A Transformer Insulation Diagnosis Method Considering Different Wiring Modes
A technology of wiring mode and diagnosis method, which is applied in the direction of instruments, measuring electrical variables, complex mathematical operations, etc., can solve the problems of difficult implementation of transformer internal fault diagnosis test and complex structure, etc.
Active Publication Date: 2022-01-04
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology
With the increasing capacity of power transformers, the structure is becoming more and more complex, and it is becoming more and more difficult to implement the internal fault diagnosis test of the transformer.
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[0062] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:
[0063] Such as figure 1 As shown, the transformer high-frequency oscillation test platform mainly includes: box 1, iron core 2, low-voltage winding 3, high-voltage winding 4, high-frequency high-voltage DC power supply 17, signal acquisition system 15, connection mode console 16, low-voltage input bushing 5. Low-voltage output bushing 6, high-voltage input bushing 7, high-voltage output bushing 8, high-voltage winding power supply connection switch 9, high-voltage signal acquisition connection switch 10, high-voltage wiring mode control connection switch 11, low-voltage winding power supply connection switch 12, low-voltage Signal acquisition connection switch 13, low-voltage wiring mode control connection switch 14; the head end of the high-voltage winding leads out of the box body 1 through the high-voltage input bushing 7, and is connected wi...
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The invention discloses a transformer insulation diagnosis method considering differential wiring modes. Firstly, the test transformer winding is tested to obtain high-frequency oscillation signals of differential wiring modes; and the instantaneous amplitude of the test data is calculated through Hilbert transformation. signal and instantaneous phase signal; construct matrices P and Q, and perform n-level decomposition on the instantaneous amplitude signal and instantaneous phase signal through the unit eigenvector matrix corresponding to its eigenvalue; construct the matrix according to the decomposition signal of the instantaneous amplitude signal and instantaneous phase signal Calculate the characteristic parameters and characteristic correlation degree; calculate the insulation state judgment coefficient Q to judge the insulation state of the transformer. The method of the invention enriches the characteristics of the high-frequency oscillation signal by performing a high-voltage test on the transformer to test the high-frequency oscillation signal of different wiring modes, and extracts the characteristic by combining the amplitude information and the phase information to identify the insulation state of the transformer.
Description
technical field [0001] The invention relates to the field of insulation state detection of electric equipment, in particular to a transformer insulation diagnosis method considering differential connection modes. Background technique [0002] The power transformer is one of the core equipment of the power system, and its stable operation is closely related to the reliability of the power system. As the capacity of power transformers increases day by day, the structure becomes more and more complex, and it becomes more and more difficult to realize the internal fault diagnosis test of the transformer. According to relevant data statistics, most of the faults of transformers are caused by the damage of the insulation system, and the winding faults account for a considerable proportion of the total insulation faults. Therefore, it is an urgent technical problem to detect the insulation state of transformer windings accurately and effectively. [0003] The high-frequency oscil...
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IPC IPC(8): G01R31/12G01R23/16G06F17/14G06F17/16
CPCG01R31/1227G01R23/16G06F17/14G06F17/16
Inventor 周利军周猛陈田东李沃阳
Owner SOUTHWEST JIAOTONG UNIV