Star-connection capacitor bank switching module

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, large surge current, large harmonic pollution, etc., to reduce inrush current, The effect of prolonging the service life and ensuring safe operation

Active Publication Date: 2016-06-15
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 kind of compensation device has high cost, large volume, large harmonic pollution, high maintenance cost, and is not suitable for frequent operation.
Using an AC contactor to switch will generate a large surge current in the line, which will affect the service life of the capacitor and even cause the capacitor to explode

Method used

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  • Star-connection capacitor bank switching module

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Embodiment Construction

[0015] Such as figure 1 As shown, the star-connected capacitor bank switching module of this embodiment consists of a star-connected capacitor bank, three small inductors L1, L2, L3, three synchronous switches K1, K2, K3, three capacitor pre-charging circuits 10, 20, 30, and a controllable switch drive circuit. The capacitor precharging circuit 10 is composed of a relay k01 and a resistor R01 connected in series, the capacitor precharging circuit 20 is composed of a relay k02 and a resistor R02 connected in series, and the capacitor precharging circuit 30 is composed of a relay k03 and a resistor R03 connected in series. The output end A of the star-connected capacitor bank is connected to the first end of the small inductance L1, and the second end of the small inductance L1 is connected to the three-phase four-wire distribution network line LA through the synchronous switch K1; The output end B of the capacitor bank is connected to the first end of the small inductance L2, ...

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Abstract

A star-connection capacitor bank switching module is disclosed. The star-connection capacitor bank switching module comprises a star-connection capacitor bank, three controllable switches K1, K2 and K3, three small inductors L1, L2 and L3, three capacitor pre-charging circuits 10, 20 and 30, and a silicon controlled rectifier driving circuit, wherein the N input terminal of the star-connection capacitor is connected with the null line LN of a distribution network line; A, B and C input terminals are connected with the first ends of the three small inductors respectively; the second ends of the three small inductors are connected with LA, LB and LC phase lines of the distribution network line through the three controllable switches respectively; the three capacitor pre-charging circuits are connected with the three controllable switches in parallel; and the three output ends of the controllable switch driving circuit are connected with the control ends of the three controllable switches respectively. The star-connection capacitor bank switching module is connected with the distribution network line; three-phase reactive power time-sharing compensation can be realized; the generation of surge current in the capacitor switching process can be effectively avoided; impact current that may be caused when the capacitor is connected to the power grid can be reduced; and the service life of the module is prolonged.

Description

technical field [0001] The invention relates to a star-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 optimizati...

Claims

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Application Information

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