GB 4706.17-1996 Special requirements for safety motors-compressors for household and similar electrical appliances
Some standard content:
GB4706.17-1996 | This standard adopts IEC Publication 335-2-34 (1980) "Safety of Household and Similar Electrical Appliances Part 2: Special Requirements for Motors and Compressors" and its first amendment (1987) and second amendment (1991). ) and the Third Amendment (1992). The following fonts are used in this standard:
Printed font for technical requirements and test specifications: - Use small print for notes.
This standard is proposed by China Light Industry Federation.
This standard is under the jurisdiction of the National Technical Committee for Standardization of Household Electrical Appliances. This standard is drafted by China Household Electrical Appliances Research Institute and Guangzhou Daily Electrical Appliances Research Institute. The main drafters of this standard are: Zhao Jiarui, Liu, Duan Yansheng, Li Huizhong, Huang Binggeng, Wu Minhua, Guan Mingtong, Zhou Youxin, Lin De, Su Huancheng, Peng Huilan, Wu Zhongguo.
GB4706.17-1996
IEC Foreword
This publication is sponsored by IEC (International Electrotechnical Commission) Technical Committee 61 (Safety of household and similar electrical appliances), Division 61C Drafted by Technical Committee (Household Appliances for Refrigeration). The first draft of this publication was discussed at the Copenhagen Conference in October 1976, and a new draft was compiled based on the results of the discussion, namely Documents 61C (Central Office) 9, 61C (Central Office) 9A, 61C ( Central Office) 9B, submitted to the National Committee for a June Law vote in February 1978, a revised draft, Document 61C (Central Office) 11, was considered by the Editorial Working Group and carried out in May 1979 as a "February Law" " Vote. The National Committees of the following countries voted expressly in favor of this publication. Australia
Austria
Belgium
Czechoslovakia
Canada
Denmark| |tt||Egypt
Finland
France
Germany
Hungary
Israel
Italy
Japan||tt ||Holland
Land
wave
South Africa
Sweden
Switzerland
Turkey
Soviet Union
United Kingdom | Lists the changes necessary to make this publication an IEC standard; Motor-Compressor Safety Requirements (First Edition). The purpose of this standard is to establish the safety requirements for enclosed (including fully enclosed and semi-enclosed) electric motors and compressors. Special safety requirements to avoid repeated testing of the same compressor in different types and types of refrigeration and air-conditioning installations Test items carried out in accordance with this standard are optional and do not require pre-treatment like appliance testing, e.g. Chapter 24 of the relevant special requirements standard. However, if the appliance is equipped with a motor-compressor that complies with this standard, the test items of the appliance may be reduced to a reasonable extent. Sealed (fully enclosed and semi-enclosed) motor-compressors and their accompanying starting and protection systems that are tested separately under the most severe conditions
especially structural inspection, stall test, overload short circuit test, etc. It can be done on a single compressor, so it is not necessary to recheck the compressor when it is used in a variety of different appliances and factory-made assemblies. Some operating tests can also be done on a single compressor in some cases. This standard provides recommendations for these type tests, but current standards related to application categories include IEC Publication 335-2-24 Part 2 "Special Requirements for Refrigerators and Food Freezers" and IEC Publication 378 "Room Air Conditioning". The tests recommended in "Safety Requirements for Electrical Devices of Appliances" need to be carried out on the final application product (i.e. the complete appliance) and used as the basis for final approval. Some countries have the following differences:
— - Required to be marked with locked-rotor current (clause 7.1); - LRA locked-rotor current (clause 7.6);
- If the power distribution system is such that a primary single-phase fault is unlikely to occur, 19.3.3.6 is not required Test of strips (Article 19.3.3.6);
GB4706.17-1996
requires higher or lower strength (Articles 21.101.1 and 21.101.2). In this publication:
1) Use the following print fonts:
—technical requirements in regular fonts;
test specifications in italics;
—notes in small fonts Traditional Chinese characters.
2) Additional clauses or figures added to the content in Part One are numbered starting from 101, and additional appendices are represented by letters AA, BB, etc. Other IEC publications referenced in this publication: IEC 85 Recommendations for the classification of insulating materials for electrical machinery and equipment according to their thermal stability in use IEC 335-2-24 Safety of household and similar electrical appliances Part 2 Refrigerators and food Special requirements for freezers IEC378 Safety requirements for electrical installations of room air conditioners 1 Scope
National Standard of the People's Republic of China
Safety of household and similar electrical appliances
Motor-compressor Special requirements
Safety of household and similar electrical appliances
Particular requirements for motor-compressors This chapter in GB4706.1 is replaced by the following content, GB4706.17--1996
idtIEC335- 2-34:1980
Replaces GB4706.17-88
1.1 This standard applies to sealed (fully enclosed and semi-enclosed) motors used in air conditioning and refrigeration devices for household and similar purposes compressor. Its household and similar use must comply with the corresponding appliance standards. This standard also applies to motor-compressors used in factory-made assemblies used to transfer heat for refrigeration, air conditioning or heating or a combination of these purposes.
