Transformer Sweep Frequency Response Analysis (SFRA): A Key to Ensuring the Reliability of Power Supply Systems
Transformers are important components in power grids, and their reliability directly affects the performance of electrical systems. As an advanced method for assessing the condition of transformers, sweep frequency response analysis (SFRA) uses this non-invasive diagnostic technique to gain detailed insights into the mechanical and electrical condition of transformer windings and cores.
During SFRA testing, a series of low-voltage sinusoidal signals are applied to the transformer windings, with responses measured at various frequencies. By analysing the frequency response, engineers can detect issues such as winding deformation, displacement, or core irregularities. These subtle changes may go undetected in routine testing but could indicate potential faults. By conducting regular SFRA testing, utility companies and industrial enterprises can proactively schedule maintenance, minimise downtime, and extend the service life of transformers.
At Goldhome Hipot, we provide clients with reliable diagnostic solutions for energy equipment. Our testing apparatus facilitates precise SFRA measurements, enabling professionals to ensure transformer integrity and operational safety. Whilst SFRA requires expert evaluation, it is widely recognised for its ability to detect early-stage faults.
The KVRZ-S SFRA Analyser, developed by Goldhome Hipot, employs advanced American DDS digital high-speed scanning technology to deliver comprehensive fault diagnosis, including winding deformation, bulging, displacement, skewing, inter-turn short circuits, and phase-to-phase contact issues. Unlike conventional testers, this device offers dual scanning modes compliant with Chinese national technical standards-linear scanning and segmented frequency scanning-covering a frequency range from 0.5kHz to 10MHz. It achieves ultra-high resolution with up to 40,000 scan points. 'Our new SFRA solution marks a significant breakthrough in the field of predictive maintenance for power transformers,' stated Mr.Li, Chief Executive Officer of Goldhome Hipot. 'Currently, 9,078 customers worldwide have adopted this technology.'
During a recent field deployment at a 220 kV substation in central China, KVRZ-S equipment successfully detected axial displacement in the low-voltage winding of a 160 MVA transformer-a problem that had not been detected previously using conventional DC resistance and dielectric loss factor tests. Subsequent internal inspections confirmed the problem, allowing targeted maintenance measures to be carried out and preventing a potentially catastrophic failure. Rick Jason, the substation manager involved in the project, explained: "Goldhome Hipot's SFRA devices saved us over $500,000 in downtime and equipment replacement costs with their precision."
Goldhome Hipot's investment in SFRA technology underscores the company's commitment to research and development, which is based on decades of experience.
Goldhome Hipot's investment in SFRA technology is consistent with its commitment to research and development, which is supported by a ten-member technical team and collaborative partnerships with leading universities. The company's 10,000-square-meter production facility ensures strict quality control, with all products undergoing third-party calibration and factory acceptance testing prior to shipment.
