CN105547418B - Optical fiber type oil level sensor performance detection device and detection method for transformer - Google Patents
Optical fiber type oil level sensor performance detection device and detection method for transformer Download PDFInfo
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- CN105547418B CN105547418B CN201510889129.7A CN201510889129A CN105547418B CN 105547418 B CN105547418 B CN 105547418B CN 201510889129 A CN201510889129 A CN 201510889129A CN 105547418 B CN105547418 B CN 105547418B
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 65
- 238000001514 detection method Methods 0.000 title claims abstract description 23
- 239000000446 fuel Substances 0.000 claims description 43
- 238000005259 measurement Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 5
- 230000001934 delay Effects 0.000 claims description 3
- 230000001960 triggered effect Effects 0.000 claims description 2
- 230000007547 defect Effects 0.000 abstract description 3
- 238000012795 verification Methods 0.000 abstract description 3
- 230000003287 optical effect Effects 0.000 description 8
- 239000004973 liquid crystal related substance Substances 0.000 description 6
- 230000008859 change Effects 0.000 description 4
- 239000002775 capsule Substances 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 230000005389 magnetism Effects 0.000 description 2
- 230000009347 mechanical transmission Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000029058 respiratory gaseous exchange Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/20—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of apparatus for measuring liquid level
Abstract
The invention provides a performance detection device and a detection method of an optical fiber type oil level sensor for a transformer, wherein the device comprises a first oil storage cabinet and a second oil storage cabinet, wherein the upper part of the first oil storage cabinet is communicated with the lower part of the second oil storage cabinet through an oil pipe; the device also comprises an insulating oil level control system for controlling the oil amount in the first oil conservator and the second oil conservator, and a standard oil level sensor and an optical fiber oil level sensor which are arranged in the first oil conservator and the second oil conservator; the standard oil level sensor is connected with the insulating oil level control system, and the optical fiber type oil level sensor is connected with the oil level acquisition system. The technical scheme provided by the invention can detect the oil level measuring accuracy and the mechanical service life of the optical fiber type oil level sensor, overcomes the defects that the optical fiber type oil level sensor in the prior art is lack of detection and verification when being connected to a network and the performance and the reliability cannot be verified, and provides technical support for the reliable operation of the optical fiber type oil level sensor.
Description
Technical Field
The invention relates to a detection device and a detection method, in particular to a performance detection device and a performance detection method of an optical fiber type oil level sensor for a transformer.
Background
Along with the rapid increase of power consumption, the problem of unbalanced power utilization is particularly obvious, many places face the problem of power utilization shortage, and power grid interconnection needs to be carried out in the place of power utilization shortage to develop an extra-high voltage strong intelligent power grid. The power grid becomes the foundation and important component of the industrialized and information-based social development; meanwhile, the power grid continuously absorbs industrial and informatization achievements, so that various advanced technologies are integrated and applied in primary power transmission and transformation equipment, and the intelligent degree of the transformer equipment is greatly improved.
The oil conservator is one of the main components of the transformer, and has the function of compensating the volume expansion or contraction of the insulating oil caused by the temperature change, and ensuring that the oil filling equipment body is filled with the oil all the time. The oil level is to ensure that oil exists in the oil storage cabinet to avoid overheating or insulation failure caused by too low oil level of the transformer.
The large transformer requires a fully-sealed oil conservator to isolate the insulating oil from the outside air, so as to prevent the insulating oil from absorbing moisture and being oxidized to reduce the insulating property of the insulating oil. The common oil conservators are of three types, namely open type, capsule type/diaphragm type and bellows type. The oil level in the oil conservator is important to indicate, an oil level gauge monitors the oil level in the oil conservator, and an alarm is needed when the oil level is too high or too low, but at present, a plurality of false oil level fault alarms occur in a transformer substation, so that the false oil level faults are caused by a plurality of reasons and have different fault phenomena, for example, the tubular oil level indicator may have the following faults: 1) air in the pressure oil bag is not exhausted, so that the oil level is very small in change along with the temperature; 2) the oil level indicator leaks oil, an oil level indicator connecting pipe is broken or an oil level indicator oil discharge screw loosens to leak oil, so that the oil level indicator gradually drops to be very low or even zero; 3) the oil level meter breathing plug is screwed too tightly to be communicated with air, so that the oil level has small change along with the temperature; 4) the oil pressing bag is cracked or leaked to pollute the insulating oil of the device body, so that the color of the insulating oil is blackened and polluted.
