ZN73-12 Fixed Permanent Magnetic Vacuum Circuit Breaker

Product Details

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1.Overview

ZN73(VS1)-12 Indoor high voltage permanent magnet vacuum circuit breaker, hereinafter referred to as the circuit breaker, is a switch-gear for three-phase AC 50/60Hz power system , with a rated voltage of 6-12kV. As a protection and control unit for power grid equipment/industrial and mining enterprise power equipment , it is suitable for frequent operation and has the ability to make multiple breaks and fast re-closures .

The circuit breaker adopts an integrated design of the operating mechanism and the circuit breaker body, which can be used as a fixed installation unit ，It can also be used as a separate handcart when combined with a chassis vehicle .

2.Standards on which the product is based

The circuit breaker complies with the standards of GB1984-1989 AC High-Voltage Circuit Breakers , JB3855-1996 3 .6-40 .5KV Indoor AC High-Voltage Vacuum Circuit Breakers , and DL403-1933 Technical Specifications for Ordering 10-35KV Indoor High-Voltage Vacuum Circuit Breakers . Additionally, it meets the relevant requirements of IEC56 (87 publication) .

3.Environmental conditions for operation

a . Ambient temperature

Maximum temperature: +40°C Minimum temperature: -30°C

b. Ambient humidity

Daily average relative humidity: ≤95%

Monthly average relative humidity: ≤90%

Daily average vapor pressure: ≤2 .2×106 Pa (or ≤2 .2MPa)

Monthly average vapor pressure: ≤1 . 8×106 Pa (or ≤1 . 8MPa)

c . Altitude: not exceeding 1500 meters

d. Seismic Intensity: not exceeding 8 degrees (on the Richter scale for seismic intensity)

e . Operating Environment

No dripping water;

No risk of flammability and explosion;

No chemically corrosive gases;

No severe vibrations .

4. Technical data

The main technical parameters of the circuit breaker are shown in Table 1 .

No.	Project		Unit	Data
1	Rated voltage		KV	12
2	Rated insulation level	1-minute power frequency withstand voltage	KV	42
		Lightning impulse withstand voltage	KV	75
3	Rated frequency		Hz	50
4	Rated current		A	630	1250	1600	2000	2500	3150
5	Rated short-circuit breaking current (Thermal stability) current		KA	20	25
				25	31 .5	31 .5	31 .5	31 .5	31 .5
				31 .5	40	40	40	40	40
6	Rated short-circuit opening and closing current (Dynamic stability) current		KA	50	63
				63	80	80	80	80	80
				100	100	100	100	100	100
7	Rated short-circuit duration		S	4
8	Rated short-circuit breaking times		Times	30
9	Rated operating sequence			O—CO—180S—CO
10	Rated breaking current of a single capacitor bank		A	630
11	Rated back-to-back capacitor group breaking current		A	400
12	Rated closing capacitor bank surge current			12 .5(frequency not exceeding 10000Hz)
13	Total breaking time		ms	80
14	Mechanical lifespan		Times	20000
15	Allowable cumulative thickness of wear for dynamic and static contacts		mm	3

The mechanical characteristic parameters of the circuit breaker are shown in Table 2

No.	Project	Unit	Data
1	Contact opening distance	mm	9±1
2	Over-travel	mm	3.5±0.5
3	Three-phase asynchronous disconnection	ms	≤2
4	Bouncing time of closing contact	ms	≤2
5	Inter-phase center distance	mm	210±1.0（275±1.0）
6	Rated short-circuit breaking current	KA	25	31.5	40
7	Contact pressure of closing contact	N	2400±200	3100±200	4500±200
8	Average closing speed	m/s	0.6±0.2
9	Average opening speed	m/s	1.1±0.2
10	Closing time	ms	≤60
11	Opening time	ms	≤50
12	Main circuit resistance of each phase	μΩ	630A ≤50 1250～2000A ≤40 2500～3150A≤25
13	Rebound amplitude of contact opening	mm	≤2(3)