TECHNICAL MONITORING DEVICE OF DIGITAL TRANSFORMER BY PARAMETERS OF PARTIAL DISCHARGES IN INSULATION Russian patent published in 2019 - IPC G01R31/14 

FIELD: electrical engineering.

SUBSTANCE: invention relates to high-voltage engineering and can be used for diagnostics of technical state of digital transformers based on parameters of partial discharges in insulation. Device for monitoring technical state of digital transformer by parameters of partial discharges in insulation includes resistive voltage divider, which includes resistor of upper arm and resistive element of lower arm, and inductive sensor placed inside reference isolator of digital transformer, equipped with current converter, low-pass filter, high-pass filter, analogue-to-digital converter of a low-frequency signal, an analogue-to-digital converter of a high-frequency signal, a digital signal processing controller, a memory unit, a data transmission unit and an external database. Inductive sensor is connected between electrostatic screen of primary winding of electromagnetic current converter and grounded parts of transformer and is connected through high-pass filter to analogue-to-digital converter of high-frequency signal, which is connected to controller of digital signal processing. Resistive element of upper arm and resistive element of lower arm of resistive voltage divider are connected through low-pass filter to analog-digital converter of low-frequency signal, connected to digital signal processing controller, which is connected to memory unit connected via data transmission unit to external data base.

EFFECT: higher reliability of digital transformers functioning due to accuracy and timeliness of detecting development of defects inside isolation by parameters of partial discharges.

1 cl, 4 dwg