CN114018364A - Oil level detection temperature correction system and method for closed oil-filled power equipment - Google Patents
Oil level detection temperature correction system and method for closed oil-filled power equipment Download PDFInfo
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- CN114018364A CN114018364A CN202111136222.2A CN202111136222A CN114018364A CN 114018364 A CN114018364 A CN 114018364A CN 202111136222 A CN202111136222 A CN 202111136222A CN 114018364 A CN114018364 A CN 114018364A
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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
- G01F23/22—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 measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—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 measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/296—Acoustic waves
- G01F23/2962—Measuring transit time of reflected waves
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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
- G01F23/22—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 measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—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 measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/296—Acoustic waves
- G01F23/2968—Transducers specially adapted for acoustic level indicators
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- Acoustics & Sound (AREA)
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- Thermal Sciences (AREA)
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- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
The invention belongs to the technical field of electrical equipment fault diagnosis, and particularly relates to a system and a method for detecting and correcting the oil level of closed oil-filled power equipment, wherein the system comprises an ultrasonic probe, an energy converter, a transmitting control and receiving circuit and a controller; the controller is used for controlling the transmitting control and receiving circuit to generate ultrasonic waves, receiving echoes received by the transmitting control and receiving circuit, and performing temperature correction on the speed of the ultrasonic waves transmitted in the insulating oil to obtain an accurate oil level; the transmitting control and receiving circuit is used for generating corresponding ultrasonic waves under the control of the controller; the transducer is used for converting the ultrasonic waves generated by the transmitting control and receiving circuit and transmitting the ultrasonic waves to the ultrasonic probe and transmitting the echo acquired by the ultrasonic probe to the transmitting control and receiving circuit; the ultrasonic probe is used for detecting the oil level of the insulating oil, collecting echoes and transmitting the echoes to the transducer. The invention can effectively deal with the accurate detection of the oil level of the closed electric oil-filled equipment under the condition of oil temperature change.
Description
Technical Field
The invention belongs to the technical field of electrical equipment fault diagnosis, and particularly relates to a closed oil-filled power equipment oil level detection temperature correction system and method.
Background
In the operation process of the closed oil-filled power equipment, due to the reasons of mechanical transmission failure, air leakage of an oil storage cabinet capsule, oil leakage of an oil level gauge, blockage of a respirator and the like, the phenomenon of false oil level usually exists, and the normal operation of the power equipment is seriously influenced. The oil level detection meter based on the ultrasonic detection principle can realize the quick measurement of the oil level of the closed oil-filled power equipment, and the oil temperature of the oil-filled equipment is influenced by the operating conditions and generally changes within the range of 30-70 ℃ because the temperature has certain influence on the propagation speed of ultrasonic waves. Therefore, the oil level detected by the oil level detecting gauge based on the ultrasonic detection principle at present is inaccurate.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a system and a method for detecting and correcting the oil level of closed oil-filled power equipment. The specific technical scheme of the invention is as follows:
a closed oil-filled power equipment oil level detection temperature correction system comprises an ultrasonic probe, an energy converter, a transmission control and receiving circuit and a controller; the controller, the transmitting control and receiving circuit, the transducer and the ultrasonic probe are sequentially connected; the controller is used for controlling the transmitting control and receiving circuit to generate ultrasonic waves, receiving echoes received by the transmitting control and receiving circuit, and performing temperature correction on the speed of the ultrasonic waves transmitted in the insulating oil to obtain an accurate oil level; the transmitting control and receiving circuit is used for generating corresponding ultrasonic waves under the control of the controller, transmitting the ultrasonic waves to the transducer, receiving echoes transmitted by the transducer, and transmitting the echoes to the controller for processing; the transducer is used for converting the ultrasonic waves generated by the transmitting control and receiving circuit and transmitting the ultrasonic waves to the ultrasonic probe and transmitting the echo acquired by the ultrasonic probe to the transmitting control and receiving circuit; the ultrasonic probe is used for transmitting ultrasonic waves to the closed oil-filled power equipment, detecting the oil level of insulating oil of the closed oil-filled power equipment, collecting echo waves and transmitting the echo waves to the transducer.
Preferably, the oil-filled power equipment further comprises a display module, wherein the display module is connected with the controller and is used for displaying the temperature and the oil level of the insulating oil in the closed oil-filled power equipment.
Preferably, the ultrasonic probe is a liquid medium type ultrasonic probe.