The magnetic needle type oil level indicator may have the following defects: 1) the drive mechanism and capsule become entangled resulting in an oil level indication that is substantially invariant with temperature. 2) The float or the connecting rod takes oil, which results in the oil level being indicated as zero. 3) The magnetic needle fails, resulting in the oil level being indicated as zero or full. 4) The drive link flexes, resulting in a zero or no change in the oil level indication.
The temperature of the transformer rises, the volume of oil expands, the oil level of the oil conservator rises, otherwise, the oil level is reduced, the factory information of the transformer equipment can give the oil temperature and oil level curves of the oil conservator, corresponding temperature oil level curves are given for different oil quantities, an overhaul worker injects oil into the equipment according to an oil temperature oil level device, the operating condition of the transformer equipment is monitored through oil temperature oil level indication by an operating worker, the oil temperature and the oil level are timely mastered and compared with the corresponding curve graphs, and the actual operating state of the transformer equipment can be mastered. The false temperature and the false oil level can cause equipment failure or cause an operator to suddenly stop the equipment, if the oil temperature and the oil level of the transformer can be monitored in real time and directly, false alarm or false alarm can be avoided, unnecessary power failure of the transformer is avoided, and unnecessary loss is brought to a user.
The optical fiber type oil level sensor is used for direct measurement, the problems of false oil level and the like do not exist, partial application is already carried out in recent years, but the optical fiber type oil level measuring system is lack of detection and verification when being connected to the network, the performance and reliability of the optical fiber type oil level measuring system are not verified, and if the optical fiber type oil level measuring system is directly installed on the site and then verified, the optical fiber type oil level sensor is difficult to replace and maintain.
Disclosure of Invention
In order to solve the above problems in the prior art, the present invention provides an optical fiber type oil level sensor performance detection device for a transformer.
The technical scheme provided by the invention is as follows: the performance detection device comprises a first oil storage cabinet and a second oil storage cabinet, wherein the upper part of the first oil storage cabinet is communicated with the lower part of the second oil storage cabinet through an oil pipe; the improvement is that: the device also comprises an insulating oil level control system for controlling the oil amount in the first oil conservator and the second oil conservator, and a standard oil level sensor and an optical fiber oil level sensor which are arranged in the first oil conservator and the second oil conservator; the standard oil level sensor is connected with the insulating oil level control system, and the optical fiber type oil level sensor is connected with the oil level acquisition system.
Preferably, the first oil conservator and the second oil conservator have the same size and structure; the bottom of the side wall of the oil conservator is provided with an interface and a cover plate arranged on the interface; the cover plate is provided with a flange interface with adjustable size; the optical fiber type oil level sensor is fixed to the bottoms of the side walls of the first oil storage cabinet and the second oil storage cabinet through the flange interfaces.
Preferably, the insulating oil level control system comprises a power supply, a voltage regulator, a contactor, an oil pump, a PLC controller and an oil level sensor, wherein an output end of the power supply is connected with an input end of the voltage regulator, an output end of the regulator is connected with an input terminal of the contactor, an output terminal of the contactor is connected with an input end of the oil pump, and an output end of the oil pump is connected with the first oil storage cabinet and the second oil storage cabinet through the oil pipe respectively; and the control end of the contactor and the oil level sensor are respectively connected with the PLC.
Further, the fuel level sensor includes a first fuel level sensor, a second fuel level sensor, a third fuel level sensor, and a fourth fuel level sensor; the first oil conservator and the second oil conservator are arranged on the same horizontal plane; the first oil level sender and the second oil level sender are mounted on the same side wall of the first conservator at different heights; the third oil level sender and the fourth oil level sender are mounted on the same side wall of the second conservator at different heights; the first fuel level sender is mounted at the same height as the third fuel level sender; the mounting height of the second fuel level sender is the same as the mounting height of the fourth fuel level sender.
