Disc Insulators

Standard Particulars     Product No. 50/51* 52/53 Porcelain Diameter, mm 255 255 Spacing, mm 145 145 Creepage Distance, mm 320 320 Combined Electrical & Mechanical Strength 45    kN 4589 Kgf. 70   kN 7138 Kgf.   Flashover  Voltage Power Frequency Dry kVRms 75 75 Wet kVRms 45 45 Impulse Positive,kVp 115 115 Negative, kVp 120 120   Withstand  Voltage Power Frequency Dry  kVRms 70 70 Wet  kVRms 40 40 Impulse Positive,kVp 110 110 Negative,kVp 115 115 Power Frequency Puncture Voltage, kVRms, 110 110 Visible Discharge Voltage, kV Rms 9 9

* Drawing No. 50, 52 pertains to Ball and Socket type and drawing no. 51, 53 pertains to Tongue and Clevis type.

Standard Specifications :  IS 731, BS 137 & IEC 383

Pin Insulators

Standard Particulars Product No. 24-23  29  26R-1 27R 28R     Highest System Voltage, kV 12 12 24 36 36 Creepage Distance, mm 230 320 430 580 700 Cantilever strength, KN 5 10 10 10 10   Flashover Voltage Power Frequency Dry kV Rms 65 75 100 110 130 Wet kVRms 38 45 60 85 95 Impulse Positive, kVp 105 110 160 205 210 Negative, kVp 110 120 205 225 250   Withstand Voltage Power Frequency Dry, kVRms 60 70 90 100 110 Wet, kVRms 35 40 55 80 90 Impulse Positive, kVp 95 100 140 180 200 Negative, kVp 105 110 150 190 220 Power Frequency Puncture Voltage, Kv, * 105 110 140 180 210  Thimble Type, IS 2486 Pt II/BS 3286 Pt II Small Small  Large Large Large

* As per standard it is 1.3 times the dry flash-over Voltage.

Standard Specifications : IS 731, BS-137 & IEC-383

Post Insulators

Standard Particulars Product No. 32 35   Highest System Voltage, kV 12 24 Leakage Distance, mm 320 450   Cantilever Strength   Upright, Kgf 510 918 Underhung, Kgf 310 612 Tensile Strength, Kgf 1530 3060 Torsional Strength, Kgm 21 70 Compression Strength, Kgf 3060 4079     Flashover   Voltage    Power  Frequency Dry kVRms 70 90 Wet kVRms 45 60   Impulse Positive, kVp 95 140 Negative, kVp 120 185     Withstand Voltage   Power Frequency Dry kVRms 55 80 Wet kVRms 40 55   Impulse Positive, kVp 75 125 Negative, kVp 95 160 Galvanizing Test as per IS 2633-1964 Power Frequency Puncture Voltage, kV 1.3 times the dry flash-over Voltage

Standard Specification : IS : 5350 & IS : 2544

Transformer Bushings

TRANSFORMER BUSHINGS 12-17.5 kV

Standard Particulars Product No. 1101 1102 1103 1104 Ratings 12 kV/ 250 Amp 12 kV/400 630 Amp 12 kV/ 1000 Amp 12 kV/ 2000-3150 Amp Power Frequency One minute Dry, kVRms 50 50 50 50 WithstandVoltage Wet, kVRms 45 45 45 45 Impulse Withstand Voltage, kVp 95 95 95 95

Standard Specifications : IS 3347 Part III/Sec 1& IS 2099 & IEC-233

TRANSFORMER BUSHINGS 24 kV

Standard Particulars Product No. 2201 2202 2203 2204 Ratings 24 kV/ 250 Amp 24 kV/400 630 Amp 24 kV/ 1000 Amp 24 kV/2000 3150 Amp Dimensions A mm 145 155 175 190 B mm 150 160 180 200 C mm 155 165 185 210 D mm Min 32 39 58 74 E mm Max 111 128 163 183 Product Frequency One Minute Withstand Voltage Dry, kV 60 60 60 60 Wet, kV 55 55 55 55 Impulse Withstand Voltage, kVp 125 125 125 125

Standard Specifications : IS 3347 Part 4/Sec 1 & IS 2099 & IEC-233

TRANSFORMER BUSHINGS 36 kV

Standard Particulars Product No. 3302 3303 3304 3305 Ratings 36 kV/250 Amp 36 kV/400- 630 Amp 36 kV/1000 Amp 36 kV/2000-3150 Amp Visible Discharge Voltage, kV 27 27 27 27 Power Frequency One Minute Withstand Voltage Dry kV 80 80 80 80 Wet kV 75 80 80 80 Impulse Withstand Voltage, kVp 180 180 180 180

Standard Specifications : IS 3347 Part V/Sec 1 & IS 2099 & IEC-233

TRANSFORMER BUSHINGS 1 kV

Standard Particulars Product No. 0101 0102 0103 0104 0105 Ratings 1.1 kV/250 Amp 1.1 kV/400,630 Amp 1.1 kV/1000 Amp 1.1 kV/2000 Amp 1.1 kV/3150 Amp Part I II I II I II I II I II Dimensions A mm 50 60 70 85 90 110 104 125 125 150 B mm min 14 20 22 28 32 37 44 51 50 61 C mm 70 30 80 30 85 35 85 35 85 35 D mm 45 50 55 70 55 90 55 104 55 125 E mm 27 26 43 41 53 46 66 64 86 80 F mm 34 30 49 46 67 57 82 70 100 90 Power Frequency Withstand Voltage Dry kV 12 - 12 - 12 - 12 - 12 - Wet kV 10 - 10 - 10 - 10 - 10 -

Standard Specifications : IS 3347 Part 1/Sec 1 & IS 7421& IEC-233

TRANSFORMER BUSHINGS 3.6 kV

Standard Particulars Product No. 0304 0305 0301 0302 0303 Ratings 3.6 kV/250 Amp 3.6 kV/400, 630 Amp 3.6 kV/1000 Amp 3.6 kV/2000 Amp 3.6 kV/3150 Amp Part I II I II I II I II I II Dimensions A mm 75 70 90 85 110 110 125 125 145 150 B mm 32 60 47 70 65 90 80 105 100 125 C mm 32 40 47 46 65 57 80 70 10 0 90 D mm 37 26 43 41 53 46 66 64 86 80 E mm 14 20 22 28 32 37 44 51 50 61 F mm 60 - 70 - 90 - 105 - 125 - Power Frequency Withstand Voltage Dry kV 21 - 21 - 21 - 21 - 21 - Wet kV 21 - 21 - 21 - 21 - 21 - Impulse Withstand Voltage, kVp 45 - 45 - 45 - 45 - 45 -

Standard Specification : IS 3347 Part II/Sec 1 & 2099 & IEC - 233

Cable Box Bushings

Standard Particulars Product No. CB-1111 CB-1112 CB-2201 CB-3301 Transformer Rating 11 kV/ 350 Amp 11 kV/ 1400 Amp 22 kV/ 350 Amp 33 kV/ 350 Amp Visible Discharge Voltage, Kv 9 9 18 27 Power Frequency Withstand Voltage, Dry, Kv 35 40 55 75 Power Frequency Puncture Voltage, Kv 60 70 85 120 Impulse Withstand Voltage, Kvp 95 100 150 180 Net Weight (approx.) Kg 1.1 1.8 2.8 6.0

Standard