An insulating oil quality monitoring system and a monitoring method

Abstract

The present invention relates to the technical field of on-line monitoring, and particularly to an insulating oil quality monitoring system and a monitoring method. The insulating oil quality monitoring system includes: an oil pressure sensor, an ultrasonic detector, and a display terminal; the oil pressure sensor is used to detect the specific value of the oil pressure and compare the pressure value with a specified value; the ultrasonic detector is used to detect the quality of the insulating oil body passing through the oil pressure sensor system and compare the oil body quality with a preset reference value; the display terminal is used to feedback the detection result. When in use, the present invention realizes real-time monitoring of the operating state and quality of the insulating oil by detecting the quality and oil pressure of the insulating oil, timely reminds the staff to replace, reduces the work intensity of the staff, avoids the occurrence of failures of power equipment due to the aging of the insulating oil, and improves the reliability of the operation of power equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of on-line monitoring, and particularly to an insulating oil quality monitoring system and a monitoring method. Background Art

[0002] Insulating oil, also known as transformer oil, is an artificially synthesized liquid insulating material, which is a fractionation product of petroleum and is commonly used in high-voltage electrical equipment. Insulating oil has a much higher insulation strength than air. Generally, insulating materials are immersed in insulating oil, which can not only improve the insulation strength but also protect against moisture erosion. The specific heat of insulating oil is relatively large and can be used as a coolant. At the same time, the heat generated during the operation of the transformer causes the oil near the iron core and winding to expand and rise. Through the up and down convection of the insulating oil, the heat is dissipated through the radiator to ensure the normal operation of the transformer. On oil circuit breakers and on-load tap-changers of transformers, arcs are generated when the contacts are switched. Due to the good heat conduction performance of insulating oil and the ability to decompose a large amount of gas under the high temperature of the arc, generating a large pressure, the arc extinguishing performance of the medium is improved, and the arc is quickly extinguished. It is widely used in high-voltage electrical equipment such as power transformers, oil circuit breakers, oil-filled cables, and power capacitor bushings. It can impregnate and protect the solid insulation of transformers, cables, and capacitors, fill the air bubbles in the insulation, prevent the intrusion of external air and moisture, and ensure reliable insulation.

[0003] Due to the excellent performance of insulating oil, oil-immersed power equipment is increasingly applied to substations. Oil temperature and oil pressure are the key indicators indicating the health of oil-immersed power equipment. At present, most oil pressure sensors only perform periodic detection of oil pressure or oil temperature, and for the state of insulating oil, only periodic manual detection can be carried out, and it is impossible to timely detect the gradual aging of insulating oil with the increase of service time, resulting in a series of accidents. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an insulating oil quality monitoring system and a monitoring method to monitor the quality of the insulating oil of oil-immersed power equipment, upload the monitoring data, realize the on-line monitoring of the insulating oil quality of oil-immersed power equipment, record the current operating state of the on-line insulating oil in real time, master the change trend of the operating state of the insulating oil, so as to timely detect the aging of the insulating oil, replace it in advance, avoid a series of accidents caused by the aging of the insulating oil, and save a large amount of operation and maintenance costs.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] An insulating oil quality monitoring system includes: an oil pressure sensor, an ultrasonic detector, and a display terminal;

[0007] The oil pressure sensor is used to detect the specific value of the oil pressure and compare the pressure value with a specified value;

[0008] The ultrasonic detector is used to detect the quality of the insulating oil passing through the oil pressure sensor system and compare the oil quality with a preset reference value;

[0009] The display end is used to feedback the detection result.

[0010] Further, the ultrasonic detector includes: a transmitting module, a receiving control module, and a data processing module;

[0011] The transmitting module is used to transmit ultrasonic waves to the passing insulating oil;

[0012] The receiving control module captures the ultrasonic waves passing through the insulating oil and sends the ultrasonic wave data to the data processing module;

[0013] A predicted difference is preset in the data processing module, and the data measured each time is compared with the data detected for the first time.

[0014] Further, the transmitting module includes a frequency control unit, a transmitting control unit, a transmitting driving unit, and an ultrasonic converter, which are used to control the consistency of the ultrasonic waves transmitted each time.

[0015] Further, the surfaces of the modules of the ultrasonic detector are kept consistent.

[0016] Further, the surface consistency of the modules is uniformly calibrated electronically.

