A mov series resistance type damping resistor for UHV series compensation

Abstract

The invention provides a metal oxide varistor (MOV) string resistor type damping resistor for extra-high voltage series compensation. The MOV string resistor type damping resistor for the extra-high voltage series compensation comprises a MOV part 1 and a linear resistor part 2, wherein the MOV part 1 and the linear resistor part 2 are connected in series. The MOV part 1 comprises at least two MOV strings 3 connected in parallel. The MOV strings 3 comprise at least two zinc oxide valve plates 5 connected in series. The linear resistor part 2 comprises at least two resistor strings 4 connected in parallel. The resistor strings 4 comprise at least two ceramic resistor plates 6 connected in series. The MOV strings 3 are further provided with linear resistors 7 in series connection with the zinc oxide valve plates 5. The number of the ceramic resistor plates 6 in series connection with the resistor strings 4 is reduced to ensure that resistance value of the damping resistor is not changed. The MOV string resistor type damping resistor for the extra-high voltage series compensation is capable of enabling a part of the linear resistors to be placed into all the MOV strings connected in parallel and connected with the zinc oxide valve plates in series, and enabling the linear resistors connected in series to draw resistors between the MOV strings closer, and achieving even current of all the MOV strings.

Description

technical field [0001] The invention relates to a damping resistor, in particular to an MOV series resistance type damping resistor for UHV series compensation. Background technique [0002] The damping device for series compensation is an important equipment of the series compensation device, which is used to limit the amplitude and frequency of the discharge current of the capacitor bank, reduce the damage of the discharge current to the capacitor, bypass switch and protection gap; and quickly control the discharge current of the capacitor bank Attenuation to reduce the impact of residual voltage on circuit breaker recovery voltage and submerged arcing. The damping device consists of a damping reactor and a damping resistor connected in parallel. The damping reactor is used to limit the amplitude and frequency of the discharge current of the capacitor bank, and the damping resistor is used to absorb the discharge energy of the capacitor bank. [0003] Damping resistors ar...

AI Technical Summary

Problems solved by technology

[0005] 1. The MOV part of the MOV series resistance type damping resistor has a large heat capacity and is composed of multiple columns connected in parallel. Each column MOV is composed of several zinc oxide valves in series. Due to the highly nonlinear volt-ampere characteristics of the zinc oxide valve, After multi-column MOVs are connected in parallel, the current distribution between the columns will be very uneven, which will easily cause the technical performance of the valve to decline or even be damaged.

[0006] 2. Each MOV column of the MOV series resistance type damping resistor adopts an independent structure and then connected in parallel, which will cause a lot of increase in volume and weight, which will bring inconvenience to the production and practical use of the damping resistor

[0007] 3. The linear resistor and the zinc oxide valve in the damping resistor are made of ceramic material. It is difficult to make the contact surface very smooth, and there are many concave and convex parts, which may easily lead to poor actual contact, local overheating, and damage to the device.

Images