文档介绍：ANSI/IEEE Std 400-1980
(Reaffirmed 1987)
(Reaffirmed 1988)
IEEE Guide for Making
High-Direct-Voltage Tests on
Power Cable Systems in the Field
Published by The Institute of Electrical and Electronics Engineers, Inc 345 East 47th Street, New York, NY 10017, USA
October 28-I980 SH07914
An American National Standard
IEEE Guide for Making High-Direct-Voltage
Tests on Power Cable Systems in the Field
1. Introduction type, but varying between types of insulation.
The establishment of such a ratio lacks scien-
tific basis and many engineers believe that the
Need for Testing. While cable is intensely direct test voltage should be related to the ulti-
tested by the manufacturer before shipment, mate dielectric strength of the insulation.
it may be subject to damage or improper Experience has shown that the application of
treatment in shipment or installation. Con- high direct voltage deteriorates sound insula-
sequently, further testing pleted in- tion very slowly, if at all, so the duration of the
stallations before being placed in service is direct voltage test is not highly important.
widely practiced. Additionally, many users Since the direct voltage strength of cable in-
find that with time alternating voltage will sulation approaches the impulse strength, it is
cause deterioration or defects or reveal damage logical