Analysis of a Dry-type Reactor Fault Based on COMSOL Thermal Field Simulation and High Frequency Pulse Oscillations

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.