SCHEDULE - A
GUARANTEED TECHNICAL PARTICULARS
11 KV PIN INSULATORS
Sl.
No.
1
2
3
4
5
6
7
8
Description
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.
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
90 Kv peak
120 Kv peak
9
5 KN.
10
240 mm.
11
Brown.
12
1.4 Kg. (Apprx.)
13
125 mm.
125 mm.
14
Lead.
15
Small head.
16
IS : 731/1971.
17
Tolerance will be allowed as per IS :
731/1971 or latest amendments if
any.
18
Marking :-Each insulator will be legibly marked
to show the following :
(a) Name of the Purchaser :-WESCO
(b) Name or trademark :-(c) Month & year of manufacturing :-(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.
Description
No.
Unit
1
Disc Diameter
2
3
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.
4
5
6
7
8
9
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
11 KV Disc.
String T & C
type insulator
EMS - 45KN.
255
11 Kv Disc.
String B & S type
insulator EMS 70KN.
255
mm
145
145
mm
mm
Kgs.
290
170
4,550
290
170
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.