1 Overview

ZW7-33type of outdoor high voltage vacuum circuit breaker using integral unique design of embedded pole and high reliability of the operating mechanism. The device is mainly used in medium voltage overhead power grid，As, Load current, overload current and short-circuit current.

High reliability u

U maintenance free completely in the whole life period

U has high mechanical life

U small size, light weight, easy to install

1.1 conditions of use

The ambient air temperature: -30 to +60 DEG c;

The altitude: not more than 3000 meters;

The wind speed is less than 34m/s

"From the switchgear and control equipment of external vibration or earthquake can be ignored;

"The pollution level IV;

1.2. Technical parameters

Main technical parameters of circuit breaker

The main mechanical parameters of circuit breaker

2 the structure and working principle of circuit breaker

ZW7-33 type of outdoor high voltage vacuum circuit breaker is mainly composed of an integrated solid sealed pole, Current transformer, The actuator and a box body. This type of circuit breaker is designed for miniaturization, The shell is made of high quality steel box. The current transformer can according to the needs of users.

ZW7-33 intelligent outdoor high voltage vacuum circuit breaker and matched control group. On the realization of on-off switch operation, Can also be through the communication interface by the remote operation. Other information about the circuit breaker can also be transmitted to the control center, You can choose a communication channel, cable, fibre-optical GPRS / CDMA，GSM等。The working principle of the 3 circuit breake

3.1 arc extinguishing principle: ZW□-33outdoor high voltage vacuum breaker adopts vacuum arc extinguish chamber ，Vacuum is used as arcing and insulating medium, Having a high degree of vacuum。When moving, The static contact in the operating mechanism under the action of charged gate, A vacuum arc will occur between the contacts, Simultaneous, Because of the special structure of the contact, An appropriate longitudinal magnetic field is also generated in the clearance of the contact，The vacuum arc is maintained as diffusion type, The arc is uniformly distributed on the contact surface, Maintaining a low arc voltage，When the current is past zero, Residual ion, The electron and metal vapors can be combined or condensed on the contact surface and shield in the order of microseconds, The dielectric strength of the fracture in the arc chamber of electron and metal was quickly restored, Thus the arc is extinguished to achieve the purpose of breaking。Due to the control of vacuum arc with longitudinal magnetic field, So the vacuum breaker has a strong and stable current breaking capacity。

3.2 electric energy storage:A motor that outputs torque acting on the pinion of the mechanism, The big sprocket drive to the spindle,So as to drive the arm rotation, The closing spring energy storage.

When the crank arm screws on the pressure trip switch, Cut-off motor power supply, The spring is stored

3.3 manual energy storage: Output shaft rotation mechanism, The big gear rotating torque transmission gear meshing to small fully through the small gear on the output shaft, So as to drive the arm rotation, The closing spring energy storage.

3.4 closing electromagnet operation: After receiving the closing signal of the mechanism, Closing electromagnet moving core upward movement, Push rod closing release upward movement, The closing half axle counter clockwise. The lifting of the closing latch constraint, Meanwhile, The closing latch by roller pressure, rotate counterclockwise, Lift storage maintenance, Located in the cam on the shaft impact due to contraction of the closing spring, Hit the manual energy storage shaft(ie output shaft) The rocker arm, Through the connecting rod transmission to switch, In order to complete the closing operation.

3.5 manual operation: Installed in the closing fork axle of the counterclockwise rotation, Drive axle on counterclockwise rotation. In order to have the same effect with the closing electromagnet operation.

3.6 closing operation: The release mechanism of energy storage spring energy, Closing operation, In the closing state,The mechanism then performs energy storage operations, Complete storage operation, Have the energy storage mechanism is in the closing state，In this state, once the correct signal is received, Institutions can achieve an automatic reclosing operation.

3.7 brake electromagnet operation: After receiving the gate signal, The movable iron core of the gate electromagnet moves upwards, Forward the brake release rod for upward movement, The brake axle counter clockwise. Lift the latch on the brake constraint. MeanwhileTripping latch, roller by oppression and counterclockwise rotation,The rocker switch due to internal brake spring thrust and counter clockwiseSo as to complete the brake operatio

3.8 manual operation: Installed in the brake axle fork rotates counterclockwiseThat drives the tripping half axis along the counter clockwise direction, To produce and brake electromagnet operation the same effect.

3.9 overcurrent tripping operation: When the overcurrent tripping device overcurrent tripping current coil through the provisions of the,

Electromagnet, Push rod trip release leverMake the brake separation half shaft rotating counterclockwise, Lift the latch on the brake constraint and tripping electromagnet operation resulting in the same effect,

Complete the overcurrent trip circuit breaker.

The 4. circuit breaker size map