CN109725220B - Detection method, system and device for transformer oil cooling loop - Google Patents
Detection method, system and device for transformer oil cooling loop Download PDFInfo
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- CN109725220B CN109725220B CN201910002707.9A CN201910002707A CN109725220B CN 109725220 B CN109725220 B CN 109725220B CN 201910002707 A CN201910002707 A CN 201910002707A CN 109725220 B CN109725220 B CN 109725220B
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Abstract
The invention discloses a detection method of a transformer oil cooling loop, which comprises the following steps: acquiring the oil temperature of transformer oil in a cooling loop and the actual working current value of an oil pump under the oil temperature; obtaining a theoretical working current value of the oil pump under the oil temperature according to the oil temperature; analyzing the actual working current value and the theoretical working current value, and determining the working states of the oil pump and the oil flow pipeline in the cooling circuit. The detection method can accurately detect the working states of the oil pump and the oil flow pipeline in the cooling circuit, comprehensively and truly reflect the running conditions of the oil pump and the oil flow pipeline, reduce false fault alarms and improve the detection reliability. The invention also discloses a detection system and a detection device for the transformer oil cooling loop, an electric locomotive and a computer readable storage medium, which have the technical effects.
Description
Technical Field
The invention relates to the technical field of locomotive transformer management, in particular to a detection method of a transformer oil cooling loop; the detection system and the detection device of the transformer oil cooling loop, the electric locomotive and a computer readable storage medium are further related.
Background
The cooling mode of the main transformer of the electric locomotive is that transformer oil is pumped to a forced draft cooling tower by an oil pump for cooling and then flows back to the transformer. If the oil pump can not work normally, the transformer can generate abnormal temperature rise in the running process, so the oil pump needs to be monitored. In order to monitor the working state of the oil pump, an oil flow relay or a flow meter is usually disposed in the oil circulation line to determine whether the oil pump is working normally. However, the mode of judging whether the oil pump works normally through the oil flow relay has certain limitation, and the oil flow relay can well reflect the working state of the oil pump under the conditions of low oil viscosity and good fluidity; and under the conditions of high oil viscosity and poor fluidity, when the oil flow speed is not enough to enable the force applied to the oil flow relay blade to overcome the resistance of the damping spring, the oil flow relay can not effectively reflect the actual working state of the oil pump, so that the failure of the oil flow relay is caused, and the false alarm of oil flow faults is carried out. And the oil flow relay cannot respond to the fault state of the oil circulation pipeline under the condition that the oil circulation pipeline has large leakage quantity or is blocked. In addition, whether the oil pump normally works or not is judged through the flow meter, and the flow meter can further reduce the fluidity of the cooling oil under the conditions of high oil viscosity and poor fluidity because the flow meter can increase the resistance in the circulating pipeline, so that certain risks are brought to system cooling.
In view of this, how to accurately and comprehensively detect the working state of the transformer oil cooling loop and reduce the false alarm probability of faults is a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
The invention aims to provide a method, a system and a device for detecting a transformer oil cooling loop, an electric locomotive and a computer readable storage medium, which can accurately detect the working state of the transformer oil cooling loop, comprehensively and truly reflect the running conditions of an oil pump and an oil flow pipeline, reduce false fault alarms and improve the detection reliability.
In order to solve the technical problem, the invention provides a detection method of a transformer oil cooling loop, which comprises the following steps:
acquiring the oil temperature of transformer oil in a cooling loop and the actual working current value of an oil pump under the oil temperature;
obtaining a theoretical working current value of the oil pump under the oil temperature according to the oil temperature;
analyzing the actual working current value and the theoretical working current value, and determining the working states of the oil pump and the oil flow pipeline in the cooling circuit.
Optionally, obtaining the theoretical working current value of the oil pump under the oil temperature according to the oil temperature includes:
and obtaining the theoretical working current value of the oil pump under the oil temperature through an oil temperature-oil pump current characteristic function according to the oil temperature.
