Some standard content:
ICS29.180
Machinery Industry Standard of the People's Republic of China
JB/T5555-2001
Transformers for machine tools
Published on 2001-10-09
China Machinery Industry Federation
Implementation on 2001-12-01
JB/T55552001
This standard is a revision of JB/T5555-1991 "Machine Tool Control Transformers". This standard retains the technical requirements, test methods, inspection rules, and basic terms of packaging, transportation and storage of the original standard. The main differences between this standard and JB/T5555-1991 in terms of technical content are as follows:
1. The protection level of the transformer is improved to meet the requirements of GB/T5226.1; 2. After adjusting the moisture resistance test, the insulation resistance value meets the requirements of GB/T14048.1; 3. The output voltage value of the transformer under the instantaneous power condition is modified to make it more practical and meet the requirements of the VDE0550 standard: 4. The rated output capacity of the transformer is expanded to 3000VA. This standard refers to the German industrial standard DINVDE-0550 "Specifications for small transformers" and the International Electrical Commission Standard IEC742:1989 "Technical requirements for isolation transformers and safety isolation transformers". This standard complies with the relevant requirements of GB/T5226.1-1996 "Industrial Machinery Electrical Equipment Part 1: General Technical Conditions" and GB/T14048.1 "General Principles for Low-voltage Switchgear and Control Equipment". This standard replaces JB/T5555-1991 from the date of implementation. This standard is proposed and managed by Chengdu Machine Tool Electrical Equipment Research Institute. The main drafting unit of this standard: Beijing Electrical Equipment Factory. The main drafters of this standard: Wu Zhongjie and Wang Hai. This standard was first issued in July 1991, and this is the first revision. 1 Scope
Machinery Industry Standard of the People's Republic of China
Machine Tool Control Transformer
Transformers for machinetools This standard specifies the classification, technical requirements, test methods, inspection rules, etc. of machine tool control transformers. JB/T5555-2001
Replaces JB/T5555-1991
This standard is applicable to electrical control circuits with AC 50Hz, rated power supply voltage not exceeding 500V, and rated output voltage not exceeding 250V.
The machine tool control transformer specified in this standard can be used as a single-phase industrial electrical control transformer (hereinafter referred to as transformer) for control power supply and electronic equipment, working lighting and signal power supply of industrial machinery and equipment. 2 Cited standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T2828—1987
GB/T 2900.1-1992
GB/T2900.15—1997
GB/T4942.2-1993
GB/T5226.1—1996
GB/T13384—1992
GB/T14048.1—1993
3 Definitions, symbols, codes
Batch inspection counting sampling procedures and sampling tables (applicable to inspection of continuous batches) Electrical Terminology Basic terms
Electrical terms Transformers, mutual inductors, voltage regulators and reactors Protection levels of low-voltage electrical enclosures
Industrial machinery and electrical equipment Part 1: General technical conditions General technical conditions for packaging of electromechanical products
General provisions for low-voltage switchgear and control equipment
The definitions, symbols and codes of this standard, unless otherwise defined, comply with the relevant provisions of GB/T2900.1, GB/T2900.15 and GB/T14048.1.
3.1 Definitions
3.1.1. Machine tool control transformers Transformers for machine tools Transformers with electrically isolated windings used as power supplies for control circuits, lighting circuits and signal circuits in electrical and electronic equipment and system control circuits for machine tools and industrial machinery. 3.1.2 Rated supply voltage ratedsupplyvoltage The nominal voltage applied to the input end of the transformer under normal operating conditions. 3.1.3 Rated output voltage ratedoutputvoltage The nominal value of the output voltage of the transformer in normal operation when the rated current is output at the rated power supply voltage and rated frequency. 3.1.4 Rated output capacity ratedoutputcapacity Approved by China Machinery Industry Federation on October 9, 2001 and implemented on December 1, 2001
JB/T5555-2001
Rated output capacity refers to the sum of the products of the rated output voltage and the rated current in each circuit when the transformer supplies power to various circuits at the same time. No-load output voltage no-loadoutputvoltage3.1.5
The output voltage when no-load is at the rated power supply voltage and rated frequency. Output voltage under load load outputvoltage3.1.61
The output voltage when the rated power is output at the rated power supply voltage and rated frequency. Output voltage under instantaneous power conditions'outputvoltageofinstantaneouspower3.1.7
The output voltage when the instantaneous power is output at the rated power supply voltage and rated frequency. 3.2 Symbols
The main symbols specified in this standard are as follows: U.: rated power supply voltage;
Un: rated output voltage;
U: rated insulation voltage;
U.: output voltage under load;
Uap: output voltage under instantaneous power conditions; Uk: no-load output voltage.
