CN110940850A - On-line monitoring method and system for electric power fitting power and storage medium - Google Patents
On-line monitoring method and system for electric power fitting power and storage medium Download PDFInfo
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- CN110940850A CN110940850A CN201911289691.0A CN201911289691A CN110940850A CN 110940850 A CN110940850 A CN 110940850A CN 201911289691 A CN201911289691 A CN 201911289691A CN 110940850 A CN110940850 A CN 110940850A
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
- G01R21/02—Arrangements for measuring electric power or power factor by thermal methods, e.g. calorimetric
Abstract
The invention discloses an electric power fitting power on-line monitoring method, a system and a storage medium, wherein the monitoring method comprises the following steps: acquiring the surface temperature, the mass and the specific heat capacity of the electric power fitting; fitting and calculating according to the surface temperature of the electric power fitting to obtain a thermal time constant and a steady-state temperature rise value; and calculating the power value consumed by the electric power fitting according to the thermal time constant, the steady-state temperature rise value, the mass and the specific heat capacity. By implementing the method and the device, the thermal time constant and the steady-state temperature rise value can be obtained according to the collected surface temperature of the electric power fitting, and the power value consumed by the electric power fitting can be calculated according to the steady-state temperature rise value, the mass, the specific heat capacity and the thermal time constant of the electric power fitting. In addition, the invention can realize the on-line monitoring of the power consumption of the electric power fitting in the power grid system, and meanwhile, the monitoring method can be used for not only a direct current transmission and distribution line, but also an alternating current transmission and distribution line, thereby expanding the application range of the monitoring method.
Description
Technical Field
The invention relates to the technical field of electric power fitting monitoring of a power grid system, in particular to a method and a system for monitoring electric power fitting power and a storage medium.
Background
The electric power fitting is a metal accessory which is used for connecting and combining various devices in a power grid system and plays a role in transmitting mechanical load, electrical load and certain protection. The hardware has a variety of types and different applications, for example, various wire clamps for installing wires, various suspension loops for forming insulator strings, various crimping tubes and repairing tubes for connecting the wires, various spacers on split wires, and various bracing wire hardware for towers. Most hardware fittings need to bear larger pulling force during operation, and some hardware fittings need to ensure good electrical contact at the same time, which is related to the safety of a lead or a tower, and even if one hardware fitting is damaged, a line fault can be caused. Therefore, monitoring parameters such as temperature and power of the electric power fittings in real time is an essential part of a power grid system.
Currently, monitoring of power of an electric power fitting is obtained by measuring a voltage across the electric power fitting and a current flowing through the electric power fitting. The monitoring method cannot realize the on-line monitoring of the electric power fitting power.
Disclosure of Invention
In view of this, embodiments of the present invention provide an online monitoring method, a system apparatus, and a storage medium for power fitting power, so as to solve the technical problem in the prior art that real-time online monitoring cannot be implemented when monitoring power fitting power.
The first aspect of the embodiments of the present invention provides an online monitoring method for power of an electric power fitting, where the monitoring method includes the following steps: acquiring the surface temperature, the mass and the specific heat capacity of the electric power fitting; fitting and calculating according to the surface temperature of the electric power fitting to obtain a thermal time constant and a steady-state temperature rise value; and calculating the power value consumed by the electric power fitting according to the thermal time constant, the steady-state temperature rise value, the mass and the specific heat capacity.
Optionally, the steady-state temperature rise value and the thermal time constant of the electric power fitting are obtained by fitting and calculating the following formulas:
wherein tau represents the surface temperature rise of the electric power fitting, and tauwRepresents a stable temperature rise value of the electric power fitting, T represents time, T represents a thermal time constant,
representing the correction factor of the power over time.
Optionally, the power value consumed by the electric power fitting is calculated by the following formula:
wherein c represents the specific heat capacity of the electric power fitting, and m represents the mass of the electric power fitting.