Preferably, the oil-filled power equipment further comprises a temperature sensor, wherein the temperature sensor is connected with the controller and used for collecting the temperature of the insulating oil in the closed oil-filled power equipment and transmitting the collected temperature to the controller.
Preferably, the controller obtains the accurate oil level according to the echo specifically by:
inputting the type and the oil temperature of the insulating oil, and performing temperature correction on the propagation speed of the ultrasonic wave in the insulating oil to obtain the corrected propagation speed V of the ultrasonic wave in the insulating oilRepair the，
The formula for calculating the oil level is: h ═ VRepair theT/2, t is the time of transmission of the ultrasonic waves in the insulating oil.
Preferably, the types of the insulating oil comprise 10# insulating oil, 25# insulating oil and 45# insulating oil.
Preferably, the temperature correction formula of the propagation speed of the ultrasonic wave in the 10# insulating oil is VTrimming tool 10＝1471.5-3.334T10Wherein T is10Is the temperature of No. 10 insulating oil.
Preferably, the temperature correction formula of the propagation speed of the ultrasonic wave in 25# insulating oil is VRepair 25＝1479.1-3.539T25Wherein T is25Is the temperature of 25# insulating oil.
Preferably, the temperature correction formula of the propagation speed of the ultrasonic wave in the 45# insulating oil is VTrimming 45＝1495.5-3.821T45Wherein T is45Is the temperature of No. 45 insulating oil.
A method for correcting oil level detection temperature of closed oil-filled power equipment comprises the following steps:
s1: placing an ultrasonic probe at the bottom of an oil conservator of the closed oil-filled power equipment to detect the oil level;
s2: inputting the type of insulating oil and the oil temperature to a controller;
s3: the controller controls the transmitting control and receiving circuit to generate ultrasonic waves, and the ultrasonic waves are output to the ultrasonic probe through the transducer;
s4: the ultrasonic probe collects an echo signal of ultrasonic waves and inputs the echo signal to the controller through the transducer and the transmitting control and receiving circuit in sequence;
s5: and the controller calculates the corrected oil level of the oil conservator according to the input type and the oil temperature of the insulating oil and the collected echo signal.
The invention has the beneficial effects that: the invention provides a system and a method for correcting oil level detection temperature of closed oil-filled power equipment, wherein the system comprises an ultrasonic probe, an energy converter, a transmitting control and receiving circuit and a controller; the controller, the transmitting control and receiving circuit, the transducer and the ultrasonic probe are sequentially connected; the controller is used for controlling the transmitting control and receiving circuit to generate ultrasonic waves, receiving echoes received by the transmitting control and receiving circuit, and performing temperature correction on the speed of the ultrasonic waves transmitted in the insulating oil to obtain an accurate oil level; the transmitting control and receiving circuit is used for generating corresponding ultrasonic waves under the control of the controller, transmitting the ultrasonic waves to the transducer, receiving echoes transmitted by the transducer, and transmitting the echoes to the controller for processing; the transducer is used for converting the ultrasonic waves generated by the transmitting control and receiving circuit and transmitting the ultrasonic waves to the ultrasonic probe and transmitting the echo acquired by the ultrasonic probe to the transmitting control and receiving circuit; the ultrasonic probe is used for transmitting ultrasonic waves to the closed oil-filled power equipment, detecting the oil level of insulating oil of the closed oil-filled power equipment, collecting echo waves and transmitting the echo waves to the transducer. The invention provides a method for correcting the propagation speed of ultrasonic waves in insulating oil during oil level detection of closed electric oil-filled equipment in a non-constant temperature environment on the basis that the propagation speed of the ultrasonic waves in a medium changes along with the environmental temperature. Repeated experiments under various environmental temperatures and different grades of insulating oil prove that the technical scheme provided by the invention has high correction precision, and can effectively and accurately detect the oil level of the closed electric oil filling equipment under the condition of oil temperature change.