Further, the shells of the first oil conservator and the second oil conservator are grounded.
Preferably, the oil level acquisition system comprises an optical fiber demodulator and a computer, wherein the input end of the optical fiber demodulator is connected with the output end of the optical fiber oil level sensor, and the output end of the optical fiber demodulator is connected with the computer; the optical fiber oil level sensor measures oil level information in the first oil conservator and the second oil conservator, converts the oil level information into optical signals and outputs the optical signals to the optical fiber demodulator; and the optical fiber demodulator receives the optical signal uploaded by the optical fiber oil level sensor, converts the optical signal into an electric signal and uploads the electric signal to a computer for display.
Preferably, the standard oil level sensor is a light reflection type oil level sensor, the light reflection type oil level sensor is connected with a PLC (programmable logic controller), and the PLC is connected with a liquid crystal display frequency; the light reflection type oil level sensor measures oil levels in the first oil storage cabinet and the second oil storage cabinet and transmits the detected oil level information to the PLC long; and the PLC records oil level information and controls the liquid crystal display screen to display the oil level information.
Preferably, still install in first oil conservator with the second oil conservator and be used for measuring the traditional oil level sensor of the interior insulating oil level of oil conservator, traditional oil level sensor is the formula oil level sensor is inhaled to float mechanical transmission magnetism.
Another object of the present invention is to provide a method for detecting the performance of an optical fiber type oil level sensor for a transformer, which is implemented by the above detecting device, wherein: the method comprises the following steps:
A. starting the oil pump to rotate in the positive direction, so that the insulating oil in the second oil storage cabinet flows to the first oil storage cabinet through the oil pipe;
B. after the first oil level sensor detects the highest oil level, the PLC is triggered to start the contactor, and the contactor controls the oil pump to rotate in the opposite direction, so that the insulating oil in the first oil storage cabinet flows to the second oil storage cabinet through the oil pipe;
C. the second oil level sensor triggers the PLC after detecting the lowest oil level, the PLC controls the oil pump to stop rotating through the contactor, and the oil pump stops receiving signals after 5min of delay;
D. the third oil level sensor triggers the PLC to start the contactor after detecting the highest oil level, and the contactor controls the oil pump to rotate in the positive direction, so that the insulating oil in the second oil storage cabinet flows to the first oil storage cabinet through the oil pipe;
E. the fourth oil level sensor triggers the PLC after detecting the lowest oil level; the PLC controls the oil pump to stop rotating through the contactor, and delays for 5min to stop receiving signals;
F. skipping to the step B;
the oil level lifting times in the first oil storage cabinet and the second oil storage cabinet are set by the PLC; the optical fiber oil level sensor and the standard oil level sensor detect the oil levels in the first oil conservator and the second oil conservator; and calculating the measurement accuracy of the optical fiber type oil level sensor according to the measurement results of the optical fiber type oil level sensor and the standard oil level sensor.
Compared with the closest prior art, the invention has the following remarkable progress:
the performance detection device for the optical fiber type oil level sensor for the transformer provided by the invention has the advantages that the cyclic lifting of the internal oil levels of the two oil storage cabinets is realized by adopting the two oil storage cabinets with completely consistent size structures and the insulating oil control system, the oil level information collection in the oil level lifting process is simultaneously detected by adopting the optical fiber type oil level sensor and the standard oil level sensor, the large-amount collection of oil level data can be realized, the oil level measurement accuracy and the mechanical service life of the optical fiber type oil level sensor can be detected, the defects that the optical fiber type oil level sensor is lack of detection and verification when the optical fiber type oil level sensor is connected to a network and the performance and reliability cannot be verified in the prior art are overcome, and the.
Drawings
Fig. 1 is a schematic structural diagram of an optical fiber fuel level sensor performance detection device for a transformer according to the present invention.
Wherein 1-is grounded; 2-a power supply; 3-a voltage regulator; 4-a contactor; 5-standard oil level sensor; 6-a PLC controller; 7-an oil pump; 8-a flow meter; 9-fiber optic fuel level sensor; 10-fiber demodulation instrument; 11-a computer; 12-conventional fuel level sensor; 13-a first fuel level sensor; 14-a second fuel level sensor; 15-a third fuel level sensor; 16-a fourth fuel level sensor; 17-a first conservator; 18-second conservator.
