RU-2861591-C1 - DEVICE FOR ACOUSTIC MONITORING OF PARTIAL DISCHARGES FOR POWER TRANSFORMER TAKING INTO ACCOUNT ACTUAL OPERATING MODE OF TRANSFORMER

Abstract

FIELD: electric power industry. SUBSTANCE: invention relates to diagnostic systems for power transformers under load. The device for acoustic monitoring of partial discharges for power transformers, taking into account the actual operating mode of the transformer, is additionally equipped with a power supply unit, a human-machine interface unit, and a communication unit, as a result of which increased reliability of operation of power transformers and autotransformers is ensured. EFFECT: increasing the reliability of operation of power transformers and autotransformers by ensuring the possibility of accurate and early detection of developing insulation defects in real operating conditions under load, regardless of seasonal and daily temperature fluctuations and changes in equipment operating modes. 1 cl, 1 dwg

Inventors

• KOSORLUKOV IGOR ANDREEVICH
• TIMCHENKO MAKSIM SERGEEVICH
• SOLOVEV ALEKSANDR VLADIMIROVICH
• Avdonkin Sergej Aleksandrovich
• Strochkov Aleksej Vladimirovich

Dates

Publication Date

20260506

Application Date

20251105

Claims (1)

1. A device for monitoring a power transformer, including acoustic sensors and temperature sensors installed on the body of the oil-filled tank of the transformer, a power supply unit and a unit for visualizing the parameters being monitored, characterized in that it is additionally provided with load current sensors installed on the terminals of the transformer, and is equipped with an input signal processing unit implemented in the central processor module, which forms a complex signal from all measurements received from the sensors, an analytical unit and a non-volatile memory unit, as well as a human-machine interface unit interconnected with the central processor module, used for visualizing the parameters being monitored, and a communication unit, with an Ethernet port built into it for communicating with higher-level systems via industrial protocols, wherein the outputs of all sensors are connected to the corresponding inputs of the central processor module for transmitting signals to the input signal processing unit, which transmits the signals processed in it to the analytical unit and the non-volatile memory unit interconnected with each other.

Description

Field of technology to which the invention relates The invention pertains to the field of electric power and electrical engineering, specifically to continuous diagnostic monitoring systems for the technical condition of high-voltage oil-filled equipment, such as power transformers and autotransformers. It is intended for use at power plants, substations, and industrial facilities for the early detection of developing insulation defects in continuous mode, thereby increasing reliability and preventing emergency failures. State of the art It is known that the technical condition of power transformers is determined by a set of parameters, changes in which indicate the development of defects. One of the most informative parameters characterizing the condition of the insulation is the intensity of partial discharges (PD). Acoustic PD monitoring allows for diagnostics without taking the equipment out of service. However, the reliability of acoustic measurements is significantly affected by operating conditions, particularly oil temperature and load current, complicating the interpretation of the results. A technical solution is known (Patent of the Russian Federation for Utility Model No. 108855 U1, G01R 31/12, H01F 27/00, application No. 2011108791/28 dated 03/09/2011, published on 09/27/2011), which is a device for monitoring, diagnostics and protection of transformers, in which sensors in the form of electrodes made of conductive foil, located between the layers of insulation of the windings during the manufacture of the transformer, are used to control the state of insulation. The disadvantages of this technical solution include the need to modify the existing transformer designs in order to implement the sensors used in this technical solution, the practical impossibility of using this solution on existing transformers, since it requires intervention inside the transformer tank and can lead to additional damage due to the presence of a foreign object in the transformer tank (sensors in the form of electrodes made of conductive foil). A technical solution is known (RU Patent No. 2638129 C2, G01R 31/00, published on 11.12.2017) which is a device for diagnosing power transformers. The device includes an oil sample preparation unit, a chromatographic analysis module, a chromatograph, a chromatography data transmission unit, a digital data processing unit, a common bus, a data input unit, a memory unit, and a diagnostic results unit. It also contains a transformer, a partial discharge module, a data collection unit, a partial discharge calibration unit, a partial discharge filtration unit, a partial discharge method data transmission unit, a chemical-physical analysis module, an oil sample preparation unit, an oil dielectric strength determination unit, an oil purity determination unit, an oil flash point measurement unit, an analytical unit, and a database of regulatory and reference information. The oil sample preparation unit, chromatograph, and chromatography data transmission unit are combined into a chromatography analysis module, while the partial discharge diagnostics module consists of a data collection unit, a partial discharge calibration unit, a partial discharge filtration unit, and a partial discharge data transmission unit. The chemical-physical analysis module consists of an oil sample preparation unit, an oil dielectric strength determination unit, an oil cleanliness determination unit, and an oil flash point measurement unit. A disadvantage of this technical solution is the need for manual data entry from the chemical-physical analysis module using the data entry unit, which prevents continuous diagnostics. A technical solution (RU Patent No. 2019850, G01R 31/12, published September 27, 1994) is known, which is a method for monitoring partial discharge characteristics and a device for implementing it. The method involves exposing the test object to an industrial-frequency test voltage and recording the amplitude spectra of partial discharge pulses. Differentiation of the partial discharge pulses is followed by high-frequency filtering. The resulting signal is amplified and integrated, and the amplitude spectra of the partial discharge pulses are determined from the integral distribution of the pulse amplitudes obtained as a result of integration. This method is implemented in a device for monitoring partial discharge characteristics, comprising a test transformer, a high-voltage capacitor, a high-pass filter, a measuring cable, and a recording instrument connected in series. One of the capacitor plates is the current-carrying core of the test object. A conductive plate, which serves as the second plate of the capacitor and is connected to the input of the high-pass filter, is located parallel to this plate. The second plate is realized as a section of a two-wire line with distributed parameters. The recording instrument includes a series-connected broadband integrating amplifier, a comparator,