Optionally, the analyzing the actual operating current value and the theoretical operating current value to obtain the operating state of the cooling circuit includes:
judging whether the actual working current value is zero or not;
if the actual working current value is zero, the oil pump does not work;
if the actual working current value is not zero, calculating the difference value between the actual working current value and the theoretical working current value, and comparing the difference value with a preset current error value;
if the difference value is smaller than or equal to the preset current error value, the oil pump works normally and the oil flow pipeline is normal;
if the difference value is larger than the preset current error value, comparing the actual working current value with the theoretical working current value;
if the actual working current value is larger than the theoretical working current value, the oil flow pipeline is blocked or the oil pump works abnormally;
and if the actual working current value is smaller than the theoretical working current value, the oil flow pipeline leaks.
Optionally, before obtaining the theoretical working current value of the oil pump at the oil temperature according to the oil temperature, the method further includes:
judging whether the oil temperature-oil pump current characteristic function exists or not;
if so, executing the theoretical working current value of the transformer under the oil temperature and subsequent steps according to the oil temperature;
and if the actual working current value does not exist, analyzing the actual working current value to determine the working state of the oil pump.
Optionally, the analyzing the actual operating current value to determine the operating state of the oil pump includes:
judging whether the actual working current value is zero or not;
if the actual working current value is zero, the oil pump does not work;
if the actual working current value is not zero, comparing the actual working current value with the locked rotor current value;
if the actual working current value is smaller than the locked-rotor current value, the oil pump works normally;
if the actual working current is not smaller than the locked-rotor current value, judging whether the oil temperature is lower than an oil temperature threshold value;
if the oil temperature is lower than the oil temperature threshold value, the oil pump works normally;
and if the oil temperature is not lower than the oil temperature threshold value, the oil pump works abnormally.
In order to solve the above technical problem, the present invention further provides a detection system for a transformer oil cooling loop, including:
the system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring the oil temperature of transformer oil in a cooling circuit and the actual working current value of an oil pump under the oil temperature;
the processing module is used for obtaining a theoretical working current value of the oil pump under the oil temperature according to the oil temperature;
and the first analysis module is used for analyzing the actual working current value and the theoretical working current value and determining the working states of the oil pump and the oil flow pipeline in the cooling circuit.
Optionally, the method further includes:
the judging module is used for judging whether an oil temperature-oil pump current characteristic function exists or not;
the starting module is used for starting the processing module and the first analysis module if an oil temperature-oil pump current characteristic function exists so as to execute the theoretical working current value of the oil pump under the oil temperature and subsequent steps according to the oil temperature;
and the second analysis module is used for analyzing the actual working current value to determine the working state of the oil pump if the oil temperature-oil pump current characteristic function does not exist.
In order to solve the above technical problem, the present invention further provides a detection apparatus for a transformer oil cooling loop, including:
the temperature sensor is used for acquiring the oil temperature of transformer oil in the cooling circuit;
the current sensor is used for acquiring the actual working current value of the oil pump under the oil temperature;
the central processing unit is used for obtaining the theoretical working current value of the oil pump under the oil temperature according to the oil temperature; analyzing the actual working current value and the theoretical working current value, and determining the working states of the oil pump and the oil flow pipeline in the cooling circuit.
In order to solve the technical problem, the invention further provides an electric locomotive, and the electric locomotive is provided with the detection device of the transformer oil cooling loop.
In order to solve the above technical problem, the present invention further provides a computer-readable storage medium, wherein a computer program is stored on the computer-readable storage medium, and when being executed by a processor, the computer program implements the steps of the method for detecting the transformer oil cooling loop according to any one of the above aspects.
The invention provides a detection method of a transformer oil cooling loop, which comprises the following steps: acquiring the oil temperature of transformer oil in a cooling loop and the actual working current value of an oil pump under the oil temperature; obtaining a theoretical working current value of the oil pump under the oil temperature according to the oil temperature; analyzing the actual working current value and the theoretical working current value, and determining the working states of the oil pump and the oil flow pipeline in the cooling circuit.
