• Stand-alone or remote-control operation
• Accurately measures ratio, phase deviation and excitation current
• Field upgradeable without compromise to calibration
• Built-in capability for storing and downloading test results in an XML format, via RS-232, Ethernet or USB ports (depending on model)
• Works in the presence of high interference/high voltage
• Highest ratio measurement (45,000:1); highest accuracy (0.1%)
• Displays % error vs. name plate with pass/fail limits

The TTR300 Series of three-phase transformer turns ratio test sets are designed to measure the turns ratio of power, instrument, and distribution transformers in a substation or manufacturing environment. A rugged and robust design makes these instruments well suited for use in a variety of harsh environments. Our leads are specially designed to provide the necessary flexibility needed in cold weather. 

The TTR300 Series are ideal for use by power transformer manufacturers. Their unique testing procedures and storage capability allows an operator to set up and test difficult three-phase transformers (with multiple tap changers and bushing CTs) in a fraction of the time than it used to take with other TTRs. This test also includes a pass/fail limit of individual ratios.

Three-Phase TTR, remote controlled TTR300

Three-Phase TTR, stand alone or remote controlled TTR310

Three-Phase TTR with PowerDB ONBOARD TTR330

Included Accessories

Canvas carrying bag for test leads 30915-211

Power supply cord, 8 ft (2.5 m), 120 V 17032-4

Power supply cord, 8 ft (2.5 m), 230 V 17032-13

Ground lead, 15 ft (4.6 m) 4702-7

Hand-held TEST switch assy for remote operation 30915-220

PowerDB LITE software

RS232 cable for connecting to a PCfor use with TTR300 and TTR310 CA-RS232

Ethernet cable for connecting to a PC for use with TTR330 36798

Transformer Vector Voltage Diagram Set (for ANSI, IEC, and AS Standards) for TTR310 35314

Spare fuse kits:

for TTR300 and TTR310 35026-3

for TTR300-47 and TTR310-47 35026-4

for TTR330 35026-5

for TTR330-47 35026-2

Instruction manuals:

for TTR300 AVTMTTR300

for TTR310 AVTMTTR310

for TTR330 AVTMTTR330

Optional Accessories

PowerDB software, 1st machine license, soft key DB1001-A

PowerDB, 1st machine license, USB dongle DB1001S-A

TTR check box 550555

3-ø lead set adapter to allow use of Megger TTR C/N 550503 lead set (30915-xxx) 37087

3-ø TTR calibration standard 550055

3-ø shielded test lead set, X and H winding, 30 ft (9.1 m) 37093

3-ø shielded test lead set, X and H winding, 50 ft (15 m) 37094

1-ø shielded test lead set, X and H winding, 30 ft (9.1 m) 37095

Inverter with 3 ft (0.91 m) cigarette adapter cord

12 V dc to 120 V ac, 60 Hz 35271-1

12 V dc to 120 V ac, 50 Hz 35271-3

12 V dc to 230 V ac, 60 Hz 35271-2

12 V dc to 230 V ac, 50 Hz 35271-4

TTR printer package for TTR310 120 V, 60 Hz 1001-390

230 V, 50 Hz 1001-401

USB portable thermal printer (120V) for TTR330 36493-1

USB portable thermal printer (230V) for TTR330 36494-1

Thermal paper (8.5” x 11”) for printer 36809-1

Thermal paper (A4) for printer 36809-2

Replacement/spare battery pack for printer 37077

Bushing clips (6) MC7144

Transit case (for instrument, leads and accessories) 37009

Universal lead sets, compatible with Megger MTO3XX Series products (up to 10 A DC max)3-phase shielded test lead set, X and H windings

60 ft (18 m) 36486-5

30 ft (9 m) 36486-6

33 ft (10 m) extension 36486-9

Field upgrade kits

TTR330 interface panel 37089-1

TTR300 interface panel 37089-4

Factory upgrade to TTR310 Consult factory