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Transformer deformation winding tester built-in structure and detection principle
Transformer deformation winding tester built-in structure:
The transformer deformation winding tester independently developed by Shanghai Baixie Electric Technology Co., Ltd. is composed of a measuring part and an analysis software part. The measurement part is a black box consisting of signal generation and signal measurement. The analysis part is completed by a laptop computer and the measurement part is connected to a notebook computer. Through a wired or wireless Ethernet connection, it can also be connected via USB.
Transformer deformation winding tester detection principle:
Under the action of higher frequency voltage, each winding of the transformer can be regarded as a passive linear two-port network composed of linear resistance, inductance (mutual inductance), capacitance, and other distribution parameters, and its internal characteristics can be transmitted through the transfer function H ( Jω) Description. If the winding is deformed, the parameters such as distributed inductance and capacitance inside the winding will inevitably change, which will cause the zero point and pole of its equivalent network transfer function H(jω) to change, which will change the frequency response characteristics of the network.
The amplitude-frequency response characteristics of the transformer deformation winding tester are obtained by means of frequency sweep. Continuously change the frequency f of the externally applied sine wave excitation source VS (angular frequency ω=2πf), measure the ratio of the amplitudes of the response terminal voltage V2 and the excitation terminal voltage V1 at different frequencies, and obtain the designated excitation end and response end The frequency response curve of the lower winding. L, K, and C represent the distributed inductance, distributed capacitance, and distributed capacitance of the winding per unit length. V1, V2 are the excitation terminal voltage and response terminal voltage of the equivalent network, VS is the sine wave excitation signal source voltage, and RS is Signal source output impedance, R is the matching resistor.