E N E R G Y S E C T O R
I S O F L O N E C O M P O S I T E I N S U L A T O R S F O R D I S T R I B U T I O N L I N E S
T E N S I O N / S U S P E N S I O N A N D P I N I N S U L A T O R S
T E N S I O N / S U S P E N S I O N A N D P I N I N S U L A T O R S
B205_0913_en

E N E R G Y
I S O F L O N E
S E C T O R
C O M P O S I T E I N S U L A T O R S F O R D I S T R I B U T I O N L I N E S
T E N S I O N / S U S P E N S I O N A N D P I N I N S U L A T O R S
T E N S I O N / S U S P E N S I O N A N D P I N I N S U L A T O R S
End fittings
Standard end fittings are made in stamped steel, hot dip galvanized. They are designed following IEC standards
S B C T Y E
Size 16A IEC 60120 Size 16 IEC 60120 Size 16L IEC 60120 Size 16L IEC 60120 Size 16 IEC 61466 Size 17 IEC 61466
Light & Medium pollution
SML
Code reference
Type reference
Number of sheds
Coupling length
Arching distance
Leakage distance
Lightning impulse withstand
Dry power frequency withstand kV
(kN)
SIS130799 TWE-A3-40SB 7 308 260 690 200 110 12
40
SIS090714 TWE-A4-40SB 10 385 360 975 223 130 24
70
SIS130412 TWE-A3-70SB 7
SIS090715 TWE-A4-70SB 10
343
420
260 690
360 975
200
223
110 12
130 24
SIS130405 TWE-A5-70SB 13 498 420 1285 280 160 36
Light & Medium pollution
SCL
Code reference
(kN)
Type reference
Number of sheds
Height length
Arching distance
Leakage distance
Lightning impulse withstand
Dry power frequency withstand kV
[mm] [kV]
B205_0913_en

E N E R G Y S E C T O R
I S O F L O N E C O M P O S I T E I N S U L A T O R S F O R D I S T R I B U T I O N L I N E S
Z I N C O X I D E S U R G E A R R E S T E R M .
.
V .
.
a n d H .
.
V .
.
Z I N C O X I D E S U R G E A R R E S T E R M .
.
.
V .
.
.
– H .
.
.
V A
B206_0913_en

The continued research for protection equipment’s on the electrical apparatus in order to contain voltage surges, which can occur in M.V. and H.V. transmission and distribution networks, has induced isoelectric
engineers to develop a zinc oxide (ZnO) surge arrester with electrical performance, high mechanical strength, seismic performance and explosion proof.
The silicone housing of surge arresters (SILIC. 1.75) gives it all the improved service requirements and reliability for the networks where it is installed.
ZnO surge arresters provide primary protection against voltage surges caused by external agents or by disturbances in the transmission system such as the opening and closing of switches, earth faults, mishandling of equipment etc.
If these surges exceed the insulation level (BIL = Basic Insulation Level) the equipment’s can be damaged.
Surge arresters limit these surges to a safety level (less than the BIL of the equipment) thus protecting the station equipment.
The maximum voltage that the arresters can transmit to the station it is connected with, is called the “
Level of protection of the surge arrester
”.
The difference between the BIL and the “ level of protection of the surge arrester
” is called the “ margin of protection
”.
The isoelectric
zinc oxide (ZnO) surge arresters, compared with the earlier silicon carbide resistor types, are able, from an operational point of view, to discharge energy associated with a surge wave by means of an earth phase connection of very low independence, drastically delimiting, in this way, the subsequent current.
One of the most important differences between the silicon carbide arrester SiC and the zinc oxide arrester ZnO, is that at the same operation voltage (MCOV) the leakage current varies notably (from 30 µA for ZnO to 300 A for SiC).
An important quantity of the ZnO arrester is its capacity to withstand transitory overvoltages and other disturbances in the system. isoelectric - Italy
99-7
1

