3
Association of Edison Illuminating Companies (AEIC) CS 5-94, "Specifications for Cross-
Linked Polyethylene Insulated Shielded Power Cables Rated 5 through 46 kV," paragraph L-2.
13
Maintenance or Test
Recommended Interval
Reference
Dielectric loss
5 years
Doble M2H Instruction Manual
Infrared scan
Annually
NFPA 70B, 18-17
High voltage cable conducts power between the powerplant and switchyard. The
cable may be solid dielectric or oil-filled. In the case of critical circuits, periodic
maintenance tests are justified during the life of the cable to determine whether or not
there has been significant insulation deterioration due to operational or environmental
conditions.
cable may be solid dielectric or oil-filled. In the case of critical circuits, periodic
maintenance tests are justified during the life of the cable to determine whether or not
there has been significant insulation deterioration due to operational or environmental
conditions.
Direct current (DC) high potential tests effectively reduce in-service failures from
faults of the cable or its accessories. When done properly, maintenance tests can
detect cables that are approaching failure without accelerating the deterioration
process. However, the insulated conductor industry has determined that DC testing of
crosslinked polyethylene (XLPE) insulation systems after the initial 5 years is
detrimental to the life of the insulation.
faults of the cable or its accessories. When done properly, maintenance tests can
detect cables that are approaching failure without accelerating the deterioration
process. However, the insulated conductor industry has determined that DC testing of
crosslinked polyethylene (XLPE) insulation systems after the initial 5 years is
detrimental to the life of the insulation.
3
Therefore, periodic direct-current
maintenance tests are not recommended for XLPE cables. Other types of cable
insulation are not subject to the same aging characteristics and, therefore, can be
tested in accordance with manufacturer's recommendations and industry standards.
insulation are not subject to the same aging characteristics and, therefore, can be
tested in accordance with manufacturer's recommendations and industry standards.
Except for infrared scanning, de-energize the cable circuit before maintenance. For
assistance in determining appropriate test methods and voltage levels for a specific
cable installation, please contact D-8450 at (303) 445-2300.
assistance in determining appropriate test methods and voltage levels for a specific
cable installation, please contact D-8450 at (303) 445-2300.