Power Transformer Winding Deformation Tester Frequency Response Method Tester

• Customization: Available
• After-sales Service: Onsite and Remote Guidance
• Warranty: 1or 2 Years Free Warranty Longlife Service
• Model NO.: EPFR Series
• Max Diameter of Workpiece: <500mm
• Mass Scope of Workpiece: <900kg
• Type: Universal Testing Machine
• Accuracy Grade: 0.005%
• Display: LCD
• Control: Computer Control
• Weight: 100-500Kg
• Power Source: 110V or 220V at Customized
• Sweep Mode: Distribution of Linear Sweep
• Sweep Measurement Range: (10Hz)-(10MHz) 40000 Sweep Points
• Resolution: 0.25kHz, 0.5kHz and 1kHz
• Sweep Measurement Range2: (0.5kHz)-(1MHz) 2000 Sweep Points
• Amplitude Measurement Range: (-120dB)-(+20dB)
• Amplitude Measurement Accuracy: 0.1dB
• Accuracy of Sweep Frequency: 0.005%
• Signal Input Impedance: 1mohm
• Signal Output Impedance: 50ohm
• Signal Output Amplitude: +-20V
• in-Phase Test Repetition Rate: 99.9%
• Dimension: 370X300X170(mm)
• Operating Temperature: -10- +40
• Relative Humidity: <90%, Noncondensing
• Storage Temperature: -20- +70
• Transport Package: Plywood Case
• Specification: Customized
• Trademark: EP Hipot Electric
• Origin: Wuhan, China
• HS Code: 9030339000
• Production Capacity: 1000/Year

Product Description

SFRA Transformer Sweep Frequency Response Analyzer EPFR-80
China Wuhan Transformer Winding Deformation Tester SFRA EP Hipot Electric

General Information:
Sweep frequency response analyzer (SFRA) also called Power transformer winding deformation tester (frequency response method), is based on the measurement of characteristic parameters of transformer internal windings, adopts the internal fault frequency response analysis (FRA) method, can accurately judge the internal faults of transformers. After the completion of design and manufacture of transformers, the coils and internal structure are finalized, so for the coil of a multi-winding transformer, if the voltage level and winding method are the same, the corresponding parameters (Ci, Li) of each coil shall be determined. Therefore, the frequency characteristics response of each coil also will be determined, so the frequency spectrums of the corresponding coils of three phases are comparable. During the test of transformer, in case of inter-turn, inter-phase short circuit, or relative coil displacement caused by collisions during transport, as well as coil deformation resulted from electromagnetic tension during operation under short circuit and fault conditions, the distribution parameters of transformer windings will change, which thereby in turn affects and changes the transformers' original frequency domain characteristics, namely the frequency response change in magnitude and the resonant frequency points shift. The transformer winding tester developed according to the response analysis method is the novel NDT equipment for detecting transformer internal fault. It applies to the detection of internal structure fault in 63kV-500kV power transformers. Transformer winding deformation tester is to determine the degree of changes in internal windings of the transformer based on the quantity of change, magnitude and region affecting change and tendency of frequency response change which are quantized from the response changes in different frequency domains of transformer's internal winding parameters, and then it can help you determine whether the transformer has been severely damaged, or need a major overhaul in accordance with the measurement results. For the transformer in operation, no matter whether the frequency domain characteristic drawing is saved, by comparing the differences between the inter-coil characteristic spectra of faulted transformer, it can determine the extent of the failure as well. Of course, if you have saved the original transformer windings feature drawings, it will be simpler to provide a precise basis for operating conditions, post-fault analysis and maintenance overhaul of the transformer. Transformer winding deformation tester is constituted by a laptop computer and micro controller forming a precision measurement system with the compact structure, easy operation, with more complete test analysis function, which can be operated referring to the instruction manual or through short-term training.

Main technical features:
 

• The acquisition and control adopts high-speed, highly integrated microprocessor.
• Use industrial computer and measuring instrument integration, no need to use mobile computer at the measuring site.
• The hardware movement adopts DDS special digital high-speed frequency sweeping technology (USA). Through testing, it can accurately diagnose faults such as twisting, bulging, shifting, tilting, inter-turn short-circuit deformation, and inter-phase contact short-circuit.
• High-speed dual-channel 16-bit A/D sampling (the tap switch is changed in the field test, and the waveform curve has obvious changes).
• The signal output amplitude is adjusted by software, the maximum amplitude peak value is ±10V.
• The computer generates an electronic document (Word) from the test results.
• The instrument has the dual measurement system functions of linear frequency sweep measurement and segmented frequency sweep measurement.
• The amplitude-frequency characteristics conform to the national technical indicators of the amplitude-frequency characteristics tester. The abscissa (frequency) has two kinds of linear division and logarithmic division, so the printed curve can be a linear division curve or a logarithmic division curve, and the user can choose according to actual needs.
• Test data automatic analysis system

Technical Specifications:

Scanning method
Linear scan distribution	Sweep frequency measurement range: (10Hz)-(10MHz) 40000 sweep frequency points, resolution of 0.25kHz, 0.5kHz and 1kHz.
Sectional sweep frequency measurement distribution	Sweep frequency measurement range: (0.5kHz)-(1MHz), 2000 sweep frequency points (0.5kHz)-(10kHz) (10kHz)-(100kHz) (100kHz)-(500kHz) (500kHz)-(1000kHz)
Amplitude measurement range	(-120dB) to (+20dB)
Amplitude measurement accuracy	0.1dB
Sweeping frequency accuracy	0.005%
Signal input impedance	1MΩ
Signal output impedance	50Ω
Signal output amplitude	±20V
In-phase test repetition rate	99.9%
Measuring instrument size	(length, width and height) 370X300X170(mm)
Carry case size	(length, width and height) 420X300X300 (mm)
Total weight	17Kg

Please contact EP Hipot Electric for more details on SFRA EPFR series Transformer Sweeping Frequency Response Analyzer.