A ceramic capacitor voltage divider type phase zero-sequence voltage sensor

Abstract

The invention provides a ceramic capacitor voltage divider type phase zero-sequence voltage sensor, comprising: two high-voltage arm capacitors, a high-voltage terminal and a low-voltage arm capacitor; the high-voltage terminal includes a terminal and a copper post; the copper post is welded under the terminal; the terminal Connect the high-voltage line; two high-voltage arm capacitors are welded on both sides of the copper column; one end of the high-voltage arm capacitor is welded on the copper column, and the other end is connected to the positive end of the low-voltage arm capacitor through a wire; the two high-voltage arm capacitors are in phase sequence The high-voltage arm capacitor and the zero-sequence high-voltage arm capacitor; the low-voltage arm capacitor is composed of multiple chip capacitors in parallel. In the invention, the phase-sequence high-voltage arm capacitors and the zero-sequence high-voltage arm capacitors welded on the copper posts are respectively connected with the low-voltage arm capacitors. The capacitance drift occurs due to changes, which improves the product accuracy, thus meeting the requirements of the phase voltage signal acquisition accuracy.

Description

technical field [0001] The invention relates to the field of monitoring, in particular to a ceramic capacitor voltage divider type phase zero-sequence voltage sensor. Background technique [0002] At present, the ceramic capacitor voltage divider type voltage sensor has the characteristics of simple manufacturing process, no tolerance, small size, etc. It is mainly used for the acquisition of zero-sequence voltage signals in the large-scale construction of the distribution network. In terms of inconsistency with the high-voltage arm capacitance, it is difficult for the ceramic capacitor voltage divider type voltage sensor to meet the accuracy requirements within the temperature variation range, so it cannot meet the accuracy requirements of the phase voltage signal acquisition. SUMMARY OF THE INVENTION [0003] The purpose of the present invention is to provide a ceramic capacitor voltage divider type phase zero-sequence voltage sensor, which can meet the precision require...

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Problems solved by technology

[0002] At present, the ceramic capacitor voltage divider voltage sensor has the characteristics of simple manufacturing process, no capacitance attenuation, and small size. It is mainly used for the collection of zero-sequence voltage signals in the large-scale construction of distribution networks. On the one hand, it is inconsistent with the capacitance of the high-voltage arm, which makes it difficult for the ceramic capacitor voltage divider voltage sensor to meet the accuracy requirements in the temperature range, so that it cannot meet the accuracy requirements for collecting phase voltage signals

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