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Transient fault power direction based medium voltage bus protection method

A power direction, instantaneous fault technology, applied in the direction of automatic disconnection of emergency protection devices, emergency protection circuit devices, electrical components, etc., to achieve the effect of not increasing the hardware cost

Inactive Publication Date: 2008-01-02
CHONGQING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a medium-voltage busbar protection method based on the instantaneous fault power direction, which can effectively solve the problem of correctly obtaining the fault power direction within the 5ms data interval, and effectively determine the fault inside and outside the busbar area

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  • Transient fault power direction based medium voltage bus protection method
  • Transient fault power direction based medium voltage bus protection method
  • Transient fault power direction based medium voltage bus protection method

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Embodiment Construction

[0035] specific implementation plan

[0036] Specific embodiments of the present invention are described in detail below:

[0037] 1. The three-phase current analog signal i from the secondary coil of each circuit current transformer on the busbar An , i Bn , i Cn and the three-phase voltage analog signal v from the secondary coil of the voltage transformer on the bus An , v Bn , v Cn , access the low-pass filter circuit (11) of each loop, the current and voltage analog signal after the low-pass filter circuit (11) process is sent into the frequency-locked phase-locked sampling module (12), from the frequency-locked phase-locked sampling module (12 ) output current and voltage digital signal i' An , i' Bn , i' Cn , v' An , v' Bn , v' Cn It is used for the fault start module (2) and the instantaneous fault power direction calculation module (4).

[0038] 2. The fault start module (2) is composed of an adaptive fault pre-start module (21) and a fault start determinat...

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Abstract

The invention relates to a middle-voltage bus protect method based on instant accident power direction, characterized in composed of 1, synchronous sampling, 2, accident start, 3, accident type charge, 4, instant accident power direction judgment, 5, internal and external accident judgment of bus area. The invention uses the instant accident power direction calculated in 5ms time region to realize middle-voltage bus protection, without affected by saturated current sensor. The invention calculates instant accident power direction according to phase, to apply the condition of two-point two-phase earth connection. And the invention can use the hardware resources of prior circuit protective unit and central communication unit, and add a software function module to realize middle-voltage bus protection without additional hardware cost.

Description

technical field [0001] The invention relates to a method for protecting a busbar in a power system, in particular to a method for protecting a medium-voltage busbar based on the direction of instantaneous fault power. Background technique [0002] Existing busbar protection is usually a centralized current differential protection, which has complex devices, many connections and high cost. For medium-voltage (35kV, 10kV, 6kV) buses with many outgoing lines and low importance, it is not economically appropriate to configure centralized current differential protection. Recently, a medium voltage busbar protection method based on fault power direction has been proposed. According to comparative analysis of literature, when the medium-voltage bus has an out-of-area fault, the current transformer on the fault line is easily saturated, and the saturation time of the current transformer is about 5ms, that is, the effective data interval for correctly calculating the fault power dir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/22H02H3/26
Inventor 罗建黄林李亚军杨浩曾清陈刚高家志张继红
Owner CHONGQING UNIV