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Megger TTR20-1
Catalog #: TTR20-1
Handheld Single-/Three-Phase Transformer Turns Ratio Tester
- Overview
- Specifications
- Summary
- Accessories
Product Highlights
- Fast, easy hand-held operation.
- Single- and three-phase transformer testing
- Provides up to 12 hours of field operation.
- Automatic self-calibration for each test.
- Simple, one-button operation Quick-start guide on front panel
- Powered by six standard “AA” alkaline batteries; no charger needed.
- Measures turns ratio range of 10,000:1, with a high accuracy (±0.1%, 0.8 to 2000) at a low excitation voltage
- Records ratio errors for bushing CTs to an accuracy of±0.1% nameplate. This reduces the need for additional test equipment and improves set-up time.
- Perfect for meter shops, the TTR20-1 can be used for inspection purposes to determine the no-load accuracy of most CTs and PTs. It also can be used to determine the need to test potentially faulty CTs and PTs.
Each Unit Includes
- 1 - Handheld Transformer Turns Ratio Tester (TTR20-1)
- 1 - Combined Test Leads, "X/H" Winding, 6 ft. / 1.8 m
- 1 - Instruction Manual
| Specifications |
| Type of Power |
Six standard “AA” (IEC LR-6) alkaline batteries |
| Battery Life |
12 hours of field operation |
| Excitation Voltage |
8 V rms for testing distribution or power transformers and PTs
0.5, 1.5, or 8 V ac rms for testing CTs.
The excitation voltage is switched automatically if excitation current exceeds a preset value. |
| Test Frequency |
55 Hz internally generated providing a universal 50/60 Hz test set |
| Excitation Current Range |
0 to 100 mA, 4-digit resolution |
| Turns Ratio Range |
0.8 to 10,000, 5 digit resolution |
| Transformer Polarity |
Normal or reversed |
| Current (rms) accuracy |
(2% of reading + 1 digit) |
| Turns Ratio Accuracy |
0.1% (0.8 to 2000)
0.15% (2001 to 4000)
0.25% (4001 to 10,000) |
| Display full graphics |
LCD module
adjustable back-lighting
wide temperature range
128 x 64 dots (21 characters by 8 lines) |
| Transformer Winding Phase Relationship |
ANSI C57.12.70-1978 |
| Safety/EMC/Vibration |
Meets the requirements of IEC-1010-1, CE and ASTM D999.75 |
| Temperature Range |
Operating: -20º C to 55º C (-5º F to 130º F)
Storage: -50º C to 60º C (-55º F to 140º F) |
| Relative humidity |
Operating: 0 to 90% noncondensing
Storage: 0 to 95% noncondensing |
| Protective Devices |
High voltage side shorting relay, transient voltage suppressors and gas surge voltage protectors |
| Measuring Time |
Less than 5 seconds |
| Measurement Method |
ANSI/IEEE C57.12.90 |
| Dimensions |
240 H x 115 W x 50 D mm
(9.5 H x 4.5 W x 1.9 D in.) |
| Weight |
Approximately 1.3 kg (2.8 lb), including leads |
| Country of Origin |
United Kingdom |
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