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Clearences

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Clearences

Clearences

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  • 1. Electrical Clearance in Substation APRIL 6, 2011 23 COMMENTS Minimum Clearance in Substation: Volta ge High est Volta ge Lighti ng Impul se Level (Kvp) Switchi ng Impuls e Level (Kvp) Minimum Clearance Safety Clearance( Mt) Ground Clearance( Mt) Phas e- Eart h Phas e- Phas e 11KV 12KV 70 0.17 8 0.22 9 2.600 3.700 33KV 36KV 170 0.32 0 0.32 0 2.800 3.700 132K V 145K V 550 1.10 0 1.10 0 3.700 4.600 650 1.10 0 1.10 0 2.700 4.600 220K V 245K V 950 1.90 0 1.90 0 4.300 5.500 1050 1.90 0 1.90 0 4.300 5.500 400K V 420K V 1425 1050(P -E) 3.40 0 4.20 0 6.400 8.000 Electrical Clearance in Substation: Voltage Height of I Bay From Groun d (Mt) Height of II Bay From Groun d (Mt) Bay Widt h (Mt) Phase - Phase (Mt) BetweenEquipme nt Earth Wire From Groun d 132KV (Single) 8.0 - 11.0 3.0 3.0 10.5
  • 2. 220KV (Single) 12.5 - 18 4.5 4.5 15.5 220KV (Double ) 18.5 25 25 4.5 4.5 28.5 400KV 15.6 22 22.0 7.0 >6.0 30.0 Standard Bay Widths in Meters: Voltage Bay Width (Meter) 11KV 4.7 Meter 33KV 4.7 Meter 66KV 7.6 Meter 132KV 12.2 Meter 220KV 17 Meter 400KV 27 Meter Standard Bus and Equipment Elevation Voltage Equipment live Terminal Elevation (Meter) Main Bus Take of Elevation (Meter)Low High 11 KV/33KV 2.8To 4 5.5 To6.5 9 6.5To8.5 66KV 2.8To 4 6To8 9To 10.5 9.5 132KV 3.7To5 8To9.5 13.5To14.5 12To12.5 220KV 4.9To5.5 9To13 18.5 15To18.5 400KV 8.0 15.5 - 23
  • 3. Phase spacing for strung Bus: Voltage Clearance 11KV 1300 mm 33KV 1300 mm 66KV 2200 mm 132KV 3000 mm 220KV 4500 mm 400KV 7000 mm Minimum Clearance of Live Parts from Ground: Voltage Minimum Clearance to Ground (Mt) Section Clearance (Mt) 11KV 3.700 2.600 33KV 3.700 2.800 66KV 4.600 3.000 132KV 4.600 3.500 220KV 5.500 4.300 400KV 8.000 7.000 Insulator String: Voltage No of Suspension String Length (mm) No of Disc for Tension String Length in (mm) 66KV 5 965 6 1070 132KV 9 1255 10 1820 220KV 14 1915 15 2915 400KV 23 3850 2 X 23 5450
  • 4. Nominal Span: Voltage Normal Span (Meter) 66KV 240-250-275 132KV 315-325-335 220KV 315-325-335 400KV 315-325-335 Minimum Ground Clearance: Voltage Ground (Meter) 66KV 5.5 132KV 6.1 220KV 7.0 400KV 8.0 800KV 12.4 Indoor Substation Minimum Clearances Distance Descriptions 0.9 Meter Horizontally between any item of equipment and thesubstation wall 0.6 Meter Horizontally between any Two items of equipment 1.2 Meter Horizontally in front of any HV switchgear
  • 5. Clearance of Conductor on Tower Voltage Tower Type Vertical Space (Mt) Horizontal Space(Mt) Total Height From Ground(Mt) 66KV A 1.03 4.0 15.91 B 1.03 4.27 15.42 C 1.22 4.88 16.24 132KV A 7.140 2.17 23.14 B 4.2 6.29 22.06 C 4.2 7.15 22.68 D 4.2 8.8 24.06 220KV A 5.2 8.5 28.55 B 5.25 10.5 29.08 C 6.7 12.6 31.68 D NORMS OF PROTECTION FOR EHV CLASS POWER TRANSFORMERS Voltage ratio & capacity HV Side LV Side Common relays 132/33/11KV up to 8 MVA 3 O/L relays + 1 E/L relay 2 O/L relays + 1 E/L relay Buchholz, OLTC Buchholz, OT, WT 132/33/11KV above 8 MVA and below 31.5 MVA 3 O/L relays + 1 dir. E/L relay 3 O/L relays + 1 E/L relay Differential, Buchholz, OLTCBuchholz, OT, WT 132/33KV, 31.5 MVA & above 3 O/L relays + 1 dir. E/L relay 3 O/L relays + 1 E/L relay Differential, Over flux,Buchholz, OLTC PRV, OT, WT 220/33 KV, 3 O/L relays + 3 O/L relays + Differential, Over
  • 6. 31.5MVA & 50MVA 220/132KV, 100 MVA 1 dir. E/L relay 1 dir. relay flux,Buchholz, OLTC PRV, OT, WT 400/220KV 315MVA 3 directional O/L relays (with dir. High set) +1 directional E/L relays. Restricted E/F relay + 3 Directional O/L relays for action 3 directional O/L relays (with dir. High set)+1 directional E/L relays. Restricted E/F relay Differential, Over flux,Buchholz, OLTC PRV, OT, WT and overload (alarm) relay The bottom most portion of any insulator or bushing in service should be at a minimum height of 2500 mm above ground level. Location of L.A (From T.C Bushing): Voltage BIL KV Peak Distance (Mt) 11KV 75 12 33KV 200 15 66KV 325 24 132KV 550 35 220KV 900 To 1050 Close To T.C 400KV 1425 To 1550 About these ads

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