GHBRZ Transformer Winding Deformation Tester

Transformer winding deformation tester product introduction:

Yangzhou Guohua Electric Co., Ltd. specializes in the research and development of power testing equipment. The transformer winding deformation tester produced by the company experiences inter turn and inter phase short circuits during the testing process, or collisions during transportation, resulting in relative displacement of the coil. In addition, coil deformation caused by electromagnetic tension in short circuits and fault states during operation can change the distribution parameters of the transformer winding, thereby affecting and altering the original frequency domain characteristics of the transformer, such as amplitude changes in frequency response and harmonic frequency point shifts. The GHBRZ transformer winding frequency response tester developed based on response analysis method is a novel non-destructive testing equipment for internal faults of transformers. It is suitable for internal structural fault detection of 63kV-500kV power transformers.

The transformer winding deformation frequency response tester quantifies the response changes of the internal winding parameters of the transformer in different frequency domains. Based on the magnitude of the changes, the amplitude and region of the frequency response changes, and the trend of the frequency response changes, the internal winding degree of the transformer can be determined. Then, the measurement results can be used to determine whether the transformer has been severely damaged and whether major repairs are needed.

Another name for transformer winding deformation tester:

Transformer winding deformation tester, also known as power transformer winding deformation tester, transformer winding deformation detector, transformer winding deformation measuring instrument, transformer winding deformation analyzer

Main technical features of transformer winding deformation tester:

△ The acquisition control adopts high-speed and highly integrated microprocessors
△ USB communication interface between PC and instrument
The hardware core adopts DDS digital high-speed scanning technology, 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 14 bit A/D (on-site test shows significant output changes by changing the tap changer)
The output amplitude of the △ signal can be adjusted by software, with a maximum amplitude peak value of ± 10V
The computer generates a frequency response diagram based on the detection results
Select precision and high stability components, repeat tests on the same phase, and achieve a measurement repetition rate of over 99.5%
Laptops and measuring instruments are powered by isolated power sources to eliminate external interference
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 two current domestic technical schools
The amplitude frequency characteristics comply with the technical specifications of the national amplitude frequency characteristic tester. The horizontal axis (frequency) has logarithmic division, and the logarithmic division curve can be printed out. Users can print reports according to their actual needs
The automatic analysis system for △ detection data compares the winding similarity between phases A, B, and C horizontally, and the results are: 1. Good consistency, 2. Good consistency, 3. Poor consistency, 4. Poor consistency. Comparing the original data with the current data in phases A-A, B-B, C-C for winding deformation comparison, the results are: 1. Normal winding, 2. Mild deformation, 3. Moderate deformation, 4. Severe deformation
Technical Conditions for DL/T911-2004 "Frequency Response Analysis Method for Winding Deformation of Power Transformers" in △ * Power Standard

Main technical parameters of transformer winding deformation tester:

1. Scanning method:
The instrument has a dual measurement system of linear sweep frequency measurement and segmented sweep frequency measurement
(1) Linear scanning distribution
Sweep frequency measurement range: (1kHz) - (1MHz), 1000 sweep frequency points, resolution of 1kHz
(2) Segmented sweep frequency measurement distribution
Sweep frequency measurement range: (1kHz) - (100kHz), 1000 sweep frequency points; （100kHz）-（600kHz）、 Resolution of 1000Hz; (600kHz) - (1MHz), resolution of 1000Hz

2. Other technical parameters of transformer winding deformation tester:
△ Amplitude measurement range: (-100dB) - (+20dB)
△ Amplitude measurement accuracy: (-80dB) - (+20dB) ± 1dB
△ Scanning frequency accuracy: less than 0.01%
△ Signal input impedance: 1M Ω
△ Signal output impedance: 50 Ω
△ Same phase test repetition rate: 99.5%