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GL 308 and GL 309
Live tank circuit breakers for 52 kV and 72.5 kV
Highly Reliable Performance

GE’s GL 308 and GL 309 live tank circuit breakers for outdoor installation are provided with third-generation self-blast interrupter chambers and spring-operated mechanisms. The field-proven interrupter chamber operates on the energy-optimized self-blast principle. This live tank circuit breaker provides a high level of reliability for customers, even under extreme conditions and climates or in highly active seismic areas.

The circuit breakers are preset, pre-filled with SF6 and completely assembled at the factory before shipping. Due to this preassembly, no adjustments are necessary during installation and commissioning of the circuit breaker which allows for quick and easy installation on site with long intervals between maintenance. In addition, the interrupter chamber can be independently disassembled without having to remove the entire pole column.

GE Advantage
Specifications
Drawings

High Quality Components

The GL 308 and GL 309 live tank circuit breakers provide high reliability based in part on high quality components, including:

  • Third-generation self-blast interrupter chamber
  • Pressure relief system for passive protection of both substation and personnel
  • Field-proven, temperature-compensated density monitor with two-stage transducer and three-color dial
  • Easy access to the SF6 filling connection (type DILO)
  • SF6 non-return (check) valve on each pole column
  • Protected opening springs inside each pole column
  • Hot-dip galvanized steel parts
  • Mechanism housing made completely of aluminum
  • Reliable spring-operated mechanism with position indicator clearly visible from outside

Installation and Maintenance

  • Preset at factory before shipping; no adjustments necessary during installation and commissioning
  • Pole units pre-filled with SF6 at factory before shipping
  • Independent disassembly of the interrupter chamber without having to remove the entire pole column
  • Circuit breaker completely pre-assembled before delivery
  • Three-pole operated circuit breakers: pole columns mounted on base frame
  • Single-pole operated circuit breakers: base frame with mounted and wired mechanisms

Advanced Testing

Our live tank circuit breakers meet the requirements of national and international standards. This has been confirmed by comprehensive type tests according to the latest IEC and ANSI standards.

Certified Quality

The entire development and production procedures for our live tank circuit breakers are fully compliant with the latest ISO 9001, ISO 14001 and OHSAS 18001 quality standards. This ensures the high quality of our products and services, which is confirmed by regular audits.

Specifications

Breaker type GL 308 F1/3120/
GL 308 F3/3120
GL 308 F1/3120/
GL 308 F3/3120
GL 309 F1/3120/
GL 309 F3/3120
GL 309 F1/3120
/GL 309 F3/3120
Rated voltage 52 kV 52 kV 72.5 kV 72.5 kV
Rated frequency 50 Hz 60 Hz 50 Hz 60 Hz
Rated normal current up to 2,000 A up to 2,000 A up to 2,000 A up to 2,000 A
Rated short-circuit breaking current up to 31.5 kA up to 25 kA up to 31.5 kA up to 25 kA
Rated short-circuit making current 80 kA 65 kA 80 kA 65 kA
Rated duration of short-circuit 3 s 3 s 3 s 3 s
Opening time 38 ms 38 ms 38 ms 38 ms
Breaking time 50 ms 50 ms 50 ms 50 ms
Closing time ≤70 ms ≤70 ms ≤70 ms ≤70 ms
Average ambient temperature* -30 oC up to +40 oC -30 oC up to +40 oC -30 oC up to +40 oC -30 oC up to +40 oC
Design altitude* 1,000 m.a.s.l. 1,000 m.a.s.l. 1,000 m.a.s.l. 1,000 m.a.s.l.
* Standard values according to IEC; temperatures up to +70 oC and / or higher altitudes available on request

RATINGS

Breaker type GL 309 F1/4031 P
Rated voltage 72.5 kV
Rated frequency 50/60 Hz
Rated normal current up to 3,150 A
Rated short-circuit breaking current up to 40 kA
Rated short-circuit making current 104 kA
Rated duration of short-circuit 3 s
Opening time 29 ms
Breaking time 50 ms
Closing time ≤70 ms
Average ambient temperature* -30 oC up to +40 oC
Design altitude* 1,000 m.a.s.l.
* Standard values according to IEC; temperatures down to -40 oC up to +70 oC and / or higher altitudes available on request

Drawings