High-Performance Vacuum Circuit Breaker for Reliable Electrical Protection Zw20

• Customization: Available
• Breaking Capacity: High Voltage Circuit Breakers
• Operation: Electric Type
• Model NO.: ZW20-12/T630-25
• Speed: Normal Type Circuit Breaker
• Arc-extinguishing Medium: SF6
• Installation: Fixed
• Structure: Box Type Sealing Structure
• Poles Number: 3
• Type: Circuit Breaker
• Function: Conventional Circuit Breaker, Circuit-Breaker Failure Protection, Overcurrent Protection, OVP(Overvoltage Protection), RCCB
• Certification: ISO9001-2000, CE, CCC
• Transport Package: Export Standard Wooden Case
• Specification: 1350*950*900
• Trademark: Ampower
• Origin: China
• Production Capacity: 100 Pieces/Week

Product Description

1.Overview
ZW20-/630-20 series outdoor vacuum circuit breaker is the use of vacuum extinction chamber to quench the arc, with SF6 gas as the insulating medium. Rated voltage 12kV, 15kV, 24kV, three-phase AC 50/60Hz outdoor power distribution equipment. It is mainly used to break and close the load current, overload current and short circuit current in the power grid. It can directly cut out the fault main line and large branch links, with reclosing function. The switch body, the control unit and the voltage transformer are connected by military-grade aviation connectors through outdoor fully insulated cables.
It is suitable for substations, industrial and mining enterprises, rural power grid distribution system for protection and control and frequent operation of the site. The product is compatible with the controller and can meet the requirements of the distribution automation system.
2. Environmental conditions for use
a . Altitude: no more than 2,000m;  Pollution class: Grade IV.
b . Ambient air temperature: -40°C~+40°C; Daily temperature difference: Diurnal variation 25°C.
c . The wind speed shall not be greater than 35m/s; The earthquake was no more than a magnitude 8.
d. No inflammable, explosive danger, chemical corrosion place.
When the conditions of use exceed the above scope, the permissible scope and technical measures shall be determined through consultation with the supplier.

3 Product model and definition

4.Main technical parameters

S/N	Name	Unit	Parameter
1	Rated Voltage	kV	12	15	24
2	Rated Current	A	630, 1250
3	Rated Frequency	Hz	50/60
4	Rated short-circuit breaking current (effective value)	kA	20, 25
5	Breaking times of rated short-circuit current	Times	30
6	Rated peak withstand current (peak)	kA	50, 63
7	Rated short-time withstand current (4S)	kA	20, 25
8	Rated short-circuit closing current (peak)	kA	50, 63
9	1min power frequency withstand voltage (inter-phase, over the ground/fracture)	kV	42/48	50/55	65/79
10	Lightning impulse withstand voltage (peak) inter-phase, over the ground/fracture	kV	75/85	88/100	125/145
11	Mechanical life	Times	10000
12	Rated operating sequence		0-0.3s-C0-180s-CO
13	SF6 rated gas pressure (gauge pressure)	Mpa	0.045
14	SF6 annual leakage rate	≤	0.5%

5.Mechanical characteristic parameters
 

S/N	Name	Unit	Parameter
1	Rated Voltage	kV	12	15	24
2	Clearance between open contacts	mm	9±0.5	11±0.5	14±0.5
3	Over-travel of contact	mm	3±0.5	3±0.5	3±0.5
4	Average opening speed	m/s	1.1±0.2	1.2±0.2	1.4±0.2
5	Average closing speed	m/s	0.6±0.2	0.8±0.2	1.0±0.2
6	Closing contact bounce time	ms	≤2
7	Resistance of each phase loop	μΩ	≤120 with isolating switch≤200
8	Closing time	ms	25~60
9	Opening time	ms	18~45
10	Three-phase heterogeneity	mm	≤2
11	Inter-phase center distance	mm	280	280	340