In one inspection, it was found that the indicator of a 6kV switchgear was not lit. After replacing the indicator, the fault still remains. Open the cabinet door to check the control loop wiring, but see the resistance of the indicator (the indicator is Xl) 5 series) Suddenly falling to the ground, and then split open, picking by hand, the resistance is hot, the screw connection on the resistor is loose, the ignition at the contact is caused by the rapid heating of the resistor, which will burn the resistor and cause the fault of the indication circuit. The core screw of the reactor in the capacitor cabinet is loose, causing vibration sound and affecting operation. The substation has not been thoroughly inspected and repaired for more than ten years. After long-term operation, due to electromagnetic force and mechanical fatigue, the core screws are loose, causing each capacitor to be issued after being put into operation. The "wire" noise affects the operation, and after the power failure is applied to the screws of various parts of the core, it returns to normal. Later, similar situations occurred in other substations, and the same treatment was done. This means that the parts such as the core of the reactor should be inspected regularly, and the screws and other parts should be tightened. The crimping of the wiring screw is loose, causing the secondary circuit of the transformer to open, and the faulty transformer is burnt. A line meter showed that there was no current in phase A. After careful searching, it was found that the phase A current terminal on the terminal block of the switchgear had burned and charred, causing the A phase secondary current loop to open, but fortunately, it was discovered early and replaced in time. Otherwise, it is possible to burn the transformer. The reason is that the terminal crimping screw is loose, the contact resistance is large, and heat is generated, thereby burning the terminal. When the switchgear is newly installed, the small busbar screws on the top of the cabinet are loose and hit the top of the switchgear, causing the DC link to be grounded. When a new high-voltage switchgear is installed, when the small busbar on the top of the cabinet is installed, the screw is not tightened, causing the small busbar terminal to tilt up and hit the top of the cabinet, thus causing a ground fault in the DC loop. .
The low-voltage total incoming switchgear operating handle screw is too loose, so that the switch cannot be closed. In the autumn, the power supply was cleaned and overhauled, and the equipment was thoroughly cleaned, but the equipment was not carefully checked. As a result, the low-voltage total line switch could not be closed when the power was restored. Open the door and check that the screws on the operating handle are too loose. The switch handle cannot be closed and therefore cannot be closed. After closing the screw, the closing is successful. Although the above-mentioned several cases caused by loose screws are small, they have adverse effects on the normal operation of the equipment. If not handled in time, it may even cause more troubles. Precautions: Check the new equipment thoroughly. People often have the idea of ​​using new equipment without checking and using it. However, it is neglected that due to vibration during transportation, some parts will be loosened, so it is necessary to check not only before commissioning, but also to tighten the screws of each part. Equipment that has been put into operation for a long time (including the secondary circuit) should be inspected regularly, especially small parts such as screws should not be neglected to ensure that the equipment operates in good condition. Normal operation parking inverter parking inverter When 6R household 24 receives the parking signal from P, the 6R household 24 inverter state will last for 3s, at this time, the excitation current has decayed below 1SA, that is, from rectification into the inverter state. Therefore, the energy in the excitation winding of the motor is fed back into the human power grid, which not only saves energy but also de-excitation, and plays the role of the motor and the excitation system.
Convenient human-machine communication 6R household 4 has two serial interfaces with R, 85 and RS232 standards respectively. The 6RA24 can be connected to a PC via a cable. Using the spelling machine, the Siemens software module can be used to easily and intuitively connect the 6R households 24 to the system function modules to realize parameter setting, modification, operation monitoring and reporting, and fault display.
Conclusion Through the use of one year, the synchronous motor and the excitation system work well, which reduces the accident time, improves the operation rate of the rolling mill, and achieves better economic benefits. Practice has proved that our factory has succeeded in improving the excitation system of synchronous motor by using PLC technology and DC speed regulation technology, and has made a beneficial attempt for the promotion of new technology.
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