Partial Discharge Sensors

 A coupling capacitor sensor (CC) detects partial discharge by capturing high-frequency voltage pulses coupled from the high-voltage conductor. It enables  PD monitoring in medium cables, switchgear, and rotating machines.

 A High-Frequency Current Transformer (HFCT) sensor detects partial discharge by capturing high-frequency current pulses on grounding conductors. It enables non-intrusive PD monitoring in cables, switchgear, and rotating machines. HFCTs are easy to install and ideal for both online and offline diagnostics. 

 A Transient Earth Voltage (TEV) sensor detects partial discharge by sensing high-frequency voltage transients on the surface of metal-clad switchgear. It is a non-intrusive, contact-based sensor ideal for quick screening of PD. TEV sensors are widely used for condition assessment of medium-voltage switchgear. 

 An acoustic sensor detects partial discharge by capturing ultrasonic sound waves emitted during insulation breakdown. It is effective for detecting PD in oil-filled transformers, cable joints, and enclosed equipment. Acoustic sensors are non-invasive and useful in environments where electromagnetic signals are attenuated. 

 A bushing sensor monitors partial discharge activity within transformer bushings by detecting high-frequency electrical signals. It is typically mounted at the capacitive test tap or grounding shield of the bushing. Bushing sensors enable early detection of insulation defects, helping prevent catastrophic bushing failures. 

 An internal sensor for Transformer is a built-in UHF antenna designed to detect partial discharge signals from within the Transformer tank. Installed during manufacturing or retrofitted, it captures high-frequency EM emissions directly from the source. Internal sensors provide reliable, high-sensitivity PD detection with minimal external interference. 

 A window sensor for Transformer is a built-in UHF antenna designed to detect partial discharge signals from within the transformer tank. Installed during manufacturing or retrofitted at dielectric windows, it captures high-frequency EM emissions directly from the source. Window sensors provide reliable, high-sensitivity PD detection with minimal external interference. 

 A drain valve sensor is a UHF sensor mounted at the transformer’s oil drain valve to detect partial discharge activity inside the tank. It captures high-frequency electromagnetic signals through the metallic structure without opening the transformer. This non-intrusive sensor enables online PD monitoring in oil-filled power transformers.