Views: 166 Author: Site Editor Publish Time: 2021-04-13 Origin: Site
Generally, 10 kV high voltage rods are cement poles, which are common, and they are usually on both sides of the city. It is 12m high, or higher, no more than 18m. 35 kV high voltage rods are generally iron tower structure. We often see high voltage iron towers on both sides of the high way.
High-voltage lines are very important in our lives and urban construction. Safe and reliable high-voltage lines can ensure our production and life. Therefore, we will equip high-voltage lines with fault indicators to detect the potential electrical short circuit faults of the lines.
In the detection of high-voltage line faults, there will be a series of problems when using the earth fault indicator. The most common problems of the short circuit fault indicator are divided into two types. The first is the signal indicator problem when the operating circuit fails, and the second is the stuck operating mechanism. If you encounter these two major problems during the detection, how should you deal with it? Several methods are summarized below for your reference.
If the operating handle is placed in the closing position and the indication of the signal light does not change, it may be that the contact of the control switch, the auxiliary contact of the circuit breaker or the contact of the closing contactor is not contacted well, and the contact of the intermediate relay is welded and the closing coil is burned out, the same period switch is not put in, etc., after the cable fault indicator problem is eliminated, the switch can be closed again. If the tripping green light goes out but the closing red light is off, it may be that the closing red light bulb is burned out and the bulb should be replaced.
If the control switch and the closing coil are operating well, but the circuit breaker is in a jumping phenomenon (the tripping green light goes out and then lights up again), and the operating voltage is normal at this time, it indicates that the operating mechanism is faulty, such as the mechanical part of the operating mechanism is not flexible or inaccurately adjusted. So the operating mechanism should be repaired or adjusted before closing.
When the operating handle is placed in the closing position, the tripping green light flashes or the closing red light is off, the ground fault indicator has instructions, and the mechanical opening and closing position indicator is in the closing position, and the circuit breaker is closed. This may be due to poor contact of the auxiliary contacts of the circuit breaker, for example, the normally closed contact is not disconnected, and the normally open contact is not closed, so that the green light flashes and the red light does not turn on. It may also be the closing circuit disconnection and the closing red light burning out. At this time, the operator should disconnect the circuit breaker, and close the circuit after eliminating the dead short circuit fault. After the circuit breaker is closed, if the trip green light goes out, and the closing red light is instantaneously bright and off, the trip green light flashes and the horn sounds, and the circuit breaker automatically trips immediately after closing. This may be that the three points of the operating mechanism's turning arm are too high, and the tripping mechanism is tripped due to vibration. It may also be that the operating power supply voltage is too high, causing a strong impact when the bomber is placed in the closed position. At this time, the three-point position and operating voltage of the crank arm should be adjusted before closing.
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