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

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...

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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

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