An Alarm System for Monitoring Abnormal State of Power Transformer

Abstract

An alarm system monitoring abnormal conditions of a power transformer comprises an ECU, a storage unit, three detection modules and an alarming and display unit. The alarm system is characterized in that the three detection modules comprise the component concentration detection module, the hydrocarbon content detection module and the gas production rate detection module. The component concentration detection module, the hydrocarbon content detection module and the gas production rate detection module are connected with the ECU respectively, receive control instructions of the ECU and feed back related signals to the ECU. The storage unit is connected with the ECU. The alarming and display unit takes charge of externally displaying alarming signals output by the ECU. According to the alarm system monitoring the abnormal conditions of the power transformer, a two-stage judgment process including primary concentration alarming operation and alarming graded operation is adopted, as a result, inaccurate or unstable measurement caused by influences of multiple factors can be avoided to the maximal degree, graded alarming can be realized accurately, and an operator is prompted to carry out corresponding maintenance and the like.

Description

technical field [0001] The invention relates to an alarm system for monitoring the abnormal state of a power transformer, which belongs to the technical field of power transmission. Background technique [0002] With the rapid development of my country's electric power industry, power transformers are developing in the direction of ultra-high voltage and large capacity, and the power grid is also being organized into a huge regional or even trans-regional power grid. A connected grid pattern is taking shape. With the increase of power equipment capacity and the expansion of power grid scale, higher requirements are put forward for the safe operation and power supply reliability of the power system. The transformer plays an important role in the power system and is one of the most important and expensive electrical equipment in the power system. The safety and reliability of its operation is directly related to the safety and stability of the power system. Therefore, improvi...

AI Technical Summary

Problems solved by technology

[0004] As one of the DGA technologies, the three-ratio method has played a certain role in engineering practice, but due to the limited ratio coding, the fault types are only divided into some classic types, which cannot cover all fault types in actual operation. There is ambiguity in the mapping relationship between types. A simple one-to-one mapping cannot fully and objectively reflect the complex coupling relationship between symptoms and faults. There are also some inaccuracies in gas content that may be caused by various factors. Thus forming a misjudgment of the type of failure

At the same time, the current three-ratio method is mainly to judge the type of fault. Since the judgment of the fault type is relatively rough, it does not reveal the fault location and the severity of the fault. Therefore, it is difficult for decision makers to determine a complete maintenance based on the diagnosis results of the three-ratio method. Strategy

[0005] Therefore, it is necessary to improve the current DGA technology to improve the accuracy and stability of diagnosing power transformer faults, and to avoid adverse effects caused by misjudgment operations.

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