4 Product classification
4.1 Products can be divided into shell type and core type according to structure. 4.2 Products can be divided into vertical type and horizontal type according to installation method. 4.3 Specifications and Parametersbzxz.net
4.3.1 Specifications
The rated output capacity of the transformer is 40VA, (50VA) 63VA, 100VA, (150VA) 160VA, 250VA, (300VA), 400VA, (500VA) 630VA, (800VA) 1000VA, (1500VA), 1600VA, (2000VA), 2500VA, 3000VA.
Note: The number system without brackets is preferred. 4.3.2 Parameters
The basic parameters of the transformer shall comply with the provisions of Table 1. Table 1 Basic parameters of transformers
Rated output capacity
40~3000
Rated power supply voltage U
380, 220
Rated output voltage U
220, (127), 110, (36), 24, 12, 61) According to user needs, a terminal of ±5% or ±10% can be added to the rated power supply voltage U. The rated output voltage can be in accordance with the requirements of 9.1.2 of GB/T5226.1-1996.
4.3.3 Overall dimensions and installation dimensions
The overall dimensions and installation dimensions of the transformer should be clearly specified in the specific product standards. 2
5 Technical requirements
5.1 Normal working conditions and installation conditions
5.1.1 Ambient air temperature
JB/T5555-2001
5.1.1.1 The upper limit of ambient air temperature shall not exceed +40℃. 5.1.1.2 The average value of ambient air temperature for 24 hours shall not exceed +35℃. 5.1.1.3 The lower limit of ambient air temperature shall not be lower than -5℃. 5.1.2 Altitude
The altitude of the installation site shall not exceed 2000m. 5.1.3 Atmospheric conditions
The relative humidity of the atmosphere shall not exceed 50% when the ambient air temperature is +40℃. Higher relative humidity can be achieved at lower temperatures. The average maximum relative humidity of the wettest month is 90%, and the average minimum temperature of the month is +25℃, and condensation on the product surface due to temperature changes shall be taken into account.
5.1.4 Pollution level
The pollution level of the transformer is "level 3".
5.1.5 Shell protection level
The protection level of the transformer should be at least IP1X or IPXXA according to 6.2.1a of GB/T5226.1-1996. Note: For old products, due to structural reasons, the protection level can be IPOO in certain use occasions. 5.1.6 Installation category (overvoltage category)
The installation category of the transformer is "Ⅱ" and "Ⅲ". 5.2 Structure
5.2.1 See the "Note" in Table 1 for the input winding voltage adjustment terminal.
5.2.2 Fastening and anti-loosening requirements
When the transformer uses fasteners to connect the iron core and the terminal, reliable measures should be taken to prevent loosening. 5.2.3 Anti-corrosion requirements
Ferrous metal parts should have anti-corrosion measures. 5.2.4 Material requirements
The transformer should select suitable materials with performance that meets the use requirements, and its main insulating materials should be able to pass the corresponding tests. a) Adapt to the test of resistance to abnormal heat and fire hazards in 8.1.4 of GB/T14048.1-1993; b) Adapt to the determination of comparative tracking index (CTI) of insulating materials in 8.1.6 of GB/T14048.1--1993. 5.2.5 Wiring terminals
a) The wiring terminals should have reasonable crimping or plug-in wiring methods, such as: studs (nails), nuts and washers or combination screws. b) There should be corresponding markings (voltage number or number) near the wiring terminals. c) The studs (nails) and combination screws used to clamp external wires should be able to ensure that the terminals do not loosen or damage the wires when clamping or loosening. d) The wiring terminals should have a structure to prevent contact with live parts or have an isolation baffle above the screws, etc. This requirement is not required for extra-low voltages below 50V.
e) The mechanical strength of the wiring terminals should comply with the requirements of Table 2. 3
Standard value
Screw diameter
JB/T5555-—2001
Table 2 Tightening torque for mechanical strength of terminal blocks Tightening torque
Diameter
1 Column 1 applies to headless screws that cannot protrude from the hole when tightened, and other screws that cannot be tightened with a screwdriver wider than the root diameter of the screw.
