CN114295176A - Oil level measuring and calculating method and device for oil conservator - Google Patents
Oil level measuring and calculating method and device for oil conservator Download PDFInfo
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Abstract
The invention relates to the technical field of transformers, in particular to a method and a device for measuring and calculating an oil level of an oil conservator. The measuring and calculating method comprises the following steps: firstly, acquiring the temperature and the oil pressure of transformer oil through a sensor; then, correcting the temperature according to the environment temperature and a correction coefficient to obtain a corrected temperature, wherein the correction coefficient is determined according to the installation position of the temperature sensor; then determining the density of the transformer oil according to the corrected temperature; and finally, determining the oil level of the transformer oil according to the oil pressure and the density of the transformer oil. The temperature is corrected by determining the correction coefficient according to the installation position of the temperature sensor, so that the corrected temperature can accurately reflect the temperature of transformer oil in the oil conservator, the oil level obtained by calculating the corrected temperature is an actual oil level, and the accurate monitoring of the oil level of the oil conservator is realized.
Description
Technical Field
The invention relates to the technical field of transformers, in particular to a method and a device for measuring and calculating an oil level of an oil conservator.
Background
The large power transformer in operation is mainly an oil immersed transformer, and the transformer oil plays roles of insulation and cooling in the operation process of the transformer. If the oil level of the transformer is too high, the pressure in the oil tank is possibly too high at high temperature or under heavy load, so that oil spilling or pressure release valve action is caused; if the oil level of the transformer is too low, the high-voltage part is exposed due to oil loss protection, and breakdown, discharge or transformer damage is caused; in addition, the oil level of the transformer can reflect the sealing condition of the oil tank, so that oil leakage or oil leakage can be found conveniently in time. Therefore, it is very important to accurately monitor the oil level of the transformer in time for safe operation of the transformer.
The transformer oil level gauge is a device for indicating the height of the oil level in the oil conservator, along with the development of sensor technology and the development requirement of a smart grid, the digital transformer oil level gauge for measuring the oil level of the oil conservator by collecting the oil pressure and the oil temperature is produced, the sensor is installed at any position of the oil conservator or an oil tank, the oil level of the oil conservator is calculated by combining the collected oil temperature and the collected oil pressure, and then the oil level is converted into an indication value of the transformer oil level gauge. The oil level measuring and calculating method of the existing digital transformer oil level indicator mostly does not consider temperature compensation, so that a large error exists between the measured oil level and the actual oil level, the oil level of an oil conservator cannot be accurately monitored, and potential safety hazards are caused to the operation of a transformer.
Disclosure of Invention
The invention provides an oil level measuring and calculating method for an oil storage cabinet, which is used for solving the technical problem that the oil level of the oil storage cabinet cannot be accurately monitored because temperature compensation is not considered in the oil level measuring and calculating method for the oil storage cabinet in the prior art.
The invention provides an oil level measuring and calculating method for an oil conservator, which comprises the following steps:
acquiring the temperature and the oil pressure of transformer oil;
correcting the temperature according to the environment temperature and a correction coefficient to obtain a corrected temperature, wherein the correction coefficient is determined according to the installation position of the temperature sensor;
determining the density of the transformer oil according to the corrected temperature;
and determining the oil level of the transformer oil according to the oil pressure and the density.
In a first possible implementation of the method of the first aspect, the correction factor is proportional to a distance of the temperature sensor relative to the conservator.
In a second possible implementation of the method of the first aspect, the corrected temperature T1 ═ T0-k (T0-T2), wherein: the T0 is the temperature of the transformer oil, the T2 is the ambient temperature, and k is the correction coefficient;
if the temperature sensor is installed in the conservator, k is 0.
In a third possible implementation method of the first aspect, after determining the oil level of the transformer oil according to the oil pressure and the density, the method further includes:
calculating the height per unit value of the oil level in the oil conservator;
calculating the rotation angle of the oil level gauge according to the height per unit value;
an indication value of the oil level gauge is calculated based on the rotation angle.
