A transformer digital protection device and method based on total pressure information

A transformer, digital technology, applied in the field of transformer digital protection devices, can solve the problems of differential protection misoperation, limited oil pressure change, box deformation, etc.
CN110112706BActive Publication Date: 2022-01-18BEIJING ZHONGRUIHE ELECTRICAL +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BEIJING ZHONGRUIHE ELECTRICAL
Publication Date
2022-01-18

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Abstract

A transformer digital protection device and method based on full pressure information, including: a transient oil pressure characteristic quantity measurement module, a switch input module, a signal conditioning and acquisition module, and a digital core module; wherein, the transient oil pressure characteristic quantity measurement The module is connected with the signal conditioning and acquisition module, and the signal conditioning and acquisition module and the digital input module are all connected with the digital core module. The invention obtains the digital information of transient oil pressure at multiple measuring points inside the oil tank in real time, calculates and obtains the full value of the operating pressure representing the amplitude of the oil pressure, and utilizes the significant difference of the characteristic value under different operating conditions of the transformer to construct the protection criterion and the threshold value The setting method realizes reliable, rapid and sensitive screening and removal of internal faults in the transformer oil tank, and is not affected by the excitation inrush current. The principle of the invention is simple, the device is easy to implement, and it is suitable for the current and future requirements of large-capacity and high-voltage power transformers for non-electrical protection "four properties".
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Description

technical field

[0001] The invention belongs to the field of power systems, and relates to a transformer digital protection device and method based on full pressure information, 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 depends on the understandin...

Claims

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