[0017] A monitoring method for an insulating oil quality monitoring system includes the following steps:

[0018] S1: The insulating oil passes through the oil pressure sensor;

[0019] S2: When the insulating oil passes through the oil pressure sensor, the quality of the passing insulating oil is periodically monitored;

[0020] S3: When the detected value exceeds the predetermined value, feedback warning is carried out;

[0021] S4: When the detected value meets the specified value, the oil pressure is detected;

[0022] S5: When the detected oil pressure is too high, a feedback signal is sent to step S2, and the oil quality detection is immediately carried out;

[0023] S6: If the detection is qualified, but the oil pressure is still too high, a signal is sent to the display end to turn on the yellow light, reminding the staff that the oil pressure is too high and needs to be checked. If the detection is unqualified, a signal is sent to the display end to turn on the red light, reminding the staff that the insulating oil is aging;

[0024] S7: When the oil pressure sensed by the oil pressure sensor meets the specified value, a fixed pressure is introduced into the oil pressure sensor. The oil pressure sensor tests the fixed pressure and reads the data.

[0025] S8: Compare the data read in step S7 with the fixed pressure value. When the difference exceeds the predetermined range, a feedback signal is sent to remind the staff of the oil pressure detector failure. When the difference is within the predetermined range, the work proceeds normally.

[0026] Further, step S2 is specifically as follows:

[0027] S2.1: The ultrasonic detector detects the passing oil.

[0028] S2.2: Take the data of the oil quality detection read for the first time as the reference value.

[0029] S2.3: Compare the value detected each time thereafter with the reference value.

[0030] S2.4: When the detected value has a large gap from the reference value, a feedback signal is sent to the staff to check the oil quality.

[0031] Further, step S2.1 is specifically as follows:

[0032] S2.1.1: When the oil body passes through the ultrasonic detector, the transmitting module emits ultrasonic waves to the oil body.

[0033] S2.1.2: After the ultrasonic waves pass through the oil body, they are finally captured by the receiving and control module, and the captured ultrasonic wave data is sent to the data processing module.

[0034] S2.1.3: Set a predicted difference in the data processing module.

[0035] S2.1.4: The data processing module records the data measured each time and compares the data with the data of the first monitoring.

[0036] S2.1.5: When the data difference exceeds the predicted difference, a feedback warning is given to remind the staff to check and replace the insulating oil.

[0037] The beneficial effects of the present invention are as follows: By monitoring the quality of insulating oil, the present invention realizes the discovery of the operating state and quality of insulating oil during use, timely reminds the staff to replace it, reduces the work intensity of the staff, avoids the occurrence of failures in power equipment due to the aging of insulating oil, improves the reliability of the operation of power equipment, and thus improves the functionality and practicality of the oil pressure sensor; Through the ultrasonic detector, the on-line monitoring of insulating oil is realized, and at the same time, the quality data of insulating oil is digitalized, so that the staff can more intuitively see the state of insulating oil and know the quality of insulating oil at all times, further improving the convenience of the oil pressure sensor and also improving the intelligence of the device; In addition, the ultrasonic detector uses a frequency control unit to emit appropriate ultrasonic waves, so that the receiving control module is easier to capture, realizes the filtering of interference signals, and improves the accuracy of data; Through the cooperation of a fixed pressure, the self-test of the oil pressure sensor is realized, which is easy to ensure its accuracy, improve its reliability, and reduce the damage of power equipment caused by the failure of the oil pressure sensor and other phenomena. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0039] Figure 1 It is a flow chart of the insulating oil quality monitoring system in the present invention;

[0040] Figure 2 It is a flow chart of the ultrasonic detection in the present invention;

[0041] Figure 3 It is a flow chart of the ultrasonic emission in the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs. The terms used in the description of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term “and / or” used herein includes any and all combinations of one or more of the related listed items.

[0044] An insulating oil quality monitoring system, comprising: an oil pressure sensor, an ultrasonic detector and a display terminal; the oil pressure sensor is used to detect the specific value of the oil pressure and compare the pressure value with a specified value; the ultrasonic detector is used to detect the quality of the insulating oil body passing through the oil pressure sensor system and compare the oil body quality with a preset reference value; the display terminal is used to feedback the detection result.

[0045] In the specific implementation process, when the oil-immersed transformer starts to work, the micro-power wireless oil pressure sensor starts to work with its own grounding. At this time, the insulating oil passes through the oil pressure sensor, and the ultrasonic detector detects the quality of the insulating oil and judges the quality of the insulating oil. If it does not meet the standard, it will feedback a signal to the display terminal to turn on a red light and issue a warning to the outside world. If it meets the standard, the next oil pressure detection will be carried out. The oil body passes through the oil pressure sensor to measure the oil pressure and compare it with the specified pressure value to judge whether the oil pressure meets the standard. If the standard is met, the oil pressure detection ends. If the standard is not met, it will return for secondary quality detection and give feedback according to the result.