In a fourth possible implementation method of the first aspect, after determining the oil level of the transformer oil according to the oil pressure and the density, the method further includes:
calculating the oil quantity proportion of the oil conservator according to the oil level;
and calculating the oil quantity of the oil conservator according to the oil quantity proportion.
In a fifth possible implementation method of the first aspect, after determining the oil level of the transformer oil according to the oil pressure and the density, the method further includes:
calculating the pressure of the corrugated expander on the transformer oil;
and correcting the oil level according to the pressure intensity, the density and the oil pressure to obtain a corrected oil level, wherein the oil pressure is the oil pressure at the bottom of the internal oil vertical type corrugated oil conservator.
In combination with the fifth possible implementation method of the first aspect, in a sixth possible implementation method, the correction oil level H1 is (PS + KH0+ ρ gSH2)/(ρ gS + K), where: p is the oil pressure, S is the top cover area of the bellows expander, K is the elastic coefficient of the bellows expander, H0 is the height of the bellows expander in the free state, H2 is the height of the pressure sensor relative to the bottom of the conservator, ρ is the density, and g is the acceleration of gravity.
With reference to the fifth possible implementation method of the first aspect, in a seventh possible implementation method, after the correcting the oil level according to the pressure, the density, and the oil pressure, the method further includes:
comparing the correction oil level with a low oil level threshold and a high oil level threshold, respectively;
and if the correction oil level is smaller than the low oil level threshold value or larger than the high oil level threshold value, sending an alarm signal.
The invention provides an oil level measuring and calculating device for an oil conservator, which comprises: the device comprises a pressure sensor, a temperature sensor, a conversion module and a data processing module;
the pressure sensor is used for acquiring the oil pressure of the transformer oil;
the temperature sensor is used for acquiring the temperature of the transformer oil and the ambient temperature;
the conversion module is used for converting the current signal or the voltage signal of the sensor into digital quantity and outputting the digital quantity to the data processing module;
the data processing module is used for processing the digital quantity and outputting an oil level;
the pressure sensor and the temperature sensor are connected with the data processing module through the conversion module.
In a first possible implementation of the second aspect, the apparatus further includes: the communication module, the storage module and the human-computer interaction module are connected with the data processing module;
the communication module is used for information interaction with the communication manager;
the storage module is used for storing the oil pressure and the temperature;
the man-machine interaction module is used for inputting instructions.
According to the technical scheme, the invention has the following advantages:
the oil level measuring and calculating method of the oil conservator, provided by the invention, comprises the steps of firstly obtaining the temperature and the oil pressure of transformer oil through a sensor; then, correcting the temperature according to the environment temperature and a correction coefficient to obtain a corrected temperature, wherein the correction coefficient is determined according to the installation position of the temperature sensor; then determining the density of the transformer oil according to the corrected temperature; and finally, determining the oil level of the transformer oil according to the oil pressure and the density of the transformer oil. The temperature is corrected by determining the correction coefficient according to the installation position of the temperature sensor, so that the corrected temperature can accurately reflect the temperature of transformer oil in the oil conservator, the oil level obtained by calculating the corrected temperature is an actual oil level, and the accurate monitoring of the oil level of the oil conservator is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic flow chart of a method for measuring and calculating an oil level of an oil conservator according to an embodiment of the present disclosure;
FIG. 2 is another schematic flow chart of a method for measuring oil level in an oil conservator according to an embodiment of the present disclosure;
FIG. 3 is another schematic flow chart of a method for measuring oil level in an oil conservator according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of an oil level measuring and calculating device for an oil conservator according to an embodiment of the present application.
Detailed Description
The embodiment of the invention provides an oil level measuring and calculating method for an oil conservator, which is used for solving the technical problem that the oil level of the oil conservator cannot be accurately monitored because temperature compensation is not considered in the oil level measuring and calculating method for the oil conservator in the prior art.