The invention provides a temperature correction method for ultrasonic wave propagation speed in 10# insulating oil, 25# insulating oil and 45# insulating oil, which is the first creation of the invention and has higher detection precision on the oil level of closed oil-filled power equipment.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
FIG. 1 is a schematic diagram of the system of the present invention;
FIG. 2 is a schematic diagram of a transmit control and receive circuit of the present invention;
FIG. 3 is a temperature correction curve of the propagation velocity of ultrasonic waves in 25# insulating oil according to the present invention;
fig. 4 is the oil level of the oil-filled equipment obtained after automatic correction.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
As shown in fig. 1, the oil level detection temperature correction system for the enclosed oil-filled power equipment comprises an ultrasonic probe, a transducer, a transmission control and receiving circuit and a controller; the controller, the transmitting control and receiving circuit, the transducer and the ultrasonic probe are sequentially connected; the controller is used for controlling the transmitting control and receiving circuit to generate ultrasonic waves, receiving echoes received by the transmitting control and receiving circuit, and performing temperature correction on the speed of the ultrasonic waves transmitted in the insulating oil to obtain an accurate oil level; the transmitting control and receiving circuit is used for generating corresponding ultrasonic waves under the control of the controller, transmitting the ultrasonic waves to the transducer, receiving echoes transmitted by the transducer, and transmitting the echoes to the controller for processing; the transducer is used for converting the ultrasonic waves generated by the transmitting control and receiving circuit and transmitting the ultrasonic waves to the ultrasonic probe and transmitting the echo acquired by the ultrasonic probe to the transmitting control and receiving circuit; the ultrasonic probe is used for transmitting ultrasonic waves to the closed oil-filled power equipment, detecting the oil level of insulating oil of the closed oil-filled power equipment, collecting echo waves and transmitting the echo waves to the transducer.
The invention also comprises a display module, wherein the display module is connected with the controller and is used for displaying the temperature and the oil level of the insulating oil in the closed oil-filled power equipment.
Wherein, the ultrasonic probe is a liquid medium type ultrasonic probe. The controller is an 80C552 singlechip minimum system. The transducer is a piezoelectric transducer. The controller is connected with a key.
The controller obtains an accurate oil level according to the echo, and specifically comprises the following steps:
inputting the type and the oil temperature of the insulating oil, and performing temperature correction on the propagation speed of the ultrasonic wave in the insulating oil by using a controller to obtain the corrected ultrasonic wave in the insulating oilVelocity V propagating in the rim oilRepair theThe formula for calculating the oil level is: h ═ VRepair theT/2, t is the time of transmission of the ultrasonic waves in the insulating oil.
The types of the insulating oil comprise 10# insulating oil, 25# insulating oil and 45# insulating oil. The temperature correction formula of the ultrasonic wave propagation speed in 10# insulating oil is VTrimming tool 10＝1471.5-3.334T10Wherein T is10Is the temperature of No. 10 insulating oil. The temperature correction formula of the ultrasonic wave propagation speed in 25# insulating oil is VRepair 25＝1479.1-3.539T25Wherein T is25Is the temperature of 25# insulating oil. The temperature correction formula of the ultrasonic wave propagation speed in 45# insulating oil is VTrimming 45＝1495.5-3.821T45Wherein T is45Is the temperature of No. 45 insulating oil.
As shown in fig. 2, U9 and T2 complete the driving of the probe by the measures of electromagnetic interference resistance and noise interference adopted by the transmission control and receiving circuit, so that the probe generates mechanical vibration waves; echo signals received by the probe are filtered and amplified by U10, U11 and Q6; the U10 circuit is a band-pass circuit, only gates the frequency near the echo signal of the probe, filters other frequency interference; the U8 and the U11 form an automatic gain circuit, when the echo signal is weak, the gain is automatically increased, and when the echo signal is strong, the gain is automatically decreased. Q6 is a fixed high gain. The whole circuit is surrounded by a shielding shell to prevent external interference from entering.
The working principle of the invention is as follows: and starting the system, and controlling the transmitting control and receiving circuit to generate ultrasonic waves by the controller when the type of the insulating oil and the temperature of the insulating oil are input, wherein the ultrasonic waves are output to the ultrasonic probe through the transducer, and the ultrasonic probe acquires echo signals of the ultrasonic waves and inputs the echo signals to the controller through the transducer, the transmitting control and receiving circuit in sequence. The controller performs temperature correction on the propagation speed of the ultrasonic wave in the insulating oil to obtain the corrected propagation speed V of the ultrasonic wave in the insulating oilRepair theThe formula for calculating the oil level is: h ═ VRepair theT/2, t is the time of transmission of the ultrasonic waves in the insulating oil. Wherein if the insulating oil is No. 10 insulating oil, the controller is according to formula VTrimming tool 10＝1471.5-3.334T10For the speed of the ultrasonic wave propagating in the insulating oilMaking a correction wherein T10Is the temperature of No. 10 insulating oil. If the insulating oil is 25# insulating oil, the controller according to formula VRepair 25＝1479.1-3.539T25Correcting the speed of propagation of the ultrasonic waves in the insulating oil, T25Is the temperature of 25# insulating oil. If the insulating oil is 45# insulating oil, the controller is according to formula VTrimming 45＝1495.5-3.821T45Correcting the speed of propagation of the ultrasonic waves in the insulating oil, T45Is the temperature of No. 45 insulating oil.
