Products - CHINA·LONGXI ELECTRIC CO.,LTD.

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Products

ZW20B-12 Type Outdoor HV AC Vacuum Circuit Breaker

Summary

ZW20B-12 type outdoor HV AC vacuum circuit breaker is used to make and break load current, overload current and short-circuit current in the power system with rated voltage 12kV, three-phase AC 50/60Hz. It is applicable to substations, industrial and mining enterprises, unban and rural electric power networks, especially to the occasions with frequent operation and automatic power distribution networks for power network control and equipment protection. The product conforms to the standards of IEC62271-100 & GB1984: AC high voltage circuit breaker, IEC60694 & GB/T11022: HV general technical requirement of switch and control apparatus.

Ambient conditions

1. Altitude: ≤3000m;
2. Ambient temperature: -30℃～+45℃；diurnal temperature rang ≤25℃;
3. Wind speed: ≤35m/s;
4. Earthquake intensity: ≤grade 8;
5． Relative humidity: monthly average ≤90%; daily average ≤95%;
6． Ice thickness: ≤10mm
7. Pollution degree: ≤Ⅳ(GB5582);
8. Applicable occasions: no fire and explosion danger, no chemical corrosion and no frequent severe vibration.

Model

Technical specification

No.	Item		Unit	Data
1	Rated value	Rated voltage	kV	12
		Rated frequency	Hz	50/60
		Rated current	A	630
		Rated withstand current(peak)	kA	50
		Rated short-time withstand current(4s)		20
		Rated short-circuit making current(peak)		50
		Breaking times of rated current	times	1000
		Making times of rated short-circuit breaking current		30
2	1min P.F withstand voltage	Phase to phase, phase to earth	kV	42
		Across open contacts		49
		P.F withstand voltage for secondary loop		2
3	Lightning impulse withstand voltage(peak)	Phase to phase, phase to earth		75
		Across open contacts		85
4	Opening speed		m/s	1.2±0.2
5	Closing speed			0.8±0.2
6	Closing time		ms	20~60
7	Opening time			18~45
8	Contact close-bouncing time		ms	≤2
9	Three-phase opening/closing non-simultaneity			≤2
10	Each phase conductive loop resistance		μΩ	≤120
11	Rated power for energy storage motor		W	≯40
12	Rated voltage for energy storage motor		V	DC24/DC220
13	Rated close-operating voltage			DC24/DC220
14	Rated open-operating voltage			DC24/DC220
15	Rated pressure of SF6 gas (gauge pressure)		MPa	“0”
16	External creepage distance		cm/kV	3.8
17	External charged air insulation distance		mm	240±2
18	Phase-to-phase spacing			135±1.5
19	Mechanical life		times	10000
20	Net weight		kg	145

Main function features

1. Three phases in a common fully sealed body, vacuum arc-extinguishing, N2 gas as external insulation;
2. Built-in silicon rubber cover can ensure the standard of 42kV withstand voltage under the natural conditions. Filling in N2 gas, insulation margin is more fully;
3. Simple and convenient for the users to adjust the CT ratio directly by a change-over switch;
4. Hoisting installation or seat installation is convenient for the switch;
5. The automation interface can be provided with the swich as long as it’s equipped with aviation plugs.
6. The switch can realize the function of recloser after equipped with external PT and reclosing controller.

Outline and installation dimension