HD4 - 68 Pages

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Catalogue excerpts

Medium voltage products

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ELECTRICAL CIRCUIT DIAGRAM

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1 DescriPtion Autopuffer breaking technique Electric arc extinction without chopped current No restriking after breaking Rapid recovery of the dielectric properties of the means of extinction Withstand insulation voltage even at zero relative pressure (*) Breaking up to 30% of the rated breaking capacity even at zero relative pressure (*) Sealed-for-life poles Test for checking gas tightness carried out three times on each piece of apparatus Compact dimensions General information HD4 medium voltage circuit-breakers use sulphur hexafluoride gas (SF6) to extinguish the electric arc and as the insulating...

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1 3 7 4 6 5 Circuit-breaker closed 1 Main contact separation Arcing contact separation Circuit-breaker open Main contact separation No electric arc strikes as the current flows through the arcing contacts. During its run downwards, the moving part compresses the gas contained in the lower chamber. The compressed gas flows out of the lower chamber into the upper chamber, taking them both to the same pressure. 8 Arcing contact separation The current flows thanks to the electric arc which has struck between the arcing contacts. The gas cannot get out through the nozzle because the hole is still closed...

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1 DescriPtion Standards and approvals HD4 circuit-breakers comply with IEC 62271-100, CEI 17-1 file 1375 Standards and with those of major industrialised countries. They have undergone the following tests and guarantee safety and reliability of the apparatus in service in all installations. • Type tests: heating, withstand insulation at industrial and impulse frequency, short-time and peak withstand current, mechanical duration, making and breaking of short-circuit currents; • Individual tests: insulation with voltage at industrial frequency in the main circuits and insulation of the auxiliary...

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Accessories Technical documentation HD4 circuit-breakers have a complete range of accessories which fulfil all installation requirements. The operating mechanism is the same type for the whole series and has a standardized range of accessories and spare parts which are easy to identify and order. Apparatus use, maintenance and service have been simplified and require less use of resources. To obtain in-depth knowledge of technical and application aspects of the HD4 circuitbreakers please ask for the following publications: ESH operating mechanism • Just one device for the whole series. • The same...

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2 Circuit-breaker selection and ordering General characteristics of fixed circuit-breakers (36 kV) Circuit-breaker Standards IEC 62271-100 CEI 17-1 (file 1375) Rated voltage Ur [kV] Rated insulation voltage Us [kV] Withstand voltage at 50 Hz Ud (1 min) [kV] Impulse withstand voltage Up [kV] Rated frequency fr [Hz Rated normal current (40 °C) (1) Ir [A] Rated breaking capacity Isc [kA] Fixed HD4 36 kV circuit-breaker with 350 mm pole centre distance: Ir = 630-1250-1600 A; Isc = 16-20 kA. Rated short-time Ik [kA] withstand current (3 s) Making capacity Ip [kA] Operation sequence [O-0.3s-CO-15s-CO]...

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2 Circuit-breaker selection and ordering General characteristics of withdrawable circuit-breakers for CBE enclosures and CBF fixed parts (12 - 17.5 - 24 kV) HD4/C 12 Circuit-breaker Standards IEC 62271-100 CEI 17-1 (file 1375) Rated voltage Ur [kV] 12 Rated insulation voltage Us [kV] 12 Withstand voltage at 50 Hz Ud (1 min) [kV] 28 Impulse withstand voltage Up [kV] 75 Rated frequency fr [Hz 50-60 Rated normal current (40 °C) (1) Ir [A] 630 1250 1250 1600 2000 2500 3150 (3) 16 16 — — — — — — — — — — — — 25 25 — 25 25 25 — 31.5 31.5 — 31.5 31.5 31.5 31.5 — — 40 40 40 40 40 — — 50 50 50 50 50 16...

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2 Circuit-breaker selection and ordering General characteristics of withdrawable circuit-breakers for UniGear type ZS1 switchgear (12 - 17.5 - 24 kV) (4) HD4/P 12 Circuit-breaker Standards IEC 62271-100 CEI 17-1 (file 1375) Rated voltage Ur [kV] 12 Rated insulation voltage Us [kV] 12 Withstand voltage at 50 Hz Ud (1 min) [kV] 28 Impulse withstand voltage Up [kV] 75 Rated frequency fr [Hz 50-60 Rated normal current (40 °C) (1) Ir [A] 630 1250 1250 1600 2000 2500 3150 (3) 16 16 — — — — — — — — — — — — 25 25 — 25 25 25 25 31.5 31.5 — 31.5 31.5 31.5 31.5 — — 40 40 40 40 40 — — — 50 50 50 50 16 16...

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2 Circuit-breaker selection and ordering General characteristics of withdrawable circuit-breakers for UniGear type ZS3.2 switchgear (40.5 kV) Circuit-breaker Standards IEC 62271-100 CEI 17-1 (file 1375) (3) Rated voltage Ur [kV] Rated insulation voltage Us [kV] Withstand voltage at 50 Hz Ud (1 min) [kV] Impulse withstand voltage Up [kV] Rated frequency fr [Hz Rated normal current (40 °C) (1) Ir [A] Rated breaking capacity Isc [kA] Rated short-time Ik [kA] withstand current (3 s) Making capacity Ip [kA] Operation sequence [O-0.3s-CO-15s-CO] Opening time [ms] Arcing time [ms] Total breaking time...

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(1) Rated normal current with circuit-breaker in switchgear UniGear ZS3.2 and ambient temperature outside the switchgear 40 °C (2) Rated service value (3) The circuit-breaker also conforms to the following Chinese - DL/T402-1999 National Power Company Standard - JB/T9694-1999 Machinery/Electricity Ministry Standards (4) Rated current in ZS3.2 switchgear with forced ventilation; in Powerbloc enclosure the 2500 A rated current is guaranteed with natural ventilation. (5) The operation sequence becomes O-0.3-CO-3min-CO for the

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2 Circuit-breaker selection and ordering General characteristics of withdrawable circuit-breakers for PowerCube units (36 kV) and UniGear type ZS2 switchgear (36 kV) Circuit-breaker Standards IEC 62271-100 CEI 17-1 (file 1375) Rated voltage Ur [kV] Rated insulation voltage Us [kV] Withstand voltage at 50 Hz Ud (1 min) [kV] Impulse withstand voltage Up [kV] Rated frequency fr [Hz Rated normal current (40 °C) (1) Ir [A] Rated breaking capacity Isc [kA] Rated short-time Ik [kA] withstand current (3 s) Making capacity Ip [kA] Operation sequence [O-0.3s-CO-3min-CO] [O-0.3s-CO-15s-CO] Opening time [ms]...

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