CN118010127B - Live-line testing method for actual oil level of transformer oil storage cabinet - Google Patents
Live-line testing method for actual oil level of transformer oil storage cabinet Download PDFInfo
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- CN118010127B CN118010127B CN202410194216.XA CN202410194216A CN118010127B CN 118010127 B CN118010127 B CN 118010127B CN 202410194216 A CN202410194216 A CN 202410194216A CN 118010127 B CN118010127 B CN 118010127B
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- 238000012360 testing method Methods 0.000 title claims abstract description 100
- 238000003860 storage Methods 0.000 title claims abstract description 75
- 238000000034 method Methods 0.000 claims abstract description 13
- 239000007788 liquid Substances 0.000 claims abstract description 12
- 238000000605 extraction Methods 0.000 claims description 28
- 238000004364 calculation method Methods 0.000 claims description 12
- 230000001133 acceleration Effects 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 11
- 230000008569 process Effects 0.000 abstract description 3
- 238000010998 test method Methods 0.000 abstract description 3
- 238000003331 infrared imaging Methods 0.000 description 2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C1/00—Measuring angles
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/14—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measurement of pressure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
- G01S17/06—Systems determining position data of a target
- G01S17/08—Systems determining position data of a target for measuring distance only
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Abstract
The invention relates to the technical field of oil level measurement, in particular to a live-line test method for the actual oil level of a transformer oil storage cabinet, wherein a liquid pressure sensor is arranged at an oil taking port of a transformer oil tank to obtain the transformer oil pressure at the oil taking port of the transformer oil tank; calculating the vertical height of the actual oil level in the transformer oil storage cabinet from the oil taking port of the transformer oil tank; selecting test points and installing a testing device host; calculating the vertical height between the test point and the oil surface at the oil taking port; measuring the distance and the angle between the test point and a certain point on the surface of the oil storage cabinet; calculating the vertical height between the test point and the laser irradiation point on the surface of the oil storage cabinet; the oil level is indicated on the outer surface of the oil storage cabinet. The invention has the advantages of convenient operation, reduced equipment power failure times and power failure time, shortened test time, reduced test workload and obviously improved safety in the test process.
Description
Technical Field
The invention relates to the technical field of oil level measurement, in particular to an electrified testing method for the actual oil level of a transformer oil storage cabinet.
Background
The oil level of the transformer generally refers to the oil level of an oil storage tank of the transformer, and is an important non-electric parameter for the operation of the oil immersed transformer. The transformer oil storage cabinet is a container which is communicated with the oil tank and is arranged for adapting to the volume change of the oil in the transformer oil tank. The oil level of the oil storage cabinet of the transformer is not lower than the lowest oil level so as to ensure that the internal components of the transformer are sufficiently cooled and insulated; the oil level of the oil storage cabinet is not higher than the highest oil level, so that the transformer oil overflow is avoided when the transformer operates at a high temperature or in a full load state, and the oil level of the oil storage cabinet is indicated by the oil level indicator.
The transformer oil storage cabinet is divided into an open type and a sealed type, wherein the large-sized oil immersed transformer adopts the sealed type oil storage cabinet, the oil level gauge of the sealed type oil storage cabinet adopts a mechanical pull rod type structure or a floating ball type structure, and due to the reasons of damage, jam, floating ball damage, loose and the like of a transmission element, the oil level gauge is damaged, the oil level is possibly generated, and the like, part of the transformer is provided with an oil level on-line monitoring system based on the principles of a pressure sensor and the like, so that the oil level in the transformer oil storage cabinet can be measured in real time and remotely, but the defects of complex structure, high manufacturing cost, inconvenient installation and calibration of the transformer are overcome, and the problems of false alarm, data interruption and the like possibly occur when the transformer is required to be tested in long-term operation stability and reliability. It is therefore necessary to verify the tank level periodically, common methods being checking the oil temperature-level curve, measuring the level by means of a communicating vessel, and measuring the level by means of infrared thermometry.
