Megger VLF SIN-45 - Page 46

Operating Modes
46
EPR cables by their nature exhibit a higher dielectric loss factor as compared to
PE-based cables. However, this is still below the level of PILC cables.
The limits specified in the following table are to be regarded only as guide values only:
Mean value
at Uo
[10
-3
]
σ at Uo
[10
-3
]
Δtanδ
(1.5Uo – 0.5Uo)
[10
-3
]
Condition assessment
<35 and <0.1 and <5 No action required
35 to 120 or 0.1 to 1.3 or 5 to 100 Further study advised
>120 or >1.3 or >100 Action required
A more detailed breakdown of the different material compositions of EPR insulation, can
be found in the IEEE 400.2 standard.
Evaluation of EPR
cables