CN112504397A - Method and system for distinguishing oil level state of transformer - Google Patents
Method and system for distinguishing oil level state of transformer Download PDFInfo
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- CN112504397A CN112504397A CN202011253321.4A CN202011253321A CN112504397A CN 112504397 A CN112504397 A CN 112504397A CN 202011253321 A CN202011253321 A CN 202011253321A CN 112504397 A CN112504397 A CN 112504397A
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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
- G01F23/30—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 floats
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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
- G01F23/80—Arrangements for signal processing
- G01F23/802—Particular electronic circuits for digital processing equipment
- G01F23/804—Particular electronic circuits for digital processing equipment containing circuits handling parameters other than liquid level
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Abstract
The invention discloses a method and a system for judging the oil level state of a transformer. The method for judging the oil level state of the transformer comprises the following steps: obtaining an oil temperature and oil level function according to a factory oil level curve of the transformer; acquiring the actual oil temperature and the actual oil level of the transformer; obtaining a standard oil level according to the actual oil temperature and the oil temperature and oil level function; and comparing the actual oil level with the standard oil level, and if the deviation of the actual oil level exceeds a preset range, determining that the actual oil level is abnormal and generating an alarm signal. The invention can realize the real-time automatic monitoring of the oil level state of the transformer, accelerate the abnormal response, improve the judgment precision and reduce the misjudgment.
Description
Technical Field
The embodiment of the invention relates to the technical field of transformer state monitoring, in particular to a method and a system for judging the oil level state of a transformer.
Background
The transformer is a core device of a transformer substation and has the functions of converting voltage and transmitting electric energy. The working state of the transformer is important for the normal operation of the whole transformer substation. The transformer oil is filled in the whole box body of the transformer, and the effects of insulation, heat dissipation and arc extinction are achieved.
In the routine inspection of the transformer, the oil level is consistently observed by observing the data of an oil level gauge and an oil temperature gauge of an oil conservator and combining an oil level curve provided by a manufacturer to judge whether the oil level of the transformer is in a normal area. The existing manual inspection is carried out according to an inspection plan, the inspection time points are discrete, workers need to walk to a site for inspection, time waste is caused, and quick response cannot be realized due to abnormal oil level; the manual comparison of oil temperature and oil pressure data is long in time consumption, and misjudgment of the oil level is easily caused. Therefore, the conventional oil level state determination method has the problems of slow response of oil level abnormality and easy erroneous determination.
Disclosure of Invention
The embodiment of the invention provides a method and a system for judging the oil level state of a transformer, which are used for realizing the real-time automatic monitoring of the oil level state of the transformer, accelerating abnormal response, improving the judgment precision and reducing the misjudgment.
In a first aspect, an embodiment of the present invention provides a method for determining an oil level state of a transformer, where the method includes:
obtaining an oil temperature and oil level function according to a factory oil level curve of the transformer;
acquiring the actual oil temperature and the actual oil level of the transformer;
obtaining a standard oil level according to the actual oil temperature and the oil temperature and oil level function;
and comparing the actual oil level with the standard oil level, and if the deviation of the actual oil level exceeds a preset range, determining that the actual oil level is abnormal and generating an alarm signal.
Optionally, the comparing the actual oil level with the standard oil level, and determining that the actual oil level is abnormal if the deviation of the actual oil level exceeds a preset range includes:
subtracting the standard oil level from the actual oil level to obtain an oil level difference value;
and comparing the absolute value of the oil level difference with an error coefficient, and if the absolute value of the oil level difference is greater than the error coefficient, determining that the actual oil level is abnormal.
Optionally, the comparing the actual oil level with the standard oil level, and determining that the actual oil level is abnormal if the deviation of the actual oil level exceeds a preset range includes:
subtracting the standard oil level from the actual oil level to obtain an oil level difference value;
dividing the absolute value of the oil level difference value by an error coefficient to obtain a judgment coefficient;
and if the judgment coefficient is larger than 1, judging that the actual oil level is abnormal.
Optionally, the generating an alarm signal comprises: an electronic warning signboard is issued.
Optionally, the method for determining the oil level state of the transformer further includes: and displaying the actual oil level by adopting a display screen.