The method is most convenient to check the oil temperature-oil level curve, but if oil is not injected according to the specified oil quantity in the installation process of the transformer or oil is supplemented or discharged in the operation process of the transformer, deviation exists between the actual oil temperature-oil level curve and the standard oil temperature-oil level curve, so that the checking result is influenced. The oil level corresponding position of the oil conservator can be visually indicated by measuring the oil level by the communicating vessel method, but long communicating pipes, insulating rods and other tools need to be prepared for on-site test, at least two persons are needed to cooperate, and for a large transformer, the oil conservator is higher from the ground, and certain safety risks exist due to the fact that the oil conservator is higher in distance from the ground. In addition, a part of transformer oil storage cabinet is located right above the oil tank, and the distance between the oil storage cabinet and the electrified sleeve pipe and the lead wire is relatively short, so that the oil level measurement is carried out in an electrified mode without enough safety distance, and therefore, the transformer is required to be tested in a power failure mode. Therefore, the oil level is measured by adopting the communicating vessel method, the time and the labor are wasted, the efficiency is low, and the transformer power failure matching test is possibly needed. The principle of detecting the oil level of the transformer through infrared imaging is that the temperature of the oil tank surface contacting oil is different from the temperature of the oil tank contacting the position of the capsule, the temperature of the oil tank surface is measured by using the temperature sensing effect of infrared rays, and the actual oil level of the transformer is determined through color analysis by using an image shot by an infrared imaging instrument. Because the transformer oil in the conservator does not basically participate in the heat exchange in the transformer oil tank, the temperature difference between the oil temperature and the ambient temperature is small, and particularly when the load of the transformer is low, the position of an oil level line of the oil storage tank shot by the infrared imager is fuzzy and is difficult to identify.
In view of the above, a quick and accurate on-site testing method for the oil level of the oil storage cabinet of the transformer is urgently needed at present.
Disclosure of Invention
Based on the above purpose, the invention provides a live test method for the actual oil level of the transformer oil storage cabinet.
An electrified testing method for actual oil level of a transformer oil storage cabinet comprises the following steps:
S1: a liquid pressure sensor is arranged at an oil taking port of a transformer oil tank to obtain transformer oil pressure p at the oil taking port of the transformer oil tank;
s2: calculating the vertical height h of the actual oil surface in the transformer oil storage tank from the oil taking port of the transformer oil tank according to a liquid pressure formula by using the measured oil pressure p, the measured oil density and the measured temperature of the oil taking port of the transformer oil tank;
S3: selecting a test point, installing a testing device host, measuring the distance and angle between the test point and an oil taking port, emitting first laser from the testing device host to the oil taking port, acquiring the connecting line distance d 1 between the test point and the oil taking port of a transformer oil tank based on a phase ranging principle, and measuring the connecting line between the two points and the pitch angle theta 1 of a horizontal plane by using an attitude measuring sensor;
S4: calculating the vertical height between the test point and the oil surface at the oil extraction port: calculating the vertical height h 1 of the oil level at the position of the oil taking port and the test point according to d 1、θ1;
s5: measuring the distance and angle between the test point and a certain point on the surface of the oil storage cabinet: the second laser is shot from the test point to any point on the surface of the oil storage cabinet, the connecting line distance d 2 between the test point and the point irradiated by the laser on the surface of the oil storage cabinet is obtained based on the phase ranging principle, and the connecting line between the two points and the pitch angle theta 2 of the horizontal plane are measured by using the attitude measuring sensor;
S6: calculating the vertical height between the test point and the laser irradiation point on the surface of the oil storage cabinet: calculating the vertical height h 2 between the test point and the laser irradiation point on the surface of the oil storage cabinet according to d 2、θ2;
S7: indicating the oil level on the outer surface of the oil storage cabinet: and adjusting the angle theta 2 to enable the angle h 2＝h-h1, and then obtaining the actual oil level in the oil storage cabinet at the position of the point irradiated by the laser on the surface of the oil storage cabinet.
Further, h 1 in S4 is calculated as: h 1＝d1×sinθ1.
Further, h 2 in S6 is calculated as: h 2＝d2×sinθ2.
