Transformer Sweep Frequency Response Analyzer

The MOEORW-W4210 Transformer Winding Deformation Comprehensive Tester employs dual detection technologies : frequency response method (SFRA/FRA) and low-voltage short-circuit impedance method . It can non-destructively diagnose deformation faults in power transformer windings, such as twisting, bulging, displacement, and inter-turn/phase-to-phase short circuits, meeting the requirements of power standards such as DL/T911 and DL/T1093. The instrument consists of a main unit and a laptop computer forming a high-precision measurement system. It supports fully automatic measurement, intelligent curve analysis, and automatic generation of Word reports. It is suitable for factory acceptance testing, pre-commissioning testing, post-short-circuit diagnosis, and periodic preventative testing of 63kV to 500kV transformers. On-site installation and removal of the protective cover are unnecessary, resulting in efficient testing and accurate results.

1.The data acquisition and control system employs a high-speed, highly integrated microprocessor.
2.USB interface for communication between laptop and instrument.
3.The hardware mechanism adopts DDS dedicated digital high-speed frequency sweep technology (USA), which can accurately diagnose faults such as winding twisting, bulging, displacement, tilting, inter-turn short circuit deformation and phase-to-phase contact short circuit through testing.
4.High-speed dual-channel 16-bit A/D sampling (field test showed a significant change in waveform curve after changing the tap changer).
5.The signal output amplitude is adjustable by software, with a maximum peak amplitude of ±10V.
6.The computer will automatically analyze the test results and generate an electronic document (Word).
7.The instrument has dual measurement system functions of linear sweep frequency measurement and segmented sweep frequency measurement, and is compatible with the measurement modes of the two current domestic technical schools.
8.The amplitude-frequency response meets the national technical specifications for amplitude-frequency response testers. The horizontal axis (frequency) has both linear and logarithmic scales, so the printed curve can be either a linear or logarithmic scale curve, which the user can choose according to their actual needs.

9.Automatic Analysis System for Detection Data

Lateral comparison of winding similarity among phases A, B, and C.
The analysis results are as follows:
① Excellent consistency
② Good consistency
③ Poor consistency
④ Poor consistency
A longitudinal comparison of AA, BB, and CC is performed to compare the winding deformation between the original data and the current data in phase.
The analysis results are as follows:
① Normal winding
② Slight deformation
③ Moderate deformation
④ Severe deformation
10.It can automatically generate Word documents for saving and printing.
11.The instrument fully meets the technical requirements of the power standard DL/ T911-2004 "Frequency Response Analysis Method for Winding Deformation of Power Transformers".

• Factory/Commissioning Acceptance: Before leaving the factory or being put into operation, the winding deformation of 110kV and above transformers shall be tested and the original data shall be retained.
• After a short-circuit fault, the transformer is subjected to an outlet/near-zone short-circuit impact, and the windings are quickly assessed for deformation.
• During regular preventative testing, the transformer is inspected periodically according to regulations to assess the health status of the windings.
• The overhaul/handover testing of transformers, the integrity of the winding structure is verified during the overhaul, installation, and handover process.
• Rapid on-site testing of substations using non-destructive testing methods, eliminating the need for hoisting or disassembly, and quickly completing the test.
• such as winding twisting, bulging, displacement, and inter-turn/inter-phase short circuits.