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25 Years Gas-Insulated Medium-Voltage Switchgear from Siemens Medium-Voltage Switchgear - Then and Now - Hans-Joachim Müller
Power Transmission and Distribution © Siemens AG 2006 Page 2 June 07 Medium Voltage Division Evolution of Medium-Voltage Switchgear non type tested Air-insulated type tested Gas-insulated Air/solid-insulated Cast-resin insulated Source: ABB Local installation Workshop manufacture Factory- assembled, type-tested Factory- assembled, compact Factory- assembled, SF 6 -insulated Yearuntil 1950 until 1970since 1970since 1980since 1982 Building83 m 3 47 m 3 29 m 3 24 m 3 8 m 3 Panel19 m m m m m 3
Power Transmission and Distribution © Siemens AG 2006 Page 3 June 07 Medium Voltage Division Situation in the Past Yesterday, switchgear were air, oil or cast-resin insulated with the following features: Huge dimensions Dependent on pollution and climate Maintenance at regular intervals Human failure during maintenance High fire risk Not arc-fault tested This means: High investment for buildings High costs for maintenance staff and system transfer in the network Breakdown of the network (longer downtimes)
Power Transmission and Distribution © Siemens AG 2006 Page 4 June 07 Medium Voltage Division Restricted Availability and Reliability of Supply After short circuit at the rear side of an epoxy-resin insulated switchgear Burned-out 10 kV substation: Fire after short circuit in an epoxy-resin insulated ring-main unit
Power Transmission and Distribution © Siemens AG 2006 Page 5 June 07 Medium Voltage Division Requirements for development: Personal safety Reliability of supply Maintenance-free design Suitability for all switching duties Sufficient power reserves Low fire risk Small, light design Concept options for new switchgear due to availability of the following equipment: Maintenance-free switching devices Shockproof cable plugs and bar connections Electronic measuring and protection devices Objectives for the Development of New Switchgear
Power Transmission and Distribution © Siemens AG 2006 Page 6 June 07 Medium Voltage Division Constructional implementation: Solid insulation is replaced by insulating gas with constant properties Sealed enclosure of primary part Installation of fixed-mounted, maintenance-free switching devices: - Vacuum circuit-breaker - Three-position switch - SF 6 -switch-disconnector Shockproof cable plugs Use of current and voltage transformers with low susceptibility to faults Verification of safe isolation from supply with capacitive voltage dividers Maintenance-free and reliable operating elements with few parts inside the enclosure Easiest operation Pressure-resistant enclosure with defined pressure relief Implementation of the Development Tasks
Power Transmission and Distribution © Siemens AG 2006 Page 7 June 07 Medium Voltage Division Situation with Gas-Insulated Switchgear Todays state of the art is gas-insulated switchgear with the following main benefits: Small, compact dimensions Independent of environmental effects and climate Widely maintenance-free Maximum safety for staff Low fire risk Arc-fault tested Advantages: Low invest for buildings due to compact dimensions and climate-independent design Maximized power supply reliability Maximum personal safety Lowest life cycle costs Reduced operational costs - no additional maintenance costs
Power Transmission and Distribution © Siemens AG 2006 Page 8 June 07 Medium Voltage Division First SIEMENS Gas-Insulated Medium-Voltage Switchgear (April 1982) Kulmbach / Germany 8DA10 16 panels 24 kV / 16 kA (3s) / 1250 A
Power Transmission and Distribution © Siemens AG 2006 Page 9 June 07 Medium Voltage Division Applications Today Tibet / China 8DA panels 40.5 kV / 31.5 kA (3s) / 1250 A Site altitude: 3000 – 5000 m
Power Transmission and Distribution © Siemens AG 2006 Page 10 June 07 Medium Voltage Division First SIEMENS Gas-Insulated Medium-Voltage Ring-Main Unit (April 1982) Stadtwerke Lambrecht / Pfalz, Germany Project:Municipal power supply Electrical data:24 kV, 16 kA, 630 A Typicals:8DJ10, scheme 10
Power Transmission and Distribution © Siemens AG 2006 Page 11 June 07 Medium Voltage Division Switchgear Type 8DJ Typical Application Examples
25 Years Gas-Insulated Medium-Voltage Switchgear from Siemens Thank you very much for your attention!
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