed, wait for the product to cool to ambient temperature and check the cold state performance according to 4.9. Table 4
Standard voltage
5.2.12 Wet heat test
When working at a certain temperature, each circuit (phase) terminal is charged with 1
Perform according to 4.11 of JB/66971993. After the test, place it under the test conditions specified in 4.3 for 1-2 hours, and check the cold state performance according to 4.9: Wet heat type products should be checked again according to 4.18. .23 Protection level inspection
The protection level inspection method for generators shall be carried out in accordance with the provisions of 442.1 of GB 442.1. 5.2.14 Interchangeability test
After disassembling three products of the same model, mix their parts and then check the internal assembly quality of the product and the protection treatment quality of the internal parts; after installation, check the product performance, which should still meet the provisions of 4.9. 9.2.15 Durability
The durability test of the generator can be carried out by one of the following methods, preferably high humidity and high speed test. 5.2.15.2 High temperature and high speed test [Strengthening] The generator is installed in the test bench, and the temperature and speed are controlled according to the test conditions specified in Table 5 according to the specified frequency and load. The test is carried out until the specified time. Motor type Pulley type Flywheel type Friction wheel type Wind turbine 5.2.15.2 General endurance test Test range JB/T9844—1999 Test speed 3 000rmim or less is 2 times the rated speed: 4 000h/in 1: 1.5 Times
rated speed
test timeh
Install the generator on a special acid test bench at actual temperature. The generator works at the rated speed and rated load. The estimated working time should be 3 000h
During the whole test, the lubricant is allowed to be replaced once and the test is allowed to be interrupted, but the continuous working time each time shall not be less than 4 hours. 5.2.16 Salt dew test
The test method is in accordance with 4.12 of 1R/T6697-1993. The test duration is 16h. The test piece generator is placed under the test conditions specified in 4.3 for 1-2h, and the cold performance is checked according to 4.9. 5.3、17 days of test
The test method shall be carried out in accordance with the provisions of D/6697-1993 4.15. After 28 days of test, the ± products in the test box shall be immediately taken out for external inspection
6 Inspection and testing
6.1 Each generator must be inspected and qualified before it can be shipped out of the factory, and it shall be accompanied by documents or marks proving the quality of the product. 2 The test types of generators are divided into factory tests and type tests. 6.3 The factory test items of generators are as follows:
) Appearance and installation quality and inspection;
b) Installation and external dimensions inspection;
) Cold working performance test
d) Withstand voltage test.
6.4 The user has the right to accept the product in accordance with the provisions of 0B/T2828. This standard adopts: 1) Inspection level: 2) Qualified quality level: AQL=0.4~6.5; 3) Sampling plan: One-time routine inspection plan. The AQI, value, batch and acceptance items of the product shall be agreed upon by the manufacturer and the user. 6.5 Type test
6.5.1 Manufacturing! Type test should be conducted in one of the following situations: a) when new products are put into production and old products are transferred to the factory for finalization and appraisal; b) after formal production, if there are major changes in structure, materials, and design that may affect product performance: c) when the product is discontinued for more than one year and resumed production: JB/T9844—1999
c) when the factory test results are significantly different from the last type or inspection results: 6.5.2 Type test items include all test items listed in the standard, and each test should be conducted as soon as possible. 6.5.3 The generators for type test shall be selected from the same batch of qualified products or products, with a number of not less than 5 units, and divided into one or two groups. One group is 2 sets for long-term testing (for damp and hot products, samples should be taken from outside for mildew growth test, and the number of days should not be less than 2 pieces), and the evaluation is in accordance with the provisions of 5.4 of JB/T6697.
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7.1 Each generator should have a fixed sign or printed sign in a conspicuous position, and the content is as follows:
b) manufacturer's address and trademark address;
c) product name and model;
d) nominal power and power;
7.2 Packaging
.1.1 The packaging should take into account the relevant requirements of anti-flow, anti-dust, and transportation and loading and unloading; t.2.2 Before packaging, the parts of the black metal parts of the product should be protected from light, and temporary corresponding anti-rust measures should be taken. 7.2.3 The packing box should be of good quality. The product should not move easily in the box to avoid damage during transportation. The spare parts accompanying the product should be packed in the same box. The gross weight of each box after packing should not exceed 50kg. 7.2.4 The words and signs on the label of each packing box should include the following: a) Name and address of the shipping unit: b) Product name, model and effective number: d) Name of the shipping unit: d) Words and signs of transportation operation, gross weight of each box of products and other signs. Such as: "Be careful", "Do not invert", "Prevent damage", "Moisture-proof" and other words and signs. 7.3 The technical documents supplied with the product include: a) Packing list; b) Product inspection certificate: d) Maintenance instructions: d) Warranty card.
