High-frequency partial discharge sensors are critical devices for detecting internal insulation defects in power equipment. Their working principle is based on electromagnetic coupling, where high-frequency current transformers (HFCT) couple nanosecond-level pulse current signals from cable grounding wires or equipment terminal screens. When partial discharges occur within the insulation, they generate extremely fast-rising (1-5 nanoseconds) current pulses containing rich high-frequency components in the 300kHz-30MHz range. The sensor converts these high-frequency signals into measurable voltage signals for acquisition and analysis through magnetic core coupling.
Product Features
1. High Sensitivity and Strong Anti-Interference Capability: By capturing high-frequency signals below 30MHz, they effectively avoid interference from conventional power system low-frequency noise, enabling detection of pico-coulomb level weak discharges.
2. Wide-Band Response Characteristics: With a 3dB bandwidth of 300kHz-30MHz, they can fully capture the complete waveform characteristics of partial discharge pulses.
3. Non-Intrusive Online Monitoring: The clamp-on structure is installed in the grounding loop without altering the main equipment wiring, enabling real-time monitoring while the equipment remains energized.
Common Applications
1. Partial discharge monitoring in power cables: Installed at cable terminal grounding wires.
2. GIS/HV switchgear monitoring: Coupling signals from disconnector switch grounding wires.
3. Transformer bushing and winding monitoring: Detecting signals through bushing tap grounding wires.
4. New energy plant monitoring: Applied to key equipment in wind and solar power step-up stations.
