MCBRZ-202 Transformer Winding Deformation Tester

Model: MCBRZ-202 Quantity: 1 set Manufacturer: Hubei MECI Electric Power Equipment Co., Ltd

Category: Transformer Testing

Keywords: MCBRZ-202 Transformer Winding Deformation Tester

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Product Overview

The MCBRZ-202 Transformer Winding Deformation Tester performs measurements of the characteristic parameters of a transformer’s internal windings and employs the Frequency Response Analysis (FRA) method—currently being developed and refined in technologically advanced countries worldwide—to accurately diagnose internal faults in transformers.

Once a transformer has been designed and manufactured, its windings and internal structure are fixed. Therefore, for a multi-winding transformer, if the voltage ratings and winding techniques are identical, the corresponding parameters (Ci and Li) for each winding should be well-defined. Consequently, the frequency-domain response characteristics of each winding are also determined, and the frequency spectra of the three-phase windings exhibit a certain degree of comparability.

During testing, if a transformer experiences turn-to-turn or phase-to-phase short circuits, or if it sustains impact damage during transportation resulting in relative displacement of the windings, or if electromagnetic tensile forces under short-circuit and fault conditions cause winding deformation during operation, the distributed parameters of the transformer windings will change. This, in turn, affects and alters the transformer’s original frequency-domain characteristics, leading to changes in the magnitude of the frequency response and shifts in the resonant frequency points. The transformer winding tester developed based on response analysis is precisely such an innovative non-destructive diagnostic device for internal faults in transformers. It is suitable for detecting internal structural faults in power transformers rated at 63 kV to 500 kV.

A transformer winding deformation tester quantifies the frequency-domain response changes of the internal windings and, based on the magnitude of these changes, the extent and characteristics of the frequency-response variations, as well as the trends in such variations, determines the degree of winding deformation. On this basis, the measurement results can be used to assess whether the transformer has sustained severe damage and whether a major overhaul is required.

For transformers in operation, even if no frequency-domain signature maps have been previously archived, the degree of fault can still be assessed by comparing the differences in the inter-winding signature spectra of the faulty transformer. Of course, having an established set of original winding signature maps for the transformer provides a more precise and robust basis for monitoring its operating condition, post-incident analysis, and maintenance and repair activities.

The transformer winding deformation tester is a high-precision measurement system comprising a laptop computer and a microcontroller unit. It features a compact design, simple operation, and comprehensive test-analysis capabilities, allowing users to operate it independently after consulting the user manual or undergoing brief training.

Product Features

1. The data acquisition and control system employs a high-speed, highly integrated microprocessor.

2. USB interface for communication between the laptop and the instrument.

3. The industrial PC is integrated with the measurement instrument, eliminating the need for a portable computer at the measurement site.

4. The hardware core employs DDS-specific high-speed digital frequency-sweeping technology (developed in the United States), which, through testing, can accurately diagnose faults such as winding distortion, bulging, displacement, tilting, inter-turn short circuits and deformation, as well as phase-to-phase contact short circuits.

5. High-speed, dual-channel 16-bit A/D sampling (field tests demonstrated significant waveform changes when the tap changer was adjusted).

6. Signal output amplitude is software-adjustable, with a maximum peak-to-peak amplitude of ±10 V.

7. The computer will generate an electronic document (Word) containing the test results.

8. The instrument features both linear sweep frequency measurement and segmented sweep frequency measurement modes, thereby supporting the two prevailing technical approaches currently used in China.

9. The amplitude-frequency characteristics comply with the national technical specifications for amplitude-frequency characteristic testers. The horizontal axis (frequency) supports both linear and logarithmic scales, allowing the printed curve to be either linear or logarithmic, as selected by the user according to actual needs.

10. Automatic data analysis system for testing,

Conduct a lateral comparison of winding similarity among phases A, B, and C.

The analysis results are:

① Very good consistency

② Good consistency

③ Poor consistency

④Very poor consistency,

Conduct a longitudinal comparison by aligning the original data with the current data for phases A-A, B-B, and C-C, and then compare the winding deformation.

The analysis results are:

① Normal winding

② Mild deformation

③ Moderate deformation

④ Severe deformation

11. Automatically generates Word electronic documents for saving and printing.

12. This instrument fully meets the technical requirements specified in the power industry standard DL/T 911–2004, “Frequency Response Analysis Method for Detecting Winding Deformation in Power Transformers.”

Technical Specifications

1. Linear Scanning Distribution

Sweep frequency measurement range: (1 kHz)–(2 MHz), 2,000 sweep points, resolution of 1 kHz.

2. Segmented Sweep Frequency Measurement Distribution

Sweep frequency measurement range: (0.5 kHz)–(1 MHz), with 2,000 sweep points;

(0.5 kHz)–(10 kHz)

(10 kHz)-(100 kHz)

(100 kHz)-(500 kHz)

(500 kHz)-(1000 kHz)

3.2 Other Technical Parameters:

1. Amplitude measurement range: (-100 dB) – (+20 dB)

2. Amplitude measurement accuracy: 0.1 dB

3. Scan frequency accuracy: less than 0.01%

4. Signal input impedance: 1 MΩ

5. Signal output impedance: 50 Ω

6. In-phase test repeatability: 99.5%

7. Dimensions of the measuring instrument (length × width × height): 300 × 340 × 120 mm

8. Instrument aluminum alloy case dimensions (length × width × height): 310 × 400 × 330 mm

◇Total weight: 10 kg

MCBRZ-202 Transformer Winding Deformation Tester

MCBRZ-202 Transformer Winding Deformation Tester

Model: MCBRZ-202 Quantity: 1 set Manufacturer: Hubei MECI Electric Power Equipment Co., Ltd

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Tel： 86-13307164232

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