Megger MGTR-II GPS Timing Reference

Megger MGTR-II GPS Timing Reference

The Megger MGTR-II is a small, lightweight, field-portable GPS satellite receiver built to perform end-to-end tests of line-protection schemes together with Megger SMRT, MPRT and PULSAR relay test systems. It generates a precise programmed output pulse (POP) with 100 ns of resolution, giving test teams at both ends of a line a common, satellite-locked time reference so tripping and communication times can be measured accurately across substations. A 12-channel receiver reaches 100 ns timing accuracy within minutes of start-up and holds near-rubidium stability if the GPS signal is briefly lost, making it dependable for demanding field protection testing.

The Megger MGTR-II is for protection engineers and commissioning teams who run end-to-end tests on line differential, distance and pilot schemes, where the relay test set at each substation must apply its fault at the same instant. One MGTR-II at each end, programmed with the same output pulse, triggers the SMRT, MPRT or PULSAR test sets within 1 µs of UTC, even when the terminals are a hundred miles apart. Megger also lists the IRIG-B output for time-stamping IEC 61850 sampled values and for testing phasor measurement units (PMU), and IRIG-B or 1 PPS for synchronising test sets that accept an external time signal.

From Megger’s MGTR-II datasheet: the programmed output pulse is set by date, time, repetition, polarity and width (1 µs to 250 ms) with 100 ns resolution and 100 ns RMS accuracy, TTL into 50 Ω. IRIG-B comes in B007 and B002 formats. The event time tag input marks external events with 100 ns resolution and buffers several of them. The 12-channel L1 C/A receiver drives a GPS-disciplined ovenized crystal oscillator. Time to first fix is under 30 s hot, under 60 s warm, and typically under 3 minutes cold (12.5 minutes max). Long-term accuracy is 1 × 10⁻¹² after 24 h of tracking and stability while coasting is 7 × 10⁻¹⁰ s/s, which is what Intelligent Holdover relies on near buildings or terrain that block the sky. A visual alarm shows when the unit cannot supply corrected time. The unit measures 104.8 × 38.1 × 101.6 mm, weighs 0.383 kg, runs from a 100-240 V AC adapter (24 V DC), operates from −20 to 70 °C and meets IEC 61010-1.

Order codes: MGTR-II-50 with a 50 ft (15.15 m) antenna cable, or MGTR-II-100 with 100 ft (30.3 m). An optional soft transit case (MC6674) has pockets for the antenna, cables and power supply.

MME is an authorized Megger representative in the UAE. See the Megger range and our relay and protection testing range. SMRT test sets it triggers include the Megger SMRT46, the Megger SMRT410D and the Megger SMRT1; for touch-screen control of an SMRT, see the Megger STVI-10. The MGTR-II datasheet (PDF)PDF has the full specification.

Key features of the Megger MGTR-II GPS timing reference

What the MGTR-II brings to an end-to-end test:

• 100 ns programmed output pulse (POP) – programmable trigger pulse with 100 ns resolution synchronises relay test sets at both ends of a line for true end-to-end testing.
• 12-channel GPS timing receiver – tracks all available satellites and reaches 100 ns accuracy within minutes of start-up, synchronised to better than ±1 µs of UTC.
• Near-rubidium holdover – maintains near-rubidium timing stability during temporary loss of the GPS signal, so tests stay valid in weak-signal locations.
• Multiple time outputs – 1 pulse-per-second (PPS), IRIG-B time code, ASCII serial time message and external event time-tag support a wide range of schemes.
• Works with Megger relay test systems – designed for use with Megger SMRT, MPRT and PULSAR relay and protection test sets.
• RS-232 interface and Windows software – standard serial connection with Windows-based control software for simple set-up and programming.
• High-performance antenna – all-weather, high-noise-immunity antenna with integrated low-noise preamplifier and a 15.2 m (50 ft) cable for flexible placement.

Megger MGTR-II GPS timing reference applications

Where the MGTR-II is used:

• End-to-end testing of line current-differential and distance protection schemes across substations.
• Verifying communication-assisted tripping and pilot protection timing.
• Time-synchronised event tagging for protection commissioning and maintenance.
• Field relay testing with Megger SMRT, MPRT and PULSAR test systems.

What’s in the box – Megger MGTR-II timing reference

What comes with the MGTR-II:

• MGTR-II GPS timing reference unit
• All-weather GPS antenna with integrated low-noise preamplifier
• 15.2 m (50 ft) antenna cable (30.3 m / 100 ft with order code MGTR-II-100)
• 4 inch antenna mount
• Instruction manual and Windows-based MGTR control software on CD (83289)
• AC/DC power adapter (561024), 3 ft BNC coax cable (620121) and BNC to banana adapter (90003-671)

Exact kit contents can vary by order; confirm with MME when purchasing.

Megger MGTR-II questions

What protection teams ask before ordering:

• How many units do I need? One at each line end. Each unit triggers the test set at its own substation from the same programmed time.
• What if GPS drops out during a test? Intelligent Holdover keeps near-rubidium timing through temporary signal loss, and a visual alarm shows when the unit can no longer give corrected time.
• How is it controlled? Over RS-232 (a USB to RS-232 adapter on a laptop) with Megger’s MGTR control software, version 2.1, which works with both the MGTR and the MGTR-II.

Why buy the Megger MGTR-II from MME in UAE

MOHAMMAD MAHDI Electronics Trading LLC (MME) supplies genuine Megger test and measurement equipment across the UAE and the wider GCC, with knowledgeable application support, calibration guidance and after-sales service. Contact MME for pricing, availability and the right MGTR-II configuration for your protection-testing needs.