Description
Megger NTS-300A Network Relay Tester Repair
The NTS-300A is a specialized network/pilot-protection relay tester — built for the timing-critical, multi-ended schemes where two or more relays coordinate across a communications channel. Its value is in precise phase and timing control, so its faults tend to show up as accuracy and synchronization problems rather than brute-force amplifier failures.
June Company repairs and calibrates the NTS-300A for protection crews testing pilot and network relay schemes.
Common NTS-300A problems we fix
- Phase angle accuracy errors — the most common NTS-300A complaint, and critical for network schemes where phase relationships decide trip/no-trip. We recalibrate the phase reference to specification.
- Timing/sync drift — reference-clock degradation affecting coordinated multi-ended timing tests.
- Output channel weak — amplifier-stage wear, repaired so voltage and current meet rated values.
- Communication/interface faults — control and data connections to the test PC.
- Erratic control behavior — control-board component aging.
FAQs
My phase readings are off — is that repairable? Yes, and it’s the signature NTS-300A repair. Phase-reference drift undermines network-scheme testing; we recalibrate it against our standards so phase accuracy is restored.
Can you verify timing for pilot schemes? Yes — timing and synchronization are checked and certified with NIST-traceable results.
Every repair includes NIST-traceable calibration and a 90-day parts-and-labor warranty. Email us or submit a service request.
