- Conductor examination : Number of wires / Diameter (in mm) maximum & minimum of measured values and requirements
- Conductor screen thickness measurement (in mm), maximum & minimum measured values and requirements
- Insulation Resistance(IR) in Mega Ohm (or MW/average) ,
- Wall thickness depends on rated voltage (U0) and insulation type according to IEC60502-2 (in mm) maximum & minimum measured values and requirements
- Insulation screen (in mm): wall thickness (in mm) maximum & minimum measured values and requirements and diameter
- Metal screen maximum & minimum measured values in mm and cross section in mm2.
- Hot set test defined in IEC 60811-507
- It is a mechanical-thermal test for polymetric insulation or sheath materials like XLPE, EPR, or PVC.
- A test piece of insulation (usually a strip) is cut.
- A specified load (0.2MPa for insulation, 0.15MPa for sheath) is applied.
- The sample is placed in an oven at 200°C (for XLPE) or specified temperature.
- The elongation and permanent deformation (set) after cooling are measured.
- The maximum elongation under load is measured.
- Pass criteria (typical for XLPE insulation):
- Elongation under load <= 175%
- Permanent elongation after cooling <= 15%
- High voltage test – IEC 60840 , Edition 5
- Partial discharge test (IEC/VDE) [kV]
- Voltage test (IEC/VDE) : Kv / 30min
- Electrical test on oversheath-DC test : kV / 1min
- Measurement of conductor Resistance (Ohm/km , 20°C)
- Measurement of screen Resistance (Ohm/km , 20°C)
- Measurement of Capacitance (mF/km)
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