CN108956184B - Method and device for quantitatively measuring heat dissipation efficiency of transformer strong oil air-cooled cooler - Google Patents
Method and device for quantitatively measuring heat dissipation efficiency of transformer strong oil air-cooled cooler Download PDFInfo
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- CN108956184B CN108956184B CN201811080359.9A CN201811080359A CN108956184B CN 108956184 B CN108956184 B CN 108956184B CN 201811080359 A CN201811080359 A CN 201811080359A CN 108956184 B CN108956184 B CN 108956184B
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Abstract
The application discloses a method and a device for quantitatively measuring the heat dissipation efficiency of a transformer strong oil air-cooled cooler, wherein the method is used for calculating the current heat dissipation efficiency value of a single-group cooler by measuring the current temperature data of an oil inlet pipe, an oil return pipe and an air inlet of the single-group cooler in operation on site and introducing elevation and solar radiation correction factors; by comparing the heat dissipation efficiency value with the preset heat dissipation efficiency lower limit value, when the heat dissipation efficiency value is lower than the preset heat dissipation efficiency lower limit value, after the problems of a cooler oil pump and a fan are eliminated, the reduction of the heat dissipation efficiency caused by the dirt of the cooler can be determined, and the cooler fins need to be washed. The method and the device realize quantitative evaluation of the heat dissipation efficiency of the single-group strong oil air-cooled cooler, consider the factors of altitude and solar radiation, have high accuracy and effectively avoid the blindness of the traditional cooler maintenance.
Description
Technical Field
The application relates to the technical field of transformers, in particular to a method and a device for quantitatively measuring heat dissipation efficiency of a strong oil air-cooled cooler of a transformer.
Background
Transformers are critical devices in the power grid that generate a large amount of heat during operation due to empty load losses. In order to maintain the heat balance of the transformer, the heat is taken away by the transformer oil, and then is transferred into the air by the cooler. Referring to fig. 1, hot oil in a transformer oil tank 1 enters a strongest oil-air cooler 3 through an oil inlet pipe 2, the hot oil is cooled in the strongest oil-air cooler 3, and formed cold oil enters the transformer oil tank again through an oil return pipe 4 and an oil pump 5 to absorb heat generated by a transformer, so that a cooling cycle is formed, wherein each group of coolers is provided with a cooler fan 6.
In the actual operation of the transformer and the cooler thereof, the oil temperature is increased due to the reduction of the efficiency of the cooler, the expansion of the transformer oil is increased, the oil level is increased, the internal pressure is increased, the pressure relief valve is operated, and the forced shutdown inspection of the transformer is caused. For maintenance measures of transformer coolers, the energy agency (2014 edition) requires: 12.6.10 for ensuring the cooling effect, the tubular transformer cooler should be flushed 1-2 times per year, and should be arranged before the coming of heavy load. In practice, however, due to the difference of the transformer operating environment, the dirty and blocked condition of the cooler is different, and if the cooler is flushed according to the set flushing period, the flushing is blind, which is not favorable for the safe, stable and economic operation of the transformer.
Disclosure of Invention
The application provides a method and a device for quantitatively measuring the heat dissipation efficiency of a transformer strong oil air-cooled cooler, which are used for solving the problem that the existing cooler is washed according to a set washing period and is under-maintained or over-maintained.
In a first aspect, the application provides a method for quantitatively determining the heat dissipation efficiency of a transformer strong oil air-cooled cooler, which comprises the following steps:
measuring a current equipment temperature of a single set of transformer coolers in operation;
determining the heat dissipation power of the cooler according to the current equipment temperature of the cooler, and performing rated correction on the heat dissipation power;
determining the heat dissipation efficiency of the cooler according to the heat dissipation power after the rated correction, and performing environmental correction on the heat dissipation efficiency;
and outputting an alarm signal according to the heat dissipation efficiency of the cooler after the environment correction and a preset lower limit value of the heat dissipation efficiency.
Further, the current equipment temperature of the cooler comprises the outer wall temperature of the oil inlet pipe, the outer wall temperature of the oil return pipe and the air temperature of the air inlet; the determining of the heat dissipation power of the cooler according to the current equipment temperature of the cooler comprises calculating the heat dissipation power of the cooler according to the following formula:
P＝Q×ρ×C×(T0-Ti)
wherein, P represents the heat dissipation power of the single group of coolers;
q represents the flow of the transformer oil;
ρ represents (T)0-Ti) Transformer oil density at temperature/2;
c represents (T)0-Ti) The specific heat capacity of the transformer oil at the temperature of 2 ℃;
T0indicating the temperature of the outer wall of the oil inlet pipe;
Tiindicating the temperature of the outer wall of the return pipe.
