Equipment and method utilizing isothermal relaxation current to evaluate aging state of fluorescence fiber temperature sensor sheath in transformer

Abstract

The invention discloses an equipment and method utilizing an isothermal relaxation current to evaluate an aging state of a fluorescence fiber temperature sensor sheath in a transformer. The equipment comprises a clamp used for fixing and clamping fiber and an isothermal relaxation current measurement and control system; according to the method for evaluating the aging state of the fluorescence fiber temperature sensor sheath in the transformer, a special high voltage polarization electric field is pre-applied to the fiber, after polarization for a time segment, the high voltage polarization electric field is removed, and a depolarization relaxation current is detected; microscopic parameters related to insulation materials and aging factor parameters can be acquired through relevant analysis, and reliable bases are provided for fluorescence fiber sheath insulation state evaluation. The test equipment comprises a DC high voltage source and a microammeter, and voltage output and current detection precision is high; the rich material microscopic performance information in the isothermal relaxation current is utilized, a new surface electrode distribution mode is proposed, and relevant analysis theories are combined; and the test system has a light structure and is convenient to mount and carry.

Description

technical field [0001] The invention belongs to the field of testing and electrical engineering, in particular to a device and a method for evaluating the aging state of a sheath of a fluorescent optical fiber temperature sensor in a transformer. Background technique [0002] The power transformer is one of the most critical equipment in the power transmission network, and its performance plays a vital role in the reliable operation of the entire power grid. During the energy conversion process of power transformers, part of the electric energy is converted into heat energy of the transformer. Higher heat energy will cause the temperature rise of the transformer to be very obvious, which will cause the aging of the transformer insulation material, and eventually lead to the decline of the insulation capacity and life of the transformer. With the continuous improvement of transformer voltage level and capacity, vicious accidents caused by local overheating of windings have oc...

AI Technical Summary

Problems solved by technology

Since the optical fiber temperature sensor is immersed in the transformer oil, it bears a certain electric field in addition to the thermal environment. Without the particularity of conductive conductors, it is impossible to use common aging evaluation techniques such as volume resistivity, leakage current, and dielectric loss tangent to evaluate the insulation state. Therefore, a new method is required to evaluate the aging state of the transformer fiber optic temperature sensor sheath, and There is almost no relevant specialized research on this issue at home and abroad, and there is no perfect and reasonable evaluation technology method and equipment

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