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Positron High Voltage Live Line Testers
For Porcelain & Polymeric Composite Insulators

Protect the Safety of Personnel and Prevent Costly Power Outages and Downed Power Lines

  • Safe to use: Does not make electrical contact with the lines or insulators
  • Proven electric field detection technology methodology
  • Does NOT rely on line of sight, heat (Infrared), corona discharge (Ultra Violet) or acoustics with limited reliability
  • 100% reliable to detect all conductive defects including early stage defects and contamination

Safe, Simple and Accurate

Defective suspension insulators flashover, severely compromised their mechanical integrity. This can result in prolonged power outages and downed power lines. Downed power transmission lines pose a serious threat to people and our environment.

The Positron Insulator Testers are revolutionary, easy-to-use lightweight tools that record defects and reveal dangerous conditions on energized suspension insulators, station posts, bushings, and lightning arresters. The Positron Insulator Testers sense and record the electric field distribution along the insulators, revealing all conductive insulator defects. The E-field Testers can be used on all types of insulators (Porcelain, Composite, Glass* for contamination assessment, etc.) and are safe, easy-to-use simple and produce inherently accurate results.

The operational integrity of high voltage insulators is a priority, particularly when you consider that a damaged, electrically deficient insulator can lead to system failure, serious injury, wildfires, or loss of life. Positron’s Insulator Testers are a major advance in ensuring suspension insulator integrity, allowing for the safe and reliable performance evaluation of critical high voltage insulators. Simply slide the Sled-mounted Tester along the polymeric composite insulator or porcelain insulator string, and the results are automatically processed and instantly viewable on the Tablet/Laptop pre-load with the Windows-based Insulator Tester Software.


Testing porcelaine insulators in towers

Testing Porcelain Insulators

Testing Composite Insulators in the dessert

Testing Polymeric Composite Insulator

Testing Post Insulators in Railways

Testing Post Insulators

Reliably used and validated by 50 major Power Utilities worldwide

  • Works with voltages up to 1,000 kV
  • Rugged and lightweight (less than 1.6 kg)
  • Available in 50 Hz and 60 Hz versions


Positron Live-Line
Insulator Testers
Application Chart

Product Porcelain Insulator Tester Composite Insulator Tester Substation Insulator Tester
Description (69 kV to 1,000 kV) (69 kV to 1,000 kV) (15 kV to 1,000 kV)
Model Numbers 3781301P/60 (60Hz)
3781301P/50 (50Hz)
3782091C/60 (60Hz)
3782091C/50 (50Hz)
3782652U/60 (60Hz)
3782652U/50 (50Hz)
Porcelain Transmission Insulator Strings
Porcelain Distribution Insulator Strings (3 discs min.)
Composite Transmission Insulators
Composite Distribution Insulators
Substation Hollow Post Insulators
Substation PT and CT Bushings
Lightning Arrestors
25 kV Railway Composite Insulators
25 kV Railway Porcelain Insulator Strings
Cable Terminations
Circuit Breaker Bushings



Insulator Tester Documents / Software
Insulator Tester Software Version 7.1.4 Download
PID Sales sheet
Insulator Tester Application Brochure
Insulator Tester Specification Brochure
Substation Insulator Tester
Composite Tester for Electric Railways
Mapping Software
Application Chart
Insulator Testers FAQ
High Voltage Insulator Testing-Technical Paper
Electric Field Distribution, Failure Detection, Maintenance and Safety
Related to Porcelain Insulators
Quick Start Guide - Porcelain and Composite Insulator Testers
Quick Start Guide - Universal Substation Insulator Tester
Insulator Tester Video Demonstration
Insulator Tester Field Demo Deployed with Helicopter and Bucket Truck helicopter glyphicon