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HF-TC-625 SFRA Sweep Frequency Response Analyzer
The Sweep Frequency Response Analyzer generates standard frequency response fingerprints for power transformers. By comparing measured waveforms with original data, it pinpoints winding distortion, coil displacement and invisible internal damage, serving as essential testing gear for substation asset maintenance.
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The HF-TC-625 Transformer Winding Deformation Tester (Frequency Response / SFRA Method) is designed for testing power transformers rated 6kV and above, as well as special customized transformers.
Transformers tend to suffer various defects during operation and transportation:
Large short-circuit current leads to inter-turn & inter-layer short circuits, while electromagnetic force causes winding shifting and deformation; bumps and vibration during transit also trigger relative displacement of winding coils. All these faults change winding impedance distribution and the shape of frequency response curves. By comparing horizontal, vertical and historical frequency response curves, engineers can accurately assess the severity of transformer winding deformation.
Large short-circuit current leads to inter-turn & inter-layer short circuits, while electromagnetic force causes winding shifting and deformation; bumps and vibration during transit also trigger relative displacement of winding coils. All these faults change winding impedance distribution and the shape of frequency response curves. By comparing horizontal, vertical and historical frequency response curves, engineers can accurately assess the severity of transformer winding deformation.
This instrument applies the sweep frequency response analysis principle for winding diagnosis. It supports dual power supply (mains + built-in lithium battery) and integrates measurement & display modules with keypad tone reminders. The dedicated PC software works with all Windows operating systems. User-friendly layout ensures easy and efficient field operation.
Main Product Advantages
- Complies strictly with DL/T911-2016 Standard: Frequency Response Analysis Method for Power Transformer Winding Deformation
- Dual power supply system: AC 100~240V universal mains (50/60Hz) + 7.5V 8Ah lithium battery. Mains power is prioritized; automatic switchover to battery occurs upon power failure. Full charge takes ~4 hours, supporting 9~15 hours continuous testing; optimized power management extends battery service life.
- All-in-one portable structure without cumbersome auxiliary parts; fast setup and simple operation for field inspections.
- Equipped with high-performance integrated MCU and advanced DDS direct digital frequency synthesis sweep technology.
- Dual-channel 16-bit high-speed synchronous AD sampling greatly accelerates testing efficiency.
- 8-inch adjustable-brightness resistive color touch screen for clear waveform viewing.
- Internal memory stores 210 groups (630 curves total) of test data for historical recall.
- USB interface available for data export to flash drives.
- Built-in Wi-Fi module supports wireless online testing and remote data upload.
- Upper computer software enables curve comparison analysis, data printing and editable Word test report export.
Complete Technical Specifications
Sweep Frequency Ranges
8 factory preset sweep modes plus fully customizable frequency parameters:
| No. | Frequency Range | Sampling Points | Frequency Step |
|---|---|---|---|
| a | 1kHz ~ 1MHz | 1000 | 1kHz |
| b | 1kHz ~ 2MHz | 2000 | 1kHz |
| c | 1kHz ~ 3MHz | 3000 | 1kHz |
| d | 500Hz ~ 1MHz | 2000 | 500Hz |
| e | 500Hz ~ 2MHz | 4000 | 500Hz |
| f | 100Hz ~ 1MHz | 1018 | 100Hz–1kHz: 50Hz step; 1kHz–1MHz: 1kHz step |
| g | 100Hz ~ 2MHz | 2018 | 100Hz–1kHz: 50Hz step; 1kHz–2MHz: 1kHz step |
| h | 100Hz ~ 3MHz | 3018 | 100Hz–1kHz: 50Hz step; 1kHz–3MHz: 1kHz step |
| i | Custom Range | 100 ~ 4000 adjustable | Step: 0.1kHz ~ 10kHz |
Electrical & Performance Parameters
| Item | Parameter Value |
|---|---|
| Maximum Excitation Output Voltage | AC 20V peak-to-peak |
| Excitation Output Impedance | 50 Ω |
| Sweep Frequency Accuracy | Class 0.01 |
| Reference & Response Input Impedance | ＞1 MΩ |
| Max Response Input Voltage | AC 50V peak-to-peak |
| Max Reference Input Voltage | AC 20V peak-to-peak |
| Amplitude Measurement Range | -100dB ~ +20dB |
| Amplitude Measurement Resolution | 0.1dB |
| Test Repeatability | 99.9% |
| Operating Ambient Temperature | -10 ℃ ~ 70 ℃ |
| Operating Humidity | ≤ 90% RH (non-condensing) |