A second aspect of the embodiments of the present invention provides an online monitoring system for power of an electric power fitting, where the monitoring system includes: the temperature acquisition device is used for acquiring the surface temperature of the electric power fitting; the microprocessor is connected with the temperature acquisition device and is used for fitting and calculating according to the surface temperature of the electric power fitting to obtain a thermal time constant and a steady-state temperature rise value; and calculating the power value consumed by the electric power fitting according to the thermal time constant, the steady-state temperature rise value, the mass and the specific heat capacity.
Optionally, the temperature acquisition device is a wireless passive temperature acquisition device.
Optionally, the temperature acquisition device comprises: the surface acoustic wave sensor is connected with the electric power fitting, senses a surface temperature signal of the electric power fitting according to a first pulse signal sent by the temperature collector, converts the temperature signal into a second pulse signal and sends the second pulse signal to the temperature collector; and the temperature collector generates a surface temperature signal of the electric power fitting according to the second pulse signal, and sends the temperature signal to the temperature main control terminal for storage.
Optionally, data interaction is performed among the surface acoustic wave sensor, the temperature collector and the temperature main control terminal in a wireless communication mode.
A third aspect of the embodiments of the present invention provides a computer-readable storage medium, where computer instructions are stored, and the computer instructions are configured to cause a computer to execute the method for online monitoring of power fitting power according to any one of the first aspect and the first aspect of the embodiments of the present invention.
The technical scheme provided by the embodiment of the invention has the following advantages:
according to the online monitoring method, the online monitoring system and the storage medium for the power fitting power, provided by the embodiment of the invention, the power fitting power can be calculated according to the thermal time constant, the steady-state temperature rise value, the mass and the specific heat capacity of the power fitting by acquiring the surface temperature of the power fitting in real time. Therefore, the online monitoring method for the electric power fitting power provided by the embodiment of the invention can realize online monitoring of the electric power fitting power consumption in the power grid system, and in addition, the monitoring method can be used for not only a direct current transmission and distribution line, but also an alternating current transmission and distribution line, thereby expanding the application range of the monitoring method.
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 some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a flowchart of an online power hardware power monitoring method according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a temperature curve monitored in the online power hardware power monitoring method according to the embodiment of the invention;
fig. 3 is a block diagram of a system for online monitoring of power fitting power according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a hardware structure of the online power hardware power monitoring terminal according to the embodiment of the present invention.
Detailed Description
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.
The embodiment of the invention provides an online monitoring method for power fitting power, and as shown in fig. 1, the monitoring method comprises the following steps:
step S101: acquiring the surface temperature, the mass and the specific heat capacity of the electric power fitting; specifically, the real-time surface temperature of the electric power fitting connected in the electric power system may be obtained, the electric power system may be a direct current power transmission and distribution system or an alternating current power transmission and distribution system, the surface temperature may be obtained by a temperature sensor, or may be obtained by using other temperature acquisition devices, which is not limited in the present invention. The specific heat capacity of the electric power fitting can be obtained by a table look-up method.
Step S102: fitting and calculating according to the surface temperature of the electric power fitting to obtain a thermal time constant and a steady-state temperature rise value; specifically, the temperature rise of the surface of the electric power fitting within a period of time can be obtained to form a temperature rise-time curve, the temperature rise-time curve is subjected to fitting calculation according to the following formula to obtain a thermal time constant and a steady-state temperature rise value of the electric power fitting,
wherein tau represents the surface temperature rise of the electric power fitting, tauwRepresents the steady-state temperature rise value of the electric power fitting, T represents time, T represents a thermal time constant,
the formula (1) can be called as a temperature rise equation of the electric power fitting.
Step S103: and calculating the power value consumed by the electric power fitting according to the thermal time constant, the steady-state temperature rise value, the mass and the specific heat capacity. Specifically, after the thermal time constant and the steady-state temperature rise value of the electric power fitting are calculated, the power value consumed by the electric power fitting can be calculated by the following formula:
where c represents the specific heat capacity of the power fitting, and m represents the mass of the power fitting.
