3-Phase Anti-interference Transformer Sweep Frequency Response Analyzer with Harmonic Analysis
Product Description
3-Phase Anti-interference Transformer Sweep Frequency Response Analyzer with Harmonic Analysis
After transformers are subjected to short-circuit impacts, transportation relocation, and long-term aging, hidden dangers such as winding displacement, core loosening, and tap changer malfunctions are extremely difficult to detect. Traditional on-site testing often requires multiple instruments: sweep frequency winding deformation testers, no-load load testers, and generator rotor impedance testers operate separately. This involves a large amount of equipment handling, repeated wiring changes, long testing cycles, and inconsistent data formats from different devices, resulting in significant manpower costs for report compilation.
GDRZ-903 Transformer Sweep Frequency Response Analyzer supports both three-phase and single-phase testing modes. In case of abnormal three-phase data, it can switch to single-phase mode to accurately locate the faulty phase. It features built-in automatic temperature and frequency correction algorithms, eliminating the need for manual formula conversion.
It boasts a color touchscreen human-machine interface, built-in high-speed thermal printing, and USB connection to host computer software, allowing test data to be directly exported to Word and Excel format test reports.
Its lightweight enclosure design makes it suitable for various scenarios, including transformer factory laboratories, substation overhaul sites, EPC overseas projects, and third-party testing agencies, reducing the burden of carrying multiple devices on-site.
Product features
1.Six-in-one integrated test platform
This system integrates sweep frequency winding deformation (SFRA), short-circuit impedance, no-load load loss, zero-sequence impedance, generator rotor AC impedance, and harmonic testing into a single main unit.
2.Dual-mode test logic
It simultaneously supports three-phase overall testing and single-phase individual testing. The three-phase mode quickly screens the entire device; when three-phase imbalance exceeds tolerance, switching to single-phase mode allows for phase-by-phase testing, directly pinpointing the faulty winding. This overcomes the limitation of ordinary instruments that can only measure all three phases and cannot distinguish which phase is abnormal. It supports multiple winding connection group settings (Yn/Y/Δ/Z) and is compatible with two-winding and three-winding transformers.
3.Built-in intelligent correction algorithm
After testing, temperature and frequency correction can be performed directly on the main unit interface. Inputting the measured winding temperature and reference standard temperature, and distinguishing between copper and aluminum winding materials, the instrument automatically calculates impedance and loss parameters, eliminating the need for manual table lookups by the testing personnel. Voltage distortion is automatically monitored, meeting the requirements for validating no-load test waveforms.
4.Accommodates both national and international standards
Built-in multiple segmented scanning schemes, covering DL/T911-2016 linear interval scanning and IEC60076-18 segmented scanning, with a maximum frequency of 10MHz; synchronous acquisition of amplitude and phase; repeatability of in-phase repeatable testing up to 99.5%, ensuring the reliability of winding deformation comparison curves.
5.Universal for transformers of all sizes
This machine directly measures AC 0-600V, 0-120A; for ranges exceeding this, external PTs and CTs can be connected. Large-capacity transformer testing can be completed simply by directly inputting the turns ratio parameters, without hardware modification. One machine can cover both large and small capacity samples.
6.Complete closed-loop data management
The machine's non-volatile memory stores multiple sets of test records; on-site thermal printing of paper reports; USB direct connection to a computer, with host computer software enabling online control of testing; raw data can be directly exported to editable Word/Excel reports; each record includes a timestamp, ensuring traceability of test data; freely switchable between Chinese and English interfaces.
7.Industrial-grade portable hardware
The lightweight enclosure weighs only 12kg, making it easy to move; the full-color touchscreen and operation menu are designed to suit the habits of power testing personnel; and the comprehensive wiring diagrams are embedded in the instruction manual, allowing for on-site reference to complete various wiring procedures, including single-phase, three-phase, and transformer external connections.