The zinc oxide elements have an extremely non linear current voltage characteristic and an excellent capacity for energy dissipation that allow the elements to guarantee the functions:
??
Level protection, defined in the field of high current (1-20 kA) and from the capacity to withstand over-voltage in the field of low currents (less than 1 A) and coincides with the phase-earth operating voltage of the system where it is installed.
??
Such intervention so as not to produce system disturbances that could prejudice the continuity of the service and abnormal stresses on the components of the network.
??
Capacity to withstand any energy based stress associated without damage or changes in operating characteristics.
??
Ability to limit over-voltage and to absorb associated energy.
??
Capacity to absorb high intensity currents of short and long duration.
??
Elimination of slow intervention to the service voltage in the presence of the phenomenon of pollution on the external surface of the arresters exemplary internal structure.
CHOICE OF THE ZINC OXIDE ZnO SURGE ARRESTER
The choice of the correct rated voltage of a surge arrester is a compromise between the level of protection and the capacity to withstand over-voltage in the system.
Knowing the earthling data and the values of the transient over-voltage one can determine the value of the rated voltage of the surge arrester.
??
Raising the rated voltage increases the capacity of the surge arrester to withstand temporary over-voltages, however it reduces the protection margin. Therefore it is necessary to choose an arrester with the minimum permissible voltage using a pitch apparatus system.
??
Lowering the rated voltage increases the dangers of failure during the operation.
CORRECT INSTALLATION OF THE ZINC OXIDE ZnO SURGE ARRESTER.
The protection against over-voltages in a station for direct lightning strikes, is not based solely on the correct choice of a surge arrester but also on a number of important elements:
??
Decreasing the distance between the arrester and the equipment to be protected.
??
Installing further surge arresters at the entrance of the lines.
??
Correct calculation of the discharge current at the presence of lightning because lightning can cause currents with steeper fronts.
??
Precise verification of the perfect installation of the ZnO surge arrester and the resistance of the earth system. isoelectric - Italy
99-7
2

GENERAL isoelectric
is the first company to produce surge arresters housed in silicone rubber and it is the only company to cover all the system voltages, from low voltage (L.V.) to distribution (M.V.), to transmission (H.V.).
From a continuos development programme isoelectric
has produced three series of
Zinc Oxide Surge Arresters housed in silicone which are certified from CESI laboratory according to the IEC 99-4 (1998).
We can also produce according to ANSI/IEEE C.62 11.
The surge arresters described in this brochure are the following:
ISI-EG* series: Rated voltage : from 6 kV to 36 kV.
Nominal discharge current : 5 kA.
Standard : IEC 99-4 1998
ISI-HE* series: Rated voltage : from 6 kV to 36 kV.
Nominal discharge current : 10 kA.
Standard : IEC 99-4 1998
Line discharge class: 1, for particular application we can made line discharge class 2.
ISI-2P* series: Rated voltage : from 36 kV to 165 kV.
Nominal discharge current : 10 kA.
Standard : IEC 99-4 1998
Line discharge class: 3
ISI-3P*, 4P*, 5P* series: Rated voltage : from 108 kV to 468 kV.
Nominal discharge current :
??
ISI-3P* 10 kA
??
ISI-4P* 20 kA
??
ISI-5P* 30 kA
Standard : IEC 99-4 1998
Line discharge class:
??
ISI-3P* 3 and 4
??
ISI-4P* 4 and 5
??
ISI-5P* 5
The different line discharge class and nominal discharge current are obtained by series and parallel construction comprises individual surge arrester units rated from 27 to 36 kV interconnected by means of a corona aluminium alloy intermediate rings. isoelectric - Italy
00-4
3

CONSTRUCTION
The construction of this range is well proved and the service performance has been well tested in climates ranging from the arctic circle with an average variable temp. of +60°.
The ZnO block is composed of a series of non linear resistors achieved by means of a sintering process of extremely compacted ceramic dust, made up of principally Zinc
Oxide and small quantities of other metal oxides such as bismuth, cobalt, antimony and manganese oxide.
The method of the internal construction is composed of a high strength bond in an uniform manner in order to avoid condensation and entrapment of air voids. isoelectric surge arresters are built according to a stringent quality control procedure and all the material and construction methods are subject to 100% checks.
The advantage of the reduced weight with respect to the porcelain housed arresters has recently grown from an intrinsic service safety point of view.
This range of silicone housed surge arresters has been subjected to water-proofs tests according to discharge pressure test requirements for greater safety of personnel in areas of high seismic risk.
APPLICATIONS
This range of surge arresters in silicone has the unique characteristic of a higher resistance to bending breaking point such that series ISI-EG* and ISI-HE* surge arresters can be used to substitute cable support insulators on H.V. terminals with reduced cost, the result is more aesthetically acceptable and it should be noted that this type of installation cannot be achieved with arresters of a lower construction strength.
The vandal proof, non-explosive failure mode, low weight, small size, suitable for installation in heavy salt coastal environments, resistant to transport damage, careless handling and easy to install, they all are additional positive characteristics of our arresters.
POLLUTION PERFORMANCE
Global pollution is becoming an enormous problem.
This range of silicone surge arresters can be used in highly polluted regions including coastal areas with saline fog conditions, without any their protection characteristics the housing material used by isoelectric
“SILIC. 1.75” has complete tests documentation according to all the standards in force.
For this problems, we have made two different types of housing sheds, the first for normal pollution and the second for high pollution. isoelectric - Italy
99-7
4

