ST-RX2000电力变压器Winding Deformation Tester-扬州达瑞

Detailed Introduction

The power transformer winding deformation tester, based on the measurement of internal winding characteristic parameters of the transformer, adopts the internal fault frequency response analysis (FRA) method currently being developed and perfected in developed countries, enabling accurate judgment of internal transformer faults.

After the transformer design and manufacturing are completed, its coils and internal structure are determined. Therefore, for a multi-winding transformer coil, if the voltage level is the same and the winding method is the same, the corresponding parameters (Ci, Li) of each coil should be determined. Thus, the frequency domain characteristic response of each coil is also determined, and the frequency spectra of the corresponding three-phase coils have a certain comparability.

    During testing, if inter-turn or phase-to-phase short circuits occur, or if the transformer suffers impact during transportation causing coil displacement, or if electromagnetic forces during short circuits and fault conditions in operation cause coil deformation, the distributed parameters of the transformer winding will change. This in turn affects and alters the original frequency domain characteristics of the transformer, such as amplitude changes in frequency response and shifts in resonance frequency points. The HX021 transformer winding frequency response tester, developed based on response analysis methods, is a novel non-destructive testing device for internal transformer faults. It is suitable for detecting internal structural faults in power transformers from 63kV to 500kV.

    The transformer winding deformation frequency response tester quantifies the response changes of internal winding parameters in different frequency domains. Based on the magnitude of change, the amplitude and region of frequency response change, and the trend of frequency response change, it determines the degree of internal winding deformation, thereby judging whether the transformer has been severely damaged and whether major repair is needed.

    For transformers in operation, even if no previous frequency domain characteristic graphs are saved, by comparing the differences in characteristic spectra between faulty transformer coils, the degree of fault can also be assessed. Of course, if a set of original winding characteristic graphs is preserved, it provides a stronger basis for analyzing the transformer's operating condition, post-accident analysis, and maintenance.

    The transformer winding deformation frequency response tester consists of a laptop and a microcontroller forming a high-precision measurement system. It is compact, easy to operate, and has relatively complete testing and analysis functions. It can be operated by following the user manual or after short-term training.

Power Transformer Winding Deformation Tester, Transformer Winding Deformation Detector, Transformer Winding Deformation Measuring Instrument, Transformer Winding Deformation Analyzer

◆ The acquisition control adopts a high-speed, highly integrated microprocessor.

◆ USB communication interface between PC and instrument.

◆ The hardware core uses DDS dedicated digital high-speed frequency sweep technology (USA). Through testing, it can accurately diagnose faults such as winding distortion, bulging, displacement, tilting, inter-turn short circuit deformation, and phase-to-phase contact short circuit.

◆ High-resolution dB value measurement, dual-channel 16-bit A/D (on-site test changing tap changer results in obvious output changes).

◆ Signal output amplitude can be adjusted via software, maximum amplitude peak ±10V.

◆ The computer generates electronic documents (WORD) from test results.

◆ Using precision, high-stability components, repeated tests on the same phase yield a measurement repeatability of over 99.5%.

◆ Finished circuit boards with special surface treatment, resistant to water and harmful gas contamination.

◆ The laptop and measuring instrument are powered by isolated power supplies to eliminate external interference.

◆ The instrument features dual measurement systems: linear frequency sweep measurement and segmented frequency sweep measurement, compatible with the two current technical schools in China.

◆ The amplitude-frequency characteristics comply with 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, as per user needs.

◆ Automatic data analysis system for test data, performing horizontal comparison of winding similarity among phases A, B, and C, with results: ① Excellent 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 current data for same-phase winding deformation comparison, with results: ① Normal winding ② Mild deformation ③ Moderate deformation ④ Severe deformation.

◆ Automatically generates Word electronic documents for saving and printing.

◆ Fully meets the technical conditions of the power standard DL/T911-2004 "Frequency Response Analysis Method for Power Transformer Winding Deformation".

3.1 Sweep Mode: (The instrument has dual measurement systems: linear sweep and segmented sweep)

  (1) Linear Sweep Distribution

           Sweep frequency range: (1kHz)-(2MHz), 2000 sweep points, resolution 1kHz

  (2) Segmented Sweep Distribution 

           Sweep frequency range: (0.5kHz)-(1MHz), 2000 sweep points;

(0.5kHz)-(10kHz), resolution 0.02kHz

(10kHz)-(100kHz), resolution 0.2kHz

(100kHz)-(500kHz), resolution 1kHz

(500kHz)-(1000kHz), resolution 1kHz

3.2 Other Technical Parameters:

◆ Amplitude measurement range: (-100dB) to (+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%

◆ Measuring instrument dimensions (LWH): 345X250X120 (mm)

◆ Instrument aluminum alloy case dimensions (LWH): 425X335X215 (mm)

◆ Instrument accessory aluminum case dimensions (LWH): 425X335X150 (mm)

◆ Total weight: 10Kg