JB/T 5810-1991 Motor Pole Coil and Field Winding Turn-to-Turn Insulation Test Specification JB/T5810-1991 Standard Download Decompression Password: www.bzxz.net

Machinery Industry Standards of the People's Republic of China
Motor pole coils and field windings
Inter-turn insulation test specifications
1 Subject content and scope of application
This specification specifies the motor pole coils And the interturn insulation test methods and test limits of field windings. JB/T 5810 ---91
This specification is applicable to the inter-turn insulation withstand voltage test 2 of DC motors, synchronous motor pole coils and field windings Referenced Standards
GB755 Basic Technical Requirements for Rotating Electric Machines|| tt||GB1029 Three-phase synchronous motor test method
3 Test instrument requirements
The inter-turn impulse withstand voltage test instrument should meet the following requirements: 3.1 The wavefront time of the first impulse voltage wave is 0.5us or 1.2us, the tolerance is ±30%. The 3.2 impulse voltage peak value is adjustable and has an indication. It is recommended to use a digital display peak voltmeter. The maximum impulse voltage output by the instrument should meet the maximum test voltage requirement of the sample.
3.3 The two sets of impulse voltage waveforms output by the instrument should be symmetrical, with a difference of ±5%, and ±3% is recommended. 3.4 The impulse test voltage should be measured on the motor coil or winding (terminal), with a tolerance of ±5% and ±3% recommended. 3.5 The waveform should be clear and stable, and the display sampling frequency should not be less than 25Hz. If the same level of clarity and stability can be achieved, other frequencies are allowed.
3.6 There should be dedicated measurement lines, reliable grounding terminals and necessary safety indication facilities. 4 Test methods and limits
4.1 DC motor
4.1.1 Inter-turn impulse withstand voltage test
is used to assess the ability of the turn insulation to withstand impulse voltage. The quality of the inter-turn insulation will be controlled by The impulse voltage generated by the discharge of the capacitor is directly applied to the magnetic pole coil or the lead wire of the magnetic field winding. A single magnetic pole coil should be placed on a shelf with good insulation from the ground for testing. The magnetic pole wire installed in the stator is opened. The magnetic pole coil can be removed as needed. , partial windings or the entire winding are tested in sequence. The outlet terminals of the remaining untested coils or windings related to the tested coil or winding magnetic circuit should be short-circuited and grounded together with the core to prevent induced voltage in these coils. Helical reverse-wound coils must have insulation between the layers of the reverse-wound turns.
The waveform comparison method can be used to identify inter-turn short circuits. The waveform of the tested coil or winding is compared with the normal waveform. If the waveform is consistent, it is qualified. Other effective identification methods can also be used. Waveform comparison can compare the waveforms of a certain coil or winding under normal and abnormal conditions, or it can also compare the waveforms of two coils or windings with the same specifications. When conducting comparative tests on two coils or windings, they should be separated by a certain distance enough to eliminate mutual electromagnetic interference, and attention should be paid to the consistent wiring direction. For each test, the first and last wiring of the coil or wire group to be tested should be exchanged, and the test should be repeated - times. The Ministry of Mechanical and Electronics Industry of the People's Republic of China approved the implementation of the 1995-05-07
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JB/T5810.-··91
inter-turn impulse withstand voltage test on 1991-10-15 The peak value Ur of the coil or winding impact electric bed is: U/= 2 (1)
where: U motor rated voltage, kV. For other excitation pole coils or magnetic field windings, it refers to the coil under test or the highest rated excitation core pressure. For the pole coil or field winding that is connected to the armature winding during operation, U~ refers to the operating voltage drop of the coil or winding under test, and I. The operating voltage drop is also allowed to be 10% of the rated voltage of the motor.