2 Column II applies to screws and nuts tightened by a screwdriver. 3 Column III applies to screws and nuts that can be tightened by other tools. 5.2.6 Grounding protection device
a) The grounding device of the transformer should have measures to prevent loosening and should not be used for other tightening purposes; b) The body of the grounding terminal should use screws or parts with the same connection function as the screw and have appropriate anti-corrosion measures. If screws are used, the minimum diameter is M4, and there should be a grounding mark nearby. 5.2.7 Components requirements
a) The surface of the plastic parts of the transformer shall not have bubbles or cracks; b) The iron core of the transformer must have a protective layer. 5.2.8 Electrical clearance
The minimum electrical clearance value of the transformer shall comply with the provisions of Table 3. Table 3 Minimum electrical clearance
Rated insulation voltage U,
Minimum electrical clearance
5.2.9 Creepage distance
The minimum creepage distance of the transformer shall comply with the provisions of Table 4. 4
>150~300
>300-660
Rated insulation voltage U
>63~125
>125~250
>250~400
>400~500
>500~630 (690)
JB/T5555—2001
Table 4 Minimum creepage distance
Creep distance
Material group
Note: Insulating materials can be divided into 4 groups according to their comparative tracking index (CTI). Insulation material group: 1: 600 ≤ CTI
I: 400 ≤ CTI<600
IⅢla: 175 ≤ CTI<400
b: 100 ≤ CTI<175
5.3 Performance requirements
5.3.1 Working system
The transformer is suitable for uninterrupted working system under rated load. 5.3.2 Dielectric properties
Ma, Ⅲb
5.3.2.1. When the electrical clearance of the transformer is less than the value in Table 3, an impulse withstand voltage test must be carried out, and its impulse withstand voltage value shall comply with the provisions of Table 5.
Table 5 Impulse withstand voltage value
Rated insulation voltage U
>50~100
>100~150
>150~300
>300~660
Note: The impulse withstand voltage value is the test value at an altitude of 2000m. Installation category II
Impulse withstand voltage value
The transformer should be able to withstand the 1min power frequency withstand voltage test of the test voltage value listed in Table 6 without breakdown or flashover. 5.3.2.2
Table 6 Power frequency withstand voltage value
Rated insulation voltage U
Test voltage
>60~300
>300~660
JB/T5555—2001
The insulation of the transformer should be able to withstand the induction withstand voltage test of twice the rated voltage and twice the rated frequency. The voltage application time is 5.3.2.3
5min. It is allowed to use a higher frequency. In this case, the test time t is calculated according to formula (1); but it should not be less than 2min. 2×rated frequency
×5 (min)
Test frequency
5.3.3 Moisture resistance
The transformer should be able to adapt to the verification of the moisture resistance of electrical appliances in 8.1.2 of GB/T14048.1—1993. 5.3.3.1 The steady-state damp heat test shall be in accordance with 8.1.2a of GB/T14048.1-1993. 5.3.3.2 The alternating damp heat test shall be in accordance with 8.1.2b of GB/T14048.1-1993. 5.3.3.3 The type of humidity resistance test to be adopted shall be clearly specified in the specific product standard. (1) After the test, the insulation resistance value shall not be less than that specified in Table 7, and it shall be able to withstand 80% of the power frequency withstand voltage value in Table 6 and a 1-minute power frequency withstand voltage test without insulation breakdown and flashover. Table 7 Insulation resistance value Rated insulation voltage U Insulation resistance value 5.3.4 Temperature rise > 60~660 When the ambient air temperature is within the range of 10~40℃, the temperature rise of the transformer shall comply with the provisions of Table 8. Table 8 Temperature rise limits of insulation coils, terminals and cores
Terminals
5.3.5 No-load loss of transformer
Limited allowable temperature rise
Class A insulation
The no-load loss of transformer shall be clearly specified in the specific product standards. 5.3.6 Output voltage u of transformer under load
Class E insulation
Measurement method
Resistance method
Thermocouple method
Thermometer method
When the input winding of the transformer is at rated power supply voltage, rated frequency and load power factor cosΦ=1, the load output voltage of the control, lighting and signal windings shall comply with the provisions of Table 9. 6
Rated output capacity
Control and lighting winding output voltage U under load. V
Signal winding output voltage U under load.
