Multi-function Transformer Turns Ratio Tester

The Multi-function Transformer Turns Ratio Tester is an efficient and multifunctional modern power testing tool. It integrates key transformer testing that previously required multiple instruments into one device, improving accuracy, efficiency, and portability while reducing costs. For professionals engaged in transformer design, production, installation, or maintenance, it is a powerful and essential instrument. When choosing, specific needs (such as DC resistance, loss measurement), budget, and supplier support should be considered.

1. Input single power supply, internal digital combination standard sine wave test source output.

2. Phase angle measurement function: measure the phase angle between the high voltage side and the low voltage side. Measure the turns ratio and angle of non integral point transformers.

3. Can perform single-phase measurement and automatic testing of three-phase windings. The ratio of three-phase turns, phase angle value, error, tap position, and tap value can be measured once. It can also automatically identify the connection group number.

4. The test results can be displayed in the form of numbers and hexagonal vector diagrams, making the transformer wiring group clear at a glance.

5. Equipped with blind testing function: no need to select connection method and group. Measure Y/△, △/Y-shaped transformers without the need for external short circuits, and the connection method can be automatically switched according to the selected test content.

6. Equipped with tap test function: it can quickly measure the TTR and TTR error of each tap switch position. By inputting the rated TTR once instead of repeatedly, the TTR error of the tapping position can be calculated.

7. It has the functions of measuring turns ratio and voltage TTR.

8. Adopting a 5.6-inch LCD display, the data and graphic display effects are intuitive and delicate.

9. Small in size, lightweight, and easy to carry.

10. Built in large capacity rechargeable lithium battery? battery The test can be conducted without a power source on site, and once the battery is fully charged, it can be measured continuously for more than 500 times.

● High Accuracy Ratio Measurement
Measures turns ratio with accuracy of ±0.05% to ±0.1%, detecting shorted turns, open windings, and incorrect tap changer positions that other tests might miss.
● Automatic Excitation Current Test
Simultaneously measures excitation current at each tap position, revealing core saturation issues, winding insulation degradation, or magnetic circuit problems.
● Phase Displacement & Vector Group Verification
Automatically identifies the transformer's vector group (e.g., Dyn11, Yyn0) and verifies correct phase displacement, preventing parallel operation errors.
● Built-In Tap Changer Testing
Performs ratio and excitation current tests across all tap positions automatically, detecting tap changer contact wear, mechanical misalignment, or open circuits.
● Three-Phase Simultaneous Measurement
Tests all three phases at once in seconds, saving significant time compared to single-phase testers that require multiple connections and re-tests.
● No External Power Supply Needed
Operates on internal battery or standard 220V/110V outlet, generating its own test voltage (up to 40V or higher) without requiring external variable transformers.
● Polarity & Phase Angle Check
Confirms correct polarity and measures phase angle deviation (typically ±0.2° accuracy), essential for differential protection and paralleling transformers.
● Pass/Fail Indication with Standards
Compares measured ratio against nameplate value and displays clear pass/fail results based on user-defined tolerance (e.g., ±0.5%), making field decisions immediate.
● Data Storage & Report Generation
Stores hundreds of test records internally and exports to USB/PC for Excel, Word, or PDF reports, including ratio error graphs and tap change sequences.
● Portable & Rugged for Field Use
Weighs 3kg in a rugged carrying case, battery-powered for substation or remote site testing without needing external power or heavy accessories.

1. Transformer factory testing: Quality control is carried out according to design specifications.

2. Debugging and testing: Key pre power on inspection of the new unit.

3. Preventive maintenance/diagnosis: detect winding deformation, tap problems, or inter turn faults.

4. Fault diagnosis and post repair verification: troubleshooting and verification.

5. CT/PT calibration: ratio, polarity, phase angle, and resistance testing.

6. Power plants, substations, and industries: daily maintenance.

7. Manufacturer (transformer/motor): Production quality control.

8. Testing laboratory and third-party services: professional evaluation.

9. University and Research: Education/Research and Development.

1.The multi-function transformer turns ratio tester adopts high-performance lithium-ion rechargeable battery power supply internally. In order to avoid damaging the instrument due to incompatible voltage levels, operators cannot replace it with other types of batteries at will.

2.The multi-function transformer turns ratio tester should be charged in a timely manner to avoid deep discharge of the battery affecting its lifespan.

3.When used under normal working conditions, the instrument should be charged daily (preferably once a month if not in use for a long time) to prevent adverse effects on battery usage and lifespan. Each charging time should be at least 6 hours. The charging protection function of the battery can continuously charge the instrument.

4.When the battery is removed from the instrument, the battery protection panel (inside the instrument) will enter a protective state. After installing the battery, the instrument cannot work directly, so a charger should be used to release the protection state for the instrument to operate normally.

1. Before measurement, ensure that the test sample is in a power-off state and all calibration terminals are not grounded.

2. The measurement connection must be strictly operated according to the instructions, otherwise any serious consequences will be borne by you.

3. Before measurement, it is necessary to carefully check the set parameters.

4. A power socket with a grounding wire is the best choice for charging.

5. Overloading work is strictly prohibited.

6. It is prohibited to connect high and low voltage in reverse.

Wuhan UHV Power Technology Co., Ltd. is a professional OEM manufacturer specializing in high-voltage testing equipment – from R&D and sales to after-sales service. Our modern intelligent factory covers more than 40,000 square meters and features over 100 automated units for production, assembly, and testing. With CE certification and a global customer base of over 20,000, we have earned a strong reputation for delivering competitive products backed by solid technical support. That is why customers around the world trust and recommend us.

1. What is a multi-function transformer turns ratio tester?
A multi-function transformer turns ratio tester is an electrical testing equipment used to detect transformer ratio, group, phase angle, and related parameters. It can be used for transformer production, handover testing, and maintenance testing. By testing the deviation between the actual transformation ratio and the rated transformation ratio, it can assist in determining whether the transformer winding, tap changer, and wiring are normal.
2. Does the multi-function transformer turns ratio tester support blind testing?
Support. The UHV series transformer ratio tester has blind testing function, and can also perform transformer ratio, group and other tests without knowing the parameters such as the high and low voltage connection mode of the tested transformer.
3. Can the multi-function transformer turns ratio tester automatically determine the transformer group?
Okay. The equipment can automatically identify the transformer group number based on the test results, and judge the wiring situation by combining phase angle, vector diagram and other information, which helps reduce manual calculation and judgment errors.
4. Does the instrument have a protective function during the testing process?
have. The instrument can automatically detect the load current of the output test source, and provide protection in case of external test circuit overload or short circuit, stop the test and give a prompt, thereby reducing the risk of equipment damage.
5. Can the multi-function transformer turns ratio tester be used on site?
Okay. The device adopts a portable design and is equipped with a large capacity lithium-ion rechargeable battery. It can also be tested on site without an external power source, making it very suitable for substations, transformer production sites, maintenance sites, and field operations.
6. Is the multi-function transformer turns ratio tester suitable for export procurement?
Suitable. For overseas buyers, it is recommended to confirm the testing scope, accuracy, applicable transformer type, local power specifications, language interface, calibration certificate, testing line configuration, packaging and transportation, and after-sales technical support requirements when inquiring, so that suppliers can provide matching models based on actual projects.

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