Single-phase grounding fault detection and positioning method and system for low-current grounding power distribution network

A low-current grounding and grounding fault technology, applied in the fault location and other directions, can solve problems such as the inability to accurately locate the grounding fault position, the inability to generate a large enough coded signal current fault indicator, and the large 5th harmonic current of the faulty line. The effect of facilitating manual line inspection to locate ground faults
CN104101812AActive Publication Date: 2014-10-15BEIJING INHAND NETWORKS TECH
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
BEIJING INHAND NETWORKS TECH
Publication Date
2014-10-15

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Abstract

Power distribution networks of countries such as China and the like mainly adopt a low-current grounding method. Most faults of the low-current grounding power distribution networks are single-phase high-resistance grounding faults and low amplitude of transient capacitive current signals, short duration, and high detection difficulty are generated in a fault process so that an effective fault detection and positioning system is lacked. The invention discloses a fault detection and positioning method and system for a low-current grounding power distribution network. The system includes feeder line monitoring units, a communication terminal and a system master station. A feeder line monitoring unit wirelessly and synchronously triggers the other two phases to transmit data after a suspected grounding fault is detected. The system master station and the communication terminal adopt GPS time service. The communication terminal and the feeder line monitoring units carry out time hack through a time division multiplexing wireless communication network. The system master station collects three-phase feeder line monitoring unit data at a plurality of points through the communication terminal and detects and positions a grounding fault according to calculated zero-sequence voltage and zero-sequence current and issues a fault signal to feeder line monitoring units in front of a fault point on a fault phase so as to carry out fault indication.
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Description

technical field

[0001] The present invention generally relates to the fault detection and location of feeder automation part in power distribution automation, especially the method and system for single-phase ground fault detection and location of feeder with small current grounding distribution network. Background technique

[0002] In the power system, the power comes from the power plant, and is transmitted to the load side through the high-voltage or ultra-high-voltage transmission network, and then the power is distributed to users of different voltage levels by the network with a lower voltage level, which mainly plays the role of power distribution in the power grid. The network is called the distribution network, referred to as the distribution network. In the power system, the distribution network is a short board that affects the reliability of power supply for users. The investment in the distribution network is relatively insufficient, and the level of automatio...

Claims

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