electrical outdoor vacuum circuit breaker

Product Description

Hzw20-12 outdoor vacuum circuit breaker for boundary between users, is an Ideal equipment solving large area outage problem lead by the fault happened in single user. The outlet side of the device is built-in zero sequence current transformer, used with separation controller coordinately. It is installed on T junction of 10 kv overhead distribution lines or user end, can realize automatic removal of single-phase earth fault and automatic isolation for phase-phase short circuit fault, ensure electricity safety of the users without fault, is suitable for protection and control for the transformer substation, industrial and mining enterprises, rural power distribution system and the frequent operation places.

Features:

1.Superior whole structure

The device Hzw20-12 outdoor vacuum circuit breaker for boundary between users uses box-type sealing structure. It has good sealing performance and is a maintenance-free product. The shell is stainless steel.

2. Easy and flexible for operation

Power-driven Automatic energy storage, remote control switch on and off, manual energy storage meantime and manual separate and close function.

3. High control degree of automation

Remote control from close distance and GPRS remote control can be realized.

4. Good insulation property

Using Vacuum interrupting chamber, compound insulation.

5. Flexible installation

Using mounted installation on pole or seat installation. It’s convenient and flexible.

Technical Parameters:

Item	Name	unit	parameters
1	Rated voltage	kV	12
2	Rated current	A	630
3	Rated frequency	Hz	50
4	Rated short-circuit breaking current(effective value)	kA	20
5	breaking times of rated short-circuit current	Times	30
6	Rated peak withstand current(peak)	kA	50
7	Rated short-time withstand current(4S)	kA	20
8	Rated short-circuit close current(peak)	kA	50
9	1min power frequency withstand voltage(phase-phase, to earth/fracture)	kV	42/48
10	Lightning impulse withstand voltage peak(phase-phase, earth/fracture)	kV	75/85
11	Mechanical life	Times	10000
12	rated operating sequence seperate-0.3s-separate and closing-180s-separate and closing
13	weight of switch	kg	150
14	volume of switch(including packing case) 1300mm×900mm×880mm

Mechanical characteristic parameters

Item	Name	Unit	Parameter
1	Clearance between open contacts	mm	9+1.0-0.5
2	Contact over travel	mm	3+1.0-0.5
3	Average closing speed	m/s	1.2±0.2
4	Average opening speed	m/s	0.6±0.2
5	Closing contact bounce time	ms	≤2
6	Each phase loop resistance(terminal type/cable type)	μΩ	≤120/500
7	Closing time	ms	25~60
8	Opening time	ms	18~45
9	Three-phase different synchronism	mm	≤2
10	external phases center distance	mm	280

Isolation knife parameters

Item	Name	Unit	Parameters
1	Rated voltage	kV	12
2	Rated current	A	630
3	Dynamic current	kA	50
4	Thermal stability current	kA	20
5	1min power frequency withstand voltage(phase-phase, to earth /fracture)	kV	42/48
6	Each phase loop resistance	μΩ	≤60

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