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Phase Identification

PhaseTrakker® Jr+

Indoor or outdoor phasing from 0.5V to 500kV, and UG cable 50A to 600A

Available for the United States & Canada


  • Fast and Easy to Operate and Works Anywhere
  • Indoors or Outdoors
  • 0.5V to 500kV on Voltage
  • UG Cable - 50A to 600A on current
  • Acquires phase measurements with or without direct contact
  • Compares phase reading with reference unit to determine phase and phase angle
  • Simple A-phase calibration
  • Records can be stored on demand for areas outside cellular range


  • Phase indoors or outdoors, underground or overhead, for 0.5V to 500kV test points
  • Can phase  underground cable from 50A to 600A using current measurements
  • Test without de-energizing lines
  • Balance loads to minimize system loss
  • Reduce safety hazards and damage to equipment
  • Identify and mark correct phasing for system mapping
  • Ensure substations’ connections are phase correct

The purchase of every PhaseTrakker field unit includes free access to regional base Reference Units located across the United States and Canada.

Reference Units are available for companies that wish to purchase their own base units. For more information, contact your local product representative, or EDM.
(800) 687-4196    |    This email address is being protected from spambots. You need JavaScript enabled to view it.

reference unit rack
Phasetrakker AP30 reference unit portable
Phasetrakker AP30 reference unit portable

Available in camo and blue

Pricing & Ordering

Sam Jack

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Diane Hurst

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PhaseTrakker Jr+ Training Video


Why is accurate phase identification so important?
  • It’s common for underground cables to be mislabeled. This causes confusion during outages. Also, when two circuits need to be looped together, the labeling must be right. It’s inconvenient to de-energize a circuit to determine phasing. PhaseTrakker JR+ determines phasing on energized equipment.
  • Long over-head lines can easily have mislabeled or uncertain phasing. This can result in substation problems such as delays in construction.
  • When a utility wants to optimize load balance to reduce losses, it’s essential to know which phase is which, so loads can be transferred correctly.
  • If a protective relay or revenue meter is working incorrectly, it’s vital to know where the phasing got mixed up.
  • It’s common to have confused phasing through three-phase transformers. It’s important to determine the phasing to avoid trial-and-error transformer connections.
  • Besides the issues associated with load balance and system optimization, inaccurate phase labeling can result in equipment damage and injury of personnel.
Why not use “Phasing Sticks” instead?

A set of Phasing Sticks is really just a high-range voltmeter that will determine if two phases match or not. Phasing Sticks can determine if two like-labeled conductors are actually different phases, but PhaseTrakker JR+ is required to determine which one is labeled correctly.

Can PhaseTrakker JR+ determine phase rotation?

Yes. PhaseTrakker JR+ will display the phase angle of every voltage reading. This determines rotation.

Where can PhaseTrakker JR+ be used?

PhaseTrakker JR+ will determine the phase of any energized test point with at least 0.5V up to 500kV, indoors or outdoors.
Will also determine phase on underground cable from 50A to 600A using current measurements.

  • Bare buswork as in substations
  • Bare conductors such as distribution or transmission lines
  • Taped buswork as used in switchgear
  • Test points on 200A cable elbows
  • Test points on 600A cable elbows
  • Insulated bolts on the back of 600A T-body elbows
  • Recloser controls
  • Substation relays
  • 120V household outlet
  • Wrapped underground cable from 50A to 600A
What’s the maximum distance between the Reference and Field Unit?

Measurements have been routinely taken with a distance of 800 miles between the Reference and Field Units. At this distance it is common to get some seasonal power angle shift across the power grid, so it’s a good idea to verify occasionally on a known phase before checking unknown equipment. This power angle shift should be insignificant at the more normal maximum distances, say in the 300 mile range.

What are the basics of how PhaseTrakker JR+ system works?

The Reference Unit takes a reading every second of the degrees to the next voltage sine wave zero crossing. When a Field Unit calls in, the Field Unit compares the local angle measurement to the cataloged value for that matching second. Since the GPS time is precisely the same at each location and since the phase “A” voltage is in phase at each location, the angle comparison determines how many degrees the Field Unit voltage is away from the Reference Unit, which then determines the phase identification as well.

What factors make PhaseTrakker JR+ a superior product in the marketplace?
  • PhaseTrakker JR+ provides instantaneous absolute phase and phase angle identification, anywhere on an overhead or underground transmission or distribution system, (where live contact is possible.)
  • With each purchase, the PhaseTrakker JR+ unit includes a free year of cellular service.
  • In areas where no cellular service is available, PhaseTrakker JR+ can still record up to 1000 phase readings over a period of 30 days, which can be retrieved when cell signal is re-acquired. The system is configured to allow transferring the phase data to a laptop for use with mapping systems and databases.
  • PhaseTrakker JR+ is portable, durable, and can be used independently from the work vehicle.
  • PhaseTrakker JR+ features an easy to read LCD screen, and all calibration functions can easily be performed via convenient touch-screen process. Phase readings can be instantly shifted to adjust for Delta-Wye transformers.
  • PhaseTrakker JR+ can be calibrated to communicate with 2 Reference units at different locations. As long as the Field Unit and Reference Unit are located on the same power grid, (regardless of distance,) phase identification can be achieved.

United States Representatives

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Canada Representatives

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