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ZN-28 series high voltage vacuum circuit breaker

General Description:

ZN28 series high voltage vacuum circuit breaker is three-phase AC 50Hz indoor high voltage power distribution equipment with rated voltage of 12kV and below. Fitted in GG-1A(F), XGN2, JYN2, KYN1 type switchgear, it is suitable for the control and protection of power transmission and distribution system such as power station, substation etc,especially used in the field where it is operated frequently.

The product have three types: the separation type, fixed type, and withdrawable type. It can be equipped with electromagnetic operating mechanism or spring operating mechanism.

Applying ambient conditions:

1. The elevation should be no higher than 1000m.
2. Ambient temperature: The max. temperature should be +40C. The min. temperature should be -10C.
3. Relative Humidity: The average humidity of a day should be no more than 95%. The average humidity of a month should be no more than 90%.
4. Saturated Vapour pressure:The average saturated vapour prereure of a day should be no more than 2.2×10-3 Mpa; The average saturated vapour prereure of a day should be no more than 1.8×10-3 MMpa.
5. It should be used in the places without fire, explosion, serious filth, chemical erosion and violent vibration.

Specification sheet :

Name	Unit	Data
Rated Voltage	kV	12
Rated current	A	1250 1600 2000 2500 3150
Rated power-frequency withstand voltage	kV	42
Rated lighting impulse withstand voltage	kV	75
Rated short-circuit breaking current	kA	20 25 31.5 40
Rated short-circuit making current	kA	50 63 80 100
Rated duration of short circuit	S	4
Operating cycles at rated short-circuit breaking current	Times	30
Mechanical endurance	Times	10000
Closing time	ms	<100
Opening time	ms	<60
Rated single capacitor bank breaking current	A	630
Rated back-to-back capacitor bank breaking current	A	400

Main Technical Specification of Operation Mechanisms

The Construction Characteristics:

Adoption of axail megnetic field vacuum interrupter provides vacuum circuit-breaker with higher breaking capacity and current capacity to get better technical specifications within smaller space.Used CAD design and introduced international advanced technlogy, each optimistic design in detail of the product meets the requirements of domestic conditions and world standard.Three kinds of vacuum circuit-breaker are provided to meet various requirements of customers: separated type, fixed type and withdrawable type.The products have a complete specification to meet the requirements of various level of current and breaking current. We can also provide non-standard products according to the special requirement of customers.

Overall Dimension :