Optionally, the method for determining the oil level state of the transformer further includes:
after the transformer operates for a preset time period, adjusting the oil level curve to obtain an adjustment curve;
and adjusting the oil temperature and oil level function according to the adjustment curve to obtain a standard database of the oil temperature and oil level function.
In a second aspect, an embodiment of the present invention provides a system for determining an oil level state of a transformer, where the system includes:
the sensing module is arranged on the transformer and used for acquiring the actual oil temperature and the actual oil level of the transformer and converting the actual oil temperature and the actual oil level into electric signals to be output;
the measurement and control cabinet is electrically connected with the sensing module and is used for analyzing and outputting an oil temperature signal and an oil level signal according to the electric signal;
a controller electrically connected with the measurement and control cabinet for implementing the method according to any of claims 1-6;
and the background monitor is electrically connected with the controller and used for alarming according to the alarm signal.
Optionally, the background monitor is further electrically connected with the measurement and control cabinet; the background monitor is also used for displaying the oil level signal.
Optionally, the sensing module comprises:
the oil level sensing unit is arranged in an oil conservator of the transformer and is used for collecting the actual oil level of the transformer;
and the oil temperature sensing unit is arranged in the box body of the transformer and used for acquiring the actual oil temperature of the transformer.
Optionally, the oil level sensing unit comprises a floating ball connecting rod and a position sensor; the floating ball connecting rod is positioned in the oil conservator; the position sensor is connected with the floating ball connecting rod and used for collecting a position signal of the floating ball connecting rod to represent the actual oil level of the transformer;
the oil temperature sensing unit comprises a thermal resistor and a transmitter; the thermal resistor is positioned inside a box body of the transformer; the transmitter is connected with the thermal resistor and used for acquiring a resistance signal of the thermal resistor to represent the actual oil temperature of the transformer.
According to the method for judging the oil level state of the transformer, the oil temperature and oil level function is obtained according to the factory oil level curve of the transformer, after the actual oil temperature is obtained, the numerical value of the standard oil level can be directly obtained through the oil temperature and oil level function, workers do not need to compare the oil level curve, the standard oil level is more accurate and convenient to obtain, and the obtaining time is saved. After the accurate standard oil level is obtained, the actual oil level is compared with the standard oil level, whether the actual oil level is abnormal or not is judged according to whether the deviation of the actual oil level exceeds a preset range or not, and the probability of misjudgment can be reduced. And the judgment method can be completed by a controller, so that the real-time automatic detection of the oil level of the transformer is convenient to realize, and an alarm is quickly given out when the oil level is abnormal. Therefore, compared with the prior art, the oil level state monitoring method and device can achieve real-time automatic monitoring of the oil level state of the transformer, accelerate abnormal response, improve judgment precision and reduce misjudgment.
Drawings
Fig. 1 is a schematic flow chart of a method for determining an oil level state of a transformer according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an oil level curve for an oil conservator according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart of another method for determining the oil level status of a transformer according to an embodiment of the present invention;
FIG. 4 is a schematic flow chart of a method for determining the oil level status of a transformer according to another embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a system for determining the oil level status of a transformer according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a controller according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of another oil level state determination system for a transformer according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
The embodiment of the invention provides a method for judging the oil level state of a transformer, which is suitable for oil level monitoring in the operation process of an oil-immersed power transformer and can be executed by a system for judging the oil level state of the transformer. Fig. 1 is a schematic flow chart of a method for determining an oil level state of a transformer according to an embodiment of the present invention. As shown in fig. 1, the method for determining the oil level state of the transformer comprises the following steps:
and S110, obtaining an oil temperature and oil level function according to a factory oil level curve of the transformer.
When the transformer leaves the factory, a manufacturer can provide an oil storage cabinet oil level curve, as shown in fig. 2, so as to provide a reference rule that the oil level of the transformer changes along with the oil temperature under normal conditions for users. Referring to fig. 2, the curve of the oil level of the conservator is not a straight line, i.e. there is no linear relationship between the oil temperature and the oil level of the transformer, therefore, if a standard oil level at the actual oil temperature is to be obtained, it is necessary to obtain an oil temperature and oil level function (the oil temperature and oil level function is denoted as q (x), where x denotes the oil temperature and q denotes the oil level). For example, the oil temperature and oil level function q (x) may be obtained by curve fitting or interpolation.
