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TTR20變比測試儀

 
美國MEGGERTTR20變比測試儀產(chǎn)品分類
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實(shí)驗(yàn)分析測試 實(shí)驗(yàn)分析測試
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TTR20變比測試儀|美國MEGGERTTR20變比測試儀-變壓器變比測試儀價格
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北京,上海,天津,河北,南京送貨上門, 其它省市簽約快遞公司送貨!部分地區(qū).2000元以下.支持貨到付款.
美國MEGGERTTR20變比測試儀詳細(xì)介紹
TTR20變比測試儀性能特點(diǎn)
  • Fast, easy h-held operation. No need to kneel or bend down to operate the instrument.
  • Powered by six stard “AA” alkaline batteries; no ger needed. Provides up to 12 hours of field operation.
  • 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 improves set-up time.
  • Perfect for meter shops, the TTR20 can be used for inspection purposes to determine the no-load accuracy of most CTs PTs. It also can be used to determine the need to test potentially faulty CTs PTs.
  • Automatic self-calibration for each test.
Included Accessories:
  • 1 - 35938 Combined test leads, "X/H" winding, 1.8 m (6 ft)
  • 1 - AVTMTTR20 Instruction manual



  Description

The Megger TTR20 is an automatic h-held battery operated transformer turns ratio test set. It is used to measure the turns ratio, excitation current polarity of windings in single- three-phase distribution power transformers (tested phase by phase), potential & current transformers, tapped transformers.

The unique design of the TTR20 allows the user to operate the test set while holding it in one h. It effectively eliminates the user from having to kneel or bend down to operate the instrument speeds up testing time. Realizing the extreme environments in which the TTR20 must operate, special attention has been paid to making it extra rugged, with a high impact, shock resistant case, yet incredibly lightweight at a mere 870 g (1.9 lbs).

Its design makes this instrument well suited for use in a variety of harsh environments. The TTR20 is particularly suited for testing in substations, transformer-manufacturing environments, meter shops. It features a high-contrast, backlit LCD screen which can be seen in bright or ambient light.

This unit measures a high turns ratio of 10,000:1 accurately with the lowest excitation voltage. The excellent repeatability of the TTR20 helps the users to determine the condition of transformers under test. It is designed for simple, one button operation with the measured results displayed directly on the easy to read LCD or printed to the optional printer. The TTR20 needs no additional software comes ready to use complete out of the box.

APPLICATIONS
The proper operation of a transformer relies almost entirely on the electrical properties of its windings. To ensure continued proper operation, transformers are tested to verify that their electrical properties have not changed from design specifications. A TTR is an extremely useful instrument for testing transformer windings because it can help locate several types of problems within single- three-phase transformers.

It it used to determine the no-load accuracy of CTs PTs also determine the need to further test faulty CTs PTs. The TTR20 applies voltage to the high-voltage winding of a transformer accurately measures the resulting voltage from the low voltage winding. The ratio of voltages is directly proportional to turns ratio. In addition, the unit measures excitation current polarity.

TRANSFORMER TURNS RATIO
A Transformer Turns Ratio Test Set such as the TTR20 can directly measure the turns ratio of single-phase transformers as well as three-phase transformers. Deviations in these measurements will quickly indicate problems in transformer windings in the magnetic core circuits. Transformer ratio can change due to several factors, including physical damage from faults, deteriorated insulation, contamination shipping damage. If a transformer ratio deviates more than 0.5 percent from the rated voltage ratio, it may not operate reliably. To measure small ratio changes such as this, the accuracy of a Megger TTR20 is needed.

Transformer Polarity
Polarity of a distribution transformer becomes of interest in order to determine its proper connection within a power network. The Megger TTR20 will identify normal (in phase) reverse polarity of the single-phase transformers.

Type of Power Six stard “AA” (IEC LR-6) alkaline batteries
Battery Life 12 hours of field operation
Excitation Voltage 8 V rms for testing distribution or power transformers 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 acters by 8 lines)
Transformer Winding Phase Relationship ANSI C57.12.70-1978
Safety/EMC/Vibration Meets the requirements of IEC-1010-1, CE 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 huity Operating: 0 to 90% noncondensing
Storage: 0 to 95% noncondensing
Protective Devices High voltage side shorting relay, transient voltage suppressors 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
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