Online calibrating method for transformer sudden-change pressure relay

A sudden pressure and calibration method technology, applied in the direction of circuit breaker testing, etc., can solve the problems of large economic losses, sudden pressure protection mechanism, lack of understanding and confidence in application and reliability, and early failure prevention of faulty transformers, etc., to achieve verification Reliability and safety, easy calibration test, easy to use effect

Active Publication Date: 2014-12-17
SHANGHAI MUNICIPAL ELECTRIC POWER CO +2
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Problems solved by technology

Once the transformer in the city bursts into fire, it will not only cause great economic losses, but also cause greater social impact. Therefore, preventing faulty transformers from bursting into flames is a common requirement of all transformer manufacturers and electrical departments.
Especially in the harsh operating environment of transformers today, it is impossible to completely prevent early faults by only improving the anti-burst ability of the transformer itself to solve the problem of bursting of faulty transformers.
At this time, the application of sudden pressure protection is an improvement and supplement to the non-electricity protection of the main transformer; as far as the long-term operation of the site is concerned, the mechanism, application and reliability of sudden pressure protection from grassroots technicians to power companies are still lacking. understanding and confidence

Method used

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Embodiment

[0028] An online verification method for a sudden change in transformer pressure relay, comprising the following steps:

[0029] 1) Preload verification and digital module verification;

[0030] 2) Mutation detection, which includes three processes of preload control, mutation control, and reading action time;

[0031] 3) Air tightness testing;

[0032] 4) Traceability detection.

[0033] The preload verification is to verify the pressure value measured by the pressure sensor at the preload end.

[0034] The digital module verification is to verify the pressure measurement value at the pressure mutation relay end.

[0035] The described preload control process is as follows:

[0036] 21) For the pressure measurement at the preloading end, the pressure signal is converted into a mV signal through the preloading pressure sensor, and sent to the single chip microcomputer in the form of a differential signal for AD conversion to convert the analog signal into a 24-bit digital ...

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Abstract

The invention relates to an online calibrating method for a transformer sudden-change pressure relay. The online calibrating method includes the steps of (1) pre-pressure verification and digital module verification; (2) sudden change detection including three steps: pre-pressure controlling, sudden change controlling and actuation time reading; (3) air impermeability detection; and (4) trace detection. Compared with the prior art, the online calibrating method is convenient, reliable and safe to use, capable of providing powerful technical supports to field calibration of dynamic power grid measurement, and the like.

Description

technical field [0001] The invention relates to an online calibration method for a pressure relay, in particular to an online calibration method for a transformer mutation pressure relay. Background technique [0002] In order to meet the needs of the rapid development of my country's national economy, a large number of high-voltage and large-capacity transformers have entered the city center in recent years. Due to the particularity of urban power supply, the requirements for the safety of these transformers are getting higher and higher, especially the explosion-proof ability of the transformers. Once the transformer in the city bursts and catches fire, it will not only cause great economic losses, but also cause greater social impact. Therefore, preventing faulty transformers from bursting and igniting is a common requirement of all transformer manufacturers and power industry departments. Especially in the harsh operating environment of transformers today, it is impossi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/327
Inventor 袁志文姚幼鸣
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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