SWITCHCRAFT

NEWS

	WHILE utilizing the most modern design for Ring Main Units, the GLX24 also features the use of the most advanced manufacturing
technology world wide. With laser cutting and punching machines from TRUMF (Germany), accuracy is guaranteed; the laser welding machine, also from TRUMPF, ensures 100% gas tightness, together with advanced filling and testing devices. Fuse holder and circuit breakers peruse the newest the newest in AGP process. This makes the GLX a world leader in technology.

General | Features | Data | Download

WHILE utilizing the most modern design for Ring Main Units, the GLX24 also features the use of the most advanced manufacturing technology world wide. With laser cutting and punching machines from TRUMF (Germany), accuracy is guaranteed; the laser welding machine, also from TRUMPF, ensures 100% gas tightness, together with advanced filling and testing devices. Fuse holder and circuit breakers peruse the newest the newest in AGP process. This makes the GLX a world leader in technology.

GLX24 has already successfully been type tested in institutes around the world, including KEMA. Designed for MV network up to 24 kV, power stations, all the important industries, the versatile design of the GLX24, in both extendable and compact versions, ensures safe power supply for all.

ADVANCED FACILITIES AND PROCESS

With the laser cutting and punching machines imported from TRUMPF (Germany), the accuracy of re-location can be 0.02mm; the cutting deviation can be less than 0.05mm, which ensures that before welding the gaps between plates of gas tank are smaller than 0.1mm.

The three-dimension and five-axis laser welding system, also from TURMPF, with welding under Helium, welds the stainless steel plates, and the welding quality equals to bended steel plates, which ensure the gas tightness and identity of our gas tanks.

The ITP circuit breakers, ITP fuse holders, outgoing bushings, busbar bushing, and insulators as well as other epoxy resin insulated parts are also manufactured by fully-automatic and digital controlled epoxy resin vacuum mixing/pressure gelatinizing system from Hedrich(Germany).

The busbar connector, cable connector, end-plug and other silicone rubber insulated parts are used by fully-automatic and digital controlled silicone rubber mixing/pressure gelatinizing system from VOGEL(Switzerland).

With the top-ranking partial discharged laboratory, Equipped with ICM compact from PD (Germany), which the system can guarantee the noise level for all-condition of less than 0.5pC, and of the rated voltage up to 150kV, we make all components of our products more higher quality.

Designation			Unit	K-panel	T-panel	L-panel	V-panel	B-panel
Rated voltage			kV	12	12	12	12	12
Power frequency withstand voltage (1min)	Phase to phase/earth		kV	42	42	42	42	42
Power frequency withstand voltage (1min)	Between open contacts		kV	48	48	48	48	48
Impulse withstand voltage	Phase to phase/earth		kV	75	75	75	75	75
Impulse withstand voltage	Between open contacts		kV	85	85	85	85	85
Rated frequency			Hz	50	50	50	50	50
Rated current			A	630	≤200①	630,1250	630,1250	630
Rated short-circuit breaking current			kA			20，25	20，25
Rated short-time withstand current 3s			kA	20		20，25	20，25	20
Rated peak withstand current			kA	50		50，63	50，63	50
Rated short-circuit making current			kA	50		50，63	50，63	50
Marking current( peak)			kA		≤2.5
Rated transfer current			A		1600
Rated active load breaking current			A	630	630			630
Rated close loop breaking current			A	630	630			630
5% rated active load Breaking current			A	31.5	31.5			31.5
Total weight			kg	160	180	200	200	160
Mechanical lifetime			operation	5000	5000	5000	10000	5000
Thickness of plate			mm	3.0
SF6 rated pressure			kPa	30 （在20℃、101.3kPa）
Leakage rate per year				＜0.02%
Water treatment test				24kV 24 hours（under 30 kPa in water）
Arcing Test				20kA 1s
Protection degree		Gas tank		IP 67
		Fuse holder		IP 67
		RMU		IP 4X

	With the introduction of the iSIS, the intelligent Solid Insulation Switchgear family of the Switchcraft Group,new milestones have been created for the medium voltage switchgear industry.
While electrical switchgear advanced from oil insulated circuit breakers to vacuum insulated ones, and from air insulated cubicles to gas insulated ones, Switchcraft takes all these developments further into the future of modern switchgear.

