Outdoor
Vacuum circuit
breaker

The OVX overhead line vacuum circuit breakers is clearly the most modern and safe product of its kind on today's market. It is built to remain in operation for more than 30 years without major maintenance. OVX has built-in current transformers and 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.

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

HUGHES OVXDESCRIPTION

Hughes OVX series of vacuum interrupter circuit breaker series is designed and manufactured in Sweden. It is built for use on overhead distribution lines for recloser applications as an advanced Smart Grid building block.

OVX can be equipped with Hughes control units for a simple remote control or with Hughes recloser control unit to form a recloser/sectionalizer. 

The OVX series model range:

  • For 6/12kV OVX120 model of vacuum circuit breaker equipped with 12kV bushings, built-in disconnector and voltage sensors on the load side.
  • For 6/15kV OVX121 model of vacuum circuit breaker equipped with extra insulated 27kV bushings and with 1 or 2 sets of voltage sensors on feed and/or load side;
  • For 22/27kV OVX240 model of vacuum circuit breaker equipped with 24kV bushings, built-in disconnector and voltage sensors on the load side.
  • For 22/27kV OVX241 model of vacuum circuit breaker equipped with 27kV bushings and with 1 or 2 sets of voltage sensors on feed and/or load side;
  • For 33/40kV OVX405 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 vacuum circuit breaker

HUGHES OVXADVANTAGES

The OVX vacuum circuit breaker of the latest generation has the following advantages:

  • Low maintenance. Hughes OVXs 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 the product 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 vacuum circuit breaker

HUGHES OVXCOMPONENTS


THE OVX120 for 6/15kV / OVX240 for 22/27kV VACUUM CIRCUIT BREAKER COMPONENTS:

  • 12kV / 24kV bushings (1) of epoxy with silicone surface;
  • Integrated and synchronized disconnector (2) with visible open points on all 3-phases;
  • Integrated 3x phase current transformers (3) with built-in voltage sensors on load side;
  • High current vacuum breaker element (1), AMF type for 630 or 1250A continuous line load and 20kA fault current in 3 sec
  • Attachment points (6) for down pole mounted disconnector operation handle;
  • Frame (7) made of 5 and 4mm stainless steel to eliminate electrochemical corrosion;
  • Electrical circuit (8) made of high grade copper;
  • Manual maneuvering (9) of both vacuum interrupter and disconnector;

Optional components:

  • Integrated 1x core balance CT (4) for detecting low earth faults;
Hughes vacuum circuit breaker



THE OVX121 for 6/15kV / ovx241 for 22/27kV VACUUM CIRCUIT BREAKER COMPONENTS:

  • Extra insulation with 27kV bushings (1) of epoxy with silicone surface with built-in voltage sensors on feed side;
  • Integrated 3x phase current transformers (2);
  • High current vacuum breaker element (4), AMF type for 630 or 1250A continuous line load and 20kA fault current in 3 sec;
  • Frame (5) made of 5 and 4mm stainless steel to eliminate electrochemical corrosion;
  • Electrical circuit (6) made of high grade copper;
  • Manual maneuvering (7) of vacuum interrupter;

Optional components:

  • Integrated 1x core balance CT (3) for detecting low earth faults;
  • Voltage sensors on load side;
Hughes vacuum circuit breaker



The OVX405 for 33/40kV vacuum circuit breaker components:

  • ABB VG10 2000A/20kA 40.5kV vacuum interrupter (1);
  • Integrated 3x phase current transformers (2);
  • Integrated voltage sensors (3) on load side;
  • High current vacuum breaker element (1), RMF type for 1200 A continuous line load and 16 kA fault current in 3 sec
  • 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 vacuum circuit breaker

OVX120 / 240ELECTRICAL DIAGRAM

Hughes Power System outdoor vacuum circuit breaker

OVX121 / 241 ELECTRICAL DIAGRAM

Hughes vacuum circuit breaker

OVX405 ELECTRICAL DIAGRAM

Hughes vacuum circuit breaker

HUGHES OVXINSTALLATIONS


The OVX120/121/240/241/405 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)
  • Recloser control cabinet (4)
Hughes vacuum circuit breaker



OVX405 can installed as one of the blocks of a switchgear scheme.
The installation includes below elements in the following sequence:

  • Voltage transformer (1)
  • Vacuum circuit breaker (2)
  • Recloser control cabinet (3)
Hughes vacuum circuit breaker

HUGHES OVXTECHNICAL DATA

Description ovx120/121 ovx240/241 OVX405
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 Winding 1 Winding 2 Winding 3
Phase CT type 1 200/1 400/1 600/1
Core balance CT  20/1    
Description      
Design min
mechanical/electrical
20.000 20.000 15000
Dimensions (LxWxH), mm 882x793x775/
872x370x775
882x772x957/
872x370x900
1410x621x
1070
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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