summary:
The ZW32-40.5 outdoor high-voltage vacuum circuit breaker adopts an integrated solid-sealed pole and a highly reliable operating mechanism. The device is mainly used in medium-voltage overhead line power grid as load current, overload current and short circuit current.
Main features:
A.High reliability;
B. It is maintenance-free and has high mechanical and electrical life during the whole service life;
D. The whole machine is small in size, light in weight and easy to install;
Normal use environment:
◆ Ambient air temperature: - 30 ℃~+60 ℃;
◆ Altitude: no more than 3000m;
◆ The wind speed shall not exceed 34m/s;
◆ Vibration or ground motion from the outside of switchgear and control equipment can be ignored;
◆ Pollution level: Grade IV;
◆ Storage temperature: - 40 ℃~+85 ℃.
Structure and working principle:
ZW32-40.5 outdoor high-voltage vacuum circuit breaker is mainly composed of integrated solid-sealed pole, current transformer, operating mechanism and box. This type of circuit breaker is of miniaturized design, and its shell is made of steel box. Current transformer can be selected according to user needs. ZW32 - 4 0.5 outdoor high-voltage vacuum circuit breaker and matching intelligent control combination. The switch opening and closing operation can be realized locally, and can also be remotely operated through the communication interface. Other information of the circuit breaker can also be transmitted to the control center, and the communication channel can be cable, optical fiber, GPRS, GSM, etc.
Working principle of circuit breaker:
1. Arc extinguishing principle:
ZW32-40.5 outdoor high-voltage vacuum circuit breaker adopts vacuum arc extinguishing chamber, which uses vacuum as arc extinguishing and insulating medium and has vacuum degree. When the moving and stationary contacts are electrically opened under the action of the operating mechanism, a vacuum arc will be generated between the contacts. At the same time, due to the structure of the contacts, an appropriate longitudinal magnetic field will also be generated in the gap of the contacts, which will keep the vacuum arc in the diffusion type, and make the arc evenly distributed on the contact surface to burn, maintain a low arc voltage. When the current naturally crosses zero, the residual ions The electron and metal vapor can compound or condense on the contact surface and the shield in microseconds, and the dielectric insulation strength of the arc chamber fracture will be restored quickly, so that the arc will be extinguished to achieve the purpose of breaking. Because the vacuum arc is controlled by the longitudinal magnetic field, the vacuum circuit breaker has strong and stable breaking current capacity.
2. Electric energy storage:
The motor acts the output torque on the pinion of the mechanism and drives it to the large sprocket on the main shaft, thus driving the crank arm to rotate, so that the closing spring can store energy. When the screw on the crank arm presses the travel switch, cut off the power supply of the motor, and the spring energy storage is completed.
3. Manual energy storage:
Rotate the output shaft of the mechanism, and transmit the rotating torque to the big gear which is fully meshed with the pinion through the pinion on the output shaft, thus driving the crank arm to rotate, so that the closing spring can store energy.
4. Closing electromagnet operation:
After the mechanism receives the closing signal, the moving iron core of the closing electromagnet moves upward, pushing the closing release lever to move upward, so that the closing half shaft rotates counterclockwise. Release the restriction on the closing spring. At the same time, the closing spring rotates counterclockwise under the pressure of the roller to release the energy storage maintenance. The cam located on the main shaft produces impact force due to the contraction force of the closing spring, and collides with the rocker arm on the manual energy storage shaft (i.e. output shaft), which is transmitted to the switch through the connecting rod, thus completing the closing operation.
5. Manual operation:
When the shift fork installed on the closing half shaft rotates counterclockwise, it drives the closing half shaft to rotate counterclockwise. Thus, it has the same effect as the closing electromagnet operation. 6. Reclosing operation:
After releasing the energy of the 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 closed and stored energy state. Once the correct signal is received in this state, the mechanism can realize an automatic reclosing operation.
7. Opening electromagnet operation:
After the mechanism receives the opening signal, the moving iron core of the opening electromagnet moves upward, pushing the opening release lever to move upward, so that the opening half shaft rotates counterclockwise. Release the constraint on the opening switch. At the same time, the opening roller rotates counterclockwise under the pressure of the roller, and the rocker arm rotates counterclockwise due to the thrust of the opening spring inside the switch, thus completing the opening operation.
8. Manual operation:
When the shift fork installed on the opening half shaft rotates counterclockwise, it drives the opening half shaft to rotate counterclockwise, thus producing the same effect as the opening electromagnet operation. 9. Overcurrent tripping operation:
When the overcurrent coil in the overcurrent release passes the specified tripping current, the electromagnet acts and the push rod pushes the tripping rod. Turn the opening half shaft counterclockwise to release the restriction on the opening spring, thus producing the same effect as the opening electromagnet operation, and completing the circuit breaker overcurrent tripping operation.