And S120, acquiring the actual oil temperature and the actual oil level of the transformer.
The actual oil temperature of the transformer can be acquired by a temperature sensor or an infrared analyzer and other equipment; the actual oil level may be obtained by a position sensor or the like. Compared with the traditional method for manually observing the oil level of the oil storage cabinet to obtain the oil level and obtain the oil temperature according to the oil temperature gauge, the method provided by the embodiment has the advantages that the obtained actual oil temperature and the obtained actual oil level are more accurate and closer to the actual value, the method is not limited by manual inspection, and the oil temperature and the oil level state of the transformer can be monitored at any time.
And S130, obtaining a standard oil level according to the actual oil temperature and the oil temperature and oil level function.
Alternatively, after the oil temperature and oil level function is obtained, the functional relation may be recorded, and after the actual oil temperature is obtained, the actual oil temperature is brought into the oil temperature and oil level function, so that the standard oil level may be calculated. Or after the oil temperature and oil level function is obtained, each temperature and the corresponding standard oil level can be recorded according to the accuracy of temperature measurement to form an oil temperature and oil level meter, and after the actual oil temperature is obtained, the standard oil level can be obtained through table lookup. In summary, the embodiment of the invention can quickly and accurately obtain the corresponding standard oil level for each actual temperature.
S140, comparing the actual oil level with the standard oil level, judging that the actual oil level is abnormal if the deviation of the actual oil level exceeds a preset range, and generating an alarm signal.
When the oil level of the transformer is too high, oil can overflow when the transformer runs in a full-load or overload state, and if the oil level is in a full-seal arrangement, the pressure in an oil tank can be increased; if the oil level is too low, the oil level in the high-voltage bushing is reduced, electricity is discharged in the bushing, and safety accidents are caused.
Therefore, as shown in fig. 2, in a normal state, the upper and lower deviations of the actual oil level (indicated by the dots) from the standard oil level cannot exceed the preset range μ; once the deviation of the actual oil level exceeds the preset range μ, an abnormal state point (shown as a triangular dot) is identified. The preset range is determined by integrating the accuracy of the data acquisition method, the environment and other influence factors. When the actual oil level is at the abnormal state point, an alarm signal needs to be generated to remind a worker to process the fault, so that the fault is prevented from being further expanded. The manner of generating the alarm signal may be, for example, an audible and visual alarm or the emission of an electronic warning signboard, etc.
According to the method for judging the oil level state of the transformer, the oil temperature and oil level function is obtained according to the factory oil level curve of the transformer, after the actual oil temperature is obtained, the numerical value of the standard oil level can be directly obtained through the oil temperature and oil level function, workers do not need to compare the oil level curve, the standard oil level is more accurate and convenient to obtain, and the obtaining time is saved. After the accurate standard oil level is obtained, the actual oil level is compared with the standard oil level, whether the actual oil level is abnormal or not is judged according to whether the deviation of the actual oil level exceeds a preset range or not, and the probability of misjudgment can be reduced. And the judgment method can be completed by a controller, so that the real-time automatic detection of the oil level of the transformer is convenient to realize, and an alarm is quickly given out when the oil level is abnormal. Therefore, the embodiment of the invention can realize the real-time automatic monitoring of the oil level state of the transformer, accelerate the abnormal response, improve the judgment precision and reduce the misjudgment.
On the basis of the above embodiments, optionally, after the actual oil temperature of the transformer is obtained, whether the actual oil temperature is within the safe range may be determined according to the operation state of the transformer, and when the actual oil temperature is abnormal, an alarm is directly given, so as to notify a worker to investigate and process the fault as soon as possible.
On the basis of the above embodiments, optionally, the display screen may also be used to display the actual oil level, so as to realize visualization of the oil level state. For example, after the actual oil level of the transformer is acquired, whether the actual oil level is abnormal or not, the data can be directly transmitted to a display screen for displaying; the display can be performed in the form of data points, curves or texts. Or may display only the oil level data at the time of abnormality. So that the worker can visually acquire the oil level condition of the transformer. Preferably, the actual oil temperature and the actual oil level can be displayed, the visualization of the comprehensive state of the oil temperature and the oil level is realized, and a curve graph or a data table is finally formed for storage, so that the data can be checked and analyzed when a fault occurs or daily maintenance is performed.