According to the on-line monitoring method for the power of the electric power fitting, provided by the embodiment of the invention, the surface temperature of the electric power fitting in a power grid system is collected in real time, and the power of the electric power fitting can be calculated according to the thermal time constant, the steady-state temperature rise value, the mass and the specific heat capacity of the electric power fitting. Therefore, the online monitoring method for the electric power fitting power provided by the embodiment of the invention can realize online monitoring of the electric power fitting power consumption in the power grid system, and in addition, the monitoring method can be used for not only a direct current transmission and distribution line, but also an alternating current transmission and distribution line, thereby expanding the application range of the monitoring method.
Compared with the prior art that the hardware with smaller internal resistance needs measuring equipment with higher precision, the online monitoring method for the power of the electric power fitting provided by the embodiment of the invention does not need measuring equipment with higher precision to measure the voltages at two ends of the electric power fitting, and reduces the monitoring cost for monitoring the power of the electric power fitting.
According to the method for monitoring the power of the electric power fitting provided by the embodiment of the invention, the formula (2) can be obtained through calculation in the following calculation process. Specifically, for the electric power fittings in the power grid system, the current work and the temperature rise of the electric power fittings have the following relations:
Welectric current＝QHardware and temperature rise+QHardware fitting for heat dissipationFormula (3)
Wherein, WElectric currentRepresenting heat of current work, QHardware and temperature riseRepresenting the heat absorbed by the hardware at elevated temperature, QHardware fitting for heat dissipationThe heat emitted by the electric power fitting is expressed.
Through the newton heat dissipation formula, formula (3) can be converted into formula (4) after differentiation:
Pdt＝mcdτ+KTa τ dt formula (4)
Wherein Pdt represents the total heat productivity of the electric power fitting in dt time, KTA τ dt represents the total heat dissipated during dt, mcd τ represents the amount of heat absorbed during dt as the power fitting temperature increases d τ, KTAnd (4) representing the comprehensive heat dissipation coefficient, wherein A represents the external surface area of the electric power fitting.
Assuming that the power P is a constant value and does not change with the change of time, after integrating the formula (4), a characteristic equation of the temperature rise and the time of the electric power fitting can be obtained, and the characteristic equation is expressed by the formula (5):
however, in practical applications, the power P is not a constant value, and therefore, the time-varying correction factor of the power is increased in formula (5)
Obtaining a new characteristic equation of temperature rise and time
When the power fitting reaches the steady-state temperature, equation (5) may be approximated as
The thermal time constant can be adopted
The power calculation formula of the electric power fitting of the formula (2) can be obtained by combining the above formulas
In an embodiment, taking an aluminum alloy electric power fitting as an example, the power of the electric power fitting is calculated by using the monitoring method for the power of the electric power fitting. Specifically, the first hardware fitting and the second hardware fitting made of aluminum alloy materials can be selected, the surface temperatures of the first hardware fitting and the second hardware fitting are obtained in real time, a temperature rise-time curve of the first hardware fitting and the second hardware fitting is obtained, and as shown in fig. 2, a temperature rise equation of the first hardware fitting can be obtained through fitting according to the formula (1)
And temperature rise equation of second hardware fitting
The effect of fitting the fitting formula is evaluated by the pearson coefficient, and generally, the closer the pearson coefficient is to 1, the better the effect is. The Pearson coefficient r of the first hardware fitting is 1 through calculation; the Pearson coefficient r of the second hardware fitting is 1; therefore, the fitting effect of the first hardware fitting and the second hardware fitting is good.
The thermal time constants and the steady-state temperature rise values of the first hardware and the second hardware can be obtained through a fitting formula of the first hardware and the second hardware, and the specific heat capacities c of the first hardware and the second hardware, namely 896J (kg K), can be obtained through table look-up－1Mass m is 0.274kg, finally passing through the formula
And
and calculating to obtain that the power of the first hardware is 5.2W and the power of the second hardware is 5.2W.