4 The product shall not be subjected to corrosion, heavy pressure, delay, acid, etc. and organic droplets during storage and transportation. A1 Equivalent resistance value (including special line resistance) Equivalent resistance value see Table A1.
Motion rate W
JE/T 9844—1999
Appendix A
(accurate resistance test)
Test resistance requirements
Equivalent resistance difference
Low. Working. Working. Reverse
2.4 (2.5)
1.T (1.8)
Standard: L. Working speed
2.8 (2.9)
1.9 (2.0)
Standard 1 Working reverse
2.1 (2.2)
Code: For flying type strong motors, the choice of bracketed or non-bracketed conduction shall be determined by the corresponding set of voltage values selected in Table 2 of this standard. A2 The material shall be copper alloy [copper] or spider alloy wire with a diameter of not less than 1mml. A3 The resistor shall be a non-inductive resistor.#Vibration or shock test
The generator is not working according to the provisions of 4.7 of JB/T6697-1993. After each test, check the cooling performance in 4.9. 5.2.9 Temperature test
The generator is continuously operated at the rated working speed and rated load until the temperature rise is stable. Check the temperature rise of the generator winding. The temperature rise measurement and calculation are carried out according to the provisions of 4.4 of JB/T6697-1993. 5.2.10 Temperature change test
Put the product directly in the low temperature box specified in the table for 2 hours, take it out and place it at room temperature for 2-3 minutes (if using automatic two-box equipment, it can be less than 305, and it does not need to be placed at room temperature for a day). Then put the product in the high temperature box for 2 hours, take it out and place it at room temperature for 2~3 minutes. The above test is one cycle, and a total of 5 cycles are tested. After the low temperature measurement, take out the generator and check the working performance of the motor during the time it is placed at room temperature. The generator is required to generate electricity at the three specified speeds.
After all temperature change tests are completed, wait for the product to cool to ambient temperature and check the cold state performance according to 4.9. 5.2.11 High temperature test
Put the generator in a high temperature box with some air conditioning equipment, and heat it to the high temperature level specified in Table 1. The generator works for 3 hours at a certain operating speed and rated load (equivalent resistance can be used instead). During the test, the generator performance should meet the requirements of Table 4. After the test chamber is completed, wait for the product to cool to ambient temperature and check the cold state performance according to 4.9. Table 4
Standard voltage
5.2.12 Wet heat test
When working at a certain temperature, each circuit (phase) terminal is charged with 1
Perform according to 4.11 of JB/66971993. After the test, place it under the test conditions specified in 4.3 for 1-2 hours, and check the cold state performance according to 4.9: Wet heat type products should be checked again according to 4.18. .23 Protection level inspection
The protection level inspection method for generators shall be carried out in accordance with the provisions of 442.1 of GB 442.1. 5.2.14 Interchangeability test
After disassembling three products of the same model, mix their parts and then check the internal assembly quality of the product and the protection treatment quality of the internal parts; after installation, check the product performance, which should still meet the provisions of 4.9. 9.2.15 Durability
The durability test of the generator can be carried out by one of the following methods, preferably high humidity and high speed test. 5.2.15.2 High temperature and high speed test [Strengthening] The generator is installed in the test bench, and the temperature and speed are controlled according to the test conditions specified in Table 5 according to the specified frequency and load. The test is carried out until the specified time. Motor type Pulley type Flywheel type Friction wheel type Wind turbine 5.2.15.2 General endurance test Test range JB/T9844—1999 Test speed 3 000rmim or less is 2 times the rated speed: 4 000h/in 1: 1.5 Times
rated speed
test timeh
Install the generator on a special acid test bench at actual temperature. The generator works at the rated speed and rated load. The estimated working time should be 3 000h
During the whole test, the lubricant is allowed to be replaced once and the test is allowed to be interrupted, but the continuous working time each time shall not be less than 4 hours. 5.2.16 Salt dew test
The test method is in accordance with 4.12 of 1R/T6697-1993. The test duration is 16h. The test piece generator is placed under the test conditions specified in 4.3 for 1-2h, and the cold performance is checked according to 4.9. 5.3、17 days of test
The test method shall be carried out in accordance with the provisions of D/6697-1993 4.15. After 28 days of test, the ± products in the test box shall be immediately taken out for external inspection
6 Inspection and testing
6.1 Each generator must be inspected and qualified before it can be shipped out of the factory, and it shall be accompanied by documents or marks proving the quality of the product. 2 The test types of generators are divided into factory tests and type tests. 6.3 The factory test items of generators are as follows:
) Appearance and installation quality and inspection;
b) Installation and external dimensions inspection;
) Cold working performance test
d) Withstand voltage test.
