Portable Three‑Phase Transformer Short‑Circuit Impedance Tester for Winding Deformation Detection

Portable Three‑Phase Transformer Short‑Circuit Impedance Tester for Winding Deformation Detection

Product Description

Used for transformer’s low voltage short circuit impedance test in filed or lab conditions.

Product Alias

Three‑Phase Transformer Short‑Circuit Impedance Analyzer / Low‑Voltage Three‑Phase Transformer Winding Deformation Tester / Transformer Impedance and Load‑Loss Tester / Portable 3‑Phase Power Transformer Winding Fault Detector / Three‑Phase Transformer Winding Distortion Test Instrument

Features

1. 3 phase short circuit impedance test, display 3 phase voltage, 3 phase current and 3 phase power, automatic convert percentage of impedance voltage of transformer under rated temperature and current
2. Automatic test the percentage difference between actual impedance value and value in data plate.
3. Large color LCD touchscreen.
4. Built-in micro-printer.
5. Up to 200 sets test data storage
6. USB port for data storage.
7. High precision, good stability small size and light weight, wider measuring range.

Product Parameters

Application Scenarios

FAQ

Question 1: What parameters can this three‑phase short‑circuit impedance tester measure?
Manufacturer: This three‑phase tester adopts low‑voltage measurement principle. It can measure three‑phase short‑circuit impedance, leakage reactance, impedance voltage, load loss and power factor of power transformers. By comparing test data with factory values or historical records, technicians can evaluate winding deformation, displacement and loose conditions caused by short‑circuit impact, transportation shock or long‑time operation aging. It supports both three‑phase synchronous test and separate single‑phase test modes. Built‑in touch screen and thermal printer allow on‑site data review and test‑report output. This instrument is widely used for transformer factory ex‑works inspection, hand‑over acceptance and preventive maintenance in substations and power plants.
Question 2: Why do test data show large deviation compared with transformer nameplate parameters?
Manufacturer: Several field factors may cause obvious deviation. First, check all three‑phase high‑current test cables and voltage leads. Ensure all alligator clips are tightly fastened on clean, non‑oxidized transformer terminals; rust, dirt or poor contact will introduce extra contact resistance and distort test results. Second, confirm the low‑voltage side of transformer is correctly short‑circuited according to winding connection type. Wrong short‑circuit connection directly produces wrong measured values. Third, keep test cables far away from live high‑voltage busbars to reduce electromagnetic interference. Besides, make sure the on‑load tap‑changer position is exactly the same as the factory‑test tap position. Different tap positions will generate different impedance readings. If deviation still exists after full inspection, it may indicate real winding mechanical deformation, which needs comprehensive judgment combined with multiple groups of historical test data. Do not disassemble the instrument housing without manufacturer authorization.
Question 3: What safety rules should be followed during on‑site three‑phase transformer testing?
Manufacturer: The transformer under test must be fully de‑energized and completely discharged before connecting any test cables. Live testing is strictly forbidden. Operators shall comply with substation high‑voltage safety regulations and maintain sufficient safety clearance from transformer high‑voltage terminals. Check cable insulation surface for cracks or damage before use; avoid pulling cables sharply or placing them over sharp metal edges. Never plug or unplug test clamps when the tester is running. If the site suffers heavy electromagnetic interference, rearrange cable layout and separate signal leads from high‑voltage equipment. For large‑capacity transformers, finish phase‑by‑phase inspection after three‑phase group test for cross‑verification of measurement consistency.
Question 4: How to troubleshoot unstable and fluctuating readings during field measurement?
Manufacturer: Please perform troubleshooting step by step. Firstly, inspect three‑phase high‑current cables and voltage sensing leads, confirm connectors and clamp jaws are free of oxidation and damage, re‑clamp each terminal for reliable metal‑to‑metal contact. Secondly, re‑check the low‑voltage short‑circuit connections of transformer; insufficient short‑circuit contact is one of the most frequent reasons for data jitter. Thirdly, restart the tester and execute the built‑in self‑check program to verify hardware working status. Fourthly, adjust cable routing to stay away from high‑voltage live equipment and power cables to suppress electromagnetic noise. If readings still cannot stabilize after above operations, stop testing immediately and contact manufacturer technical support for assistance. Do not continue measurement under abnormal status.
Question 5: What are the requirements for daily use, maintenance and calibration cycle of this tester?
Manufacturer: For the built‑in thermal printer, use matched thermal paper and install it with heat‑sensitive side facing inward to avoid blank printing. After field tests, clean dirt and oxidation residues from all clamp jaws. Do not twist or pull test cables with excessive force. Store the whole set inside the matched hard protective case in dry and ventilated space, avoid moisture, heavy impact and direct sunlight. It is recommended to send this tester to qualified metrology laboratory for periodic calibration every 12 months. If the instrument frequently works in harsh substation environments, shorten calibration interval to 6 months. Before important acceptance projects, complete full self‑inspection for host, test cables and accessories to guarantee measuring reliability.
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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