10kV capacitive voltage divider

Abstract

The invention discloses a 10 kV capacitive voltage divider. The capacitive voltage divider is mainly composed of a shell, a first voltage divider unit, a second voltage divider unit, an insulating frame and resin for filling. The shell is composed of a shell body and a high-voltage wiring terminal which are integrated through mold pouring; the first voltage divider unit is composed of a first high-voltage leading-out wire, a first high-voltage arm capacitor, a first low-voltage arm capacitor, a first central end connecting wire, a first voltage dividing signal output wire and a first groundingwire. The second voltage divider unit is composed of a second high-voltage leading-out wire, a second high-voltage arm capacitor, a second low-voltage arm capacitor, a second central end connecting wire, a second voltage dividing signal output wire and a second grounding wire. The insulating frame is composed of two insulating parts and a binding belt, and the resin for filling fills gaps among the shell, the first voltage divider unit, the second voltage divider unit and the insulating frame. The voltage divider is simple in structure, convenient to install and use and capable of meeting therequirement for long-term safe, stable and reliable work of the capacitor under the indoor and outdoor environment conditions.

Description

technical field [0001] The invention belongs to the field of electrical measurement, and in particular relates to a 10kV capacitive voltage divider for sampling signals of distribution network electrical measurement. Background technique [0002] Voltage dividers are important devices for electrical measurement in power systems. There are many types of voltage dividers, such as electromagnetic voltage transformers, capacitive voltage transformers, traditional power frequency voltage dividers, and photoelectric voltage sensors. [0003] The electromagnetic voltage transformer uses SF6 as the main insulating material, and the voltage level is very high. The disadvantages are: ferromagnetic nonlinearity is easy to cause ferromagnetic resonance in the power grid, its insulation structure is complex, and the insulation performance is not good. With the increase of the voltage level, its manufacturing Costs increase non-linearly. Traditional oil-immersed capacitive voltage trans...

AI Technical Summary

Problems solved by technology

[0003] The electromagnetic voltage transformer uses SF6 as the main insulating material, and the voltage level is very high. The disadvantages are: ferromagnetic nonlinearity is easy to cause ferromagnetic resonance in the power grid, its insulation structure is complex, and the insulation performance is not good. With the increase of the voltage level, its manufacturing non-linear cost increase

Resistive voltage dividers have disadvantages: large power loss, large size, and poor operating economy

[0006] 1) The capacitor adopts ceramic capacitor, which has the advantage of high dielectric constant, and the disadvantages are: low voltage, small capacity, poor capacity stability, and large change in capacity with temperature, voltage and time;

[0007] 2) High-voltage capacitors use the distributed capacitance between high-voltage electrodes and low-voltage electrodes, and low-voltage capacitors use metallized film capacitors. The disadvantages are: the dielectrics of the two types of capacitors are different, the temperature coefficients are different, and the capacity varies with temperature and voltage range;

[0009] The high and low voltage capacitors use different dielectric thicknesses, and their disadvantages are: the high and low voltage voltage following characteristics are unstable, and the partial discharge performance index is poor

Images