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

A technology of isothermal relaxation current and temperature sensor, which is applied in the direction of measuring electrical variables, testing dielectric strength, instruments, etc., which can solve the problem of inability to evaluate the insulation state of bulk resistivity, leakage current dielectric loss angle tangent, and incomplete evaluation technology methods and equipment. and other problems to achieve the effect of ensuring mechanical damage and high detection accuracy

Active Publication Date: 2017-04-26
STATE GRID HEBEI ELECTRIC POWER RES INST +2
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  • Application Information

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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 t

Method used

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

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[0031] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0032] As attached figure 1 with 2 As shown, a device that uses isothermal relaxation current to evaluate the aging state of the fluorescent optical fiber temperature sensor sheath in a transformer includes a fixture for clamping and fixing the optical fiber and an isothermal relaxation current measurement and control system; the fixture includes a synchronous adjustable three-jaw card with conductive rubber The disc 1 and the insulating support 3 arranged under the synchronously adjustable three-jaw chuck 1 with conductive rubber; the isothermal relaxation current measurement and control system includes an aluminum foil layer 5 coated on the outside of the fluorescent optical fiber temperature sensor sheath 4, and the fluorescent optical fiber The first electrode 6 and the second electrode 7 connected to the aluminum foil layer 5 at different positions on the te...

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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...

Claims

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Application Information

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IPC IPC(8): G01R31/12
CPCG01R31/1263
Inventor 高树国高骏范辉潘瑾陈志勇刘宏亮
Owner STATE GRID HEBEI ELECTRIC POWER RES INST
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