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
The oil conservator is commonly called as an oil conservator and is arranged above the transformer oil tank and connected with the transformer oil tank through a pipeline, when the transformer oil expands due to heat, the transformer oil flows to the oil conservator from the transformer oil tank, when the transformer oil contracts due to cold, the transformer oil flows to the oil tank from the oil conservator, and the oil conservator is equivalent to a buffer and has the function of ensuring that the transformer oil tank is filled with the transformer oil all the time. Because the oil in the oil tank is always in a full state, the oil level of the transformer is represented by the oil level of the oil conservator. The digital transformer oil level indicator is a device for calculating the oil level of an oil conservator by acquiring the temperature and the oil pressure of transformer oil through a temperature sensor and a pressure sensor, but the transformer oil at different positions has different temperatures, for example, the temperature of the transformer oil at the three positions of a pipeline, an oil tank and the oil conservator has larger difference, and the calculated oil level of the oil conservator needs to be ensured to be the actual oil level of the oil conservator, so that the temperature of the transformer oil used for calculation needs to be the temperature of the transformer oil in the oil conservator. However, the oil level of the oil storage cabinet is calculated by the oil level gauge of the existing digital transformer at any position according to the temperature of the transformer oil, so that a large error may exist between the measured oil level and the actual oil level, the oil level of the oil storage cabinet cannot be accurately monitored, and certain potential safety hazard is caused to the operation of the transformer.
Example one
Referring to fig. 1, fig. 1 is a schematic flow chart of a method for measuring and calculating an oil level of an oil conservator according to an embodiment of the present invention.
The oil level measuring and calculating method for the oil conservator, provided by the embodiment, comprises the following steps:
101. acquiring the temperature and the oil pressure of transformer oil;
in the embodiment, a temperature sensor is arranged at any position of the transformer covered by the transformer oil to acquire the temperature of the transformer oil; because the oil level of the oil conservator needs to be calculated through a pressure formula of liquid, the collected pressure needs to be ensured to correspond to the actual oil level of the oil conservator, and a pressure sensor is arranged at the bottom of the oil conservator to collect the oil pressure of the transformer oil.
102. Correcting the temperature according to the environment temperature and a correction coefficient to obtain a corrected temperature, wherein the correction coefficient is determined according to the installation position of the temperature sensor;
the heat can be transmitted to the place with low temperature from the place with high temperature, because the transformer oil can be in direct contact with the transformer oil tank, the pipeline and the oil conservator, and the transformer oil tank, the pipeline and the oil conservator are in contact with the external environment, so the temperature of the transformer oil is influenced by the temperature of the transformer oil tank, the pipeline, the oil conservator and the external environment at the same time, and the environment temperature can refer to the temperature of the transformer oil tank, the temperature of the pipeline, the temperature of the oil conservator, the temperature of the external environment or the average value of the four temperatures. It can be seen that the temperature of the transformer oil is a dynamically changing quantity during the flow process. In this embodiment, since the temperature of the external environment has the greatest influence on the temperature of the transformer oil, the external environment temperature is used as the environment temperature; the correction coefficient is an empirical value, and can be understood as a difference degree, namely the difference degree between the temperature of the transformer oil at any position of the transformer and the temperature of the transformer oil of the oil conservator; and correcting the temperature, namely calculating the temperature of the transformer oil in the oil conservator by combining the temperature of the transformer oil collected by the temperature sensor with the correction coefficient and the ambient temperature.
103. Determining the density of the transformer oil according to the corrected temperature;
in this embodiment, the density of the transformer oil in the conservator can be calculated because the density of the transformer oil at 0 ℃ and the coefficient of thermal expansion of the transformer oil are known, and further, the temperature-corrected temperature of the transformer oil in the conservator has been determined in accordance with step 102.
104. Determining the oil level of the transformer oil according to the oil pressure and the density;
in this embodiment, the oil pressure at the bottom of the conservator and the density of the transformer oil in the conservator are known, and the depth-oil level of the transformer oil corresponding to the oil pressure can be calculated according to the pressure formula of the liquid.
