Voltage sensor for high and medium voltage use and a method of making the same

Abstract

A voltage sensor is disclosed for high and medium voltage use, wherein a voltage divider is arranged in a housing with external creepage distance enlarging ribs. To implement structures for creepage path enlargement to a sensor housing in a very effective and easy way, the voltage divider is arranged in a housing or in housing modules which is or are covered at least partly by at least one shrinking tube of insulating material such that the shrinking creepage enlarging structures are implemented at least at outer surface of the shrinking tube.

Description

RELATED APPLICATION[0001]This application claims priority under 35 U.S.C. §119 to European Patent Application No. 14001838.3 filed in Europe on May 27, 2014, the entire content of which is hereby incorporated by reference in its entirety.FIELD[0002]The present disclosure relates to a voltage sensor for high and medium voltage use, and a method of making the same.BACKGROUND INFORMATION[0003]Known voltage sensors use an impedance divider cast in some insulation material (epoxy or polyurethane) in order to withstand voltage stresses on MV or HV lines. This solution is expensive and involves investment into a complex mold for casting, such as when the requirement of creepage distance is of importance and ribs on the sensor body are used to achieve given creepage distance, such as in FIG. 1.SUMMARY[0004]A voltage sensor for high and medium voltage use is disclosed, comprising: a voltage divider arranged in a housing or housing modules with external shrinking creepage distance enlarging s...

AI Technical Summary

Benefits of technology

This patent addresses a solution to reduce manufacturing time and costs of a voltage divider module used in electrical equipment. The solution involves using a standard shrinking tube with sheds that is placed around a voltage divider module. This reduces the need for expensive mold tools and sensors. The shrinking tube can be placed on the housing or over the output cable of the voltage sensor, and a creepage distance enlargement can be implemented at the transition area between the housing and the output cable. The voltage sensor can be located within or surrounded by shielding electrodes, and the insulation is done by using insulating material, such as epoxy or polyurethane. The insulating shrinking tube can be provided as a cold or warm shrink tube, depending on the application. The patent provides a simple and effective way to implement creepage distance enlargation on the sensor's housing or cable.

Problems solved by technology

This solution is expensive and involves investment into a complex mold for casting, such as when the requirement of creepage distance is of importance and ribs on the sensor body are used to achieve given creepage distance, such as in FIG. 1.

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