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Transient fault power direction based medium voltage bus protection method

A technology of power direction and instantaneous fault, applied in the direction of automatic disconnection emergency protection device, emergency protection circuit device, electrical components, etc., to achieve the effect of no increase in hardware cost

Inactive Publication Date: 2009-09-09
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 , connected to the low-pass filter circuit 11 of each loop, the current and voltage analog signal processed by the low-pass filter circuit 11 enters the frequency-locked and phase-locked sampling module 12, and the current and voltage digital signal output from the frequency-locked and phase-locked sampling module 12 i' An , i' Bn , i' Cn , v' An , v' Bn , v' Cn It is used in the fault starting 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 medium-voltage busbar protection method based on instantaneous fault power direction, which is characterized in that the method includes: 1. Synchronous sampling; 2. Fault start; 3. Fault category judgment; 4. Instantaneous fault power direction judgment; 5. Fault determination inside and outside the busbar area. This method adopts the instantaneous fault power direction obtained in the 5ms time interval to realize the protection of the medium voltage busbar, and is not affected by the saturation of the current transformer; this method obtains the instantaneous fault power direction according to the phase, which can adapt to the two-point two-phase ground fault and use the hardware resources of the existing line protection unit and the central communication unit to add software function modules to realize medium-voltage busbar protection without increasing the 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...

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Application Information

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Patent Type & Authority Patents(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刘先珊
Owner CHONGQING UNIV