In addition to the above embodiments, there are various ways of determining that the actual oil level is abnormal, and some of them will be described below, but the present application is not limited thereto.
Fig. 3 is a schematic flow chart of another method for determining an oil level status of a transformer according to an embodiment of the present invention. Referring to fig. 3, in an embodiment, optionally, comparing the actual oil level with a standard oil level, and determining that the actual oil level is abnormal if the deviation of the actual oil level exceeds a preset range includes:
and S210, subtracting the standard oil level from the actual oil level to obtain an oil level difference value.
S220, comparing the absolute value of the oil level difference with the error coefficient, and if the absolute value of the oil level difference is larger than the error coefficient, judging that the actual oil level is abnormal.
In the embodiment of the invention, whether the actual oil level is abnormal can be determined only by two steps of subtraction and comparison, and the determination method is simple and convenient.
Fig. 4 is a schematic flow chart of another method for determining an oil level state of a transformer according to an embodiment of the present invention. Referring to fig. 4, in another embodiment, optionally, comparing the actual oil level with a standard oil level, and determining that the actual oil level is abnormal if the deviation of the actual oil level exceeds a preset range includes:
s310, subtracting the standard oil level from the actual oil level to obtain an oil level difference value;
s320, dividing the absolute value of the oil level difference value by the error coefficient to obtain a judgment coefficient;
because the error coefficients may be different at different temperatures or under different operating conditions of the transformer, the judgment coefficient obtained by dividing the absolute value of the oil level difference by the error coefficient can ensure that the judgment condition does not change along with the change of the error coefficient only by comparing the judgment coefficient with 1.
And S330, if the judgment coefficient is larger than 1, judging that the actual oil level is abnormal.
Wherein, when the determination coefficient is larger than 1, indicating that the deviation value of the actual oil level from the standard oil level has exceeded the error coefficient, it is possible to determine that the actual oil level is abnormal.
On the basis of the above embodiments, optionally, as the operation time of the transformer increases, the operation characteristic of the transformer changes, and likewise, the oil level curve may also change. Therefore, the method for judging the oil level state of the transformer further comprises the following steps:
after the transformer operates for a preset time period, adjusting the oil level curve to obtain an adjustment curve; and adjusting the oil temperature and oil level function according to the adjustment curve to obtain a standard database of the oil temperature and oil level function.
The value of the preset time period can be set according to actual conditions, for example, the service time of the transformer is long, the characteristics of the transformer do not change greatly in the first few years of use, and the preset time period can be set in units of years, for example, the oil level curve is adjusted once every two years; after running for many years, the characteristics of the transformer can be greatly changed due to the influence of severe running environment and aging of devices, and the value of the preset time period can be shortened at the moment.
Since the oil level curve changes, the oil temperature and oil level function necessarily changes correspondingly, and the standard oil level obtained according to the oil temperature and oil level function at the same oil temperature also changes. If the calculated standard oil level is deviated, the oil level state may be erroneously determined. Therefore, a standard database of the oil temperature and oil level function is formed and stored along with the operation of the transformer, and the accuracy of the actual oil level state judgment is improved. And, forming a standard database is beneficial to researching the aging characteristic of the transformer.
The embodiment of the invention also provides a system for judging the oil level state of the transformer, which can be used for realizing the method for judging the oil level state of the transformer provided by the embodiments and has corresponding beneficial effects.
Fig. 5 is a schematic structural diagram of a system for determining an oil level state of a transformer according to an embodiment of the present invention. As shown in fig. 5, the system for determining the oil level state of the transformer includes: the monitoring system comprises a sensing module 110, a measurement and control cabinet 120, a controller 130 and a background monitor 140.
The sensing module 110 is installed on the transformer 200, and is used for collecting the actual oil temperature and the actual oil level of the transformer 200, and converting the actual oil temperature and the actual oil level into electric signals for output; the measurement and control cabinet 120 is electrically connected with the sensing module 110, and is used for analyzing and outputting an oil temperature signal and an oil level signal according to the electrical signal; the controller 130 is electrically connected to the measurement and control cabinet 120, and is configured to implement the method for determining the oil level status of the transformer according to any embodiment of the present invention; the background monitor 140 is electrically connected to the controller 130 for alarming according to the alarm signal.