Further, the performing rated correction on the heat dissipation power includes: with the temperature T of the outer wall of the oil inlet pipe0Replacing the oil temperature of the oil inlet pipe according to the rated power of the coolerAnd (3) correcting the heat dissipation power to the heat dissipation power under the measurement condition according to the following formula:
in the formula, PCorrectionRepresenting the heat dissipation power after rated correction;
Taindicating the cooler inlet air temperature.
Further, the determining the heat dissipation efficiency of the cooler according to the heat dissipation power after the rated correction and performing the environmental correction on the heat dissipation efficiency includes determining the heat dissipation efficiency of the cooler according to the following formula and performing the environmental correction:
wherein eta represents the heat dissipation efficiency after the environmental correction;
Pnindicating the rated heat dissipation efficiency of the cooler at the current equipment temperature;
λ represents an altitude correction factor and σ represents a solar radiation correction factor.
Further, the outputting an alarm signal according to the heat dissipation efficiency η of the cooler after the environmental correction and the preset lower limit τ of the heat dissipation efficiency includes:
judging whether the heat dissipation efficiency eta of the cooler after the environment correction is smaller than a preset heat dissipation efficiency lower limit value tau or not;
if the heat dissipation efficiency eta of the cooler after the environment correction is smaller than a preset heat dissipation efficiency lower limit value tau, outputting a heat dissipation abnormity early warning signal of the cooler;
and if the heat dissipation efficiency eta of the cooler after the environment correction is greater than or equal to a preset heat dissipation efficiency lower limit value tau, outputting a normal heat dissipation signal of the cooler.
Further, the method further comprises:
if outputting a heat radiation abnormal signal of the cooler, checking the working states of a cooler oil pump and a cooling fan;
if the working states of the cooler oil pump and the cooler fan are abnormal, outputting a signal that the oil pump or the fan needs to be maintained;
and if the working states of the cooler oil pump and the cooler fan are normal, outputting a signal that the cooler needs to be flushed for maintenance.
In a second aspect, the present application provides a device for quantitatively determining heat dissipation efficiency of a forced oil air-cooled cooler of a transformer, the device comprising:
the temperature measuring unit is used for measuring the current equipment temperature of the transformer cooler in operation;
the first calculation unit is used for determining the heat dissipation power of the cooler according to the current equipment temperature of the cooler and performing rated correction on the heat dissipation power;
the second calculation unit is used for determining the heat dissipation efficiency of the cooler according to the heat dissipation power after the rated correction and performing environmental correction on the heat dissipation efficiency;
and the alarm unit is used for outputting an alarm signal according to the heat dissipation efficiency of the cooler after the environment correction and a preset lower limit value of the heat dissipation efficiency.
According to the technical scheme, the method and the device for quantitatively measuring the heat dissipation efficiency of the cooler of the strong oil air-cooled transformer are characterized in that a single group of strong oil air-cooled coolers are taken as objects, the current temperature data of an oil inlet pipe, an oil return pipe and an air inlet of the single group of coolers in operation are measured on site, elevation and solar radiation correction factors are introduced, and the current heat dissipation efficiency value of the single group of coolers is calculated; by comparing the heat dissipation efficiency value with the preset heat dissipation efficiency lower limit value, when the heat dissipation efficiency value is lower than the preset heat dissipation efficiency lower limit value, after the problems of a cooler oil pump and a fan are eliminated, the reduction of the heat dissipation efficiency caused by the dirt of the cooler can be determined, and the cooler fins need to be washed. The method and the device realize quantitative evaluation of the heat dissipation efficiency of the single-group strong oil air-cooled cooler, consider the factors of altitude and solar radiation, have high accuracy and effectively avoid the blindness of the traditional cooler maintenance.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any creative effort.