Detailed Description
The following describes the present invention in further detail with reference to fig. 1.
In the following description, a detailed structure will be presented for a thorough understanding of embodiments of the invention. It is apparent that the implementation of the embodiments of the present invention is not limited to the specific details familiar to those skilled in the art. The following detailed description of the preferred embodiments of the invention, however, the invention is capable of other embodiments in addition to those detailed.
The structure of the performance detection device of the optical fiber type oil level sensor 9 for the transformer provided by the invention is shown in figure 1: the detection device comprises a first oil conservator 17 and a second oil conservator 18, wherein the upper part of the first oil conservator 17 is communicated with the lower part of the second oil conservator 18 through an oil pipe; the device also comprises an insulating oil level control system for controlling the oil amount in the first oil conservator 17 and the second oil conservator 18, and a standard oil level sensor 5 and an optical fiber oil level sensor 9 which are arranged in the first oil conservator 17 and the second oil conservator 18; the standard oil level sensor 5 is connected with the insulating oil level control system, and the optical fiber oil level sensor 9 is connected with the oil level acquisition system.
The first oil conservator 17 and the second oil conservator 18 are the same in size and structure; an interface and a square cover plate arranged on the interface are reserved at the bottom of the side wall of the oil conservator; the square cover plate is provided with a flange interface with adjustable size, so that various sensors can be conveniently connected; the optical fiber type oil level sensor 9 is fixed at the bottom of the side walls of the first oil conservator 17 and the second oil conservator 18 through the flange interfaces.
The insulating oil level control system comprises a power supply 2, a voltage regulator 3, a contactor 4, an oil pump 7, a PLC (programmable logic controller) 6 and an oil level sensor, wherein the output end of the power supply 2 is connected with the input end of the voltage regulator 3, the output end of the regulator is connected with the input terminal of the contactor 4, the output terminal of the contactor 4 is connected with the input end of the oil pump 7, and the output end of the oil pump 7 is connected with the first oil storage cabinet 17 and the second oil storage cabinet 18 through oil pipes respectively; the oil pipe is also provided with a flowmeter 8 for measuring the quantity of the insulating oil flowing through the oil pipe; the control end of the contactor 4 and the oil level sensor are respectively connected with the PLC 6.
The fuel level sensors include a first fuel level sensor 13, a second fuel level sensor 14, a third fuel level sensor 15 and a fourth fuel level sensor 16; the first oil conservator 17 and the second oil conservator 18 are arranged on the same horizontal plane; the first oil level sensor 13 and the second oil level sensor 14 are installed on the same side wall of the first oil conservator 17 at different heights, wherein the installation high pressure of the first oil level is higher than that of the second oil level sensor 14, and the second oil level sensor 14 is installed on the bottom of the side wall of the first oil conservator 17; the third level sender 15 and the fourth level sender 16 are mounted on the same side wall of the second conservator 18 at different heights; the mounting height of the first fuel level sender 13 is the same as the mounting height of the third fuel level sender 15; the second fuel level sender 14 is mounted at the same height as the fourth fuel level sender 16.
The housings of the first conservator 17 and the second conservator 18 are grounded 1.
The oil level acquisition system comprises an optical fiber demodulator 10 and a computer 11, wherein the input end of the optical fiber demodulator 10 is connected with the output end of the optical fiber oil level sensor 9, and the output end of the optical fiber demodulator is connected with the computer 11; the optical fiber oil level sensor 9 measures oil level information in the first oil conservator 17 and the second oil conservator 18, converts the oil level information into optical signals and outputs the optical signals to the optical fiber demodulator 10; the optical fiber demodulator 10 receives the optical signal uploaded by the optical fiber oil level sensor 9, converts the optical signal into an electrical signal, and uploads the electrical signal to the computer 11 for display.
