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A large-drop protection method for HVDC converter transformers

A converter transformer and differential protection technology, which is applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problem of low sensitivity of converter transformer large difference protection, and achieve the effect of improving sensitivity

Inactive Publication Date: 2017-12-19
STATE GRID CORP OF CHINA +2
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  • Description
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Problems solved by technology

[0017] The purpose of the present invention is to provide a high-voltage direct current transmission converter transformer large-drop protection method to solve the problem that the sensitivity of the large-drop protection of the converter transformer is not high when a single-phase ground fault occurs in the valve side area of ​​the converter transformer

Method used

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  • A large-drop protection method for HVDC converter transformers
  • A large-drop protection method for HVDC converter transformers
  • A large-drop protection method for HVDC converter transformers

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Embodiment Construction

[0032] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0033] Such as figure 1 Shown is a schematic diagram of the installation position of the large difference protection TA, in which the present invention is the wiring of the improved algorithm, and the present invention selects half of the sum of the current at the head and end of the valve side of the Yn / Y converter transformer, and the head and end of the valve side of the Yn / D converter transformer Half of the sum of the currents, the side switch current of the converter transformer lead wire, and the middle switch current are used as differential currents, with the positive direction pointing to the converter transformer.

[0034] Taking phase A differential protection as an example, the calculation formula is as follows:

[0035]

[0036] Formula 3

[0037]

[0038] Formula 4

[0039] In the formula: I opA is the differential current of phase A ...

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Abstract

The invention relates to a high-voltage direct current transmission converter transformer large-difference protection method. When a single-phase ground fault occurs in the valve-side area of ​​the converter transformer, the sensitivity of the large-difference protection of the converter transformer can be improved, and the Yn / Y converter transformer valve side head, Half of the sum of the terminal currents, half of the sum of the valve side head and terminal currents of the Yn / D converter transformer, the switch current at the lead side of the converter transformer, and the switch current in the lead wire of the converter transformer are used as differential currents. The realization method of the present invention is simple and reliable, the realization threshold is relatively low, it can be realized on the original protection device platform, and has extremely high popularization value.

Description

technical field [0001] The invention relates to a large-difference protection method for a high-voltage direct current transmission converter transformer, belonging to the technical field of high-voltage direct current transmission systems. Background technique [0002] The converter transformer is one of the key equipment in the HVDC power transmission system. At present, the ideal configuration of the domestic HVDC power transmission project is to use a 12-pulse converter and configure 6 single-phase double-winding converter transformers to form Yn / Y and Yn / D Two single-phase transformer groups, the network side windings are connected in a star connection, the neutral point is directly grounded, the outgoing lines are connected to the AC power grid in parallel, and the valve side windings are Y-type and D-type connections respectively. figure 1 As shown in the traditional algorithm in . [0003] At present, the differential current of large differential protection of HVD...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/045
Inventor 张红跃熊章学宋红涛牛志雷刘家军杜延辉路振宇赵艳茹徐玉洁胡晓静王二军曹雪兰安友彬苏金国张艳浩
Owner STATE GRID CORP OF CHINA
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