Live tank circuit breaker

GE’s GL 318 live tank circuit breakers for outdoor installations are equipped with third-generation switching chambers and spring mechanisms (FK). These reliable connection chambers operate on the principle of energy-optimized self-exhaust. FK3 type mechanisms are used in circuit breakers with over 180,000 references around the world.

GL 318 mechanisms are reliable and proven in high voltage switchgear, ensuring high mechanical strength and very low probability of repeated impact in accordance with the IEC 622271-100 standard class M2 and C2. The switches have a disconnect option, which allows for quick and easy installation. To simplify maintenance, the closing resistor is located in the same gas volume as the breaker compartment.

Components

GL 318 live tank circuit breakers provide high reliability based in part on high-quality components, including:

• Single pole design.
• Two connection chambers with self-exhaust to the pole.
• FK3 spring mechanism equipped with a position indicator visible from the outside.
• Reliable, temperature-compensated density meter with two-stage signaling and three-color indicator.
• Easy access to the SF₆ filling valve (DILO type).
• Seals designed to operate at temperatures down to -60 °C.
• Hot-dip galvanized steel parts and mechanism housings made entirely of aluminum.

Options

• Standard low voltage equipment, additional equipment available.
• Composite insulators are available.
• Seismic dampers for high seismic requirements can be supplied.
• Pressure relief system for passive protection of both the substation and personnel.
• RPH3 Controller: Pont-on-wave Tripping and Closing Relays.
• CBWatch: a compact and modular solution for circuit breaker monitoring.
• Closing resistors (CL 315D) limiting high and harmful overvoltages.

Installation and maintenance

• Factory setting before shipping – no adjustments necessary during installation or commissioning
• Possibility of dismantling the connection chambers without removing the entire pole

Testing

Live tank circuit breakers meet the requirements of national and international standards. This has been confirmed by comprehensive type tests in accordance with the latest IEC standards.

Quality

GE’s quality (ISO 9001:2008), environmental (ISO 14001:2004) and occupational health and safety (OHSAS 18001:2007) management systems define procedures for the development and production of high-voltage circuit breakers. These systems ensure high quality of products and services, which is confirmed by regular audits.