SCHEDULE - A
GUARANTEED TECHNICAL PARTICULARS
33 Kv DISC INSULATOR B & S TYPE
Sl.
No.
Description
Unit
33 Kv Disc. String B & S type
insulator EMS - 70KN.
1
Disc Diameter
mm
255
2
3
mm
145
4
5
6
7
8
9
Disc spacing
Creepage distance
(a) Total
(b) Protected
Combined electromechanical strength.
Dry one minute power frequency withstand
Wet one minute power frequency withstand.
Dry power frequency flashover.
Wet power frequency flashover.
Dry impulse withstand positive & negative.
840
420
7,000
75
10
Impulse flashover 1 x 50 microsecond (Positive)
11
Impulse flashover 1 x 50 microsecond (Negative)
12
Power frequency puncture voltage
mm
mm
Kgs.
Kv
Kv
Kv
Kv
Kv
(Peak)
Kv
(Peak)
Kv
(Peak)
Kv
13
14
15
High system voltage.
Visible Discharge voltage.
Weight/Unit.
Kv
Kv
Kg.
36
27
16
Marking :--
Each insulator will be legibly marked to show the
following :
(a) Name of the Purchaser :-- WESCO
170
1.3 times the actual drive flashover
voltage of the unit.
(a) Name or trademark :-(c) Month & year of manufactureing :-(d) Minimum failing load.
PACKING: -- All insulators shall be packed suitably for easy but rough handling & acceptable for road
transport. Where more than one insulator is packed in a crate, separator shall be fixed between the
insulators to keep individual insulator in position without movement in the crate.
SCHEDULE - A
GUARANTEED TECHNICAL PARTICULARS
11 Kv & 33 Kv PIN INSULATOR
Sl.
No.
1
2
3
4
5
6
7
Description
11 Kv PIN INSULATOR
11 Kv (rms)
12 Kv (rms)
9 Kv (rms)
65 Kv (rms)
35 Kv (rms)
110 Kv (rms)
80 Kv peak
80 Kv peak
205 Kv peak
240 Kv peak
14
15
16
17
Normal working voltage
High system voltage.
Visible Discharge voltage dry PF.
1 Minute withstand voltage wet PF.
1 Minute withstand voltage.................
PF puncture withstand voltage.
Impulse withstand voltage :
(+ ve)
(- ve)
Impulse flashover voltage :
(+ ve)
(- ve)
Minimum failing load.
Minimum creepage distance.
Colour of glaze.
Weight per unit.
Size of insulator. (Height)
(Diameter)
Material of thimble.
Steel head.
Standard.
Tolerance.
33 Kv PIN
INSULATOR
33 Kv (rms)
36 Kv (rms)
27 Kv (rms)
95 Kv (rms)
75 Kv (rms)
180 Kv (rms)
18
Marking :--
8
9
10
11
12
13
90 Kv peak
205 Kv peak
120 Kv peak
240 Kv peak
5 KN.
10 KN.
240 mm.
580 mm.
Brown.
Brown.
1.4 Kg. (Apprx.)
8.6 Kg. (Apprx.)
125 mm.
225 mm.
125 mm.
285 mm.
Lead.
Lead.
Small head.
Large head.
IS : 731/1971.
IS : 731/1971.
Tolerance will be allowed as per IS : 731/1971
or latest amendments if any.
Each insulator will be legibly marked to show
the following :
(a) Name of the Purchaser :-- WESCO
(b) Name or trademark :-(c) Month & year of manufactureing :-(d) Minimum failing load.
PACKING :-- All insulators shall be packed in wooden crates suitable for easy but rough handling &
acceptable for road transport. Where more than one insulator are packed in a crate, separator shall be
fixed between the insulators to keep individual insulator in position without movement in the crate.
SCHEDULE - A
GUARANTEED TECHNICAL PARTICULARS
11 Kv Disc. String T & C type insulator EMS - 45KN.
Sl.
No.
Description
Unit
mm
11 Kv Disc. String
T & C type
insulator EMS 45KN.
255
11 Kv Disc. String
B & S type
insulator EMS 70KN.
255
1
Disc Diameter
2
3
4
5
6
7
8
9
Disc spacing
Creepage distance
(a) Total
(b) Protected
Combined electromechanical strength.
Dry one minute power frequency withstand
Wet one minute power frequency withstand.
Dry power frequency flashover.
Wet power frequency flashover.
Dry impulse withstand positive & negative.
mm
145
145
10
Impulse flashover 1 x 50 microsecond (Positive)
11
Impulse flashover 1 x 50 microsecond (Negative)
12
13
14
15
16
Power frequency puncture voltage
High system voltage.
Visible Discharge voltage.
Weight/Unit.
Marking :--
mm
290
290
mm
170
170
Kgs.
4,550
7,000
Kv
70
70
Kv
40
40
Kv
80
80
Kv
50
50
Kv
75
75
(Peak)
Kv
125
125
(Peak)
Kv
130
130
(Peak)
Kv
110
110
Kv
12
12
Kv
9
9
Kg.
5.8 (Apprx.)
4.6 (Apprx.)
Each insulator will be legibly marked to show the
following :
(a) Name of the Purchaser :-- WESCO
(a) Name or trademark :-(c) Month & year of manufacturing :-(d) Minimum failing load.
PACKING: -- All insulators shall be packed suitably for easy but rough handling & acceptable for road
transport. Where more than one insulator is packed in a crate, separator shall be fixed between the
insulators to keep individual insulator in position without movement in the crate.