Products - CHINA·LONGXI ELECTRIC CO.,LTD.

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Products

ZWHA-24 Type Outdoor HV AC Vacuum Circuit Breaker

Summary

ZWHA-24 series 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 24kV, 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: ≤2000m;
2. Ambient temperature: -40℃～+45℃；diurnal temperature rang ≤25℃;
3. Wind speed: ≤35m/s, equivalent to wind pressure of 700Pa;
4. Earthquake intensity: ≤grade 8;
5. Relative humidity: monthly average ≤90%; daily average ≤95%;
6. Ice thickness: ≤10mm
7. Sunlight intensity: ≤1000W/m2
8. Pollution degree: ≤Ⅳ(GB5582);
9. Applicable occasions: no fire and explosion danger, no chemical corrosion and no frequent severe vibration.

Model

Technical specification

No.	Item			Unit	Data
1	Rated voltage			kV	24
2	Rated insulation level	1min P.F withstand voltage	Dry test		65/79(isolating distance)
			Wet test		50/64(isolating distance)
			Auxiliary loop and control loop		2
		Lightning impulse withstand voltage(peak)			125/145(isolating distance)
3	Rated frequency			Hz	50/60
4	Rated current			A	630、1250
5	Rated operating sequence				O-0.3s-CO-180s-CO
6	Rated short-circuit breaking current			kA	16	20	25
7	Rated short-circuit making current(peak)				40	50	63
8	Rated peak withstand current(peak)				40	50	63
9	Rated short-time withstand current				16	20	25
10	Rated short-circuit duration			s	4
11	Breaking times of rated current			times	1000
12	Breaking times of rated short-circuit breaking current				20
13	Closing time			ms	20~80
14	Opening time	At max. operating voltage			20~80
		At rated operating voltage			20~80
		At min. operating voltage			20~80
15	Complete breaking time				≤100
16	Mechanical life			times	10000
17	Closing power			J	70
18	Rated input power for energy storage motor			W	≤70
19	Rated operating voltage and rated auxiliary loop current			V	DC/AC 220
20	Energy storage time under rated voltage			S	≤8
21	Over-current tripping device	Rated current		A	5
		Tripping current accuracy		%	±10
22	Average opening speed			m/s	1.5±0.2
23	Average closing speed				0.8±0.2
24	Contact close-boucing time			ms	≤3
25	Three-phase opening non-simultaneity				≤2
26	DC resistance for each phase loop(with isolator)			μΩ	≤80(150 with isolator)
27	Allowed accumulative wear thickness for moving and static contacts			mm	3
28	Phase-to-phase spacing				390±1.5
29	Contact self-closing pressure			N	2000±200
30	Net weight			kg	125(155 with isolator)

Main function features

1. The product can be equipped with a protection and metering current transformer to realize 3-sectional type over-current protection and electricity consumption monitoring according to users’ request;
2. The product can be equipped with a built-in remote control device to realize remote operation;
3. Equipped with a reclosing controller, it can realize the function of automatic reclosing.
4. Iron or stainless steel body, manual or electric mechanism is available for free chioce;
5. The product can meet the demands of the users from different regions as it has the norms of miniaturization and plateau types for users to choose.
6. The switch can be equipped with an external isolator according to the users’ request.
7. The operating mechanism can be permanent magnet type which can sensitively and quickly cut off the short-circuit current;
8. All the other functions which the similar products have can be added to the switch according to the users’request.

Outline and installation dimension