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Single-phase grounding fault handling method suitable for low-current grounding systems

A single-phase ground fault, small current grounding technology, applied to the fault location, fault detection according to the conductor type, measurement of electricity, etc., can solve the problems of lack of principle protection schemes, inability to adapt to distribution network protection systems without communication conditions, etc. Achieve the effects of short fault handling time, short isolation time, and small fault power outage range

Active Publication Date: 2019-04-16
NANJING ELECTRIC POWER ENG DESIGN +3
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Problems solved by technology

However, in the centralized feeder automation and distributed feeder automation modes, communication channels are required, which cannot adapt to distribution network protection systems that do not have communication conditions
[0005] In addition, at present, there are relatively mature configuration and setting schemes for short-circuit fault protection of distribution lines, but for small current ground faults, there is still a lack of protection schemes with perfect principles, reliable actions, and simple implementation

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  • Single-phase grounding fault handling method suitable for low-current grounding systems
  • Single-phase grounding fault handling method suitable for low-current grounding systems

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Embodiment Construction

[0044] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0045] The overcurrent protection method is often used for short-circuit faults. Due to the short distribution lines and many branch lines, it is impossible to realize the cooperation between the outgoing line protection, the branch line protection, and the distribution transformer protection only by using the current fixed value, and there are many delays between the protection levels To cooperate, in order to ensure rapidity, the number of series is generally controlled within three levels. For small current single-phase ground faults, capacitive currents exist both upstream and downstream of the fault point; especially in the arc suppression coil system, due to the compensation function of the arc suppression coil, the current difference between the upstream and downstream of the fault point is small, and the overcurrent principle cannot be used to achieve protecti...

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Abstract

Provided is a single-phase grounding fault handling method suitable for low-current grounding systems. The problem of coordination between outgoing line protection and line protection under a single-phase grounding fault in a low-current grounding system is solved. Low-current grounding fault protection methods by combining the load power direction and the grounding fault transient power directionwith the delays of terminals are provided respectively for radial lines and hand-in-hand lines, and local isolation of a low-current grounding fault is realized. All upstream healthy sections can remove faults without blackout. In a hand-in-hand network, downstream healthy lines can also be directly transferred to a standby power supply. The method of the invention can adapt to different modes ofdistribution network automation systems and distribution line protection devices, can be used to handle a low-current grounding fault quickly and accurately, and has wide practical application value.

Description

technical field [0001] The invention belongs to the field of relay protection for distribution networks, and in particular relates to a single-phase grounding fault processing method suitable for a small current grounding system. Background technique [0002] Small current ground fault location technology has become a research hotspot in recent years. Field applications include centralized feeder automation, and distribution terminals or fault indicators are often used to collect ground fault transient current waveforms. The centralized feeder automation method uses the principle of transient current similarity to locate the main station to determine the fault section. The positioning algorithm is relatively complicated, and it is difficult to cooperate with the terminals of different manufacturers and the main station. In distributed feeder automation, due to the more Less, algorithms based on transient current similarity are more difficult than centralized models. In add...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26G01R31/08G01R31/02
CPCG01R31/086G01R31/50H02H7/262H02H7/266
Inventor 李妍李腾赵雪霖曹程杰范逸斐何大瑞胡国伟
Owner NANJING ELECTRIC POWER ENG DESIGN
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