Insulated - Siemens

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Fixed-Mounted Circuit-Breaker Switchgear Type NXPLUS up to 40.5 kV, SF6-Insulated Standards Standards, specifications, guidelines Standards The NXPLUS switchgear complies with the relevant standards and specifications applicable at the time of type tests. In accordance with the harmonization agreement reached by the EU countries, their national specifications conform to the IEC standard. Overview of standards (December 2002) IEC standard VDE standard EN standard up to now current in future current in future current Switchgear IEC 60 694 * IEC 60 694 * IEC 62 271-1 VDE 0670 Part 1000 VDE 0671-001 EN 60 694 IEC 60 298 * IEC 60 298 * IEC 62 271-200 VDE 0670 Part 6 VDE 0671-200 EN 60 298 Devices 1 ) IEC 60 056 ** IEC 62 271-100 IEC 62 271-100 VDE 0670 P. 101 to 106 VDE 0671-100 EN 60 056 2 ) IEC 60 129 ** IEC 62 271-102 IEC 62 271-102 VDE 0670 Part 2 VDE 0671-102 EN 60 129 3 ) IEC 61 243-5 IEC 61 243-5 IEC 61 243-5 VDE 0682 Part 415 VDE 0682 Part 415 EN 61 243-5 Degree of IEC 60 529 IEC 60 529 IEC 60 529 VDE 0470 Part 1 VDE 0470 Part 1 EN 60 529 protection Insulation IEC 60 071 IEC 60 071 IEC 60 071 VDE 0111 VDE 0111 EN 60 071 Current IEC 60 044-1 IEC 60 044-1 IEC 60 044-1 VDE 0414 Part 1 VDE 0414 Part 1 EN 60 044-1 transformers * In future, all standards for switching devices and switchgear will be Voltage summarized in IEC 62 271 transformers IEC 60 044-2 IEC 60 044-2 IEC 60 044-2 VDE 0414 Part 2 VDE 0414 Part 2 EN 60 044-2 ** Withdrawn standard 1) Circuit-breaker 2) Disconnector and earthing switch 3) Voltage detection systems Type of service location NXPLUS switchgear can be used as an indoor installation in accordance with IEC 61 936 / VDE 0101: • Outside lockable electrical service locations at places which are not accessible to the public. Enclosures of switchgear can only be removed with tools. • Inside lockable electrical service locations. A lockable electrical service location is a place outdoors or indoors that is reserved exclusively for housing electrical equipment and which is kept under lock and key. Access is restricted to authorized personnel and persons who have been properly instructed in electrical engineering. Untrained or unskilled persons may only enter under the supervision of authorized personnel or properly instructed persons. Insulating capacity The insulating capacity is verified by testing the switchgear with rated values of shortduration power-frequency withstand voltage and lightning impulse withstand voltage according to IEC 60 094 / VDE 0670 Part 1000 (see following table): Table – Insulating capacity Rated voltage (r.m.s. value) kV All parts subjected to high voltage within the switchgear are insulated against the earthed outside enclosure. This insulation permits installation of the switchgear at any altitude above sea level without detrimental influences on the dielectric strength. This also applies to cable connection. 7.2 12 15 17.5 24 36 40.5 Rated short-duration power-frequency withstand voltage (r.m.s. value) – Across isolating distances kV 23 32 40 45 60 80 90 – Between phases and to earth kV 20 28 36 38 50 70 85 Rated lightning impulse withstand voltage (peak value) – Across isolating distances kV 70 85 105 110 145 195 218 – Between phases and to earth kV 60 75 95 95 125 170 185 24 Siemens HA 35.51 · 2003
Fixed-Mounted Circuit-Breaker Switchgear Type NXPLUS up to 40.5 kV, SF6-Insulated Standards Standards, specifications, guidelines Current-carrying capacity • According to IEC 60 298 / VDE 0670 Part 6 or IEC 60 694 / VDE 0670 Part 1000, the rated normal current refers to the following ambient temperatures: – Maximum value of 24-h mean + 35 °C – Maximum value + 40 °C • The current-carrying capacity of the panels and busbars depends on the ambient temperature outside the enclosure. Tests for resistance to internal arc faults • Tests for verifying resistance to internal arc faults should establish proper protection for operating personnel • Tests for resistance to internal arc faults can be agreed between the owner and manufacturer in accordance with IEC 60 298 / VDE 0670 Part 6 • All criteria of the above standards are met Resistance to internal arc faults Due to the single-pole enclosure of external components and the SF 6 -insulation of switching devices, the probability of faults in NXPLUS fixed-mounted circuit-breaker switchgear is considerably lower than in former switchgear types, as • There are no effects due to external influences such as – Pollution layers – Moisture – Small animals and foreign bodies • Maloperation is practically excluded by logical arrangement of the operating mechanism elements • The three-position disconnector and the vacuum circuit-breaker provide short-circuit-proof earthing of the feeder Should arcing occur in spite of this, the pressure is relieved towards the rear into a duct. In the unlikely event of a fault inside the module vessel, the energy conversion in the case of an internal arc fault is minor thanks to the SF 6 -insulation, i.e.approximately only ½3 compared to air. The pressure relief in the rear wall of the module vessel operates in the range of 2 to 3.5 bar. The escaping gases are discharged to the rear into a duct. The pressure relief duct diverts the gases upwards. Aseismic capacity (optional) NXPLUS switchgear can be upgraded for regions at risk from earthquakes. For upgrading, earthquake qualification testing has been carried out in accordance with the following standards: • IEC 68-3-3, 1993 • IEC 68-2-6, 1995 • IABG TA13-TM-002/98 (guide) Within the range of the prevailing earthquake frequencies from1Hzto35Hz,the category 1 required response spectrum according to IABG TA13-TM-002/98 covers the following response spectra: • Uniform Building Code zone 3 • Seismic Requirements Spec. 9067; Department of Water & Power, Los Angeles • GTS – 1.013 ENDESA, Chile • VDE 0670 Part 111 Siemens HA 35.51 · 2003 25
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