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Sediver Catalog 1970 52 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 |
|
Power frequency flashover: kV |
50% Impulse flashover
1.5 × 40 µ wave: kV |
| dry |
wet |
positive |
negative |
dry |
wet |
positive |
negative |
dry |
wet |
positive |
negative |
| Disc. Ø × spacing |
280 × 146 mm - 11" × 5¾" |
280 × 160 mm - 11" × 6¼" |
280 × 170 mm - 11" × 6 11/16" |
| 1 |
80 |
50 |
110 |
115 |
80 |
50 |
115 |
120 |
80 |
50 |
120 |
125 |
| 2 |
140 |
80 |
220 |
230 |
140 |
85 |
230 |
230 |
140 |
85 |
235 |
230 |
| 3 |
195 |
120 |
320 |
310 |
195 |
120 |
325 |
310 |
200 |
120 |
330 |
315 |
| 4 |
250 |
155 |
400 |
380 |
250 |
160 |
405 |
385 |
260 |
160 |
415 |
400 |
| 5 |
295 |
195 |
480 |
455 |
300 |
200 |
480 |
460 |
310 |
205 |
500 |
485 |
| 6 |
350 |
235 |
560 |
535 |
350 |
240 |
560 |
545 |
365 |
245 |
590 |
575 |
| 7 |
400 |
270 |
635 |
615 |
400 |
280 |
640 |
625 |
415 |
285 |
680 |
665 |
| 8 |
450 |
310 |
710 |
695 |
450 |
320 |
720 |
705 |
470 |
325 |
755 |
745 |
| 9 |
500 |
345 |
790 |
775 |
500 |
355 |
795 |
780 |
515 |
360 |
840 |
830 |
| 10 |
545 |
380 |
865 |
850 |
550 |
395 |
870 |
865 |
570 |
400 |
925 |
920 |
| 11 |
590 |
415 |
935 |
930 |
595 |
430 |
945 |
950 |
615 |
435 |
1000 |
1000 |
| 12 |
635 |
455 |
1010 |
1010 |
640 |
465 |
1025 |
1030 |
660 |
470 |
1085 |
1090 |
| 13 |
675 |
490 |
1085 |
1090 |
685 |
495 |
1100 |
1110 |
710 |
500 |
1165 |
1170 |
| 14 |
720 |
525 |
1160 |
1165 |
730 |
530 |
1175 |
1190 |
755 |
540 |
1250 |
1260 |
| 15 |
765 |
560 |
1230 |
1245 |
775 |
565 |
1250 |
1270 |
800 |
575 |
1330 |
1340 |
| 16 |
805 |
590 |
1300 |
1315 |
815 |
600 |
1325 |
1350 |
840 |
610 |
1410 |
1425 |
| 17 |
850 |
625 |
1375 |
1395 |
855 |
635 |
1400 |
1430 |
880 |
645 |
1490 |
1510 |
| 18 |
890 |
655 |
1450 |
1480 |
895 |
670 |
1475 |
1510 |
920 |
680 |
1570 |
1600 |
| 19 |
930 |
690 |
1525 |
1555 |
935 |
700 |
1550 |
1590 |
960 |
715 |
1650 |
1680 |
| 20 |
970 |
725 |
1595 |
1630 |
975 |
735 |
1625 |
1670 |
1000 |
745 |
1730 |
1760 |
| 21 |
1010 |
760 |
1665 |
1705 |
1020 |
765 |
1695 |
1745 |
1040 |
775 |
1810 |
1850 |
| 22 |
1050 |
790 |
1740 |
1755 |
1060 |
800 |
1770 |
1820 |
1080 |
810 |
1885 |
1920 |
| 23 |
1090 |
825 |
1810 |
1860 |
1100 |
830 |
1840 |
1895 |
1120 |
840 |
1965 |
2000 |
| 24 |
1130 |
855 |
1880 |
1935 |
1140 |
865 |
1910 |
1970 |
1160 |
875 |
2045 |
2080 |
| 25 |
1170 |
885 |
1950 |
2010 |
1180 |
895 |
1980 |
2045 |
1200 |
905 |
2125 |
2160 |
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