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Small earthing current electric network single phase fault wire selecting method and apparatus

A technology of small grounding current and line selection method, which is applied in the direction of fault location, emergency protection circuit device, electrical components, etc., to achieve the effect of ensuring correctness, improving the correct rate of line selection, and improving accuracy and reliability

Inactive Publication Date: 2010-04-07
YANSHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of automatic line selection for single-phase faults in power grids with small grounding currents

Method used

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  • Small earthing current electric network single phase fault wire selecting method and apparatus
  • Small earthing current electric network single phase fault wire selecting method and apparatus
  • Small earthing current electric network single phase fault wire selecting method and apparatus

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Embodiment Construction

[0013] The three-phase voltage of the two busbars and the zero-sequence current of each line in the small ground current grid pass through figure 1 The signal conversion and conditioning circuit board shown converts both voltage and current signals into voltage signals that can be received by the line selection device, and then transmits them to the line selection device through the PCI data acquisition card. At this time, the data is processed by the line selection algorithm. When there is a fault, it will be displayed on the LCD screen and output through the switch input and output board, and the micro-printer can also print the fault information.

[0014] This device can collect data of 32 channels, including two sections of busbar three-phase voltage, a total of 6 channels of voltage signals, 26 lines of zero-sequence current, each channel is converted by a precision voltage or current converter, and high-order signals above 1600 Hz are filtered out Harmonics, one of the s...

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Abstract

This invention discloses a method and a device for selecting single-phase fault of small earth current nets, which integratedly processes multiple kinds of fault signals based on the earth situation of the non-earth and arc-extinguishing coils, applies multiple kinds of line selention criteria to constitute quantification espressions showing that a line may be a fault one to get the final line selection result by integrated judgment, the selection device has good man-machine interface and is easily operated and installed, the hardware of the device is a PCI bus industrial control mainboard, and the selection algorithm is realized by virtual instrument technology to differentiate faults of single-phase earth, breakage of voltage mutual-inductors and ferromagnetic resonance and displayed byLCD.

Description

technical field [0001] The invention relates to a single-phase fault line selection method and device for a small grounding current power grid, which is suitable for power systems with a neutral point of 66kV or below that is not grounded or grounded through an arc suppression coil. When a single-phase fault occurs in the power grid, the device Can automatically select the fault line. Background technique [0002] The small ground current power grid refers to the power system where the neutral point is not grounded or grounded through the arc suppression coil. This grounding method does not form a short circuit when a single-phase ground fault occurs, and the fault current is very small. The regulations stipulate that it can continue to run for 1 to 2 hours after a single-phase ground fault occurs. In our country, the small ground current method is generally adopted in the power grid with a voltage level of 6kV to 66kV. The most common fault in medium voltage distribution ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26G01R31/08
Inventor 贾清泉窦春霞王宁
Owner YANSHAN UNIV
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