Off-line Testing

Diagnostic Off-line PD Testing

HVPD's off‑line diagnostic partial discharge (PD) tests can detect any insulation problems with cable/plant equipment at the acceptance/commissioning stage, before it is put into service. Routine off‑line maintenance tests can also be performed to assess plant insulation condition during planned maintenance outages. 
 
We now offer Mobile Diagnostic Off-line Cable and Plant Test Services for insulation condition assessment of out of service plant and cables. 
 

Field Testing

  • Very Low Frequency (VLF) PD & TD testing up to 90 kV
  • On‑site commissioning tests including 24‑hour IEC soak‑tests
  • 50/60 Hz withstand testing with PD testing
  • Time‑domain reflectometry (TDR) fingerprinting of cables (up to 300 km)
  • Insulation resistance (IR) testing with polarisation index (PI) measurements.
 

Factory Testing

 

 
 
 

What Test to Choose

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50/60 Hz
VLF PD TD
IR
TDR
PD diagnostics
 
  
   
   
TD diagnostics
 
  
   
   
Withstand test
 
  
   
  
Cable fingerprinting
Use TDR
Use TDR
Use TDR
  
Soak test
 
  
   
   
PD mapping
 
  
   
  
Factory acceptance test
 
  
  
  
On-site commissioning
 
  
  
  
Routine testing during service life
 
  
  
  
Can be performed onshore & laboratory
 
  
  
  
Can be performed offshore
 
  
  
  
Maximum test voltage
100 kV AC
60 kV AC
10 kV DC

n/a

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Yes   No