Packing List：SFRA Sweep Frequency Response Analyzer
| Serial No. | Item Name | Quantity | Unit | Remarks |
|---|---|---|---|---|
| 1 | SFRA Analyzer Main Unit | 1 | Set | Complete host with built-in lithium battery, 8-inch touch screen |
| 2 | Excitation Test Lead Set | 1 | Set | Reference channel & response channel connecting cables |
| 3 | High Precision Test Clips | 4 | Pcs | Alligator clips for transformer winding connection |
| 4 | Wide Voltage AC Power Adapter | 1 | Pc | AC 100~240V, for charging and mains power supply |
| 5 | USB Flash Drive | 1 | Pc | Preloaded with upper computer analysis software |
| 6 | WiFi Antenna | 1 | Pc | For wireless data uploading & synchronization |
| 7 | English User Operation Manual | 1 | Copy | Detailed operation guide & parameter introduction |
| 8 | Factory Calibration Certificate & Test Report | 1 | Copy | Official certification for export & power industry acceptance |
| 9 | Shockproof Portable Aluminum Carry Case | 1 | Pc | Dustproof, anti-collision, convenient for outdoor field transportation |
FAQ for SFRA Sweep Frequency Response Analyzer
Q1: What is an SFRA Sweep Frequency Response Analyzer used for?
A: The SFRA Sweep Frequency Response Analyzer is a dedicated diagnostic instrument for transformer windings. It identifies winding deformation, displacement, loosening, short circuits and internal structural defects via frequency response curve comparison. It is widely used for substation preventive maintenance, post-fault inspection and transformer acceptance testing.
Q2: What types of transformers can this SFRA tester test?
A: It is suitable for 6kV and above power transformers, including oil-immersed, dry-type, distribution and special industrial transformers, covering routine maintenance and fault diagnosis of most power transformer equipment.
Q3: What is the working principle of SFRA testing?
A: The device outputs swept-frequency signals to transformer windings and collects response data. Winding deformation, displacement or structural changes will alter winding impedance and frequency response curves. Technicians can accurately evaluate winding operating status by analyzing curve amplitude and phase variations.
Q4: Does this SFRA device comply with international industry standards?
A: Yes. It strictly complies with DL/T911-2016 industry standard and meets mainstream IEC test specifications, delivering accurate, reliable test results for global project inspection and acceptance.
Q5: What frequency sweep ranges does this SFRA analyzer support?
A: It features 8 preset standard sweep modes (100Hz~3MHz) with adjustable sampling points and step values. Customizable frequency ranges are also supported to adapt to transformers of different capacities and diverse test scenarios.
Q6: Does the SFRA tester support dual power supply for field work?
A: It supports dual power supply (AC 100~240V mains + built-in lithium battery), with automatic power switching. Fully charged battery supports 9–15 hours of continuous testing, perfectly suited for outdoor substation field operations.
Q7: Can the instrument store test curves and export reports?
A: The tester locally stores 210 test groups (630 curve data). It supports data export via USB drive and WiFi wireless upload. Matching PC software enables curve analysis, data printing and one-click Word report generation.
Q8: What are the advantages of dual-channel sampling?
A: Adoptingdual-channel 16-bit high-speed synchronous AD sampling and advanced DDS frequency sweep technology, it ensures fast testing, stable signal acquisition and 99.9% test repeatability, effectively eliminating manual test errors.
Q9: Is the SFRA analyzer easy to operate for on-site engineers?
A: Very user-friendly. Equipped with an 8-inch adjustable-brightness color touch screen and key tone prompts, the all-in-one design requires no complex accessories. Intuitive operation allows engineers to complete tests quickly without professional training.
Q10: Can it work in high and low temperature environments?
A: It works stably at -10℃ to 70℃ with humidity ≤90% RH (non-condensing), adapting to harsh working environments of substations, power plants and outdoor construction sites.
Q11: Why do we need SFRA test after transformer short circuit or transportation?
A: Transformer short-circuit impact and transportation vibration easily cause invisible winding deformation and displacement that cannot be detected visually. SFRA testing effectively identifies hidden internal faults in advance, avoiding transformer burnout and operational risks.
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