KJ System

• Monitors HV cable local insulation condition
• Measures High Frequency PD pulses and store
• Maximum input channel : 30 : 10 feeders
• In-built Reflectometer algorithm pinpointing PD location to locate
  • Measures direct pulse and indirect pulse so that recognize flying time and calculate time General accuracy is 1%.

Expectation

• Prevents unplanned outage and breakdown
• Saves recovery expences
• Keeps the line online and reliability
• Unmanned operation and remote monitoring

How it works

• Monopolar pulses (shark fins)
• 200KHz ~ 4MHz
• Sizes typically within 100pC
  (bad for> 500pC for XLPE)

• KCM measures reads PD pattern pulses which is less then 1us event time, shark shaped and record as data. If device found direct and indirect pulse, TDM starts automatic location function and indicated PD location from testing point
• The expert system will tell PD is near ground, PD in insulation, Corona, PD near conductor, Surface dischage,

PD Location : TDR(Time-domain Reflectometry)

System Configuration