NORMAL POLLUTION SHEDS
Nominal Discharge Current : 5 kA peak
High Current Operation Duty : 65 kA peak Pressure Relief : 16 kA
Long Duration Current : 125 A peak / 2000
?
sec type
ISI-EGA06
Max cont. Temporary
Rated Operating over-voltage
Voltage
Ur
6
Voltage
MCOV kV rms kV rms
4.80 for 1 sec.
TOV kV rms
7.00
Max residual voltage with current wave (kV peak)
8/20
?
s at: Switching Steep height Leak. Net
30/90
?
s 1/2
?
s (A) dist. weight
100 2.5 5 10 20 125 500 10 ± 20 approx
Ap kAp kAp kAp kAp kAp Ap Ap kAp mm mm Kg
15.0 17.5 18.5 19.5 22.0 25.5 15.0 15.5 23.0 185 390 1.6
ISI-EGA09 9
ISI-EGA10 10.5
7.20
8.20
10.5
12.0
22.5 26.5 27.5 29.0 32.5 37.5 22.5 23.0 34.5 185 390 1.7
27.0 31.0 33.5 34.0 38.5 44.5 26.5 27.5 40.5 185 390 1.8
ISI-EGA12
ISI-EGA15
ISI-EGB18
ISI-EGB21
ISI-EGB24
ISI-EGC27
ISI-EGC30
ISI-EGC33
ISI-EGC36
24
27
30
33
36
12
15
18
21
9.60
12.0
14.4
16.8
19.2
21.6
24.0
26.4
28.8
14.0
17.5
21.0
24.5
28.0
31.5
35.0
38.5
42.0
30.0 35.0 36.5 39.0 43.5 50.5 30.0 31.0 46.0 185 390 1.9
37.5 43.5 45.5 48.5 54.0 62.0 37.5 38.5 57.5 185 390 2.1
45.0 52.5 54.5 58.5 65.0 75.0 45.0 46.0 69.0 245 500 2.5
52.5 61.0 63.5 65.0 75.5 86.5 52.5 53.5 80.5 245 500 2.6
60.0 69.5 73.0 78.5 86.5 99.5 60.0 61.5 92.0 265 500 2.8
67.5 78.5 82.0 88.5 97.0 112 67.5 69.0 104 305 690 2.9
74.5 87.0 91.0 97.5 108 124 74.5 76.5 115 330 690 3.1
82.0 95.5 100 108 119 137 82.0 84.5 127 380 940 3.2
89.5 105 109 114 130 150 89.5 92.0 138 380 940 3.4 isoelectric - Italy
99-7
5

