Insulated - Siemens

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Fixed-Mounted Circuit-Breaker Switchgear Type NXPLUS up to 40.5 kV, SF6-Insulated Application Requirements Typical uses Fixed-mounted circuit-breaker switchgear NXPLUS is used in transformer and switching substations, e. g. in: ■ Power supply companies ■ Power stations ■ Cement industry ■ Automobile industry ■ Iron and steelworks ■ Rolling mills ■ Mining industry ■ Textile, paper and food industries ■ Chemical industry ■ Petroleum industry ■ Pipeline installations ■ Offshore installations ■ Electrochemical plants ■ Petrochemical plants ■ Shipbuilding industry ■ Diesel power plants ■ Emergency power supply installations ■ Lignite open-cast mines ■ Traction power supply systems Features Environmental independence Welded switchgear vessels made of stainless steel without seals and enclosed cable plugs make NXPLUS switchgear • Insensitive to aggressive ambient conditions such as salt water, humidity, dust and temperature • Hermetically tight to ingress of foreign bodies such as dust and dirt • Independent of site altitude Compact design Thanks to the SF 6 -insulation, compact dimensions are possible up to 40.5 kV. Thus, • Existing switchgear rooms can be used effectively • Reduced costs for new constructions • Expensive city-area space is saved Maintenance-free design Switchgear vessels designed as sealed pressure systems, maintenance-free switching devices and enclosed cable plugs ensure • Maximized power supply reliability • Personal safety • Sealed-for-life design according to IEC 60 298 • Installation, operation, extension and replacement without SF 6 -gas work • Reduced operating costs • Cost-efficient investment • No maintenance cycles • Reduced overall LCC (Life-Cycle Cost) Innovations The use of numerical substation control and protection systems and combined protection and control devices ensure • Clear integration in process control systems • Flexible and highly simplified adaptation to new system conditions and thus to cost-efficient operation 4 Siemens HA 35.51 · 2003
Fixed-Mounted Circuit-Breaker Switchgear Type NXPLUS up to 40.5 kV, SF6-Insulated Requirements Safety Technology Personal safety • Safe-to-touch and hermetically sealed primary enclosure • All high-voltage parts including the cable terminations, busbars and voltage transformers are surrounded by earthed layers or metal enclosures • Capacitive voltage detection system for verification of safe isolation from supply • Operating mechanisms and auxiliary switches safely accessible outside the primary enclosure (switchgear vessel) • Protective system interlock to prevent operation when the switchgear enclosure is open • Standard degree of protection IP 65 (primary part) and IP 3XD (secondary part) according to IEC 60 529 / VDE 0470 Part 1 • High resistance to internal arcs by logical mechanical interlocks and tested switchgear enclosure • Arc-fault-tested panels according to IEC 60 298 / VDE 0670 Part 6 • Logical mechanical and / or electrical interlocks prevent maloperation Operating safety • Hermetically sealed primary enclosure independent of environmental effects (dirt, moisture and small animals) • Maintenance-free in an indoor environment (IEC 60 694 / VDE 0670 Part 1000) • Operating mechanisms of switching devices accessible outside the switchgear vessel (primary enclosure) • Metal-enclosed, plug-in inductive voltage transformers mounted outside the gas compartments • Ring-core current transformers mounted outside the gas compartments • Complete logical mechanical interlocking system • Welded switchgear vessels, sealed for life • Minimum fire load • Type and routine-tested • Standardized, NC production processes • Quality assurance in accordance with DIN EN ISO 9001 • More than 300,000 switchgear panels of Siemens in operation worldwide for many years • Successfully tested for use down to –20 °C • Option: Aseismic design General • Three-pole enclosure of the primary part consisting of a switchgear vessel made of stainless steel • Insulating gas SF 6 • Three-position switch as busbar disconnector and feeder earthing switch • Make-proof earthing by means of the vacuum circuitbreaker • Outgoing and incoming feeder panel width: 600 mm • Hermetically welded switchgear vessel made of stainless steel without seals • Single-pole, solid-insulated, screened, bolted-type module coupling • Cable connection with inside or outside cone plug-in systems or connection of solid-insulated bars • Wall-standing or freestanding arrangement • Cable connection access from front or rear • Doors left or right-hinged • Existing switchgear extendable on both sides without modification of panels • Internal panel control cables laid in metallic cable ducts Modular design • Circuit-breaker module replacement possible without SF 6 -gas work and without interrupting busbar operation • Low-voltage compartment can be removed without interrupting the bus wires Instrument transformers • Can be removed without altering the positions of the busbar and circuit-breaker modules (outside the gas compartments) Vacuum circuit-breaker • Maintenance-free under normal ambient conditions according to IEC 60694 / VDE 0670 Part 1000 • No relubrication or readjustment • Up to 10,000 operating cycles • Vacuum-tight for life Interlocks • According to IEC 60 298 / VDE 0670 Part 6 • Electrical interlocks since all mechanisms are motor operating mechanisms • Manual emergency operating mechanisms with enabling key S1 Siemens HA 35.51 · 2003 5
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Insulated - Siemens

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