Therefore, according to the detection method of the transformer oil cooling loop, the theoretical working current value of the oil pump under the oil temperature is obtained by collecting the oil temperature of the transformer oil, and the theoretical working current value and the actual working current value of the oil pump under the oil temperature are further analyzed, so that the working states of the oil pump and the oil flow pipeline in the cooling loop are obtained. The detection method fully considers the influence of temperature on the fluidity of the transformer oil, effectively breaks through the limitation of judging whether the oil pump works normally or not through the oil flow relay and the flowmeter, can avoid the uncertainty of a detection result under a low-temperature working condition, realizes the accurate detection of the working state of the cooling circuit, comprehensively and truly reflects the running conditions of the oil pump and the oil flow pipeline in the cooling circuit, reduces false fault alarms, and improves the detection reliability.
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 of the present invention or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic flow chart of a method for detecting an oil cooling loop of a transformer according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an oil temperature acquisition provided by an embodiment of the present invention;
FIG. 3 is a schematic diagram of current collection provided by an embodiment of the present invention;
FIG. 4 is a schematic flow chart of another method for detecting an oil cooling circuit of a transformer according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a detection system of a transformer oil cooling loop according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a detecting apparatus for an oil cooling circuit of a transformer according to an embodiment of the present invention.
Detailed Description
The core of the invention is to provide a method, a system and a device for detecting the transformer oil cooling loop, an electric locomotive and a computer readable storage medium, which can accurately detect the working state of the transformer oil cooling loop, comprehensively and truly reflect the running conditions of an oil pump and an oil flow pipeline, reduce false fault alarms and improve the detection reliability.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic flow chart illustrating a method for detecting an oil cooling loop of a transformer according to an embodiment of the present invention; as can be seen from fig. 1, the detection method includes:
s101: acquiring the oil temperature of transformer oil in a cooling loop and the actual working current value of an oil pump under the oil temperature;
specifically, the step aims to collect the oil temperature of the transformer oil in the cooling circuit and the actual working current of the oil pump so as to provide a reference basis for the subsequent working state analysis. Referring to fig. 2 and fig. 3, a temperature sensor may be disposed on the oil flow pipeline to collect the oil temperature of the transformer oil; a current sensor can be arranged on a power supply of the oil pump so as to collect the actual working current of the oil pump through the current sensor.
S102: obtaining a theoretical working current value of the oil pump under the oil temperature according to the oil temperature;
specifically, on the basis of acquiring the oil temperature of the transformer oil, the theoretical working current of the oil pump under the oil temperature is further acquired according to the oil temperature. For example, a corresponding theoretical working current value can be obtained through a correlation function according to the collected oil temperature; or the corresponding theoretical working current value can be determined by looking up a table and the like according to the collected oil temperature; the appropriate mode can be selected according to actual needs.
Optionally, obtaining the theoretical operating current value of the oil pump under the oil temperature according to the oil temperature may include: and obtaining the theoretical working current value of the oil pump under the oil temperature through an oil temperature-oil pump current characteristic function according to the oil temperature.
Specifically, the transformer and the cooling loop can be subjected to combined matching test in advance, working current data of the oil pump under different oil temperatures are measured, and then an oil temperature-oil pump current characteristic function is obtained through fitting, so that after the oil temperature of the transformer oil is acquired, the oil temperature is compared with the oil temperature-oil pump current characteristic function, the data of the oil temperature can be specifically substituted into the oil temperature-oil pump current characteristic function, and the theoretical working current value of the oil pump under the oil temperature is obtained.
S103: and analyzing the actual working current value and the theoretical working current value, and determining the working states of an oil pump and an oil flow pipeline in the cooling circuit.
Specifically, after the actual working current value and the theoretical working current value of the oil pump are obtained, the actual working current value and the theoretical working current value can be analyzed, so that the working states of the oil pump and the oil flow pipeline in the cooling circuit can be determined. And further, the obtained working state analysis result can be transmitted to display equipment in real time through a network so as to prompt a driver or overhaul and maintenance personnel to carry out fault treatment in time.
