Ensure the safety maintenance measures in power distribution operation

2.1 Maintenance of transformer

Transformer, as an important part of the distribution system, aims to reduce interference, facilitate power transportation, change the voltage of the system, control the voltage value and current value, and protect the operation of the system. The working principle is to transmit power through current transformer or voltage transformer and reduce current value in a primary loop based on electromagnetic induction. At the same time, with the help of a secondary loop to implement secondary conversion of voltage and current, until voltage and current into the standard voltage requirements. However, in the process of current conversion, the final result of power conversion needs to meet the standard requirements, so as to ensure the stable operation of instruments and instruments in the distribution system. Therefore, safety maintenance personnel must do a good job in the operation and maintenance of the transformer, and regularly adjust the operation parameters in strict accordance with the requirements to ensure that the rated capacity of the transformer is within the specified range. For example, when inspecting the operation status of the transformer, no matter whether the equipment has power failure or not, the staff should not remove it alone or operate it across the shield. In the presence of the guardian, the staff must wear insulation shoes for inspection and maintenance. To prevent the secondary side open circuit problem, it is necessary to perform the secondary side operation of the device and check the secondary circuit breaker of the voltage transformer. If the high voltage fuse is fused, disconnect the isolation switch to isolate the voltage transformer and replace the secondary circuit breaker in time to ensure the stable operation of the grounding protection.

2.2 Transformer maintenance

The application of transformer can transform the power energy in the power transmission system into the power energy that meets the standard requirements, monitor the power consumption of the power system, and improve the operating efficiency of the system. The instrument has low requirements for working environment, long service life, strong short-circuit resistance, low input cost and good thermal stability, and is widely used in industrial production and residential power systems. So in the daily operation of the transformer maintenance operation maintenance personnel need to use the instruments to check listen to the voice in the operation of, and view the cable, high pressure joint, low pressure joint, winding pressure parts, air cooling device and supporting porcelain insulator, such as content, whether there are abnormal phenomenon, and in a timely manner to replace damaged parts, avoid buried safe hidden trouble, to ensure the stable operation of transformer.

2.3 Dc System maintenance

The DC system, called the high-frequency switching power supply rectifier, is mainly used to provide power for the normal operation of the signal busbar, protection device, high-voltage circuit breaker and relay of the distribution equipment, so as to ensure the normal operation of the system. The instrument is mainly composed of charging cabinet and battery, so in the daily operation of the DC system, the staff must do a good job in the maintenance of the battery and charging cabinet, in order to improve the stability and reliability of the system operation. For example, in daily patrol work, for the operation and maintenance of high-frequency switching power supply rectifier, because the semiconductor of the charging cabinet is prone to overheating and overcurrent phenomenon, or the battery is loaded for a long time, resulting in the destruction of the original, or even burn. Therefore, the staff must strengthen the inspection and maintenance of the battery in strict accordance with the provisions, to prevent the battery from increasing the number of charging at the same time, reduce the capacity of the battery. Periodically check the operating parameters of the output voltage and input voltage to ensure that the parameter values are within the limited range, so as not to affect the normal operation of the yellow battery if the voltage is too high or too low. In addition, it is necessary to timely check the operating environment of the equipment and timely do the ventilation work of the environment to lay a solid foundation for the operation of the system.

2.4 Power Capacitor maintenance

Power capacitors, as the basic power equipment in distribution system, can improve the power factor of distribution system and compensate the reactive power factor of the system. In the safety maintenance of power capacitor operation, the following work needs to be done: (1) appearance inspection. Once the outside of power capacitor changes, it is easy to lead to overheating of the joint, affecting the normal operation of the system. Therefore, the appearance of power capacitors must be regularly checked. If problems such as oil leakage and cracking are found during the inspection, corresponding measures should be taken to deal with them in time. (2) Check the voltage value. The staff need to use automatic switching device to check the change of the voltage value of the instrument, understand the rule of voltage value change, and do a good job of equipment conversion and switching, to avoid the phenomenon of compensation and reactive power back. (3) Check the current value. Check the current value of power capacitor regularly, once it is greater than the maximum rated current value (1.3 times of rated current value), it is necessary to adjust the operation parameters in time to control the current value within the rated range.

2.5 Maintenance of cable lines

For cable line maintenance, relevant departments must establish perfect the cable line inspection records, strengthen the cable line inspection tour, on a regular basis to monitor cable failure tube, insulation and metal line load situation, and through the cable of the preventive test cable running state, and take effective measures to deal with the cable line fault, to ensure that the cable line and stable operation. For example in the cable line in the process of operation, operation maintenance personnel can through the instrument measured cable inductance and capacitance shocks for cable partial discharge test, let the cable and other accessories in the weak position of partial discharge, the insulation and then with the help of a test circuit of partial discharge signals collection, intensity and location of partial discharge, check whether in resonance and low damping oscillation voltage, and do it Good record, so as to provide basis for decision making.