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

ST-RX2000 Transformer Winding Deformation Tester

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Product Introduction

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

◆ USB communication interface between PC and instrument.

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

◆ 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 by software, with maximum amplitude peak ±10V.

◆ The computer generates an electronic document (WORD) from the test results.

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

◆ The finished circuit board has a special surface treatment to resist water and harmful gas pollution.

◆ The laptop and measuring instrument are powered by isolated power supplies 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 curve can be either a linear scale curve or a logarithmic scale curve, and users can choose according to actual needs.

◆ Automatic analysis system for test data, horizontal comparison of winding similarity between phases A, B, and C, with results: ①Very good consistency ②Good consistency ③Poor consistency ④Very 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: ①Normal winding ②Mild deformation ③Moderate deformation ④Severe deformation.

◆ Automatically generate Word electronic documents for storage and printing.

◆ Fully meet 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 both linear frequency sweep measurement and segmented frequency sweep measurement systems)

  (1) Linear sweep distribution

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

  (2) Segmented sweep measurement distribution 

           Sweep frequency measurement 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)–(+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 (length x width x height): 345X250X120 (mm)

◆ Instrument aluminum alloy case dimensions (length x width x height): 425X335X215 (mm)

◆ Instrument accessory aluminum alloy case dimensions (length x width x height): 425X335X150 (mm)

◆ Total weight: 10Kg

 

Detailed Introduction

The transformer winding deformation tester, based on the measurement of internal winding characteristic parameters of the transformer, uses 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 is designed and manufactured, 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 the test, if inter-turn or phase-to-phase short circuits occur, or if the transformer is impacted 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 changes the original frequency domain characteristics of the transformer, i.e., the frequency response undergoes amplitude changes and resonance frequency shifts. The HX021 transformer winding frequency response tester, developed based on the response analysis method, is such a novel non-destructive testing device for internal transformer faults. It is suitable for detecting internal structural faults in 63kV to 500kV power transformers.

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

    For transformers in operation, regardless of whether frequency domain characteristic graphs have been saved in the past, by comparing the differences in characteristic spectra between faulty transformer coils, the degree of fault can also be judged. Of course, if a set of original winding characteristic graphs of the transformer is saved, it is easier to provide a more powerful basis for the transformer's operating status, post-accident analysis, and maintenance.

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

Note: The above information and technical parameters are compiled and released by Yangzhou Darui Electric Co., Ltd.