Transformer digital self-adaptive protection device and method based on pressure features

A technology for protection devices and transformers, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as differential protection misoperation, limited oil pressure changes, and box deformation.
CN109980602AActive Publication Date: 2019-07-05BEIJING ZHONGRUIHE ELECTRICAL +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
BEIJING ZHONGRUIHE ELECTRICAL
Publication Date
2019-07-05

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Abstract

The invention provides a transformer digital self-adaptive protection device and method based on pressure features. The device comprises a transient oil pressure feature quantity measuring module, a switching quantity input module, a signal modulation and collection module and a digital core module, wherein the transient oil pressure feature quantity measuring module is connected with the signal modulation and collection module; and the signal modulation and collection module and the switching quantity input module are connected with the digital core module. The transient oil pressure digitalinformation of a plurality of measuring points inside an oil tank is obtained in real time; an action pressure value representing the oil pressure amplitude is obtained through operation; a protectioncriterion and threshold value setting method is built by using the obvious differences of the feature quantity under different operation conditions of a transformer; the reliable fast and sensitive discrimination and elimination of faults inside the oil tank of the transformer can be realized; and no influence is caused by excitation inrush current. Meanwhile, the fault state self-adaptive and threshold value self-adaptive protection scheme is designed so as to accelerate the protection action speed.
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Description

technical field

[0001] The invention belongs to the field of electric power systems, and relates to a transformer digital self-adaptive protection device and method based on pressure characteristics, which are used for reliable, fast and sensitive identification of internal faults in oil tanks of oil-immersed power transformers. Background technique

[0002] As an important component of power transmission, the power transformer will have a serious impact on the reliability and operation stability of the power system once it fails. Especially for large power transformers installed at the hub of the system, because of their high voltage level, large capacity, complex structure, and high cost, damage due to failure will inevitably cause huge economic losses. Therefore, a relay protection device with good performance and reliable operation must be installed according to the capacity and importance of the transformer.

[0003] The development of relay protection technology depen...

Claims

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