Zw8-12 Vacuum Circuit Breaker (Electric)

I. Overview
ZW32-40.5 outdoor high-voltage vacuum circuit breaker adopts a unique design of integrated fixed pole and high reliability operation mechanism. The device is mainly used in medium voltage overhead line network as load current, overload current and short circuit current.

Extremely high reliability
Total maintenance-free throughout life
High mechanical and electrical life
The whole machine is small in size, light in weight and easy to install.

1.1 Conditions of Use
_Ambient air temperature: - 30 ~60;
_Elevation: not more than 3000 meters;
_Wind speed not exceeding 34m/s;
_Vibration or ground motion from the outside of switchgear and control equipment can be neglected;
_Pollution grade: Grade IV;
_Storage temperature - 40 ~+85.

II. Structure and Working Principle of Circuit Breakers
ZW32-40.5 outdoor high voltage vacuum circuit breaker is mainly composed of integrated fixed pole, current transformer, operating mechanism and box body. This type of circuit breaker is designed for miniaturization, and its shell is made of high quality steel box. Current transformer can be selected according to user's needs.

ZW32-40.5 Outdoor High Voltage Vacuum Circuit Breaker and its matching intelligent control combination. The switch can be switched on and off locally, and remote control can be operated through communication interface. Other information of circuit breaker can also be transmitted to the control center. The communication channel can choose cable, optical fiber, GPRS/CDMA, GSM and so on.

3. Working Principle of Circuit Breaker
3.1 Principle of arc extinguishing: ZW32-40.5 outdoor high voltage vacuum circuit breaker adopts vacuum arc extinguishing chamber, with vacuum as arc extinguishing and insulation medium, and has extremely high vacuum. When the dynamic and static contacts are switched off under the action of the operating mechanism, vacuum arc will be generated between the contacts. At the same time, due to the special structure of the contacts, appropriate longitudinal magnetic field will also be generated in the gap between the contacts, which will promote the vacuum arc to remain diffusive, and make the arc uniformly distributed on the surface of the contacts to burn and maintain a low level. When the arc voltage is naturally zero, the residual ions, electrons and metal vapors can be combined or condensed on the contact surface and shielding cover in microsecond order of magnitude. The dielectric insulation strength of the arc extinguishing chamber fracture is quickly restored, thus the arc is extinguished to achieve the purpose of breaking. Because the vacuum arc is controlled by the longitudinal magnetic field, the vacuum circuit breaker has a strong and stable breaking current capability.

3.2 Electric Energy Storage: The motor acts the output torque on the pinion of the mechanism and drives the large sprocket on the spindle, thus driving the rotation of the crankshaft and making the closing spring store energy. When the screw on the arm pushes down the trip switch, the power supply of the motor is cut off and the spring energy storage is completed.

3.3 Manual Energy Storage: The output shaft of the rotating mechanism transfers the rotating torque to the big gear fully meshing with the pinion through the pinion on the output shaft, thus driving the rotation of the crankshaft and making the closing spring store energy.

3.4 Operation of closing electromagnet: After the mechanism receives the closing signal, the moving core of the closing electromagnet moves upward, pushing the closing release rod to move upward, so that the closing half axis rotates counterclockwise. At the same time, the closing sink rotates counter-clockwise under the pressure of the roller to release the energy storage maintenance. The cam located on the spindle produces impact force due to the contraction force of the closing spring, hits the rocker arm on the manual energy storage shaft (i.e. the output shaft), and drives the switch through the connecting rod to complete the closing operation.

3.5 Manual operation: When the fork installed on the closing half axle rotates counter-clockwise, it drives the closing half axle to rotate counter-clockwise. The result is the same as that of the closing electromagnet operation.

3.6 reclosing operation: after releasing the energy of energy storage spring, the mechanism completes the closing operation. In the closing state, the mechanism performs the energy storage operation again. After the energy storage operation is completed, the mechanism is in the state of energy storage. Once the correct signal is received in this state, the mechanism can realize an automatic reclosing operation.

3.7 Switching electromagnet operation: After the mechanism receives the switch signal, the moving core of the switch electromagnet moves upward, pushing the trip rod to move upward, so that the half-axis of the switch rotates counter-clockwise. Release the restraint on the switch sink. At the same time, the switching sink rotates counter-clockwise under the pressure of the roller, and the rocker arm rotates counter-clockwise under the thrust of the switching spring, thus completing the switching operation.

3.8 Manual operation: When the fork installed on the brake half-axle rotates counter-clockwise, it drives the brake half-axle to rotate counter-clockwise, thus producing the same effect as the operation of the brake electromagnet.

3.9 Overcurrent tripping operation: When the overcurrent coil in the overcurrent tripping device passes through the prescribed current, the electromagnet moves and the push rod pushes the release rod. The half axle of the switch is rotated counter-clockwise and the restriction on the switch sine is released, which produces the same effect as the operation of the switch electromagnet and completes the over-current tripping operation of the circuit breaker.

IV. Installation Drawings











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