6.4 The user has the right to accept the product in accordance with the provisions of 0B/T2828. This standard adopts: 1) Inspection level: 2) Qualified quality level: AQL=0.4~6.5; 3) Sampling plan: One-time routine inspection plan. The AQI, value, batch and acceptance items of the product shall be agreed upon by the manufacturer and the user. 6.5 Type test
6.5.1 Manufacturing! Type test should be conducted in one of the following situations: a) when new products are put into production and old products are transferred to the factory for finalization and appraisal; b) after formal production, if there are major changes in structure, materials, and design that may affect product performance: c) when the product is discontinued for more than one year and resumed production: JB/T9844—1999
c) when the factory test results are significantly different from the last type or inspection results: 6.5.2 Type test items include all test items listed in the standard, and each test should be conducted as soon as possible. 6.5.3 The generators for type test shall be selected from the same batch of qualified products or products, with a number of not less than 5 units, and divided into one or two groups. One group is 2 sets for long-term testing (for damp and hot products, samples should be taken from outside for mildew growth test, and the number of days should not be less than 2 pieces), and the evaluation is in accordance with the provisions of 5.4 of JB/T6697.
?
7.1 Each generator should have a fixed sign or printed sign in a conspicuous position, and the content is as follows:
b) manufacturer's address and trademark address;
c) product name and model;
d) nominal power and power;
7.2 Packaging
.1.1 The packaging should take into account the relevant requirements of anti-flow, anti-dust, and transportation and loading and unloading; t.2.2 Before packaging, the parts of the black metal parts of the product should be protected from light, and temporary corresponding anti-rust measures should be taken. 7.2.3 The packing box should be of good quality. The product should not move easily in the box to avoid damage during transportation. The spare parts accompanying the product should be packed in the same box. The gross weight of each box after packing should not exceed 50kg. 7.2.4 The words and signs on the label of each packing box should include the following: a) Name and address of the shipping unit: b) Product name, model and effective number: d) Name of the shipping unit: d) Words and signs of transportation operation, gross weight of each box of products and other signs. Such as: "Be careful", "Do not invert", "Prevent damage", "Moisture-proof" and other words and signs. 7.3 The technical documents supplied with the product include: a) Packing list; b) Product inspection certificate: d) Maintenance instructions: d) Warranty card.
4 The product shall not be subjected to corrosion, heavy pressure, delay, acid, etc. and organic droplets during storage and transportation. A1 Equivalent resistance value (including special line resistance) Equivalent resistance value see Table A1.
Motion rate W
JE/T 9844—1999
Appendix A
(accurate resistance test)
Test resistance requirements
Equivalent resistance difference
Low. Working. Working. Reverse
2.4 (2.5)
1.T (1.8)
Standard: L. Working speed
2.8 (2.9)
1.9 (2.0)
Standard 1 Working reverse
2.1 (2.2)
Code: For flying type strong motors, the choice of bracketed or non-bracketed conduction shall be determined by the corresponding set of voltage values selected in Table 2 of this standard. A2 The material shall be copper alloy [copper] or spider alloy wire with a diameter of not less than 1mml. A3 The resistor shall be a non-inductive resistor.10 Temperature change test
Put the product directly into the low temperature box specified in the table for 2 hours, take it out and place it at room temperature for 2-3 minutes (if using automatic two-box equipment, it can be less than 305, and it does not need to be placed at room temperature for a day). Then put the product into the high temperature box for 2 hours, and then take it out and place it at room temperature for 2~3 minutes. The above test is one cycle, and a total of 5 cycles are tested. After the low temperature test of the last cycle is over, take out the generator, and check the working performance of the motor during the time of placing it at room temperature. The generator is required to generate electricity at the three specified speeds.
