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Automatic Transformer Ratio & Vector Group Tester

Automatic Transformer Ratio & Vector Group Tester

Product Description

This Automatic Transformer Ratio & Vector Group Tester is a professional portable test instrument designed for power transformer on-site and factory inspection. It can accurately measure transformer turns ratio and automatically identify the vector group of three-phase transformers.

Equipped with a large LCD display and built-in thermal printer, the tester supports one-key automatic testing, quick data storage and printed test reports. The rugged yellow waterproof enclosure ensures reliable operation in harsh substation and field environments.

It is widely used for factory acceptance test, preventive maintenance, commissioning and overhaul of power transformers. Features high measuring accuracy, simple operation and strong anti-interference performance, ideal for power utilities, electrical testing institutes and transformer manufacturers.

Product Alias

Transformer Turns Ratio Tester / TTR Meter / Transformer Vector Group Detector / Power Transformer Ratio Test Instrument
Features

1.Automatically measure transformer connection group.
2.Automatically proceed transformation of group.
3.Automatically change phase sequence.
4.Automatically change scope of measurement.
5.Automatically check.
6.Aafter input standard transformation ratio, calculate relative error automatically.
7.When the measurement is finished just one time, testing voltage is isolated automatically.
8.Locate datum, the result measured is saved automatically. The former datum can be looked into.
Product Parameters

Transformer Ratio	1--10000
Group	1--12 point (12 vector groups)
Accuracy	0.2 class
Power supply	AC220V 10%, 50HZ
Environment temperature	-5ºC--40ºC
Humidity	<85%
Size	430320215mm
Weight	10kgs

