Method for recognizing short circuit fault of power distribution network by dynamically regulating over current fixed value

A short-circuit fault, dynamic adjustment technology, applied in the fault location, measurement of electricity, measurement of electrical variables and other directions, can solve problems such as difficulty in using detection equipment and misoperation

Active Publication Date: 2011-06-01
TIANJIN HAOYUAN HUINENG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of this invention is to develop a new technology to solve the current situation that it is difficult to use the detection equipment by setting a fixed short-circuit value when detecting short-circuit faults, and at the same time solve the problem caused by the reverse power transmission of the current circuit when detecting short-circuit faults. misoperation problem, and implement it in a brand-new fault detection device

Method used

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  • Method for recognizing short circuit fault of power distribution network by dynamically regulating over current fixed value
  • Method for recognizing short circuit fault of power distribution network by dynamically regulating over current fixed value
  • Method for recognizing short circuit fault of power distribution network by dynamically regulating over current fixed value

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Embodiment Construction

[0017] The current signal of the present invention is taken from the opening CT stuck on the wire, such as figure 1 The 1 is composed of a magnetically permeable material and a coil wound on it, which can linearly convert the current signal on the power line into a voltage signal for the following logic circuit to process. figure 1 2 in it is a signal processing board, which processes and judges the current signal, converts it into a corresponding logic signal and sends it to the core logic control unit for processing. figure 1 3 in is a stepping motor, which consists of two sets of coils and a permanent magnet rotor. A fault identification plate is installed on the permanent magnet rotor. The two sets of coils are display coils and reset coils. When the indicator detects a fault When it happens, drive the display coil to attract the magnetic poles of the permanent magnet to its vicinity, causing it to be in an alarm state. When the timing is up, drive the reset coil to act, a...

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Abstract

The invention is mainly used to detect short trouble of a power line. The judging conditions mainly include: 1, a power line works normally; 2, current is over k times of the maximum load current in 24 hours; 3, fault current at least keeps 40 minutes, and the change of current amplitude values is larger than omega during the period of time; and 4, a transformer substation is tripped, and the power line is powered off. The invention mainly solves the problems of the self detection of the short trouble and unwanted operations caused by preventing reverse electric transmission of the power lineexisting in the distribution network, is applicable to various circuits, does not need to set a fixed value of the short circuit current and has the function of adaptability.

Description

Technical field: [0001] The invention belongs to distribution network fault detection technology Background technique: [0002] The short-circuit fault detection in the line is one of the main tasks of the relay protection and distribution network automation system, but the current equipment to judge the short-circuit fault has the following problems: [0003] 1. The fixed value of the line protection needs to be calculated according to the length of the line, the impedance characteristics and the characteristics of the transformer. Different lines will have different protection settings, which makes it difficult to use the detection equipment on the line, and because the ring network power supply line, When the line is reconfigured, the protection setting may change, which also makes it very inconvenient to use. [0004] 2. The increase of power cables and large motors on the line makes the distributed capacitance of the cable generate capacitive discharge pulses to the fa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/02G01R31/08
Inventor 不公告发明人
Owner TIANJIN HAOYUAN HUINENG TECH CO LTD
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