Study on the arc-suppression coil based on sectional TCR

A kind of arc-suppression coil based on sectional TCR is designed to overtake some limitations of preset arc-suppression coils and follow-up arc-suppression coils in application, i.e. tuning mechanics of preset arc-suppression coil is complex and its tuning is slow, while follow-up arc-suppression coil generates abundant harmonic in tuning. The arc-suppression coil has the same reactors in parallel with the thyristors acted as switches. Two schemes to control the arc-suppression coil are proposed. Firstly, one section of reactor generates inductive current by controlling thyristors´ trigger angle, and the other sections of reactors generate inductive current by controlling thyristors fully conducting or fully turning-off. In the control mode, only a small quantity of harmonics is generated and capacitive current of the electric power network can be compensated completely in single-phase grounding fault. Secondly, all the thyristors in parallel with reactors are used as the switches, and harmonic content is generated least. The arc-suppression coil designed is tested in simulator network and the result shows that it has advantages of fast tuning rate, good accuracy of capacitive current measurement. Therefore, it has certain application value and extension potential.