Bias magnetic arc suppression coil complete set

According to the minimum residual current value or detuning degree preset, the magnitude of the inductance current that the arc-suppression coil should output is judged, and the arc-suppression coil power is adjusted after grounding fault occurs. Resistance value, output compensation current.

The residual current at the fault point can be limited to a set range to effectively extinguish the arc and ensure the safety of the power supply system.

• The compensating and adjusting mode of the complete set of biasing magnetic arc-suppression coil is with adjusting, that is, monitoring and calculating the current of the power grid when the arc-suppression coil is grounded before the single-phase grounding occurs; when the single-phase grounding fault occurs, the DC exciting current is applied to change the reluctance of the iron core, adjust the reactance value at the speed of milliseconds, and output compensation. Compensation of current.

• The magnetic bias arc suppression coil is a fully static structure with no moving parts and contacts in it. It has large adjusting range, high reliability and fast adjusting speed (ms order of magnitude).

• The magnetic bias arc suppression coil adopts the dynamic compensation method which avoids the resonance point and has no series resonance. That is to say, the arc suppression coil is tuned to a state far from the resonance point without applying excitation current when the power grid is in normal operation, but the capacitive current of the power grid is detected in real time, and the arc suppression is adjusted instantaneously when the power grid is grounded by a single phase. The coil achieves ideal compensation state.

• The complete set of biasing magnetic arc suppression coil device is generally composed of grounding transformer, biasing magnetic arc suppression coil itself, microcomputer controller, control panel, current transformer, voltage transformer, lightning arrester, isolation knife switch, etc.

• 6 kV and 10 kV system control cabinets without smoothing reactors; 35 kV and 66 kV system control cabinets with smoothing reactors.

• The compensation system of generator neutral point arc suppression coil does not need additional grounding transformer.

• If 35kV and 66kV systems have neutral points, there is no need for additional grounding transformers.