Outdoor Medium Voltage SF6 Gas Load Break Switch (LBS)

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Outdoor Medium Voltage SF6 Gas Load Break Switch (LBS)

Pole-mounted load-break switch (Pole-LBS) applies up to 36 kV 400/630 A, 50 Hz Pole-LBS associated with a State-Of-The-Art Controller. This SF6 gas-insulated switch can corporate with the Distribution Automation System, and also isolate a faulted section of distribution line from the Control Center.

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PRODUCT DETAILS
Construction
LBS Controller
Connection

Product description

A simple pole-mounting arrangement contribute to quick and low cost installation, and the switch can be operated manually with a electronic controller. Electronic controller is contained in a stainless steel cabinet for an all weather environmental conditions. Remote monitoring and control can also be provided mounting wire or wireless Modem in a cabinet.

Standard service condition

It shall be principal that this SF6 Gas Load Break Switch shall be used in the following service condition;
3.1.Ambient temperature

3.1.1.Short period peak value : 50℃
3.1.1.Average over a period of 24 hours : 40℃
Lower limit over 24 hours : -25℃

3.2.Relative humidity : 100%

3.3.Maximum altitude : 1,000meter

Features

4.1.SF6 Gas Insulation

4.1.1.SF6 gas is a nontoxic, non-flame-able dielectric with excellent arc quenching property.
4.2.Bushing Versatility

4.2.1.In addition to the standard porcelain bushing, a variety of options are available including elastomeric insulator over epoxy apparatus bushing.
4.3.Visible Open/Close

4.3.1.The color coded main contact position indicator(green-open, red-closed) is easily visible from the ground. The indicator is connected directly to the main contact drive shaft assembly assuring accurate contact status.

4.4.Quick Operation

4.4.1.Spring charged operator is being utilized compression spring to assure quick make and quick-break operation.(<1 Sec.)

4.5.Remote Controllable

4.5.1.Electronic controller is available offering local operation or RTU-interface for master station control.

4.6.Robust Switch 4.6.1.The switch is manufactured from robust, corrosion resistant, proven materials to ensure long service life and also capable of a number of operations which is an ideal characteristic for pole-mounted equipment. 4.7.Standard 4.7.1.Every switch is factory filled, hermetically sealed and production tested according to IEC60265-1(1988) prior to shipment.

Types and Ratings

5.1.Type

Bushing		Terminal Type		Rated Current
Type		Terminal Type		Rated Current
Porcelain bushing	Lug	Conductor: 125㎟	Pt	400A
	terminal	Conductor: 200㎟	Pt	630A
	Mold	Conductor: 125㎟	Pm	400A
	cone	Conductor: 200㎟	Pm	630A
	Lug	Conductor: 125㎟	Rt	400A
Polymer	termina	Conductor: 200㎟	Rt	630A
Rubber	Mold	Conductor: 125㎟	Rm	400A
Bushing	cone	Conductor: 200㎟	Rm	630A

5.2. Symbols of LBS

Pt: Porcelain Terminal	M: Manual	1: 12kV/400A	0: Without
Pm: Porcelain Moldcone	E: Electric	2: 12kV/630A	Surge Arrester
Rt: Rubber Terminal	A: Automatic 3: 24kV/400A		1: With
Rm: Rubber Moldcone		4: 24kV/630A	Surge Arrester

