LBS vacuum
load break switch

LBS type of vacuum load break switches has optional built-in voltage sensors. The model range includes products for 6/15, 22/27 and 33/40kV voltage classes. It is a very reliable and safe breaking element for electrical lines. The live tank construction completely eliminates the occurrence of internal arc faults and the risk of explosion or destruction inside the switch tank. 

Hughes load break switch
  • Non-enclosed switch for extra safety
  • Integrated disconnector for personal safety
  • Operation On and Off without electric power
  • Solid insulated. No harmful SF6 gas
  • Epoxy bushings with silicone surface
  • Frame of "Marine grade" premium stainless steel

HUGHES LBSDESCRIPTION

Hughes LBS series of vacuum load break switches series is designed and manufactured in Sweden. It is built for use on overhead distribution lines for sectionalizer applications or as a very reliable and safe alternative to a disconnector / air break switch.

LBS can be equipped with Hughes control units for remote control.

The LBS series of vacuum load break switches model range:

  • For 6/12kV LBS120 model of vacuum circuit breaker equipped with 12kV bushings, built-in disconnector and optional voltage sensors on the load side.
  • For 6/15kV LBS121 model of vacuum circuit breaker equipped with extra insulated 27kV bushings and with optional voltage sensors on feed side;
  • For 22/27kV LBS240 model of vacuum circuit breaker equipped with 24kV bushings, built-in disconnector and optional voltage sensors on the load side.
  • For 22/27kV LBS241 model of vacuum circuit breaker equipped with extra insulated 27kV bushings and with optional voltage sensors on feed side;
  • For 33/40kV LBS405 model of vacuum circuit breaker equipped with ABB VG10 2000A/20kA 40.5kV vacuum interrupter and voltage sensors on the load side;


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HUGHES LBSADVANTAGES

The LBS vacuum load break switch of the latest generation has the following advantages:

  • Low maintenance. Hughes LBSs are built to remain in operation for more than 30 years without major maintenance due to the highest quality materials used in its construction. 
  • Live tank construction (1). It completely eliminates the occurrence of internal arc faults and the risk of explosion or destruction inside the switch tank. That makes it repairable in case one of the poles is damaged. It provides improved cooling of the vacuum interrupters due to unhindered air circulation. It has the increased creepage distance that allows the use of products in an environment with a 4th degree of atmospheric pollution and cleaning of insulation without dismantling;
  • Solid epoxy insulation (2) of bushings and insulators. Silicon coating provides UV protection, is environmentally friendly, does not contain harmful SF6 gas or oil;
  • Vacuum interrupter bottles (2) that can handle 20kA faults for 3s guarantee long term problem free operation in networks with many high current faults;
  • Highest quality stainless steel (3) is used for most of the parts to minimize electrochemical corrosion. The use of stainless steel in accordance with DIN50049 / 3.1B, thanks to its non-magnetic properties, completely eliminates the occurrence of any kind of corrosion, including electrochemical corrosion over the entire life of the product;
  • Spring stored energy operating mechanism (4). It provides turning On and Off the switch module even in the complete absence of power supply (voltage transformer malfunction, full battery discharge);
  • Manual charging (5) of the spring mechanism as well as switch operation On and Off are possible with the help of maneuvering arms located on a switch body. The spring capacity is enough for the full reclosing cycle (Off - On - Off);
  • Built in disconnector (6) (applicable for 120 and 240 models only) gives visible open points of all three phases for extra safety. The disconnector is synchronized with the vacuum interrupter and cannot be open or closed when the vacuum interrupter is closed;
     
Hughes load break switch

HUGHES LBSCOMPONENTS



The LBS120 for 6/15kV / LBS240 for 22/27kV vacuum load break switch components

  • 12kV / 24kV bushings (1) of epoxy with silicone surface;
  • Integrated and synchronized disconnector (2) with visible open points on all 3-phases;
  • Attachment points (3) for down pole mounted disconnector operation handle;
  • Frame (4) made of 5 and 4mm stainless steel to eliminate corrosion;
  • Electrical circuit (5) made of high grade copper;
  • Manual maneuvering (6) of vacuum interrupter;
  • Spring stored energy operating mechanism (7);
 
