High Voltage Switchgear Closing Fault Judgment and Processing

High Voltage Switchgear Closing Fault Judgment and Processing

High Voltage Switchgear Closing Fault Judgment and Processing
Closing faults can be divided into electrical faults and mechanical faults. There are manual and electric closing methods. Manual failure to close is generally a mechanical failure. Manual can close, electric can not close is an electrical fault.
1. Protective action: there is a fault protection circuit before the switch is powered to make the anti-jump relay function. The switch will trip immediately after closing. Even if the switch is still in the closed position, the switch will not close again and jump continuously.
2. Protection fault: now the high pressure cabinet is set with five prevention functions, requiring that the switch is not in the running position or the test position can not be closed. That is, the position switch is not closed, the electric can not close. This kind of fault is often encountered in the closing process. At this time, the running position lamp or test position lamp is not on. Move the switch handcart slightly so that the limit switch is closed to send electricity. If the offset distance of the limit switch is too large, it should be adjusted.
3. Electrical chain fault: high voltage system for the reliable operation of the system to set up some electrical chain. For example, in the single-bus segmented system with two power inputs, only two switches are required for the two input cabinets and the busbar cabinets. There is a danger of backtransmission if all three are switched on. And short circuit parameters change, parallel running short circuit current increases. The chain circuit of the inlet cabinet is connected to the normally closed contact of the bus cabinet, and the inlet cabinet can be closed in the state of opening of the bus cabinet.
The interlocking circuit of the busbar is connected with a normally open and a normally closed series of two ways into the line cabinet and then connected. In this way, we can ensure that the bus header can send electricity when one of the two access cabinets closes and the other opens. When the high voltage cabinet cannot be electrically closed, first of all, it should be considered whether there is an electrical chain, and not blindly use manual closing. Electrical chain fault is generally improper operation, can not meet the requirements of closing. For example, although the line cabinet is a close, but the handcart in the brake cabinet is pulled out, the plug is not inserted. If the interlocking circuit is faulty, use a multimeter to check the fault location.
Using red and green light to judge the fault of auxiliary switch is simple and convenient, but not reliable. Use a multimeter to check and determine. The method of repairing auxiliary switch is to adjust the Angle of fixed flange, adjust the length of auxiliary switch connecting rod and so on.
4. The control loop open fault: in the control loop control switch damage, line disconnection, etc., so that the closing coil can not get electricity. At this time the closing coil has no sound of action. There is no voltage at both ends of the measuring coil. Use a multimeter to check open circuit points.
5. Closing coil failure: closing coil burning is a short circuit fault. At this time there is peculiar smell, smoke, insurance melting phenomenon occurs. The closing coil is designed to work in a short time, and the power time should not be too long. After the failure of closing, the cause should be found in time, and should not be repeatedly closed. In particular, the closing coil of CD type electromagnetic operation mechanism is easy to burn out due to the large current.
The method of test power is often used in repairing the failure of high voltage cabinet not closing. This method can eliminate line faults (except transformer temperature and gas faults), electrical interlock faults and limit switch faults. The fault part can be basically determined in the interior of the handcart. Therefore, in emergency treatment, the test position can be used to test the power supply, and the replacement of the standby handcart power supply method for processing. This can get twice the result with half the effort and reduce the blackout time.

High Voltage Switchgear Closing Fault Judgment and Processing

Closing faults can be divided into electrical faults and mechanical faults. There are manual and electric closing methods. Manual failure to close is generally a mechanical failure. Manual can close, electric can not close is an electrical fault.

1. Protective action: there is a fault protection circuit before the switch is powered to make the anti-jump relay function. The switch will trip immediately after closing. Even if the switch is still in the closed position, the switch will not close again and jump continuously.

2. Protection fault: now the high pressure cabinet is set with five prevention functions, requiring that the switch is not in the running position or the test position can not be closed. That is, the position switch is not closed, the electric can not close. This kind of fault is often encountered in the closing process. At this time, the running position lamp or test position lamp is not on. Move the switch handcart slightly so that the limit switch is closed to send electricity. If the offset distance of the limit switch is too large, it should be adjusted.

3. Electrical chain fault: high voltage system for the reliable operation of the system to set up some electrical chain. For example, in the single-bus segmented system with two power inputs, only two switches are required for the two input cabinets and the busbar cabinets. There is a danger of backtransmission if all three are switched on. And short circuit parameters change, parallel running short circuit current increases. The chain circuit of the inlet cabinet is connected to the normally closed contact of the bus cabinet, and the inlet cabinet can be closed in the state of opening of the bus cabinet.

The interlocking circuit of the busbar is connected with a normally open and a normally closed series of two ways into the line cabinet and then connected. In this way, we can ensure that the bus header can send electricity when one of the two access cabinets closes and the other opens. When the high voltage cabinet cannot be electrically closed, first of all, it should be considered whether there is an electrical chain, and not blindly use manual closing. Electrical chain fault is generally improper operation, can not meet the requirements of closing. For example, although the line cabinet is a close, but the handcart in the brake cabinet is pulled out, the plug is not inserted. If the interlocking circuit is faulty, use a multimeter to check the fault location.

Using red and green light to judge the fault of auxiliary switch is simple and convenient, but not reliable. Use a multimeter to check and determine. The method of repairing auxiliary switch is to adjust the Angle of fixed flange, adjust the length of auxiliary switch connecting rod and so on.

4. The control loop open fault: in the control loop control switch damage, line disconnection, etc., so that the closing coil can not get electricity. At this time the closing coil has no sound of action. There is no voltage at both ends of the measuring coil. Use a multimeter to check open circuit points.

5. Closing coil failure: closing coil burning is a short circuit fault. At this time there is peculiar smell, smoke, insurance melting phenomenon occurs. The closing coil is designed to work in a short time, and the power time should not be too long. After the failure of closing, the cause should be found in time, and should not be repeatedly closed. In particular, the closing coil of CD type electromagnetic operation mechanism is easy to burn out due to the large current.

The method of test power is often used in repairing the failure of high voltage cabinet not closing. This method can eliminate line faults (except transformer temperature and gas faults), electrical interlock faults and limit switch faults. The fault part can be basically determined in the interior of the handcart. Therefore, in emergency treatment, the test position can be used to test the power supply, and the replacement of the standby handcart power supply method for processing. This can get twice the result with half the effort and reduce the blackout time.