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A switching module for a delta-connected capacitor bank

A capacitor bank, switching module technology, applied in reactive power compensation, reactive power adjustment/elimination/compensation and other directions, can solve the problems of capacitor explosion, affecting the service life of capacitors, unable to achieve accurate three-phase electric compensation, etc. Extend the service life, ensure safe operation, and avoid the effect of reactive power under-compensation or over-compensation

Active Publication Date: 2018-12-14
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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  • A switching module for a delta-connected capacitor bank

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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

An angle joint capacitor set switching module comprises an improved angle joint capacitor set, four controllable switches K1, K2, K3 and K4, two small inductors L1 and L2, two capacitor pre-charging circuits 10 and 20 and a controllable switch driving circuit, is connected with the A, B and C phase lines of the three-phase distribution network lines, and can realize the asynchronous compensation between the A and B phases, between the B and C phases and between the A and C phases. A plurality of modules are used jointly, thereby avoiding an undercompensation or overcompensation phenomenon. The controllable switches adopted by the present invention can control the switching time point of each capacitor accurately, thereby avoiding a surge current; and the small inductors in series connection with the controllable switches and the capacitor pre-charging circuits in parallel connection with the controllable switches restrain an impact current possibly caused when the capacitors are accessed in a power grid, so that the service lives of the modules are prolonged, and the safe operation of a whole device is guaranteed.

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. In the national standard GB50052-2009 "Specifications for Power Supply and Distribution" and DL / T 572-2010 "Transformer Operation Regulations", there are strict requirements on the size of the neutral current and the unbalance of the three-phase current when the distribution transformer with Y / YN0 connection is running. Require. [0003] The three-phase power ...

Claims

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Application Information

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