Passive protection device and monitoring module and monitoring method thereof

Abstract

The invention relates to a passive protection device, and a monitoring module and a monitoring method thereof. The monitoring module comprises a connecting line, a DC bias voltage processing module and a full-wave rectification processing module. The first end of the connecting line inputs AC current; the second end of the connecting line is connected with the DC bias voltage processing module andthe full-wave rectification processing module respectively; the output end of the DC bias voltage processing module is connected with the first input end of a unipolar analog-to-digital conversion module of the passive protection device; and the output end of the full-wave rectification processing module is connected with the second input end of the unipolar analog-to-digital conversion module. On one hand, collection is performed in an AC mode; on the other hand, collection is performed in a DC mode; compared with a traditional device, a traditional analog-to-digital conversion module does not need to be improved or converted, the protection action speed is not affected, protection maloperation can be reliably prevented, and the defect that maloperation exists in a passive protection device using a unipolar AD under the condition of a low line load is overcome by adopting a low-cost scheme on the premise that the quick action of the device is not reduced.

Description

technical field [0001] The present application relates to the field of voltage stability monitoring, in particular to a passive protection device, a monitoring module and a monitoring method thereof. Background technique [0002] At present, in power systems such as relay protection equipment, power meters, industrial automation equipment and industrial automation control, most of them use digital processing and digital display. However, the original signals of these equipment such as voltage, current, pressure, temperature etc. are continuously changing analog signals, so the continuously changing analog signals must be converted into digital signals for digital processing and digital display. At present, the existing analog-to-digital converter (analog to digital, AD) is divided into unipolar analog-to-digital converter and bipolar analog-to-digital converter, and the structure of the unipolar analog-to-digital converter is relatively simple, and the price is cheap; Bipol...

AI Technical Summary

Problems solved by technology

[0005] Based on this, it is necessary to provide a passive protection device and its monitoring module and monitoring method, so as to use a low-cost solution to solve the problem of the passive protection device under the condition of low line load without reducing the quickness of the passive protection device. moving defect

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