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Locking method for large-difference percentage differential protection magnetizing inrush current of converter transformer

A technology for converter transformers and exciting inrush currents, applied to emergency protection circuit devices, electrical components, etc., can solve problems such as misoperation and slow attenuation speed of inrush currents, and achieve the effect of enhanced blocking ability and fast action

Active Publication Date: 2015-01-07
NR ELECTRIC CO LTD +2
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Problems solved by technology

[0005] Because the special excitation inrush current of the large-difference differential of the commutation transformer is very similar to the waveform of the transformer fault, and the inrush current attenuation speed is very slow, if no measures are taken, the large-difference ratio differential protection may malfunction during empty charging

Method used

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  • Locking method for large-difference percentage differential protection magnetizing inrush current of converter transformer
  • Locking method for large-difference percentage differential protection magnetizing inrush current of converter transformer

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Embodiment Construction

[0016] The scheme of the present invention is specifically as follows: firstly, the electrical quantity is collected, including the CT current (CT1, CT2) of the switch on the side of the converter transformer network, the CT current (CT3) of the bushing on the side of the YY converter transformer valve, and the CT current (CT3) of the bushing on the side of the YD converter transformer valve. current (CT4), such as figure 1 shown.

[0017] According to the collected electrical quantity, the detection of the converter and the empty charge, and the identification of the blocking of the excitation inrush current cycle are carried out;

[0018] Among them, the empty charging detection of the converter transformer specifically refers to: collecting the CT current of the switch on the side of the converter transformer network, summing the CT current of the double switch, and dividing it into three phases of ABC. It is judged to be in a current state, otherwise it is a no-current st...

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Abstract

The invention provides a locking method for large-difference percentage differential protection magnetizing inrush current of a converter transformer. The working manner of the locking method is that when the converter transformer is idled, a cycled locked inrush current criterion is used for judging the magnetizing inrush current, and after the inrush current criterion is met, the current converting large-different percentage differential protection function is locked. The locking capability of the magnetizing inrush current in the process that current converting is changed into idling is improved, and large-different percentage differential protection false operation in the process that current converting is changed into idling is avoided.

Description

technical field [0001] The invention relates to a design method for converter transformer protection in the field of electric power system, in particular to a method for blocking excitation inrush current of converter transformer large difference ratio differential protection. Background technique [0002] Compared with ordinary transformers, converter transformers have different application occasions and different primary structures (such as figure 1 shown), the protection configuration is different. [0003] High-voltage and large-capacity converter transformers are usually composed of two completely independent two-turn transformers. One Y / Y connection, one Y / D connection, two transformers run in parallel, switch on and off at the same time. The large difference differential protection uses the network side switch CT and the valve side bushing CT to complete the differential flow calculation, and the D side CT is installed in the delta ring. From the perspective of diff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/045
Inventor 张晓宇文继锋莫品豪顾乔根郑超
Owner NR ELECTRIC CO LTD
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