Angle joint capacitor set switching module

A capacitor bank, switching module technology, applied in electrical components, circuit devices, AC network circuits, etc., can solve the problems of inability to achieve accurate three-phase electric compensation, capacitor explosion, affecting the service life of capacitors, etc., and prolong the service life. , avoid inrush current and ensure the effect of safe operation

Active Publication Date: 2016-08-03
广州开能电气技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method cannot achieve accurate compensation of reactive power between phases of three-phase electricity, and it is very likely that over-compensation or under-compensation between phases will occur, and switching with an AC contactor will generate a large surge current in the line, which will affect the capacitor. service life, and even make the capacitor explode

Method used

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  • Angle joint capacitor set switching module

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Embodiment Construction

[0015] Such as figure 1 As shown, the delta capacitor bank switching module of this embodiment consists of an improved delta capacitor bank, two small inductors L1, L2, four synchronous switches K1, K2, K3, K4, two capacitor pre-charging circuits 10, 20, and a controllable switch drive circuit. The capacitor pre-charging circuit 10 is composed of a relay k01 and a resistor R01 connected in series, and the capacitor pre-charging circuit 20 is composed of a relay k02 and a resistor R02 connected in series. The improved delta-connected capacitor has four input terminals A, B1, B2, and C. The input terminal A is connected to the phase line LA of the three-phase four-wire distribution network line through a small inductance L1 and a synchronous switch K1. The small inductance L1 It is connected in series with the synchronous switch K1, the input terminal B1 is connected to the phase line of the three-phase distribution network line LB through the synchronous switch K2, the capacit...

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Abstract

A switching module for a corner capacitor bank, comprising an improved corner capacitor bank, four controllable switches K1, K2, K3, K4, two small inductors L1, L2, two capacitor precharging circuits 10, 20, and Controllable switch drive circuit; the invention is connected to the A, B, and C phase lines of the three-phase distribution network line, and can realize asynchronous compensation between the phases of AB, BC, and AC. Multiple modules can be used together to avoid under-compensation or over-compensation of reactive power. Compensation occurs. The controllable switch adopted in the present invention can accurately control the switching time of each capacitor, avoiding the generation of surge current, and the small inductance connected in series with the controllable switch and the capacitor pre-charging circuit connected in parallel with the controllable switch suppress the capacitor input The impact current that may be caused by the power grid, these two points prolong the service life of the module and ensure the safe operation of the entire device.

Description

technical field [0001] The invention relates to an angle-connected capacitor bank switching module used in a three-phase power optimization device. Background technique [0002] The asymmetrical operation of the distribution transformer will generate a large amount of negative sequence current and zero sequence current. These negative sequence current and zero sequence current will seriously pollute the power grid, greatly increase the power loss of the power grid, reduce the output of the transformer, and threaten the safety of the distribution transformer. operation, seriously affecting the quality of power supply. The national standard GB50052-2009 "Specifications for Power Supply and Distribution" and DL / T572-2010 "Transformer Operation Regulations" all have strict requirements on the size of the neutral line current and the unbalance of the three-phase current when the distribution transformer with Y / YN0 connection is running. . [0003] The three-phase power optimiza...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/18
CPCY02E40/30H02J3/1864
Inventor 蔡晓燕
Owner 广州开能电气技术有限公司
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