JB/T5555——2001
Table 9 Load output voltage value
40~1000
(95%~105%)Um
>10~12
5.3.7 Transformer output voltage under instantaneous power conditions (1500), 1600~3000
When the output of the transformer has a control winding, the transformer is under the instantaneous power conditions listed in Table 10 (power factor co sΦ=0.5), the output voltage of the control winding is not less than -90%U
rated output
hourly power
rated output
instantaneous power
(500)
(700)
instantaneous power value at rated output capacity
(1500)
Note: When the rated output capacity of the control winding does not match the table, the instantaneous power is determined as 2.5 times the rated output capacity. 5.3.8 Transformer no-load output voltage
(300)
At the rated power supply voltage and frequency of the transformer input winding, the no-load output voltage of the control and lighting windings shall not exceed 1.1U., and the no-load output voltage of the signal winding shall not exceed 6V (at 6V rated output voltage) or 12V (at 12V rated output voltage). 5.3.9 Transformer efficiency
When the input winding of the transformer is at rated power supply voltage, rated frequency and rated load (cosΦ=1), the efficiency of the transformer shall comply with the requirements of Table 11.
Table 11 Efficiency
Rated output capacity
Efficiency n
6 Test method
6.1 Basic requirements
≤100
160~630
≥1000
Measurement shall be carried out with instruments and meters that have no influence on the measured value as far as possible, and shall be calibrated when necessary. The electric meter shall be of level 0.5. 6.1.1
JB/T5555—2001
6.1.2 Except for the test methods specified in this standard, the rest of the test methods for transformers shall be carried out in accordance with GB/T14048.1. 6.2 General inspection
6.2.1 Visually and manually inspect the transformer nameplate or label, fastening and anti-loosening, anti-corrosion, grounding protection device, terminal block, surface quality of parts and product packaging quality.
6.2.2 The overall dimensions and installation dimensions, electrical clearance, creepage distance, etc. of the transformer shall be inspected with calipers or special measuring tools. 6.2.3 The test of the protection level of the transformer enclosure shall comply with the relevant provisions in Chapter 8 of GB/T4942.2-1993. 6.3 Mechanical strength test of the terminal block
The terminal block connection strength test shall be carried out in accordance with the requirements of 8.1.8.2 of GB/T14048.1-1993. 6.4 Material requirement test
The insulation material test shall be carried out in accordance with the requirements of 8.1.4 and 8.1.6 of GB/T14048.11993. 6.5 Dielectric property test
6.5.1 Impulse withstand voltage test
6.5.1.1 The waveform of the impulse withstand voltage test shall comply with the provisions of 8.2.3.4.2 of GB/T14048.1-1993. 6.5.1.2 Impulse withstand voltage application location
a) Between input winding and output winding;
b) Between input winding and output winding to the core, and between output windings. 6.5.2 Power frequency withstand voltage test
6.5.2.1 The power frequency withstand voltage test of the transformer shall be in accordance with 8.2.3.4.3 of GB/T14048.1-1993. 6.5.2.2 The test power supply voltage requirements shall be in accordance with 8.2.3.4.3 of GB/T14048.1-1993. 6.5.2.3 Power frequency withstand voltage test application location
a) Between input winding and output winding;
b) Between input winding and output winding to the core, and between output windings. 6.5.2.4 The specified value of leakage current shall be less than 100mA. 6.5.2.5 If there is no breakdown or flashover during the 1-minute power frequency withstand voltage test, it is considered qualified. The test method shall be carried out in accordance with 8.2.3.4.3 of GB/T14048.1-1993.
6.5.3 Induction withstand voltage test
Any winding of the transformer is subjected to twice the rated voltage and twice the rated frequency, and the other windings are open-circuited for 5 minutes. If the frequency is higher, it should not be less than 2 minutes. The inter-turn insulation shall not be broken down. 6.6. Moisture resistance test
The test method shall be in accordance with 8.1.2 of GB/T14048.1-1993, and shall be clearly specified in the specific product standards. 6.7 Temperature rise test
6.7.1 Temperature rise test at rated power supply voltage
When the transformer input winding is at rated power supply voltage, rated frequency and the output winding is connected to rated load, after the transformer reaches thermal stability, the temperature rise of each part of the transformer shall be measured, which shall meet the requirements of Table 8. 6.7.21, Temperature rise test at 1 times rated power supply voltage This test is carried out immediately after 6.7.1, and only the test voltage needs to be increased to 1.1 times the rated power supply voltage. After the transformer is thermally stable again, the temperature rise of the transformer coil shall be measured, which shall meet the requirements of Table 8. The test shall be in accordance with 8.2.3.3 of GB/T14048.11993. The test circuit is shown in Figure 1. 8
6.8 No-load loss test
JB/T5555—2001
B, a voltage stabilizer; B, a voltage regulator; B, a step-up transformer; B-test transformer; R-resistance; K-switch; Hz-frequency meter; V, V-voltage meter; A-current meter Figure 1 Temperature rise test circuit
The input winding of the transformer is connected to a low power factor power meter at the rated power supply voltage and frequency, and the no-load loss measured should meet the requirements of 5.3.5. The test circuit is shown in Figure 2.