Fig. 1 is a schematic structural diagram of a single-unit strong oil air-cooled cooler of a transformer according to an embodiment of the present application;
FIG. 2 is a flow chart illustrating a method for quantitatively determining the heat dissipation efficiency of a transformer forced oil air-cooled chiller according to an exemplary embodiment of the present application;
fig. 3 is a block diagram of an apparatus for quantitatively determining heat dissipation efficiency of a transformer forced oil air-cooled cooler according to an exemplary embodiment of the present application.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all 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 embodiment of the application provides a method for quantitatively measuring the heat dissipation efficiency of a transformer strong oil air-cooled cooler, which is at least suitable for the use scene of the strong oil air-cooled cooler, takes a single group of strongest oil air-cooled coolers of a transformer as an object, carries out online quantitative measurement on the heat dissipation efficiency of the strongest oil air-cooled cooler, and comprehensively considers factors such as the altitude of an installation place, solar radiation and the like so as to guide the maintenance of the transformer and avoid unsafe events caused by improper maintenance.
Referring to fig. 2, the method includes the steps of:
step S110, measuring the current equipment temperature of the running transformer cooler;
in this embodiment, the current equipment temperature of the cooler includes the outer wall temperature of the oil inlet pipeDegree T0Temperature T of outer wall of oil return pipeiAnd air inlet air temperature Ta. This embodiment is through setting up temperature sensor at advancing oil pipe outer wall, oil return pipe outer wall and air intake and come the temperature of real-time acquisition relevant position to give measuring device with the temperature value passback.
Optionally, the time interval or frequency for acquiring the temperature can be preset, so that the temperature of the cooler device is monitored while the data return amount is reduced, and the accuracy and the representativeness of the data are ensured.
Step S120, determining the heat dissipation power of the cooler according to the current equipment temperature of the cooler, and performing rated correction on the heat dissipation power;
preferably, the heat dissipation power of the cooler is calculated according to the following formula:
P＝Q×ρ×C×(T0-Ti)
wherein, P represents the heat dissipation power of the single group of coolers;
q represents the flow of the transformer oil;
ρ represents (T)0-Ti) Transformer oil density at temperature/2;
c represents (T)0-Ti) The specific heat capacity of the transformer oil at the temperature of 2 ℃;
T0indicating the temperature of the outer wall of the oil inlet pipe;
Tiindicating the temperature of the outer wall of the return pipe.
In some preferred embodiments of the present invention, the heat dissipation power is corrected to the heat dissipation power under the measurement condition based on the measurement condition of the rated heat dissipation power of the cooler.
For example, replacing the oil temperature of the oil inlet pipe with the outer wall temperature of the oil inlet pipe, and according to the measurement condition of the rated heat dissipation power of the cooler, if the measurement condition of the rated heat dissipation power of the cooler is not that the difference between the oil temperature of the oil inlet pipe and the air temperature of the air inlet is 40K, correcting the heat dissipation power to the heat dissipation power under the measurement condition according to the following formula:
in the formula, PCorrectionRepresenting the heat dissipation power after rated correction;
Taindicating the cooler inlet air temperature.
Step S130, determining the heat dissipation efficiency of the cooler according to the heat dissipation power after the rated correction, and performing environmental correction on the heat dissipation efficiency;
it should be noted that, as the altitude increases and the air becomes thinner, the heat dissipation efficiency of the cooler decreases; as the altitude increases, the ultraviolet rays become stronger, and the energy of the transformer cooler absorbing the solar radiation becomes larger. Therefore, in order to eliminate the influence of the environmental factors on the heat dissipation efficiency of the cooler and improve the accuracy of quantitative determination, in the embodiment, when the heat dissipation efficiency of the cooler is calculated, an altitude correction factor and a solar radiation correction factor are introduced, so that the environmental correction of the actually measured heat dissipation efficiency is realized.
Specifically, the heat dissipation efficiency of the cooler is determined and the environment is corrected according to the following formula:
wherein eta represents the heat dissipation efficiency after the environmental correction;
Pnindicating the rated heat dissipation efficiency of the cooler at the current equipment temperature;
λ represents an altitude correction factor and σ represents a solar radiation correction factor.
It should be noted that the altitude correction factor and the solar radiation correction factor are constants, and can be obtained through trial and error by simulating the use of the cooler in a high altitude area.
In the embodiment, the obtained quantized data of the heat dissipation efficiency of the transformer cooler solves the problem that the quantization index of the heat dissipation efficiency of the existing cooler is fuzzy, and has a strong guiding effect on the operation and maintenance of the cooler.
And step S140, outputting an alarm signal according to the heat dissipation efficiency of the cooler after the environment correction and a preset lower limit value of the heat dissipation efficiency.
