High Voltage Electric Components - High Voltage Vacuum Circuit Breaker

High Voltage Vacuum Circuit Breaker

Outdoor Pole Mounted High Voltage Vacuum Circuit Breaker

Introduction - High Voltage Vacuum Circuit Breaker
ZW8-12/T630-20 Outdoor Pole Mounted High Voltage Vacuum Circuit Breaker is a three-phase AC 50Hz 12kV rated voltage outdoor power distribution device. It is mainly used in opening and closing the load current, overload current and short circuit current of the power system. It suits for the substation and industrial mining enterprises power distribution system for protection and control as well as rural network and other frequently operated places. If combined with the controller, it can meet power distribution automation requirements and reliably and effectively function as the traditional recloser.
Working & Environmental Conditions - Vacuum Circuit Breaker
1. Surrounding air temperature: -40°C~+55°C, daily temperature difference: 25°C
2. Altitude: lower than 2000m
3. Wind pressure: smaller than 700Pa (equals to wind speed 35m/s)
4. No regular dramatic shake, earthquake intensity should smaller than 8 degree.
5. No strong corrosion gas or medium (such as acids, alkali and heavy smoke )
6. Anti-filthy rank: Ⅳ
Technical Parameters - Vacuum Circuit Breaker
Table I
Order Name Unit Parameter
1 Rated voltage KV 12
2 Rated current A 630
3 Rated frequency Hz 50
4 Imin work frequency voltage tolerance Dry test KV 42/49
Wet test 34
5 Lightening impact current tolerance (peak value) alternated, towards the ground/fracture KV 75/85
6 Rated short circuit breaking current KA 20
7 Rated short circuit closing current (peak value) KA 50
8 Rated peak value current tolerance KA 50
9 4S short term current tolerance KA 20
10 Rated operation cycle Open-0.3s-slose-open-180s-close-open
11 Rated times of short circuit breaking current Times 30
12 Mechanical life span Times 30000
13 Secondary circuit I min work frequency voltage tolerance KV 2
14 Protection CT Ratio A ( )/5
Capacity VA 15
15 Weight Kg 180

Table II                                               
Order Name Unit Parameter
1 Contact openness size Mm 11±1
2 Contact excess travel Mm 3+1.0-0.3
3 Average Switch closing speed M/s 0.65±0.15
4 Average Switch opening speed M/s 1.1±0.2
5 Differences of three-phase Switch opening at the same period Ms ≤2
6 Switch closing and bouncing time Ms ≤2
7 Switch closing time Ms ≤60
8 Switch opening time Ms ≤70
9 DC resistance of each phase circuit µΩ ≤200
10 Dynamic, static contacts allowed accumulated attrition thickness Mm 3

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