HIGH POLLUTION SHEDS
Nominal Discharge Current : 5 kA peak
High Current Operation Duty : 65 kA peak
Long Duration Current : 125 A peak / 2000
Pressure Relief : 16 kA
?
sec type
ISI-EGA06
Max cont. Temporary
Rated operating over-voltage voltage
Ur
6 voltage
MCOV kV rms kV rms
4.80 for 1 sec.
TOV kV rms
7.00
Max residual voltage with current wave (kV peak)
8/20
?
s at: Switching Steep height Leak. Net
30/90
?
s 1/2
?
s (A) dist. weight
100 2.5 5 10 20 125 500 10 ± 20 approx
Ap kAp kAp kAp kAp kAp Ap Ap kAp mm mm Kg
15.0 17.5 18.5 19.5 22.0 25.5 15.0 15.5 23.0 185 400 1.6
ISI-EGA09 9
ISI-EGA10 10.5
ISI-EGA12
ISI-EGA15
ISI-EGB18
ISI-EGB21
ISI-EGB24
ISI-EGC27
ISI-EGC30
ISI-EGC33
ISI-EGC36
12
15
18
21
24
27
30
33
36
7.20
8.20
9.60
12.0
14.4
16.8
19.2
21.6
24.0
26.4
28.8
10.5
12.0
14.0
17.5
21.0
24.5
28.0
31.5
35.0
38.5
42.0
22.5 26.5 27.5 29.0 32.5 37.5 22.5 23.0 34.5 185 400 1.7
27.0 31.0 33.5 34.0 38.5 44.5 26.5 27.5 40.5 185 400 1.8
30.0 35.0 36.5 39.0 43.5 50.5 30.0 31.0 46.0 185 400 1.9
37.5 43.5 45.5 48.5 54.0 62.0 37.5 38.5 57.5 185 400 2.1
45.0 52.5 54.5 58.5 65.0 75.0 45.0 46.0 69.0 245 620 2.5
52.5 61.0 63.5 65.0 75.5 86.5 52.5 53.5 80.5 245 620 2.6
60.0 69.5 73.0 78.5 86.5 99.5 60.0 61.5 92.0 265 620 2.8
67.5 78.5 82.0 88.5 97.0 112 67.5 69.0 104 305 760 2.9
74.5 87.0 91.0 97.5 108 124 74.5 76.5 115 330 760 3.1
82.0 95.5 100 108 119 137 82.0 84.5 127 380 1040 3.2
89.5 105 109 114 130 150 89.5 92.0 138 380 1040 3.4 isoelectric - Italy
99-7
6

NORMAL POLLUTION SHEDS
Line Discharge Class : 1
Long Duration Current : 250 A peak / 2000
?
sec
Pressure Relief : 20 kA
Energy Withstand : 4,1 kJ/kV @ 2000
?
sec
Nominal Discharge Current : 10 kA peak
High Current Operation Duty : 100 kA peak type
ISI-HEA06
Max cont. Temporary
Rated operating over-voltage voltage
Ur
6 voltage
MCOV kV rms kV rms
4.80 for 1 sec.
TOV kV rms
7.00
Max residual voltage with current wave (kV peak)
8/20
?
s at: Switching Steep height Leak. Net
30/90
?
s 1/2
?
s (A) dist. weight
100 2.5 5 10 20 125 500 10 ± 20 approx
Ap kAp kAp kAp kAp kAp Ap Ap kAp mm mm Kg
14.5 16.5 17.5 18.5 20.0 25.0 14.5 15.0 23.0 185 360 2.1
ISI-HEA09 9
ISI-HEA10 10.5
ISI-HEA12
ISI-HEA15
12
15
ISI-HEB18
ISI-HEB21
ISI-HEB24
ISI-HEC27
18
21
24
27
ISI-HEC30
ISI-HEC33
ISI-HEC36
30
33
36
7.20
8.20
9.60
12.0
14.4
16.8
19.2
21.6
24.0
26.4
28.8
10.5
12.0
14.0
17.5
21.0
24.5
28.0
31.5
35.0
38.5
42.0
21.5 25.0 26.0 28.0 30.0 36.0 21.5 22.0 34.5 185 360 2.2
23.0 28.5 30.5 33.5 38.5 43.0 25.5 25.0 40.0 185 360 2.4
26.5 33.0 34.5 37.0 43.5 48.5 28.5 29.5 46.0 185 360 2.6
35.5 41.5 43.5 46.0 53.5 59.5 34.5 36.5 57.5 185 360 2.8
43.0 50.0 52.0 55.5 61.5 68.5 43.0 44.0 69.0 245 460 3.2
50.0 57.5 60.5 64.5 71.5 86.5 50.0 51.5 80.5 245 460 3.4
57.0 66.0 69.0 74.0 81.0 90.0 57.0 58.5 92.0 270 460 3.6
64.0 74.0 78.0 83.0 92.5 104 64.0 66.0 104 305 635 4.2
71.0 83.0 87.5 92.0 100 112 71.0 73.5 115 330 635 4.4
78.5 91.0 96.0 102 110 123 78.5 80.5 127 380 905 4.6
85.5 99.0 104 111 117 133 85.5 88.0 138 380 905 5.2 isoelectric - Italy
99-7
7

