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System and method for detecting fault of power distribution network

A technology of distribution network fault and detection system, applied in the fault location and other directions, can solve equipment and load impact, affect the reliability and safety of the line, cannot achieve rapid judgment and isolation of fault areas, and quickly restore power supply in non-fault areas, etc. problem, to achieve the effect of reducing the number of movements and reducing the impact

Active Publication Date: 2015-03-25
NANJING INTELLIGENT APP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For a power distribution network with two or more complex structures, using traditional reclosers to locate and isolate faults requires repeated reclosing of reclosers and substation outlet switches, which cannot quickly locate the fault area. Judgment, isolation and fast restoration of power to non-faulty areas
The repeated reclosing of the recloser will not only affect the mechanical life of the recloser itself, but also bring great impact to other equipment and loads in the line, affecting the reliability and safety of the line

Method used

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  • System and method for detecting fault of power distribution network
  • System and method for detecting fault of power distribution network
  • System and method for detecting fault of power distribution network

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] control figure 1 , the distribution network fault detection system of the present invention includes a recloser CH arranged on the distribution network, and a recloser drive module M C , used to monitor the core control unit CPU of the distribution network, the transformers PT1, PT2, and the corresponding pulse signal input drive module M of the transformer 1 , M 1 And voltage sensors L1, L2. The two ends of the recloser D are respectively connected to a transformer PT1 (or PT2) and a voltage sensor L1 (or L2), and the transformers PT1 and PT2 at both ends of the recloser CH are connected to the core control unit CPU through the corresponding drive modules M1 and M2 , the recloser CH passes through the corresponding drive module M C It is connected with the core control unit CPU.

[0022] control figure 2 , the driving module M1 or M2 (the dotted box part) is mainly composed of four high-power semiconductor field-effect transistors (MOSFET) 2a on the two diagonal ...

Embodiment 2

[0026] The present invention is further used in 10kV power distribution lines to realize rapid fault handling, please refer to Figure 5 , CB1 and CB2 in the line are substation outlet switches, CH1, CH2, CH3, CH4, CH5, and CH6 are reclosers in the present invention (the transformers, voltage sensors, and corresponding drive modules corresponding to each recloser are omitted and not shown) , K1 is a contact switch (open when there is no fault in the line, and close when one side loses voltage and detects no fault). The black switch in the figure indicates that the switch is closed, and the white switch indicates that the switch is open.

[0027] Figure 5 When a short-circuit fault occurs at point A, the switches CB1, CH1, and CH5 in the line detect the fault signal and open, CH2 opens due to voltage loss, and the delay timing of the contact switch starts. Switches CH1, CH2, and CH5 all use this inventive method to inject power pulse signals to both sides of the recloser. Af...

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Abstract

The invention relates to a system and method for detecting fault of a power distribution network. The system comprises a core control unit, a superposition device, a mutual inductor, and a voltage sensor, wherein the core control unit is used for monitoring the power distribution network, the superposition device is arranged on the power distribution network and is connected with the core control unit, the mutual inductor and the voltage sensor are respectively connected with the two ends of the superposition device and are connected with a power supply, and the mutual inductor is connected with the core control unit through a corresponding driving module. The method for detecting the fault of the power distribution network comprises the following steps that: when a line of the power distribution network has failure, the core control unit injects a power pulse signal through a winding of a secondary winding of the mutual inductor, and the voltage sensor is used for detecting a corresponding voltage signal of a corresponding line according to a power pulse signal during delayed period of the superposition device and carrying out failure judgment according to a detection signal, wherein the superposition device is locked when the corresponding line has failure, and the superposition device is automatically switched on during the delayed period when the corresponding line does not have failure. The system and method for detecting the fault of the power distribution network, disclosed by the invention, have the advantages that the isolation on the fault and the power restoration of a non-failure area can be finished through once switching on.

Description

technical field [0001] The invention relates to the technical field of distribution lines, in particular to a distribution network fault detection system and detection method. Background technique [0002] With the continuous deepening of my country's power grid reform, higher requirements are put forward for the reliability and safety of power supply. method is particularly important. The fault handling of the distribution network requires the use of feeder automation or distribution automation technology to achieve rapid fault reporting, rapid diagnosis, rapid positioning, rapid isolation and rapid recovery, and to achieve rapid self-healing of the distribution network. Feeder automation refers to the automation of feeder lines between substation outlets and consumer electrical equipment, mainly referring to fault location, fault detection, fault isolation, and restoration of power supply in non-faulty areas. For a power distribution network with two or more complex s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
Inventor 林莘杜仁伟王博刘洋童利琴
Owner NANJING INTELLIGENT APP