Full-voltage grounding comprehensive processing device

Abstract

The invention discloses a full-voltage grounding comprehensive processing device. The device comprises a cabinet body. The cabinet body comprises a wire inlet cabinet, an arc light processing cabinetand a monitoring cabinet. The arc light processing cabinet of the cabinet body is provided with a power distribution network neutral point ungrounded distribution system. The power distribution network neutral point ungrounded distribution system comprises an arc suppression coil and a high resistor, a neutral point is led out from a grounding transformer in a power distribution network, and an intelligent quick switch system is arranged on the neutral point of the grounding transformer to control the arc suppression coil. According to the full-voltage grounding comprehensive processing device, mutual cooperation of contact arc suppression formed by a high resistance and the arc suppression coil is used to compensate for each other; various modes can be selected according to different sites; an arc grounding overvoltage is adaptively eliminated; and a distribution system combines advantages of various technologies, high reliability of a neutral point ungrounded system is maintained, and hidden dangers brought to the system by an arc grounding overvoltage and the like are solved.

Description

technical field [0001] The invention relates to the field of medium-voltage power distribution equipment, in particular to a full-voltage grounding comprehensive processing device. Background technique [0002] my country's medium-voltage distribution network adopts the operation mode of non-effective neutral point grounding, including neutral point grounding mode through arc suppression coil, neutral point non-grounding mode and neutral point grounding mode through high resistance. In the non-effectively grounded operation mode of the medium-voltage system, the three-phase line voltage still maintains a symmetrical relationship when a single-phase ground occurs, and does not affect the continuous power supply to the load. Therefore, it is not necessary to disconnect the line immediately. According to the relevant regulations of the power grid, it can run continuously for 1 to 2 hours after a single-phase ground fault occurs, thereby significantly improving the reliability o...

AI Technical Summary

Problems solved by technology

Although some of these two methods have played a certain role, their shortcomings and shortcomings are also very obvious.

[0005] Arc coil: 1. The arc suppression coil only compensates the power frequency capacitive current, but the actual grounding point contains a large amount of high frequency current and resistive current. It is possible to maintain the continuous combustion of the arc, and maintaining the power supply is likely to cause disastrous consequences such as accident amplification, fire and personal injury

2. The compensation of the arc suppression coil makes the difference between the steady-state characteristics of the fault line and the non-fault line very small, which brings challenges to the fault line selection

[0006] Defects of the arc suppression cabinet: 1. Once the wrong phase is selected, it will lead to short circuit between phases and grounding; 2. In the process of directly metal grounding and disconnecting the grounding phase, sometimes it will cause a strong state process, which may not only cause electrical failures such as transformers, etc. Damage to the equipment may also cause malfunction of the relay protection device

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