After all temperature change tests are completed, wait for the product to cool to the ambient temperature and check the cold state performance according to 4.9. 5.2.11 High temperature test
Put the generator into a high temperature box with some air conditioning equipment, and start to heat up to the high temperature position specified in the table. The generator works for 3 hours at a specified operating speed and rated load (which can be replaced by a resistor of equivalent resistance). During the test, the generator performance should meet the requirements of Table 4. After the test chamber is finished, wait for the product to cool to the ambient temperature and check the cold state performance according to 4.9. Table 4
Standard voltage
5.2.12 Wet heat test
When the work is transferred to the specified working state, each circuit (phase) terminal uses 1
Perform according to 4.11 of JB/66971993. After the test, place it under the test conditions specified in 4.3 for 1-2 hours, and check the cold state performance according to 4.9: Wet heat type products should be checked again according to 4.18. .23 Protection level inspection
Generator protection level inspection method shall be carried out according to the provisions of GB 442.1. 5.2.14 Interchangeability test
After 3 products of the same model are opened, their parts are mixed and then combined: when disassembling, check the internal assembly quality of the product and the protection treatment quality of the internal parts; after installation, check the product performance, which should still meet the requirements of 4.9. 9.2.15 Durability test The generator durability test may be conducted by one of the following methods. [High humidity and high speed test is preferred. 5.2.[5.1 High temperature and high speed test] The generator is installed in the test bench. According to the specified frequency and load, the temperature and speed are controlled according to the test conditions specified in Table 5. The test is conducted until the specified time. Motor type Pulley type Flywheel type Flywheel type Wind turbine type 5.2.15.2 General durability test Test range JB/T9844-1999 Test speed 3 000rpm or less is 2 times the rated speed: 4 000h/min 1.5 Times
rated speed
test timeh
Install the generator on a special acid test bench at actual temperature. The generator works at the rated speed and rated load. The estimated working time should be 3 000h
During the whole test, the lubricant is allowed to be replaced once and the test is allowed to be interrupted, but the continuous working time each time shall not be less than 4 hours. 5.2.16 Salt dew test
The test method is in accordance with 4.12 of 1R/T6697-1993. The test duration is 16h. The test piece generator is placed under the test conditions specified in 4.3 for 1-2h, and the cold performance is checked according to 4.9. 5.3、17 days of test
The test method shall be carried out in accordance with the provisions of D/6697-1993 4.15. After 28 days of test, the ± products in the test box shall be immediately taken out for external inspection
6 Inspection and testing
6.1 Each generator must be inspected and qualified before it can be shipped out of the factory, and it shall be accompanied by documents or marks proving the quality of the product. 2 The test types of generators are divided into factory tests and type tests. 6.3 The factory test items of generators are as follows:
) Appearance and installation quality and inspection;
b) Installation and external dimensions inspection;
) Cold working performance test
d) Withstand voltage test.
6.4 The user has the right to accept the product in accordance with the provisions of 0B/T2828. This standard adopts: 1) Inspection level: 2) Qualified quality level: AQL=0.4~6.5; 3) Sampling plan: One-time routine inspection plan. The AQI, value, batch and acceptance items of the product shall be agreed upon by the manufacturer and the user. 6.5 Type test
6.5.1 Manufacturing! Type test should be conducted in one of the following situations: a) when new products are put into production and old products are transferred to the factory for finalization and appraisal; b) after formal production, if there are major changes in structure, materials, and design that may affect product performance: c) when the product is discontinued for more than one year and resumed production: JB/T9844—1999
c) when the factory test results are significantly different from the last type or inspection results: 6.5.2 Type test items include all test items listed in the standard, and each test should be conducted as soon as possible. 6.5.3 The generators for type test shall be selected from the same batch of qualified products or products, with a number of not less than 5 units, and divided into one or two groups. One group is 2 sets for long-term testing (for damp and hot products, samples should be taken from outside for mildew growth test, and the number of days should not be less than 2 pieces), and the evaluation is in accordance with the provisions of 5.4 of JB/T6697.
