Description
Megger FREJA 400 Relay Tester Repair
The FREJA 400 pairs a powerful three-phase current/voltage source with the FREJA Win software platform for advanced, computer-driven protection testing — distance, differential, and complex multi-shot schemes. It’s a software-and-amplifier instrument, so its faults split between the high-power output side and the PC-interface side.
June Company repairs and calibrates the FREJA 400 for protection engineers running automated test plans on modern numerical relays.
Common FREJA 400 problems we fix
- A current or voltage channel down — amplifier output-stage failure; we repair the affected module and verify all three phases against rated output.
- Won’t connect to FREJA Win — the FREJA 400 is driven from the PC, so a USB/Ethernet interface fault effectively bricks it for automated testing. We restore reliable communication.
- Generated waveform distorted — D/A or output-regulation degradation that corrupts the test waveform, repaired for clean three-phase output.
- Timing/sync errors — internal timing-reference faults affecting trip-time and end-to-end results.
- Output trips under burden — protection or thermal faults that shut a channel down during high-current tests.
FAQs
My FREJA won’t talk to the software — fixable? Yes. Since the FREJA 400 runs from FREJA Win, the PC interface is essential; we repair the USB/Ethernet hardware and confirm full software control.
Do you verify all three phases? Yes — every channel’s voltage and current accuracy is checked against our standards, returned with NIST-traceable calibration.
Every repair includes NIST-traceable calibration and a 90-day parts-and-labor warranty. Email us or submit a service request.





