1. Arc Extinguishing Principle
The ZW32-40.5 outdoor high-voltage vacuum circuit breaker adopts a vacuum interrupter, using high-vacuum vacuum as the arc extinguishing and insulating medium. When the moving and stationary contacts separate under the action of the operating mechanism while energized, a vacuum arc is generated between the contacts. Meanwhile, the special contact structure forms a proper longitudinal magnetic field within the contact gap, keeping the vacuum arc in a diffused state and enabling uniform arc burning on the contact surface to maintain a low arc voltage. When the current naturally crosses zero, residual ions, electrons and metal vapor recombine or condense on the contact surfaces and shields within microseconds. The dielectric strength of the interrupter gap is rapidly restored, extinguishing the arc and breaking the circuit. Controlled by the longitudinal magnetic field, the vacuum arc enables the circuit breaker to deliver stable and strong current interrupting performance.
2. Motor Energy Storage
The motor outputs torque to the pinion of the mechanism, which is transmitted to the large sprocket on the main shaft, driving the crank arm to rotate and charge the closing spring. When the screw on the crank arm depresses the limit switch, the motor power supply is cut off, completing spring energy storage.
3. Manual Energy Storage
Manual rotation of the mechanism output shaft transmits torque through the pinion to the fully meshed large gear, driving the crank arm to rotate and charge the closing spring.
4. Closing Solenoid Operation
After the mechanism receives the closing signal, the moving core of the closing solenoid moves upward and pushes the closing trip rod upward, rotating the closing half-shaft counterclockwise and releasing the restraint of the closing latch. Meanwhile, the closing latch is pressed by the roller and rotates counterclockwise to release the energy storage hold. Driven by the tension of the closing spring, the cam on the main shaft strikes the rocker arm on the manual energy storage shaft (output shaft) and transmits motion to the switch via the connecting rod, completing the closing operation.
5. Manual Operation
Manual rotation of the fork mounted on the closing half-shaft turns the half-shaft counterclockwise, achieving the same effect as solenoid closing operation.
6. Reclosing Operation
After the mechanism releases spring energy and completes closing, it recharges automatically in the closed state. Once energy storage is finished, the mechanism stays in the closed-and-charged state and supports automatic reclosing upon receiving a valid command signal.
7. Opening Solenoid Operation
After the mechanism receives the opening signal, the moving core of the opening solenoid moves upward and pushes the opening trip rod upward, rotating the opening half-shaft counterclockwise and releasing the restraint of the opening latch. Meanwhile, the opening latch is pushed by the roller and rotates counterclockwise. The rocker arm rotates counterclockwise under the thrust of the internal opening spring, completing the opening operation.
8. Manual Operation
Manual rotation of the fork mounted on the opening half-shaft turns the half-shaft counterclockwise, achieving the same effect as solenoid opening operation.
9. Overcurrent Trip Operation
When the specified trip current flows through the coil of the overcurrent release, the electromagnet actuates and the push rod drives the trip lever. This rotates the opening half-shaft counterclockwise and releases the restraint of the opening latch, producing the same action as the solenoid opening and completing the overcurrent tripping of the circuit breaker.
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