Air compressor failure excitation troubleshooting

1刖目6,13 air compressor unit motor nameplate data is model 10501480, rated power 3501. rated voltage 6000, rated speed 428 matching high voltage switchgear nameplate data is model KTG4A. voltage 6kV. supporting thyristor excitation equipment nameplate data For the model ugly rated excitation voltage 5.

2 Fault phenomenon The unit has a fault when it is turned on. Before starting the machine, the synchronous motor is braked and the excitation cabinet is normal. However, when the line is started, the excitation cabinet can't be excited. The main current is high. When the vent valve is closed at full load, the motor current rises rapidly. Up to 80 people can't operate normally. .

3 inspection process According to the phenomenon of failure, the author first checked the excitation cabinet. First, visually find the fuse, 210, thyristor 7828 reverse, 2 burned, after replacing the component, use the wave detector to detect the trigger point waveform, according to the excitation main circuit wiring 2 detection jack 200, 0 measured rectified voltage waveform 1.

The waveform display triggering device and other links have no change and work normally.

Then check the demagnetization link, short-circuit 852 to adjust the excitation voltage so that the voltage of 360 degrees of electrical angle i1 turbulent voltage waveform ç½” reading is 45 brothers using the wave machine to measure the waveform of the demagnetization thyristor 7 ft.

Fifl3 thermal magnetic 4 squeeze, turn off, the waveform is sealed under the button 0, measured the waveform of the demagnetization thyristor 7 anti 02.

No4 thermal magnetic 4, when the waveform is turned on, the waveform of the waveform is also normal, so it can be concluded that the thyristor excitation equipment works normally. Try to start the test, the fault remains. So we decided to conduct a comprehensive inspection of the parts of the unit. Firstly, the components of the excitation cabinet are replaced with burnt components, and the state of the excitation cabinet is restored.

In order to ensure reliability, we also tried to use the excitation cabinet of Unit 1 and the high-voltage cabinet synchronization machine of Unit 2 to run online. The No. 1 excitation cabinet works normally. It is concluded that the No. 1 excitation cabinet is faultless; secondly. The pressure cabinet was inspected.

In the case of disconnecting the power supply of the main engine, the high-voltage cabinet circuit breaker is normally closed. To ensure the reliability of the oil switch operation, the oil switch is cleaned and cleaned to ensure that the oil switch is in good contact. First, the synchronous motor power cable is insulated from phase to ground, and the excitation cable is grounded to the ground to confirm that the synchronous power cable excitation cable is normal. First, check the stator and rotor of the synchronous motor. The stator and rotor are first cleaned and dried. The DC resistance of the stator insulation resistance is measured. The stator is subjected to withstand voltage. It was found that the rotor had a ground discharge phenomenon during the boosting process, so the rotor coil was insulated, and it was confirmed that the motor condition was good. The single-machine operation was normal, and the online debugging was normal, and then the online startup was started. Still can not be encouraged, ask exactly where it is, the air pressure equipment is interlocked by the interlocking motor high-voltage cabinet excitation cabinet, the mutual transmission of signals to complete the start and stop synchronous motor, then ask if it will appear in these Which part of the chain part is measured, when debugging online. The input current side phase current is not zero, and when the line is started, the input power side phase current is zero. This means that when the power is turned on, the pressure cabinet does not transmit the power-on nickname to the excitation cabinet. Therefore, the excitation cabinet online closing circuit does not work, the excitation cabinet does not work, so there is no excitation current output. Therefore, according to the high-voltage cabinet excitation cabinet paper, high voltage The contact between the cabinet and the excitation cabinet is the auxiliary switch contact of the oil switch. There are two pairs of contacts of 8182 and 83 84. After checking and measuring, when the oil switch is closed, the two pairs of contacts are not rotated in place, and the contact is not good. After the high-pressure cabinet oil switch is closed, the closing signal cannot be transmitted to the excitation device to activate the excitation cabinet in time, so that the excitation cabinet has no excitation output, which causes the synchronous motor to be unable to pull in the synchronous rotation speed when running to sub-synchronization. An overcurrent is generated. After the auxiliary switch is adjusted in place, the synchronous motor is started again, and the fault disappears and the cut is normal.

4 Reasons for analysis The thyristor and fuse are burnt because the excitation device has no excitation output. The motor cannot enter the synchronous speed, causing the current to be too high, which is not the root cause of the fault.

The root cause of this fault is that the power-on signal of the high voltage cabinet is not transmitted to the excitation cabinet. The cause of this failure is due to the low-oil switch of the high-voltage cabinet. The type-type operating mechanism is a spring mechanism. This mechanism has a large vibration during operation, and the auxiliary switch operated by the mechanism has poor vibration resistance. The vibration generated by frequent start and stop is easy to cause the contact of the auxiliary switch 12 to be misaligned, and the auxiliary switch has 8 pairs of auxiliary contacts associated with the excitation cabinet synchronous machine. The misalignment of the contact will cause the air pressure equipment electrical control system. Failure, this is what we should pay attention to when maintaining the equipment.

5 Conclusion The disadvantage of the spring operating mechanism is that as the number of operations increases. The spring is easy to strain and deform. Therefore, the spring-operated parts should be inspected regularly. If the spring strain is found, it should be replaced in time to ensure that the spring operating mechanism can work in place to ensure the normal operation of the equipment.

Cheng Shi. Research is subject to domain electrical technology. 2 papers have been sent.

Editor Liang Yu went to page 93 Chen Jundong. The application of the Bayesian method in the dimensioning of the target. Telecommunications Technology, 20054139142.

4 Xu Bingzhen, Li Shengxiang. Knowledge of power cable fault detection technology. Beijing Mechanical Industry Press, 1999.

The first author profile Zhang Zhili, male, born in 1966, Henan Fuyang, Ph.D., professor. research. Field weapon launch system simulation and automatic detection. Edited to the paper

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