HIGH POLLUTION SHEDS
Line Discharge Class : 1
Long Duration Current : 250 A peak / 2000
?
sec
Pressure Relief : 20 kA
Energy Withstand : 4,1 kJ/kV @ 2000
?
sec
Nominal Discharge Current : 10 kA peak
High Current Operation Duty : 100 kA peak type
ISI-HEA06
Max cont. Temporary
Rated operating over-voltage voltage
Ur
6 voltage
MCOV kV rms kV rms
4.80 for 1 sec.
TOV kV rms
7.00
Max residual voltage with current wave (kV peak)
8/20
?
s at: Switching Steep height Leak. Net
30/90
?
s 1/2
?
s (A) dist. weight
100 2.5 5 10 20 125 500 10 ± 20 approx
Ap kAp kAp kAp kAp kAp Ap Ap kAp mm mm Kg
14.5 16.5 17.5 18.5 20.0 25.0 14.5 15.0 23.0 185 370 2.1
ISI-HEA09 9
ISI-HEA10 10.5
ISI-HEA12
ISI-HEA15
12
15
ISI-HEB18
ISI-HEB21
ISI-HEB24
18
21
24
27 ISI-HEC27
ISI-HEC30
ISI-HEC33
ISI-HEC36
30
33
36
7.20
8.20
9.60
12.0
14.4
16.8
19.2
21.6
24.0
26.4
28.8
10.5
12.0
14.0
17.5
21.0
24.5
28.0
31.5
35.0
38.5
42.0
21.5 25.0 26.0 28.0 30.0 36.0 21.5 22.0 34.5 185 370 2.2
23.0 28.5 30.5 33.5 38.5 43.0 25.5 25.0 40.0 185 370 2.4
26.5 33.0 34.5 37.0 43.5 48.5 28.5 29.5 46.0 185 370 2.6
35.5 41.5 43.5 46.0 53.5 59.5 34.5 36.5 57.5 185 370 2.8
43.0 50.0 52.0 55.5 61.5 68.5 43.0 44.0 69.0 245 570 3.2
50.0 57.5 60.5 64.5 71.5 86.5 50.0 51.5 80.5 245 570 3.4
57.0 66.0 69.0 74.0 81.0 90.0 57.0 58.5 92.0 270 570 3.6
64.0 74.0 78.0 83.0 92.5 104 64.0 66.0 104 305 765 4.2
71.0 83.0 87.5 92.0 100 112 71.0 73.5 115 330 765 4.4
78.5 91.0 96.0 102 110 123 78.5 80.5 127 380 1000 4.6
85.5 99.0 104 111 117 133 85.5 88.0 138 380 1000 5.2 isoelectric - Italy
99-7
8

1 .
.
.
Polymeric surge arrester housed in silicone rubber type ISI-EG* or ISI-HE*
2 .
.
.
Insulated mounting bracket
3 .
.
.
Earth strap with M12 holes
4 .
.
.
Epoxy cycloaliphatic resin insulator with M12 fixing
5 .
.
.
Disconnector
6 .
.
.
Metallic base pedestal
7 .
.
.
Metallic mounting bracket with M12 holes isoelectric - Italy
99-7
9

