Transformer neutral point capacitive DC blocking device
A transformer neutral point and DC blocking device technology, applied in the direction of circuit devices, emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc., can solve problems affecting the safe operation of power equipment and power systems, Transformer operation noise increases, shortens the service life of the transformer and other problems, achieves the effect of high withstand voltage, eliminating DC current, and improving safety and reliability
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[0020] Such as figure 1 As shown, a transformer neutral point capacitive DC blocking device using large-capacity high-voltage capacitors and BOD protection includes: electric or manual isolating switch QS1, large-capacity high-voltage capacitor C, voltage divider PT, resistor R, discharge gap G, Current transformer ACTA, current sensor DCTA. Electric or manual isolating switch QS1, large-capacity high-voltage capacitor C, current transformer ACTA and current sensor DCTA are connected in series between the neutral point of the transformer and the ground. The voltage divider PT, the resistor R and the discharge gap G are respectively connected in parallel at both ends of the large-capacity high-voltage capacitor C.
[0021] The DC blocking device also includes a controller, a thyristor valve B, a BOD protection device and a damping reactor L, and the thyristor valve B and the damping reactor L are connected in parallel at both ends of a large-capacity high-voltage capacitor C a...
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