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Method for detecting operation fault direction of distribution network

A technology for operating faults and direction detection, applied in fault locations, measuring devices, measuring electrical variables, etc., can solve the problems of increasing the workload of wiring and correcting angles, difficult promotion and application, electromagnetic resonance overvoltage, etc., to solve the electromagnetic resonance , Save the cost of construction investment and maintenance, the effect of small amount of calculation

Active Publication Date: 2014-11-26
ZHUHAI XJ ELECTRIC +2
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Problems solved by technology

Since there are many points to be monitored in power distribution, a large number of voltage transformers need to be installed, resulting in very high costs; the additional voltage transformers increase the workload of wiring and angle correction, and the newly added voltage transformers change the power distribution once. The electrical parameters of the network can easily lead to overvoltage problems such as electromagnetic resonance, making it difficult to popularize and apply

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  • Method for detecting operation fault direction of distribution network

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Embodiment Construction

[0016] The method for detecting the fault direction of the distribution network operation of the present invention is used to detect the direction of the fault location when the distribution network fault occurs, and can further determine the specific section where the fault is located. Refer below figure 1 The application examples of the present invention specifically describe the detection steps and principles.

[0017] In step (1), the power distribution terminals are scattered on the distribution lines to sample the current information of the switches respectively. exist figure 1 In the above, circuit breakers CB1 and CB2 are installed at both ends of the distribution line between power source 1 and power source 2, and switches FS1, FS2, ..., FS5, etc. are set between CB1 and CB2, and the circuit breakers and switches are equipped with Power distribution terminal FTU, this power distribution terminal is used to communicate with the feeder main station system, provide the...

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Abstract

The invention discloses a method for detecting an operation fault direction of a distribution network. The method includes sampling current information of switches; computing normalized angle values of the sampled current information at different moments; computing the difference delta phi of the computed normalized angle values of the current information sampled at the same moment of each two adjacent power distribution terminals; and comparing the differences delta phi with an angle comparison threshold value A, judging the differences delta phi, and the like. The method has the advantages of simplicity in principle, low computational complexity, wide application range and easiness in implementation, a voltage transformer does not need to be configured for each switch node of the distribution network, accordingly, construction investment and maintenance expense of a system are saved, and problems of electromagnetic resonance and the like caused by the additional voltage transformers of feeders are solved.

Description

technical field [0001] The invention relates to a distribution network fault detection and analysis technology, in particular to a distribution network operation fault direction detection method. Background technique [0002] Since the realization of feeder automation in the closed-loop power distribution network needs to know the power direction of each switch at the time of the fault and combine the network topology to determine the faulty section, the current power direction measurement method is the position that needs to be detected on the distribution line Install a voltage transformer / sensor, and then measure the voltage and current signals at the same time to calculate the power direction. Since there are many points to be monitored in power distribution, a large number of voltage transformers need to be installed, resulting in very high costs; the additional voltage transformers increase the workload of wiring and angle correction, and the newly added voltage transf...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08G01R19/00
CPCY04S10/522Y04S10/52
Inventor 汤定阳廖力曾祥飞
Owner ZHUHAI XJ ELECTRIC
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