This standard does not apply to motor-compressors designed specifically for industrial purposes. This standard does not take into account the special conditions of use that may be encountered when appliances equipped with motor-compressors are operated in frequently explosive atmospheres.
1.2 These requirements of this standard apply to sealed motor-compressors that are individually tested under the worst conditions that can reasonably occur in normal use.
This standard does not replace relevant appliance standards, such as GB4706.13 (IEC335-2-24) "Special Requirements for the Safety of Household and Similar Electrical Appliances Household Refrigerators and Food Freezers", GB4706.32 " Particular requirements for the safety of heat pumps, air conditioners and dehumidifiers for household and similar electrical appliances. However, if the motor-compressor model used complies with this standard, the motor-compressor tests covered by the above appliance standards do not need to be performed on the appliance or assembly. 2 Terminology
This chapter in GB4706.1 is applicable, but the following content is added: 2.2.101 Sealed motor-compressor A mechanical compressor composed of a compressor and an electric motor. The compressor and motor are enclosed in the same sealed shell without an external shaft seal, and the motor runs in a refrigerant gas environment. The casing may be permanently sealed by welding or brazing (totally hermetic compressors) or by one or more sealing components (semi-hermetic compressors). Thereafter, the term "motor-compressor" is used for both hermetic and semi-hermetic compressors.
2.2.102 Multi-rated voltage motor (dual voltage - single connection) A motor suitable for use with more than one rated voltage without the need to adjust the motor winding connections (such as 220V/240V). 2.2.103 Multi-rated voltage motor (dual-voltage-multi-connection) A motor connected to an appropriate power source by adjusting the motor winding connections, so that it is suitable for the use of motors with more than one rated voltage (such as 120V/240V).
2.2.104 Motor-Compressor Housing
State Bureau of Technical Supervision approved on 1996-12-19 for implementation on 1997-12-01
GB4706.17-1996
Installed It has a compressor and an electric motor, and is a sealed shell that withstands the pressure of the refrigerant. 2.2.105 Application Classification
For the purpose of this standard, the evaporation temperature range is divided into the following application categories: (1) Low back pressure: evaporation temperature range -35℃ (can be lower if necessary) to -15 ℃, such as: household refrigerators, food freezers and similar appliances.
(2) Medium back pressure: evaporation temperature range - 20℃ to 0℃, such as: cold drink cabinets; some types of milk refrigerators and similar appliances, (3) High back pressure: evaporation temperature range - 5 ℃ to 15℃, such as: room air conditioners, dehumidifiers, certain types of milk refrigerators, heat pumps and similar appliances.
3 General requirements
This chapter in GB4706.1 shall apply.
4 General instructions in testing
This chapter in GB4706.1 is applicable except for the following content. 4.2 Except for the annotation, this clause is replaced by the following: Except for the tests in clauses 19.3 and 21.101.4, which require separate special samples, all other tests are carried out on a delivered sample. The sample shall be able to withstand all relevant tests. The special sample to be tested in 19.3 shall be identical in all respects to the test sample except that the rotor is locked by the manufacturer, shall be filled with lubricating oil and refrigerant, and shall be equipped with overload protection devices and starting relays specified by the manufacturer. To carry out the test of 21.101.4, two samples are required according to the provisions of this article. In addition, the manufacturer or its agent shall provide the inspection agency with the following information for each motor-compressor submitted for inspection: - Type of winding insulation (e.g. synthetic insulation material, cellulose insulation or similar insulation): used The chemical name or refrigerant model of the refrigerant; if it has not been filled with oil, the model and oil filling amount of the lubricating oil used should be given; the application category.
4.3 This article is replaced by the following:
The test is conducted in the order of the chapters of this standard. Before starting the test, the compressor shall undergo the test of Article 16.4, and then be placed in the alternative refrigeration circuit and run for more than 2 hours at the rated voltage and the corresponding load conditions shown in Table 1 of Article 19.2 to determine whether the motor-compressor is in operation. Instruction status.
4.5 This article is replaced by the following:
Unless otherwise specified, all tests shall be conducted at an ambient temperature of 20°C ± 5°C. 4.13 This article does not apply.
