Fuzzy comprehensive diagnosis method for high-voltage shunt reactor based on dissolved gas in oil

Abstract

The invention relates to a fuzzy comprehensive diagnosis method for a high-voltage shunt reactor based on dissolved gas in oil. The method comprises the following steps that step 1 delta=max(b1, b2 to b9) is computed according to b=(b1, b2 to B9), wherein b=coR, b is a diagnosis result set, c is a weight vector, o is a generalized fuzzy operator and R is a fuzzy relation matrix between encoding and fault types; step 2 if bj is not less than delta / 2, the fault type fj corresponding to the bj belongs to A(suspicious fault set), j=1, 2 to 9, and bj is credibility of the jth fault; step 3 if the degree of membership corresponding to any Ri in a set of Ri corresponding to all nonzero rij in the jth row of elements in a matrix R is not equal to 0, the fault fj probably exists, and the possible fault type fj belongs to B(suspicious fault set); and step 4 an intersection of A and B is a true fault reason set. The method adopted by the invention does not need a large amount of fault diagnosis sample database and is easy to realize programming, and the fault diagnosis of the high-voltage shunt reactor can be quickly and accurately carried out according to the dissolved gas in oil.

Description

technical field [0001] The invention relates to the field of on-line monitoring and fault diagnosis of electric equipment, in particular to a fuzzy comprehensive diagnosis method for a high-voltage shunt reactor based on dissolved gas in oil. Background technique [0002] With the rapid development of society and economy, the power system plays an increasingly important role in the national economy. With the improvement of voltage level and the increase of installed capacity, users have higher and higher requirements for power supply quality and reliability, which puts forward higher requirements for power equipment monitoring and diagnosis technology. At present, the 500kV power grid has gradually developed into the backbone power grid within the system. The high-voltage shunt reactor can reduce the capacitive current flowing through the line, limit the power frequency overvoltage level of the system and suppress the sneak supply current, and its safety and stability direc...

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Problems solved by technology

When the improved ratio method is used for high-voltage shunt reactor faults, on the one hand, although the insulation design of the transformer and the high-voltage shunt reactor is similar, but the working principle and working conditions are different, the improved three-ratio method is not suitable for direct application to the high-voltage shunt reactor. Fault diagnosis; on the other hand, the ratio of the improved three-ratio method is single and accurate, and there are not many codes for the ratio range. In practice, it is often impossible to judge the fault because the ratio range cannot be found, and the code and the fault type are strictly corresponding. , the code-fault matrix thus determined is an ordinary relationship matrix composed of elements 1 or 0, where 1 indicates that the code belongs to this type of fault, and 0 indicates that the code does not belong to this type of fault. The corresponding relationship is clear and concise, but the fault The relationship between type and code itself is fuzzy, often one fault state may cause multiple fault features, and one fault feature can also reflect multiple fault states to varying degrees, that is, there are a lot of uncertainties in fault diagnosis, Specifically manifested as randomness and fuzziness

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