Kylin’s XGN15-12, 12 KV, SF6 Multi-Loop Pad-Mounted Switch applies the most innovative technologies developed by our partner in USA. XGN15-12 is best used in a looped distribution network. Users can choose to equip the switch with RTU, communication devices and controllers, integrating the switch into a distribution automation system. Advanced functions provided by XGN15-12 include fault detection and isolation, protecting apparatus like transformers, CT and PT.

　　

he mechanics of a pad-mounted SF6 switch includes bus bar chamber, loadbreak switch, cable chamber, operating mechanism, interlocking mechanism and meter chamber. 　　Bus Bar Chamber The Bus Bar Chamber is located on the top of the cabinet. In the Bus Bar Chamber, the main bus bars are connected together, extending over the switch cabinet. 　　Loadbreak Switch A 3-position loadbreak switch is located in the switch chamber. The shell of loadbreak is casted by epoxy resin and equipped with a SF6 gas pressure gauge, a convenient gadget for checking if the gas pressure is within the safety range. 　　Cable Chamber The loadbreak switch has a spacious cable chamber for easy access for connecting cables and assemble fuse, arrestor, CT and other components. As a standard feature, the door of the chamber has a viewing window and an interlocking device. The lower cable chamber is equipped with a sealed cover and the cable-tongue with a supporting pole. Both lower portion of the chamber and the door can be removed for assembling cables. 　　Operating Mechanism, Interlocking Mechanism and Meter Chamber The control chamber contains the controlling interlock. The meter chamber contains the spring mechanism of the position indicator and the mechanical interlocking device can also be equipped with auxiliary contact point, opening coil, emergency opening coil, electric capacity electricity indicator, key-lock, motor mechanism device, control circuit, meter, relay and other more accessories. 　　Interlock When the loadbreak switch is closed, the grounding switch is prohibited from closing and the lower door cannot be opened. When the grounding switch is closed, the loadbreak is prohibited from closing. Only after the grounding switch is closed, can the door be opened. When both the grounding switch and cabinet door are closed can loadbreak switch be closed. When the fuse of any phase component melts, the mechanical assembly will open the switch. Under this condition, the loadbreak switch should be closed.

　

In a loop power supplying system, the pad-mounted circuit-breaker is mainly used as the input of main and auxiliary source. The middle cabinet of double source system includes the meter chamber, junction connector chamber, Loadbreak switch chamber, circuit-breaker chamber and the cable chamber. 　　We are able to provide CT, PT, arrestor, grounding switch, relay device for over-current and short-circuit according to meet customer’s requirements. The breaker and loadbreak can be interlocked. A loadbreak with motor operating mechanic, the pad-mounted circuit-break can be equipped with communications gears for tele—metering, tele-control and telecommunication.

　　

ITEM		Loadbreak Switch	Switch and Fuse Integrated Electric Cabinet	Fuse Cabinet
Rated Voltage		12 kV	12 kV	12 kV
Peak BIL of Phase-to-phase and Phase-to-earth (50Hz/1min）		75 kV
Peak BIL of Insulation Breaker		85kV
AC Withstand Voltage of Phase-to-phase and Phase-to earth (1 min)		42 kV
AC Withstand Voltage of Insulation Breaker (1 min)		48 kV
Rated Frequency		50 Hz
Rated Current	Main Busbar	630A，1250A
	Distribute Busbar	630 A，125A, 630A
Rated Short-time Withstand Current	Main Circuit	20kA
	Grounding Circuit
Time of Rated Short-time Withstand Current		4s
Rated Peak Withstand Current		50kA
Rated Loadbreak Breaking Current		630A	-	-
Rated Looping Breaking Current		630A	-	-
Transferred Current		-	1700A	-
Rated Short-circuit Breaking Current		-	31.5kA	20kA
Rated Short-circuit Closing Current		50A	50A	50A
Rated Short-time Breaking Current Breaking Time		100	100	30
Service Life		≥3000	≥3000	≥10000
Grounding Switch Service Life		≥2000	≥2000
Protective Grade		IP3X	IP3X	IP3X

　　
　　
　　The newly released FLN36-12D SF6 loadbreak switch for high voltage system incorporates BKE’s in-depth experience and innovation in its design. It is most suitable for use in both new construction and re-enforcement of urban & rural area distribution systems. This is a 12 KV indoor switchgear, with SF6 gas as the arch-extinction and insulating medium. The switchgear comes with a compact chamber with 3 position closing/opening/grounding positions.
　　BKS has thoroughly tested each and very switchgear individually and thoroughly, ensuring all technical standards are in compliance with or higher than the requirements in GB3804 and GB16926. The salient features are compact, light- weight, low maintenance, longevity, safe to operation, durable mechanical structure and economical.

　　
　　The main circuit of loadbreak switch and its major electric apparatus are sealed in an insulting shell casted with APG technology. The shell is highly insulated and is durable against all adverse environmental conditions. The insulating shell is made of two independent shells and is filled with 0.045 MPA SF6 gas. The lower insulation cover takes a protective measure，so that the high-pressure gas can be released from the protective exploding film when the arch-extinguishing fault is un-detected. In addition, the load break switch has closing, opening and grounding, three positions.

Arch-extinguishing principle 　　The loadbreak switch uses SF6 as the insulating and arch-extinguishing medium when the loadbreak switch opens. The arch will extinct by the magnetic field produced by the permanent magnet. 　　Operating Mechanism 　　The loadbreak switch and its combining electric apparatus have two types of spring-operated mechanism: the K mechanism and the A mechanism. The loadbreak switch with K mechanism is mainly used in coil-in-out unit and those with A mechanism are mainly used in transformer protection. 　　Interlock in the Loadbreak Switch 　　When the Loadbreak switch is closed the grounding switch is prohibited from closing and the lower door can’t be opened. When the grounding switch is closed, the loadbreak is prohibited from closing. When both the grounding switch and cabinet door be closed, loadbreak switch can be closed. 　　When the fuse of any phase in the component electric apparatus opens, the loadbreak switch will be opened. In the particular situation, the loadbreak switch should not be closed manually, nor kept in the close position.

　　

		Loadbreak Switch
Rated Voltage		12kV
Rated Current		630A
AC Withstand Voltage of Phase-to-phase and Phase-to earth (1 min)		42 kV
AC Withstand Voltage of Insulation Breaker (1 min)		48 kV
Peak BIL of Phase-to-phase and Phase-to-earth (50Hz/1min）		75 kV
Peak BIL of Insulation Breaker		85kV
Rated Looping Breaking Current		630A
Rated Loadbreak Breaking Current		630A
Transferred Current		1700A
Rated Cable Charging Current		10A
Rated Breaking Vacant Transformer Content		1600kA
Service Life		≥3000
Rated Short-circuit Closing Circuit		50kA
Rated Short-time Withstand Current	Main Circuit	20kA/4s
	Grounding Circuit	20kA/2s
Rated Short-time Withstand Current		50kA
Rated Pressure of SF6 Gas(20℃)		0.045 MPa
Annual Leakage Rate		≤0.1% per year
Resistance of Main Circuit		≤50uΩ
Different Time of Three Phase Closing and Opening		≤5ms
Opening Speed		≥3.0 m/s
Closing Speed		≥3.0 m/s
Closing Time of Fuse Striking Button		≤50ms