System and method for detecting single-phase ground fault point of power distribution line

A single-phase-to-ground fault and distribution line technology, applied in the fault location, information technology support system, etc., can solve the problem that the single-phase grounding fault point of the distribution line cannot be measured, etc., to facilitate the implementation of detection and ensure safety. The effect of running, simplifying the structure

Active Publication Date: 2015-02-18
吉林市简通电气科技有限公司 +2
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] For this reason, what the present invention is to solve is the technical problem that the patent disclosed in the reference document cannot realize the measurement of the single-phase ground fault point of the distribution line, and provides a single-phase ground fault point detection system and detection system for the convenient embodiment of the distribution line. method

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  • System and method for detecting single-phase ground fault point of power distribution line
  • System and method for detecting single-phase ground fault point of power distribution line

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Embodiment Construction

[0031] Refer to an embodiment of the present invention for a distribution line single-phase ground fault point detection system used in the neutral point through the arc suppression coil grounding system, including: an electronic switch 1, one end of which is connected to the neutral point of the primary side of the distribution line transformer It is used to control the on-time of the switch according to the zero-sequence current phase, control the zero-sequence current to obtain transient parameters and steady-state parameters, and ensure that the zero-sequence current is real and will not damage the equipment in the detection system, especially in the detection system. During the process, the electronic switch 1 produces a larger aperiodic component value when the amplitude of the zero-sequence current is larger, so the electronic switch 1 avoids opening when the zero-sequence current crosses zero, so as to ensure that the aperiodic component of a larger value of the zero-seq...

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Abstract

The invention relates to a system and a method for detecting a single-phase ground fault point of a power distribution line. A switch, a sampling resistor, a current-limiting inductor and a processor which are connected in series with one another to form a zero sequence current loop form a circuit which is connected between a neutral point of a transformer and the ground, so that time constants at different inductance values can be obtained, and a group of time constant solution modes can be obtained according to a time constant formula; therefore, an inductance value of a cable from a bus to the single-phase ground fault point is calculated; the length of the cable is calculated according to a relation of the inductance value and the impedance and the length of the cable, namely the position of the single-phase ground fault point is determined; subsequent quick maintenance is facilitated; and the influence on a power grid can be reduced to the maximum extent.

Description

technical field [0001] The invention relates to the technical field of distribution network fault detection, in particular to a detection system and a detection method for a single-phase ground fault point of a distribution line. Background technique [0002] In order to increase the reliability of the power supply of the distribution network, most of the distribution network adopts the neutral point through the resistance grounding system and the neutral point through the arc suppression coil grounding system. A resistor with a certain resistance value is connected between the earth, and the resistor forms a parallel circuit with the capacitance of the system to the ground, which has certain advantages in preventing resonance overvoltage and intermittent arc grounding overvoltage; the neutral point is grounded through the arc suppression coil. Connect an inductive arc suppressing coil between the neutral point and the earth. When a single-phase ground fault occurs in the sy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
CPCY04S10/522Y04S10/52
Inventor 王鹏高作学付浩姜言金尹相爱李铁锋韩冬
Owner 吉林市简通电气科技有限公司
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