Deformation Tester
1. Product Application Scope
Deformation Tester This product quantifies the response changes of transformer internal winding parameters in different frequency domains, and based on the magnitude of the change, the amplitude of frequency response variation, the region, and the trend of frequency response changes, it determines the degree of deformation of the transformer internal winding. Furthermore, based on the measurement results, it can determine whether the transformer has been severely damaged and whether major repair is needed.
2. Main Technical Features of the Product
☆ Acquisition control uses high-speed, highly integrated microprocessor.
☆ USB communication interface between PC and instrument.
☆ The hardware mechanism uses DDS dedicated digital high-speed frequency sweep technology (from the USA). Through testing, it can accurately diagnose faults such as winding distortion, bulging, displacement, tilting, inter-turn short circuit deformation, and phase-to-phase short circuit.
☆ High-resolution dB value measurement, dual-channel 16-bit A/D (on-site test changing the tap changer will show obvious output changes).
☆ The signal output amplitude can be adjusted by software, with maximum amplitude peak of ±10V.
☆ The computer generates electronic documents (WORD) from the test results.
☆ Selected precision, high-stability components; for repeated tests on the same phase, the measurement repeatability is above 99.5%.
☆ Finished circuit board with special surface treatment, resistant to water and harmful gas pollution.
☆ The laptop and measuring instrument are powered by isolated power supply to eliminate external interference.
☆ The instrument has dual measurement system functions: linear frequency sweep measurement and segmented frequency sweep measurement, compatible with the measurement modes of the two current domestic technical schools.
☆ The amplitude-frequency characteristics comply with the national technical indicators for amplitude-frequency characteristic testers. The horizontal axis (frequency) has both linear and logarithmic scales, so the printed curves can be either linear or logarithmic, depending on the user's actual needs.
☆ Automatic analysis system for test data: horizontal comparison of winding similarity among phases A, B, and C, with results: ① Very good consistency ② Good consistency ③ Poor consistency ④ Very poor consistency; vertical comparison of A-A, B-B, C-C by retrieving original data and comparing with current data for the same phase to assess winding deformation, with results: ① Normal winding ② Slight deformation ③ Moderate deformation ④ Severe deformation.
☆ Automatically generates Word electronic documents for storage and printing.
☆ Fully meets the technical conditions of the power standard DL/T911-2004 "Frequency Response Analysis Method for Power Transformer Winding Deformation".
Winding Deformation Tester for Power Transformer Testing
3. Product Technical Parameters:
◇ Amplitude measurement range: (-100dB)–(+20dB)
◇ Amplitude measurement accuracy: 0.1dB
◇ Sweep frequency accuracy: less than 0.01%
◇ Signal input impedance: 1MΩ
◇ Signal output impedance: 50Ω
◇ Same-phase test repeatability: 99.5%