Specifically, the step S140 of outputting an alarm signal according to the heat dissipation efficiency of the cooler after the environmental correction and the preset lower limit value of the heat dissipation efficiency includes:
judging whether the heat dissipation efficiency eta of the cooler after the environment correction is smaller than a preset heat dissipation efficiency lower limit value tau or not;
comparing the heat dissipation efficiency eta with a set lower limit value tau of the heat dissipation efficiency, and if eta is larger than or equal to tau, indicating that the heat dissipation efficiency of the cooler is normal; when eta < tau, the heat dissipation efficiency of the cooler is abnormal.
Further, if a heat radiation abnormal signal of the cooler is output, the working states of the oil pump of the cooler and the cooling fan are checked;
if the working states of the cooler oil pump and the cooler fan are abnormal, outputting a signal that the oil pump or the fan needs to be maintained;
and if the working states of the cooler oil pump and the cooler fan are normal, outputting a signal that the cooler needs to be flushed for maintenance.
According to the embodiment, the maintenance work of the cooler and the related transformer is guided according to the quantized data of the heat dissipation efficiency of the transformer cooler, so that the development of the maintenance work is more targeted, and the situations of under-maintenance and over-maintenance of the cooler are avoided.
The embodiment provides a method for quantitatively measuring the heat dissipation efficiency of a transformer strong oil air-cooled cooler, which is used for measuring the current equipment temperature of the transformer cooler in operation, wherein the current equipment temperature comprises current temperature data of an oil inlet pipe, an oil return pipe and an air inlet; determining the heat dissipation power of the cooler according to the current equipment temperature of the cooler, and performing rated correction on the heat dissipation power; determining the heat dissipation efficiency of the cooler according to the heat dissipation power after the rated correction, and introducing elevation and solar radiation correction factors to carry out environmental correction on the heat dissipation efficiency; comparing the heat dissipation efficiency of the cooler after the environmental correction with a preset lower limit value of the heat dissipation efficiency, and outputting an alarm signal; if the heat dissipation efficiency value is lower than the preset lower limit value of the heat dissipation efficiency, after the problems of the oil pump and the fan of the cooler are eliminated, the cooler can be determined to be required to be flushed for the reduction of the heat dissipation efficiency caused by the dirt of the cooler. The method realizes quantitative determination of the heat dissipation efficiency of the single-group strong oil air-cooled cooler, considers the factors of altitude and solar radiation, has high accuracy, and effectively avoids the blindness of the previous cooler maintenance.
According to the method for quantitatively determining the heat dissipation efficiency of the transformer strong oil air-cooled cooler, the application also provides a device for quantitatively determining the heat dissipation efficiency of the transformer strong oil air-cooled cooler, referring to fig. 3, the device comprises:
the temperature measuring unit U110 is used for measuring the current equipment temperature of the transformer cooler in operation;
the first calculation unit U120 is used for determining the heat dissipation power of the cooler according to the current equipment temperature of the cooler and performing rated correction on the heat dissipation power;
the second computing unit U130 is configured to determine the heat dissipation efficiency of the cooler according to the heat dissipation power after the rated correction, and perform environmental correction on the heat dissipation efficiency;
and the alarm unit U140 is used for outputting an alarm signal according to the heat dissipation efficiency of the cooler after the environment correction and a preset lower limit value of the heat dissipation efficiency.
Preferably, the current equipment temperature of the cooler comprises the outer wall temperature of the oil inlet pipe, the outer wall temperature of the oil return pipe and the air temperature of the air inlet; the first calculating unit U120 calculates the heat dissipation power of the cooler according to the following equation:
P＝Q×ρ×C×(T0-Ti)
wherein, P represents the heat dissipation power of the single group of coolers;
q represents the flow of the transformer oil;
ρ represents (T)0-Ti) Transformer oil density at temperature/2;
c represents (T)0-Ti) The specific heat capacity of the transformer oil at the temperature of 2 ℃;
T0indicating the temperature of the outer wall of the oil inlet pipe;
Tiindicating the temperature of the outer wall of the return pipe.
Preferably, the first computing unit U120, to the temperature T of the outer wall of the oil inlet pipe0Replacing the oil temperature of an oil inlet pipe, and correcting the heat dissipation power to the heat dissipation power under the measurement condition according to the following formula according to the measurement condition of the rated heat dissipation power of the cooler:
in the formula, PCorrectionRepresenting the heat dissipation power after rated correction;
Taindicating the cooler inlet air temperature.
Preferably, the second computing unit U130 determines the heat dissipation efficiency of the cooler and performs the environmental correction according to the following formula:
wherein eta represents the heat dissipation efficiency after the environmental correction;
Pnindicating the rated heat dissipation efficiency of the cooler at the current equipment temperature;
λ represents an altitude correction factor and σ represents a solar radiation correction factor.
