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Transformer neutral point blocking device, blocking system and control method thereof

A transformer neutral point and DC blocking device technology, which is applied to circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, emergency protection circuit devices, etc. automatic shutdown etc.

Inactive Publication Date: 2018-11-30
GUANGDONG POWER GRID CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The embodiment of this application provides a transformer neutral point DC blocking device, a DC blocking system and its control method, which solves the problem of asymmetrical short circuit occurring when the capacitor bank of the DC blocking device is put into use, and the anti-parallel double thyristor branch circuit Technical problems that cannot be automatically turned off after being turned on

Method used

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  • Transformer neutral point blocking device, blocking system and control method thereof
  • Transformer neutral point blocking device, blocking system and control method thereof
  • Transformer neutral point blocking device, blocking system and control method thereof

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Embodiment Construction

[0042] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiment of the application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the application. Obviously, the described embodiment is only It is a part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

[0043] Since the DC current entering the transformer will cause the iron core of the transformer to be magnetically saturated, resulting in a series of harmful effects such as harmonics and vibration. Therefore, when a DC current flows through the neutral point of the transformer, the DC blocking device should be in the DC blocking state, that is, the DC blocking s...

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Abstract

Embodiments of the application disclose a transformer neutral point blocking device. Dual conducting units of the device, that are a first thyristor and a second thyristor in inverse-parallel connection are respectively connected with auxiliary turn-off branches in parallel; the auxiliary turn-off branches include a direct current power source and a controllable switch tube, the positive electrodeof the direct current power source is connected to the anodes of the thyristors, and the negative electrode is connected to the cathodes of the thyristors through the controllable switch tube. The transformer neutral point blocking device provided by the embodiments of the application solves the technical problem that the capacitor group of the blocking device is asymmetrically short-circuited while being put into use, and the dual thyristor branches in inverse-parallel connection cannot be automatically turned off after being turned on. The embodiments of the application also disclose a transformer neutral point blocking system and a control method of the transformer neutral point blocking system.

Description

technical field [0001] The present application relates to the technical field of transformer protection, in particular to a transformer neutral point DC blocking device, a DC blocking system and a control method thereof. Background technique [0002] When the DC transmission system adopts the unipolar operation mode due to commissioning or failure, the earth will be used as a loop, causing a long-term large DC current to flow underground, so a surface current will be generated in a certain area around the DC grounding electrode, making the distance from the DC grounding electrode Transformer neutral potential rises in a nearby AC substation. If the neutral point of the transformer is grounded, the transformer will be disturbed, and a DC component will be generated in the excitation current of the transformer to saturate the iron core magnetically, thereby generating harmonics, causing vibration, noise, overheating and other problems, and in severe cases, it may cause damage ...

Claims

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Application Information

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IPC IPC(8): H02H9/02H02H7/04
CPCH02H9/02H02H7/04
Inventor 马明张益赓王玲徐柏榆雷二涛梁晓兵刘军
Owner GUANGDONG POWER GRID CO LTD
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