General | Features | Data | Download | Switchcraft patents new technology

SOLID INSULATION

The application of solid insulation materials frees the components from the needs of insulating gases. SF6, with its ideal electrical properties, unfortunately is also a strong hot-house gas, and as gas tight as modern switchgear may be, during handling and over lifetime diffusion, great parts of the gas still escape into the atmosphere. The iSIS does not need any insulating gases for insulation; we apply nitrogen into the enclosures, but only to protect the gear from ageing, dust, moisture and small animals.

TRUE VACUUM APPLICATION

Most circuit breakers offered today claim to be vacuum circuit breakers. This is only half true; while they use a vacuum chamber for arc quenching, the connections to the drives are still air insulated, giving the VCB a weak point and making them big. Switchcraft has changed all that. We will apply vacuum chambers that also fully use the insulating capacities of vacuum, making the chambers much smaller and the VCB much safer. Patents are pending for this innovation.

TRUE VACUUM DISCONNECTORS

Disconnectors in modern gas insulated switchgear represent another unwanted symmetry break in switchgear technology; while the VCB relies on vacuum, the disconnectors rely on gas insulation and rather large distances. In cases of gas leaks, the disconnectors would no longer be safe; their dimensions lead to big sized switchgear. Switchcraft has solved this problem; now, all disconnectors also use special and new vacuum chambers for which patents are also pending. All circuits have two or even three disconnecting distances, one of them visible, and two vacuum devices within them. That makes the iSIS extremely reliable and safe.

TRULY METAL CLAD

With standard metal clad switchgear, the cables, VCB, busbars and secondary compartments had been separated from each other. Switchcraft takes this a step further; all components are metal clad, for each single phase, around their solid insulation. The iSIS is a true building block system, with all components fully insulated and encapsulated. This includes the current, voltage and combined transformers, which can be plugged from various positions. And this holds true not only for single busbar systems, but also for double busbar systems.

STANDARDS		IEC (GB)	IEC (GB	ANSI
Rated Voltage U_r	kV	7.2	12	13.8
Rated A/C withstand voltage U_d	kV	20 (42)	28 (42)	38
Rated Lightning Impulse withstand voltage U_p (BIL)	kV	60 (75)	75	95 (110)
Rated Frequency	Hz	50	50	50
Rated normal current I_r for feeder circuits	A	630-2500	630-2500	630-2500
Rated normal current I_r for circuit breaker	A	630-2500	630-2500	630-2500
Rated normal current I_r for busbars	A	630-2500	630-2500	630-2500
Rated short-time current I_k (IEC 3s, GB 4s)	kA	31.5	31.5	31.5
Rated peak withstand current I_p – up to:	kA	80	80	80
Rated short circuit making current I_ma	kA	80	80	80
Internal arc withstand capability	kA/1s.	31.5	31.5	31.5
Operating sequence	O – 0.3 s – CO – 180 s – CO
Breaking time	ms	60	60	60
Making time	ms	80	80	80
Ambient temperature (w/o secondary)	T	-25°C - +40°C
Same, on special demand	T	- 50°C - +40°C
With reduced current ratings	T	… > +40°C
Relative humidity in % (max.)	%	95
Other standards applied	DIN VDE 0670 part 2 / IEC publ. 62271-102
	DIN VDE 0670 part 4 / IEC publ. 60282
	DIN VDE 0670 part 6 / IEC publ. 62271-100
	DIN VDE 0670 part 101 – 107, IEC publ. 60056
	DIN VDE 0670 part 303 / IEC publ. 60420
	DIN VDE 0670 part 1000 / IEC publ. 60694
	DIN VDE 0670 part 6 – Att. AA IEC publ. 60298
	PEHLA instructions No. 4 / No. 7

	Vacuum Circuit Breaker with embedded poles The SCG type embedded pole circuit breaker can be universally applied within
suitable cubicles installed in power plants, substations, petrochemical plants, metallurgical industries, manufacturing industries, airports and residential areas. The SCG is available in a nearly complete series for medium voltage and for all commonly used rated currents, from 630 A to 4000 A, and for rated breaking current of up to 50 kA.

