Power distribution network fault locating system and method
A distribution network fault and positioning system technology, applied in the direction of fault location, information technology support system, etc., can solve problems such as difficulties, high costs, inconvenient line operation and maintenance, and achieve reduced workload, high judgment accuracy, and strong practicality The effect of applying the effect
Inactive Publication Date: 2014-06-04
STATE GRID CORP OF CHINA +1
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Problems solved by technology
For distribution lines, the acquisition of zero-sequence voltage parameters requires the installation of zero-sequence transformers, and the distribution network has many branches, so it is very difficult to install zero-sequence voltage transformers at each fault detection point, and the cost is also very high, which is not convenient for the line operation and maintenance
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[0041] The present invention will be further described below in conjunction with the drawings and embodiments:
[0042] The present invention proposes a new distribution network fault location system and method. The principle is that when a single-phase ground fault occurs in the line, the transient zero sequence current of the faulted line and the transient zero sequence voltage have opposite polarities, and the lag is zero. The sequence voltage is 90 degrees; the transient zero sequence current of the non-faulty line has the same polarity as the transient zero sequence voltage, and the zero sequence voltage is 90 degrees ahead.
[0043] The calculation result of the substation terminal 1 is transmitted to each line terminal 2, so that each line terminal 2 obtains the direction data 0 or 1 of the transient zero sequence current and the transient zero sequence voltage at the same time. This direction data is related to the zero sequence voltage and current. The polarity is correspo...
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The invention discloses a power distribution network fault locating system and method. The system comprises a transformer substation terminal, a plurality of line terminals and a main station. The transformer substation terminal is installed on a bus and used for detecting transient state zero sequence voltages, judging the directions of the transient state zero sequence voltages and transmitting detection results to the main station. The line terminals are installed on various branch circuits of a power distribution network and used for detecting transient state zero sequence currents, judging the directions of the transient state zero sequence currents and sending detection results to the main station. The main station is used for comparing the received transient state zero sequence voltages and the directions of the transient zero sequence currents to determine the grounding fault line section; the transformer substation terminal and the line terminals are in wireless communication with the main station respectively. The power distribution network fault locating system and method are high in fault locating judging accuracy, and are applicable to power distribution networks with different neutral point grounding modes; the line terminals installed on all the branch circuits are simple and convenient to install, only a zero sequence mutual inductor and a communication device need to be installed and the power-off time is short.
Description
Technical field [0001] The present invention relates to the technical field of power ground fault detection, in particular to a distribution network fault location system based on the sudden change direction of zero-sequence voltage and zero-sequence current. It is suitable for 3~60kV neutral point non-effectively grounded power grids and can be grounded in single phase. When a fault occurs, accurately locate the ground fault. Background technique [0002] my country's 3~60kV power distribution network widely adopts neutral point non-effective grounding method, which is divided into neutral point ungrounded and neutral point grounded via arc suppression coil. Most of the faults of neutral point ineffective grounding system are single Phase to ground fault. When a single-phase ground fault occurs, the ground current is very small, and it can continue to operate for 1 to 2 hours under the fault condition, but the fault point must be found as soon as possible to prevent the live pow...
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IPC IPC(8): G01R31/08
CPCY04S10/52
Inventor 李建修李立生邵志敏孙勇张世栋
Owner STATE GRID CORP OF CHINA