The standard oil level sensor 5 is a light reflection type oil level sensor, the light reflection type oil level sensor is connected with a PLC (programmable logic controller) 6, and the PLC 6 is connected with a liquid crystal display frequency; the light reflection type oil level sensor measures the oil levels in the first oil conservator 17 and the second oil conservator 18 and transmits the detected oil level information to the PLC 6; and the PLC 6 records oil level information and controls the liquid crystal display screen to display the oil level information.
Still install in first oil conservator 17 with second oil conservator 18 and be used for measuring traditional oil level sensor 12 of the interior insulating oil level of oil conservator, traditional oil level sensor 12 is the magnetism type oil level sensor of float mechanical transmission, certainly also can be other kinds of oil level sensor. The measured value of the conventional fuel level sensor 12 can be read directly or through a remote display on a liquid crystal display screen; the measurement accuracy and the mechanical life of the optical fiber type oil level sensor 9 and the conventional oil level sensor 12 can be simultaneously checked by installing the conventional oil level sensor 12, and the data comparison between the optical fiber type oil level sensor 9 and the conventional oil level sensor 12 can be increased, so that the performance check of the optical fiber type oil level sensor 9 is realized.
The performance detection of the optical fiber type oil level sensor 9 for the transformer, which can be realized by the detection device, is as follows:
A. starting the oil pump 7 to rotate in the positive direction, so that the insulating oil in the second oil storage cabinet 18 flows to the first oil storage cabinet 17 through the oil pipe;
B. after detecting the highest oil level, the first oil level sensor 13 triggers the PLC 6 to start the contactor 4, and the contactor 4 controls the oil pump 7 to rotate in the opposite direction, so that the insulating oil in the first oil storage cabinet 17 flows to the second oil storage cabinet 18 through an oil pipe;
C. the second oil level sensor 14 triggers the PLC 6 after detecting the lowest oil level, the PLC 6 controls the oil pump 7 to stop rotating through the contactor 4, and the receiving of signals is stopped after 5min delay;
D. after detecting the highest oil level, the third oil level sensor 15 triggers the PLC to start the contactor 4, and the contactor 4 controls the oil pump 7 to rotate in the positive direction, so that the insulating oil in the second oil storage cabinet 18 flows to the first oil storage cabinet 17 through the oil pipe;
E. the fourth oil level sensor 16 triggers the PLC controller 6 after detecting the lowest oil level; the PLC 6 controls the oil pump 7 to stop rotating through the contactor 4, and delays for 5min to stop receiving signals;
F. skipping to the step B;
the oil level lifting times in the first oil conservator 17 and the second oil conservator 18 are set by the PLC 6; the oil level can also be changed by manually starting and stopping the contactor 4; the mechanical life of the traditional oil level sensor 12 requires that the maximum oil level is changed into the minimum oil level for 1000 times of total evaluation; the mechanical life examination times of the optical fiber oil level sensor 9 is 2 times of the mechanical life examination times of the traditional oil level sensor 12; and checking whether the optical fiber oil level sensor 9 can normally work in the 2000-time circulating lifting process of changing the high-pressure oil level into the lowest oil level.
The optical fiber type oil level sensor 9, the standard oil level sensor 5 and the conventional oil level sensor 12 simultaneously detect the oil levels in the first oil conservator 17 and the second oil conservator 18; the three measured data can be simultaneously accessed to a liquid crystal display screen through a video access device, and indicating values of the three devices under different oil levels are displayed; from the measurements of the optical fibre fuel level sensor 9, the standard fuel level sensor 5 and the conventional fuel level sensor 12, the measurement accuracy of the optical fibre fuel level sensor 9 and the conventional fuel level sensor 12 at different fuel levels can be calculated. It is also possible to detect the performance of the optical fibre fuel level sensor 9 relative to the sensor fuel level sensor.
Finally, it should be noted that: although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can make modifications and equivalents to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is set forth in the claims appended hereto.