An embodiment of the present invention further provides an online monitoring system for power fitting power, as shown in fig. 3, the monitoring system includes: the temperature acquisition device 1 is used for acquiring the surface temperature of the electric power fitting 10; the microprocessor 2 is connected with the temperature acquisition device 1 and is used for fitting and calculating the surface temperature of the electric power fitting to obtain a thermal time constant and a steady-state temperature rise value; and calculating the power value consumed by the electric power fitting according to the thermal time constant, the steady-state temperature rise value, the mass and the specific heat capacity.
According to the on-line monitoring system for the power of the electric power fitting, provided by the embodiment of the invention, the surface temperature of the electric power fitting is collected in real time through the temperature collecting device, and the power of the electric power fitting can be calculated according to the thermal time constant, the steady-state temperature rise value, the mass and the specific heat capacity of the electric power fitting. Therefore, the online monitoring system for the electric power fitting power provided by the embodiment of the invention can realize online monitoring of the electric power fitting power consumption in the power grid system, and in addition, the monitoring system can be used for not only a direct current transmission and distribution line, but also an alternating current transmission and distribution line, so that the application range of the monitoring method is expanded.
In a power system, important equipment such as a high-voltage switch cabinet, a bus connector, an outdoor disconnecting link switch and the like of a transformer substation and a power plant generate heat due to aging or overlarge contact resistance of parts such as electric shock and bus connection of the switch in the long-term operation process, and if the temperature of the heat-generating parts cannot be monitored in real time, fire and large-area power failure accidents can be caused finally. Therefore, in order to solve the problem of overheating during the operation of the equipment, a temperature monitoring device is generally arranged in the power system. The monitoring system for the power fitting power provided by the embodiment of the invention can obtain the surface temperature of the fitting by means of the temperature monitoring equipment in the power system without additionally arranging a temperature acquisition device, so that the monitoring cost can be further reduced compared with the existing monitoring method by the on-line monitoring system for the power fitting power provided by the embodiment of the invention.
As an alternative implementation manner of the embodiment of the present invention, as shown in fig. 3, the temperature acquisition device 1 is a wireless passive temperature acquisition device. Optionally, the temperature acquisition device 1 comprises: the temperature control system comprises a surface acoustic wave sensor 11, a temperature collector 12 and a temperature main control terminal 13, wherein the surface acoustic wave sensor 11 is connected with the power fitting 10, the surface acoustic wave sensor 11 senses a surface temperature signal of the power fitting 10 according to a first pulse signal sent by the temperature collector 12, converts the temperature signal into a second pulse signal and sends the second pulse signal to the temperature collector 12; the temperature collector 12 generates a surface temperature signal of the electric power fitting 10 according to the second pulse signal, and sends the temperature signal to the temperature main control terminal 13 for storage.
Specifically, the surface acoustic wave sensor 11 includes an interdigital transducer and a piezoelectric medium, the interdigital transducer is adhered to the upper surface of the piezoelectric medium, the temperature collector 12 emits a radio frequency pulse signal to the surface acoustic wave sensor 11, the frequency of the radio frequency pulse signal is the same as the preset frequency of the surface acoustic wave sensor 11, after the pulse signal is received by the piezoelectric medium of the surface acoustic wave sensor 11, the interdigital transducer activates a surface wave, the frequency of which changes along with the change of the temperature of the surface acoustic wave sensor 11, on the surface of the piezoelectric medium, the surface acoustic wave transducer converts the frequency oscillation of the surface acoustic wave into a radio frequency pulse signal, the converted radio frequency pulse signal is reflected to the temperature collector 12 through the piezoelectric medium of the surface acoustic wave sensor 11, the temperature collector 12 analyzes the reflected radio frequency pulse signal into temperature information and then sends the temperature information to the temperature main control, the temperature main control terminal 13 stores the received temperature information.
Alternatively, the saw sensor 11 may be of a tuning fork type, a bundle type, or a ring type; the acoustic surface wave sensors 11 can be multiple and are respectively connected with the tested electric power fitting; and data interaction is carried out among the surface acoustic wave sensor 11, the temperature collector 12 and the temperature main control terminal 13 in a wireless communication mode.
