Sub Station Abstract -( Part-3)
SUB STATION ABSTRACT- (PART-3)
ELECTRICAL WIRE GROUND CLEARANCE:
-
GROUND CLEARANCE IN METER = 5.812 + 0.305 X K
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Where K= (Volt-33) / 33
Voltage Level Ground Clearance <=33KV 5.2 Meter 66KV 5.49 Meter 132KV 6.10 Meter 220KV 7.0 Meter 400KV 8.84 Meter
OVERHEAD CONDUCTOR /CABLE SIZE:
Voltage
Overhead Conductor
Cable Size
33 KV ACSR-Panther/Wolf/Dog , AAAC 150,185,300,400,240 mm2 Cable 11 KV ACSR-Dog/Recon/Rabbit , AAAC 120, 150,185,300 mm2 Cable LT ACSR-Dog/Recon/Rabbit , AAC,AAAC 95,120, 150,185,300 mm2 Cable
TRANSMISSION / DISTRIBUTION LINE:
Span
Height of Tower
400KV=400 Meter
400KV=30Meter (Base 8.8 Meter)
220KV=350 Meter
220KV=23Meter (Base 5.2 Meter)
132KV=335 Meter
220KV Double Circuit=28 Meter
66KV=210 Meter
66KV=13Meter
Conductor Ampere
Voltage wise Conductor
Dog=300Amp
400KV=Moose ACSR=500MVA Load
Panther=514Amp
220KV=Zebra ACSR=200MVA Load
Zebra=720Amp
132KV=Panther ACSR=75MVA Load
Rabbit=208Amp
66KV=Dog ACSR=50MVA Load
Moose=218Amp
TYPE OF TOWER:
Type
Used
Angle/Deviation
A
Suspension Tower Up to 2°
B
Small Angle Tower 2° to 15°
C
Medium Angle Tower 15° to 30°
D
Large Angle / Dead End Tower 30° to 60° & Dead End
TOWER SWING ANGLE CLEARANCE (METAL PART TO LIVE PART):
Swing Angle
Live Part to Metal Part Clearance (mm)
66KV
132KV
220KV
400KV
0°
915mm
1530mm
2130mm
3050mm
15°
915mm
1530mm
2130mm
–
22°
–
–
–
3050mm
30°
760mm
1370mm
1830mm
–
44°
–
–
–
1860mm
44°
610mm
1220mm
1675mm
–
CORONA RING SIZE:
Voltage
Size
<170 KV 160mm Ring put at HV end >170 KV 350mm Ring put at HV end >275 KV 450mm Ring put at HV end & 350 mm Ring put at Earth end
SPAN OF TRANSMISSION LINE (CENTRAL ELECTRICITY AUTHORITY):
Voltage
Normal Span
765 KV
400 to 450 Meter
400 KV
400 Meter
220 KV
335,350,375 Meter
132 KV
315,325,335 Meter
66 KV
240,250,275 Meter