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No-load closing inrush current and overvoltage suppression unit of ultrahigh-voltage transformer

A no-load closing and suppression device technology, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as difficult voltage control, long UHV lines, and affecting system flexibility

Inactive Publication Date: 2014-12-24
HARBIN PATEERN SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reason is that Nanyang Station is a switch station, the UHV line is long, and voltage control is difficult
This mode of operation affects the flexibility of the system operation to a certain extent, and the subsequent UHV project may perform switching operation on the 1000kV side. Deep research

Method used

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  • No-load closing inrush current and overvoltage suppression unit of ultrahigh-voltage transformer
  • No-load closing inrush current and overvoltage suppression unit of ultrahigh-voltage transformer

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Embodiment Construction

[0013] UHV transformer no-load closing inrush current and overvoltage suppression device system diagram using switching transformer TK technology figure 1 Shown: including isolating switch G1, operating circuit breaker K1, switching transformer TK, thyristor SCR, isolating switch G2, closing circuit breaker K2; the upper end of the primary winding of the switching transformer TK is connected with an isolating switch G2, and the switching transformer The lower end of the side winding is connected to the gate circuit breaker K2; the two ends of each phase single winding on the secondary side of the switching transformer are connected with two positive and negative parallel thyristors SCR; the isolation switch G1 is connected to the running circuit breaker K1, two isolation switches G1, G2 The other end of the circuit breaker is connected to the power supply; the other end of the two circuit breakers K1 and K2 is connected to the no-load transformer T.

[0014] The no-load closin...

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Abstract

The invention relates to a no-load closing inrush current and overvoltage suppression unit of an ultrahigh-voltage transformer and belongs to the technical field of power electronics. The unit is applicable to no-load closing inrush current and overvoltage suppression for the ultrahigh-voltage transformer; inrush current and overvoltage generated in switching the transformer are decreased; meanwhile, less arc light occurs between contacts of a breaker; the service life of the transformer is prolonged; especially under the condition that ultrahigh-voltage grids both domestic and abroad fail to allow switching of the transformers, the importance of the unit upon operational safety and stability of the grids is more highlighted.

Description

technical field [0001] The invention relates to a UHV transformer no-load closing inrush current and overvoltage suppressing device, which belongs to the field of power electronics technology and can be used for UHV transformer no-load closing inrush current and overvoltage suppression. The device is beneficial to the safe and stable operation of UHV power grids important role. Background technique [0002] When the UHV no-load transformer is put into the system, due to the nonlinearity of the transformer excitation characteristics, a large excitation inrush current may be generated, and odd harmonics of 3 or more times appear in the current waveform. Due to saturation, the inductance of the transformer will also change periodically between saturation and unsaturation. The frequency of inductance change is an even multiple of the power frequency, which will generate even harmonics in the current waveform, which makes the current waveform contain 2, 3 , 4, 5... each harmonic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/04
Inventor 潘家忠李天昊
Owner HARBIN PATEERN SCI & TECH
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