SFRA Test Set

SFRA Test Set is an instrument for measuring the winding deformation of transformers. It mainly detects the amplitude frequency response characteristics of each winding of the transformer, and compares the detection results vertically or horizontally. Based on the degree of change in the amplitude frequency response characteristics, it determines the possible winding deformation of the transformer. The transformer winding deformation frequency response tester, based on the measurement of the characteristic parameters of the internal winding of the transformer, adopts the FRA method for internal fault frequency response analysis that is being developed and improved by developed countries in the world, which can accurately judge the internal faults of the transformer

Under the action of higher frequency voltage, each winding of the transformer can be regarded as a passive linear dual port network composed of distributed parameters such as linear resistance, inductance (mutual inductance), capacitance, etc. Its internal characteristics can be described by the transfer function H (j ω). If the winding deforms, the distributed inductance, capacitance and other parameters inside the winding will inevitably change, causing the zero and pole points of the equivalent network transfer function H (j ω) to change, resulting in a change in the frequency response characteristics of the network.

The amplitude frequency response characteristics of transformer windings are obtained by frequency scanning. Continuously change the frequency f (angular frequency ω=2 π f) of the externally applied sine wave excitation source VS, measure the ratio of the signal amplitude of the response terminal voltage V2 and the excitation terminal voltage V1 at different frequencies, and obtain the amplitude frequency response curve of the winding under the specified excitation terminal and response terminal conditions. L. K and C respectively represent the distributed inductance, distributed capacitance, and ground distributed capacitance per unit length of the winding. V1 and V2 are the excitation terminal voltage and response terminal voltage of the equivalent network, VS is the sine wave excitation signal source voltage, RS is the signal source output impedance, and R is the matching resistance.

The acquisition control adopts high-speed and highly integrated microprocessors.
USB communication interface between PC and instrument.
The hardware core adopts DDS dedicated digital high-speed scanning technology (USA), 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 16 bit A/D (on-site testing shows significant output changes by changing the tap changer).
The signal output amplitude can be adjusted by software, with a maximum peak amplitude of ± 10V.
The computer generates electronic documents (WORD) of the detection results
Finished circuit board, with special surface treatment, has resistance to water and harmful gas pollution.
Laptops and measuring instruments are powered by isolated power sources to eliminate external interference.

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