Type ISI-3P*; ISI-4P*; ISI-5P* isoelectric - Italy
99-7
10

HIGH POLLUTION SHEDS
ISI-2P*
Nominal Discharge Current :
10 kA peak
High Current Operation Duty :
100 kA peak
Long Duration Current :
500 A peak / 2000
?
sec
Pressure Relief :
20 kA
Energy Withstand :
8,0 kJ/kV @ 2000
?
sec
Line Discharge Class :
2 type
ISI-2P1S036
ISI-2P2S054
ISI-2P2S060
ISI-2P2S072
ISI-2P3S084
ISI-2P3S096
ISI-2P3S108
ISI-2P4S120
ISI-2P4S132
ISI-2P4S144
ISI-2P5S150
ISI-2P5S165
Max cont. Temporary
Rated operating over-voltage voltage
Ur kV rms voltage
MCOV kV rms for 1 sec.
Max residual voltage with current wave
8/20
?
s at:
(kV peak)
Switching Steep height
Recomm.
Leakage minimum Net
30/90
?
s 1/2
?
s
(A) Distance dist. line weight
TOV 5 10 20 125 500 10 ± 20 kV rms kAp kAp kAp Ap Ap kAp mm mm to earth approx.
mm Kg
36 28.8 42.0 111 117 133 85.5 88.0 138 430 1000 250 20
54
60
43.2
48.0
63.0
70.0
166
184
185
200
208
224
128
142
132
147
208
230
820
820
2000
2000
300
350
35
38
72
84
96
108
120
57.6
67.2
76.8
86.4
96.0
84.0
98.0
112.0
126.0
140.0
222
258
296
333
368
234
285
320
351
400
266
320
358
399
448
171
199
228
257
284
176
206
235
264
294
276
323
369
414
460
820
1210
1210
1210
1600
2000
3000
3000
3000
4000
420
470
550
620
670
41
50
53
56
65
132
144
150
165
105.6
115.2
120.0
132.0
168.0
175.0
192.5
408 440 492 314 322 508 1600 4000
444 468 532 342 352 552 1600 4000
460 500 560 355 368 575 1990 5000
510 550 615 393 403 635 1990 5000
750
800
850
900
68
71
85
88 isoelectric - Italy
99-7
11

ZINC OXIDE POLYMERIC ARRESTERS type ISI-3P*; ISI-4P*; ISI-5P*
HIGH POLLUTION SHEDS
High Current Operation Duty :
100 kA peak
Pressure Relief :
20 kA
ISI-3P*
Nominal Discharge Current :
10 kA peak
Long Duration Current :
750 A peak / 2000
?
sec
Energy Withstand : 10 kJ/kV
ISI-4P*
Nominal Discharge Current :
20 kA peak
Long Duration Current :
1000 A peak / 2000
?
sec
Energy Withstand : 13 kJ/kV type
ISI-3P3S108
ISI-3P4S132
ISI-3P5S150
ISI-3P6S198
ISI-3P6S216
ISI-3P7S250
ISI-4P9S324
ISI-4P10S345
ISI-4P10S360
ISI-4P11S396
ISI-5P12S432
ISI-5P13S468
ISI-5P*
Nominal Discharge Current :
30 kA peak
Long Duration Current :
1250 A peak / 2000
?
sec
Energy Withstand : 16 kJ/kV
Rated voltage
Ur kV rms
Max cont.
MCOV kV rms
Temporary operating over-voltage voltage for 1 sec.
TOV
Max residual voltage with current wave
8/20
?
s at:
(kV peak)
Switching Steep height
Recomm.
Leakage minimum Net
5 10 20
30/90
?
s 1/2
?
s (A) Distance dist. line weight
125 500 10 ± 20 to earth approx.
kV rms kAp kAp kAp Ap Ap kAp mm mm mm Kg
108
132
150
198
216
250
324
345
360
396
432
468
86.4
105.6
120
158.4
172.8
201.6
259.2
273.6
288
316.8
345.6
374.4
126
154
175
231
252
294
378
399
420
462
504
546
333 351 399 257 264 414 1170 3000
408 440 492 314 322 508 1560 4000
460 500 560 355 368 575 1950 5000
650
750
850
612 660 738 471 483 762 2340 6000 1100
666 702 798 513 528 828 2340 6000 1200
777 819 931 599 616 966 2730 7000 1350
999 1053 1197 770 792 1242 3510 9000 1750
1053 1120 1267 812 837 1311 3900 10000 1900
1110 1170 1330 855 880 1380 3900 10000 2000
1221 1287 1463 940 968 1518 4290 11000 2200
1332 1404 1596 1026 1056 1656 4680 12000 2400
1443 1521 1729 1112 1144 1794 5070 13000 2600
65
85
105
125
135
155
195
215
225
245
265
290 isoelectric - Italy
99-7
12

E N E R G Y S E C T O R
I S O F L O N E C O M P O S I T E I N S U L A T O R S F O R D I S T R I B U T I O N L I N E S
S I L I C O N E R U B B E R F U S E C U T O U T
S I L I C O N E R U B B E R F U S E C U T O U T
B207_0913_en

