Coupling capacitive voltage divider with electric potential gradient shielding

Abstract

The invention provides a coupling capacitive voltage divider with electric potential gradient shielding. The coupling capacitive voltage divider comprises a high voltage terminal shielding ring, an upper flange, a device body, a base and a connecting box. The high voltage terminal shielding ring is located at the top of the device body and is connected with the device body through the upper flange, the bottom of the device body is fixed to the base, and the connecting box is arranged on the base. On the basis that the capacitance of the coupling capacitive voltage divider is reduced, the intrinsic standoff ratio of the voltage divider is not affected by external objects and electric fields. The coupling capacitive voltage divider with electric potential gradient shielding can be used as a coupling capacitor to be used for EVT and to be used for improving the transient process withstanding capacity of an EVT secondary system; the coupling capacitive voltage divider with electric potential gradient shielding can also be used as a supporting insulator with the function of the voltage divider to be used for monitoring transformer substation voltage and measuring power grid transient state overvoltage, and used for primary voltage monitoring of transformer substation and circuit system debugging. The coupling capacitive voltage divider with electric potential gradient shielding can also be used in a CVT with higher insulating property and lower power consumption.

Description

Technical field [0001] The invention relates to a voltage divider, in particular to a coupling capacitor voltage divider with a potential gradient shield. Background technique [0002] The grounding resistance of the substation and the residual inductance of the grounding grid are much larger than the grounding impedance of a high-voltage laboratory with excellent performance, even one to two orders of magnitude difference. When a transient overvoltage occurs in the power grid, the pulse current of the capacitive device will cause the potential of the ground terminal of the capacitive device to rise instantaneously. This phenomenon will cause the voltage divider of the secondary device at the so-called ground potential. Great harm. [0003] One feature of the smart grid is to move the back-end secondary equipment away from the primary equipment to the vicinity of the primary equipment, including a large number of condition monitoring devices to realize the intelligence of equipmen...

AI Technical Summary

Problems solved by technology

In the past, in order to reduce the interference effect of the external electric field on the CVT error characteristics, the method of increasing the capacitance of the coupling capacitor was often used, which not only increased the manufacturing cost of the equipment, the difficulty of the process and the test, but also adversely affected the field strength of the coupling capacitor voltage divider unit element. design

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