Post Insulator Leakage Current Sensor

Post Insulator Leakage Current Sensor

Project Summary

This project is developing an RF sensor that is installed at the base of either substation or transmission line post-type insulators. The leakage currents are continuously measured and stored in histograms or reported real-time for analysis. Applications include:

  • Improving washing schedules
  • Understanding the contamination environment for dimensioning of insulators
  • Understanding the rate of aging

Project Status

Project Phase: Demonstration

Three demonstration sites are in-service with more than three years experience at one test site where 30 sensors are installed to investigate road-salt contamination. Two new test sites are being planned to addressed pole fires. A solar powered base station has been developed, which can collect the data from tens of sensors, record weather parameters, and transmit the data to a central server.

Research is underway to develop improved algorithms to identify when washing is necessary or a high risk condition is occurring. Full-scale laboratory tests have been completed at 138kV and 345kV for porcelain, RTV coated, and resistive glaze post insulators. Continual improvement in the post insulator leakage current sensor is underway. Areas of improvement include increasing security of RF transmission, lowering the current required for power harvesting, refinement of algorithms, improvement in reliability, and manufacturability.

Task Descriptions

Task Due Date Completed % Complete
Develop algorithms to identify when to wash insulators 8/2011 80%

Videos

Sensor Components Animation
Sensor Components Animation
Sensor Installation Animation
Sensor Installation Animation

Images

Demonstration Site Map
Demonstration Site Map
Testing Site Photo
Testing Site Photo
Sensor Test Photo
Sensor Test Photo