CN113203531A - Method for monitoring sealing degree of transformer bushing - Google Patents
Method for monitoring sealing degree of transformer bushing Download PDFInfo
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- CN113203531A CN113203531A CN202110318957.0A CN202110318957A CN113203531A CN 113203531 A CN113203531 A CN 113203531A CN 202110318957 A CN202110318957 A CN 202110318957A CN 113203531 A CN113203531 A CN 113203531A
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000007789 sealing Methods 0.000 title claims abstract description 22
- 238000012544 monitoring process Methods 0.000 title claims abstract description 21
- 230000008054 signal transmission Effects 0.000 claims abstract description 17
- 238000003745 diagnosis Methods 0.000 claims abstract description 4
- 238000007781 pre-processing Methods 0.000 claims abstract description 4
- 238000004590 computer program Methods 0.000 claims description 9
- 230000005540 biological transmission Effects 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 9
- 238000012545 processing Methods 0.000 description 6
- 230000006870 function Effects 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2807—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes
- G01M3/2815—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes using pressure measurements
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Housings And Mounting Of Transformers (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The invention discloses a transformer bushing sealing degree monitoring method which comprises a signal acquisition module, a signal transmission module and a signal analysis module positioned on an upper computer, wherein the signal acquisition module is used for acquiring a signal; the signal acquisition module comprises a pressure transmitter and a temperature sensor and is used for acquiring temperature and pressure signals of the transformer bushing in real time, the signal transmission module transmits the acquired temperature and pressure signals to the signal analysis module, and the signal analysis module carries out pressure signal preprocessing and sealing degree diagnosis. The method carries out online monitoring and operation judgment on the sealing state of the transformer bushing, and improves the safety and reliability of the power grid.
Description
Technical Field
The invention relates to a method for monitoring the sealing degree of a transformer bushing, and belongs to the technical field of online monitoring of power transformer bushings.
Background
The transformer bushing is a support device for insulating the conductor from the transformer tank, and the stability of the transformer and even the stability of the whole power system are directly affected by the stability of the operation of the transformer bushing. At present, the problem of oil leakage caused by poor sealing of the oil paper capacitive type sleeve is a serious defect of transformer faults, and after the oil paper capacitive type sleeve is lack of oil, a top capacitor is exposed, and air breakdown easily occurs under the long-time running condition because the air breakdown voltage is far lower than that of insulating oil, so that the insulating property of the sleeve is influenced.
The faults are observed on the market mainly through visual observation of the oil level indicator, but because the oil level indicator is located at a higher position, the simple observation is not reliable enough, and the phenomenon of false oil level is easy to occur. Therefore, it is necessary to develop a sealing performance monitoring study of the transformer bushing to ensure safe and stable operation of the transformer system.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a method for monitoring the sealing degree of a transformer bushing, which is used for monitoring and judging the sealing state of the transformer bushing on line and improving the safety and reliability of a power grid.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the invention provides a method for monitoring the sealing degree of a transformer bushing, which is characterized by comprising the following steps: the device comprises a signal acquisition module, a signal transmission module and a signal analysis module positioned on an upper computer;
the signal acquisition module comprises a pressure transmitter and a temperature sensor and is used for acquiring temperature and pressure signals of the transformer bushing in real time;
the signal transmission module transmits the acquired temperature and pressure signals to the signal analysis module;
and the signal analysis module is used for preprocessing the pressure signal and diagnosing the sealing degree.
Furthermore, the pressure transmitter and the temperature sensor are arranged at a sleeve flange and used for collecting the pressure and the temperature of the insulating oil at the oil taking port of the flange.
Further, the signal transmission mode of the signal transmission unit is an RS 232/485 transmission mode, and the signal of the signal acquisition module is transmitted to the signal analysis module in a wired/wireless mode for processing.
Furthermore, the signal transmission module synchronously transmits the collected signals of the pressure transmitter and the temperature sensor.
Further, the signal analysis module comprises the following steps:
calculating the pressure change in unit time t
；
Calculating the theoretical pressure variation corresponding to the actual temperature variation in unit time t
According to formula (I)
Wherein
Represents the temperature change per unit time t;
calculating the reliable coefficient k of the actual pressure intensity change and the theoretical pressure intensity change in unit time t according to the formula
；
And setting diagnosis information according to the k value.
Further, the diagnostic information includes: if 3> k >1.2, an air leakage is diagnosed, and if k >3, an oil leakage fault is diagnosed.
In a second aspect, the present invention provides a computer device/system/module comprising a processor and a storage medium;
the storage medium is used for storing instructions;
the processor is configured to operate according to the instructions to perform the steps of any of the above methods.
In a third aspect, the invention provides a computer-readable storage medium having a computer program stored thereon, wherein the program is adapted to carry out the steps of any of the methods described above when executed by a processor.
Compared with the prior art, the invention has the following beneficial effects: by the transformer bushing sealing degree monitoring method, the on-line monitoring of the sealing state of the transformer bushing is realized in the process of not influencing the operation of actual equipment, so that the working efficiency and the safety of the equipment are ensured.
Drawings
Fig. 1 is a schematic diagram of an arrangement structure of a signal acquisition module and a signal transmission module in a transformer bushing according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a method for monitoring the sealing degree of a transformer bushing according to an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The transformer bushing sealing degree monitoring method adopts the following technical scheme: the method comprises the following steps: the device comprises a signal acquisition module, a signal transmission module and a signal analysis module.
The signal acquisition module comprises a pressure transmitter and a temperature sensor, the pressure transmitter and the temperature sensor are arranged at the flange of the transformer bushing, and can acquire the pressure and the temperature of the insulating oil at the oil taking port of the flange and is used for acquiring the temperature and the pressure signals of the transformer bushing in real time.
