Ferromagnetic resonance occurs in the busbar system – Vernal

Create Date: 2024-8-30 12:03:23|Source: Woehner/Wiehner

The ferromagnetic resonance of the bus system is divided into parallel ferromagnetic resonance and series ferromagnetic resonance. Parallel ferromagnetic resonance refers to the resonance loop composed of the ground capacitance of the bus system and the nonlinear inductance of the bus electromagnetic voltage transformer (primary neutral grounding) in the neutral ungrounded system or the small current grounding system. Series ferromagnetic resonance refers to the resonance loop composed of the voltage equalization capacitor at the break of the circuit interrupter of the high-current grounding system and the nonlinear inductance of the bus electromagnetic voltage transformer.

(1) The result of ferromagnetic resonance: when the resonance is generated, the system will present overvoltage, and the weak part of the insulation will be broken down; lightning arrester fire; The bus voltage transformer is incinerated due to the rapid saturation of the iron core, which causes overcurrent.

(2) Similarities and differences between ferromagnetic resonance and grounding phenomenon: when ferromagnetic resonance occurs, grounding signals will also be presented due to the existence of zero sequence components and higher order components in the power supply voltage, but there is no problem in the practice of the system. At this moment, the change of the voltage relative to the ground is very different from the phenomenon when it is grounded.

                                  Ferromagnetic resonance occurs in the busbar system – Vernal
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