Winding Deformation Tester
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The Winding Deformation Tester is an instrument used to measure transformer winding deformation according to the national electric power industry standard DL/T911-2004，It mainly detects the amplitude-frequency response characteristics of each transformer windingand compares the test results longitudinally or horizontally. Based on the degree of change in the amplitude-frequency response characteristics, it determines possible windingdeformation
Technical Indicators of Winding Deformation Tester
The instrument comes with a channel DDS signal output as the excitation signal for frequency sweeping; the signal output is a sine wave, and the output amplitude can be adjusted by software, with a maximum amplitude of ±5V and an output impedance of 50Ω
Two acquisition channels, one for acquiring the excitation signal and one for the response signal, used to calculate the transfer function
The excitation channel measurement has a fixed range: ±5V; the response channel has 8 ranges, which are automatically adjusted during measurement, with a maximum input signal of ±25V
Acquisition channel quantization accuracy: 12 bits
Maximum static error of acquisition channel: 0.5%
Maximum storage capacity per channel: 64K sample points
Maximum sampling rate per channel: 20Msps
Input impedance of acquisition channel: 1MΩ
Frequency sweep measurement range: 1K－1MHz
Sweep mode: linear distribution frequency sweep measurement
Sweep frequency accuracy: the frequency accuracy of the sine signal output by the signal source is not greater than 0.01%
Frequency sweep measurement points: 1K－1MHz, 1000 measurement points
Uses Vittal original chassis
Complies with national electric power industry standard: DL/T911-2004
The amplitude-frequency response characteristics of transformer windings are obtained by frequency sweep. By continuously changing the frequency f of the external sinusoidal excitation source VS (angular frequency ω=2πf), the ratio of the response terminal voltage V2 to the excitation terminal voltage V1 at different frequencies is measured to obtain the amplitude-frequency response curve of the winding under specified excitation and response terminals. L, K, and C represent the distributed inductance, distributed capacitance, and capacitance to ground per unit length of the winding, respectively. V1 and V2 are the excitation terminal voltage and response terminal voltage of the equivalent network, VS is the sinusoidal excitation signal source voltage, RS is the output impedance of the signal source, and R is the matching resistor.
2. During the test, only the connecting busbars of the transformer need to be removed, and all tests can be completed without lifting the transformer cover or disassembling it.
3. The instrument has dual-system measurement functions of linear frequency sweep and segmented frequency sweep, compatible with the current two technical schools of measurement modes in China. The linear frequency sweep has a scanning frequency of up to 2MHz, providing more analysis for transformer deformation.
4. The instrument is highly intelligent and easy to use, with functions such as automatic range adjustment and automatic sampling frequency adjustment.