The first silicone rubber CUTOUT was born throught the twenty years experiences of Isoelectric which is the market leader in the composite line post and suspension insulators made in “SILISOL” silicone rubber.
Isoelectric, keeping into account the problems of using porcelain material has developed a high quality product with interesting mechanical and electrical features as well as high pollution performances.
Further the silicone is the only one who can keep its hydrophobicity property during all its insulating life.
Other materials such as EPDM can be hydrophobicity but they loose this property in a very short time once put in service.
The silicone rubber offers higher stability towards heat and UV rays than the other polymers.
Desde la vicenal experiencia de Isoelectric, leader en el sector de los aisladores compositos de sospension y de soporte en silicon
“SILISOL”, se ha creado el primero CUTOUT en silicon.
Isoelectric, considerando los problemas que existen en la utilizacion del material de procelana, ha realizado un producto de calidad con caracteristicas mecenicas y electricas interesantes y unaoptima resistencia a la contaminacion.
Ademas el silicon tiene la unica capacidad de mantener la propria idrophobicidad durante la vida de aislamento.Otros materiales polymericos, tal como l’EPDM, pueden ser idrophobicos pero pierden esta propriedad despues de un periodo relativamente breve de servicio. Ademas el silicon dona mayor estabilidad por lo que concierne el calor y la radiacion UV de los otros polimeros.
■ High impact resistance
(even again gunshots)
■ Reduced weight
(from 3 to 10 times in relation to the porcelain cutouts)
■ High resistance in cool enviroments
(low temperature)
■ High resistance in high polluted enviroments
(pollution)
■ High resistance to ultra-violetradiations
■ High resistance to power arc
■ Higher leakage distance with the same spark gaps.
■ Lower transport costs
■ Lower packing and storage costs
■ Higher hydrophobicity and corrosion-resistance properties that keep the insulators surface clean and improve from one side the rain cleaning action and, on the other side, avoid the damages due to salinity, dusts and corrosive industrial smokes improving the surface resistivity.
■ Muy alta tolercancia a ls impactos
(tambien contro los disparos)
■ Reduccion del peso (en relacion desde 30 hasta
100 veces menor de los de porcellana)
■ Muy alta tolerancia al frio
(bajas temperaturas)
■ Muy alta tolerancia en los ambientes con alta contamination
■ Alta tolerancia a los rayos UV
■ Mayor linea de fuga en iguales distancias espinterometricas
■ Minor costos de transporte
■ Minor costo de embalaje y almacenamiento
■ Minor costos de instalacion
■ Una alta prorpiedad de idrorepelencia y toleranca a la corosion ayudan a quedar limpia la superficie del aislador facilitando, de un lado, el accion de lavaje propria del silicon evitando, del otro lado, el ataque de las superficies de la salinidad marina, de los polvos y de los humus industriales corrosivos ameliorando asì la tolerancia superficial.

NUMBER
5
6
7
3
4
1
2
DESCRIPTION
Back Plate
Long bolts
Mounting Bracket
Silicone Rubber Insulator
Spring Washer
Upper Housing
Fuse Tube
NUMBER
8
9
10
11
12
13
DESCRIPTION
Lower Housing
Toggle Joint
Connector
Upper Contacts
Operating
Hooks Attachment

TYPE
ISI-CUT15
ISI-CUT24
ISI-CUT36
Rated voltage
15
24
36
* Fuse Tube max. 100 A
* Supply without fuse kV
BIL
125
150
190
Power Frequency Withstand
DRY kV WET kV
Leakage Distance mm
Phase/Ground Phase/Phase
WEIGHT kg
60
75
45
60
480
610
540
770
4,8
5,2
A B C D
415 205 250 300
425 205 285 385
90 70 720 1000 5,6 445 205 345 475

TYPE
ISI-ARCUT 15/5
ISI-ARCUT 24/5
ISI-ARCUT 36/5
ISI-ARCUT 15/10
ISI-ARCUT 24/10
ISI-ARCUT 36/10
RATED
VOLTAGE
15
24
36
15
24
36
KV
BIL
125
150
190
125
150
190
KA
5
5
5
10
10
10
ARRESTER
TYPE
ISI-EGA 15
ISI-EGB 24
ISI-EGC 36
ISI-HEA 15
ISI-HEB 24
ISI-HEC 36
MCOV
KV rms
12
19.2
28.8
12
19.2
28.8
LEAKAGE distance mm
400
620
1040
400
620
1040
WEIGHT
Kg
2.1
2.1
2.1
2.1
2.1
2.1