Application Scenarios

FAQ

Question 1: Abnormal ratio reading / Inconsistent test data
Customer: When performing transformer ratio test, the measured ratio value keeps fluctuating and cannot get stable and repeatable results. What causes this problem?
Manufacturer: Check whether the transformer has residual magnetism before testing. Confirm all high and low voltage winding connections are fully disconnected and remove external parallel loads. Inspect test cables for aging, breakage or poor contact. Make sure the test clips are tightly clamped on clean metal terminals without rust or paint. Restart the device and perform test again. If readings remain unstable, stop testing and contact technical support. Do not disassemble the internal circuit of the tester.
Question 2: Vector group judgment error / Wrong vector group result
Customer: The instrument outputs a vector group result different from the transformer nameplate after finishing the test. How to troubleshoot this issue?
Manufacturer: Double check the wiring sequence of HV and LV terminals strictly following the operation manual. Confirm the transformer tap position matches the setting on the tester. Verify no residual voltage or induced voltage exists on the transformer windings. Check if the transformer has internal short-circuit between windings. Re-enter the transformer rated parameters and start a new test. If the error still exists, stop operation and contact our technical team for remote guidance. Do not modify internal program parameters without authorization.
Question 3: Instrument fails to start / No display after power on
Customer: After connecting the power supply and pressing the power button, the tester screen stays black and cannot boot up. What should I do?
Manufacturer: Check the power socket and power cord for damage or loose connection. Confirm the input voltage meets the rated requirement of the tester. Inspect the power fuse on the rear panel for burnout. Disconnect power supply and wait for 5 minutes then power on again. If the screen still cannot light up, stop using the equipment immediately. Contact technical support for repair. Do not replace fuse with non-specified type or open the instrument housing.
Question 4: Printing failure / Cannot print test report
Customer: After completing the transformer test, I click the print button but the built-in printer does not output paper or print blank pages. How to solve this?
Manufacturer: Check if thermal paper is installed correctly and confirm the paper roll is not jammed or exhausted. Verify the printer paper is installed in the right direction for thermal printing. Check if the print head is covered by dust or dirt, gently clean the print head with soft dry cloth. Restart the tester and retry printing. If the printer still cannot work, stop operation and contact technical support. Do not touch the hot print head directly to avoid scald.
Question 5: Test prompt: wiring error / Terminal connection alarm
Customer: The tester pops up wiring error alarm right after starting measurement, and the test cannot proceed. What are the reasons and solutions?
Manufacturer: Carefully check all test wires to confirm no cross connection between high voltage and low voltage terminals. Ensure all test leads are connected to the corresponding winding terminals correctly. Check whether there is short circuit between test clips or the transformer winding has short circuit fault. Remove all external grounding wires on transformer windings before test. Reconnect all cables firmly and restart the test. If the alarm keeps appearing, stop testing and contact technical support. Do not carry out test on live transformer.
Question 6: Shipping Method
Customer: If we place an order, how do you typically ship the goods? Will there be any issues with transporting bulky items such as reactors?
Manufacturer: We default to using dedicated logistics lines or brand-specific express shipping services; small-sized main units and accessories may also be shipped via standard courier services. Large items, such as reactors and excitation transformers, are packed using wooden crates or wooden frames for reinforcement to prevent bumps and moisture exposure during transit; a packing list is included with each package to facilitate item-by-item counting for you. Logistics costs are typically determined by both parties in accordance with the contract terms; after shipment, we will send you both the tracking number and the carrier's contact phone number for easy tracking.If your project site is remote or if delivery to the site is required with a specified logistics company, please inform us in advance when placing your order; we can then coordinate and arrange accordingly.
Question 7: Delivery Lead Time
Customer: Our project is under tight deadlines; how long will it take for the order to be shipped after we place it? Can we request expedited shipping?
Manufacturer: Standard specifications – stock available; typically delivered upon receipt of the order. Orders can be shipped within [X] working days; for non-standard products requiring customized voltage levels, capacities, or reactor combination configurations, the production cycle typically ranges from [X] to [Y] days.The delivery time will be approximately 7-15 working days; the specific timeline shall be subject to the sales confirmation provided upon order placement. If your project has a tight schedule, please inform us of the latest expected delivery date before placing your order; we will first verify the production schedule and inventory status, and where possible, will coordinate expedited production and prioritize shipment. However, it is recommended to allocate sufficient transit time for logistics to avoid delaying on-site testing.
Question 8: After-sales Service and Warranty
Customer: What is the warranty period for this equipment? If any issues arise during on-site use, how will your after-sales service respond?
Manufacturer: We provide a two-year free warranty on the entire unit and lifelong technical support services. During the warranty period, if issues arise due to defects in the equipment itself, we will provide free repair or replacement of components; when problems occur on-site, we commit to responding within 24 hours; most wiring and parameter configuration issues can be resolved through remote guidance via video or telephone; for cases where an on-site visit is necessary, we will arrange for our technicians to arrive at the location to resolve the issue. After the warranty period expires, we still offer repair services, with spare parts supplied at cost price for the long term, and software updates provided free of charge for life. Upon delivery of the equipment, we also offer free operational training (video operation guides)to ensure that your testing personnel can operate the equipment independently and proficiently; should you have any further questions, please feel free to contact our dedicated after-sales hotline directly.
Question 9: Shipping methods for each region (Sea freight)
Customer: Our projects are distributed across several states, and our procurement volumes are substantial; are the shipping methods consistent across all states? How is the delivery time calculated?
Manufacturer: The specifications are identical; however, it should be specifically noted that this equipment set is large in size and heavy in weight—components such as the reactor and excitation transformer are all classified as heavy components. Therefore, regardless of which state or region the shipment is destined for, we will uniformly utilize sea freight transportation. The packaging employs export-grade wooden crates with reinforced structures, along with moisture-proof and rust-proof treatments; the design of these wooden crates is optimized for long-distance sea transport and multiple lifting and transshipment operations. Upon arrival at the destination, simply unpack the goods and conduct an inspection before putting them into use. Regarding delivery time, the sea freight transit period depends on the port of destination: near-sea routes are generally faster, whereas ocean routes may take longer; the exact number of days will be confirmed based on the shipping schedule specified in the bill of lading. We have a dedicated freight forwarding agency to handle booking of shipping space, customs declaration, insurance, and other related procedures; once the vessel departs, we will send you documents such as the bill of lading and the packing list, enabling you to arrange for the receipt of goods at the port of destination and their inland transshipment in advance.
scenario
Scene (One)

Scene (Two)

Attachment Directory

No.	Name	QTY
1	TTR tester	1
2	Power line	1
3	Test line	1 set
4	Ground line	1
5	Operation manual	1
6	Fuse	1
7	Calibration certificate	4

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