If the number of turns of the coil under test or the total number of turns of the winding under test is 6 turns or less, the peak value of the impulse voltage is 250V × the number of turns of the coil under test or the total number of coins of the winding under test, and the minimum is 1000V . The number of impacts in each test shall be no less than 5 times. It is allowed to use medium frequency voltage test to assess the ability of inter-turn insulation to withstand impulse voltage. The limit value of medium frequency voltage test is equivalent to the peak value of impulse voltage test
4.1.2 Inter-turn short circuit inspection test
Other valid methods for checking inter-turn short circuit Method Sichuan adopts the medium frequency voltage comparison method, power frequency voltage drop method or induced voltage method. The test works! Provision is made. || tt | The voltage is applied directly between the leads of the pole coil or field winding. A single salient pole coil should be placed on a shelf well insulated from the ground for testing. For salient poles after installation and direct winding of integral salient poles and hidden pole coils, the magnetic pole coils, partial windings or the entire winding can be tested in sequence according to needs. Insulation must be provided between the layers of the reversed turns of the spirally reversed coil. The regulations regarding the identification of inter-turn short circuit, distance of the test object, wiring direction, and number of repeated tests are the same as Article 4.1.1. The peak value of the coil or winding impulse voltage in the inter-teacher impulse withstand voltage test is: /2 for motors with rated excitation voltage below 500V. ×10 times the minimum rated excitation voltage of the motor is 2×1.5kV. If the rated excitation voltage of the motor is above 500V, it is 2× (4kV + 2 times the rated excitation voltage of the motor), kV. The number of impacts for each test is not less than 5 times. The medium-frequency voltage test is allowed to be used to assess the ability of the inter-turn insulation to withstand impulse voltages. The limit value of the medium-frequency voltage test is equivalent to the peak value of the impulse voltage test.
4.2.2 Turn-to-turn short circuit inspection test
is used to check whether the insulation between turns of the coil or winding is short-circuited. For hidden-pole large and medium-sized rotor coils, power frequency voltage can be used to check the coil for inter-turn short circuit during the wiring process. The effective value of the inter-turn frequency test voltage should not be less than 2.5V, and the upper limit is 5V. It is recommended to use 5V. According to If the current changes, check whether the turns are short circuited. During the overspeed test and before and after the final assembly test run, the AC impedance method can be used to check the inter-turn short circuit. During the overspeed test, during the rising and falling processes and in the static state, the magnetic field winding is monitored. Under the specified power frequency voltage, the current and corresponding impedance value are: Check whether there is a sudden change between turns to check whether there is a short circuit between turns: the test is carried out according to GB1029 and factory standards.
For salient pole magnetic pole coils, power frequency voltage or intermediate frequency voltage can be used to conduct an inter-turn short circuit inspection test on the coil during and after the hot pressing process, and 10 times the rated excitation can be applied to both ends of the coil lead wire. The power frequency voltage effective value or the intermediate frequency voltage value of the voltage (each pole), according to the current size (when using the intermediate frequency voltage test, the deviation of the current value should not be greater than 2%) and local heating conditions, check whether there is a short circuit between the turns. For the magnetic field winding, you can Use the voltage drop method to check for short circuit between turns + apply the effective value of 220V power frequency voltage at both ends of the winding, and check whether there is a short circuit between turns by measuring the voltage at both ends of each magnetic pole coil in the root row (the deviation should be less than 5%). 5 Test procedure
For the main pole, commutating pole, series pole coil of DC motor and the magnetic pole coil of salient pole synchronous motor, the online turns can be tightened (line tightening device 13.
JB/T5810 -91
After assembling (alternating), each process before and after installing the iron core is tested. The DC motor compensation coil and the hidden pole synchronous motor magnetic pole coil can be tested in various processes after they are embedded in the iron core and fixed. The test procedure is determined by the factory. 6. The impulse withstand voltage test of DC motors (magnetic pole coils and field windings) and synchronous motors (magnetic pole coils and field windings) is in accordance with GB755. The impulse withstand voltage test of finished motors (magnetic pole coils and field windings) is in accordance with 4.1.1 and 4.2. .1 The requirements for the inter-paragraph impulse withstand voltage test shall be carried out on the stator or the rotated field winding before final assembly. It is allowed to do this on the coil or winding after the wire turns are tightened (the tightening force of the wire turns is the same as after assembly). Turbine generators (magnetic pole coils and field windings) that have passed the inter-turn short circuit inspection test according to 4.2.2 may not be subjected to the inter-turn impulse withstand voltage test for the time being. Additional notes:
This standard was proposed by the Shanghai Electrical Apparatus Research Institute of the Ministry of Mechanical and Electronic Industry and Caikou. This standard is drafted by Shanghai Electric Machinery Factory
Li Shengzhi, the main drafter of this standard.
.
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