Transformer Polarity Checker (865)
TESCO’s Transformer Polarity Checker (865) offers utilities and technicians a simple, accurate method to verify polarity markings on transformers of all sizes. Whether testing electronic, metering, or large power transformers, this tool helps ensure installations are properly wired and compliant.
During use, a momentary DC current is applied through one transformer winding. The induced voltage in the opposite winding causes the analog meter to deflect, providing an immediate indication of correct or reversed polarity.
With a built-in sensitivity control, the 865 adapts to transformers of varying current capacities and is also an ideal tool for troubleshooting transformer-rated meter installations. Its center-zero meter, ease of operation, and rugged build make it a trusted tool in the field.
Description
A reliable tool for verifying polarity markings and wiring accuracy in transformer installations.
Key Features
- Verifies polarity markings on all transformer types
- Works on instrument, power, potential, and current transformers
- Sensitivity control adjusts for different transformer sizes
- Simple operation using a push-button test
- Center-zero analog meter for clear directional readings
- Battery-powered using a single D-cell (quick replacement)
- No calibration required
- Compact and portable for field use
Applications
- Confirm polarity on transformer terminals
- Detect reversed wiring in transformer-rated meter installations
- Verify meter test switch connections
- Check instrument transformer installations (CTs and PTs)
Specifications
| Parameter | Value |
|---|---|
| Power | One D-size dry cell |
| Dimensions | 3.75″ x 6.25″ x 2.75″ |
| Weight | 1.6 lbs |
| Display | Center-zero analog meter |
| Adjustment | Sensitivity dial for current tuning |
| Operation | Push-button DC test trigger |
