Partial discharges (PD) are evidence of a degrading insulation system, which could lead to very costly repairs and can predicatively lead to an electrical breakdown of high voltage apparatus. The phenomenon is of great practical interest in the electric power industry, as the presence and magnitude of PD are important criteria to measure for the early detection of degrading insulation quality and the assessment of manufactured, installed, or repaired product quality. One of the most difficult tasks is interpreting the PD data and determining the time an insulation system may remain in service before damaging and costly failure can occur.
We use GDPD-505 Portable Partial Discharge Detector from HV HIPOT Electric Co. Ltd. to test partial discharge of cable.
GDPD-505 is a portable multi-functional PD online detector, which is suitable for transformers and GIS.
The system includes special UHF sensors, 40kHz ultrasonic sensor, HFCT(high frequency current transformer) for GIS, special 150kHz ultrasonic sensor and HFCT for power transformers.
It uses pulse current, ultrasonic and UHF technology, to detect and analyze HF electromagnetic signals and ultrasonic signals of internal transformers and GIS, so that to detect and evaluate the running status ofGIS, transformers.
Features of GDPD-505
- The main detector is portable design, robust and reliable.
- Using 14 inch laptop, built-in 20 Ah Li-battery. Working up to 4 hours without external power supply.
- Strong anti-interference ability. Using digital filtering technology, effectively eliminate field interference.
- Multi-channel data collection. Comprehensive analysis of electromagnetic wave and ultrasonic wave generated by partial discharge.
- Easy wiring. BNC port for sensors and detector.
- Strong software functions. With PD measurement and analysis, Measurement and analysis of PD repeat discharge times “n”, anti-fixed interference, anti-dynamic interference, display mode of ellipse, straight line and sine wave can be selected.
- The discharge result is accorded with IEC60720 standard. The display value unit is pc and mV.