5.3. Types of LBS

Fig.1) Porcelain Bushing – Mold Cone

Fig.2) Rubber Bushing – Mold Cone

Fig.3) Rubber Bushing – Lug Terminal

Fig.4) LBS with Surge Arrester

5.4. Ratings

Products Type	PGS-12	PGS-24	PGS-36
Basic Ratings
Maximum System Voltage	12KV	24KV	40.5KV
Rated Voltage	11KV	20、22、24	30、33、36
Rated Current	400/630A	400/630A	400/630A
Rated Frequency	50/60Hz	50/60Hz	50/60Hz
Short Time Withstand Current	20KA/4sec	25KA/1sec	20KA/1sec
Making and Breaking Capacity
Mainly Active Load Current	630A	630A	630A
Number of Load-break Operations	400times	400times	400times
Short-circuit Making Current (peak)	50KA	50KA	50KA
Numberof Making Operations	5 times	5 times	5 times
Cable Charging Current	25A	25A	25A
Line Charging Current	1.5A	1.5A	2A
Closed Loop Circuit Current	630A	630A	630A
Transformer Magnetizing Current	22A	22A	22A
Power Frequency Withstand Current Test
Wet Condition- 10 sec(Ph- Phips-Eth, Across Interrupters)	45KV	50KV	70KV
DryCondition-1min（Earth, Phase to Earth)	50KV	60KV	95KV
Dry Condition - 1 min( AcrossInterrupter )	50KV	60KV	110KV
Impulse Withstand Current Test( 1.2 x 50 µs )
Phase to Phase, Phase to Earth	85KV	150KV	195KV
Across Interrupter	95KV	150KV	215KV
Other Ratings & Specifications
Internal Arc Test	20kA /0.1 sec	20kA /0.1 sec	20kA /0.1 sec
Arc Extinction Medium	SF 6 Gas	SF 6 Gas	SF 6 Gas
Insulation Medium	SF 6 Gas	SF 6 Gas	SF 6 Gas
Creep age Distance (Porcelain)	550mm	840mm	1055mm
Creep age Distance (Silicon)	610mm	900mm	1250mm
IP Level	54	54	54
Operation Performance
Closing/Opening Time	＜1sec	＜1sec	＜1sec
Mechanical Operations (Guaranteed)	10000times	10000times	10000times
Operating Temperature (*Manual Type)	-25(-40)～70℃	-25(-40)～70℃	-25(-40)～70℃
Gas Pressure
Nominal Pressure (kg/cm2 G, at 20°C)	0.7	1.0	1.0
Bursting Pressure (kg/cm2 G)	4～6	4～6	4～6
Minimum Gas Pressure (kg/cm2 G)	0.05	0.0	0.0
Leakage Rate (cc/ sec)	≤1%	≤1%	≤1%

6.1.Overview of switch and controller (Type:iDA-GRcA-6)

Fig.5) Connection Diagram

6.2. Overview and Dimensions of switch

Dimension(mm)				Installation Dimension（mm）	Packingsize（mm）	Creepdistance of bushing（mm）
	A	B	C	Length×Width	Length×Width×high
12KV	225	435	500	500×390	1100×900×700	556
24KV	300	435	500	500×390	1300×1100×700	840
40.5KV	350	435	500	700×390	1400×1200×700	1250

6.3.LBS Main Body.

6.3.1.SF6 gas insulated switch is a three-phase gang-operation switching device designed for cable and overhead line sectionalizing applications on distribution systems, being operated manually at site or remotely from control center.
6.3.2.Switch tank shall completely sealed by welding and/or rubber -seal gasket, and all components shall be assembled in a welded stainless steel tank.
6.3.3.Switch tank shall be designed to withstand internal pressure without affecting the performance of the switch.
6.3.4.The enclosure of tank is used of the material of the cold rolling stainless steel of over 3mm (STS 304L) or more than equivalent to be able to endure against inner gas pressure and is treated for completely anticorrosive by coating of resin over the enclosure. And the enclosure is the rustless structure by separating bottom side over 10 mm from ground.

6.4. Insulation gas

Fig. 6) Temperature-pressure characteristic curve

6.4.1.SF6 gas used for Pole-LBS is high-pure products and is designed and manufactured to keep below 1,000ppm for water content in gas of main body during loaded current switching.
6.4.2.Considering application temperature range and gas leakage of gas in Pole-LBS, rated pressure, maximum pressure, maximum guaranteed pressure and gas pressure drop locking pressure are as shown in attached

6.5.The factory built-in accessories
6.5.1.Manual operating handle
The LBS is to be safely and easily operated by hot stick for high voltage, and is the structure being completed the on or off by one time operation.

6.5.2.Safety lock device
It is possible to lock the operation apparatus in the position of On or Off, its structure is impossible to electrically and mechanically operate to on or off position in case of locking.

Dwg.2) Safety lock device

6.5.3.Contact position Indicator
The color coded main contact position indicator(green-open, red-closed) is easily visible from the ground.

6.5.4.Low pressure warning device
The automatic locking apparatus is equipped to be impossible for electrical and mechanical On-Off operation in the state of causing a risk when On-Off operation due to the pressure drop(0.4~0.7㎏ /㎠ .G) and there is the indicator being able to easily certify by the operator

Dwg.4) Low pressure warning device

6.5.5.High pressure release device
The gas release apparatus with the structure preventing the demolition of the tank for the safe of operator and common people and that the inner apparatus is not spread to outside in case of sudden rising of the inner gas pressure of the main body due to the internal trouble is equipped.

