Voltage sensor

Abstract

The present invention relates to a voltage transducer, which is characterized by that it includes a capacitive divider formed of insulating shell body, high-voltage end, grounding end, series-connected capacitors of C1 and C2 and oil-free dry packing layer, in which the C1 and C2 are respectively formed of several separate metallized film capacitors which are series-parallel connected, and a secondary voltage end is led out from connected place of C1 and C2, and is parallel-connected with a reactance transformer including mounting frame and two up-and-down oppositely-arranged "C" type iron cores on which the primary reactance winding coil and secondary transformer winding coil are winded, at the same time an overvoltage protector is parallel connected between the secondary voltage end andgrounding end.

Description

technical field [0001] The invention relates to the field of high-voltage electrical appliances, in particular to a sensing mechanism for obtaining a secondary voltage source from a 10KV high-voltage power supply. Background technique [0002] The voltage sensor is used in the 10KV distribution network, which is a way to convert the 10KV power supply into 220 The current voltage transformers are all iron-core multi-coil winding transformers, which have poor insulation performance, large volume, and high cost. They are especially not suitable for outdoor use and cannot be used as high-voltage electrical appliances. insulator applications. High-voltage capacitive voltage transformers at home and abroad commonly use concentric circle capacitance screen type or one-section to multi-section bushing type coupling capacitors. Both concentric circle capacitance screens and bushing type coupling capacitors are film-paper composite media and require vacuum treatment and heat treatme...

AI Technical Summary

Problems solved by technology

[0002] The voltage sensor is used in the 10KV distribution network, which is a way to convert the 10KV power supply into 220 The current voltage transformers are all iron-core multi-coil winding transformers, which have poor insulation performance, large volume, and high cost. They are especially not suitable for outdoor use and cannot be used as high-voltage electrical appliances. insulator application

High-voltage capacitive voltage transformers at home and abroad commonly use concentric circle capacitance screen type or one-section to multi-section bushing type coupling capacitors. Both concentric circle capacitance screens and bushing type coupling capacitors are film-paper composite media and require vacuum treatment and heat treatment. Refill with dehydrated and degassed insulating oil (dodecylbenzene oil) to seal. The production process is complicated, difficult to control, bulky and costly. It is not suitable for application on 10KV power grids, and is limited to ultra-high voltage power grids.

The Chinese Patent Office disclosed the technology of "a new type of dry-type voltage transformer" with the patent No. 99255044.0. Its internal structure is to use concentric circle capacitive screens and fix them on tubular electrodes. Due to structural limitations, it is difficult for the voltage transformer to output relatively high voltage. High current, and the output current fluctuates due to the influence of the primary current. Even if a power amplifier is configured in the application, it can only drive a voltmeter or a relay protection to provide a voltage source. Its internal capacitive screen is difficult to wind and difficult to manufacture. It is even more impossible to obtain the secondary power required by the secondary operating mechanism and automatic control of the distribution network on the 10KV power grid

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