Claims (1)
1. A performance detection method of an optical fiber type oil level sensor for a transformer is disclosed, wherein a performance detection device of the optical fiber type oil level sensor for the transformer comprises a first oil storage cabinet and a second oil storage cabinet, wherein the upper part of the first oil storage cabinet is communicated with the lower part of the second oil storage cabinet through an oil pipe; the device also comprises an insulating oil level control system for controlling the oil amount in the first oil conservator and the second oil conservator, and a standard oil level sensor and an optical fiber oil level sensor which are arranged in the first oil conservator and the second oil conservator; the standard oil level sensor is connected with the insulating oil level control system, and the optical fiber type oil level sensor is connected with the oil level acquisition system;
the insulating oil level control system comprises a power supply, a voltage regulator, a contactor, an oil pump, a PLC (programmable logic controller) and an oil level sensor, wherein the output end of the power supply is connected with the input end of the voltage regulator, the output end of the voltage regulator is connected with the input terminal of the contactor, the output terminal of the contactor is connected with the input end of the oil pump, and the output end of the oil pump is connected with the first oil storage cabinet and the second oil storage cabinet through the oil pipe respectively; the control end of the contactor and the oil level sensor are respectively connected with the PLC;
the fuel level sender comprises a first fuel level sender, a second fuel level sender, a third fuel level sender and a fourth fuel level sender; the first oil conservator and the second oil conservator are arranged on the same horizontal plane; the first oil level sender and the second oil level sender are mounted on the same side wall of the first conservator at different heights; the third oil level sender and the fourth oil level sender are mounted on the same side wall of the second conservator at different heights; the first fuel level sender is mounted at the same height as the third fuel level sender; the mounting height of the second fuel level sender is the same as the mounting height of the fourth fuel level sender;
the method comprises the following steps:
A. starting the oil pump to rotate in the positive direction, so that the insulating oil in the second oil storage cabinet flows to the first oil storage cabinet through the oil pipe;
B. after the first oil level sensor detects the highest oil level, the PLC is triggered to start the contactor, and the contactor controls the oil pump to rotate in the opposite direction, so that the insulating oil in the first oil storage cabinet flows to the second oil storage cabinet through the oil pipe;
C. the second oil level sensor triggers the PLC after detecting the lowest oil level, the PLC controls the oil pump to stop rotating through the contactor, and the oil pump stops receiving signals after 5min of delay;
D. the third oil level sensor triggers the PLC to start the contactor after detecting the highest oil level, and the contactor controls the oil pump to rotate in the positive direction, so that the insulating oil in the second oil storage cabinet flows to the first oil storage cabinet through the oil pipe;
E. the fourth oil level sensor triggers the PLC after detecting the lowest oil level; the PLC controls the oil pump to stop rotating through the contactor, and delays for 5min to stop receiving signals;
F. skipping to the step B;
the oil level lifting times in the first oil storage cabinet and the second oil storage cabinet are set by the PLC; the optical fiber oil level sensor and the standard oil level sensor detect the oil levels in the first oil conservator and the second oil conservator; and calculating the measurement accuracy of the optical fiber type oil level sensor according to the measurement results of the optical fiber type oil level sensor and the standard oil level sensor.
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| US11719559B2 (en) | 2019-10-24 | 2023-08-08 | Palo Alto Research Center Incorporated | Fiber optic sensing system for grid-based assets |
| US11585692B2 (en) * | 2019-10-24 | 2023-02-21 | Palo Alto Research Center Incorporated | Fiber optic sensing system for grid-based assets |
| CN112504397A (en) * | 2020-11-11 | 2021-03-16 | 广东电网有限责任公司 | Method and system for distinguishing oil level state of transformer |
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| IT245000Y1 (en) * | 1998-12-11 | 2002-03-14 | Giuseppe Giannelli | FLOAT WITH RIBBON JOINT |
| CN202771910U (en) * | 2012-07-31 | 2013-03-06 | 山东电力集团公司济南供电公司 | Transformer oil storage tank for online oil supplement device |
| CA2921406C (en) * | 2013-08-19 | 2019-11-12 | Total Sa | Method for monitoring a well or a reservoir containing a fluid, and apparatus for using the same |
| CN103471684A (en) * | 2013-09-17 | 2013-12-25 | 辽宁中新自动控制集团有限公司 | Flotation liquid level reflection-type ultrasonic test instrument and test method |
| CN104266715A (en) * | 2014-09-24 | 2015-01-07 | 中山欧麦克仪器设备有限公司 | Automatic calibration gas medium ultrasonic level gauge |
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