Winding Deformation Tester Quotation
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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
Technical Indicators of Winding Deformation Tester
The instrument comes with a channel DDS signal output as the excitation signal for frequency sweep; the signal output is a sine wave, the signal output amplitude can be adjusted by software, the maximum amplitude is ±5V, and the signal output impedance is 50Ω
Two acquisition channels, one for acquiring the excitation signal and one for acquiring the response signal, used to calculate the transfer function
The excitation channel measurement has a fixed range: ±5V; the response channel has 8 ranges, and the range is automatically adjusted during the measurement process, with the maximum input signal being ±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
Acquisition channel input impedance: 1MΩ
Frequency sweep measurement range: 1K-1MHz
Sweep mode: adopts linear distribution frequency sweep measurement mode
Sweep frequency accuracy: the frequency accuracy of the sine signal output by the signal source is not greater than 0.01%
Sweep frequency measurement points: 1K-1MHz, 1000 measurement points
Adopts Vittal original chassis
Complies with national electric power industry standard: DL/T911-2004
The amplitude-frequency response characteristics of the transformer winding are obtained by frequency sweep method. By continuously changing the frequency f of the external sinusoidal excitation source VS (angular frequency ω=2πf), the ratio of the signal amplitudes of the response terminal voltage V2 and the excitation terminal voltage V1 at different frequencies is measured, and the amplitude-frequency response curve of the winding under the specified excitation terminal and response terminal conditions is obtained. L, K and C respectively represent the distributed inductance, distributed capacitance and distributed capacitance to ground per unit length of the winding, V1 and V2 are the excitation terminal voltage and response terminal voltage of the equivalent network respectively, 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 process, only the connecting busbar of the transformer needs to be removed, and all tests can be completed without lifting the cover or disassembling the transformer.
3. The instrument has dual-system measurement functions of linear frequency sweep measurement and segmented frequency sweep measurement, compatible with the measurement modes of the two current domestic technical schools. Among them, the linear frequency sweep measurement scanning frequency is up to 2MHz, providing more analysis for transformer deformation.
4. The instrument has a high degree of intelligence and is easy to use, with multiple functions such as automatic range adjustment and automatic sampling frequency adjustment.
5. The software adopts the Windows platform and is compatible with Windows 98/2000/winXP.
6. Provide historical curve comparison analysis, and can load multiple curves at the same time for comparison. (Note: The original text is incomplete, but the translation is provided based on the available content.)
