Linkage protection device for transformer neutral point DC blocking equipment and method thereof

A technology of transformer neutral point and DC isolation equipment, applied in emergency protection circuit devices, emergency protection circuit devices, circuit devices and other directions for limiting overcurrent/overvoltage, which can solve equipment failures, transformer damage, and equipment power outages Inability to operate and other problems, to achieve the effect of saving equipment costs and realizing remote control
CN105490249AActive Publication Date: 2016-04-13YANGJIANG NUCLEAR POWER
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
YANGJIANG NUCLEAR POWER
Publication Date
2016-04-13

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Abstract

The invention provides a linkage protection device for transformer neutral point DC blocking equipment and a method thereof. The linkage protection device comprises the components of an access bus which is connected with N sets of DC blocking equipment, wherein N is a positive integer which is larger than or equal with 2; a main controller which is used for monitoring state information of each set of DC blocking equipment and transmitting an instruction for triggering already acted DC blocking equipment to make a corresponding transformer neutral point be grounded when a condition that the states of the DC blocking equipment are not totally same is determined according to the state information of each set of DC blocking equipment; and a data conversion module which is connected with the access bus and the main controller and is used for converting data in the access bus to the data that are readable by the main controller and converting the instruction that is transmitted by the main controller for transmitting to the access bus. When a fault or power failure of certain DC blocking equipment occurs and the DC blocking equipment cannot operate, other sets of DC blocking equipment in normal operation can be shunted, and all transformers directly perform grounded operation, thereby sharing a DC current and preventing bearing of an overlarge DC current by a certain transformer. Furthermore the plurality of sets of equipment share one linkage protection device, thereby realizing cost saving.
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Description

technical field

[0001] The invention relates to the field of transformer protection, in particular to a linkage protection device and method for transformer neutral point DC blocking equipment. Background technique

[0002] High voltage direct current transmission (HVDC) system has been more and more widely used due to its characteristics of long transmission distance, large transmission capacity, and flexible control. The mutual influence is also more obvious. When the DC transmission system is operated with unipolar grounding or bipolar unbalanced operation, the DC current will be injected into the ground through the grounding pole, and the DC current in the ground will invade the AC system through the neutral point grounding wire of the transformer, which will have an impact on the AC system. The most significant impact is Causes the DC bias of the transformer to appear.

[0003] In order to suppress the impact of DC transmission on the operation of transformers, more a...

Claims

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