In a specific real-time manner, the analyzing the actual operating current value and the theoretical operating current value to determine the operating states of the oil pump and the oil flow line in the cooling circuit may include: judging whether the actual working current value is zero or not; if the actual working current value is zero, the oil pump does not work; if the actual working current value is not zero, calculating the difference value between the actual working current value and the theoretical working current value, and comparing the difference value with the preset current error value; if the difference value is less than or equal to the preset current error value, the oil pump works normally and the oil flow pipeline is normal; if the difference value is larger than the preset current error value, comparing the actual working current value with the theoretical working current value; if the actual working current value is larger than the theoretical working current value, the oil flow pipeline is blocked or the oil pump works abnormally; and if the actual working current value is smaller than the theoretical working current value, the oil flow pipeline leaks.
Specifically, the present embodiment fully considers various possible operating states of the oil pump and the oil flow pipeline in the cooling circuit, so as to achieve a comprehensive and real operation of the oil pump and the oil flow pipeline. Specifically, whether the actual working current value of the oil pump is zero or not can be judged, if so, the oil pump is in an out-of-operation state, if not, the difference value between the actual working current value and the theoretical working current value of the oil pump is further calculated, the difference value is compared with a preset current error value, specifically, the absolute value of the difference value is taken and then compared with the preset current error value, and if the difference value is smaller than or equal to the preset current error value, the oil pump works normally and the oil flow pipeline is normal; on the contrary, if the difference is larger than the preset current error value, it indicates that the oil pump or the oil flow pipeline is abnormal, so the actual working current value is further compared with the theoretical working current value to determine the specific fault condition. If the actual working current value is larger than the theoretical working current value, the oil flow pipeline is blocked or the oil pump works abnormally; and if the actual working current value is smaller than the theoretical working current value, the oil flow pipeline leaks.
The specific value of the preset current error value is not limited uniquely, and the difference setting can be performed according to the actual situation.
In summary, the method for detecting the transformer oil cooling loop provided by the present invention acquires the oil temperature of the transformer oil, further obtains the theoretical operating current value of the oil pump at the oil temperature, and further analyzes the theoretical operating current value and the actual operating current value of the oil pump at the oil temperature, thereby obtaining the operating states of the oil pump and the oil flow pipeline in the cooling loop. The detection method fully considers the influence of temperature on the fluidity of the transformer oil, effectively breaks through the limitation of judging whether the oil pump works normally or not through the oil flow relay and the flowmeter, can avoid the uncertainty of a detection result under a low-temperature working condition, realizes accurate detection of the working state of the cooling circuit, comprehensively and truly reflects the running condition of the oil pump, namely an oil flow pipeline in the cooling circuit, reduces false fault alarm, and improves the detection reliability.
Referring to fig. 4, fig. 4 is a schematic diagram illustrating another method for detecting an oil cooling loop of a transformer according to an embodiment of the present invention; as can be seen from fig. 4, in this embodiment, before the step S203 is executed, the method further includes, before obtaining the theoretical operating current value of the oil pump at the oil temperature according to the oil temperature:
s202: judging whether an oil temperature-oil pump current characteristic function exists or not;
if so, obtaining the theoretical working current value of the transformer under the oil temperature according to the oil temperature and performing the subsequent steps; executing step S203 and step S204;
s205: and if the current does not exist, analyzing the actual working current value to determine the working state of the oil pump.
Specifically, the above-mentioned embodiment of obtaining the theoretical operating current of the oil pump according to the oil temperature-oil pump current characteristic function needs to be implemented on the premise of obtaining the oil temperature-oil pump current characteristic function by fitting in advance, and if there is no oil temperature-oil pump current characteristic function, the subsequent operation cannot be normally performed. Therefore, for the case that there may be no oil temperature-oil pump current characteristic function, in this embodiment, after the oil temperature of the transformer oil in the cooling circuit and the actual operating current value of the oil pump at the oil temperature are collected, it is first determined whether there is an oil temperature-oil pump current characteristic function, and if there is an oil temperature-oil pump current characteristic function, steps S203 and S204 are sequentially executed to analyze the operating states of the oil pump and the oil flow pipeline. If the oil temperature-oil pump current characteristic function does not exist, the working state of the oil pump is analyzed only according to the actual working current value of the oil pump. For step S203 and step S204, details thereof are not repeated, and reference may be made to corresponding parts of the above embodiments.
