Ageing of electric cables in light water reactors (LWRs) - Materials' Ageing and Degradation in Light Water Reactors - page 226

Table 6.1 Cable testing and diagnostic techniques

Cable testing technique Part of cable

evaluated

In-situ* Remote

testing

Non-
destructive

Applicable
to low- and
medium-voltage
cables

Visual/tactile (visual screening test) I,CN,P,S,T ᅚ No ᅚ ᅚ

Hi-Pot test (high voltage test may damage
insulation)

I No ᅚ No ᅚ

AgeAlert TM (wireless sensors attached to cables) I ᅚ ᅚ ᅚ ᅚ

TDR (time domain refl ectometry) I,C,CN,P,S,T ᅚ ᅚ ᅚ ᅚ

RTDR (reverse TDR for coaxial shielded cables) C,CN,P,S,T ᅚ ᅚ ᅚ ᅚ

Impedance measurements (inductance,
capacitance, and AC resistance)

C,T,CN,P,S,T ᅚ ᅚ ᅚ ᅚ

Partial discharge I,P,CN,S,T ᅚ No ᅚ ᅚ**

Insulation resistance (dielectric absorption ratio,
polarization index) (sustained higher DC voltage
resistance)

I,CN,P,S,T ᅚ ᅚ ᅚ ᅚ

Dissipation factor (Tan Delta) I,CN,P,S,T ᅚ ᅚ ᅚ ᅚ**

AC voltage withstand (low frequency, high voltage) I,CN,P,S,T ᅚ ᅚ ᅚ ᅚ**

DC step voltage I,C,CN,P,S,T ᅚ ᅚ ᅚ ᅚ**