The beneficial effects of this embodiment: according to the oil level measuring and calculating method of the oil conservator, the temperature and the oil pressure of transformer oil are obtained through a sensor; then, correcting the temperature according to the environment temperature and a correction coefficient to obtain a corrected temperature, wherein the correction coefficient is determined according to the installation position of the temperature sensor; then determining the density of the transformer oil according to the corrected temperature; and finally, determining the oil level of the transformer oil according to the oil pressure and the density of the transformer oil. The temperature is corrected by determining the correction coefficient according to the installation position of the temperature sensor, so that the corrected temperature can accurately reflect the temperature of transformer oil in the oil conservator, the oil level obtained by calculating the corrected temperature is an actual oil level, and the accurate monitoring of the oil level of the oil conservator is realized.
Example two
In order to meet the use habit of operation and maintenance personnel, the oil level of the oil conservator measured by the digital oil level gauge of the transformer needs to be presented by a pointer type oil level gauge, and meanwhile, the oil quantity proportion and the oil quantity of the oil conservator need to be calculated, so that the operation condition of the transformer can be better monitored by the operation personnel. In the present embodiment, the digital transformer oil level gauge and the pointer oil level gauge are fitted, and the conservator oil quantity ratio and the oil quantity are calculated.
Referring to fig. 2, fig. 2 is another schematic flow chart of a method for measuring an oil level of an oil conservator according to an embodiment of the present invention.
The oil level measuring and calculating method for the oil conservator, provided by the embodiment, comprises the following steps:
201. acquiring the temperature and the oil pressure of transformer oil;
in this embodiment, the specific content of step 201 is similar to that of step 101 in the first embodiment, and is not described herein again.
202. Correcting the temperature according to the environment temperature and the correction coefficient to obtain a corrected temperature;
the further the temperature sensor is from the conservator, the greater the difference between the temperature of the transformer oil it collects and the temperature of the transformer oil in the conservator, since the greater the distance, representing the distance and time taken by the transformer oil to travel from this location to the conservator, the more heat that results in heat flowing from the transformer oil to the transformer oil or from the environment to the transformer oil, and so the correction factor is proportional to the distance of the temperature sensor from the conservator, which should be understood as: the path length of the transformer oil flowing from the position of the temperature sensor to the oil conservator. Such as: the correction coefficient corresponding to the oil tank is larger than that corresponding to the pipeline. In the present embodiment, the corrected temperature T1 ═ T0-k (T0-T2), where: t0 is the temperature of the transformer oil collected by the temperature sensor, T2 is the ambient temperature, i.e., the external ambient temperature, and k is the correction factor. It should be noted that if the temperature sensor is installed in the conservator, T1 is T0, i.e., the correction coefficient k is 0.
203. Determining the density of the transformer oil according to the corrected temperature;
in this embodiment, the density ρ of the transformer oil in the conservator is ρ 0/(1+ α T1), where: rho 0 is the density of the transformer oil at 0 ℃, alpha is the thermal expansion coefficient of the transformer oil, and T1 is the corrected temperature.
204. Determining the oil level of the transformer oil according to the oil pressure and the density;
since the liquid pressure is liquid density is weight acceleration is liquid depth, in this example, the transformer oil level H of the conservator is P/ρ g + H2, where P is the pressure sensed by the pressure sensor, ρ is the density of the transformer oil in the conservator, g is weight acceleration, and H2 is the height of the pressure sensor relative to the conservator bottom, and since in this example the pressure sensor is mounted at the conservator bottom, H2 is 0.
205. Calculating the height per unit value of the oil level in the oil conservator;
a per unit value is one of relative units. The unit value is a numerical value marking method commonly used in power system analysis and engineering calculation, and represents a relative value of each physical quantity and parameter, and the unit is pu, which can also be regarded as dimensionless. In this embodiment, the conservator is a cylindrical container, and is placed above the transformer oil tank, and the height per unit of the oil level in the conservator is H/D, wherein: h is the transformer oil level of the oil conservator, and D is the inner diameter of the oil conservator.
