Portable Transformer Turns Ratio Tester, Automatic TTR Vector Group Tester

1. Single power input with internal digital combination standard sine wave test source output
2. Phase angle measurement function for high and low voltage side phase relationships
3. Non-integral point transformer turn ratio and angle measurement capability
4. Single-phase measurement and three-phase winding automatic testing
5. Automatic three-phase turn ratio, phase angle, error, tapping position, and connecting group identification
6. Digital and hexagon vector diagram display for clear transformer connecting group visualization
7. Blind test function - no need to select connecting method or group
8. Automatic connection method shifting for Y/△ and △/Y transformers without external short-circuit
9. Tapping test function for quick TTR and TTR error measurement at each tap position
10. Turns ratio measurement and voltage TTR measurement capabilities
11. 5.6 inch LCD display for clear data and figure visualization
12. Compact, lightweight design for easy portability
13. Built-in high capacity rechargeable lithium battery - over 500 tests per charge

Product Parameters

Application Scenarios

FAQ

Question 1: What main functions can this portable transformer turns ratio tester realize?
Manufacturer: This portable TTR tester is designed for on‑site and factory inspection of power transformers. It can accurately measure transformer turns ratio, voltage ratio, phase group, polarity and tap‑changer position. By comparing measured ratio value with theoretical data, users can find winding short‑circuit, turn‑to‑turn short fault and winding connection errors. It supports both three‑phase and single‑phase transformers, covers Y, D, Yn winding connection modes. Equipped with color screen, built‑in thermal printer, data storage and USB export function, test reports can be saved and exported for file archiving. It is widely applied for transformer factory ex‑works test, substation acceptance test, routine preventive maintenance and fault troubleshooting.
Question 2: What preparation work should be completed before performing transformer turns ratio test?
Manufacturer: Ensure the transformer is fully powered‑off and reliably grounded. Inspect test cables and alligator clips for breakage or insulation damage. Clean dirt and oxide on high‑voltage and low‑voltage bushing terminals to guarantee stable contact. Record transformer nameplate information including rated turns ratio, vector group and tap‑changer gears. Complete instrument self‑check, strictly follow wiring diagram to connect voltage test lines, confirm no mis‑connection before starting formal measurement.
Question 3: Why does large deviation occur between measured turns ratio and theoretical nameplate value?
Manufacturer: First check for wrong or loose wiring connections. Confirm tap‑changer is adjusted to the correct test gear. Remove oxidation layer on bushing terminals to eliminate contact resistance interference. If transformer internal winding has turn‑to‑turn short‑circuit or winding deformation, obvious ratio deviation will also appear. Reconnect cables and retest. If deviation still exists, it suggests potential internal winding defects of the transformer.
Question 4: Test data cannot be saved or exported via USB flash drive, how to troubleshoot?
Manufacturer: Make sure the whole test procedure is fully finished before executing save operation. Check whether the USB drive is inserted firmly and formatted to compatible file system. Confirm USB storage space is not full. Reboot the tester and repeat measurement. If export still fails, replace another qualified USB flash drive and try again. Do not pull out USB device during data transmission.
Question 5: What are the key notes for testing on‑load tap‑changer transformers?
Manufacturer: Keep transformer completely de‑energized during the whole test process. Manually switch tap‑changer gear step‑by‑step, wait for signal stabilization before reading data. Test every tap position as required. Do not operate tap‑changer with external voltage connected. Compare measured ratio data of each gear against nameplate parameters. Abnormal ratio at certain tap position indicates possible tap‑changer contact failure, which needs further inspection.
Question 6: 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: 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: 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: 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 

Shipping scenario

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