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Detection and identification system and method for short-circuit current of power system

A short-circuit current and identification system technology, applied in circuit devices, emergency protection circuit devices, overcurrent protection, etc., can solve the problems of slow detection response speed, affecting signal recognition time, etc., and achieve strong anti-electromagnetic interference ability Effect

Inactive Publication Date: 2018-11-09
国网黑龙江省电力有限公司齐齐哈尔供电公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the existing identification method will affect the identification time of the signal and the detection reaction speed is slow, and provide a fast detection and identification, accurate detection and identification system and detection and identification method for short-circuit current of the power system

Method used

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  • Detection and identification system and method for short-circuit current of power system
  • Detection and identification system and method for short-circuit current of power system

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Embodiment 1

[0031] A power system short-circuit current detection and identification system, comprising: a power supply module and a sensing module, the sensing module is respectively electrically connected with a group of primary current transformers, a power supply module and a control module, the control module is connected to The liquid crystal display is electrically connected to the power module;

[0032] The sensing module includes a set of secondary current transformers correspondingly connected with the primary current transformers, the secondary current transformers are electrically connected with the A / D sampler, and the A / D sampling The NOR gate and the NOR gate are electrically connected through the comparator. The primary current transformer and the secondary current transformer can convert the high current signal on the power line into a voltage signal suitable for the use of the operational amplifier. The voltage signal is proportional to the high current signal. The ratio...

Embodiment 2

[0034] According to the power system short-circuit current detection and identification system according to Embodiment 1, the power module includes a transformer, the transformer is electrically connected to the AC filter, the AC filter is electrically connected to the rectifier bridge, and the rectifier The bridge is electrically connected to the DC / DC power circuit.

Embodiment 3

[0036] According to the power system short-circuit current detection and identification system according to Embodiment 1 or 2, one output end of the DC / DC power supply circuit outputs 12 VDC, and the other output end is electrically connected to the DC filter circuit, and the DC filter circuit outputs 5VDC, of ​​which ±12V powers the sensing module, and 5V powers the control module.

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Abstract

The invention discloses a detection and identification system and method for the short-circuit current of a power system. The detection and identification system and method solve the problem that in an existing identification method, the identification time of short-circuit current signals can be influenced, and the detection response speed is low. The system comprises a power supply module and asensing module, the sensing module is electrically connected to one group of primary current transformers, the power supply module and a control module, the control module is electrically connected toa liquid crystal display and the power supply module, the sensing module comprises a group of secondary current transformers which are correspondingly connected to the primary current transformers, the secondary current transformers are electrically connected to A / D samplers, and the A / D samplers are electrically connected to NOR gates through comparators. The system and the method are used for detection and identification of the short-circuit current of the power system.

Description

Technical field: [0001] The invention relates to the technical field of power system detection, and in particular to a power system short-circuit current detection and identification system and a detection and identification method. Background technique: [0002] When an abnormal connection occurs between phases or between phases and ground in a power system in operation, a short circuit often occurs, and the loop current may exceed the rated current of the loop many times, thus causing damage to the power system. In order to ensure the safety of the power system, when this situation occurs, the short-circuit fault part should be removed as soon as possible. For this reason, measures to detect, identify and limit the short-circuit current can be adopted. Existing identification methods are mainly divided into two categories: software and hardware. The software implementation needs to go through a series of steps such as sampling, conversion and filtering, so it will directl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H1/00H02H3/08
Inventor 孙杰李欣孙毅靳方明李学忠高金昊倪丹郭文浩高媛高宇赵越赵士鑫王丰年
Owner 国网黑龙江省电力有限公司齐齐哈尔供电公司
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