Dwg.5) High pressure release device

6.5.6.Gas filling valve
The valve is equipped to instill gas in the tank of the main body

Dwg.6) Gas filling valve

6.5.7.Grounding Terminal
Its structure is easily connect with the copper cable of 22mm² ~ 38mm² without the extra auxiliary clamp

Dwg.7) Grounding terminal

6.5.8.Lifting lug
The four (4) Handle for transportation are installed on the upper side of the main body

Dwg.8) Lifting lug

6.6. Polymer Rubber Bushing

Fig.7) Rubber bushing

Fig.8) Rubber Terminal & Rubber Mold-cone

6.6.1.The material of the bushings is as of the epoxy and EPDM rubber or porcelain.
6.6.2.Features of the epoxy and EPDM rubber
-Light weight and easy to handle.
-Unbreakable.
-Integrated design with moldcone.
-Excellent Mechanical Strength.
-Self cleaning function.
-Short installation time and maintenance.

6.7.External connection terminal

6.7.1.The insulated cable for high voltage that has the flexibility and weather proof for the mold cone lead wire method is used, the nominal area and composition of core are over 125㎟ (159/1.0) for 400A and over 200㎟ (19/14/1.0) for 630A, and the length required is over 2m.
6.7.2.In case of the terminal type, allowable current for sectional area of the conductor is 630A.

6.8.Operating Mechanism

Dwg.9) Operating Mechanism

Fig.9) Overview of Controller

7.1. The control box shall be manufactured by using stainless steel plate over than 1.5mm thickness and shall have the installing clamps to easily install at the concrete pole

7.2.The controller can operate the pole-LBS by locally or remotely.

7.3.The controller monitors the SF6 gas pressure of pole-LBS.
If gas pressure falls below a pre-set threshold(0.4-0.7kg/㎠ .G), then an SF6 low pressure red lamp is lit on the local panel, and electrical and manual operations are locked out.

7.4. The control box contains the following operation and display device

7.4.1.Operation switch: Close, Open
7.4.2.Operation selecting switch: local/remote
7.4.3.Operation locking switch: Lock/unlock
7.4.4.Rechargeable battery test terminal and test switch
7.4.5.Lamp test switch
7.4.6.Control power switch (on/off) and fuse
7.4.7.LED
-Display of main contact condition: close(red), open(green)
-Display of locking for low gas pressure
-Display of locking for switching operation (Control box/main body)
-Display of condition of recharging part and rechargeable battery

7.5.The rechargeable batter and charging devices are as follows

7.5.1. Rechargeable battery for control power
- This is DC 24V and rechargeable. This makes more than 50 switching operations by just recharging once and contains the rechargeable battery, which has capability that lasts more than 24hour control under failure of AC power.
7.5.2. Rechargeable battery and charging device
- The recharging current necessary for the battery by ambient temperature is controlled automatically. It contains protection circuit from the over-charge and over-discharge.
7.5.3. Test terminal of rechargeable battery
-Terminal for test and the display of charge condition of article are equipped so that the conditions of the battery voltage and of the charging device can be checked under loading/unloadin condition.

7.5.4. Connecting diagram

Dwg.10) Connecting diagram on the lug terminal

Type #1) Insulation Piercing Connector

Type #2) Compression Sleeve

Detail drawing for Pole Mounting Bracket

9.Connection of the cable to the switchgear

9.1.Switch Mounting and Dimensions (Automatic Type)

Dwg.11) Switch Mounting and Dimensions

9.2. Switch Mounting and Dimensions (Manual Type)

Dwg.12) Switch Mounting and Dimensions

10.Surge Arrester

10.1.Overview and Dimension

10.2. Rating

Descriptions	Rating
Rated Arrester Voltage	24 kV
Nominal Discharge current, 8/20 μs	5 kA
Max. Continuous Operating Voltage	10.2 kVrms
Residual Voltage, 8/20 μs	64 kV (at 5kA)
High Current Withstand, 4/10 μs	65 kA
Applicable Design and Test Standard	IEC 60099-4

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