Further, h in S2 is calculated as: wherein p is the transformer oil pressure, ρ is the density of the transformer oil, and g is the gravitational acceleration.
Further, the phase ranging principle calculation d 1 includes:
transmitting first laser from a test point to the surface of the oil storage cabinet and receiving the first laser reflected from the surface of the oil storage cabinet;
measuring the phase difference between the emitted first laser and the received first laser, wherein the phase difference is caused by the propagation distance of laser waves, and the distance is twice the round trip distance, namely the distance from the test point to the oil extraction port;
The actual length of the laser round-trip path is calculated by using the phase difference and combining the wavelength of the laser, and the formula is as follows: Wherein d 1 is the single pass line distance from the test point to the oil extraction port, Is the phase difference and λ is the wavelength of the laser light.
Further, the phase ranging principle calculation d 2 includes:
transmitting second laser from the test point to the oil extraction port, and receiving the second laser reflected from the oil extraction port;
Measuring a phase difference between the transmitted second laser and the received second laser, wherein the phase difference is caused by the propagation distance of the laser wave, and the distance is twice the round trip distance, namely the distance from the test point to the oil extraction port;
The actual length of the laser round-trip path is calculated by using the phase difference and combining the wavelength of the laser, and the formula is as follows: Wherein d 2 is the single pass link distance between the test point and the laser irradiation point on the surface of the oil storage cabinet, Is the phase difference and λ is the wavelength of the laser light.
Further, the test points are selected as follows: and a place without shielding objects is arranged between the test point and the oil taking port of the transformer and between the test point and the oil storage cabinet of the transformer.
Further, the testing device host comprises a laser ranging module and a gesture measuring sensor, wherein the laser ranging module is used for emitting first laser and second laser, and the gesture measuring sensor is used for measuring an included angle between a connecting line of two points and a horizontal plane.
The invention has the beneficial effects that:
According to the live-line testing method for the actual oil level of the transformer oil storage cabinet, the transformer oil pillow can be quickly and accurately obtained under the condition that the transformer is not powered off, the operation is convenient, the power failure times and the power failure time of equipment are reduced, the testing time is shortened, the testing workload is lightened, and the safety of the testing process is remarkably improved.
According to the invention, by combining the liquid pressure sensor, the laser ranging technology and the attitude measuring sensor, the actual oil level in the transformer oil storage cabinet can be rapidly and accurately measured under the running state of the transformer, namely under the electrified condition, the interruption of the transformer service caused by power failure is avoided, and the efficiency and the safety of maintenance work are greatly improved.
According to the invention, through accurate calculation and measurement, errors and safety risks caused by the traditional method are reduced, and the reliability and accuracy of the test are improved. The application of the testing method has important significance for ensuring the normal operation of the oil immersed transformer and prolonging the service life of the oil immersed transformer, and simultaneously provides a more efficient and safer technical means for transformer maintenance.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only of the invention and that other drawings can be obtained from them without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of measurement principle assistance in an embodiment of the present invention;
Fig. 2 is a flow chart of a measurement method according to an embodiment of the invention.
Detailed Description
The present invention will be further described in detail with reference to specific embodiments in order to make the objects, technical solutions and advantages of the present invention more apparent.
It is to be noted that unless otherwise defined, technical or scientific terms used herein should be taken in a general sense as understood by one of ordinary skill in the art to which the present invention belongs. The terms "first," "second," and the like, as used herein, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.
As shown in fig. 1-2, a live test method for actual oil level of a transformer oil storage tank is provided.
(1) Measuring oil pressure at an oil taking port of the transformer: and installing a liquid pressure sensor 1 at an oil extraction port of the transformer oil tank to obtain transformer oil pressure p at the oil extraction port. The pressure sensor 1 and the oil extraction port can be connected through threads or other modes, and when testing is performed, an oil drain valve at the oil extraction port is opened, so that the pressure sensor 1 can be in contact with transformer oil, and pressure is tested. The requirement of the pressure sensor 1 in the invention can bear the pressure of the transformer oil at the oil taking port, the precision meets the measurement requirement, and other aspects, such as the principle of the pressure sensor, and the like are not specified. For the convenience of subsequent calculation, the pressure sensor 1 should have a function of displaying the pressure value in situ or transmitting the measured pressure value by a wired or wireless manner.
