Transformer Turns Ratio Tester

Palm Transformer Turns Ratio (TTR) Tester -JYT

ARM Integrated CPU
Built-in lithium battery test 800 times by one charge
Simutaneously 3 phase ratio testing
Measure from distribution transformer to power transformer, current transformer (CT), voltage transformer (PT) and Z-type connection transformer
Product description: Real 3-phase testing;1.6 kg only, 72 working hours;for transformer below 1000kV,
INQUIRY

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.

Functional Characteristics

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） ±0.2%（ ratio value 500~2000） ±0.3%（ ratio value 2000~10,000）
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

JYT Transformer Turns Ratio Testing Connection:

JYT's 3 phases wiring diagram to transformer

Three Phase Connection

JYT's single phases wiring diagram to transformer

Single Phase Connection

Features and advantages of JYT handheld <a href=http://www.kritester.com/transformer-turns-ratio-tester.html target='_blank'>turn ratio tester</a>

Frequently Asked Questions (FAQ)

1. What makes the JYT Portable turns ratio tester stand out from other brands?

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.

2. How accurate is the JYT tester?

The JYT delivers 0.1% ratio accuracy, meeting IEC 60076-1 and IEEE C57.12 standards.

Such precision ensures reliable data for both power and distribution transformers, giving engineers full confidence in every measurement.

3. Can it test both single-phase and three-phase transformers?

Yes. It supports both single-phase and three-phase tests and automatically identifies vector groups.

Whether you’re testing Y, Δ, or zigzag connections, the JYT adapts automatically — saving you time on setup and calculations.

4. How durable is the JYT tester for outdoor work?

Its high-strength casing complies with IEC 60068 (vibration) and IP65 (dust & water protection) standards.

This makes it perfectly suited for harsh conditions — from desert substations to coastal humidity — wherever reliability is critical.

5. Does it need an external power supply?

No. The built-in lithium battery powers the JYT for an entire workday.

That means full mobility during on-site transformer maintenance without worrying about nearby outlets.

6. Is it easy to use for non-specialists?

Absolutely. The JYT tester offers one-button testing, auto polarity detection, and a 5-inch color touchscreen.

Even first-time users can complete precise ratio measurements in minutes — no complicated setup required.

7.What transformer types can the JYT measure?

It’s designed for power, distribution, CT, PT, and OLTC transformers across multiple voltage levels.

A wide testing range and stable voltage output make it ideal for both manufacturing and maintenance teams.

8. What after-sales service does KRI Tester provide?

We offer a 24-month warranty, lifetime technical support, and online training.

With expert engineers available for remote assistance, you can rest assured your tester stays accurate and reliable for years.

Kingrun Transformer Instrument Co.,Ltd.

global clients of kingrun transformer instrument

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