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CN-122017496-A - Transformer insulation state monitoring device and monitoring method

CN122017496ACN 122017496 ACN122017496 ACN 122017496ACN-122017496-A

Abstract

The application relates to the technical field of power transformer monitoring, in particular to a transformer insulation state monitoring device and method, comprising a circulating cylinder, wherein the lower end and the upper end of the circulating cylinder are respectively provided with a liquid inlet pipe and a liquid outlet pipe, a driving shaft is rotatably arranged in the circulating cylinder, a filtering disc connected with the driving shaft is rotatably arranged in a circulating cavity, one side of the circulating cylinder is provided with a separation monitor corresponding to the filter disc, the separation monitor comprises a dust hopper arranged in the circulating cylinder, one end of the dust hopper penetrates through the outside of the circulating cylinder to form a connector, the bottom of the connector is detachably provided with a storage tank, and the opening of the dust hopper is provided with a scraping strip contacted with the bottom of the filter disc. According to the application, the gas in the expansion chamber of the transformer oil tank is led into through the air inlet pipe to form a gas-liquid mixture with the insulating oil, the bubbles can adsorb fine impurities suspended in the oil, and the escape of the fine impurities is greatly reduced by matching with the interception function of the filter disc, so that compared with the filtration of single insulating oil, the comprehensiveness of impurity separation is improved.

Inventors

  • HAN SHENGBO
  • XIAO WENHAI
  • LI TONG
  • ZHANG MENG
  • HAN SHENGPING
  • XU FANG

Assignees

  • 山东置信智能设备有限公司

Dates

Publication Date
20260512
Application Date
20260316

Claims (10)

  1. 1. The transformer insulation state monitoring device comprises a circulating cylinder (1), wherein a liquid inlet pipe (11) and a liquid outlet pipe (12) are respectively arranged at the lower end and the upper end of the circulating cylinder (1), and the transformer insulation state monitoring device is characterized in that a driving shaft (2) is rotationally arranged in the circulating cylinder (1), a filter disc (3) connected with the driving shaft (2) is rotationally arranged in the circulating cylinder (1), and the filter disc (3) is used for intercepting impurities in insulating oil; The circulating cylinder (1) is provided with a circulating driving piece (4), and the circulating driving piece (4) is used for conveying mixed fluid of insulating oil and air of the transformer from a liquid inlet pipe (11) to a liquid outlet pipe (12); a separation monitor (5) corresponding to the filter disc (3) is arranged on one side of the circulating cylinder (1), and the separation monitor (5) is used for separating and collecting impurities on the filter disc (3) and detecting weight increment and types of the impurities; The separation monitor (5) comprises a dust hopper (6) arranged in the circulating cylinder (1) and positioned at the lower end of the filter disc (3), one end of the dust hopper (6) penetrates through the circulating cylinder (1) and is provided with a connector (8), the bottom of the connector (8) is detachably provided with a storage tank (9), and the opening of the dust hopper (6) is provided with a scraping strip (63) contacted with the bottom of the filter disc (3).
  2. 2. The transformer insulation state monitoring device according to claim 1, wherein the dust collecting hopper (6) comprises a hopper part (61) and a pipe part (62), a conveying member (7) is arranged in the pipe part (62), and the conveying member (7) is used for conveying impurities in the hopper part (61) to the storage tank (9); The conveying member (7) comprises a rotating shaft (71) which is rotationally arranged in the pipe part (62), and a spiral blade (72) is arranged on the rotating shaft (71).
  3. 3. The transformer insulation state monitoring device according to claim 2, wherein a driven gear (73) is arranged at one end of the rotating shaft (71), and a driving gear (74) meshed with the driven gear (73) is arranged on the driving shaft (2).
  4. 4. The transformer insulation state monitoring device according to claim 2, wherein the pipe portion (62) is inclined downward from the outside of the circulation tube (1).
  5. 5. The transformer insulation state monitoring device according to claim 2, wherein the connector (8) comprises a tube part (81) which is arranged outside the circulating tube (1) in a penetrating way, a plunger (82) is clamped in the tube part (81) in a rotating way, a runner (83) corresponding to the tube part (62) is arranged on the plunger (82), and the runner (83) is connected with the tube part (62) and the storage tank (9).
  6. 6. The transformer insulation state monitoring device according to claim 1, wherein the storage tank (9) comprises a tank body (91) detachably mounted at the lower end of the connector (8), a baffle plate (92) is slidably arranged at the bottom of the tank body (91), and an adjusting screw (93) is rotatably arranged at the bottom of the tank body (91) and used for driving the baffle plate (92) to slide along the bottom of the tank body (91).
  7. 7. The transformer insulation state monitoring device according to claim 1, wherein the circulating driving piece (4) comprises a partition plate (41) which is slidably arranged in the circulating cylinder (1), a unidirectional flow port (42) is arranged on the partition plate (41), the unidirectional flow port (42) only allows fluid to flow from bottom to top, and the partition plate (41) is used for realizing circulating conveying of the fluid in cooperation with the driving shaft (2).
  8. 8. The transformer insulation state monitoring device according to claim 7, wherein the partition plate (41) divides the circulating cylinder (1) into an upper circulating cavity (43) and a lower circulating cavity (44), and the upper circulating cavity (43) and the lower circulating cavity (44) are communicated through a unidirectional flow port (42); The liquid inlet pipe (11) is located at the bottom of the lower circulation cavity (44), the liquid outlet pipe (12) is arranged at the upper end of the upper circulation cavity (43), the air inlet pipe (13) is arranged at the bottom of the circulation cylinder (1), and the air inlet pipe (13) is communicated with the lower circulation cavity (44).
  9. 9. The transformer insulation state monitoring device according to claim 7, wherein the driving shaft (2) is provided with a reciprocating threaded section (45) positioned at the lower end of the filter disc (3), the partition plate (41) is in threaded fit with the reciprocating threaded section (45), the partition plate (41) is driven to slide up and down when the driving shaft (2) rotates, and the gas-liquid mixed fluid in the lower circulation cavity (44) is conveyed upwards to the filter disc (3) by being matched with the unidirectional flow port (42).
  10. 10. A method for monitoring the insulation state of a transformer, which is characterized in that the method comprises the following steps: The method comprises the steps of circularly filtering, starting a driving shaft (2), driving a reciprocating threaded section (45), a filtering disc (3) and a driving gear (74) to synchronously rotate, converting rotary motion into linear motion through threaded cooperation of the reciprocating threaded section (45) and a partition plate (41), driving the partition plate (41) to slide up and down along a circulating cylinder (1), and sucking insulating oil in a transformer through a liquid inlet pipe (11) by utilizing pressure difference formed by the up and down sliding of the partition plate (41) to directionally push the insulating oil to the filtering disc (3) through a unidirectional flow port (42); The second step is that impurities are collected, when the filter disc (3) rotates, the scraping strips (63) continuously scrape the impurities intercepted on the surface, and the impurities are sent into the storage tank (9) through the dust collecting hopper (6), the connector (8) and the runner (83) of the plunger (82) under the synergistic effect of gravity and pushing of the spiral blade (72), and the filtered insulating oil flows back to the transformer oil tank through the liquid outlet pipe (12) to complete closed circulation; detecting impurities, namely synchronously carrying out detection work by a sensor after the impurities are sent into a storage tank (9), precisely counting the weight increment of the impurities in a period, and identifying the types of the impurities through image identification and spectrum analysis; And fourthly, sampling and maintaining, namely rotating the plunger (82) and adjusting the baffle (92) to doubly plug the insulating oil, disassembling the old storage tank (9), closing the bottle cap to prevent leakage, replacing a reset part after a new tank body (91) filled with the insulating oil, and sealing and installing the sensor after overhauling and calibrating to ensure that the device is restored to normal operation.

