What are the features of Siemens 8DJH switchgear?

the features of Siemens 8DJH:
Environmental independence

Hermetically tight, welded switchgear vessels made of

stainless steel as well as single-pole solid insulation make   the parts of the primary circuit under high voltage of 8DJH switchgear

• Insensitive to certain aggressive ambient conditions,such as:

– Saline air

– Air humidity

– Dust

– Condensation

• Tightto ingress of foreign objects, such as:

– Dust

– Pollution

– Small animals

– Humidity.

Compact design

Thanks to the use of SF6  insulation, compact dimensions are possible. Thus:

• Existing switchgearrooms and substation rooms can be used effectively
• New constructions costlittle
• Costly city-area spaceis saved.

Maintenance-free design

Switchgear vessels designed as sealed pressure systems, maintenance-free switching devices and enclosed cable  plugs ensure:

• Maximum supplyreliability
• Personnelsafety
• Sealed-for-lifedesign according to IEC 62271-200 (sealed pressure system)
• Installation, operation, extension andreplacement without SF6 gas work
• Reducedoperating costs
• Cost-efficient investment
• Nomaintenance cycles.

Innovation

The use of digital secondary systems and combined protec- tion and control devices ensures:

• Clear integration inprocess control systems
• Flexible andhighly simplified adaptation to new system conditions and thus cost-efficient operation.

Service life

Under normal operating conditions, the expected service life   of gas-insulated switchgear 8DJH is at least 35 years, probably 40 to 50 years, taking the tightness of the hermetically weld-   ed switchgear vessel into account. The service life is limited by the maximum number of operating cycles of the switchgear    devices installed:

• For circuit-breakers, according to the endurance classdefined in IEC 62271-100
• Forthree-position disconnectors and earthing switches,

according to the endurance class defined in IEC 62271-102

• Forthree-position switch-disconnectors and earthing switches, according to the endurance class defined in IEC 62271-103.