Increasing the phase sequence protector Because the operating voltage of the phase sequence protector sold on the market is generally 380V, in the high voltage cabinet, the phase sequence protector cannot be directly used, and the voltage generated by the voltage transformer cannot be directly used. Adding a transformer is not convenient. Later, a phase sequence relay with a working voltage of 100V was purchased. The model number is P1PFS1. The phase sequence relay is small in size and the dimensions are 50×40×80. It is convenient to install in the high voltage cabinet. Firstly, the busbars in the high-voltage cabinet are modified, and then two JDZ-1010/0.1, 0.5 type voltage transformers are installed in each high-voltage cabinet to convert the high voltage into a low voltage of 110V, and then the phase sequence protector is connected. To the voltage transformer, such as. Then, the phase sequence contact is extended, and an intermediate relay 3ZJ (model: JTX-3CAC220V) is added to connect the under-phase and phase-sequence protection signal KA69 (ie, X7, 20 on the terminal block) of the air compressor PLC. The 3ZJ normally closed contacts 5 and 6 of the wrong phase signal ensure that the motor can only rotate forward and not reverse, so as to achieve phase sequence protection of the air compressor. The machine side control is realized, and the closing control button of the air compressor is connected with the 5 and 6 points of the transfer switch KK of the high voltage switch cabinet. The switch type of the circuit breaker is LW12-16D/49.6780.5, and the air compressor is divided into points. The gate button can be connected to the 7 and 8 points of the transfer switch KK of the high voltage switchgear to realize the machine side control. However, there is still a certain hidden danger in this type of control, because the 5,6 of the closing switch KK of the air compressor is in the closed position after the circuit breaker is closed, and is connected to the closing switch of the air compressor. After the closing coil of the high-voltage circuit breaker is always in the closed state, once the circuit breaker trips, the circuit breaker in the closing coil circuit is normally closed. Closed within 0.2s, and the closing switch of the air compressor can be disconnected after the circuit breaker trips for 1s, so that the closing coil is energized again, the circuit breaker is closed again, and the air compressor is started again. This is very dangerous.
In this case, two measures can be taken: one is to use the manual energy storage for the start of the circuit breaker; the other is to turn the energy storage switch to the off position after the electric energy storage, so that the circuit breaker is closed after the circuit breaker is closed. Without energy storage, the energy storage normally open contact in the closing coil circuit is in the off position, so that even if the 5 and 6 points of the KK are closed, the normally closed point of the circuit breaker is closed, and the closing coil will not be energized. This must be clearly stated to the operator and noted on the high voltage switchgear to ensure proper operation of the air compressor. High-pressure cabinet transformation material table.
After the above series of transformations, the XGN2-12 high-pressure cabinet can meet all the electrical requirements for the normal operation of the air compressor. It has been operating normally since use, ensuring smooth production and saving the company investment costs. It has a good effect.
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