Closing faults can be divided into electrical faults and mechanical faults. There are two types of closing methods: manual and electric. Manual failure to close is generally a mechanical failure. Manually can be closed, electric can not be closed is an electrical fault.
1. Protection action: The protection action has been analyzed in the front to make the switch trip. Before the switch is powered, the line has a fault protection circuit to make the anti-skip relay function. The switch immediately trips after closing. Even if the transfer switch is still in the closed position, the switch will not close again and continuously jump.
2. Protection fault: Now the five-proof function is set in the high-voltage cabinet. It is required that the switch is not in the running position or the test position cannot be closed. That is, the position switch is not closed, and the electric motor cannot be closed. This type of failure is often encountered during the closing process. At this time, the running position light or the test position light does not light. Move the switch cart slightly to close the limit switch to send power. If the limit switch offset distance is too large, it should be adjusted.
3. Electrical cascading failure: In the high-voltage system, some electrical interlocks are set for the reliable operation of the system. For example, in a single bus segmentation system with two power supply lines, it is required that the two switches of the two incoming line cabinets and the female joint cabinet can only be combined. If all three are closed, there is a danger of reverse power transmission. And the short-circuit parameter changes, and the short-circuit current increases in parallel. (The incoming cabinet interlocking circuit is connected with the normally closed contact of the female joint cabinet, and the incoming cabinet of the female joint cabinet is required to be closed. The interlock circuit of the female joint cabinet is a normally open and a separate two-way inlet cabinet. After the normally closed series is connected, it can be connected again. This can ensure that the mother cabinet can only be powered when the two line inlet cabinets are closed and the other is opened.) When the high voltage cabinet cannot be electrically closed, the first consideration should be whether There is an electrical chain, and you cannot blindly use manual closing. Electrical interlocking faults are generally improperly operated and cannot meet the closing requirements. For example, the joint busbar is one-in-one, but the handcart in the bayonet cabinet is pulled out and the plug is not plugged in. If the interlock circuit fails, you can use a multimeter to check the fault location. It is simple and convenient to judge the auxiliary switch fault by using red and green lights, but it is not reliable. Can be determined with a multimeter check. The method of repairing the auxiliary switch is to adjust the angle of the fixed flange, adjust the length of the auxiliary switch link, and the like.
4. Open circuit fault of control circuit: In the control loop, the control switch is damaged, the line is disconnected, etc., so that the closing coil can not be powered. At this time, the closing coil has no sound. There is no voltage across the measuring coil. The method of inspection is to check the open circuit point with a multimeter.
5, closing coil failure: closing coil burning is a short circuit fault. At this time, there are phenomena such as odor, smoke, and insurance melting. The closing coil is designed for short-time operation and the power-on time cannot be too long. After the failure of the closing, the cause should be found in time, and the composite brake should not be repeated multiple times. In particular, the closing coil of the CD type electromagnetic operating mechanism is easily burned out due to a large number of closing currents. The test power transmission method is often used when troubleshooting a high voltage cabinet that cannot be closed. This method can eliminate line faults (except transformer temperature, gas faults), electrical interlock faults, and limit switch faults. The fault location can basically be determined inside the handcart. Therefore, in the emergency treatment, the test position can be used to send power, and the standby hand truck can be replaced for power transmission. This can do more with less and reduce power down time.
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