206. Calculating an indicated value of the oil level gauge according to the height per unit value;
in this embodiment, the rotation angle θ of the float link of the pointer-type oil level gauge is calculated from the height per unit value, θ ═ arcsin (h.sin (θ max)), where: theta max is the maximum rotation angle of a floating ball connecting rod of the pointer type oil level indicator, and h is the height per unit value of the oil level in the oil storage cabinet; and then calculating an indication value a of the pointer type oil level indicator according to the rotation angle, wherein a is theta A/theta max, wherein A is the maximum measuring range of the pointer type oil level indicator, according to the industrial standard of the oil level indicator, the maximum rotation angle of a floating ball connecting rod of the domestic oil level indicator is 45 degrees, and the maximum rotation angle of the floating ball connecting rod of the foreign oil level indicator is 60 degrees.
207. Calculating the oil quantity proportion of the oil conservator according to the oil level;
in this embodiment, the inner diameter of the conservator is D, the inner radius is D, and the oil quantity ratio s of the conservator is equal to the ratio of the area of the transformer oil on the vertical cross section of the conservator to the area of the vertical cross section of the conservator, so when the transformer oil level H of the conservator is less than D, the oil quantity ratio s of the conservator is calculated as follows:
when the oil level H of the transformer oil of the oil conservator is larger than d, the method for calculating the oil quantity ratio s of the oil conservator is as follows:
208. calculating the oil quantity of the oil conservator according to the oil quantity proportion;
in the oil mass and oil storage cabinetThe volume of transformer oil, in this embodiment, the volume of conservator V ═ pi d2L, where d is the inner radius of the conservator, L is the length of the conservator, and the oil quantity of the conservator can be obtained by multiplying the oil quantity proportion of the conservator by the volume of the conservator, namely the oil quantity of the conservator V1-sV-sPi d2L, wherein s is the oil mass proportion of the oil conservator.
The beneficial effects of this embodiment: the oil level measured and calculated by the embodiment is converted into the indicated value of the pointer type oil level indicator, the oil quantity proportion and the oil quantity in the oil storage cabinet are measured and calculated at the same time, the habit of operation and maintenance personnel is met, a plurality of monitoring data are provided, and the oil level of the transformer can be monitored more accurately.
EXAMPLE III
Because the bellows expander of the internal oil vertical type bellows oil conservator can generate a certain acting force on the transformer oil, the pressure intensity collected by the pressure sensor arranged at the bottom of the internal oil vertical type bellows oil conservator comprises the pressure intensity of the transformer oil, and a part of the pressure intensity is applied to the transformer oil by the bellows expander, so if the internal oil vertical type bellows oil conservator is used, the measured and calculated oil level needs to be corrected, and in the embodiment, the correction process of the oil level is expanded and explained.
Referring to fig. 3, fig. 3 is another schematic flow chart of a method for measuring an oil level of an oil conservator according to an embodiment of the present invention.
The oil level measuring and calculating method for the oil conservator, provided by the embodiment, comprises the following steps:
301. acquiring the temperature and the oil pressure of transformer oil;
in this embodiment, the specific content of step 301 is similar to that of step 101 in the first embodiment, and is not described herein again.
302. Correcting the temperature according to the environment temperature and the correction coefficient to obtain a corrected temperature;
in this embodiment, the specific content of step 302 is similar to that of step 202 in the second embodiment, and is not described herein again.
303. Determining the density of the transformer oil according to the corrected temperature;
in this embodiment, the specific content of step 303 is similar to that of step 203 in the second embodiment, and is not described herein again.
304. Determining the oil level of the transformer oil according to the oil pressure and the density;
in this embodiment, the specific content of step 304 is similar to that of step 204 in the second embodiment, and is not described herein again.