[0046] In the actual detection process, the monitoring of insulating oil is periodic and can be monitored once a week. Therefore, when the insulating oil is not in the detection period, the insulating oil directly undergoes oil pressure detection. When the value of the oil pressure exceeds the specified value, the system determines it as abnormal. At this time, it is necessary to conduct a quality inspection of the insulating oil to eliminate the influence of oil quality problems, and transmit the feedback signal to the insulating oil quality monitoring department, so that it immediately conducts a quality inspection of the insulating oil. If the data of the oil quality after detection is not within the predetermined range, a signal will be directly feedback to the display terminal to turn on a red light to remind the staff that there is a problem with the insulating oil, so as to replace it; if the data of the oil quality after detection is within the predetermined range, a signal will be feedback to the display terminal to turn on a yellow light to remind the staff that the oil pressure is abnormal and needs to be checked.

[0047] As an optimization of the above embodiment, the ultrasonic detector includes a transmitting module, a receiving control module and a data processing module; the transmitting module is used to transmit ultrasonic waves to the passing insulating oil body; the receiving control module captures the ultrasonic waves passing through the insulating oil body and sends the ultrasonic wave data to the data processing module; a predicted difference is preset in the data processing module, and the data measured each time is compared with the data detected for the first time; the ultrasonic detector is used to detect the quality of the insulating oil body passing through the oil pressure sensor system and compare the oil body quality with a preset reference value; the display terminal is used to feedback the detection result. Through the ultrasonic monitoring device, the quality data of the insulating oil is digitized, enabling the staff to more intuitively see the state of the insulating oil and further improving the convenience of the oil pressure sensor.

[0048] In order to further improve the accuracy of the quality monitoring data of insulating oil, the transmitting module includes a frequency control unit, a transmitting control unit, a transmitting drive unit and an ultrasonic converter, which are used to control the consistency of the ultrasonic waves emitted each time, so that the ultrasonic waves are more easily captured, realizing the filtering of interference signals and improving the accuracy of the data.

[0049] Preferably, in the above embodiments, the surface of the ultrasonic detector module is kept consistent, and the consistency is uniformly calibrated electronically.

[0050] This embodiment provides a monitoring method for a micro-power wireless oil pressure sensor, as Figure 1 shown, including the following steps:

[0051] S1: Insulating oil passes through the oil pressure sensor;

[0052] S2: When the insulating oil passes through the oil pressure sensor, the quality of the passing insulating oil is periodically monitored;

[0053] S3: When the detected value exceeds a predetermined value, feedback warning is performed;

[0054] S4: When the detected value meets the specified value, the oil pressure is detected;

[0055] S5: When the detected oil pressure is too high, a feedback signal is sent to step S2, and the oil quality detection is immediately performed;

[0056] S6: If the detection is qualified, but the oil pressure is still too high, a signal is sent to the display end to turn on the yellow light, reminding the staff that the oil pressure is too high and needs to be checked. If the detection is unqualified, a signal is sent to the display end to turn on the red light, reminding the staff that the insulating oil is aging;

[0057] S7: When the oil pressure sensed by the oil pressure sensor meets the specified value, a fixed pressure is introduced into the oil pressure sensor, and the oil pressure sensor tests the fixed pressure and reads the data;

[0058] S8: Compare the data read in step S7 with the fixed pressure value. When the difference exceeds a predetermined range, a feedback signal is given to remind the staff that the oil pressure detector is faulty. When the difference is within the predetermined range, work is carried out normally.

[0059] In order to eliminate the influence of oil pressure sensor equipment problems on the detection results and to repair the sensor in time, when the oil pressure detection is abnormal, a fixed pressure is introduced into the oil pressure sensor, and the oil pressure sensor measures and reads the data. After reading, the data is compared with the fixed pressure value. If the difference is not within the predetermined range, a feedback signal is sent to the display end to inform the staff that the oil pressure sensor is abnormal and needs to be repaired or replaced. If the difference is within the predetermined range, the current oil pressure detection is normal.

[0060] Among them, step S2 is specifically:

[0061] S2.1: The ultrasonic detector detects the passing oil;

[0062] S2.2; Use the data of the first oil quality detection as the reference value;

[0063] S2.3: Compare the value detected each time subsequently with the reference value;

[0064] S2.4: When the detected value has a large difference from the reference value, send a feedback signal to the staff to check the oil quality.

