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Low-voltage grounding fault point locator and locating method

A ground fault and low-voltage technology, applied in the fault location, detecting faults according to conductor types, instruments, etc., can solve the problems of abnormal voltage, neutral line, and can not be used normally, so as to shorten the power outage area and power outage time, Improve comprehensive benefits and easy portability

Inactive Publication Date: 2019-03-22
孟小晶
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the direct grounding of the neutral point, electric shock incidents are likely to occur. In addition, due to the large resistance value of the direct grounding of the neutral point, the short-circuit current is small when the phase line is short-circuited to the ground, and in most cases is less than the rated current of the transformer. Low-voltage current-type protection such as fuses, electromagnetic air switches, etc. cannot operate correctly, resulting in the long-term existence of phase-to-ground short circuits, neutral point voltage displacement, and zero-line electrification. If it is low, it cannot be used normally, and if it is heavy, there will be an electric shock casualty accident

Method used

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Embodiment Construction

[0023] In order to deepen the understanding of the present invention, the present invention will be further described below in conjunction with the examples and accompanying drawings. The examples are only used to explain the present invention, and do not constitute a limitation to the protection scope of the present invention.

[0024] Low-voltage ground fault point finder, including test power supply and insulating rod type wireless clamp ammeter. 230V (unsteady) alternating current and a maximum current capacity of about 10A, output alternating current to the ground to find the fault point.

[0025] Such as figure 1 As shown, the test power supply includes input terminal 6, relay coil (also called contactor coil) 7, test switch 8, current limiting capacitor 9, ammeter 10, relay contact (also called contactor contact) 11, insurance unit 12 And output connection terminal 13, input connection terminal 6 is to get the connection terminal of commercial power from busbar 1, outp...

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Abstract

The invention discloses a low-voltage grounding fault point locator and a locating method. A test power supply is used for applying alternate-current voltage between a fault line and the ground whichare isolated to form current, the flow direction of current passing through a grounding point is measured by an insulating pole type wireless alternate-current clamp ammeter; then the locator gradually approaches an unknown fault point in the flow direction of current passing through the grounding point, until the low-voltage grounding fault point is found. By the method, the fault point is searched by a test power supply through municipal power in a site. Due to the current limiting effect of the test power supply, no matter field grounding adopts high resistance or low resistance, the test instrument is not damaged even if the grounding is unstable, and the accuracy of the test can be ensured.

Description

technical field [0001] The invention relates to the technical field of finding fault points in low-voltage power systems, in particular to a low-voltage ground fault point finder and a search method for low-voltage ground fault points in low-voltage distribution networks. Background technique [0002] The neutral point of the 400V low-voltage power system is directly grounded. The advantage of direct grounding is that the three phases can supply power to customers separately, which improves equipment utilization and power supply reliability. However, due to the direct grounding of the neutral point, electric shock incidents are likely to occur. In addition, due to the large resistance value of the direct grounding of the neutral point, the short-circuit current is small when the phase line is short-circuited to the ground, and in most cases is less than the rated current of the transformer. Low-voltage current-type protection such as fuses, electromagnetic air switches, etc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08G01R31/02
CPCG01R31/086G01R31/50
Inventor 孙彤彤蔡其芬孙德斌秦勇沈小建管晓杰徐鹏鹏孟小晶
Owner 孟小晶
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