The transformer turns ratio(TTR) test is one of the fundamental transformer routine tests declared defined in both IEC 60076-1 and IEEE C57.12.90. The transformation ratio test of the transformer is a test to verify whether the transformer can achieve the specified voltage conversion effect and whether the transformation ratio conforms to the technical conditions of the transformer or the value specified on the nameplate. The purpose is to check whether the number of turns of each winding, the assembly of lead wires, and the indication position of the tap changer meet the requirements; The parallel operation of small and medium-sized transformers with a ratio difference of 1% will generate a circulating current of 10% of the rated current in the transformer windings, which will greatly increase the loss of the transformer and be detrimental to the operation of the transformer.
The JYT TTR is a new-generation transformer turns ratio tester that incorporates a high-precision multi-core ARM CPU (Advanced RISC Machines, USA), delivering outstanding measurement accuracy and resolution. Weighing only 1.6 kg, the JYT is perfectly suited for both field use and extended testing applications.
Equipped with a robust built-in lithium battery, it supports over 800 test cycles on a single charge. Compact and highly portable, the instrument is fast, efficient, and precise, with a rapid test time of just 1.2 seconds.
The JYT TTR is an ideal solution for variable turns ratio testing across power generation, transmission and distribution, substations, industrial facilities, and transformer manufacturing environments.
1.JYT is equipped with a powerful built-in lithium battery, suitable for field testing, and can perform more than 800 tests on a single charge.
2.It has 8 connection poles, meeting the requirements for transformer turns ratio testing, from distribution transformers to power transformers, current transformers (CT), voltage transformers (PT), and Z-type connection transformers.
3.JYT features a 5.6-inch color, high-brightness touch screen, allowing the tester to be used both indoors and outdoors.
4.It includes a mechanical key for "run/stop".
5.JYT is equipped with a battery monitoring and protection function.
6.It has a "flash disk" interface for exporting data and a Bluetooth communication function.
7.JYT turns ratio tester features high and low voltage reverse connection protection, transformer short circuit protection, and inter-turn short circuit protection.
JYT Technical Specification
|
TYPE |
JYT Hand held TTR |
|
Ratio Range |
0.9-10000 |
|
Minimum Resolution |
0.0001 |
|
Accuracy |
±0.1%（ ratio value <500） |
|
Output Voltage |
Max. 35V/50Hz |
|
Battery Endurance: |
≥ 800 tests per full charge (Quick Mode) |
|
Data Storage Capacity |
100 sets |
|
Operation Temperature |
-20℃ ~40℃ |
|
Relative Humidity |
≤80%, No condensation |
|
Dimensions (L × W × H) |
L210mm x W150mm x H70mm |
|
Net Weight |
Approx.1.6 kg |
JYT turns ratio tester Demo Video
Three Phase Connection
Single Phase Connection
Unlike traditional flip-cover testers, the JYT features an open-end terminal design, allowing test leads to connect in any direction. This prevents cable bending, ensures accurate results, and makes setup faster in tight spaces — ideal for frequent field testing.
It’s designed for power, distribution, CT, PT, and OLTC transformers across multiple voltage levels.
Kingrun Transformer Instrument Co.,Ltd.
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