In a specific embodiment, the analyzing the actual operating current value to determine the operating state of the oil pump includes: judging whether the actual working current value is zero or not; if the actual working current value is zero, the oil pump does not work; if the actual working current value is not zero, comparing the actual working current value with the locked rotor current value; if the actual working current value is smaller than the locked rotor current value, the oil pump works normally; if the actual working current is not less than the locked-rotor current value, judging whether the oil temperature is lower than an oil temperature threshold value or not; if the oil temperature is lower than the oil temperature threshold value, the oil pump works normally; and if the oil temperature is not lower than the oil temperature threshold value, the oil pump works abnormally.
Specifically, the present embodiment determines all possible operating states of the oil pump, specifically determines whether the oil pump is operating by determining whether the actual operating current of the oil pump is zero, and if the actual operating current value is zero, it indicates that the oil pump is not operating; and if the actual working current is not zero, indicating that the oil pump works. Therefore, on the basis of the operation of the oil pump, whether the oil pump works normally is further judged, the actual working current value and the locked-rotor current value can be compared specifically, if the actual working current value is smaller than the locked-rotor current value, the oil pump works normally, if the actual working current value is not smaller than the locked-rotor current value, the reason may be that the oil pump works abnormally, and may also be other reasons, such as oil temperature, when the oil temperature is higher, the viscosity of the transformer oil is lower, the flowability is good, the working resistance of the oil pump is small, and the working current is small; on the contrary, when the oil temperature is lower, the viscosity of the transformer oil is higher, the fluidity is poor, the working resistance of the oil pump is large, and the working current is large. Therefore, the influence of the oil temperature on the judgment of the working state of the oil pump needs to be eliminated. Therefore, whether the oil temperature is lower than the oil temperature threshold value or not can be further judged, if the oil temperature is lower than the oil temperature threshold value, the oil pump works normally, and oil flow abnormity alarming is not needed; if the oil temperature is not lower than the oil temperature threshold value, the oil pump works abnormally, and a fault alarm needs to be carried out.
Wherein, can set up suitable numerical value to above-mentioned locked-rotor current value according to the electric current value when the locked-rotor takes place for the oil pump. In addition, the above-mentioned oil temperature threshold value may also be set appropriately based on an experiment or an actual running operation.
The detection method provided by the embodiment can accurately detect the working state of the oil pump even under the condition that no oil temperature-oil pump current characteristic function exists, so that the working state of the oil pump is truly reflected, false fault alarm is reduced, and the detection reliability is improved.
The invention also provides a detection system of the transformer oil cooling loop, and the system described below can be mutually and correspondingly referred to the method described above. Referring to fig. 5, fig. 5 is a schematic diagram of a detection system of a transformer oil cooling loop according to an embodiment of the present invention, and it can be seen from fig. 5 that the detection system includes:
the acquisition module 10 is used for acquiring the oil temperature of the transformer oil in the cooling circuit and the actual working current value of the oil pump under the oil temperature;
the processing module 20 is used for obtaining a theoretical working current value of the oil pump under the oil temperature according to the oil temperature;
the first analysis module 30 is configured to analyze the actual operating current value and the theoretical operating current value, and determine the operating states of an oil pump and an oil flow pipeline in the cooling circuit.
On the basis of the above embodiment, optionally, the processing module 20 is specifically configured to obtain a theoretical operating current value of the oil pump under the oil temperature through an oil temperature-oil pump current characteristic function according to the oil temperature.
