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Cable line fault isolation method, device and system

A fault isolation and cable line technology, applied in the field of electric power, can solve problems such as power outages, failure to locate fault points, and large affected areas, and achieve the effect of reducing power outage areas

Inactive Publication Date: 2015-04-29
STATE GRID XIANGSHAN POWER SUPPLY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the current technology, when a single-phase ground fault occurs on the load side of the power system, the specific fault point cannot be located, only the distribution line can be located. Therefore, once a single-phase ground fault occurs on the load side, only by jumping out The faulty line is cut off by means of a line switch, so that all the lines are powered off, and the affected area is relatively large

Method used

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  • Cable line fault isolation method, device and system
  • Cable line fault isolation method, device and system
  • Cable line fault isolation method, device and system

Examples

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Embodiment 1

[0042] see figure 1 , figure 1 It is a flow chart of a cable line fault isolation method provided by an embodiment of the present invention. Such as figure 1 As shown, the method includes:

[0043] Step S101, obtaining the zero-sequence current at the load side;

[0044] Specifically, the zero-sequence current on the load side is obtained through a zero-sequence current transformer.

[0045] Further, before obtaining the zero-sequence current, it also includes:

[0046] Control the zero-sequence current transformer to detect the zero-sequence current on the load side.

[0047] Step S102, judging whether the zero-sequence current exceeds a preset zero-sequence current value interval;

[0048] Specifically, the preset zero-sequence current value interval is optional, and is (i1~i2), wherein, i1 is the minimum value of the preset zero-sequence current value interval, and i2 is the preset zero-sequence current value interval maximum value. Execute the step S102 to obtain a...

Embodiment 2

[0054] see figure 2 , figure 2 It is a flow chart of another cable line fault isolation method provided by the embodiment of the present invention. Such as figure 2 As shown, the method includes:

[0055] Step S201, obtaining the zero-sequence current at the load side;

[0056] Step S202, judging whether the zero-sequence current exceeds a preset zero-sequence current value range;

[0057] Specifically, if yes, execute the steps S203, S204 and S205 in sequence; if no, return to the step S201;

[0058] Step S203, controlling the intelligent boundary switch on the load side to be turned off;

[0059] Step S204, controlling the communication module to send fault information to the preset mobile terminal and the distribution network server;

[0060] Specifically, the fault information includes position information and state information of the intelligent boundary switch; the position information of the intelligent boundary switch can represent the specific position of the...

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Abstract

The invention discloses a cable line fault isolation method, device and system. The method includes the steps of obtaining the zero-sequence current on the load side, judging whether the zero-sequence current exceeds a preset zero-sequence current value section or not, and controlling an intelligent dividing switch on the load side to be turned off if the zero-sequence current exceeds the preset zero-sequence current value section. According to the technical scheme, when the certain load side fails, only the intelligent dividing switch on the fault load side needs to be turned off, a circuit switch does not need to be turned off, and the power outrage area can be effectively narrowed.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a cable line fault isolation method, device and system. Background technique [0002] Electricity is an energy source powered by electrical energy. Electricity was invented in the 1870s. The invention and application of electricity set off the second industrialization upsurge and became one of the three scientific and technological revolutions in the world since the 18th century. Since then, technology has changed people's lives more rapidly. The large-scale power system that appeared in the 20th century is one of the most important achievements in the history of human engineering science. It is a power production and consumption system composed of power generation, power transmission, power transformation, power distribution and power consumption. It is converted into electricity through mechanical energy devices, and then supplied to various users through power transmi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26
Inventor 史斌吴仁光章政胡友定李凯鹏金磊
Owner STATE GRID XIANGSHAN POWER SUPPLY
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