·Power supply
B, a voltage stabilizer; B, a voltage regulator; B, a step-up transformer; B, a tested transformer; Hz rated rate meter; V—voltage meter; W—low power factor power meter Figure 2 No-load loss test circuit
6.9 Output voltage test under load
The input winding of the transformer is at rated power supply voltage, rated frequency and the output winding is connected to rated load. After the transformer reaches thermal stability, the measured output voltage shall meet the requirements of Table 9. The test circuit is carried out according to Figure 1. 6.10 Output voltage test under instantaneous power conditions The output voltage value measured on V, i.e. Um, of the transformer input winding at rated power supply voltage, rated frequency and the output winding at instantaneous power conditions (power factor cOsΦ=0.5) shall meet the requirements of 5.3.7. U≥0.9U, and the test circuit is shown in Figure 3. Power supply
B,-voltage stabilizer; B,-voltage regulator; B,-step-up transformer; B,-test transformer; cos$-power factor meter; Hz--frequency meter; V,, V, voltage meter; A-ammeter: L-inductor; R-resistor; K-switch Figure 3 Instantaneous power test circuit8 No-load loss test
JB/T5555—2001
B, a voltage stabilizer; B, a voltage regulator; B, a step-up transformer; B- tested transformer; R- resistance; K- switch; Hz- frequency meter; V, V- voltage meter; A- current meter Figure 1 Temperature rise test circuit
The input winding of the transformer is connected to a low power factor power meter at rated power supply voltage and frequency, and the no-load loss measured should meet the requirements of 5.3.5. See Figure 2 for the test circuit.
·Power supply
B, a voltage stabilizer; B, a voltage regulator; B, a step-up transformer; B, a tested transformer; Hz rated rate meter; V—voltage meter; W—low power factor power meter Figure 2 No-load loss test circuit
6.9 Output voltage test under load
The input winding of the transformer is at rated power supply voltage, rated frequency and the output winding is connected to rated load. After the transformer reaches thermal stability, the measured output voltage shall meet the requirements of Table 9. The test circuit is carried out according to Figure 1. 6.10 Output voltage test under instantaneous power conditions The output voltage value measured on V, i.e. Um, of the transformer input winding at rated power supply voltage, rated frequency and the output winding at instantaneous power conditions (power factor cOsΦ=0.5) shall meet the requirements of 5.3.7. U≥0.9U, and the test circuit is shown in Figure 3. Power supply
B,-voltage stabilizer; B,-voltage regulator; B,-step-up transformer; B,-test transformer; cos$-power factor meter; Hz--frequency meter; V,, V, voltage meter; A-ammeter: L-inductor; R-resistor; K-switch Figure 3 Instantaneous power test circuit8 No-load loss test
JB/T5555—2001
B, a voltage stabilizer; B, a voltage regulator; B, a step-up transformer; B- tested transformer; R- resistance; K- switch; Hz- frequency meter; V, V- voltage meter; A- current meter Figure 1 Temperature rise test circuit
The input winding of the transformer is connected to a low power factor power meter at rated power supply voltage and frequency, and the no-load loss measured should meet the requirements of 5.3.5. See Figure 2 for the test circuit.
·Power supply
B, a voltage stabilizer; B, a voltage regulator; B, a step-up transformer; B, a tested transformer; Hz rated rate meter; V—voltage meter; W—low power factor power meter Figure 2 No-load loss test circuit
6.9 Output voltage test under load
The input winding of the transformer is at rated power supply voltage, rated frequency and the output winding is connected to rated load. After the transformer reaches thermal stability, the measured output voltage shall meet the requirements of Table 9. The test circuit is carried out according to Figure 1. 6.10 Output voltage test under instantaneous power conditions The output voltage value measured on V, i.e. Um, of the transformer input winding at rated power supply voltage, rated frequency and the output winding at instantaneous power conditions (power factor cOsΦ=0.5) shall meet the requirements of 5.3.7. U≥0.9U, and the test circuit is shown in Figure 3. Power supply
B,-voltage stabilizer; B,-voltage regulator; B,-step-up transformer; B,-test transformer; cos$-power factor meter; Hz--frequency meter; V,, V, voltage meter; A-ammeter: L-inductor; R-resistor; K-switch Figure 3 Instantaneous power test circuit
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