Shaanxi Yuguang Electric Co.,Ltd

Overview:

ZN12-12 vacuum circuit breaker is independently researched and developed and produced by Shaanxi Yuguang Electric Co., Ltd, which is suitable for indoor high-voltage switch-gear with rated voltage of 10kV and three-phase AC 50Hz, and it is a product manufactured by introducing 3AF technology of Germany Siemens Company.

ZN12-12 series indoor high-voltage VCB we also call it ZN12-40.5 series, and it is of indoor high-voltage power distribution device with rated voltage of 40.5KV, which can match a variety of models of switch-gear. It is available for receiving, controlling, and protecting electric energy in industrial and mining enterprises, power plants, and transformer substations.

 

Advantages:

1.The circuit breaker passed the appraisal of the Ministry of Machinery and the Ministry of Electric Power in August 96^th,which means the quality is absolutely guaranteed.

The circuit breaker mechanism is integrated with the switch, and the special spring energy storage type actuator mechanism can be operated by AC and DC energy storage or manually operated.

With simple structure, strong breaking capacity, long service life, complete operation functions, no explosion danger and easy maintenance, this circuit breaker is suitable for control or protection switch of power transmission and distribution system such as power plant, city power grid, substation, etc. It is especially suitable for breaking important loads and places with frequent operation.

 

ZN12-12 indoor vacuum circuit breaker use of environmental conditions.

Altitude: not higher than 1000m Ambient temperature: maximum +40 ℃ minimum -25 ℃.

Relative humidity: daily average is not greater than 95%, monthly average is not greater than 90% Seismic cleavage: less than 8 degrees. No fire, explosion danger, no corrosive gas and violent vibration places.

 

ZN12-12 indoor vacuum circuit breaker technical parameters.

 

ZN12-12 indoor vacuum circuit breaker arc extinguishing principle.

In vacuum due to the average free travel of gas molecules is very large, the gas is not easy to produce free, the insulation strength of the vacuum is much higher than the insulation strength of the atmosphere. When the switch opens the gate, the arc is generated between the contacts. The contact surface volatilises metal vapour at high temperature. Due to the special shape of the contact design, a magnetic field is generated when the current passes through, and the arc moves rapidly under the force of this magnetic field. In the metal cylinder (i.e. shield) on the condensation of part of the metal vapour. The arc is extinguished when it naturally passes through zero, and the dielectric strength between the contacts is quickly restored.

This circuit breaker adopts special contact material, which makes the interrupter room have higher opening capacity, lower interception level and long electric life.

 

ZN12-12 indoor vacuum circuit breaker operating mechanism.

6.1 The operating mechanism mainly consists of energy storage mechanism, locking mechanism, breaking spring, switch spindle, buffer and control device, composition.

6.2 The main body of the energy storage mechanism is a shell for the cast aluminium speed reducer box, speed reducer box is two sets of worm gear, energy storage shaft across the speed reducer box, and worm gear worm without mechanical contact. Energy storage shaft on a sleeve, the sleeve with a key connected to a large worm gear, the sleeve has a shaft pin, above the installation of a pawl, in the storage through the right end of the shaft there is a cam, cam on the notch, the pawl through this notch to drive the cam rotation. At the left end of the storage shaft there is a crank, and one end of the closing spring is hung on this crank.

6.3 There is a triangular lever on the pin of the gearbox, and the lever is fitted with a needle bearing so that the energy of the cam-loaded closing spring can be transmitted to this bearing. The other hole of the triangular lever, with a shaft pin connected to a linkage, the other end of the linkage is mounted on the spindle arm, forming a four-link mechanism, the closing force is transmitted to the switch spindle through this mechanism. The shaft pin of the reduction gearbox is also fitted with a needle bearing, which is used as a locking brake.

6.4 In the switch spindle arm is equipped with a split spring, the spindle there are three pairs of arms, two of which are acting on the closing rubber buffer and split brake oil buffer, another pair of arms on a needle bearing as a locking brake with.

6.5 There is identical the closing and opening triggers to this product.