Twelve pulsating commutation transformer and method and circuit for removing residual magnetism thereof

A converter transformer and 12-pulse technology, applied in the field of transformers, can solve the problems of no obvious excitation inrush current characteristics of differential current, large difference protection malfunction, etc., to achieve long-term safe and stable operation, prevent protection malfunction, and easy implementation. Effect

Active Publication Date: 2013-01-23
EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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Problems solved by technology

[0014] The purpose of the present invention is to provide a 12-pulse converter transformer, aiming to solve the problem that the 12-pulse converter transformer may form a three-phase symmetrical inrush current caused by residual magnetism when charging, resulting in no obvious excitation of the three-phase differential current Inrush current characteristics, resulting in the problem of misoperation of large difference protection

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  • Twelve pulsating commutation transformer and method and circuit for removing residual magnetism thereof
  • Twelve pulsating commutation transformer and method and circuit for removing residual magnetism thereof
  • Twelve pulsating commutation transformer and method and circuit for removing residual magnetism thereof

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[0034] In order to make the object, technical solution and advantages of the present invention more clear and definite, the present invention will be further described in detail below with reference to the accompanying drawings and examples.

[0035] The equivalent circuit diagram of the twelve-pulse converter transformer before empty charging is as follows: figure 2 Shown, T 1 is the star angle change, T2 is the star change, and K is the switch. L 1m , L 1σ , R lσ1 , L 2m , L 2σ , R 2σ Respectively T 1 , T 2 Excitation inductance, primary and secondary side leakage inductance, coil resistance, Ls, Rs are system inductance and resistance. Let the system power supply voltage Us(θ)=Umsin(θ), i 1 i 2 are the currents on both sides of the transformer respectively, and the reference direction is that the busbar points to the transformer; i s For the current from the system, the reference direction is the system pointing to the bus. Φ 1 and Φ 2 for T 1 and T 2 core...

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Abstract

The invention discloses a twelve pulsating commutation transformer and a method and a circuit for removing residual magnetism thereof. In the principle of the method, direct current is injected sequentially in a positive direction and a reverse direction according to wiring during a test of a direct-current resistor and is reduced gradually, and a magnetic-lag loop of an iron core is reduced to achieve the aim of removing the residual magnetism. Through the method, the commutation transformer can run reliably, and the long-term, safe and stable operation of a high-voltage direct-current transmission system is realized; and the method has the advantages of simple and easy implementation, reliable demagnetizing and capability of preventing malfunction from generating.

Description

technical field [0001] The invention relates to a transformer, in particular to a twelve-pulse converter transformer, a method for removing residual magnetism thereof, and a high-voltage direct current transmission system using the twelve-pulse converter transformer. Background technique [0002] Due to its unique advantages, such as: long distance, high power, asynchronous networking, fast power adjustment, power flow controllability, transmission economy, etc., HVDC transmission is more and more widely used. [0003] In order to reduce the harmonic components of the system, different connection methods of transformer windings are used to provide two sets of three-phase symmetrical commutation with equal amplitude and 30° phase difference (fundamental electrical angle) for two series-connected converters voltage to achieve twelve-pulse commutation. [0004] figure 1 The wiring of the 12-pulse converter transformer is shown. In order to reflect the internal phase-to-phase ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P13/00
Inventor 田庆王海军程江平张楠张兴华
Owner EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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