Circuit Breakers
Circuit breakers are the central part of air-insulated (AIS) and gas-insulated (GIS) switchgear. High-voltage circuit breakers are mechanical switching devices which connect and break current circuits (operating
currents and fault currents) and carry the nominal current in closed position.
As a world market leader, Siemens takes the responsibility to provide circuit breakers which meet the environmental, technological and economic conditions in the various countries worldwide.
The hybrid concept
The hybrid concept combines SF6-encapsulated components and air-insulated devices. The application of gas-insulated components increases availability of switchgear. According to CIGRE analyses, gas-insulated
components are four times more reliable than airinsulated components. The level of encapsulation can be defined in accordance with the requirements of the individual substation layout and the system operator’s
project budget. This leads to optimized investments and can be combined with further air-insulated devices.
Modular Design
Few basic components leading to a high diversity of types
Siemens high-voltage circuit breakers, regardless of type or voltage range, are designed in a well proven modular platform concept. This leads to a high diversity of circuit breaker types and to high flexibility with regard to various applications according to our customers’ requirements.
The main components, such as
- operating mechanism,
- control system,
- base frame,
- kinematic chain and
- insulator designs
are identical and based on decades of manufacturing and operating experience. Our GIS switchgear range also includes the same interrupter units, operating mechanisms and control elements. By applying this proven modular design not only at our lead factory in Germany, but also within our global manufacturing network, we are able to fulfill the highest expectations regarding availability and reliability at eminently competitive prices.
Gas Insulated Switchgear (GIS) Substations
Reliable, flexible, and outstandingly compact
One of today’s main challenges in power transmission is to bring high voltage levels right into the centers of urban areas. This requires switchgear that features a small footprint, the utmost reliability, and very low
noise and electromagnetic emissions. Siemens gas-insulated switchgear (GIS) are ideally suited to meet these requirements. Thanks to their compact design, Siemens GIS need very little space. With more than
45 years of GIS manufacturing experience, the largest installed base of GIS, and a long track record of superior turnkey supply, Siemens is able to provide one-stop GIS substations that also comprise all
secondary technology, procurement, installation and commissioning on-site, and operational training.
The benefits of Siemens gas-insulated switchgear:
- High reliability, availability, gastightness, and high degree of safety
- Economic efficiency, long service life, little maintenance requirements, and low life cycle costs
- Compact design, good accessibility and ergonomics, high degree of adaptability to individual requirements