Switchgear fault current acquisition device

Abstract

The invention provides a switchgear fault current collection device, which comprises a fault current collection and conditioning circuit, a normal steady-state current collection and conditioning circuit, a high-speed sampling circuit, a dynamic fault current threshold setting and fault current collection and startup judgment module, a single-chip microcontroller, a bus and a bus control module. The high-speed sampling circuit is connected with the fault current collection and conditioning circuit; the dynamic fault current threshold setting and fault current collection and startup judgment module is connected with the normal steady-state current collection and conditioning circuit; the single-chip microcontroller is connected between the normal steady-state current collection and conditioning circuit and the dynamic fault current threshold setting and fault current collection and startup judgment module; and the bus and the bus control module are connected between the high-speed sampling circuit and the single-chip microcontroller and are connected with the single-chip microcontroller. By adopting the device, fault current data can be collected more accurately and effectively according to the current normal current and the real-time set fault current threshold, the problems of low speed and incomplete and inaccurate data collection in collection of the switchgear fault current can be solved, and high-speed and accurate fault current collection can be achieved.

Description

technical field [0001] The invention relates to a fault detection device of an intelligent power transmission network, in particular to a fault current acquisition device of a switch cabinet. Background technique [0002] Switchgear fault detection technology has made considerable progress after years of research and development. Among them, it is a relatively novel and practical method to analyze and detect switch cabinet faults by collecting fault current waveforms, but it is based on the collected fault current data of switch cabinets, so the switch cabinet fault current acquisition device is the first choice for switch cabinet fault analysis and detection The essential. [0003] However, the current fault current acquisition method adopts the traditional current transformer, which has the problem of magnetic saturation, and it is difficult to realize a large-scale current measurement. The sensor head of the transformer is composed of an iron core, and the measurement ba...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a switch cabinet fault current acquisition device to solve the technical problems in the current fault current acquisition that it is difficult to realize large-scale current measurement, the measurement bandwidth is not enough, and the fault current sampling rate is not enough

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