Research on Magnetic Field Detection Technology for Interturn Short Circuit Fault in Air Core Reactors

For the power system, ensuring the safe and stable operation of the power system is the focus of attention. As one of the main equipment in the power system, reactors can achieve functions such as reactive power compensation, voltage stability, filtering, power distribution and control, and overvoltage protection, which is an important guarantee for the stable operation of the power system. During long-term operation, reactors are prone to inter turn short circuit faults. When inter turn short circuit faults occur, significant magnetic leakage and short circuit currents can occur, causing a severe increase in equipment temperature and ultimately triggering a fire. When a reactor experiences a turn to turn short circuit fault, it can cause changes in the surrounding magnetic field. Therefore, using magnetic field detection methods can achieve effective detection of reactor turn to turn faults. This article establishes an equivalent circuit and simulation analysis model for the inter turn short circuit of a hollow reactor, and calculates the magnetic field changes caused by the inter turn short circuit through simulation, laying the foundation for the research of magnetic field detection systems.