Discharge energy-saving type compensating capacitor device

Abstract

The invention provides a discharge energy-saving type compensating capacitor device, comprising a compensating capacitor, a discharge unit and a three-phase linked power supply main switch. The device also comprises a discharge control unit which comprises a fourth capacitor, a reactor and an intermediate relay, wherein a series circuit formed by the fourth capacitor, the reactor and the intermediate relay coil is used for connecting in parallel with a first phase power supply circuit and a second phase power supply of the three-phase power supply; a first normally closed contact, a second normally closed contact and a third normally closed contact of the intermediate relay are connected in series between each vertex of the discharge unit and the corresponding power supply phase line respectively; and fourth normally closed contacts of the intermediate relay are connected on two ends of the reactor. The three-phase linked power supply main switch is closed; the compensating capacitor is charged; the intermediate relay coil is electrified; the first normally closed contact, the second normally closed contact, the third normally closed contact and the fourth normally closed contactsare disconnected; the reactor is serially connected to reduce voltage; the discharge unit loses electricity without consuming electric energy to achieve the effect of electric energy conservation; and the main switch is disconnected, the intermediate relay coil loses electricity, and the compensating capacitor discharges electricity through the discharge unit.

Description

technical field [0001] The invention relates to the technical field of compensation capacitor devices, in particular to a discharge energy-saving compensation capacitor device that avoids long-term power consumption of discharge devices. Background technique [0002] The compensation capacitor is a kind of energy storage element. When the power is cut off, there is still a high voltage at both ends of the compensation capacitor. According to the rural low-voltage power technical regulations, the terminal voltage of the compensation capacitor should not exceed 75V after one minute of power failure. For this reason, a discharge circuit must be installed, and when the power is cut off, the discharge device is quickly connected to discharge. At present, when many manufacturers install compensation capacitors and discharge circuits, they often use figure 1 In the circuit shown, the three capacitors C1, C2, and C3 are connected in sequence from end to end to form a compensation c...

AI Technical Summary

Problems solved by technology

After analysis, it is found that in this circuit, after the main switch QK of the three-phase linkage power supply is turned on, the three capacitors C1, C2, and C3 enter the charging state, and the discharge devices R1, R2, and R3 are connected at the same time, which consumes electric energy and is wasteful. Electricity phenomenon

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