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OHB Outdoor sulphur Hexafluoride circuit-Breaker

OHB outdoor circuit-breaker. Fields of applicationoutdoor installationscontrol and protection of distribution linescontrol and protection of distribution substationscontrol and protection of transformerscontrol and protection of capacitor banks. OHB outdoor circuit-breaker. Electrical characte

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OHB Outdoor sulphur Hexafluoride circuit-Breaker

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    1. OHB Outdoor sulphur Hexafluoride circuit-Breaker 1-2002

    2. OHB outdoor circuit-breaker Fields of application outdoor installations control and protection of distribution lines control and protection of distribution substations control and protection of transformers control and protection of capacitor banks

    3. OHB outdoor circuit-breaker Electrical characteristics Rated voltage 24 36 kV Withstand voltage (1 min.) 70 (60) 95 (80) kV dry (wet) Impulse withstand voltage 150 200 kV Rated normal current at 40°C 1250 / 2500 A Rated frequency 50 / 60 Hz Rated breaking capacity 25 / 31.5 kA Making capacity 63 / 80 kA Operating temperature -30 . . . . + 40 °C

    4. OHB outdoor circuit-breaker Standards IEC 60056 (tested in compliance with the prescriptions of Amendment 3, table XII, list 1 in order to ensure suitability for overhead lines with rapid re-closing cycle) IEC 60694

    5. OHB outdoor circuit-breaker Development, production, quality control according to : ISO 14001 STDs as for Environmental Management System ISO 9001 STDs as for Quality Assurance System

    6. OHB outdoor circuit-breaker Features Three Phase Circuit Breaker The same arcing chamber of HD4 MV indoor c.b. series HD4 arcing chamber housed in a hollow porcelain cylinder Ceramic insulators assembled by means of flanges with terminals Pole cap, flanges, sump in anodized alluminium alloy Pole ”sealed for life” pressure system Pole cover with safety valve Terminal for connection as NEMA 4 form

    7. OHB outdoor circuit-breaker Features ESH spring charged operating mechanism (the same actuator of the whole the HD4 series) Mechanical anti-pumping device to prevent re-closing due to both electrical and mechanical controls Complete range of accessories Wide range of power supply voltages of the electrical accessories Two-levels pressure-switch Cabinet housing all the actuator, the control devices, the operating shafts and lever, the transmission, the poles linkage

    8. OHB outdoor circuit-breaker Features Cabinet supporting the three pole assemblies Cabinet and cabinet supporting structure made of hot galvanised steel sheet Weather proof cabinet Tight door with window for status c.b. inspection without opening the cabinet door Case door handle suitable for three padlocks Anti-condensation heater and heating elements for low temperature

    9. OHB outdoor circuit-breaker Features CT brackets (on request) ”Closed”, ”Open”, ”Spring charged/discharged”, ”SF6 low pressure” signalling lamps (on request) Particularly sturdy construction Simple structure requiring minimal preparation of the site Mounting arrangements Cabinet supported by telescopic supports with adjustable height from 2916 up to 3676 mm (structure in compliance with the prescription of BS 7354 STDs) Cabinet at ground level

    10. OHB outdoor circuit-breaker SF6 interrupter ”Autopuffer” technique based on compression and self-blast technique Low operating energy thanks to the ”autopuffer” technique Minimal maintenance Life in excess of 10,000 mechanical operations Separation between main and arcing contacts ensuring no wear of the main contacts Life in excess of 10,000 electrical operations at rated current

    11. OHB outdoor circuit-breaker SF6 interrupter Low filling pressure respect to a pure puffer technique Arcing-chamber common to HD4 series (tested arcing-chamber) Pole assembly / ceramic insulators similar to the previous SFE series (tested solution) Monitoring of the quenching media ”SF6” thanks to the pressure switch

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    13. OHB outdoor circuit-breaker Breaking technique M.V. quenching technique based on proven advantages of SF6 ”auto-puffer” H.V. circuit-breaker well-known, tested and used in the major industrialized countries State-of-the-art SF6 breaking technology

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