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Small-current grounding fault line selection system and line selection method

A technology of small current grounding and fault line selection, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc.

Inactive Publication Date: 2015-05-20
STATE GRID FUJIAN JINJIANG POWER SUPPLY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the difference between the zero-sequence current and the zero-sequence power direction method or zero-sequence current amplitude comparison method can only be used to realize the grounding line selection of the microcomputer.

Method used

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  • Small-current grounding fault line selection system and line selection method

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Embodiment Construction

[0015] refer to figure 1 As shown, the small current ground fault line selection system is used for the ground fault line selection of a 10KV neutral point ungrounded distribution network. The distribution network includes a bus 1 and several feeders 2 connected to the bus 1 respectively.

[0016] A line selection system for small current grounding faults, including zero-sequence current transformers 4 installed on each feeder 2, voltage transformers 5 installed on the bus 1, grounding transformers 6 connected to the bus 1, grounding transformers 6 connected to the The grounding loop 7 between the neutral point of the high-voltage side (Z-type wiring) and the earth, and the grounding line selection device 3, the grounding loop 7 is connected in series with a grounding resistor 71 with a resistance value of 135Ω and a vacuum contact for controlling the on-off of the loop. device 72, the grounding line selection device 3 is respectively connected with the zero-sequence current t...

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Abstract

The invention provides a small-current grounding fault line selection system, which comprises zero sequence current transformers, a voltage transformer, a grounding transformer, a grounding loop and a grounding line selection device, wherein the zero current transformers are arranged on each feed line, the voltage transformer is arranged on a bus, the grounding transformer is connected with the bus, the grounding loop is connected between a high-voltage side neutral point of the grounding transformer and the ground, and is connected in series with a grounding resistor and a contactor used for controlling the on-off state of the loop, the grounding line selection device is respectively connected with the zero sequence current transformer, the voltage transformer and the contactor, and is used for controlling the conduction of the grounding loop when the voltage transformer detects the zero sequence voltage, and then, a fault line is judged according to the current data collected by the zero sequence current transformer.

Description

technical field [0001] The invention relates to a grounding fault line selection system and a line selection method of a small current grounding system. Background technique [0002] For the 10KV neutral point ungrounded distribution network, when a line is single-phase grounded, its main characteristics: the magnitude of the zero-sequence current on the non-fault line is equal to the ground capacitance current of the line itself, and the direction flows from the bus to the line ; The magnitude of the zero-sequence current on the fault line is equal to the sum of the capacitance currents of all non-fault lines to ground, and the direction flows from the line to the bus. At present, it is usually only possible to use the difference of the above-mentioned zero-sequence current, and use the zero-sequence power direction method or the zero-sequence current amplitude comparison method to realize the grounding line selection of the microcomputer. Due to the small number of single...

Claims

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Application Information

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IPC IPC(8): G01R31/02
Inventor 郑鹏鹏
Owner STATE GRID FUJIAN JINJIANG POWER SUPPLY
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