Abstract
For a single-phase earth fault of 35 kV dry-type reactor, the 5th package area is found with serious turn-to-turn short circuit after it conducts the DC resistance test, turn-to-turn insulation test of high frequency oscillation pulse and rework disassembly. The turn-to-turn short circuit of resistance will lead to wire fusing, which makes the conventional pre-test projects have limitations. With COMSOL finite element thermal field simulation of the fault 35kV dry-type reactor, the temperature distribution result of the reactor indicates that the hottest point is at the 6th package during the reactor operation and the temperature rises 73.75K. In addition, the temperature rises of the 5th, 7th, 14th, 15th package is also higher than other packages, which easily causes device failure due to insulation deterioration. Through the analysis and thermal field simulation of the test for failed reactor, it can provide the reference basis for equipment design, manufacture, daily repair and maintenance.
Highlights
The reactor is a critical SVC device in power system, which plays an important role in the power transport with its excellent electrical performance
Before it develops to a certain degree, it’s hard to be detected by traditional preventive tests, such as DC resistance test, impedance test, infrared detection, and other means
The starting point of the reactor should at the top area, and the area of short circuit develops from the top to bottom that results in aluminum conductor fusing, which stops when it develops to 1/4 height from the bottom
Summary
The reactor is a critical SVC device in power system, which plays an important role in the power transport with its excellent electrical performance. The dry-type air-core reactor develops rapidly recently and has replaced the traditional oil immersed iron core reactor gradually. It features simple installation, light weight, easy maintenance without fire risk, growing a wide market for its application in the power system [1-3]. Above 90% of the reactor fault and burnout are resulted from the turn-to-turn insulation defect [4-6]. The turn-to-turn insulation fault of dry-type reactor is gradually developed by insulation defect during design and manufacture. Before it develops to a certain degree, it’s hard to be detected by traditional preventive tests, such as DC resistance test, impedance test, infrared detection, and other means. It is of great significance to study the thermal field distribution characteristics of the dry reactor
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