305. Calculating the pressure of the ripple expander on the transformer oil;
in the vertical ripple oil conservator with internal oil, the elastic force generated by the elastic deformation of the top cover of the ripple expander and the ripple expander can directly act on the transformer oil, when the ripple expander is in a stretching state, the top cover of the ripple sensor is subjected to downward elastic force, and the part of the elastic force directly acts on the transformer oil through the top cover, so that a downward acting force is applied to the transformer oil, and the pressure sensor at the bottom of the oil conservator collects the downward acting force; when the ripple expander is in a compressed state, the top cover of the ripple sensor is subjected to upward elastic force, and because the interior of the ripple expander is in a vacuum state, the upward elastic force can enable the top of the ripple expander to generate certain negative pressure, namely an upward acting force is applied to the transformer oil, so that the pressure sensor at the bottom of the oil conservator only collects partial self pressure of the transformer oil. Therefore, for the vertical ripple oil conservator with internal oil, if the pressure intensity collected by the pressure sensor is directly used for calculating the oil level of the oil conservator with internal oil, because a part of the pressure intensity is not generated by the transformer oil, the calculated oil level will be larger or smaller, and in order to obtain the pressure intensity of the transformer oil, in the embodiment, the pressure intensity of the ripple expander on the transformer oil needs to be calculated first. The total pressure F generated downwards is calculated to be K (H1-H0) according to the deformation quantity of the bellow expander, wherein K is the elastic coefficient of the bellow expander, H0 is the height of the bellow expander in a free state, and H1 is the actual oil level of the transformer oil of the oil conservator. Since the area of the transformer oil for receiving the downward pressure of the bellows expander is approximately equal to the area of the top cover of the bellows expander, the pressure P1 given to the transformer oil by the bellows expander is F/S K (H1-H0)/S, where S is the area of the top cover of the bellows expander.
306. Correcting the oil level according to the pressure intensity, the density and the oil pressure to obtain a corrected oil level;
in this embodiment, the oil pressure is the oil pressure collected by the pressure sensor at the bottom of the internal vertical corrugated oil conservator, the oil level is corrected to ensure that the measured oil level is infinitely close to the actual oil level of the oil conservator, and the corrected oil level is the oil level at which possible errors are eliminated, so the corrected oil level can be understood as the actual oil level of the internal vertical corrugated oil conservator, and as can be seen from step 305, the pressure P collected by the pressure sensor P-1 + P2-K (H1-H0)/S + ρ g (H1-H2) and the corrected oil level H1 is estimated as (PS + KH0+ gSH2)/(ρ S + K), where: p is the oil pressure collected by the oil pressure sensor, P1 is the pressure given to the transformer oil by the corrugated expander, P2 is the pressure of the transformer oil in the oil conservator, S is the top cover area of the corrugated expander, K is the elastic coefficient of the corrugated expander, H0 is the height of the corrugated expander in the free state, H2 is the height of the pressure sensor relative to the bottom of the oil conservator, in this embodiment, because the pressure sensor is installed at the bottom of the oil conservator, H2 is 0, ρ is the density of the transformer oil in the oil conservator, and g is the acceleration of gravity.
307. Comparing the correction oil level to a low oil level threshold and a high oil level threshold, respectively;
in the embodiment, the correction oil level is respectively compared with the low oil level threshold value and the high oil level threshold value, if the correction oil level is smaller than the low oil level threshold value, an alarm signal is sent out, or if the correction oil level is larger than the high oil level threshold value, an alarm signal is also sent out, operation and maintenance personnel can be reminded to timely react to the transformer fault, and loss is reduced.
The beneficial effects of this embodiment: the embodiment aims at the vertical ripple oil conservator with the internal oil, not only considers the measuring and calculating influence of the temperature of the transformer oil on the oil level of the oil conservator, but also considers the extra pressure of the ripple expander on the generation of the transformer oil, further eliminates the oil level error, and ensures the accurate monitoring of the oil level of the oil conservator.
Example four
Referring to fig. 4, fig. 4 is a schematic structural diagram of an oil level measuring device for an oil conservator according to an embodiment of the present invention.
