Megabras Transformer Ratio Tester from the United States

NegotiableUpdate on 05/09

Model

Nature of the Manufacturer: Producers

Product Category

Place of Origin

Online Consult

Overview

Product Details

Product Overview

The Transformer Ratio Tester TR8703 is a digital ratio tester designed specifically for on-site testing, used to measure the turns ratio or ratio of power transformers, voltage transformers (VT/PT), and current transformers (CT). The instrument adopts a fully automatic operation mode, and users do not need to manually calibrate, select ranges, or perform tedious balance adjustments. During each testing cycle, TR8703 will automatically perform multiple pre checks, including detection of H/X wire reversal, tested circuit/winding connectivity, and short-circuit status (high current condition). After the test is completed, the results will be directly displayed on the LCD screen and key parameters such as transformation ratio, excitation current, polarity, and deviation will be presented to the user. These parameters have reference value for diagnosing and predicting various faults that may occur in transformers.

Main features and specifications

feature	detailed description
measurement object	The turns ratio/transformation ratio of power transformers, voltage transformers (VT/PT), and current transformers (CT).
Operation Mode	Fully automatic, without the need for user calibration, range selection, manual handle operation, or tedious balance adjustment.
Auto Detection	Automatically detect H/X wiring reversal, tested circuit/winding connectivity, and short circuit status.
measurement range	VT/PT mode:0.8000 to 8000:1 (automatic range). CT mode:0.8000 to 1000.0 (automatic range).
Measurement accuracy (VT/PT)	-Variable ratio range 0.8000 to 9.9999: ± 0.2% reading. -Ratio range 10.000 to 999.99: ± 0.1% reading. -Ratio range 1000.0 to 4999.9: ± 0.2% reading. -Ratio range 5000.0 to 8000.0: ± 0.25% reading.
Measurement accuracy (CT)	Variable ratio range 0.8000 to 1000.0: ± 0.5% reading.
Excitation signal	VT/PT mode:最高 32 Vrms。 CT mode:Automatic level 0 to 1 A, 0.1 to 4.5 Vrms..
Excitation current display	Range: 0 to 1000 mA; Accuracy: ± (2% reading+2 mA).
Excitation frequency	70 Hz。
display screen	Dual row alphanumeric LCD display screen, 16 × 2 characters, with contrast adjustment and backlight control, day and night visibility.
Language support	English, Spanish, French, Italian, German, Portuguese.
measurement method	Compliant with IEEE Std C57.12.90 ™- 2006 standard.
data storage	Built in memory, capable of storing up to 99 objects, with 99 sets of test results for each object, totaling approximately 10000 test results.
data interface	USB 2.0 port (optically isolated, 115.2 KB), used for instrument configuration and downloading test results.
analysis software	Random attachment, supports data download and analysis.
power supply method	Two 12V, 5 × 2, 1650mAh nickel hydrogen (NiMH) rechargeable battery packs.
battery life	A single charge can support continuous operation for up to 10 hours.
Charging time	Less than 4 hours.
working environment	Reference temperature 23 ° C ± 5 ° C (30 to 50% relative humidity); The temperature coefficient is 25 ppm/° C..
safety	Designed for testing transformers that have been powered off; It has warning prompts for wire reverse connection, open/short circuit, and low battery level.

Core Features and Application Value

1. Fully automated operation to improve testing efficiency

No need for complicated settingsUsers do not need to perform manual calibration, range selection, manual operation, or complex balance adjustment. The instrument is fully automated to complete the testing process, which can significantly reduce the preparation time for testing and the possibility of human error.
Intelligent pre check functionIn each testing cycle, the instrument will automatically check the reverse connection of H/X wiring, the connectivity of the tested circuit (if configured), and short-circuit conditions. Once abnormalities are detected, such as incorrect lead connections, reversed polarity, open or short circuits, etc., the display screen will issue warning messages to help users promptly troubleshoot connection errors and ensure smooth testing.

2. Low voltage drop measurement technology to ensure operational safety

Safety first designTR8703 adopts low-voltage voltage reduction measurement technology to apply test excitation to the high-voltage "H" winding. Compared to traditional methods, this design helps improve the safety of operators and expands the range of transformer types and sizes that can be tested by the equipment.
Strict testing environment requirementsThis instrument is designed for transformers that have been powered off ("dead"). Before testing, it is necessary to ensure that the tested equipment has been disconnected from the AC power supply and fully discharged to ensure the safety of personnel and equipment.

3. Comprehensive data analysis and intelligent diagnosis

Multidimensional test resultsTR8703 not only displays the transformation ratio, but also providesexcitation current、polarityandbiasParameters such as deviation percentage compared to nameplate value. Combining these parameters together helps users to have a more comprehensive assessment of the transformer's condition.
Data recording and comparisonUsers can save the nameplate voltage value and perform real-time comparison during the data acquisition process. Each measurement record is accompanied by a date and timestamp to ensure the integrity and traceability of the test information. The data can be stored inside the instrument or downloaded to a computer through accompanying software for further analysis, facilitating the generation of test reports.

4. Portable and sturdy design

Lightweight and durableThe instrument adopts a lightweight and durable portable design, suitable for use in various on-site environments. Equipped with an intuitive LCD display screen (16 × 2 characters, with backlight control), the results can be read clearly during both day and night.
Flexible power supply solutionBuilt in two rechargeable nickel hydrogen (NiMH) battery packs, providing up to 10 hours of continuous operation capability when fully charged, making it convenient for long-term testing in situations lacking external power. The battery charging time is less than 4 hours and is equipped with an intelligent charger that supports universal AC input (90 to 264 Vrms).