4.18 This article is replaced by the following:
PTC (positive temperature coefficient), NTC (negative temperature coefficient) and VDR (voltage sensitive resistor type) resistors are not considered electronic components in this standard , they shall withstand all tests to which the appliance is suitable. 5 Ratings
This chapter in GB4706.1 is applicable.
6 categories
This chapter in GB4706.1 is applicable.
7 mark
This chapter in GB4706.1 is applicable except for the following content. 7.1 The following two paragraphs in this article do not apply. GB4706.17—1996
—“Rated input power (W) or (kW), (when greater than 25W), or rated current (A);”—“The electric appliance should be marked with a suitable fuse. Fuse rated current (A), the starting current requirement of the fuse used is higher than the fuse current rating marked on the appliance plate if the fuse is marked with a rated current and the fuse or fuse is a time delay. type, then this information should be included in the relevant flags "
7.2 Not applicable.
8 Protection against electric shock
This chapter in GB4706.1 is applicable except for the following content. The three items 8.2, 8.3 and 8.7 are not applicable,
9 Starting of electric appliances
This chapter in GB4706.1 is not applicable
The failure to start the motor-compressor does not constitute a safety aspect danger, if it fails to start, just verify that the motor-compressor temperature is not too high. Therefore, if the motor-compressor complies with the provisions of Chapter 19 of this standard, it is not necessary to conduct the test in Chapter 9 of GB4706.1. 10 Input power and current
This chapter in GB4706.1, not applicable
The input power test cannot be performed on the motor-compressor alone, so it must be performed on the appliance. 11 Fever
This chapter in GB4706.1 is not applicable.
For motor-compressors, this chapter in GB4796.1 has been included in Chapter 19 of this standard. 2 Appliances with electric heating elements operating under overload conditions 12
This chapter in GB4706.1 is not applicable.
For motor-compressors, this chapter in GB4706.1 has been included in Chapter 19 of this standard. 3 Electrical insulation and leakage current at operating temperature 13
This chapter in GB4706.1 is applicable except for the following content. 13.1 This article is replaced by the following:
At operating temperature, the appliance should have good electrical insulation properties and should not have excessive leakage current during normal use. Compliance with the requirements of this standard is checked by the test of Clause 13.2. Motor-compressors supplied shall be tested as specified in Clause 19.3 for three-phase appliances suitable for single-phase supply and as for single-phase appliances with three parallel-connected parts. . Except for three-phase appliances that are not suitable for single-phase power supply and require the test in Article 13.3 immediately after disconnecting the power supply, all tests in this chapter are performed with the appliance energized. 14 Suppression of radio and television interference
This chapter in GB4706.1 is applicable.
15 waterproof
This chapter in GB4706.1 is applicable.
16 Insulation resistance and electrical strength
This chapter in GB4706.1 is applicable.
17 Overload Protection
This chapter in GB4706.1 is not applicable.
18 Durability
This chapter in GB4706.1 is not applicable.
19 Abnormal operation
GB4706.17-1996
This chapter in GB4706.1 is replaced by the following content. 19.1 The structure of the motor-compressor should be able to avoid fire caused by abnormal or misoperation and mechanical damage that impairs safety or electric shock protection.
Use the tests of 19.2 and 19.3 to check whether it complies with the requirements of this standard. Through these tests, it is enough to check the starting and heating of the motor-compressor in normal use. For most hermetically sealed motor-compressors (fully hermetic and semi-hermetic), a calorimeter or a substitute refrigeration circuit can be used to simulate the actual refrigeration circuit and other Corresponding impact on motor-compressor operation (see Figure 101 for a typical circuit). By doing this, the maximum temperature of the motor can be determined. Its maximum temperature is obtained through the combination of the tested motor-compressor/overload protector.
Since changes in suction pressure, discharge pressure, return air temperature, ambient temperature and air flow above the compressor affect the motor-compressor/overload protector temperature, the maximum limit conditions of the above parameters can generally be simulated. It will be applied by a normal grade appliance, using a calorimeter or using an alternative refrigeration circuit. Those refrigerators and freezers that use oil cooling tubes in the compressor to reduce the temperature of the motor may require testing if the temperature limits required in 19.2.2 are exceeded since it is not possible to accurately simulate the effect of the oil cooler. Conducted on the actual object to which it is applied.
Since the overload protector is the temperature limiting device of the motor, determining the final trip point and measuring the temperature of the motor at this time is required to confirm the maximum limit temperature of the motor winding.