As shown in Table 1, Table 1 shows the results of comparison between the cases of detection using the present invention and detection without the present invention, and 1420m/s is generally taken in accordance with the wave velocity of ultrasonic waves in petroleum products before correction.
TABLE 1 comparison of oil level measurements before and after correction
As can be seen from table 1, the oil temperature obtained before the speed of propagation in the insulating oil is corrected is generally higher and has a larger deviation from the actual oil level, whereas the oil level obtained after the speed of propagation in the insulating oil is corrected by the present invention is more accurate.
The invention provides a method for correcting the propagation speed of ultrasonic waves in insulating oil during oil level detection of closed electric oil-filled equipment in a non-constant temperature environment on the basis that the propagation speed of the ultrasonic waves in a medium changes along with the environmental temperature. Repeated experiments under various environmental temperatures and different grades of insulating oil prove that the technical scheme provided by the invention has high correction precision, and can effectively and accurately detect the oil level of the closed electric oil filling equipment under the condition of oil temperature change. The invention provides a temperature correction method for ultrasonic wave propagation speed in 10# insulating oil, 25# insulating oil and 45# insulating oil, which is the first creation of the invention and has higher detection precision on the oil level of closed oil-filled power equipment.
Example two:
a closed oil-filled power equipment oil level detection temperature correction method is applied to a closed oil-filled power equipment oil level detection temperature correction system, and the system comprises an ultrasonic probe, a transducer, a transmitting control and receiving circuit and a controller; the controller, the transmitting control and receiving circuit, the transducer and the ultrasonic probe are sequentially connected; the controller is used for controlling the transmitting control and receiving circuit to generate ultrasonic waves, receiving echoes received by the transmitting control and receiving circuit, and performing temperature correction on the speed of the ultrasonic waves transmitted in the insulating oil to obtain an accurate oil level; the transmitting control and receiving circuit is used for generating corresponding ultrasonic waves under the control of the controller, transmitting the ultrasonic waves to the transducer, receiving echoes transmitted by the transducer, and transmitting the echoes to the controller for processing; the transducer is used for converting the ultrasonic waves generated by the transmitting control and receiving circuit and transmitting the ultrasonic waves to the ultrasonic probe and transmitting the echo acquired by the ultrasonic probe to the transmitting control and receiving circuit; the ultrasonic probe is used for transmitting ultrasonic waves to the closed oil-filled power equipment, detecting the oil level of insulating oil of the closed oil-filled power equipment, collecting echo waves and transmitting the echo waves to the transducer.
The invention also comprises a display module, wherein the display module is connected with the controller and is used for displaying the temperature and the oil level of the insulating oil in the closed oil-filled power equipment.
Wherein, the ultrasonic probe is a liquid medium type ultrasonic probe. The controller is an 80C552 singlechip minimum system. The transducer is a piezoelectric transducer. The controller is connected with a key.
The controller obtains an accurate oil level according to the echo, and specifically comprises the following steps:
inputting the type and the oil temperature of the insulating oil, and performing temperature correction on the propagation speed of the ultrasonic waves in the insulating oil by using a controller to obtain the corrected propagation speed V of the ultrasonic waves in the insulating oilRepair theThe formula for calculating the oil level is: h ═ VRepair theT/2, t is the time of transmission of the ultrasonic waves in the insulating oil.
