Digital voltage sensor for ring main unit

Abstract

A digital voltage sensor for a ring main unit comprises an input port, a high-voltage fuse, a high-voltage capacitive voltage divider, an interphase electricity taking voltage transformer, a voltage dividing isolation transformer and a digital module, wherein the input port, the high-voltage fuse, the high-voltage capacitive voltage divider and a grounding end are sequentially connected in series. The high-voltage capacitive voltage divider is connected with the voltage-dividing isolation transformer of each phase, and the voltage-dividing isolation transformer is connected with the digital module; the digital module can convert a voltage signal input by the measuring port into a digital quantity and transmit the digital quantity, and the interphase electricity taking voltage transformer is connected between the high-voltage fuse and the high-voltage capacitive voltage divider, According to the invention, the obtained high-voltage voltage signal can be subjected to voltage division to obtain a secondary voltage signal, and the secondary voltage signal is converted into a digital signal, so that the transmission of digital quantity is realized, and the isolation of primary and secondary electrical equipment is realized.

Description

technical field [0001] The invention relates to the technical field of electronic metering devices for ring network cabinets, in particular to a digital voltage sensor for ring network cabinets. Background technique [0002] Electric power is a basic industry related to the national economy and the people's livelihood. It is related to the overall situation of national strategic security and economic and social development. During the operation of the power system, the accuracy and timeliness of fault diagnosis are of positive significance to ensure the safety and stability of the power system. At present, in the process of power system fault diagnosis, it is first necessary to collect system operating data, such as voltage, current, frequency, power, etc. In the traditional collection process, it is mainly applied to electromagnetic sensors, due to the existence of magnetic saturation, ferromagnetic There are many shortcomings such as resonance, small dynamic range and narr...

AI Technical Summary

Problems solved by technology

At present, the output voltage signal measurement range of the small signal voltage sensor commonly used in the distribution network is 1V ~ 3V, and the electromagnetic interference in the 10kV system is relatively serious. These interferences are easy to be superimposed on this weak voltage and small signal, which will not only bring measurement errors. , and may cause the protection system to malfunction

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