The TTRT-03 can perform a specific test for each transformer type (such as single phase, delta to Y, Y to delta, delta to delta, or Y to Y) without the need to switch test hookupcables. Also, the unit’s automatic transformer phase detection feature can detect different transformer vector diagrams. The TTRT-03 can automatically detect and test 67 transformer types defined by ANSI, CEI/IEC and Australian standards. To prevent an accidental wrong test-lead hook-up (e.g., when the operator reverses H and X leads), the TTRT-03 outputs a low-level test voltage to verify the hook-up condition before applying the full test voltage to the transformer. In addition to measuring a transformer’s turns-ratio, the TTRT-03 can also measure a transformer’s excitation current (in milli-amperes) and its winding phase angle. Three test voltages (8 Vac, 40 Vac, 100 Vac) allow the TTRT-03 to test CT’s and PT’s, as well as power transformers. The TTRT-03 can also calculate the turns-ratio percentage error if the transformer’s nameplate voltages are provided. The baseline turns-ratio is calculated using the nameplate voltages, and the test results are compared to the baseline turns-ratio. The percentage error is then calculated from the difference between the baseline and test turns-ratios.
Thông số kỹ thuật
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Type
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Portable, automatic, three-phase transformer turns-ratio meter
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Physical specifications
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17”W x 7”H x 13” D (43.2 cm x 17.8 cm x 33.0 cm); Weight: 14 lbs (6.4 kg)
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Input power
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3 amps, 100 - 120 Vac or 200 - 240 Vac (selectable), 50/60 Hz
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Measurement method
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ANSI/IEEE C57.12.90
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Ratio measuring range
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0.8 - 15,000 (5-digit resolution)
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Turns ratio accuracy
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0.8 - 1999: ±0.1%, 2,000 - 3,999: ±0.25%, 4,000 - 15,000: ±1% @ 8 Vac
0.8 - 1999: ±0.1%, 2,000 - 3,999: ±0.20%, 4,000 - 15,000: ±1% @ 40 Vac
0.8 - 1999: ±0.1%, 2,000 - 3,999: ±0.15%, 4,000 - 15,000: ±1% @ 100 Vac
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Test voltages
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8 Vac @ 1 amp, 40 Vac @ 0.6 amp, 100 Vac @ 0.1 amp
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Excitation current reading range
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0 - 2 Amperes; Accuracy: ±1mA, ±2% of reading (±1 digit)
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Phase angle measure
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0 - 360 degrees; Accuracy: ±0.2 degrees ( ±1 digit)
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Display
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Back-lit LCD screen (20 Characters by 4 Lines); Viewable in bright sunlight and low-light levels
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Printer
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Built-in 4.5-inch wide thermal printer
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Computer interface
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One RS-232C port
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Pc software
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Windows®-based Transformer Turns-Ratio Analyzer application is included
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Internal test record storage
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Stores 200 complete transformer test records. Each test record includes nameplate voltage, winding turns-ratios, excitation current, and winding phase angle
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Internal test planstorage
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Stores up to 128 transformer test plans
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Safety
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UL Certified (UL 61010A-1), CAN/CSA Certified (C22.2 No. 1010.1-92)
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Environment
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Operating: -10°C to +50°C (+15°F to +122°F); Storage: -30°C to +70°C (-22°F to +158°F)
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Humidity
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90% RH @ 40°C (104°F) non-condensing
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Altitude
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2,000 m (6,562 ft) to full safety specifications
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Cables
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One 15-foot single-phase cable set, one 15-foot 3-phase cable set, one 25-foot extension cable set, one rs-232c cable, cable carrying bag
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Optional accessories
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Transportation case, transformer load tap-changer remote control device
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Warranty
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1 year on parts and labor
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