Single-phase earth fault line selection device and method for small-current grounding system

A single-phase ground fault and small current grounding technology, which is applied in the field of relay protection and distribution network, can solve problems such as unobvious fault characteristics, low line selection efficiency, and difficult control, so as to ensure the correct rate of line selection and fast Compare the effect of phase changes and amplitude changes, short run times

Pending Publication Date: 2019-09-27
北京中电泰瑞科技有限公司
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Problems solved by technology

However, due to various reasons such as complex actual site conditions, difficult control, and unobvious fault characteristics, t

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  • Single-phase earth fault line selection device and method for small-current grounding system
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  • Single-phase earth fault line selection device and method for small-current grounding system

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Embodiment Construction

[0034] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0035] see figure 1 , the present invention provides a single-phase grounding fault line selection device for a small current grounding system, comprising:

[0036] Intelligent controller DO, capacitor L 0 , resistor R 0 , switching device, data acquisition device, voltage transformer PT 0 and multiple current transformers CT 1 , CT 2 ,…….CT n ;

[0037] The voltage transformer is used to collect the three-phase voltage signal of the bus, the data acquisition device is connected to the voltage transformer, and the information of the voltage transformer is collected into the data acquisition device; the plurality of current transformers are respectively used for collecting current signals of multiple lines to be tes...

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Abstract

The invention discloses a single-phase earth fault line selection method for a small-current grounding system. The method comprises the following steps: an intelligent controller is used for judging and determining that a capacitor with a fixed capacitance value and a resistor with a fixed resistance value are respectively put into a neutral point grounding branch for a preset duration by a cut-off switch after a single-phase earth fault happens to the small-current grounding system according to a three-phase voltage signal of a bus collected by a voltage transformer; a plurality of current transformers are respectively used for collecting current signals of a plurality of to-be-tested lines within the preset duration and transmitting the current signals to the intelligent controller through a data collection device; the intelligent controller is used for respectively analyzing the phase variable quantity and the amplitude variable quantity of a zero-sequence current of the plurality of to-be-tested lines according to the current signals; and the intelligent controller is used for comparing the phase variable quantity and the amplitude variable quantity of the zero-sequence current of the plurality of to-be-tested lines, and selecting the line with the maximum phase variable quantity and amplitude variable quantity as a fault line.

Description

technical field [0001] The invention relates to the technical fields of relay protection and distribution network, in particular to a single-phase ground fault line selection device and method for a small current grounding system. Background technique [0002] In the medium-voltage power distribution system, in order to improve the reliability of power supply, the neutral point non-effective grounding method is adopted, and the arc-suppression coil grounding method is usually used to compensate the current of the line-to-ground capacitance, but it brings difficulties in line selection for single-phase grounding faults. The problem. If the faulty line cannot be selected and cut off in time, it will easily lead to the spread of faults and power outages. [0003] At present, many methods have been proposed for fault line selection, including power component method, injection method, disturbance method, harmonic method and so on. However, due to various reasons such as complex...

Claims

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Application Information

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IPC IPC(8): G01R31/08
CPCG01R31/086
Inventor 武守远付守滨孙希涛庞怀江王睿栾晓明
Owner 北京中电泰瑞科技有限公司
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