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Power electronic tap changer modules for transformers

A technology of power electronics and transfer switches, applied in the direction of electric switches, transformers, variable transformers, etc., can solve the problems of reduced parameters and life, arc faults inside transformer windings, etc., to achieve reduced size and floor space, and lower tolerance Voltage rating, effect of improving reliability

Active Publication Date: 2020-12-29
HITACHI ENERGY SWITZERLAND AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is not allowed to leave an open circuit as it may cause an internal arc fault in the transformer winding
Limitations of transient voltage suppressors are: significant degradation of their parameters and lifetime after each action / trigger in case of MOV devices and spark gaps, or very limited power rating in case of TVS diodes

Method used

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  • Power electronic tap changer modules for transformers
  • Power electronic tap changer modules for transformers
  • Power electronic tap changer modules for transformers

Examples

Experimental program
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Embodiment Construction

[0017] The power electronic tap changer has a tap changer module 1 having a plurality of tap lines L1, L2, L3....LN electrically connected via terminals a1...aN (N is natural number), the plurality of tap lines L1, L2, L3.....LN are connected to the voltage source 2 from the power supply side directly or through the primary winding 3 of the transformer 4, and pass through the terminals b1..... .bN and segments 31 , 32 , 33 , ..3N are connected to the primary winding 3 of the transformer 4 . The secondary winding 5 of the transformer 4 is connected to a load 6 . The reverse designation of the windings of the transformer 4 having secondary windings or primary windings does not interfere with the invention. Each of the tap lines L1 , L2 , L3 . . . LN has an electronic valve V1 . . . VN connected to the controller 7 for selective triggering purposes. The valves V1 . . . VN have a pair of thyristors or transistors SCR1 connected from one side to the controller 7 via a trigger cir...

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Abstract

The subject of the invention is a power electronic tap changer module ( 1 ′) for a transformer ( 4 ) using power electronic components connected to segments of the primary winding ( 3 ) of the transformer. The power electronic tap changer module (V) is equipped with valves (V1'...VN') having a pair of thyristors or transistors connected to the controller (7), and The valves (V1'...VN') are respectively connected in series with the fuses (F1...FN). The module (1') is equipped with an additional oversized tap line (LX) with an oversized valve (VX) rated for short-circuit current, said valve being connected to The overvoltage trigger circuit (11) is connected. The oversized valve (VX) is equipped with a pair of thyristors or transistors connected to a voltage suppressor (13) for thermal protection.

Description

technical field [0001] The subject of the invention is a power electronic tap changer module for a transformer using power electronic components connected to segments of the primary winding of the transformer. Background technique [0002] Power electronic switching elements connected to transformer windings should conduct nominal current, withstand short circuit and overcurrent conditions, and also withstand overvoltage or open circuit conditions with continuous power flow. [0003] For short circuit or overcurrent conditions, the valves of tap changer modules are very often designed with oversized power electronic components, such as thyristors, IGBTs, MOSFETs, to withstand the short circuit or overcurrent for a defined period of time. In some cases, the short circuit or overcurrent duration may be several seconds. For economical reasons, it is unreasonable to apply oversized valves to all taps, especially when each tap changer module valve may consist of several series-c...

Claims

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Application Information

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IPC IPC(8): G05F1/67
CPCG05F1/67G05F1/20H01C7/12H01F29/04H01H9/0005H02H7/055
Inventor P.阿洛斯科F.格瑞基J.杰兹K.奥布瑞斯基M.佐佩克M.奥斯特罗格斯卡
Owner HITACHI ENERGY SWITZERLAND AG
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