The oil level measuring and calculating device for the oil conservator comprises:
the device comprises a pressure sensor, a temperature sensor, a conversion module and a data processing module; the pressure sensor is used for acquiring the oil pressure of the transformer oil, converting the oil pressure of the transformer oil into a direct current or voltage signal and outputting the direct current or voltage signal to the conversion module; the temperature sensor is used for acquiring the temperature of the transformer oil and the ambient temperature and outputting the acquired temperature to the conversion module; the conversion module is used for converting the current signal or the voltage signal of the sensor into digital quantity and outputting the digital quantity to the data processing module; the data processing module is used for processing the digital quantity and outputting an oil level; the pressure sensor and the temperature sensor are connected with the data processing module through the conversion module. In this embodiment, the conversion module is an a/D conversion module, the data processing module is a microprocessor, and the acquisition and storage of oil pressure and temperature data and man-machine interaction are required to be completed in addition to processing digital quantity.
Specifically, the oil conservator oil level measuring and calculating device in the embodiment is further provided with: the device comprises a power supply module, a man-machine interaction module, a communication module, a storage module, an output driving module and a clock; the power supply module is respectively connected with modules such as a temperature sensor, a pressure sensor, a clock, a data processing module and the like so as to convert alternating current 220V or direct current 220V and direct current 110V into direct current voltage for the modules such as the temperature sensor, the pressure sensor, the clock, the data processing module and the like; the man-machine interaction module inputs instructions through a keyboard, buttons or a touch screen, displays related information through a nixie tube, a liquid crystal display or an LED screen, and performs parameter setting, state and data browsing and the like; the communication module performs information interaction with the communication manager in a serial port, 485 bus, Bluetooth, WIFI and other modes and is used for receiving commands, modifying parameter setting, outputting historical sampling data, state and alarm information and the like; the storage module is a large-capacity storage and is used for storing data such as events, oil pressure, transformer oil temperature and the like; the output driving module outputs independent nodes through a photoelectric isolation or a small relay, can send action and alarm signals, and displays numerical values such as oil level, temperature and the like through an LED or a liquid crystal screen; the clock provides time for the data processing module to mark the time of the historical data, so that the data analysis and utilization are facilitated. The input end of the data processing module is respectively connected with the conversion module and the clock, and the output end of the data processing module is respectively connected with the human-computer interaction module, the communication module, the storage module and the output driving module.
The beneficial effects of this embodiment: the oil cabinet oil level measuring and calculating device provided by the embodiment can simultaneously realize the functions of an oil temperature meter, an oil level gauge and an oil pressure quick-acting relay, can assist in judging whether a breather is blocked or not and whether an internal oil vertical corrugated oil storage cabinet is blocked or not through the oil level, and can judge whether the oil level is abnormal or not through checking the temperature curve and the oil level curve of transformer oil, so that the total device cost and the operation and maintenance workload are reduced.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the system, the apparatus and the module described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the modules is only one logical division, and other divisions may be realized in practice, for example, a plurality of modules may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or modules, and may be in an electrical, mechanical or other form.
The modules described as separate parts may or may not be physically separate, and parts displayed as modules may or may not be physical modules, may be located in one place, or may be distributed on a plurality of network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
In addition, functional modules in the embodiments of the present invention may be integrated into one processing module, or each of the modules may exist alone physically, or two or more modules are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode.
The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for measuring and calculating oil level of an oil conservator is characterized by comprising the following steps:
acquiring the temperature and the oil pressure of transformer oil;
correcting the temperature according to the environment temperature and a correction coefficient to obtain a corrected temperature, wherein the correction coefficient is determined according to the installation position of the temperature sensor;
determining the density of the transformer oil according to the corrected temperature;
and determining the oil level of the transformer oil according to the oil pressure and the density.
2. The method for measuring and calculating the oil level of the oil conservator according to claim 1, wherein:
the correction factor is proportional to the distance of the temperature sensor relative to the conservator.
