• Highly Sensitive, Wide band, UHF PD Sensors for Transformers
  • Rugged design, 100% Leak proof
  • Easy to Install, Integrated Transient (Over-voltage) Protection
  • High Dielectric, shielded to avoid electromagnetic interface
  • Suitable for extreme environment, Outdoor Substation
  • Customized according to Transformer tank size & inspection covers

Rugged design, highly sensitive and accurate Partial Discharge sensor for detecting and monitoring partial discharge activity inside Oil Filled and Dry Type Transformers/Reactors.USENS-T is an Ultra High Frequency (UHF) antenna that can measure Electromagnetic PD signals from the inside of transformer.

The sensors are IP68 rated, easy to install on transformer tank and suitable for all types of Transformers. The sensors can easily be bolted on transformer tank (or inspection cover) directly touching the oil or with dielectric window in-between the sensor and oil. Higher sensitivity (up to -90dBm) over wide range of frequencies (200 – 3000 MHz) helps in reducing the cost of PD monitoring, hence higher ROI (Return on Investment).

  • Higher sensitivity (-90dBm); detect even smallest PD activity
  • Wider frequency response, compatible with all PDM systems
  • High Dielectric Strength, Safest installation and operation
  • Shielded Sensor, Lower Signal-to-Noise Ratio
  • Integrated overvoltage protection, for the safety of PDM electronics
  • Rugged design, IP68 Protection, Longer life
  • 100% leak proof sensor
  • Customizable according to the customer requirements
  • Power Transformer PD Testing and Monitoring
  • Reactor PD Testing and Monitoring
  • Distribution Transformer PD Testing and Monitoring
  • Continuous Online Partial Discharge Monitoring
  • Periodic Partial Discharge Testing and Measurements
  • High Voltage Testing during Commissioning
UHF Frequency Response
200 - 3000 MHz
up to -90 dBm
Average Effective Height over 500MHz – 1500MhHz
25 mm+
Min. Effective Height over 500Mhz – 1500Mhz
6 mm+
Withstand Voltage
up to 1500 kV
N-Type connector; Customized option available
Connector Circuit Impedance
50 Ω
Oil Pressure
up to 10bar
Vacuum Tightness
< 0.10 mbar, Leakage rate < 0.0001 mbar/sec
Vibration Testing
Suitable for HV - GIS and Transformer applications
Ingress Protection (IP)
Ambient (Operating Temperature)
-60 °C to +150 °C
Storage Temperature
-60 °C to +150 °C
Operating Humidity
95% humidity at 50 °C
Customized as per Transformer Flange Design
app. 1.5 KG; Customized as per customer requirements / Transformer Design
Install Position
Transformer Tank, Inspection Cover, Transformer Dielectric Window
Signal Cable
Very low attenuation UHF (Coax) cable