Products - CHINA·LONGXI ELECTRIC CO.,LTD.

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ZW27K-12 Outdoor HV AC Vacuum Circuit Breaker Type Sectionalizer

Summary

ZW27K-12 outdoor HV AC vacuum circuit breaker type sectionalizer is a kind of user sectionalized switch which is independently researched and developped by our company. It is composed of two main parts of switch body and fault detection controller. These two parts are electrically connected together by aerial sockets and outdoor sealed control cables. The switch has the remote management mode, and has the functions of protection & control and communication.It can reliably judge and detect MA level zero sequence current in or out boundary and short-circuit fault current between phases to remove automatically the single-phase grounding fault and shortcircuit fault between phases. 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: ≤1500m;
2. Ambient temperature: -40℃～+45℃；diurnal temperature rang ≤25℃;
3. Wind speed: ≤34m/s (wind pressure ≤700Pa);
4. Earthquake intensity: ≤grade 8;
5. Relative humidity: monthly average ≤90%; daily average ≤95%. Dew may be condensed in the interior of the tank body when high humidity drop rapidly;
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;
9. Neutral grounding mode: neutral non grounding, neutral grounding via arc-extinguishing coil, neutral grounding via low-resistance.

Model

Technical specification

No.	Item			Unit	Data
1	Rated voltage			kV	12
2	Rated current			A	630
3	Rated insulation levle	1min P.F withstand voltage	Dry test	kV	42
			Wet test (to earth, external insulation)		34
		Lightning impulse withstand voltage(peak)			75
4	Rated frequency			Hz	50/60
5	Rated short-circuit breaking current			kA	20
6	Rated operating sequence				O-0.3s-CO-180s-CO
7	Breaking times of rated short-circuit breaking current			times	30
8	Rated short-circuit making current (peak)			kA	50
9	Rated peak withstand current				50
10	Rated short-time withstand current				20
11	Rated short-circuit duration			s	4
12	Rated operating voltage /rated auxiliary loop voltage			V	AC/DC220
13	Average opening speed			m/s	1.0±0.3
14	Average closing speed				1.0±0.25
15	Contact close-bouncing time			ms	≤2
16	Three-phase opening non-simultaneity				≤2
17	Closing time			ms	25~50
18	Opening time	At highest rated operating voltage			15~50
		At lowest rated operating voltage			30~16
19	DC resistance for each phase loop			μΩ	≤120(200 with isolator)
20	Phase-to-phase spacing(measure from arc chamber’s end)			mm	260±2.0
21	Mechanical life			times	10000
22	Net weight			kg	135(155 with isolator)

Main function features

1. When the fault occurs in T shape branch line junction of 10kV overhead distribution line, or occurs in the inside of end users, and if the fault occurs in the incoming line for feeder switch, or although the fault occurs in the inside of user line switch, all these faults will cause the protection tripping of the outgoing line switch for substation due to ill-timed coordination between the protective action time limit for feeder switch or user line switch and the protective action time limit for the outgoing line switch for substation. If the fault is permanent, and reclosing substation is not successive, an accident occurs in a medium voltage user community will make the whole distribution line outage. This common accident in the power distribution network will cause vicious influence to the society.
2. If a user boundary switch(commonly known as watchdog) is installed in T shape branch line junction or user end(duty boundary point), it can confirm the faults of overcurrent or short-circuit or single-phase grounding after judging and automatically isolate the faults to ensure the safe usage of the electricity in non-fault zone.

Outline and installation dimension