On the basis of the above embodiment, optionally, the first analysis module 30 includes:
the first judging unit is used for judging whether the actual working current value is zero or not; if the actual working current value is zero, the oil pump does not work;
the first comparison unit is used for comparing the actual working current value with the locked rotor current value if the actual working current value is not zero; if the actual working current value is smaller than the locked rotor current value, the oil pump works normally;
the second judgment unit is used for judging whether the oil temperature is lower than the oil temperature threshold value or not if the actual working current is not smaller than the locked rotor current value; if the oil temperature is lower than the oil temperature threshold value, the oil pump works normally; and if the oil temperature is not lower than the oil temperature threshold value, the oil pump works abnormally.
On the basis of the above embodiment, optionally, the method further includes:
the judging module is used for judging whether an oil temperature-oil pump current characteristic function exists or not;
the starting module is used for starting the processing module 20 and the first analysis module 30 if an oil temperature-oil pump current characteristic function exists so as to obtain a theoretical working current value of the oil pump under the oil temperature and subsequent steps according to the oil temperature;
and the second analysis module is used for analyzing the actual working current value to determine the working state of the oil pump if the oil temperature-oil pump current characteristic function does not exist.
On the basis of the foregoing embodiment, optionally, the second analysis module includes:
the third judging unit is used for judging whether the actual working current value is zero or not; if the actual working current value is zero, the oil pump does not work;
the second comparison unit is used for comparing the actual working current value with the locked rotor current value if the actual working current value is not zero; if the actual working current value is smaller than the locked rotor current value, the oil pump works normally;
the fourth judging unit is used for judging whether the oil temperature is lower than the oil temperature threshold value or not if the actual working current is not smaller than the locked rotor current value; if the oil temperature is lower than the oil temperature threshold value, the oil pump works normally; and if the oil temperature is not lower than the oil temperature threshold value, the oil pump works abnormally.
Referring to fig. 6, fig. 6 is a schematic view of a detection apparatus for a transformer oil cooling loop according to an embodiment of the present invention, and with reference to fig. 6, the detection apparatus includes:
the temperature sensor 11 is used for acquiring the oil temperature of transformer oil in the cooling circuit;
the current sensor 12 is used for collecting the actual working current value of the oil pump under the oil temperature;
the central processing unit 13 is used for obtaining the theoretical working current value of the oil pump under the oil temperature according to the oil temperature; and analyzing the actual working current value and the theoretical working current value, and determining the working states of an oil pump and an oil flow pipeline in the cooling circuit.
For the introduction of the detection device provided by the present invention, please refer to the embodiment of the detection method, which is not described herein again.
The invention also provides an electric locomotive, which is provided with the detection device of the transformer oil cooling loop, and for the introduction of the electric locomotive provided by the invention, reference is made to the embodiment of the detection device, and the description of the invention is omitted here.
The present invention also provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of:
acquiring the oil temperature of transformer oil in a cooling loop and the actual working current value of an oil pump under the oil temperature; obtaining a theoretical working current value of the oil pump under the oil temperature according to the oil temperature; and analyzing the actual working current value and the theoretical working current value, and determining the working states of an oil pump and an oil flow pipeline in the cooling circuit.
The computer-readable storage medium may include: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device, the apparatus and the computer-readable storage medium disclosed by the embodiments correspond to the method disclosed by the embodiments, so that the description is simple, and the relevant points can be referred to the description of the method.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The present invention provides a method, a system, a device, an electric locomotive and a computer readable storage medium for detecting a transformer oil cooling loop. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (9)
1. A detection method for a transformer oil cooling loop is characterized by comprising the following steps:
acquiring the oil temperature of transformer oil in a cooling loop and the actual working current value of an oil pump under the oil temperature;
obtaining a theoretical working current value of the oil pump under the oil temperature according to the oil temperature;
analyzing the actual working current value and the theoretical working current value, and determining the working states of the oil pump and the oil flow pipeline in the cooling circuit;
analyzing the actual working current value and the theoretical working current value to determine the working states of the oil pump and the oil flow pipeline in the cooling circuit, wherein the method comprises the following steps:
judging whether the actual working current value is zero or not;
if the actual working current value is zero, the oil pump does not work;
if the actual working current value is not zero, calculating the difference value between the actual working current value and the theoretical working current value, and comparing the difference value with a preset current error value;
if the difference value is smaller than or equal to the preset current error value, the oil pump works normally and the oil flow pipeline is normal;
if the difference value is larger than the preset current error value, comparing the actual working current value with the theoretical working current value;
if the actual working current value is larger than the theoretical working current value, the oil flow pipeline is blocked or the oil pump works abnormally;
and if the actual working current value is smaller than the theoretical working current value, the oil flow pipeline leaks.
