On-line monitoring device of transformer winding state and monitoring method thereof

Abstract

The invention discloses an on-line monitoring device of transformer winding state and a monitoring method thereof. The device is used for the on-line monitoring of transformer winding deformation and bad winding contact and comprises an information acquisition unit, a parameter identification unit, a parameter processing unit and a diagnosis monitoring strategy adjusting unit, wherein the information acquisition unit collects voltage and current information on the original side and the secondary side of the transformer in real time by a data channel; the parameter identification unit identifies the winding resistance and leakage inductance parameter of the winding state of a representation transformer by the real-time voltage and current information provided by the signal acquisition unit; the parameter identification unit calculates the deviation value of a parameter value obtained by analysis and identification and a parameter reference value and takes the deviation value as the characteristic quantity which is used for measuring the quality degree of the transformer winding state; the parameter processing unit and the identification unit ensure the real-time monitoring of the transformer winding state; the diagnosis monitoring strategy adjusting unit judges whether the winding has the defect of deformation or bad contact according to the deviation value of the parameter, and takes corresponding monitoring strategy adjusting scheme according to defect types and severity thereof; and the transformer directly stops operating when the defect is serious.

Description

Technical field: [0001] The invention belongs to the field of electric equipment monitoring, and relates to an online monitoring device and monitoring method for transformer winding deformation and winding poor contact, in particular to an online transformer winding state monitoring system composed of a combination of transformer winding characteristic quantity monitoring and a diagnosis system . Background technique: [0002] The traditional winding deformation detection methods include the frequency response method of measuring the frequency response of the transformer and comparing its changes; the low-voltage pulse method of applying low-voltage pulses and comparing the response changes; the short-circuit reactance method of measuring the short-circuit reactance of the transformer and comparing it with historical data. Although these methods have their merits, they also have their own disadvantages. Among them, the frequency response method and the low-voltage pulse meth...

AI Technical Summary

Problems solved by technology

These live test methods have a simple structure, few test items, and require the tested equipment to be insulated from the ground. The sensitivity of the test is poor, and the application range is small, so they have not been widely used.

Images