If the motor winding temperature of the compressor does not exceed the maximum limit specified in Article 19.2.2 when the compressor is tested according to the application category shown in Table 1, the compressor model is deemed to comply with the relevant standards ( Such as the requirements for motor winding temperature in GB4706.13 and GB4706.32).
19.2 Operation under continuous overload conditions
19.2.1 The motor-compressor is connected to the alternative refrigeration circuit shown in Figure 101, with a supply voltage of 1.06 times the maximum rated voltage, and in the table Operate under the corresponding conditions shown in 1 until a stable state is reached. Then, with a minimum rated voltage of 0.Repeat this test for 94 times the supply voltage. Table 1 Alternative refrigeration circuit conditions for operation under continuous overload conditions Application category
Low back pressure
Medium back pressure
High back pressure
Evaporation temperature
c
-15
0
+12
Condensation temperature
℃
+65
+65|| tt||+65
Air flow above motor-compressor should be at typical normal use ambient temperature
℃
+43
+43||tt| |+43
Some motor-compressors may require a secondary refrigerant oil cooler as recommended by the manufacturer, return air temperature
c
+43
+25
+25
The evaporation temperature and condensation temperature relate to the corresponding saturated vapor pressure of the refrigerant used, and its saturated vapor pressure is measured with the suction and exhaust pressure gauge in Figure 101.
GB4706.17—1996
The return air temperature is measured with a thermocouple or similar device. The thermocouple is placed in the return air pipe as shown in Figure 101. During the test, the temperature rise is measured, and its The temperature rise should not exceed the temperature rise limit value given in the table in Article 11.8 of GB4706.1 minus 7K. The overload protector should not operate. 19.2.2 Final tripping test
After the test of 19.2.1, the following test shall be carried out immediately to produce an overload trip. During the entire test, the temperature of motor windings with synthetic insulation shall not exceed 160°C, and the temperature of motor windings with cellulose insulation or similar insulation shall not exceed 150°C. The motor-compressor shall operate according to the conditions specified in Article 19.2.1 and the power supply voltage is 0.85 times the minimum rated voltage until the overload protector trips or a stable state occurs. When the supply voltage is 1.1 times the maximum rated voltage, the test is repeated until the overload protector trips or a steady state occurs. If the overload protector does not operate in the previous tests, take the worst one of 0.85 times the minimum rated voltage and 1.1 times the maximum rated voltage, and gradually increase the condensation temperature, but its maximum limit is 76°C until the overload protector Trip or steady state occurs. If the overload protector does not trip, the test continues, and thermal insulation is gradually applied to the motor-compressor until the overload protector trips. The two values ????of 160°C and 150°C are selected, taking into account GB4706.13 and GB4706 .32 stipulates the maximum temperature limit for fully enclosed motor-compressor windings; under abnormal operating conditions, the overload protector should operate, and the temperature limit here is allowed to exceed the temperature limit under normal operating conditions by 20°C. The overload protector should not operate during normal operation. At the end of the test, the winding resistance should be measured as quickly as possible, and thereafter multiple measurements should be made at the shortest time intervals to draw a resistance curve corresponding to time. Use this curve to find out the instantaneous winding resistance when the switch is turned off. . If the motor-compressor is a single-phase design with a built-in overload protector, the total resistance of the main and starting windings should be measured.
If the motor-compressor is of three-phase design and has a built-in overload protector, the test must be repeated after the trip point has been determined and the machine is stopped before the overload protector cuts the circuit. If the circuit is continuously recorded with a resistor The temperatures obtained are exactly the same as those obtained by the shutdown resistance method described above. Alternatively, a resistor continuous recording loop can be used. 19.3 Operation under locked rotor condition
19.3.1 In order to carry out the tests of 19.3.2 and 19.3.3, the motor-compressor is filled with lubricating oil and refrigerant in accordance with the manufacturer's regulations, and with The specified protection device has its rotor locked by the manufacturer and connected to the power circuit as shown in Figure 102 or Figure 102A. During these two tests
- the motor overload protector should work reliably; - the motor-compressor and its starting and protection devices should not produce flames, sparks or molten metal; - use a thermocouple to measure temperature, and the motor - The maximum temperature of the compressor shell should not exceed 150C; other shell parts should not be deformed to the extent that they do not comply with the provisions of Chapter 8 and Chapter 29 of GB4706.1; a ground leakage current circuit breaker shown in Figure 102 Or the fuse shown in Figure 102A should not operate. After these two tests, the motor-compressor assembly shall be subjected to the leakage current test described in Chapter 13 with twice the rated voltage, applied between the windings and the housing! .Electrical strength test of Chapter 16.
