CN210224950U

CN210224950U - Series compensation current limiting device based on spark GAP GAP

Info

Publication number: CN210224950U
Application number: CN201921036288.2U
Authority: CN
Inventors: Chuan Wang; 王川; Guoyong Zhang; 张国勇; Anchao Song; 宋安超
Original assignee: ANHUI HUIDIAN TECHNOLOGY Co Ltd
Current assignee: ANHUI HUIDIAN TECHNOLOGY Co Ltd
Priority date: 2019-07-04
Filing date: 2019-07-04
Publication date: 2020-03-31
Anticipated expiration: 2029-07-04

Abstract

The utility model relates to a series compensation current limiting device based on spark GAP GAP, the device include current limiting reactor L, silicon controlled rectifier SCR, condenser C, zinc oxide nonlinear resistor MOV and spark GAP GAP. The inlet wire end of the current-limiting reactor L is used as the inlet wire end of the device, and the outlet wire end is connected with the inlet wire end of the capacitor C; the SCR is connected in parallel at two ends of a current-limiting reactor L; the zinc oxide nonlinear resistor MOV and the spark gap MOV are connected in parallel at two ends of the capacitor C; and the outlet end of the capacitor C is used as the outlet end of the device. The utility model has the advantages of simple structure, safe and reliable, can be when electric power system takes place short-circuit fault, restriction short-circuit current's intensity can offset the reactance in the transmission line through condenser C again, reduces the voltage drop on the transmission line, improves the voltage quality of circuit.

Description

Series compensation current limiting device based on spark GAP GAP

Technical Field

The utility model belongs to the technical field of electric power system current-limiting reactor technique and specifically relates to a current limiting device is mended to cluster based on spark GAP GAP.

Background

With the development of economy, the electric load is increased sharply, the capacity of a power grid is increased, and the impact of the continuously increased short-circuit current on electric equipment of a power system is larger and larger. Meanwhile, the breaking capacity of the existing circuit breaker is difficult to meet the requirement of breaking huge short-circuit current. Therefore, to solve this serious problem, the current-limiting reactors are widely used in the power transmission and distribution system of the power system in a manner of being connected in series in a loop.

The current limiting reactor is connected in series in the loop, although the intensity of short-circuit current can be limited, the impact of the short-circuit current on electrical equipment in a power system is reduced, the bus voltage is maintained, and the further expansion of short-circuit faults is avoided. However, the series current-limiting reactor has many disadvantages: firstly, huge reactive loss generated in a series loop of a current-limiting reactor also causes great economic burden to users; secondly, when the reactance value of the current-limiting reactor is selected, the contradiction that the user terminal voltage is too low under the rated current after the requirement of limiting the short-circuit current is met often exists. In the long-distance transmission process of the power transmission and distribution network of the power system, the power transmission line can also generate inductive reactance, and an invisible and potential reactor connected in series in a user load loop is formed substantially equivalently, so that the user terminal voltage is reduced, and meanwhile, the reactive loss is large.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a current limiting device is mended to cluster based on spark GAP GAP, the device can be when electric power system takes place short-circuit fault, and the reactance in the transmission line can be offset through condenser C again to restriction short-circuit current's intensity, reduces the voltage drop on the transmission line, improves the voltage quality of circuit.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a series compensation current limiting device based on a spark GAP GAP comprises a current limiting reactor L, a silicon controlled rectifier SCR, a capacitor C, a zinc oxide nonlinear resistor MOV and the spark GAP GAP. And the wire inlet end of the current-limiting reactor L is used as the wire inlet end of the device, and the wire outlet end is connected with the wire inlet end of the capacitor C. The SCR is connected in parallel at two ends of a current-limiting reactor L; the zinc oxide nonlinear resistor MOV and the spark gap MOV are connected in parallel at two ends of the capacitor C; and the outlet end of the capacitor C is used as the outlet end of the device.

Specifically, the current limiting reactor L is used to limit the intensity of short-circuit current when a short-circuit fault occurs in the power system. And the capacitor C is used for providing reactive power required by the current-limiting reactance L. The zinc oxide nonlinear resistor MOV is used for limiting the terminal voltage of the capacitor C and preventing the capacitor C from being damaged due to overvoltage. And the spark GAP GAP is used for quickly short-circuiting the exit capacitor C when the power grid fails.

Furthermore, the silicon controlled rectifier SCR is a bidirectional silicon controlled rectifier and comprises two silicon controlled rectifiers which are connected in an anti-parallel mode; and the silicon controlled rectifier SCR controls the on-off brake of the silicon controlled rectifier SCR through a controller installed in the power distribution cabinet.

According to the above technical scheme, the utility model has the advantages of simple structure, safe and reliable, when power system takes place short-circuit fault, restriction short-circuit current's intensity can offset the reactance in the transmission line through condenser C again, reduces the voltage drop on the transmission line, improves the voltage quality of circuit.

Drawings

Fig. 1 is an electrical schematic diagram of the present invention.

Detailed Description

As shown in fig. 1, a series compensation current limiting device based on a spark GAP includes a current limiting reactor L, a silicon controlled rectifier SCR, a capacitor C, a zinc oxide nonlinear resistor MOV, and a spark GAP. And the wire inlet end of the current-limiting reactor L is used as the wire inlet end of the device, and the wire outlet end is connected with the wire inlet end of the capacitor C. The SCR is connected in parallel at two ends of a current-limiting reactor L; the zinc oxide nonlinear resistor MOV and the spark gap MOV are connected in parallel at two ends of the capacitor C; and the outlet end of the capacitor C is used as the outlet end of the device.

The utility model discloses a theory of operation does:

when a power grid fails, the silicon controlled rectifier SCR is driven to perform switching-off operation, and the spark GAP GAP is driven to perform switching-on operation, so that the capacitor C is in short circuit, the capacitor C is prevented from being damaged due to overcurrent, the current-limiting reactor L can be ensured to be connected in a loop in series fast enough, the intensity of short-circuit current is limited by the current-limiting reactor L, and the impact of the short-circuit current on electrical equipment is greatly reduced. When the device controller detects that the fault of the network is cut off and the line current reaches a set value, the device controller immediately sends a brake opening command to the spark GAP GAP to enable the capacitor C to be put into line operation.

The above-mentioned embodiments are only for describing the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art without departing from the design spirit of the present invention should fall into the protection scope defined by the claims of the present invention.

Claims

1. A series compensation current limiting device based on a spark GAP GAP is characterized in that: the device comprises a current-limiting reactor L, a Silicon Controlled Rectifier (SCR), a capacitor C, a zinc oxide nonlinear resistor MOV and a spark GAP GAP; the inlet wire end of the current-limiting reactor L is used as the inlet wire end of the device, and the outlet wire end is connected with the inlet wire end of the capacitor C; the SCR is connected in parallel at two ends of a current-limiting reactor L; the zinc oxide nonlinear resistor MOV and the spark gap MOV are connected in parallel at two ends of the capacitor C; and the outlet end of the capacitor C is used as the outlet end of the device.

2. A spark GAP, based series compensation current limiting device according to claim 1, wherein: the SCR is a bidirectional SCR and comprises two anti-parallel thyristors; and the silicon controlled rectifier SCR controls the on-off brake of the silicon controlled rectifier SCR through a controller installed in the power distribution cabinet.