LID – UPD – SUBSTATION
Introduction： PD is an electrical discharge that occurs across a localized area of the insulation between two conducting electrodes, without completely bridging the gap (see IEC 60270). It can be caused by discontinuities or imperfections in the insulation system. PD activity is an indication of an incipient medium voltage (MV) or high voltage (HV) insulation fault and is widely regarded as the best early warning indicator of electrical insulation deterioration in MV and HV electrical assets
Partial Discharge： ： Partial Discharge testing and monitoring is particularly important when the medium or high voltage asset is critical to the operation of a network; this may be due to the asset’s age, limited network redundancy, past failures or the financial consequences of a failure. Examples of MV and HV plant that can be tested/monitored include:
- Cables and cable accessories (terminations, joints, sealing ends)
- Switchgear (AIS, SIS & GIS)
- Power Transformers and Bushings
- Transformers (Oil Filled & Dry Type)
- Instrument Transformers (Voltage & Current)
- Capacitors
Features
- Online, non-invasive condition test kit
- Test and identify weak insulation in substation assets.
- Innovative equipment to test - Transformers, CT, PT, CVT, Breakers etc.
- Big size flexible CT is adequate to measure leakage current on strips and structures.
- Higher leakage current in assets is follwed by identification of PD by using TEV, HFCT & Acoustic Sensors.
- Accurate analysis software is provided with laptop.
- Comparison of historical data is facilitated.
Technical Specifications
- TEV Sensor
- Measurement Range (Peak) 0 – 70 dBmV
- Measurement Range
- (Cumulative Activity) 0 – 350,000 mV/cycle
- Frequency Response 5 – 60 MHz
- Resolution 1 dB
- Accuracy ±1 dB
- HFCT Sensor
- Measurement Range
- (HFCT 100/50, Ztr=3.9) 200 pC/cycle – 20,000 nC/cycle
- Frequency Response(-3 dB response) 100 kHz – 20 MHz
- Resolution 1 dB
- Accuracy ±1 dB
- Flexible CT Leakage Current Tester
- Flexible Split-Core within built shielding
- AC & DC Leakage/Line Current
- Single CT with Dual Integration Mode
- AC & DC 3A/30A/300A/3000A (AC50/60 Hz & DC)
- ±3% of reading