(2) Calculating the oil level height of the oil storage cabinet: because the liquid pressure only depends on the density of the liquid and the height of the liquid level, and is irrelevant to the shape of the container, and because the transformer oil tank and the transformer oil tank are connected through the gas relay and the auxiliary pipeline, namely the transformer oil in the transformer oil tank and the transformer oil in the transformer oil tank are communicated, the vertical distance between the oil level in the oil tank and the oil extraction port can be calculated according to the oil pressure at the oil extraction port, as shown in the h of fig. 1. Since the liquid density is related to temperature, when calculating the pressure p, the oil density is calculated according to the oil temperature indicated by the transformer oil temperature meter, the oil temperature in the transformer oil tank is inconsistent with the oil temperature in the oil storage tank, and the temperatures of all points in the transformer are inconsistent, so the transformer oil density is not constant, but considering that the oil storage tank and the sum of the oil in the oil storage tank and the connecting pipeline of the transformer oil tank are smaller than the oil quantity in the transformer oil tank (the oil storage tank capacity of a general transformer is configured according to 10 percent of the oil tank capacity), and the transformer oil temperature difference of all points in the transformer oil tank is smaller, the oil surface height of the oil storage tank calculated by adopting the transformer oil density corresponding to the temperature indicated by the transformer oil temperature meter and combining the measured liquid pressure at the oil taking port and the actual oil surface height error are in an acceptable range, h is calculated as: here, p is the measured oil pressure at the oil extraction port, ρ is the density of transformer oil, g is the gravitational acceleration, and by this formula, the vertical height h of the actual oil level in the oil storage tank relative to the oil extraction port can be calculated.
(3) Measuring the distance and angle between the test point and the oil extraction port: and selecting a place which is free from shielding objects between the oil taking port of the transformer and the oil storage cabinet of the transformer as a test point, and measuring the distance and the angle between the test point and the oil taking port. In one embodiment, the specific step is to fix the test device host 2 at the test point. The testing device host 2 mainly comprises a laser ranging module and an attitude measuring sensor. The laser ranging module is used for driving a beam of laser from the test point to the oil extraction port, and based on the phase test principle, the connecting distance between the test point and the oil extraction port is obtained, as shown in d 1 in fig. 1, d 1 is calculated as follows:
measuring the phase difference between the emitted first laser and the received first laser, wherein the phase difference is caused by the propagation distance of laser waves, and the distance is twice the round trip distance, namely the distance from the test point to the oil extraction port;
The actual length of the laser round-trip path is calculated by using the phase difference and combining the wavelength of the laser, and the formula is as follows: Wherein d 1 is the single pass distance from the test point to the oil extraction port, Is the phase difference, λ is the wavelength of the laser, and d 2 is calculated the same as d 1.
The attitude measurement sensor is used for measuring the pitch angle between the horizontal plane and the connecting line between the two points of the test point and the oil extraction port, which are the laser emitted by the laser ranging module 3, as shown by theta 1 in figure 1. In order to ensure that the angle theta 1 measured by the attitude measurement sensor is a pitch angle between the laser beam directed from the test point to the oil extraction port and the horizontal plane, the attitude measurement sensor should be fixed together with the laser ranging module and correct the angle before testing.
(4) Calculating the vertical height between the test point and the oil surface at the oil extraction port: according to d 1、θ1, the vertical height between the test point and the oil level in the oil storage tank can be calculated, as shown in h 1 in fig. 1, and as can be seen from fig. 1, h 1＝d1×sinθ1.
(5) Measuring the distance and angle between the test point and a certain point on the surface of the oil storage cabinet: in one embodiment, the specific steps are that a laser ranging module in the testing device host 2 is used to pump a beam of laser from a test point to the surface of the oil storage cabinet, based on phase ranging or other testing principles, the link distance between the test point and the point irradiated by the laser on the surface of the oil storage cabinet is obtained, as shown by d 2 in fig. 1, and an attitude measuring sensor is used to measure the pitch angle between the link between the two points and the horizontal plane, as shown by θ 2 in fig. 1.