Test menu
corresponding test window
Product Parameter
| Item | Specifications |
|---|---|
| Sweep Frequency Response Analysis(SFRA) | Scan range:10Hz‑10MHz, multiple scanning modes for DL/T911‑2016 & IEC60076‑18Amplitude range:‑100dB ~ +20dB；Phase range:‑180°~+180°Frequency accuracy:＜0.01%；In‑phase repeatability:99.5%Max output amplitude:20Vpp；Output impedance:50Ω |
| Impedance / No‑load / Load Test | Direct measuring range: AC 0‑600V，AC 0‑120AFrequency range:45‑65HzVoltage & Current accuracy:＜0.2% reading ±2digitsActive power: cosφ＞0.1 error＜0.5% reading ±2digits；cosφ＜0.1 error＜1.0% reading ±2digitsReactive power error＜0.2% reading ±2digits；Power factor error＜0.5% reading ±2digitsSupport external PT / CT for range extension |
| Generator Rotor AC Impedance | Max test points:50；Sampling by voltage / current step optional；Generate impedance characteristic curve |
| Harmonic Measurement | Simultaneous 3‑phase voltage & current acquisition，Up to 128‑th harmonic analysis |
| Data Storage | Non‑volatile memory; Max 40 groups no‑load/load data, 30 groups rotor impedance data; local preview & thermal print |
| PC Communication | USB2.0 interface; PC software support online test, data import‑export, export Word / Excel report |
| Operation Interface | Color touch‑screen, Chinese / English menu switchable |
| Power Supply | AC220V±10%,45‑65Hz,power consumption ≤100W |
| Dimension & Weight | 520 × 290 × 220 mm; Approx.12 kg |
| Operating Condition | 0℃ ~ +50℃; Humidity ≤90%RH(non‑condensing) |
Product function
1. Frequency Sweep Response Analysis
Multiple scanning schemes support different standard scanning strategies of DL/T911-2016 and IEC60076-18, with a wide bandwidth output of 10Hz-10MHz.
Synchronously acquire amplitude-frequency and phase-frequency characteristic curves; the device can review and compare curves, and the host computer can perform longitudinal and lateral comparisons of multiple sets of historical fingerprint curves.
Automatically evaluate the winding deformation status, mark out-of-tolerance items, and use them to determine winding displacement, bulging, deformation, and core loosening faults.
2. Short-Circuit Impedance Test
Measures short-circuit impedance Zk, short-circuit reactance Xk, short-circuit resistance Lk, impedance voltage Zke%, power, power factor, and frequency – a complete set of parameters.
Supports three-phase rapid testing / single-phase phase-by-phase testing for precise phase location of abnormal phases; adaptable to different combinations of high-low, high-medium, and medium-low three-winding configurations.
One-click temperature and frequency calibration; provides judgment prompts according to IEC60076-5; test points can be set for automatic/manual sampling.
3. Transformer No-Load and Load Loss Testing
No-Load: No-load loss, no-load current, RMS and average voltage values; automatically calculates waveform distortion rate and judges the validity of the test waveform.
Load: Load loss, impedance voltage; supports temperature conversion for windings with different insulation classes.
Compatible with both oriented and non-oriented core materials; supports external PT/CT range extension; saves multiple sets of sampling point data for retrospective analysis.
4. Zero-Sequence Impedance Test
Used for measuring the zero-sequence impedance parameters of star-connected and Z-connected transformers; comprehensively records voltage, current, power, and impedance results to meet grounding characteristic assessment requirements.
5. Generator Rotor AC Impedance Test
Features two step sampling modes: voltage or current, with a maximum of 50 test points; automatically generates impedance-current characteristic curves; can save and print curve graphs; used to determine inter-turn short-circuit defects in rotor windings.
6. Harmonic Test
Simultaneously acquires three-phase voltage and three-phase current, resolving up to the 128th harmonic; used for on-site power quality and test power supply waveform quality assessment.
short-circuit impedance three-phase method test result window
Rotor AC impedance characteristic curve window
Product Applications
Transformer Manufacturing Plants: Complete type testing for new products, including factory verification of winding deformation, no-load and short-circuit impedance, and inspection of semi-finished product cover status.
Substation Operation and Maintenance: Diagnosis of transformers after short-circuit impacts; comparative testing before and after major overhauls; annual preventative testing; handover and acceptance testing, screening for potential winding displacement and core loosening.
Power Plants: Complete characteristic testing of main transformers; AC impedance testing of generator rotors, troubleshooting rotor inter-turn short-circuit faults.
Third-Party Testing Agencies: On-site comprehensive transformer testing, with one device covering multiple tests, improving efficiency of on-site operations; report formats meet CMA project archiving standards.
Domestic and International EPC Transmission and Transformation Projects: On-site testing of newly built, renovated, and expanded substations; bilingual (Chinese and English) operating interface; standardized and editable report output; suitable for overseas project inspection and approval.
Contact us
Contact Person: Christine Gou
Mobile/Whatsapp/Wechat: +86 15123029885
E-mail: gold05@hy-industry.com