3. The method for measuring and calculating the oil level of the oil conservator according to claim 1, wherein:
the corrected temperature T1 ═ T0-k (T0-T2), wherein: the T0 is the temperature of the transformer oil, the T2 is the ambient temperature, and the k is the correction coefficient;
if the temperature sensor is installed in an oil conservator, k is 0.
4. The method for measuring oil level of an oil conservator according to claim 1, wherein after determining oil level of transformer oil according to oil pressure and density, further comprising:
calculating the height per unit value of the oil level in the oil conservator;
calculating a rotation angle of the oil level gauge according to the height per unit value;
an indication value of the oil level gauge is calculated based on the rotation angle.
5. The method for measuring oil level of an oil conservator according to claim 1, wherein after determining oil level of transformer oil according to oil pressure and density, further comprising:
calculating the oil quantity proportion of the oil conservator according to the oil level;
and calculating the oil quantity of the oil conservator according to the oil quantity proportion.
6. The method for measuring oil level of an oil conservator according to claim 1, wherein after determining oil level of transformer oil according to oil pressure and density, further comprising:
calculating the pressure of the ripple expander on the transformer oil;
and correcting the oil level according to the pressure intensity, the density and the oil pressure to obtain a corrected oil level, wherein the oil pressure is the oil pressure at the bottom of the internal oil vertical type corrugated oil conservator.
7. The method for measuring oil level of an oil conservator according to claim 6, wherein:
the correction oil level H1 ═ PS + KH0+ ρ gSH2)/(ρ gS + K), where: the oil pressure is P, the top cover area of the corrugated expansion device is S, the elastic coefficient of the corrugated expansion device is K, the height of the corrugated expansion device in a free state is H0, the height of the pressure sensor relative to the bottom of the oil conservator is H2, the rho is the density, and the g is the gravity acceleration.
8. The method for estimating the oil level of the oil conservator according to claim 6, wherein after correcting said oil level according to said pressure, said density and said oil pressure, further comprising:
comparing the correction oil level to a low oil level threshold and a high oil level threshold, respectively;
and if the correction oil level is smaller than the low oil level threshold value or larger than the high oil level threshold value, sending an alarm signal.
9. An oil conservator oil level measuring device, characterized by, includes:
the device comprises a pressure sensor, a temperature sensor, a conversion module and a data processing module;
the pressure sensor is used for acquiring the oil pressure of the transformer oil;
the temperature sensor is used for acquiring the temperature of the transformer oil and the ambient temperature;
the conversion module is used for converting the current signal or the voltage signal of the sensor into digital quantity and outputting the digital quantity to the data processing module;
the data processing module is used for processing the digital quantity and outputting an oil level;
the pressure sensor and the temperature sensor are connected with the data processing module through the conversion module.
10. The conservator oil level gauging device according to claim 9, further comprising: the communication module, the storage module and the human-computer interaction module are connected with the data processing module;
the communication module is used for information interaction with the communication manager;
the storage module is used for storing the oil pressure and the temperature;
the man-machine interaction module is used for inputting instructions.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115077667A (en) * | 2022-07-27 | 2022-09-20 | 广东电网有限责任公司佛山供电局 | Transformer oil level analysis method and system for eliminating influence of breather |
| 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 |
| CN116168925A (en) * | 2022-12-08 | 2023-05-26 | 南通世睿电力科技有限公司 | Intelligent monitoring method and system for high-voltage transformer oil storage cabinet |
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2022
- 2022-01-04 CN CN202210005770.XA patent/CN114295176A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| CN115077667A (en) * | 2022-07-27 | 2022-09-20 | 广东电网有限责任公司佛山供电局 | Transformer oil level analysis method and system for eliminating influence of breather |
| CN116168925A (en) * | 2022-12-08 | 2023-05-26 | 南通世睿电力科技有限公司 | Intelligent monitoring method and system for high-voltage transformer oil storage cabinet |
| CN116168925B (en) * | 2022-12-08 | 2023-12-01 | 南通世睿电力科技有限公司 | Intelligent monitoring method and system for high-voltage transformer oil storage cabinet |
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