The types of the insulating oil comprise No. 10 insulating oil,25# insulating oil and 45# insulating oil. The temperature correction formula of the ultrasonic wave propagation speed in 10# insulating oil is VTrimming tool 10＝1471.5-3.334T10Wherein T is10Is the temperature of No. 10 insulating oil. The temperature correction formula of the ultrasonic wave propagation speed in 25# insulating oil is VRepair 25＝1479.1-3.539T25Wherein T is25Is the temperature of 25# insulating oil. The temperature correction formula of the ultrasonic wave propagation speed in 45# insulating oil is VTrimming 45＝1495.5-3.821T45Wherein T is45Is the temperature of No. 45 insulating oil. The method comprises the following steps:
s1: placing an ultrasonic probe at the bottom of an oil conservator of the closed oil-filled power equipment to detect the oil level;
s2: inputting the type of insulating oil and the oil temperature to a controller;
s3: the controller controls the transmitting control and receiving circuit to generate ultrasonic waves, and the ultrasonic waves are output to the ultrasonic probe through the transducer;
s4: the ultrasonic probe collects an echo signal of ultrasonic waves and inputs the echo signal to the controller through the transducer and the transmitting control and receiving circuit in sequence;
s5: and the controller calculates the corrected oil level of the oil conservator according to the input type and the oil temperature of the insulating oil and the collected echo signal. The controller performs temperature correction on the propagation speed of the ultrasonic wave in the insulating oil to obtain the corrected propagation speed V of the ultrasonic wave in the insulating oilRepair theThe formula for calculating the oil level is: h ═ VRepair theT/2, t is the time of transmission of the ultrasonic waves in the insulating oil. Wherein if the insulating oil is No. 10 insulating oil, the controller is according to formula VTrimming tool 10＝1471.5-3.334T10Correcting the speed of propagation of the ultrasonic waves in the insulating oil, T10Is the temperature of No. 10 insulating oil. If the insulating oil is 25# insulating oil, the controller according to formula VRepair 25＝1479.1-3.539T25Correcting the speed of propagation of the ultrasonic waves in the insulating oil, T25Is the temperature of 25# insulating oil. If the insulating oil is 45# insulating oil, the controller is according to formula VTrimming 45＝1495.5-3.821T45Correcting the speed of propagation of the ultrasonic waves in the insulating oil, T45Is the temperature of No. 45 insulating oil.
The invention provides a method for correcting the propagation speed of ultrasonic waves in insulating oil during oil level detection of closed electric oil-filled equipment in a non-constant temperature environment on the basis that the propagation speed of the ultrasonic waves in a medium changes along with the environmental temperature. Repeated experiments under various environmental temperatures and different grades of insulating oil prove that the technical scheme provided by the invention has high correction precision, and can effectively and accurately detect the oil level of the closed electric oil filling equipment under the condition of oil temperature change. The invention provides a temperature correction method for ultrasonic wave propagation speed in 10# insulating oil, 25# insulating oil and 45# insulating oil, which is the first creation of the invention and has higher detection precision on the oil level of closed oil-filled power equipment.
Example three:
the invention also comprises a temperature sensor which is connected with the controller and used for collecting the temperature of the insulating oil in the closed oil-filled power equipment and transmitting the collected temperature to the controller. The temperature sensor selects a thermistor, and the singlechip reads a direct-current voltage signal, so that the anti-interference capability is strong. The other steps are the same as those of the first embodiment.
Those of ordinary skill in the art will appreciate that the elements of the examples described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the components of the examples have been described above generally in terms of their functionality in order to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present application, it should be understood that the division of the unit is only one division of logical functions, and other division manners may be used in actual implementation, for example, multiple units may be combined into one unit, one unit may be split into multiple units, or some features may be omitted.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (10)
1. The utility model provides a closed oil-filled power equipment oil level detects temperature correction system which characterized in that: comprises an ultrasonic probe, an energy converter, a transmitting control and receiving circuit and a controller; the controller, the transmitting control and receiving circuit, the transducer and the ultrasonic probe are sequentially connected; the controller is used for controlling the transmitting control and receiving circuit to generate ultrasonic waves, receiving echoes received by the transmitting control and receiving circuit, and performing temperature correction on the speed of the ultrasonic waves transmitted in the insulating oil to obtain an accurate oil level; the transmitting control and receiving circuit is used for generating corresponding ultrasonic waves under the control of the controller, transmitting the ultrasonic waves to the transducer, receiving echoes transmitted by the transducer, and transmitting the echoes to the controller for processing; the transducer is used for converting the ultrasonic waves generated by the transmitting control and receiving circuit and transmitting the ultrasonic waves to the ultrasonic probe and transmitting the echo acquired by the ultrasonic probe to the transmitting control and receiving circuit; the ultrasonic probe is used for transmitting ultrasonic waves to the closed oil-filled power equipment, detecting the oil level of insulating oil of the closed oil-filled power equipment, collecting echo waves and transmitting the echo waves to the transducer.
