Grounding fault identification and grounding line selection method based on zero-sequence current resistive component

A zero-sequence current and grounding fault technology, applied in the fault location, detecting faults by conductor type, short-circuit testing, etc., can solve the problems of inability to select faulty lines, difficult identification and processing of high-resistance grounding faults, etc., to improve high-resistance Recognition and processing ability, easy to identify faulty lines, easy to implement effect

Inactive Publication Date: 2020-05-12
李景禄
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Problems solved by technology

However, in an asymmetric power grid, under the action of asymmetric voltage, there will be asymmetric current in the feeder during normal operation of the power grid. Due to the different asymmetric parameters of each feeder, the distribution of asymmetric current in each feeder is also different, which is It will cause great difficulties in the identification and treatment of high-resistance ground faults, and the fault line cannot be selected

Method used

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  • Grounding fault identification and grounding line selection method based on zero-sequence current resistive component

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Embodiment Construction

[0012] The device consists of a grounding transformer, a neutral point resistor R, and a resistor control switch QF 1 , Neutral point voltage transformer TV 0 And computer controller M form. When the distribution network is running normally, through the neutral point voltage transformer TV 0 Real-time collection of distribution network neutral point displacement voltage U N , the zero-sequence current I of each feeder is collected in real time through the zero-sequence current transformer installed on each feeder i01 , when the increment ΔU of the neutral point displacement voltage of the distribution network N ≥δ 1 , check the amplitude I of the zero-sequence current of each feeder i02 , and the zero-sequence current I of each feeder i0 and neutral point displacement voltage U N The phase angle φ between them, calculate the resistive current component I of the zero-sequence current of each feeder Ri = I i0 cosφ, when the increment ΔI of the resistive component of the...

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Abstract

In order to solve the problem of high-resistance grounding identification and processing of an asymmetric power grid, the invention provides a grounding fault identification and grounding line selection method based on a zero-sequence current resistive component. The resistive current is generated in a fault loop through the compensation damping resistor. According to the method for detecting andcalculating the zero-sequence current resistive component and increment of each feeder line when the power distribution network breaks down, the influence of asymmetric current in the power distribution network in the feeder lines on recognition and line selection of a grounding fault is eliminated, so that the high-resistance recognition and processing capacity of the asymmetric power grid is improved. Particularly, the grounding line selection accuracy of the asymmetric power distribution network is improved.

Description

technical field [0001] The invention relates to the field of single-phase grounding fault processing of distribution network, and is for the identification and grounding line selection of single-phase grounding fault of distribution network. Background technique [0002] When a single-phase ground fault occurs in the distribution network, since the single-phase ground fault occurs in the distribution network, the voltage of the three-phase circuit line remains unchanged, which has little effect on the normal power supply, and it can operate with faults, which is beneficial to improving the reliability of the power supply of the power grid. However, if the grounding current is large and the single-phase grounding arc continues to burn, an arc grounding overvoltage will occur, or due to the thermal ionization and photoionization of the arc, it will damage the insulation of the surrounding air and develop into a phase-to-phase short circuit accident. In addition, if a single-ph...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08G01R31/52
CPCG01R31/086
Inventor 李政洋李景禄
Owner 李景禄
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