Alternatively, the electrical signal output by the sensing module 110 may be a current signal.
According to the oil level state distinguishing system for the transformer, provided by the embodiment of the invention, the oil temperature and oil level function is obtained through the controller 130 according to the factory oil level curve of the transformer, after the actual oil temperature is obtained, the numerical value of the standard oil level is directly obtained through the oil temperature and oil level function, workers do not need to compare the oil level curve, the standard oil level is more accurately and conveniently obtained, and the obtaining time is saved. After obtaining the accurate standard oil level, the controller 130 compares the actual oil level with the standard oil level, and determines whether the actual oil level is abnormal according to whether the deviation of the actual oil level exceeds a preset range, so as to reduce the probability of erroneous determination. In addition, the system can realize real-time automatic detection of the oil level of the transformer and quickly give an alarm when the oil level is abnormal. Therefore, the embodiment of the invention can realize the real-time automatic monitoring of the oil level state of the transformer, accelerate the abnormal response, improve the judgment precision and reduce the misjudgment.
Fig. 6 is a schematic structural diagram of a controller according to an embodiment of the present invention. On the basis of the foregoing embodiments, the present embodiment explains a specific structure of the controller, and optionally, the controller includes: an acquisition unit 310, a first calculation unit 320, a second calculation unit 330, a function unit 340 and a comparison unit 350.
Wherein, the acquisition unit 310 is electrically connected with the first calculation unit 320 and the function unit 340 respectively; the collecting unit 310 is configured to receive the oil temperature signal and the oil level signal output by the measurement and control cabinet, transmit the oil level signal to the first calculating unit 320, and transmit the oil temperature signal to the function unit 340. The function unit 340 is electrically connected to the first calculation unit 320; the function unit 340 is configured to obtain an oil temperature and oil level function according to a factory oil level curve of the transformer, and bring an oil temperature signal into the oil temperature and oil level function to obtain an actual oil level, and transmit the actual oil level to the first calculation unit 320. The first calculating unit 320 is electrically connected with the second calculating unit 330; the first calculation unit 320 is used to subtract the actual oil level from the oil level signal to obtain an oil level difference and transmit the oil level difference to the second calculation unit 330. The second calculating unit 330 is electrically connected with the comparing unit 350; the second calculation unit 330 is configured to calculate an absolute value of the oil level difference, and to divide the absolute value by the error coefficient to obtain a determination coefficient, which is transmitted to the comparison unit 350. The comparing unit 350 is configured to compare the judgment coefficient with 1, and output an output signal to the background monitor according to the comparison result. Alternatively, when the determination coefficient is larger than 1, it is determined that the oil level signal is abnormal. The comparison unit 350 may output an abnormal state signal as an alarm signal only when the oil level signal is abnormal; and when the oil level signal is normal, the oil level signal is not output, and the background monitor defaults to be normal. The comparison unit 350 may output a normal state signal when the oil level signal is normal, and an abnormal state signal when the oil level signal is abnormal.
The oil level signal is output to the oil level control unit, and the oil level control unit is used for controlling the oil level signal to be in a normal state.
Fig. 7 is a schematic structural diagram of another oil level state determination system for a transformer according to an embodiment of the present invention. As shown in fig. 7, the present embodiment explains the structure and the mounting position of the sensor module 110 in addition to the above embodiments. Optionally, the sensing module 110 includes: an oil level sensing unit 111 and an oil temperature sensing unit 112.
The oil level sensing unit 111 is mounted on the oil conservator 210 of the transformer 200 and used for collecting the actual oil level of the transformer 200; the oil temperature sensing unit 112 is installed inside the tank 220 of the transformer 200, and is used for acquiring the actual oil temperature of the transformer 200. The oil level sensing unit 111 and the oil temperature sensing unit 112 are respectively installed at different positions in the transformer 200, which is advantageous to more accurately acquire the actual oil level and the actual oil temperature of the transformer.
