For decades, as a main porcelain line post insulator, ANSI 57-2 insulator has demonstrated reliable performance in various types of transmission and distribution applications all over the world.
NSI 57-2 insulator is horizontal porcelain line post used for applications such as down-leads and jumper loop control and is Horizontal Mounting Clamp-Top Type with Stud Base (2" Trunnion bolt and Locknut). It is manufactured and tested to ANSI Standard C29.7.
ANSI 57-2 insulator parameters:
Type | 57-2 | ||
Power frequency flashover voltage | Dry | KV | 100 |
Wet | KV | 70 | |
Critical impulse flashover voltage | KV | 160 | |
Radio interference voltage | Test voltage to ground | KV | 22 |
Max. RIV at 1 MHz | μV | 100 | |
Leakage distance | Inches | 22 | |
Dry arcing distance | Inches | 9.5 | |
Cantilever strength | Pounds | 2800 |
Gray glaze is supplied on all standard strength porcelain line post insulators unless otherwise specified. Pre-assembled line posts have top and bottom sections permanently joined with a metal flange or collar in place of the end caps used on the standard bolted assembly. Much of the rural distribution presently employing Orient distribution ANSI 57-2 insulator is of the unshielded type utilizing pole top bracket and crossarm mounting of insulators.
Tests performed with a small bullet demonstrated that the bullets that struck in the outer casing did not damage the Porcelain – composite or glass insulators - taken by comparison - exploded completely as soon as they are struck.
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