2. The oil level detection temperature correction system for the enclosed oil-filled electrical equipment according to claim 1, characterized in that: the display module is connected with the controller and used for displaying the temperature and the oil level of the insulating oil in the closed oil-filled power equipment.
3. The oil level detection temperature correction system for the enclosed oil-filled electrical equipment according to claim 1, characterized in that: the ultrasonic probe is a liquid medium type ultrasonic probe.
4. The oil level detection temperature correction system for the enclosed oil-filled electrical equipment according to claim 1, characterized in that: still include temperature sensor, temperature sensor is connected with the controller for gather the temperature of the interior insulating oil of closed oil-filled power equipment, and transmit the temperature of gathering to the controller.
5. The oil level detection temperature correction system for the enclosed oil-filled electrical equipment according to claim 1, characterized in that: the controller obtains an accurate oil level according to the echo, and specifically comprises the following steps:
inputting the type and the oil temperature of the insulating oil, and performing temperature correction on the propagation speed of the ultrasonic wave in the insulating oil to obtain the corrected propagation speed V of the ultrasonic wave in the insulating oilRepair the，
The formula for calculating the oil level is: h ═ VRepair theT/2, t is the time of transmission of the ultrasonic waves in the insulating oil.
6. The oil level detection temperature correction system for the enclosed oil-filled electrical power equipment according to claim 5, characterized in that: the types of the insulating oil comprise 10# insulating oil, 25# insulating oil and 45# insulating oil.
7. The oil level detection temperature correction system for the enclosed oil-filled electrical equipment according to claim 6, characterized in that: the temperature correction formula of the ultrasonic wave propagation speed in 10# insulating oil is VTrimming tool 10＝1471.5-3.334T10Wherein T is10Is the temperature of No. 10 insulating oil.
8. The oil level detection temperature correction system for the enclosed oil-filled electrical equipment according to claim 6, characterized in that: the propagation speed of ultrasonic wave is 25 #)The temperature correction formula in the crude oil is VRepair 25＝1479.1-3.539T25Wherein T is25Is the temperature of 25# insulating oil.
9. The oil level detection temperature correction system for the enclosed oil-filled electrical equipment according to claim 6, characterized in that: the temperature correction formula of the ultrasonic wave propagation speed in 45# insulating oil is VTrimming 45＝1495.5-3.821T45Wherein T is45Is the temperature of No. 45 insulating oil.
10. A method for correcting oil level detection temperature of closed oil-filled power equipment is characterized by comprising the following steps: the method comprises the following steps:
s1: placing an ultrasonic probe at the bottom of an oil conservator of the closed oil-filled power equipment to detect the oil level;
s2: inputting the type of insulating oil and the oil temperature to a controller;
s3: the controller controls the transmitting control and receiving circuit to generate ultrasonic waves, and the ultrasonic waves are output to the ultrasonic probe through the transducer;
s4: the ultrasonic probe collects an echo signal of ultrasonic waves and inputs the echo signal to the controller through the transducer and the transmitting control and receiving circuit in sequence;
s5: and the controller calculates the corrected oil level of the oil conservator according to the input type and the oil temperature of the insulating oil and the collected echo signal.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115326172A (en) * | 2022-07-16 | 2022-11-11 | 戴天智能科技（上海）有限公司 | Transformer oil level detection method and system, storage medium and intelligent terminal |
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| CN105737944A (en) * | 2016-02-29 | 2016-07-06 | 国家电网公司 | Device and method for detecting oil level of oil storage cabinet of corrugated pipe tube transformer |
| CN105758499A (en) * | 2016-04-18 | 2016-07-13 | 南京理工大学 | Non-contact type liquid level detection system and method based on ultrasonic pulse echo method |
| CN110736522A (en) * | 2019-08-26 | 2020-01-31 | 广西电网有限责任公司电力科学研究院 | oil level detection method for sealed oil-filled equipment |
| CN112539805A (en) * | 2020-11-30 | 2021-03-23 | 北京航天控制仪器研究所 | Ultrasonic liquid level measurement system and method for sound velocity compensation by using DTS (delay tolerant system) |
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| CN115326172B (en) * | 2022-07-16 | 2024-04-02 | 戴天智能科技(上海)股份有限公司 | Transformer oil level detection method, system, storage medium and intelligent terminal |
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