If the motor-compressor/overload protector assembly submitted for inspection is designed to use two or more refrigerants, only a 15-day test is required, and the choice of refrigerant is determined by the manufacturer. To evaluate special protection systems, these test procedures may be modified if necessary. If the manufacturer confirms that the motor-compressor is definitely protected under the conditions of 0.85 times and 1.1 times the rated voltage, there is no need to do the fifteen-day test at 0.85 and 1.1 times the rated voltage. 19.3.2 Manually reset overload protection system. Connect the rotor-locked motor-compressor assembly to a power source equal to the rated voltage, and operate the protection system for 50 cycles with manual reset as quickly as possible. | |tt | The test may be terminated before 50 working cycles when the components constituting the overload protection system have individually withstood 50 working cycles when the motor they control is under locked rotor load conditions. Dual voltage - multi-connection motor-compressor operates separately on each voltage as described above. Three-phase motor-compressor assemblies are additionally tested under secondary single-phase conditions (see 19.3.3.5). 19.3.3 Automatically reset overload protection system 19.3.3.1 Connect the motor-compressor assembly that locks the rotor to a power supply equal to the rated voltage, and allow it to cycle the protector: the protector must be brought into the circuit under locked-rotor conditions All components operating under this condition, unless these components have been individually subjected to durability tests (see 19.3.3.3).
At the end of the first 72h of the locked rotor test, the motor-compressor assembly is subjected to the electrical strength test specified in Chapter 16. In addition to what is stated in 19.3.3.2, the test shall be carried out for 15 days and until the protector has completed at least 2000 cycles without failure. The polarity of the power supply is changed every 24 hours.
19.3.3.2 If the overload protection system is designed so that 2000 working cycles are not obtained within 15 days, the test shall continue until the minimum number of cycles, that is, 2000 working cycles, is obtained; or if the All components have been tested for durability in accordance with Article 19.3.3.3. The motor-compressor assembly can also be evaluated based on the 15-day test. In the latter case. Then record the shell temperature on the 12th and 15th days. If the temperature does not increase by more than 5°C within these three days, the test can be terminated. If the temperature is not stable but continues to rise, the test should be continued until the temperature is stable for 3 consecutive days. 19.3.3.3 The components and other control components related to 19.3.3.1 and 19.3.3.2 in the motor overload protection circuit, such as current-type starting relays operating under locked-rotor conditions, can be individually tested for their locked-rotor durability using artificial loads. (minimum 2000 cycles) test. In carrying out this test, the load on the element shall not be less than the load formed by the motor-compressor. The cycle rate and on-off time shall be the same as when the component is used in a motor-compressor. The rate may be increased unless the consent of the relevant parties is obtained. 19.3.3.4 For motor-compressors using multi-voltage single-connection motors, in accordance with 19.3 .3.1 stipulates that the test shall be carried out throughout the entire process at its high rated voltage, and then tested at its low rated voltage until a stable state is established (at least 3h). A separate sample may be used for the latter test. 19.3.3.5 Secondary single-phase test of three-phase motor-compressor Three-phase motor-compressor shall be tested according to the provisions of 19.3.3.1, and then tested under secondary single-phase conditions until stable state is established for at least 3 hours).
A separate sample may be used for each test. 19.3.3.6 Primary single-phase test of three-phase motor-compressors a Unless protected by three rated overcurrent elements and except as described in item b, three-phase motor-compressors shall be tested under primary single-phase fault conditions , subjected to the rotor stall test as a method to evaluate the ability of the overload protection system to protect the motor insulation and determine the reliability of the overload protection system. Www.bzxZ.net
b. Three-phase motor-compressor equipped with one of the following overload protection systems, except 19.3.In addition to the tests proposed in Article 1, it can be considered to meet the requirements of primary single-phase protection without performing other tests. i) A thermal interrupting protector sensitive to the motor current, installed in a well-proportioned arrangement at the center point of the star-connected motor and which disconnects at least two phases simultaneously.
i) A thermal protector located in each phase of the motor circuit, which uses components sensitive to the motor current that act mechanically on the pilot contacts that control the contactor coils. c. During the test, the motor-compressor housing temperature should neither exceed 150°C nor the motor windings be damaged. d. If the winding is disconnected, or the motor does not meet the requirements of the electrical strength test, or the relative distribution of current changes during the test, or the current measured at the end of the test is different from the current measured 3h after the start of the test or the first cycle of the system 3h later. If the measured current changes by more than 5%, the motor winding is considered damaged. e. The assembly that locks the rotor is powered by a power supply equal to the rated voltage, its power transformer is star-delta connected or delta-star
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