Portable Transformer SFRA Sweep Frequency Response Analyzer for Winding Deformation Test

• High-speed microprocessor with integrated acquisition control
• USB interface for computer connectivity
• Optional wireless Bluetooth interface
• DDS digital high-frequency sweep technology for accurate fault diagnosis
• Dual-channel 16-bit A/D sampling with clear waveform visualization
• Software-controlled signal output up to ±10V peak
• Automatic electronic report generation (Word format)
• Dual frequency measurement systems with linear and logarithmic scaling
• Automatic data analysis with phase comparison (A, B, C)
• Winding deformation assessment with four-level classification
• Compliant with DL/T911-2004 technical standards

Product Parameters

Application Scenarios

FAQ

Question 1: What main functions can this portable SFRA sweep frequency response analyzer realize?
Manufacturer: This SFRA sweep frequency response analyzer is professional testing equipment for evaluating transformer winding mechanical condition. It injects swept‑frequency excitation signal and records frequency‑response characteristic curve. It can identify winding deformation, displacement, distortion, inter‑turn short‑circuit and iron‑core looseness. The matched PC software supports curve overlay comparison, data storage, report generation and file export. It is widely adopted for transformer factory inspection, substation hand‑over acceptance, periodic preventive maintenance and post‑short‑circuit‑fault diagnosis.
Question 2: What preparation work should be completed before performing SFRA sweep frequency response test on site?
Manufacturer: The transformer must be fully de‑energized and reliably grounded. Disconnect all external connecting leads on high‑voltage and low‑voltage bushings to avoid interference from external loops. Clean dirt and oxidation on bushing terminals for stable signal contact. Properly ground the analyzer main unit. Install the supporting analysis software on the laptop, inspect test cables and alligator clips for damage. Complete wiring strictly following operation requirements before launching formal measurement.
Question 3: Why do multiple measured SFRA curves show poor repeatability and obvious deviation?
Manufacturer: Unstable test curves are mainly caused by poor contact or external electromagnetic interference. Check whether test alligator clips are firmly fastened on bushing terminals and remove surface contaminants. Keep signal test cables far away from high‑voltage facilities and large metal components. Make certain all external wires of transformer are fully disconnected. Reboot hardware and perform retest. If curves are still inconsistent, check for breakage or aging of signal cables.
Question 4: How to analyze SFRA test curves and judge transformer potential winding faults?
Manufacturer: Compare the newly‑measured curve with original factory curve or historical reference curve. Pay attention to amplitude deviation and resonance peak‑valley offset in different frequency ranges. Obvious shift of resonance peaks and valleys generally indicates winding mechanical deformation. Abnormality in low‑frequency band is mostly related to iron‑core conditions, while changes in mid‑high frequency band mainly reflect winding displacement or distortion. Make comprehensive assessment combining other transformer test results instead of drawing conclusions merely from SFRA curve.
Question 5: What important safety and operation notes should be observed during SFRA testing?
Manufacturer: Never carry out SFRA test on live transformer. Ensure reliable grounding of host equipment all through the test process. Do not bend or trample signal test cables to prevent internal wire breakage. Keep the laptop away from strong electromagnetic field. After finishing test, save curve data before powering‑off equipment. If abnormal curve appears, re‑check wiring status rather than directly judging transformer fault. Do not modify original reference curve data artificially for fault comparison.
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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