Test Van

Mobile Diagnostic Off-line Cable Test Services

Using the HVPD Test Van we can deliver the most sophisticated diagnostic off-line test equipment and services across the UK. We can quickly mobilise to your site to detect and locate faults in MV/HV/EHV cables rated up to 400 kV.
Our services are suitable for all types of power cables, including underground and subsea, with testing being conducted before commissioning, as part of routine condition monitoring, and as part of scheduled or unplanned outages.
We can accurately detect and locate cable faults according to customer's specifications or recognised standards (e.g. IEEE Standard 400.2 for VLF testing).

Test Capabilities

Partial Discharge and Tan Delta

  • PD testing using a sinusoidal 0.1 Hz VLF voltage, adjustable over a range of <90 kV peak (in accordance with IEC 60270)

  • Measurement of the intensity of PD versus time

  • PD mapping shows the cable defects and location

  • Integrated TD diagnostics indicates degradation of the insulation by measuring changes in the loss angle of the cable

  • Localisation of faults by TDR (Time Domain Reflectometry)

  • Also suitable for testing of capacitors, switchgear, transformers and rotating machines (IEEE 433)

Testing, Pre location and Pinpointing of Sheath Faults

  • Test voltage up to ±10 kV DC

  • Up to 750 mA continuous current, also suitable for burning

  • Bipolar pre-location supports the detection of galvanic and thermoelectric influences and increases the pre-location accuracy and quality

  • Precise location of high- and low-resistance, as well as intermittent, faults using an echo meter

  • Combined acoustic and electromagnetic pinpoint location

  • Suitable for low and medium voltage networks for locating faults on cables

  • Burn down transformer is used to decrease the impedance of cable faults in LV and MV cable networks: max voltage of 10 kV

Very Low Frequency Cable Testing

  • 0.1 Hz VLF cable testing

  • Maximum output voltage cables with a length of up to 50 km can be tested.

  • Cable sheath/jacket testing

  • Sheath fault location

  • Vacuum bottle test

  • Cable fault conditioning (burning)

Time Domain Reflectometry

  • Fault location in power cables with a length up to 1000 km

  • Location of low resistance faults and interruptions in cables

  • Pre-location of high resistance and intermittent faults with shock discharge generator and an ARM (Arc Reflection Method) filter

  • Conditioning faults can be done by short-term burning in all voltage levels

Optical Time Domain Reflectometry

  • Fibre testing OTDR

  • Fault finding

  • Monitoring

  • Testing and proving