Preferably, the alarm unit U140 is specifically configured to:
judging whether the heat dissipation efficiency eta of the cooler after the environment correction is smaller than a preset heat dissipation efficiency lower limit value tau or not;
if the heat dissipation efficiency eta of the cooler after the environment correction is smaller than a preset heat dissipation efficiency lower limit value tau, outputting a heat dissipation abnormity early warning signal of the cooler;
and if the heat dissipation efficiency eta of the cooler after the environment correction is greater than or equal to a preset heat dissipation efficiency lower limit value tau, outputting a normal heat dissipation signal of the cooler.
Preferably, the alarm unit U140 is further configured to:
if outputting a heat radiation abnormal signal of the cooler, checking the working states of a cooler oil pump and a cooling fan;
if the working states of the cooler oil pump and the cooler fan are abnormal, outputting a signal that the oil pump or the fan needs to be maintained;
and if the working states of the cooler oil pump and the cooler fan are normal, outputting a signal that the cooler needs to be flushed for maintenance.
The application provides a method and a device for quantitatively measuring the heat dissipation efficiency of a transformer strong oil air-cooled cooler, wherein the method is used for measuring the current equipment temperature of the transformer cooler in operation, and the current equipment temperature comprises the current temperature data of an oil inlet pipe, an oil return pipe and an air inlet; determining the heat dissipation power of the cooler according to the current equipment temperature of the cooler, and performing rated correction on the heat dissipation power; determining the heat dissipation efficiency of the cooler according to the heat dissipation power after the rated correction, and introducing elevation and solar radiation correction factors to carry out environmental correction on the heat dissipation efficiency; comparing the heat dissipation efficiency of the cooler after the environmental correction with a preset lower limit value of the heat dissipation efficiency, and outputting an alarm signal; if the heat dissipation efficiency value is lower than the preset lower limit value of the heat dissipation efficiency, after the problems of the oil pump and the fan of the cooler are eliminated, the fins of the cooler can be determined to need to be washed for the reason that the heat dissipation efficiency is reduced due to the dirt of the cooler. The method realizes quantitative determination of the heat dissipation efficiency of the single-group strong oil air-cooled cooler, considers the factors of altitude and solar radiation, has high accuracy, and effectively avoids the blindness of the previous cooler maintenance.
Those skilled in the art will readily appreciate that the techniques of the embodiments of the present invention may be implemented as software plus a required general purpose hardware platform. Based on such understanding, the technical solutions in the embodiments of the present invention may be essentially or partially implemented in the form of a software product, which may be stored in a storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the embodiments or some parts of the embodiments.
The same and similar parts in the various embodiments in this specification may be referred to each other. In particular, as for the apparatus embodiment, since it is substantially similar to the method embodiment, the description is simple, and the relevant points can be referred to the description in the method embodiment.
The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention.
Claims (4)
1. A method for quantitatively measuring the heat dissipation efficiency of a transformer strong oil air-cooled cooler is characterized by comprising the following steps:
measuring a current equipment temperature of a single set of transformer coolers in operation;
determining the heat dissipation power of the cooler according to the current equipment temperature of the cooler, and performing rated correction on the heat dissipation power;
determining the heat dissipation efficiency of the cooler according to the heat dissipation power after the rated correction, and performing environmental correction on the heat dissipation efficiency;
outputting an alarm signal according to the heat dissipation efficiency of the cooler after the environment correction and a preset lower limit value of the heat dissipation efficiency;
the current equipment temperature of the cooler comprises the outer wall temperature of the oil inlet pipe, the outer wall temperature of the oil return pipe and the air temperature of the air inlet; determining the heat dissipation power of the cooler according to the current equipment temperature of the cooler comprises calculating the heat dissipation power of the cooler according to the following formula:
P＝Q×ρ×C×(T0-Ti)
wherein, P represents the heat dissipation power of the single group of coolers;
q represents the flow of the transformer oil;
ρ represents (T)0-Ti) Transformer oil density at temperature/2;
c represents (T)0-Ti) The specific heat capacity of the transformer oil at the temperature of 2 ℃;
T0indicating the temperature of the outer wall of the oil inlet pipe;
Tiindicating the temperature of the outer wall of the oil return pipe;
the performing rated correction on the heat dissipation power includes: with the temperature T of the outer wall of the oil inlet pipe0Oil temperature and root of the oil inlet pipe are replacedAccording to the measuring condition of the rated heat dissipation power of the cooler, correcting the heat dissipation power to the heat dissipation power under the measuring condition according to the following formula:
in the formula, PCorrectionRepresenting the heat dissipation power after rated correction;
Taindicating the inlet air temperature of the cooler;
determining the heat dissipation efficiency of the cooler according to the heat dissipation power after the rated correction, and performing environmental correction on the heat dissipation efficiency, wherein the determining the heat dissipation efficiency of the cooler according to the following formula and performing the environmental correction comprises:
wherein eta represents the heat dissipation efficiency after the environmental correction;
Pnindicating the rated heat dissipation efficiency of the cooler at the current equipment temperature;
λ represents an altitude correction factor and σ represents a solar radiation correction factor.
