GDRB-F Transformer Winding Deformation Tester (SFRA & Impedance Method)
● Acquisition and control using high-speed, highly integrated microprocessor.
● Communication USB interface used between the laptop and instrument.
● Hardware adopts dedicated DDS digital high-speed scanning technology (USA), which can accurately diagnose the faults like winding distorted, bulged, shift, tilt, inter-turn short-circuit deformation and inter-phase contact short-circuit.
● High-speed dual-channel 16-bit A/D sampling (in field test, move tap changer, and the wave curve shows obvious changes).
● Signal output amplitude is adjusted by software, and the peak value of amplitude is ± 10V.
● The computer will automatically analyze the test results and generate electronic documents (Word).
● The instrument has dual measurement features: linear frequency scanning measurement and segment frequency scanning measurement, compatible with measurement mode of two technical groups in China.
● The amplitude-frequency characteristics are in line with the national technical specifications on amplitude-frequency characteristics tester. X-coordinate (frequency) has linear indexing and logarithmic indexing, so the user can print out the curve with linear indexing and logarithmic indexing. The user can choose either according to actual needs.
● Automatic test data analysis system.
Horizontal comparison of winding similarity between three phases A, B and C
The results are as follows:
① Excellent consistency
② Good consistency
③ Poor consistency
④ Worse consistency
Longitudinal comparison A-A, B-B, C-C calls the original data and the current data in the same phase for winding deformation comparison
The analysis results are:
① Normal winding
② Mild deformation
③ Moderate deformation
④ Severe deformation
● Word electronic document can be automatically generated for saving and printing.
● The instrument can fully meet the technical requirements of electricity standard DL/T911-2004 "Frequency response analysis on winding deformation of power transformers".
Specification
Scan mode:
1. Linear scanning distribution
Scanning measurement range: (10Hz) - (10MHz) 40000 scanning point, resolution 0.25kHz, 0.5kHz and 1kHz.
2. Segment sweep frequency measurement distribution
Sweep frequency measurement range: (0.5kHz) - (1MHz), 2000 scanning points ;
(0.5kHz) - (10kHz)
(10kHz) - (100kHz)
(100kHz) - (500kHz)
(500kHz) - (1000kHz)
Other technical parameters:
1. Amplitude measurement range: (-120dB) to (+20 dB);
2. Amplitude measurement accuracy: 1dB;
3. Sweep frequency accuracy: 0.005%;
4. Signal input impedance: 1MΩ;
5. Signal output impedance: 50Ω;
6. Signal output amplitude: ± 20V;
7. In-phase test repetition rate: 99.9%;
8. Measuring instruments dimensions (LxWxH): 340X240X210 (mm);
9. Instrument’s aluminum box dimension (LxWxH): 370X280X260 (mm); Wire box aluminum alloy box (LxWxH) 420X300X300 (mm);
10. Overall weight: 10kg;
11. Working temperature: -10℃~+40℃;
12. Storage temperature: -20℃~+70℃;
13. Relative humidity: <90%, Non-condensing;
