Hoop voltage sensing device

Abstract

The invention discloses a hoop voltage sensing device. The hoop voltage sensing device comprises an incoming and outgoing line casing pipe, the incoming and outgoing line casing pipe comprises an epoxy insulator, the epoxy insulator is of a hollow structure from top to bottom, a conducting rod is installed in the hollow structure, hoop high-voltage capacitors are installed at the solid portions on the two sides of the part, not the hollow structure, of the epoxy insulator, the hoop high-voltage capacitors are electrically connected with the conducting rod, the adjacent outer side of one of the hoop high-voltage capacitors is provided with a lead end installed in the solid portion of the epoxy insulator, the lead end is provided with an electric lead connected with the hoop high-voltage capacitors, the other end of the electric lead is connected with a low-voltage capacitor device, and the low-voltage capacitor device is connected with a signal processing module connected with a control unit of a switchgear. The hoop voltage sensing device is small in space occupation, influence on electric field distribution in an original environment of an electrical element is small, the measurement precision is high, the temperature and frequency features are good, and the cost is low.

Description

technical field [0001] The invention relates to a voltage sensing device in a switchgear, in particular to a ring voltage sensing device. Background technique [0002] In the construction process of distribution network automation, switchgear is gradually required to integrate more sensing and measuring components so that switchgear can achieve more useful functions. It has become the future development direction for the equipment to replace the voltage transformer with a more compact and high-precision voltage sensing device as the voltage sensing and measuring element. [0003] In the field of distribution network, there are two types of voltage sensing devices: resistive voltage divider and capacitive voltage divider. Among them, the voltage sensing device of the capacitive voltage division type has simple structure, better safety, low production cost, and has wider application prospects. There are mainly two types of high-voltage capacitors for voltage sensing devices ...

AI Technical Summary

Problems solved by technology

[0004] However, the resistor divider or the prefabricated capacitive divider voltage sensing device adopts a solid structure, which can only be integrated with the support of the switchgear or the moving insulating part during application, and cannot be conveniently integrated with the necessary current conduction of the switchgear. Passing components (such as high-voltage bushings, vacuum interrupters, etc.) are integrated together, occupying a lot of space, the application range is relatively limited, the original electric field distribution is greatly affected, and the overall cost is high

Due to the instability of the dielectric constant of the plate material and the large processing error of the induction network type capacitive voltage sensing device, the capacitance parameters are difficult to control, and are easily affected by factors such as temperature and frequency, resulting in drastic changes, resulting in voltage measurement accuracy very bad

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