Subestaciones Aisladas Gis 8Dn8

Gas-Insulated Switchgear up to 145 kV, 40 kA, 3150 A Type 8DN8
Answers for energy.

Benefitting from experience

Our 8D type range of gas-insulated switchgear represents a highly successful product concept. Since its introduction back in 1968, Siemens has installed more than 17,000 bays worldwide. More than 230,000 bay-years of operation have since been recorded. Intensive research work andcontinuous further development of the prototypes has ultimately led to today’s generation of gasinsulated metal-enclosed switchgear. This switchgear is notable in particular for: Economic efficiency
8DN8 switchgear for rated voltages up to 145 kV

High reliability Safe encapsulation High degree of gastightness Long service life Low life cycle and maintenance costs Good accessibility andergonomics High availability Safe operation even under extreme environmental conditions. All requirements nowadays specified for modern and advanced switchgear in terms of performance and reliability are met by our type 8DN8 switchgear for rated voltages of up to 145 kV. This switchgear design represents one of the most compact solutions available in this voltage range. Its space-saving design and itslow weight contribute to making this switchgear extremely economical. Since the levels of noise and field emission (EMC) are extremely low, it is possible to integrate this switchgear even in sensitive environments, residential quarters, and city centers. With these characteristics, our type 8DN8 switchgear meets all requirements for environmentally compatible high-voltage switchgear.

Theoperator panel of the processor bus bay control system is integrated in the operating front of the bay

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8DN8 switchgear for rated voltages up to 72.5 kV

Both plug-in type and conventional cablesealing ends can be used in conjunction with type 8DN8 switchgear

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Flexible due to modular design

A fundamental feature of our gas-insulated switchgear is the high degree of versatilityprovided by its modular system. Depending on their respective functions, the components are housed either individually and/or combined in compressed gastight enclosures. With a remarkably small number of active and passive modules, all customary circuit variants are possible. Sulphur hexafluoride (SF6) is used as the insulating and arc-quenching medium. Three-phase enclosures are used for type 8DN8switchgear in order to achieve extremely low component dimensions. This concept allows a very compact design with reduced space requirement. Aluminum is used for the enclosure. This assures freedom from corrosion and results in low weight of the equipment. The use of modern construction methods and casting techniques allows optimizing the enclosure’s dielectric and mechanical characteristics. The lowbay weight ensures minimal floor loading and eliminates the need for complex foundations.

All the modules are connected to one another by means of flanges. The gastightness of the flange connections is assured by proven O-ring seals. Temperature-related changes in the length of the enclosure and installation tolerances are compensated by bellows-type expansion joints. To that end, theconductors are linked by coupling contacts. Where necessary, the joints are accessible via manway openings. Gastight bushings allow subdivision of the bay into a number of separate gas compartments. Each gas compartment is provided with its own gas monitoring equipment, a rupture diaphragm, and filter material. The static filters in the gas compartments absorb moisture and decomposition products. Therupture diaphragms prevent build-up of an impermissible high pressure in the enclosure. A gas diverter nozzle on the rupture diaphragm ensures that the gas is expelled in a defined direction in the event of bursting, thus ensuring that the operating personnel is not endangered.

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Three-phase enclosure allows compact design

1. Integrated local control cubicle 6 2. Current transformer 1 7 3....