Digital ratiometer UHV-332

for transformers

Introduction to TTR Tester

• The UHV-332 Multi-function Transformer Turns Ratio Tester is a portable transformer turns-ratio (TTR) tester engineered for on-site and laboratory verification of transformer winding ratios and related diagnostics.

Applications and Scope of TTR Tester

• Testing of three-phase transformers.
• Measurement of Z-winding (zig-zag) transformers.
• Inspection of rectifier transformers.
• Suitable for transformers used in railway electrical systems.

Multimedia and documentation

• User manual (PDF) — available on the product page.
• Calibration certificate (PDF) — available on the product page.
• Product demonstration / overview video (YouTube).
• Product images and gallery.

Technical characteristics / specifications

• Model: UHV-332.
• Primary function: Transformer Turns Ratio (TTR) measurement.
• Supported transformer types: three-phase, Z-winding, rectifier transformers; railway electrical system transformers.
• Measurement use: on-site field testing and laboratory verification.
• Manufacturer / Brand: UHV Power (Wuhan UHV Power Technology Co.,Ltd).
• Available media: images, embedded video, user manual (PDF), calibration certificate (PDF).

Technical Specifications

• Variable ratio measurement range 0.9~10000
• Complete three-phase test within 35 seconds of measuring speed
• Measurement accuracy:

The measurement accuracy of the high-voltage side voltage is 0.05%
The measurement accuracy of low-voltage side voltage is 0.1%
Phase angle resolution: 0.01 °
Phase angle measurement accuracy: 0.1 °
Variable ratio resolution: 0.0001

• Variable ratio measurement accuracy

0.1% (0.9-200) /0.2%2002000)/ 0.3%200010000
According to user requirements, equipment with a full range of 0.1 level can be customized

• Output voltage test: ordinary transformer AC25V, test low input voltage transformer AC5V
• Convenient to carry and suitable for field operations
• Dimensions: 320mm (length) X 240mm (width) X 130mm (height)
• Weight 2.6kg

Precautions of TTR Tester

• 1. Before measurement, ensure that the tested equipment is in a power-off state and that all test terminals are not grounded.
• 2. When measuring wiring, it is necessary to strictly follow the instructions, otherwise the consequences will be borne by oneself.
• 3. Before testing, it is necessary to carefully check whether the set parameters are correct.
• 4. It is best to use a grounded power outlet when charging.
• 5. Cannot work under excessive limits.
• 6. It is strictly prohibited to connect high and low voltage in reverse

Application Field of Transformer Turns Ratio Tester

• It has important application value in multiple fields such as power systems, transformer manufacturing, power plants and substations, railway systems, petrochemical industry, new energy industry, as well as preventive maintenance and risk management. It has become an important tool for ensuring the stable operation of power systems and industrial production safety due to its high precision, easy operation, and intuitive data.

Battery maintenance and charging

• The instrument uses high-performance lithium-ion rechargeable batteries as its internal power source. Operators cannot replace other types of batteries at will to avoid damage to the instrument due to incompatible voltage levels.
• The instrument must be charged in a timely manner to avoid deep discharge of the battery affecting its lifespan. The standard charger for the instrument is a 12.6V/2A lithium battery charger, which cannot be replaced with chargers of other voltages.
• Under normal use, it is recommended to charge the instrument as much as possible every day (preferably once a month if not in use for a long time) to avoid affecting usage and battery life. The charging time should be at least 6 hours each time. Due to the internal charging protection function, the instrument can be continuously charged.
• After removing the battery from the instrument each time, the internal battery protection board of the instrument automatically enters a protective state. After reinstalling the battery, it cannot work directly and needs to be charged with a charger to release the protective state before it can work normally.

FAQS of Multi-function Transformer Turns Ratio Tester

• Question 1: Which transformers is the multifunctional transformer ratio tester suitable for?
• Answer: The multifunctional turns ratio tester is suitable for ratio testing of power transformers, distribution transformers, single-phase transformers, three-phase transformers, special transformers, and some CT/PT equipment. Supports multiple wiring methods and winding structures.

• Question 2: In what aspects is multifunctionality reflected?
• Answer: In addition to turns ratio, the tester can measure phase angle, polarity, vector group, excitation current, winding resistance (optional on some models), and tap changer position verification.

• Question 3: Can the multifunctional transformer turns ratio tester be tested on-site at the substation?
• Answer: Sure. The device adopts a portable design, with small size, light weight, and strong anti-interference ability, which is very suitable for use in substations, power plants, and power construction sites.

• Question 4: Is the multifunctional turns ratio tester accurate in testing in strong electromagnetic environments?
• Answer: Advanced models utilize frequency conversion technology and digital filtering algorithms to effectively suppress substation interference and ensure stable measurement results.