2. The method according to claim 1, wherein the outputting an alarm signal according to the environment-corrected heat dissipation efficiency of the cooler and a preset lower limit value of the heat dissipation efficiency comprises:
judging whether the heat dissipation efficiency of the cooler after the environmental correction is smaller than a preset heat dissipation efficiency lower limit value or not;
if the heat dissipation efficiency of the cooler after the environment correction is smaller than a preset heat dissipation efficiency lower limit value, outputting a heat dissipation abnormity early warning signal of the cooler;
and if the heat dissipation efficiency of the cooler after the environment correction is greater than or equal to a preset heat dissipation efficiency lower limit value, outputting a normal heat dissipation signal of the cooler.
3. The method of claim 2, further comprising:
if the early warning signal of the abnormal heat dissipation of the cooler is output, checking the working states of an oil pump and a cooling fan of the cooler;
if the working states of the cooler oil pump and the cooler fan are abnormal, outputting a signal that the oil pump or the fan needs to be maintained;
and if the working states of the cooler oil pump and the cooler fan are normal, outputting a signal that the cooler needs to be flushed for maintenance.
4. The utility model provides a transformer forced oil forced air cooling cooler radiating efficiency quantifys survey device which characterized in that, the device includes:
the temperature measuring unit is used for measuring the current equipment temperature of the transformer cooler in operation;
the first calculation unit is used for determining the heat dissipation power of the cooler according to the current equipment temperature of the cooler and performing rated correction on the heat dissipation power;
the second calculation unit is used for determining the heat dissipation efficiency of the cooler according to the heat dissipation power after the rated correction and performing environmental correction on the heat dissipation efficiency;
the alarm unit is used for outputting an alarm signal according to the heat dissipation efficiency of the cooler after the environment correction and a preset lower limit value of the heat dissipation efficiency;
the current equipment temperature of the cooler comprises the outer wall temperature of the oil inlet pipe, the outer wall temperature of the oil return pipe and the air temperature of the air inlet; the first calculating unit calculates the heat dissipation power of the cooler according to the following formula:
P＝Q×ρ×C×(T0-Ti)
wherein, P represents the heat dissipation power of the single group of coolers;
q represents the flow of the transformer oil;
ρ represents (T)0-Ti) Transformer oil density at temperature/2;
c represents (T)0-Ti) The specific heat capacity of the transformer oil at the temperature of 2 ℃;
T0indicating the temperature of the outer wall of the oil inlet pipe;
Tiindicating the temperature of the outer wall of the oil return pipe;
the first calculation unit is used for calculating the temperature T of the outer wall of the oil inlet pipe0Replacing the oil temperature of an oil inlet pipe, and correcting the heat dissipation power to the heat dissipation power under the measurement condition according to the following formula according to the measurement condition of the rated heat dissipation power of the cooler:
in the formula, PCorrectionRepresenting the heat dissipation power after rated correction;
Taindicating the inlet air temperature of the cooler;
the second computing unit determines the heat dissipation efficiency of the cooler and performs environmental correction according to the following formula:
wherein eta represents the heat dissipation efficiency after the environmental correction;
Pnindicating the rated heat dissipation efficiency of the cooler at the current equipment temperature;
λ represents an altitude correction factor and σ represents a solar radiation correction factor.
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| CN111895327A (en) * | 2020-08-04 | 2020-11-06 | 广东众科智能科技股份有限公司 | 5G intelligent lamp comprehensive rod |
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| CN114459765B (en) * | 2022-01-24 | 2023-09-29 | 东风汽车股份有限公司 | Radiator cooling efficiency monitoring method |
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