Description

Transformer insulation state monitoring device and monitoring method Technical Field The application relates to the technical field of power transformer monitoring, in particular to a transformer insulation state monitoring device and method. Background The transformer is core equipment for realizing voltage conversion and electric energy transmission in an electric power system, and the stability of an internal insulation system directly determines the operation safety and the service life of the equipment. The oil paper insulating structure is a main flow insulating form of the transformer, and mainly comprises insulating paper, insulating oil and windings, wherein the insulating oil is used as a liquid insulating medium and has multiple functions of insulation, heat dissipation, arc extinction, partial discharge inhibition and the like. In the long-term operation process, the transformer is affected by factors such as an electric field, temperature, moisture, oxygen and the like, insulating oil can be gradually oxidized and decomposed, and solid insulating materials can be aged and cracked to generate solid impurities such as carbon powder, metal scraps, oil sludge and the like and various characteristic gases. These impurities and gases are suspended or dissolved in the insulating oil, which reduces the insulating strength of the oil, exacerbates the risks of partial discharge and overheating, eventually leading to reduced insulating properties and even to equipment failure. The prior art can continuously collect data during normal operation of the transformer through on-line monitoring, and compensates hysteresis of off-line detection, such as an oil paper insulation transformer with a monitoring function, with the application number of CN202311171990.0, wherein both sides of a transformer case are provided with a plurality of heat dissipation plates and a heat dissipation machine case, the temperature of insulating oil is automatically detected through a temperature sensor, heat dissipation of different levels is realized according to different temperatures, oil level is automatically monitored through a liquid level monitoring system and is automatically injected, insulating oil is automatically filtered through a filtering barrel, the insulation performance of the oil paper is automatically monitored through an edge monitoring system, and the temperature, the oil level and the insulation performance of the insulating oil can be transmitted to a cloud end through a wireless transmission mode. However, when monitoring the insulation state of the transformer, the sensor is extremely easily affected by external interference signals such as switch operation and electromagnetic radiation in a power system when capturing partial discharge signals, so that the misjudgment rate is high, the actual discharge signals and the interference signals are difficult to distinguish, and the reliability of the monitoring result is affected. The detection of parameters such as dielectric loss, water content, dissolved gas content and the like of the insulating oil is dependent on periodic sampling analysis or fixed-point monitoring of a sensor, so that the global real-time feedback of the oil state cannot be realized, the early trend of the deterioration of the insulating oil is not captured timely, and the optimal intervention time is easily missed. In the prior art, the data acquisition and threshold alarming are only performed, the deep coupling analysis on the intrinsic mechanisms such as the aging of the monitoring data and the insulating material, the development of partial discharge, the degradation of oil liquid and the like is lacking, the accurate prediction of the degradation trend of the insulating state is difficult to realize, the alarming can be only performed after the fault occurs, and the potential risk cannot be early warned in advance. Based on this, in the statement of the above point of view, the prior art way of monitoring the insulation state of a transformer still has room for improvement. Disclosure of Invention In order to solve the technical problems, the application provides a transformer insulation state monitoring device and a transformer insulation state monitoring method, which adopt the following technical scheme: In the first aspect, the insulating state monitoring device of the transformer comprises a circulating cylinder, wherein a liquid inlet pipe and a liquid outlet pipe are respectively arranged at the lower end and the upper end of the circulating cylinder, a driving shaft is rotationally arranged in the circulating cylinder, a filter disc connected with the driving shaft is rotationally arranged in the circulating cylinder, and the filter disc is used for intercepting impurities in insulating oil; the circulating cylinder is provided with a circulating driving piece, and the circulating driving piece is used for conveying mixed fluid of insulating oil and air of the transformer