General | Features | Notes on ordering | Download

The SCG comes in different versions, satisfying the needs of a multitude of customers. Compatible with the industry standards, the breaker can be supplied with pole center distances of 150 mm, 210 mm, and 275 mm (for greater currents, only the wider types may apply). The distance between upper and lower pole contacts can be supplied with 205, 275, or 310 mm, which suits the needs of many panel builders and customers.

The SCG comes with an integrated design, including all standard accessories, and with attractive esthetical features.

The spring actuator is comprised of relatively few components, making the drive more reliable and leading to a higher freedom grade of maintenance.

The special design of the vacuum interrupters and the new materials and geometries used for the contacts result in a very high breaking capacity, high reliability and an overall small resistance (IR = 1250 A, R = 9 ±1 µΩ; IR = 3150 A, R = 7 ± 1 µΩ) of the interrupters as well as for the whole current carrying circuit, including contact arms, contacts and the whole pole (IR ≤ 1250A, R ≤ 45µΩ; IR ≤ 2000 A, R ≤ 35µΩ; IR > 2500 A, R ≤ 20µΩ) .

For a safer power supply:
Main technical data 12 kV and 13,8 kV / 17,5 kV
requires forced cooling. for breaking current < 40 kA, Θ = 0.3 s, for breaking currents ] 40 kA, Θ = 180 s.

For a safer power supply:
Main technical data 24 kV
25.8 kV on request.for breaking current ≤ 40 kA, Θ = 0.3 s, for breaking currents ≥ 40 kA, Θ = 180 s.

Other values on request:

For a safer power supply:
Dimensions for 12 kV and 13,8 kV / 17,5 kV Rated current ≤ 1250 A, and rated short circuit breaking current ≤ 31.5 kA:
Note:
1)     Cooling cover needed for Ir higher than 2500 A
2)     Ir is possible with forced ventilation
3)     Other types, distances and dimensions on request

Vacuum Circuit Breaker with embedded poles OEM and panel builder version The SCGL is a new product developed especially for

secondary network distribution. It combines highest levels of safety and reliability with strong economic features. The cores of the SCGL are the three poles, which are cast in an APG (automated pressure gelatination) process, embedding the vacuum interrupter completely in epoxy resin. By this, the poles are no longer exposed to air or other atmospheric conditions like water or vapor, making it possible to build much smaller circuit breakers. This design also gives the product a much better ability to withstand mechanical shocks.

General | Features | Notes on ordering | Download

Vacuum Circuit Breaker with embedded poles OEM and panel builder version The SCGL is a new product developed especially for secondary network distribution. It combines highest levels of safety and reliability with strong economic features. The cores of the SCGL are the three poles, which are cast in an APG (automated pressure gelatination) process, embedding the vacuum interrupter completely in epoxy resin. By this, the poles are no longer exposed to air or other atmospheric conditions like water or vapor, making it possible to build much smaller circuit breakers. This design also gives the product a much better ability to withstand mechanical shocks. The poles are arranged in linear, not parallel fashion, which enables panel-builders to build much smaller switchboards with it. This kind of arrangement makes it also possible to install lateral current transformers, saving yet more space. The SCGL is mounted on a frame for easy installation. Highlighting an economic solution, it is standardized for fixed-type installation; in special cases draw-out version is also available.

The drives use standard mechanical spring operated drives for stored energy operation. The springs are pre-charged for safe handling; the speed of the interrupter relies solely on the well-defined power of the springs, not on the physics of the human operator. Motor drives, remote control devices and other accessories are of course available. Due to its lateral design and its small dimensions, the SCGL suits the needs of many panel-builders world wide. It is compatible with the industrial standard dimensions and can therefore replace older products with ease. Being hermetically sealed (IEC 60694), the poles make this kind of secondary distribution breaker basically maintenance free.

Ideal switchgear for ideal distribution:

SWITCHCRAFT SCGL
SCGL
Series SWITCHCRAFT
SCGL
Structure Pole housing
Lower contacts (also assembly points for current transformers and current sensors)

Secondary connection terminal. For relay (optional), the drive housing is extended upwards for accommodating the switchgear protection unit.