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Sediver Catalog 1970 53 of 136
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string flashover values
standard string flashover values of suspension insulators based on the
test procedure of I.E.C. Publication 274 and B.S. No 137-1960
| No. of units. |
Power frequency flashover: kV |
50% Impulse flashover
1.5 × 40 µ wave: kV |
|
Power frequency flashover: kV |
50 ;Impulse flashover
1.5 × 40 µ wave: kV |
| dry |
wet |
positive |
negative |
dry |
wet |
positive |
negative |
| Disc. Ø × spacing |
280 × 180 mm - 11" × 7" |
320 × 195 mm - 12½" × 7 11/16" |
| 1 |
80 |
50 |
120 |
125 |
90 |
60 |
120 |
140 |
| 2 |
145 |
85 |
240 |
235 |
165 |
90 |
260 |
250 |
| 3 |
210 |
125 |
330 |
320 |
235 |
135 |
370 |
350 |
| 4 |
265 |
165 |
435 |
410 |
300 |
180 |
465 |
440 |
| 5 |
320 |
210 |
530 |
500 |
360 |
220 |
560 |
550 |
| 6 |
375 |
250 |
620 |
590 |
420 |
260 |
650 |
645 |
| 7 |
430 |
290 |
710 |
680 |
480 |
300 |
740 |
740 |
| 8 |
485 |
330 |
795 |
770 |
535 |
345 |
830 |
835 |
| 9 |
535 |
365 |
880 |
860 |
590 |
390 |
920 |
930 |
| 10 |
585 |
405 |
965 |
950 |
645 |
430 |
1010 |
1025 |
| 11 |
635 |
445 |
1050 |
1040 |
700 |
470 |
1100 |
1120 |
| 12 |
685 |
480 |
1135 |
1130 |
755 |
505 |
1190 |
1215 |
| 13 |
735 |
520 |
1220 |
1220 |
805 |
545 |
1280 |
1310 |
| 14 |
780 |
555 |
1305 |
1310 |
855 |
580 |
1370 |
1405 |
| 15 |
825 |
590 |
1390 |
1400 |
905 |
620 |
1460 |
1500 |
| 16 |
870 |
625 |
1475 |
1490 |
955 |
655 |
1550 |
1595 |
| 17 |
915 |
660 |
1560 |
1580 |
1005 |
695 |
1640 |
1690 |
| 18 |
960 |
690 |
1645 |
1670 |
1055 |
730 |
1730 |
1785 |
| 19 |
1005 |
725 |
1730 |
1760 |
1105 |
765 |
1820 |
1880 |
| 20 |
1050 |
755 |
1815 |
1850 |
1155 |
800 |
1910 |
1975 |
| 21 |
1095 |
790 |
1900 |
1940 |
1205 |
840 |
1995 |
2065 |
| 22 |
1140 |
820 |
1985 |
2030 |
1255 |
875 |
2080 |
2155 |
| 23 |
1185 |
855 |
2070 |
2110 |
1305 |
910 |
2165 |
2245 |
| 24 |
1230 |
885 |
2155 |
2200 |
1355 |
945 |
2250 |
2335 |
| 25 |
1275 |
920 |
2240 |
2290 |
1405 |
975 |
2335 |
2425 |
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