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Substation small resistor grounding device and control method thereof

A technology of small resistance grounding and control methods, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problems of high fault tripping rate and inability to effectively identify transients, etc., and achieve the effect of reducing fault tripping rate and eliminating transient faults

Active Publication Date: 2020-01-17
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology can effectively improve the coverage of zero-sequence overcurrent protection, but it cannot effectively identify the transient, and the fault tripping rate is high

Method used

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  • Substation small resistor grounding device and control method thereof
  • Substation small resistor grounding device and control method thereof
  • Substation small resistor grounding device and control method thereof

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Embodiment Construction

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0031] see figure 1 , is a schematic structural diagram of a substation small resistance grounding device provided in Embodiment 1 of the present invention, the device includes a grounding transformer, a neutral point small resistance R 0 , the first split-phase switch KA, the second split-phase switch KB, the third split-phase switch KC, the bridge switch KD1 and the grounding resistor R 1 ; Wherein, the output terminal of the grounding transformer is connected t...

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Abstract

The invention discloses a substation small resistor grounding device and a control method thereof. The device comprises a grounding transformer, a neutral point small resistor, a first split-phase switch, a second split-phase switch, a third split-phase switch, a bridging switch and a grounding resistor. The output end of the grounding transformer is connected with one end of the neutral point small resistor, and the other end of the neutral point small resistor is grounded; the first phase input end of the grounding transformer is connected with one end of the first split-phase switch, the second phase input end is connected with one end of the second split-phase switch, and the third phase input end is connected with one end of the third split-phase switch; the other end of the first split-phase switch, the other end of the second split-phase switch and the other end of the third split-phase switch are respectively connected with one end of the grounding resistor, and the other end of the grounding resistor is grounded; one end of the bridging switch is connected with one end of the neutral point small resistor, and the other end is connected with one end of the grounding resistor. According to the invention, most of instantaneous faults can be eliminated, and the tripping rate of a single-phase earth fault is reduced.

Description

technical field [0001] The invention relates to the technical field of neutral point grounding of a power distribution network, in particular to a substation small resistance grounding device and a control method thereof. Background technique [0002] With the continuous development of the power grid system, the neutral point of the 10kV-35kV side of the substation is gradually developed, which is called the neutral point grounding operation mode through a small resistance. This grounding method can effectively reduce the magnitude of the system overvoltage and facilitate rapid isolation of faults. However, there is a zero-sequence overcurrent protection dead zone in the way that the neutral point is grounded through a small resistance, and there is still no perfect solution. [0003] In order to identify and effectively isolate the single-phase grounding fault of the neutral point through a small resistance grounding system, the main measures currently adopted are the self...

Claims

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Application Information

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IPC IPC(8): H02H7/28
CPCH02H7/28
Inventor 邹林
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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