The Siemens 8DJH is extremely secure for the following reasons:
Personal safety
- Safe-to-touch andhermetically sealed primary enclosure
- Standarddegree of protection IP 65 for all high-voltage parts of the primary circuit, at least IP 2X for the switch- gear enclosure according to IEC 60529 and VDE 0470-1
- Cableterminations, busbars and voltage transformers are surrounded by earthed layers. All high-voltage parts including the cable terminations, busbars and voltage transformers are metal-enclosed
- Operatingmechanisms and auxiliary switches safely accessible outside the primary enclosure (switchgear vessel)
- Highresistance to internal arcs by logical mechanical interlocks and tested switchgear enclosure
- Panelstested for resistance to internal faults up to 21 kA
- Capacitive voltage detecting system to verify safeisolation from supply
- Dueto the system design, operation is only possible with closed switchgear enclosure
- Logicalmechanical interlocks prevent maloperation
- HVHRC fuses and cable sealingends are only accessible when outgoing feeders are earthed
- Feederearthing via make-proof earthing switches.
Security of operation
- Hermetically sealedprimary enclosure independent of environmental effects (pollution, humidity and small animals)
- Weldedswitchgear vessels, sealed for life
- Maintenance-free in an indoorenvironment (IEC 62271-1 and VDE 0671-1)
- Operatingmechanisms of switching devices accessible outside the primary enclosure (switchgear vessel)
- Metal-coated, plug-in inductive voltage transformersmounted outside the SF6 switchgear vessel
- Current transformers asring-core current transformers mounted outside the SF6 switchgear vessel
- Complete switchgear interlocking system withlogical mechanical interlocks
- Mechanicalposition indicators integrated in the mimic diagram
- Minimumfi re load
- Option:Resistance against earthquakes.
Reliability
- Typeand routine-tested
- Standardized andmanufactured using numerically controlled machines
- Quality assurancein accordance with DIN EN ISO 9001
- Morethan 500,000 switchgear panels of Siemens in operation worldwide for many years.
