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

A technology of small ground current and line selection method, which is applied in fault locations, emergency protection circuit devices, electrical components, etc., to solve frequent misoperations, improve reliability, and ensure correctness.

Inactive Publication Date: 2007-08-22
YANSHAN UNIV
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  • Summary
  • 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] Pass the three-phase voltage of the two sections of the busbar in the small ground current grid and the zero-sequence current of each line through the signal conversion and conditioning circuit board shown in Figure 1, and convert the voltage and current signals into voltages that the line selection device can receive The signal is then sent to the line selection device through the data acquisition card. At this time, the line selection algorithm is used to process the data. When there is a fault, it will be displayed on the LCD screen and output through the switch input and output board. The micro-printer can also print accident details.

[0014] This device can collect data of 32 channels, including 6 channels of voltage signals of 2 sections of busbar three-phase voltage, 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, the signal conversion and c...

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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 by LCD.

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 Applications(China)
IPC IPC(8): H02H7/26G01R31/08
Inventor 贾清泉窦春霞王宁
Owner YANSHAN UNIV
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