Hughes load break switch



The LBS121 for 6/15kV / LBS241 for 22/27kV vacuum load break switch components

  • 27kV bushings (1) of epoxy with silicone surface;
  • Attachment points for down pole mounted disconnector operation handle;
  • Frame (2) made of 5 and 4mm stainless steel to eliminate corrosion;
  • Electrical circuit (3) made of high grade copper;
  • Manual maneuvering (4) of vacuum interrupter;
  • Spring stored energy operating mechanism (5);

Optional components:

  • 1 set of voltage sensors (6) can be installed on feed side;
Hughes load break switch



The LBS405 for 33/40kV vacuum load break switch components:

  • ABB VG10 2000A/20kA 40.5kV vacuum interrupter (1);
  • Integrated 3x phase current transformers (2);
  • Integrated voltage sensors (3);
  • Frame (4) made of 5 and 4mm stainless steel to eliminate electrochemical corrosion;
  • Electrical circuit (5) made of high grade copper;
  • IP67 Control cable contact (6);
  • Manual maneuvering (7) of vacuum interrupter;
  • Spring stored energy operating mechanism (8);
Hughes load break switch

LBS 120 / 240ELECTRICAL DIAGRAM

Hughes load break switch

LBS 121 / 241ELECTRICAL DIAGRAM

Hughes load break switch

LBS 405ELECTRICAL DIAGRAM

Hughes load break switch

HUGHES LBSINSTALLATIONS


The LBS120/121/240/241/405 models of vacuum circuit breaker can be installed on one wooden or concrete pole.

The standard installation includes below elements in the following sequence:

  • Voltage transformer (1)
  • Vacuum circuit breaker (2)
  • Interconnecting cable (3)
  • Control cabinet (4)
Hughes load break switch



LBS405 can installed as one of the blocks of a switchgear scheme.
The installation includes below elements in the following sequence:

  • Voltage transformer (1)
  • Vacuum load break switch (2)
  • Control cabinet (3)
Hughes load break switch

HUGHES LBSTECHNICAL DATA

Description LBS120/121 LBS240/241 LBS405
Rated operation voltage, VDC 24-48-110 24-48-110 24-48-110
Rated maximum voltage, kV 12/15 24/27 40
Rated basic impulse level, P>P, kV 85 145 185
Rated basic impulse level, P>E, kV 75 125 170
Power frequency withstand, Dry, kV 60 60 70
Power frequency withstand, Wet, kV 45 50 60
Rated power, W 40 40 40
Rated continuous current, A 630/1250 630/1250 1200
Rated fault making current, kA 50 50 42
Rated fault breaking current, kA 20 20 16
Cable charging current, A 20/40 20/40 40
Line charging current, A 5/10 5/10 5
Rated fault duration time, s 3 3 3
Contact resistance, VCB, µΩ < 35 < 35 < 40
Contact resistance, ABI, µΩ < 60/NA < 60/NA NA
Network frequency, Hz 50/60 50/60 50/60
Description      
Design min mechanical/electrical 20.000 20.000 15000
Dimensions (LxWxH), mm 882x793x775/
872x370x775
882x772x957/
872x370x900
1410x621x1070
Mass (weight) without air break switch - kg (lbs) 75 (165) 101 (222) 155 (342)
Mass (weight) with air break switch - kg (lbs) 98 (216)/NA 125 (275)/NA NA
Description      
Operating temperature C -45 - +70 -45 - +70 -45 - +70
Humidity 100% at 25 C 100% at 25 C 100% at 25 C
Enclosure IP55-65, non-magnetic stainless steel,
optional painted in RAL or ANSI colour
Bushing type Epoxy core with silicone surface HCEP
Phase to phase distance, mm 280 280 550
Creep distance to ground (disconnector isolator), mm 400/NA 725/NA NA
Creep distance to ground (interrupter isolator), mm 460/1090 960/1090 1310
Max installation altitude at rated BIL, m 3000 3000 3000
Description      
Design specification IEC 62271-100
Marking specification IEEE std C37.60
Operation sequence, no charge 25 ms trip - 50 ms close - 25 ms trip

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