The signal transmission module is used for synchronously transmitting signals collected by the pressure sensor and the temperature sensor, the signal transmission module transmits the collected temperature signals and pressure signals to the signal analysis module in the upper computer, and the signal transmission mode of the signal transmission module is RS 232/485 transmission mode, so that the sensor signals can be transmitted to the upper computer in a wired or wireless mode for processing. The signal analysis module is mainly arranged at an upper computer end and comprises pressure signal preprocessing operation and sealing degree diagnosis operation.
As shown in fig. 2, which is a schematic flow chart of a transformer bushing sealing degree monitoring method according to an embodiment of the present invention, wherein a signal analysis module specifically includes the following steps:
step S1, calculating the pressure change in unit time t
；
Step S2, based onFormula (II)
Wherein
Representing the temperature change per unit time t,
representing theoretical pressure variation corresponding to actual temperature variation in unit time t;
step S3, according to the formula
Calculating a reliability coefficient k of actual pressure variation and theoretical pressure variation within time t;
step S4, if 3> k >1.2, diagnosing air leakage, if k >3, diagnosing oil leakage fault;
as shown in fig. 1, the transformer bushing hardware device provided with reference to fig. 1 is arranged with temperature and pressure sensors at the bushing flange, and further converts the obtained signal into a WIFI signal through an RS-485 communication protocol for communication transmission with an upper computer.
After a signal analysis module in the upper computer acquires a signal, a theoretical pressure value corresponding to the temperature is calculated, unit time is selected according to actual conditions, for example, 24 hours is used as the pressure unit time, a pressure difference value and a theoretical pressure difference value of two time points separated by 24 hours are calculated, a ratio k value of the actual pressure difference to the theoretical pressure difference is further calculated, and finally the k value is compared with 1.2 and 3 to diagnose the sealing degree of the casing. If 3> k >1.2, an air leakage is diagnosed, and if k >3, an oil leakage fault is diagnosed.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (8)
1. A transformer bushing tightness monitoring method is characterized by comprising the following steps: the device comprises a signal acquisition module, a signal transmission module and a signal analysis module positioned on an upper computer;
the signal acquisition module comprises a pressure transmitter and a temperature sensor and is used for acquiring temperature and pressure signals of the transformer bushing in real time;
the signal transmission module transmits the acquired temperature and pressure signals to the signal analysis module;
and the signal analysis module is used for preprocessing the pressure signal and diagnosing the sealing degree.
2. The method for monitoring the sealing degree of the transformer bushing according to claim 1, wherein the pressure transmitter and the temperature sensor are arranged at a bushing flange, and the pressure and the temperature of the insulating oil at an oil taking port of the flange are collected.
3. The transformer bushing tightness monitoring method according to claim 1, wherein the signal transmission unit transmits the signal of the signal acquisition module to the signal analysis module in a wired/wireless manner in a RS 232/485 transmission manner.
4. The method for monitoring the sealing degree of the transformer bushing as claimed in claim 1, wherein the signal transmission module synchronously transmits the collected signals of the pressure transmitter and the temperature sensor.
5. The transformer bushing tightness monitoring method according to claim 1, wherein the signal analysis module comprises the following steps:
calculating the pressure change in unit time t
；
Calculating the theoretical pressure variation corresponding to the actual temperature variation in unit time t
According to formula (I)
Wherein
Represents the temperature change per unit time t;
calculating the reliable coefficient k of the actual pressure intensity change and the theoretical pressure intensity change in unit time t according to the formula
；
And setting diagnosis information according to the k value.
6. The transformer bushing tightness monitoring method according to claim 1, wherein the diagnostic information comprises: if 3> k >1.2, an air leakage is diagnosed, and if k >3, an oil leakage fault is diagnosed.
7. A computer device/system/module comprising a processor and a storage medium;
the storage medium is used for storing instructions;
the processor is configured to operate in accordance with the instructions to perform the steps of the method according to any one of claims 1 to 6.
8. Computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110318957.0A CN113203531A (en) | 2021-03-25 | 2021-03-25 | Method for monitoring sealing degree of transformer bushing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110318957.0A CN113203531A (en) | 2021-03-25 | 2021-03-25 | Method for monitoring sealing degree of transformer bushing |
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| CN113203531A true CN113203531A (en) | 2021-08-03 |
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| CN202110318957.0A Pending CN113203531A (en) | 2021-03-25 | 2021-03-25 | Method for monitoring sealing degree of transformer bushing |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113804371A (en) * | 2021-11-17 | 2021-12-17 | 南京博路电气有限公司 | Distribution transformer monitoring method and terminal |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1152122A (en) * | 1995-07-20 | 1997-06-18 | 丰田自动车株式会社 | Method of testing pressure relief |
| JP2007327849A (en) * | 2006-06-07 | 2007-12-20 | Nakk:Kk | Leak inspection method and leak inspection system |
| CN112326153A (en) * | 2020-09-23 | 2021-02-05 | 国网江苏省电力有限公司电力科学研究院 | Transformer bushing sealing degree monitoring device and method thereof |
-
2021
- 2021-03-25 CN CN202110318957.0A patent/CN113203531A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1152122A (en) * | 1995-07-20 | 1997-06-18 | 丰田自动车株式会社 | Method of testing pressure relief |
| JP2007327849A (en) * | 2006-06-07 | 2007-12-20 | Nakk:Kk | Leak inspection method and leak inspection system |
| CN112326153A (en) * | 2020-09-23 | 2021-02-05 | 国网江苏省电力有限公司电力科学研究院 | Transformer bushing sealing degree monitoring device and method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113804371A (en) * | 2021-11-17 | 2021-12-17 | 南京博路电气有限公司 | Distribution transformer monitoring method and terminal |
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