Sfra Transformer Sweep Frequency Response Analyzer Sfra Test Set

• After-sales Service: Lifetime Technical Support
• Warranty: 1 Year for Sfra Transformer Sweep Frequency Respon
• Item: Sfra Transformer Sweep Frequency Response Analyzer
• Test Standard: IEC60076
• Sweep Modes: Linear Sweep/Section Sweep
• Test Range): (-100dB) - (+20dB
• Model NO.: GDRZ-903
• Reactive Power: 0.2%±2 Digits
• Frequency: 45-65Hz 0.1%
• Transport Package: Packed in Container
• Specification: packing in 2 cases
• Trademark: GOLD
• Origin: Chongqing
• HS Code: 9031809090
• Production Capacity: 100PCS/Month Hipot Tester

Product Description

SFRA Transformer Sweep Frequency Response Analyzer SFRA Test Set

Product Description

Sweep frequency response analysis (SFRA) is a method to evaluate the mechanical integrity of core,windings and clamping structures within power transformer by measuring their electrical transfer functions over a wide frequency range.GDRZ-903 Transformer Sweep Frequency Response Analyzer can use two methods to detect the deformation of the transformer at the same time. One is the sweep frequency response analysis method, the other is low-voltage short-circuit impedance analysis method. Using two methods can effectively reduce incorrect judgments.

When is SFRA performed?

The Sweep Frequency Response Analyzer (SFRA) injects a range of frequencies into a power transformer winding. If the transformer is built correctly with no imperfections or faults, the resulting frequency response plot of Gain Vs Frequency should exhibit a distinct shape that becomes the transformer's "fingerprint" for that particular winding and transformer type.

This "fingerprint" can be used over the transformer's lifespan to detect any degradation. By comparing the current SFRA test results to the initial "fingerprint," any changes in the transformer's condition can be identified and addressed before they worsen. This allows for proactive maintenance and can help extend the transformer's lifespan.

Main occasions when SFRA is performed
1. Upon factory quality checking
2. Before a short circuit test
3. Before and After transportation
4. Ongoing scheduled maintenance
 

Product Parameters

Sweep Frequency Response Method  Two different sweep modes
Linear sweep	10HZ-1MHZ,interval 0.5KHZ, 2000 dots; 100HZ-2MHZ,interval 0.5KHZ,2000 dots; 10HZ-1MHZ, interval 0.25KHZ,4000 dots (PC available) 100KHZ-2MHZ,interval 0.25KHZ,4000 dots(PC available) Frequency, interval, and scan dots can be set(PC available)
Section sweep	10HZ-100HZ,interval 1HZ,90 dots; 100HZ-1KHZ,interval 5HZ ,180 dots; 1KHZ-10KHZ ,interval 50HZ,180 dots; 10KHZ-100KHZ, interval 0.2KHZ,450dots; 100KHZ-300KHZ ,interval 0.5KHZ,400dots; 300KHZ-1000KHZ ,interval 1KHZ,700dots
Test range	(-100dB) - (+20dB)
Test accuracy	(-80dB) - (+20dB) 0.2dB (-100dB) - (-80dB) 1.0dB
Frequency accuracy	< 0.01%
Signal input impedance	> 1M Ω
Signal output impedance	50 Ω
In-phase test repetition rate	99.5%
Short-circuit Impedance and Generator Rotor AC Impedance
AC impedance	0-999.999Ω 0.2%±2 digits
AC voltage	0-600V 0.2%±2 digits
AC ampere	0-120A 0.2%±2 digits
Active power	cosφ>0.1  0.5%±2 digits cosφ<0.1  1.0%±2 digits
Reactive power	0.2%±2 digits
Frequency	45-65HZ 0.1%

 

Working principle

List of accessories