Chapter A General rules of electrical installation design

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H28 © Schneider Electric - all rights reserved H - LV switchgear: functions & selection 4 Circuit-breaker b Short-circuit level at MV terminals of transformer: 250 MVA b Transformer MV/LV: 1,250 kVA 20/0.4 kV b MV fuses: 63 A b Cabling, transformer - LV circuit-breaker: 10 metres single-core cables b LV circuit-breaker: Compact NS 2000 set at 1,800 A (Ir) What is the maximum short-circuit trip current setting and its maximum time delay allowable? The curves of Figure H58 show that discrimination is assured if the short-time delay tripping unit of the CB is set at: b A level y 6 Ir = 10.8 kA b A time-delay setting of step 1 or 2 1,000 200 100 10 0.2 0.1 0.50 0.01 t (s) 1,800 A Ir Schneider Electric - Electrical installation guide 2008 NS 2000 set at 1,800 A 1 4 6 10 kA Fig. H58 : Curves of MV fuses and LV circuit-breaker 8 Minimum pre-arcing curve for 63 A HV fuses (current referred to the secondary side of the transformer) Isc maxi 31.4 kA Step 4 Step 3 Step 2 Step 1 I
2 3 4 Chapter J Protection against voltage surges in LV Contents General J2 1.1 What is a voltage surge? J2 1.2 The four voltage surge types J2 1.3 Main characteristics of voltage surges J4 1.4 Different propagation modes J5 Overvoltage protection devices J6 2.1 Primary protection devices (protection of installations J6 against lightning) 2.2 Secondary protection devices (protection of internal J8 installations against lightning) Protection against voltage surges in LV J 3.1 Surge protective device description J11 3.2 Surge protective device standards J11 3.3 Surge protective device data according to IEC 61643-1 standard J11 3.4 Lightning protection standards J13 3.5 Surge arrester installation standards J13 Choosing a protection device J 4 4.1 Protection devices according to the earthing system J14 4.2 Internal architecture of surge arresters J15 4.3 Installation rules J16 4.4 Selection guide J17 4.5 Choice of disconnector J22 4.6 End-of-life indication of the surge arrester J22 4.7 Application example: supermarket J23 Schneider Electric - Electrical installation guide 2008 J © Schneider Electric - all rights reserved
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2 3 4 5 6 7 8 Chapter D MV & LV arc
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2 3 4 5 Chapter Q EMC guidelines Co
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Chapter A General rules of electrical installation design

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