[0065] Among them, as Figure 2 shown, step S2.1 is specifically:

[0066] S2.1.1: When the oil body passes through the ultrasonic detector, the transmitting module emits ultrasonic waves to the oil body;

[0067] S2.1.2: After the ultrasonic waves pass through the oil body, they are finally captured by the receiving and control module, and the captured ultrasonic wave data is sent to the data processing module;

[0068] S2.1.3: Set a predicted difference in the data processing module;

[0069] S2.1.4: The data processing module records the data measured each time and compares the data with the data of the first monitoring;

[0070] S2.1.5: When the data difference exceeds the predicted difference, give a feedback warning to remind the staff to check and replace the insulating oil.

[0071] After the ultrasonic waves output by the transmitting control module in the ultrasonic detection device are transmitted through the insulating oil, they are received by the receiving and control module and the ultrasonic signals are converted into digital signals through the signal processing circuit. Subsequently, these digital signals are transmitted through the port for data processing. As Figure 3 shown, the output signal is controlled through the frequency control unit. The frequency control unit determines the carrier frequency, thereby ensuring that appropriate ultrasonic signals are emitted, enabling the receiving and control module to better capture the ultrasonic signals, realizing the filtering of interference signals, and thus obtaining an accurate analog quantity of the ultrasonic signal.

[0072] Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A monitoring method for an insulating oil quality monitoring system It includes the following steps: S1: Insulating oil passes through an oil pressure sensor; S2: When the insulating oil passes through an ultrasonic detector, the quality of the passing insulating oil is monitored periodically; S3: When the detected value exceeds a predetermined value, a feedback warning is given; S4: When the detected value meets the predetermined value, the oil pressure is detected; S5: When the detected oil pressure is too high, a signal is fed back to step S2, and oil quality detection is immediately carried out; S6: If the detection is qualified, but the oil pressure is still too high, a signal is transmitted to the display end to turn on a yellow light to remind the staff that the oil pressure is too high and needs to be checked. If the detection is unqualified, a signal is transmitted to the display end to turn on a red light to remind the staff that the insulating oil is aging; S7: When the oil pressure sensed by the oil pressure sensor meets the specified value, a fixed pressure is introduced into the oil pressure sensor, and the oil pressure sensor tests the fixed pressure and reads the data; S8: Compare the data read in step S7 with the fixed pressure value. When the difference exceeds the predetermined range, a feedback signal is given to remind the staff that the oil pressure sensor is faulty. When the difference is within the predetermined range, the work is carried out normally; realizing the on-line monitoring of insulating oil and the self-test of the oil pressure sensor.

2. The monitoring method of an insulating oil quality monitoring system according to claim 1, characterized in that, Step S2 is specifically as follows: The ultrasonic detector detects the passing oil; Take the data of the first oil quality detection as the reference value; Compare the value detected each time hereafter with the reference value; When the detected value has a large gap from the reference value, a signal is fed back to the staff to check the oil quality.

3. The monitoring method of an insulating oil quality monitoring system according to claim 2, characterized in that, Step S2 is further specifically as follows: When the oil body passes through the ultrasonic detector for detection, the transmitting module emits ultrasonic waves to the oil body; After the ultrasonic waves pass through the oil body, they are finally captured by the receiving control module, and the captured ultrasonic wave data is sent to the data processing module; Set a predicted difference in the data processing module; The data processing module records the data measured each time and compares the data with the first monitoring data; When the data difference exceeds the predicted difference, a feedback warning is given to remind the staff to check and replace the insulating oil.

4. An insulating oil quality monitoring system using the monitoring method of an insulating oil quality monitoring system according to any one of claims 1 to 3, characterized in that, It includes: An oil pressure sensor, an ultrasonic detector and a display end; The oil pressure sensor is used to detect the specific value of the oil pressure and compare the pressure value with the specified value; The ultrasonic detector is used to detect the quality of the insulating oil body and compare the quality of the oil body with the reference value; The display end is used to feedback the detection result.

5. The insulating oil quality monitoring system according to claim 4, characterized in that The ultrasonic detector includes: a transmitting module, a receiving control module and a data processing module; The transmitting module is used to emit ultrasonic waves to the passing insulating oil body; The receiving control module captures the ultrasonic waves passing through the insulating oil body and sends the ultrasonic wave data to the data processing module; A predicted difference is preset in the data processing module, and the data measured each time is compared with the first detection data.

6. The insulating oil quality monitoring system according to claim 5, characterized in that, The transmitting module includes a frequency control unit, a transmitting control unit, a transmitting driving unit and an ultrasonic converter, which are used to control the ultrasonic waves emitted each time to be consistent.

7. The insulation oil quality monitoring system according to claim 5, characterized in that, The surfaces of the modules of the ultrasonic detector are kept consistent.

8. An insulating oil quality monitoring system according to claim 7, characterized in that, The surface consistency of the modules is uniformly calibrated electronically.

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