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Low-voltage comprehensive protector and method for acquiring ground fault position from the low-voltage comprehensive protector

A technology of integrated protector and ground fault, which is applied in the direction of instruments, measuring devices, measuring electricity, etc., can solve the problems of complex laying conditions on site, difficulty in finding fault points, etc., and achieve the effect of fast and accurate positioning

Pending Publication Date: 2019-07-19
SINOPEC NANJING ENG & CONSTR +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the project, the grounding fault on the cable line of the low-voltage power distribution system occurs from time to time. Due to the long distribution cable line and the complicated laying situation on site, it is not easy to find the fault point after a fault occurs

Method used

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  • Low-voltage comprehensive protector and method for acquiring ground fault position from the low-voltage comprehensive protector
  • Low-voltage comprehensive protector and method for acquiring ground fault position from the low-voltage comprehensive protector
  • Low-voltage comprehensive protector and method for acquiring ground fault position from the low-voltage comprehensive protector

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with embodiment, but protection scope of the present invention is not limited to this:

[0029] Such as figure 1 As shown, enter the specifications of the cable line in the low-voltage integrated protector, that is, the resistance of the phase line and the resistance of the PE line. After the input is completed, according to the formulas (1) to (2) for calculating the single-phase ground fault short-circuit current, calculate the short-circuit current I when the end of the line is short-circuited" k .

[0030]

[0031] R php =(R ph' +R p' )×L (2)

[0032] Because the reactance value of the low-voltage line is very small, it can be ignored.

[0033] In the formula: U n --------------Nominal voltage of the system (V)

[0034] R php -------------Line phase line and protection line resistance (Ω)

[0035] R ph' ------------- Unit resistance of line phase wire (Ω / m)

[0036] R p' -----------...

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Abstract

The invention discloses a low-voltage comprehensive protector and a method for acquiring a ground fault position from the low-voltage comprehensive protector. The present invention discloses a low-voltage comprehensive protector. The low-voltage comprehensive protector comprises a detection module of a short-circuit current when a single-phase ground fault is generated, and a calculation module ofa ground fault position, and the calculation module of the ground fault position comprises a storage module of a unit impedance value of a cable circuit and a calculation module of a ground fault distance. In the operation process, when the middle portion of the circuit generates a ground fault, the distance from the ground fault point to the comprehensive protector is calculated according to thedetected short-circuit current. On the basis without extra addition of the investment, the current devices and the conditions are employed to rapidly and accurately locate fault points.

Description

technical field [0001] The invention belongs to the improvement of an electrical control method, and in particular relates to a method for obtaining a ground fault location from a comprehensive protector. Background technique [0002] In the project, the grounding fault on the cable line of the low-voltage power distribution system occurs from time to time. Due to the long distribution cable line and the complicated laying situation on site, it is not easy to find the fault point after a fault occurs. Contents of the invention [0003] In view of the problems existing in the background technology, the present invention adopts a low-voltage integrated protector to protect the motor and the feeder circuit in consideration of most projects. When a short circuit occurs, the integrated protector can detect the short-circuit current when a ground fault occurs , so the present invention is aimed at the low-voltage TN-S system, and proposes a new function integrated in the low-vol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02
CPCG01R31/50
Inventor 王建军李英伟许锴
Owner SINOPEC NANJING ENG & CONSTR