(6) Calculating the vertical height between the test point and the oil surface in the oil storage cabinet: according to d 2、θ2, the vertical height between the test point and the oil level in the oil storage tank can be calculated, as shown in h 2 in fig. 1, and as can be seen from fig. 1, h 2＝d2×sinθ2.
(7) Indicating the oil level on the outer surface of the oil storage cabinet: and adjusting theta 2 to enable h 2＝h-h1＝h2', and then obtaining the position of the point irradiated by the laser on the surface of the oil storage cabinet as the actual oil level in the oil storage cabinet. In this step, the adjustment of θ 2 is realized by changing the position of the irradiation point of the laser beam emitted by the laser ranging module in the testing device host 2 on the surface of the oil conservator. In one embodiment, the adjustment θ 2 is performed manually by a tester, and the test device host 2 has the function of continuously measuring and displaying h 2, so that the tester can compare the value of h 2 with the value of h 2' until the tester considers the two to be substantially equal.
In another embodiment, the adjustment θ 2 is performed automatically by the test device host 2, and the test device host 2 is mounted on a fixed support with a computing control module and a drive device capable of adjusting the host angle θ 2. The calculation control module of the test device host 2 compares the value of h 2 with the value of h 2 'after the first calculation of h 2 is completed, if h 2>h2' is found, Then θ 2 is reduced by the drive step, then the control module again performs the numerical calculation for h 2 and compares it with the numerical value for h 2 ', so that the adjustment is continued until the measurement error h 2-h2' is less than the program set point. In contrast, the calculation control module compares the value of h 2 with the value of h 2 'after the first calculation of h 2, and if h 2<h2' is found, Then θ 2 is increased by the step of the driving device, then the control module again performs the numerical calculation of h 2 and compares with the numerical value of h 2', so that the adjustment is continued until the measurement error h 2'-h2 is smaller than the program set value.
Those of ordinary skill in the art will appreciate that: the discussion of any of the embodiments above is merely exemplary and is not intended to suggest that the scope of the invention is limited to these examples; the technical features of the above embodiments or in the different embodiments may also be combined within the idea of the invention, the steps may be implemented in any order and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.
The present invention is intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Therefore, any omission, modification, equivalent replacement, improvement, etc. of the present invention should be included in the scope of the present invention.
Claims (6)
1. The live-line testing method for the actual oil level of the transformer oil storage cabinet is characterized by comprising the following steps of:
S1: a liquid pressure sensor is arranged at an oil taking port of a transformer oil tank to obtain transformer oil pressure p at the oil taking port of the transformer oil tank;
S2: calculating the vertical height h of the actual oil level in the transformer oil storage tank from the oil taking port of the transformer oil tank according to a liquid pressure formula by using the measured transformer oil pressure p and the transformer oil density and temperature at the oil taking port of the transformer oil tank;
S3: selecting a test point, installing a testing device host, measuring the distance and angle between the test point and an oil taking port, emitting first laser from the testing device host to the oil taking port, acquiring the connecting line distance d 1 between the test point and the oil taking port of a transformer oil tank based on a phase ranging principle, and measuring the connecting line between the two points and the pitch angle theta 1 of a horizontal plane by using an attitude measuring sensor;
S4: calculating the vertical height between the test point and the oil surface at the oil extraction port: calculating the vertical height h 1 of the oil level at the position of the oil taking port and the test point according to d 1、θ1;
s5: measuring the distance and angle between the test point and a certain point on the surface of the oil storage cabinet: the second laser is shot from the test point to any point on the surface of the oil storage cabinet, the connecting line distance d 2 between the test point and the point irradiated by the laser on the surface of the oil storage cabinet is obtained based on the phase ranging principle, and the connecting line between the two points and the pitch angle theta 2 of the horizontal plane are measured by using the attitude measuring sensor;
The phase ranging principle calculation d 1 includes:
transmitting first laser from a test point to the surface of the oil storage cabinet and receiving the first laser reflected from the surface of the oil storage cabinet;
measuring the phase difference between the emitted first laser and the received first laser, wherein the phase difference is caused by the propagation distance of laser waves, and the distance is twice the round trip distance, namely the distance from the test point to the oil extraction port;
The actual length of the laser round-trip path is calculated by using the phase difference and combining the wavelength of the laser, and the formula is as follows: Wherein d 1 is the single pass line distance from the test point to the oil extraction port, Is the phase difference, λ is the wavelength of the laser;
the phase ranging principle calculation d 2 includes:
transmitting second laser from the test point to the oil extraction port, and receiving the second laser reflected from the oil extraction port;
Measuring a phase difference between the transmitted second laser and the received second laser, wherein the phase difference is caused by the propagation distance of the laser wave, and the distance is twice the round trip distance, namely the distance from the test point to the oil extraction port;
The actual length of the laser round-trip path is calculated by using the phase difference and combining the wavelength of the laser, and the formula is as follows: Wherein d 2 is the single pass link distance between the test point and the laser irradiation point on the surface of the oil storage cabinet, Is the phase difference, λ is the wavelength of the laser;
S6: calculating the vertical height between the test point and the laser irradiation point on the surface of the oil storage cabinet: calculating the vertical height h 2 between the test point and the laser irradiation point on the surface of the oil storage cabinet according to d 2、θ2;
S7: indicating the oil level on the outer surface of the oil storage cabinet: and adjusting the angle theta 2 to enable the angle h 2＝h-h1, and then obtaining the actual oil level in the oil storage cabinet at the position of the point irradiated by the laser on the surface of the oil storage cabinet.
2. The method for live testing of the actual oil level of the transformer oil storage tank according to claim 1, wherein h 1 in S4 is calculated as: h 1＝d1×sinθ1.
3. The method for live testing of the actual oil level of the transformer oil storage tank according to claim 1, wherein h 2 in S6 is calculated as: h 2＝d2×sinθ2.
4. The method for live testing of the actual oil level of the transformer oil storage tank according to claim 1, wherein h in S2 is calculated as: wherein p is the transformer oil pressure, ρ is the density of the transformer oil, and g is the gravitational acceleration.
5. The method for live testing of the actual oil level of the transformer oil storage tank according to claim 1, wherein the test points are selected as follows: and a place without shielding objects is arranged between the test point and the oil taking port of the transformer and between the test point and the oil storage cabinet of the transformer.
6. The method for testing the actual oil level of the transformer oil storage cabinet in an electrified manner according to claim 1, wherein the testing device host comprises a laser ranging module and an attitude measuring sensor, the laser ranging module is used for emitting first laser and second laser, and the attitude measuring sensor is used for measuring an included angle between a connecting line of two points and a horizontal plane.
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| CN209541846U (en) * | 2018-11-29 | 2019-10-25 | 国网上海市电力公司 | Intelligent transformer oil level detection system based on pressure capsule system |
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| CN108444566A (en) * | 2018-03-14 | 2018-08-24 | 国网天津市电力公司电力科学研究院 | Oil level gauge for transformer based on pressure sensing and temperature adjustmemt |
| CN108597819B (en) * | 2018-06-12 | 2019-12-17 | 国家电网公司 | transformer oil level inspection device and method |
| CN114136367A (en) * | 2021-11-06 | 2022-03-04 | 国网山西省电力公司电力科学研究院 | Transformer oil conservator defect monitoring device and detection method based on edge calculation |
| CN114001793A (en) * | 2021-12-02 | 2022-02-01 | 刘闯闯 | Oil level detection device and method for transformer oil conservator |
| CN117537885A (en) * | 2023-11-15 | 2024-02-09 | 广东电网有限责任公司 | Oil level discriminating device and method |
| CN117419787A (en) * | 2023-12-18 | 2024-01-19 | 华海智汇技术有限公司 | Water level and width measuring method and system based on laser ranging |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN209541846U (en) * | 2018-11-29 | 2019-10-25 | 国网上海市电力公司 | Intelligent transformer oil level detection system based on pressure capsule system |
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