Further, the oil level sensing unit 111 includes a float link 1111 and a position sensor 1112; the floating ball connecting rod 1111 is positioned in the oil conservator 210; the position sensor 1112 is connected to the float link 1111 and is configured to collect a position signal of the float link 1111 representing an actual oil level of the transformer 200. Wherein, the position of the floating ball connecting rod 1111 marks the liquid level position of the transformer oil. The position sensor 1112 collects the position signal of the ball float link 1111 and converts the position signal into a current signal for output.
The oil temperature sensing unit 112 includes a thermal resistor 1121 and a transmitter 1122; the thermal resistor 1121 is located inside the case 220 of the transformer 200; the transmitter 1122 is connected to the thermal resistor 1121 for acquiring a resistance signal of the thermal resistor 1121, which represents the actual oil temperature of the transformer 200. The resistance value of the thermal resistor 1121 changes with the change of the oil temperature, so the resistance signal of the thermal resistor 1121 can be used to represent the actual oil temperature of the transformer 200. The transmitter 1122 collects the resistance signal of the thermal resistor 1121 and converts the resistance signal into a current signal for output.
With continued reference to fig. 7, on the basis of the above embodiments, optionally, the background monitor 140 is further electrically connected to the measurement and control cabinet 120; the background monitor 120 is also used to display the fuel level signal. The monitoring cabinet 120 transmits the analyzed oil level signal to the background monitor 120, and the background monitor 120 may include a display screen for displaying oil level information so as to realize visualization of the oil level information, thereby facilitating the staff to visually obtain the state of the oil level. Meanwhile, the measurement and control cabinet 120 may also transmit the oil temperature information to the background monitor 120 for display, so as to realize comprehensive visualization of the oil temperature and oil level information.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A method for judging the oil level state of a transformer is characterized by comprising the following steps:
obtaining an oil temperature and oil level function according to a factory oil level curve of the transformer;
acquiring the actual oil temperature and the actual oil level of the transformer;
obtaining a standard oil level according to the actual oil temperature and the oil temperature and oil level function;
and comparing the actual oil level with the standard oil level, and if the deviation of the actual oil level exceeds a preset range, determining that the actual oil level is abnormal and generating an alarm signal.
2. The method for determining the oil level state of the transformer according to claim 1, wherein the comparing the actual oil level with the standard oil level and determining that the actual oil level is abnormal if the deviation of the actual oil level exceeds a preset range comprises:
subtracting the standard oil level from the actual oil level to obtain an oil level difference value;
and comparing the absolute value of the oil level difference with an error coefficient, and if the absolute value of the oil level difference is greater than the error coefficient, determining that the actual oil level is abnormal.
3. The method for determining the oil level state of the transformer according to claim 1, wherein the comparing the actual oil level with the standard oil level and determining that the actual oil level is abnormal if the deviation of the actual oil level exceeds a preset range comprises:
subtracting the standard oil level from the actual oil level to obtain an oil level difference value;
dividing the absolute value of the oil level difference value by an error coefficient to obtain a judgment coefficient;
and if the judgment coefficient is larger than 1, judging that the actual oil level is abnormal.
4. The method for determining the oil level status of a transformer according to claim 1, wherein the generating a warning signal comprises: an electronic warning signboard is issued.
5. The method for determining the oil level status of a transformer according to claim 1, further comprising: and displaying the actual oil level by adopting a display screen.
6. The method for determining the oil level status of a transformer according to claim 1, further comprising:
after the transformer operates for a preset time period, adjusting the oil level curve to obtain an adjustment curve;
and adjusting the oil temperature and oil level function according to the adjustment curve to obtain a standard database of the oil temperature and oil level function.
7. A system for determining a state of an oil level in a transformer, comprising:
the sensing module is arranged on the transformer and used for acquiring the actual oil temperature and the actual oil level of the transformer and converting the actual oil temperature and the actual oil level into electric signals to be output;
the measurement and control cabinet is electrically connected with the sensing module and is used for analyzing and outputting an oil temperature signal and an oil level signal according to the electric signal;
a controller electrically connected with the measurement and control cabinet for implementing the method according to any of claims 1-6;
and the background monitor is electrically connected with the controller and used for alarming according to the alarm signal.