?
7.1 Each generator should have a fixed sign or printed sign in a conspicuous position, and the content is as follows:
b) manufacturer's address and trademark address;
c) product name and model;
d) nominal power and power;
7.2 Packaging
.1.1 The packaging should take into account the relevant requirements of anti-flow, anti-dust, and transportation and loading and unloading; t.2.2 Before packaging, the parts of the black metal parts of the product should be protected from light, and temporary corresponding anti-rust measures should be taken. 7.2.3 The packing box should be of good quality. The product should not move easily in the box to avoid damage during transportation. The spare parts accompanying the product should be packed in the same box. The gross weight of each box after packing should not exceed 50kg. 7.2.4 The words and signs on the label of each packing box should include the following: a) Name and address of the shipping unit: b) Product name, model and effective number: d) Name of the shipping unit: d) Words and signs of transportation operation, gross weight of each box of products and other signs. Such as: "Be careful", "Do not invert", "Prevent damage", "Moisture-proof" and other words and signs. 7.3 The technical documents supplied with the product include: a) Packing list; b) Product inspection certificate: d) Maintenance instructions: d) Warranty card.
4 The product shall not be subjected to corrosion, heavy pressure, delay, acid, etc. and organic droplets during storage and transportation. A1 Equivalent resistance value (including special line resistance) Equivalent resistance value see Table A1.
Motion rate W
JE/T 9844—1999
Appendix A
(accurate resistance test)
Test resistance requirements
Equivalent resistance difference
Low. Working. Working. Reverse
2.4 (2.5)
1.T (1.8)
Standard: L. Working speed
2.8 (2.9)
1.9 (2.0)
Standard 1 Working reverse
2.1 (2.2)
Code: For flying type strong motors, the choice of bracketed or non-bracketed conduction shall be determined by the corresponding set of voltage values selected in Table 2 of this standard. A2 The material shall be copper alloy [copper] or spider alloy wire with a diameter of not less than 1mml. A3 The resistor shall be a non-inductive resistor.10 Temperature change test
Put the product directly into the low temperature box specified in the table for 2 hours, take it out and place it at room temperature for 2-3 minutes (if using automatic two-box equipment, it can be less than 305, and it does not need to be placed at room temperature for a day). Then put the product into the high temperature box for 2 hours, and then take it out and place it at room temperature for 2~3 minutes. The above test is one cycle, and a total of 5 cycles are tested. After the low temperature test of the last cycle is over, take out the generator, and check the working performance of the motor during the time of placing it at room temperature. The generator is required to generate electricity at the three specified speeds.
After all temperature change tests are completed, wait for the product to cool to the ambient temperature and check the cold state performance according to 4.9. 5.2.11 High temperature test
Put the generator into a high temperature box with some air conditioning equipment, and start to heat up to the high temperature position specified in the table. The generator works for 3 hours at a specified operating speed and rated load (which can be replaced by a resistor of equivalent resistance). During the test, the generator performance should meet the requirements of Table 4. After the test chamber is finished, wait for the product to cool to the ambient temperature and check the cold state performance according to 4.9. Table 4
Standard voltage
5.2.12 Wet heat test
When the work is transferred to the specified working state, each circuit (phase) terminal uses 1
Perform according to 4.11 of JB/66971993. After the test, place it under the test conditions specified in 4.3 for 1-2 hours, and check the cold state performance according to 4.9: Wet heat type products should be checked again according to 4.18. .23 Protection level inspection
Generator protection level inspection method shall be carried out according to the provisions of GB 442.1. 5.2.14 Interchangeability testbzxz.net
After 3 products of the same model are opened, their parts are mixed and then combined: when disassembling, check the internal assembly quality of the product and the protection treatment quality of the internal parts; after installation, check the product performance, which should still me
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