2. The method for detecting according to claim 1, wherein the obtaining of the theoretical operating current value of the oil pump at the oil temperature according to the oil temperature includes:
and obtaining the theoretical working current value of the oil pump under the oil temperature through an oil temperature-oil pump current characteristic function according to the oil temperature.
3. The method according to claim 2, wherein before obtaining the theoretical operating current value of the oil pump at the oil temperature according to the oil temperature, the method further comprises:
judging whether the oil temperature-oil pump current characteristic function exists or not;
if so, executing the theoretical working current value of the transformer under the oil temperature and subsequent steps according to the oil temperature;
and if the actual working current value does not exist, analyzing the actual working current value to determine the working state of the oil pump.
4. The sensing method of claim 3, wherein said analyzing said actual operating current value to determine an operating condition of said oil pump comprises:
judging whether the actual working current value is zero or not;
if the actual working current value is zero, the oil pump does not work;
if the actual working current value is not zero, comparing the actual working current value with the locked rotor current value;
if the actual working current value is smaller than the locked-rotor current value, the oil pump works normally;
if the actual working current is not smaller than the locked-rotor current value, judging whether the oil temperature is lower than an oil temperature threshold value;
if the oil temperature is lower than the oil temperature threshold value, the oil pump works normally;
and if the oil temperature is not lower than the oil temperature threshold value, the oil pump works abnormally.
5. A detection system of a transformer oil cooling loop, which is used for realizing the detection method of the transformer oil cooling loop as claimed in claim 1, and comprises the following steps:
the system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring the oil temperature of transformer oil in a cooling circuit and the actual working current value of an oil pump under the oil temperature;
the processing module is used for obtaining a theoretical working current value of the oil pump under the oil temperature according to the oil temperature;
and the first analysis module is used for analyzing the actual working current value and the theoretical working current value and determining the working states of the oil pump and the oil flow pipeline in the cooling circuit.
6. The detection system of claim 5, further comprising:
the judging module is used for judging whether an oil temperature-oil pump current characteristic function exists or not;
the starting module is used for starting the processing module and the first analysis module if an oil temperature-oil pump current characteristic function exists so as to execute the theoretical working current value of the oil pump under the oil temperature and subsequent steps according to the oil temperature;
and the second analysis module is used for analyzing the actual working current value to determine the working state of the oil pump if the oil temperature-oil pump current characteristic function does not exist.
7. A detection device of a transformer oil cooling loop, which is used for realizing the detection method of the transformer oil cooling loop according to claim 1, and comprises the following steps:
the temperature sensor is used for acquiring the oil temperature of transformer oil in the cooling circuit;
the current sensor is used for acquiring the actual working current value of the oil pump under the oil temperature;
the central processing unit is used for obtaining the theoretical working current value of the oil pump under the oil temperature according to the oil temperature; analyzing the actual working current value and the theoretical working current value, and determining the working states of the oil pump and the oil flow pipeline in the cooling circuit.
8. An electric locomotive, characterized in that it is provided with a detection device of a transformer oil cooling circuit according to claim 7.
9. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a computer program which, when being executed by a processor, carries out the steps of the method for detecting a transformer oil cooling circuit according to any one of claims 1 to 4.
Priority Applications (1)
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| CN111141982A (en) * | 2020-01-02 | 2020-05-12 | 中车青岛四方机车车辆股份有限公司 | Traction transformer oil flow abnormal fault detection device and method |
| CN113071537B (en) * | 2020-01-06 | 2022-11-08 | 株洲中车时代电气股份有限公司 | Early warning method, device and system for cooling system |
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