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Live Tank Circuit Breakers

Home > HV/MV Equipment > Circuit Breakers > Live Tank Circuit Breakers

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GL 310 S, GL 311 S & GL 312 S
Live tank circuit breakers from 100 kV up to 145 kV
Reliable Performance in Low Temperatures

GE’s GL 310 S, GL 311 S and GL 312 S live tank circuit breakers for outdoor installation are designed for temperatures down to -30°C with pure SF6. They feature the latest technologies in interrupter chambers and spring-operated mechanisms. Our latest single-motion technology provides an optimum solution for applications within this range of minimum temperature.

GE’s live tank circuit breakers provide a high level of reliability, even under extreme conditions and climates, or in highly active seismic areas. The circuit breakers are completely assembled and pre-filled at the factory before delivery, allowing for quick, easy installation and commissioning with long intervals between maintenance. Compared to other products in GE ‘s portfolio within the same voltage range, GL 310 S, GL 311 S and GL 312 S circuit breakers needs 15% less SF6 which reduces the environmental impact by 29 tons equivalent CO2.
GE Advantage
Key Features
Specifications
Drawings

High performance

  • Live tank circuit breakers ensure a high level of reliability
  • Even under extreme conditions and climates or in highly active seismic areas, customers can count on live tank circuit breakers made by GE

Right choice for temperatures down to -30°C

  • Three-pole operated mechanism live tank circuit breakers for outdoor installation are designed for temperatures down to -30°C and feature the latest technologies in interrupting chambers and spring-operated mechanisms

Reduced gas mass/ environmental impact

  • SF6 volume reduced by 15% compared to previous version while optimizing the internal volume
  • CO2 equivalence of gas mass reduced by 29 tons

Safety

  • Pressure relief device prevents from injuries and damages in case of over-pressure within the circuit breaker
  • Support frame design ensures personnel cannot be injured by cinematic moving parts
  • Dedicated tools are designed to assemble and disassemble circuit breaker parts in safe condition

Easy Installation and Light Maintenance

  • Preset and pre-filled at factory before shipping - no adjustments necessary during installation and  commissioning
  • Long maintenance intervals
  • Easy access to desiccant bags and simple inspections
  • Two-stage transducer densimeters are within easy reach, on the front side of the circuit breaker, for periodic/regular check       

Quality and Testing

GE's live tank circuit breakers meet the latest versions of national and international standards, such as IEC 62271-100. The entire development and production procedures are fully compliant with the latest ISO 9001, ISO 14001 and OHSAS 18001 quality standards.

High Quality Components

The GL 310 S, GL 311 S, and GL 312 S live tank circuit breakers provide high reliability based on high quality components, including :

  • Interrupter chamber with self-blast system and reliable single-motion technology
  • Reliable spring-operated mechanism with position indicator clearly visible from outside
  • Pressure relief system for passive protection of substation and personnel
  • Field-proven, temperature-compensated density monitor with two-stage transducer and three-color dial
  • Easy access to the SF6 filling connection (DILO type)
  • SF6 non-return (check) valve on each pole column
  • Opening and closing spring in drive
  • Steel support frame design prevents corrosion issues and provides high safety for employees and high protection against environmental ingress (e.g. ice)
  • Optimum designed cinematic between mechanism and interrupting chamber to increase mechanical energy efficiency and mechanical moving parts reliability

Technical Characteristics

  • Spring-operated mechanism / degree of protection : FK 3-1 / IP 55
  • Rated operating sequence : O-0.3s-CO-3min-CO resp. CO-15s-CO
  • Rated supply voltage : From 24 V up to 250 V dc/ac

Product Options

  • CBWatch monitoring system

Specifications

Breaker type GL 310 S GL 311 S GL 312 S
Rated voltage 100 kV 123 kV 145 kV
Rated frequency 50 Hz 50 Hz 50Hz
Rated normal current 3,150 A 3,150 A 3,150 A
Rated short-circuit breaking current 40 kA 40 kA 40 kA
Rated short-circuit making current 100 kA 100 kA 100 kA
Rated duration of short-circuit 3 s 3 s 3 s
First Pole to clear factor 1.3/1.5 1.3/1.5 1.3/1.5
Opening time 27-37 ms 27-37 ms 27-37 ms
Breaking time 50-60 ms 50-60 ms 50-60 ms
Closing time ≤70 ms ≤70 ms ≤70 ms
Average ambient temperature** -30 °C up to +40 °C -30 °C up to +40 °C -30 °C up to +40 °C
Design altitude* 1,000 m.a.s.l. 1,000 m.a.s.l. 1,000 m.a.s.l.
Pollution level** 25 mm/kV 25 mm/kV 25 mm/kV
* Standard values according to IEC. Higher design altitudes available on request
** Other temperatures and pollution levels available on request

Drawings

GL 311/312 S - More phase center distances available on request

GL 311 S/312 S – other phase center distance available on request