Portable Transformer No‑load & Load Loss Tester, Automatic Transformer Capacity Characteristic Tester

Application Scenarios

FAQ

Question 1: What main functions can this portable transformer no‑load & load loss tester realize?
Manufacturer: This portable tester is designed for on‑site and factory inspection of power transformers. It can accurately measure transformer no‑load loss, no‑load current, load loss and short‑circuit voltage, and automatically calculate the actual capacity of transformers. By analyzing measured parameters and harmonic components of voltage and current, users can identify iron‑core multi‑point earthing, winding inter‑turn short‑circuit, poor joint contact and other internal hidden defects. It supports both three‑phase and single‑phase transformers, covers Y, D, Yn winding connection modes. Equipped with color touch‑screen, built‑in thermal printer, data storage and USB export function, test reports can be printed, 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 no‑load and load loss test?
Manufacturer: Before testing, the transformer must be fully powered‑off and reliably grounded. Inspect the main unit, test cables and alligator clips to ensure no damage or insulation aging. Polish transformer wiring terminals to remove rust, paint and oxide layer for stable metal‑to‑metal contact. Confirm that input power supply meets instrument voltage requirement and finish equipment self‑check. Record nameplate information including rated capacity, rated voltage and connection group for subsequent data comparison. Install enough thermal printing paper in advance to guarantee normal report output during on‑site work.
Question 3: Why does the instrument show large‑fluctuation and unstable readings during field measurement?
Manufacturer: Unstable test data is mainly caused by wiring defects, external electromagnetic interference or abnormal power supply. Please check whether voltage and current test clamps are firmly connected, loose contact will introduce random contact resistance and cause reading drift. Keep test cables far away from high‑voltage live equipment and high‑power devices to reduce electromagnetic interference. Avoid unstable generator power supply; over‑long or thin power wires will also reduce measurement accuracy. Restart the tester for retest after above checks. If the problem still exists, replace test cables for further troubleshooting.
Question 4: Why cannot the built‑in printer output test reports normally and how to solve it?
Manufacturer: Common printing failures include reversed thermal paper installation, unfastened printer upper cover, incomplete saving of test data and disabled print function in system menu. Thermal paper can only display content on one side, please flip and reinstall it. Fasten the printer cover to ensure good print‑head contact. Complete the whole measuring procedure before triggering print command. Enter system setting menu to turn on print function if it is disabled. Replace with new high‑quality thermal paper when printed characters are too faint.
Question 5: How to judge potential transformer faults according to no‑load and load loss test results?
Manufacturer: Compare measured data with transformer nameplate values and historical test records comprehensively. If no‑load loss is obviously higher than standard value, it probably relates to iron‑core faults such as multi‑point earthing, silicon‑steel sheet damage or loose clamping parts. Excessive load loss usually indicates winding inter‑turn short‑circuit, bad contact of winding joints or tap‑changer. Abnormally high harmonic components remind operators to pay attention to iron‑core saturation status. Please note that field test results will be slightly influenced by ambient temperature, do not make fault judgment only rely on single‑group test data.
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

Scene (One)

Scene (Two)

Attachment Directory

Attachment Image