8. The system for distinguishing the oil level state of the transformer according to claim 7, wherein the background monitor is further electrically connected with the measurement and control cabinet; the background monitor is also used for displaying the oil level signal.
9. The system for determining the oil level condition of a transformer according to claim 7, wherein said sensing module comprises:
the oil level sensing unit is arranged in an oil conservator of the transformer and is used for collecting the actual oil level of the transformer;
and the oil temperature sensing unit is arranged in the box body of the transformer and used for acquiring the actual oil temperature of the transformer.
10. The system for determining the oil level condition of the transformer as claimed in claim 9, wherein said oil level sensing unit comprises a floating ball link and a position sensor; the floating ball connecting rod is positioned in the oil conservator; the position sensor is connected with the floating ball connecting rod and used for collecting a position signal of the floating ball connecting rod to represent the actual oil level of the transformer;
the oil temperature sensing unit comprises a thermal resistor and a transmitter; the thermal resistor is positioned inside a box body of the transformer; the transmitter is connected with the thermal resistor and used for acquiring a resistance signal of the thermal resistor to represent the actual oil temperature of the transformer.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114812696A (en) * | 2022-06-28 | 2022-07-29 | 成都佳信电气工程技术有限公司 | Main transformer conservator, oil level monitoring system and fault judgment method |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050223782A1 (en) * | 2004-04-07 | 2005-10-13 | Hitachi Industrial Equipment Systems Co., Ltd. | Transformer monitoring system |
| DE102007028704A1 (en) * | 2007-06-21 | 2009-01-02 | Areva Energietechnik Gmbh | Oil filling monitoring method for electrical transformer, involves comparing actual measured oil temperature with determined reference oil level, and outputting warning or alert depending on comparison |
| CN201811805U (en) * | 2010-08-31 | 2011-04-27 | 浙江伦特机电有限公司 | Integrated temperature sensor |
| CN105547418A (en) * | 2015-12-07 | 2016-05-04 | 中国电力科学研究院 | Detection device and detection method for optical fiber oil level sensor performance used for transformer |
| CN106525194A (en) * | 2016-11-21 | 2017-03-22 | 北京殷图网联科技股份有限公司 | Main transformer oil level real-time monitoring method based on ultimate oil temperature equivalence method |
| CN110207784A (en) * | 2019-07-12 | 2019-09-06 | 国家电网有限公司 | Transformer oil level alarm method, device and terminal device |
| CN111561973A (en) * | 2020-06-22 | 2020-08-21 | 杭州电力设备制造有限公司 | Integrated intelligent remote monitoring system for oil temperature and oil level of oil-immersed transformer |
-
2020
- 2020-11-11 CN CN202011253321.4A patent/CN112504397A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050223782A1 (en) * | 2004-04-07 | 2005-10-13 | Hitachi Industrial Equipment Systems Co., Ltd. | Transformer monitoring system |
| DE102007028704A1 (en) * | 2007-06-21 | 2009-01-02 | Areva Energietechnik Gmbh | Oil filling monitoring method for electrical transformer, involves comparing actual measured oil temperature with determined reference oil level, and outputting warning or alert depending on comparison |
| CN201811805U (en) * | 2010-08-31 | 2011-04-27 | 浙江伦特机电有限公司 | Integrated temperature sensor |
| CN105547418A (en) * | 2015-12-07 | 2016-05-04 | 中国电力科学研究院 | Detection device and detection method for optical fiber oil level sensor performance used for transformer |
| CN106525194A (en) * | 2016-11-21 | 2017-03-22 | 北京殷图网联科技股份有限公司 | Main transformer oil level real-time monitoring method based on ultimate oil temperature equivalence method |
| CN110207784A (en) * | 2019-07-12 | 2019-09-06 | 国家电网有限公司 | Transformer oil level alarm method, device and terminal device |
| CN111561973A (en) * | 2020-06-22 | 2020-08-21 | 杭州电力设备制造有限公司 | Integrated intelligent remote monitoring system for oil temperature and oil level of oil-immersed transformer |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114812696A (en) * | 2022-06-28 | 2022-07-29 | 成都佳信电气工程技术有限公司 | Main transformer conservator, oil level monitoring system and fault judgment method |
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