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Distribution network fault range-finding method

A technology of fault distance measurement and fault distance, which is applied in the direction of fault location and fault detection according to conductor type, etc. It can solve problems such as loss, wrong positioning results, signal delay, etc., and achieve the effects of shortening fault location time, high efficiency and practicability

Active Publication Date: 2017-09-19
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

Therefore, its disadvantage is that signal delay or loss of communication will lead to wrong positioning results

Method used

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Embodiment Construction

[0035] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0036] The distribution network fault distance measurement method provided by the embodiment of the present invention is based on the high-frequency information generated after the faulty system recloses to perform distribution network fault distance measurement. Specifically, after the fault occurs, the circuit breaker at the beginning of the fault area is quickly reclosed, and the high-frequency impedance value is calculated by using the transient...

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Abstract

The invention discloses a distribution network fault range-finding method, and the method comprises the steps: carrying out reclosing operation of a circuit start end circuit breaker after a fault happens, and measuring a voltage value and a current value at a high frequency after a permanent fault state; calculating the high-frequency impedance value of a circuit between a corresponding fault point under the high frequency and a measurement point according to the voltage value and the current value; and calculating and determining a fault distance according to the high-frequency impedance value of the circuit between the corresponding fault point and the measurement point and the high-frequency impedance value per unit length of the circuit under the high frequency. According to the embodiment of the invention, the method shortens the fault positioning time while guaranteeing the positioning precision of the fault, is very high in efficiency and practicality, and does not need to introduce additional equipment and signal channels.

Description

technical field [0001] The invention relates to the technical field of power system protection and control, in particular to a method for distance measurement of distribution network faults. Background technique [0002] In the power system, fast and accurate fault location is crucial to quickly restore power supply and improve the reliability of the power system. Fast and accurate fault location can reduce the influence of the fault on the entire power system, thereby improving the stability of the power system . [0003] At present, fault location methods in power systems mainly include impedance method, traveling wave method and wide area method. in: [0004] The impedance method is to use the electrical quantity information obtained from the measurement point after the fault to calculate the line impedance to the fault point to realize fault location. This method is easily affected by changes in power supply parameters and load parameters. In the case of false fault p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/086
Inventor 贾科李论宣振文李晨曦李猛王聪博
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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