Electric line fault location device

A technology for fault location and power lines, applied in fault locations, information technology support systems, etc., can solve problems such as stability being easily disturbed, achieve the effects of shortening search time, reducing labor intensity, and improving reliability

Inactive Publication Date: 2004-09-01
上海华联低压电器有限公司
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Problems solved by technology

Another example is the disclosed technical solution "Single-phase ground fault display method and instrument used in power supply line" (99122276.8) which uses the first half-wave signal of voltage and current to distinguish single-phase ground fault. State high-frequency signals, there are also problems of stability and susceptibility to interference

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  • Electric line fault location device
  • Electric line fault location device

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Embodiment Construction

[0011] Such as figure 1 As shown, a power line fault location device is characterized in that the device is composed of a voltage sensor 1, a current sensor 2, signal cables 6, 7 and a signal box 8, and a power circuit 14, a fault identification circuit 15 and a signal box 8 are set in the signal box 8. The signal indication circuit 16, the power supply circuit 14, the fault identification circuit 15 and the signal indication circuit 16 are connected to each other, three single-core high-voltage cables 3 pass through the center of the current sensor 2, and the secondary side windings 10 and 11 of the voltage sensor pass through the signal cables 6 is connected to the power supply circuit 14 and the fault identification circuit 15 in the signal box 8, and the secondary side winding of the current sensor 2 is connected to the fault identification circuit 15 in the signal box 8 through the signal cable 7.

[0012] Such as figure 1 As shown, the voltage sensor (1) is a three-core...

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Abstract

The invention a power line failure positioning device applied in light current grounding system, its character: it is composed of voltage sensor, current sensor, signal cable and signal box, there are power supply circuit, failure identification circuit and signal indicating circuit connected with one another, three single-core high voltage cable passes through the center of the current sensor, the secondary-side winding of the voltage sensor is connected to the power supply circuit and the failure identification circuit by the signal cable and that of the current sensor is directly connected to the failure identification by the signal cable. It can accurately not only justify the path of the short-circuit failure current but also the path of single-phase grounding failure current, thus settling the problem of positioning various failure line segments and branch lines.

Description

Technical field [0001] The invention relates to a power line fault location device, in particular to a device for determining a single-phase grounding section of a line in a small current grounding system. Background technique [0002] my country's 6-60KV power grid generally adopts a small-current grounding system in which the neutral point is not directly grounded. According to statistics, the failure rate of single-phase grounding is the highest. In the cable hybrid line dominated by overhead lines, the zero-sequence current value when the single-phase is grounded is also small because the capacitive current of the overhead lines is very small. Existing line fault indicator products only sample current signals and have large action values, and generally can only indicate short-circuit faults. Another example is the disclosed technical solution "Single-phase ground fault display method and instrument used in power supply line" (99122276.8) which uses the first half-wave s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCY04S10/522Y04S10/52
Inventor 陈永斐徐恭勤
Owner 上海华联低压电器有限公司
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