According to the on-line monitoring system for the power fitting power, the wireless passive temperature acquisition device is used as the temperature acquisition device, the passive induction mode is adopted for acquiring the temperature during temperature acquisition, battery driving is not needed, the maintenance cost caused by battery replacement is reduced, meanwhile, the ecological environment is not affected, and the surface acoustic wave sensor and the temperature acquisition device realize signal transmission in a wireless signal transmission mode, so that high-voltage isolation is realized and the safe operation of equipment is guaranteed.
An embodiment of the present invention further provides an online monitoring terminal for power fitting power, as shown in fig. 4, the online monitoring terminal for power fitting power may include a processor 51 and a memory 52, where the processor 51 and the memory 52 may be connected by a bus or in another manner, and fig. 4 takes the connection through the bus as an example.
The processor 51 may be a Central Processing Unit (CPU). The Processor 51 may also be other general purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components, or combinations thereof.
The memory 52, which is a non-transitory computer readable storage medium, may be used to store non-transitory software programs, non-transitory computer executable programs, and modules. The processor 51 executes various functional applications and data processing of the processor by running the non-transitory software programs, instructions and modules stored in the memory 52, that is, implements the method for monitoring the power hardware power in the above method embodiment.
The memory 52 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created by the processor 51, and the like. Further, the memory 52 may include high speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, the memory 52 may optionally include memory located remotely from the processor 51, and these remote memories may be connected to the processor 51 via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The one or more modules are stored in the memory 52, and when executed by the processor 51, perform an online monitoring method of power hardware power as in the embodiment shown in fig. 1.
The specific details of the foregoing power hardware power monitoring terminal may be understood with reference to the corresponding related description and effects in the embodiment shown in fig. 1, and are not described herein again.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a Flash Memory (Flash Memory), a Hard Disk (Hard Disk Drive, abbreviated as HDD) or a Solid State Drive (SSD), etc.; the storage medium may also comprise a combination of memories of the kind described above.
Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.
Claims (8)
1. An online monitoring method for power fitting power is characterized by comprising the following steps:
acquiring the surface temperature, the mass and the specific heat capacity of the electric power fitting;
fitting and calculating according to the surface temperature of the electric power fitting to obtain a thermal time constant and a steady-state temperature rise value;
and calculating the power value consumed by the electric power fitting according to the thermal time constant, the steady-state temperature rise value, the mass and the specific heat capacity.
2. The method according to claim 1, wherein the thermal time constant and the steady-state temperature rise value of the power fitting are obtained by fitting and calculating the following formulas:
wherein tau represents the surface temperature rise of the electric power fitting, and tauwRepresents a steady-state temperature rise value of the electric power fitting, T represents time, T represents a thermal time constant,
representing the correction factor of the power over time.
3. The method according to claim 2, wherein the power value consumed by the electric power fitting is calculated by the following formula:
wherein c represents the specific heat capacity of the electric power fitting, and m represents the mass of the electric power fitting.
4. An on-line monitoring system for electric power fitting power is characterized by comprising:
the temperature acquisition device is used for acquiring the surface temperature of the electric power fitting;
the microprocessor is connected with the temperature acquisition device and is used for fitting and calculating the surface temperature of the electric power fitting to obtain a thermal time constant and a steady-state temperature rise value; and calculating the power value consumed by the electric power fitting according to the thermal time constant, the steady-state temperature rise value, the mass and the specific heat capacity.
5. The on-line power fitting power monitoring system of claim 4, wherein the temperature acquisition device is a wireless passive temperature acquisition device.
6. The on-line monitoring system for power fitting power of claim 5, wherein the temperature acquisition device comprises: a surface acoustic wave sensor, a temperature collector and a temperature master control terminal,
the surface acoustic wave sensor is connected with the electric power fitting, senses a surface temperature signal of the electric power fitting according to a first pulse signal sent by the temperature collector, converts the temperature signal into a second pulse signal and sends the second pulse signal to the temperature collector;
and the temperature collector generates a surface temperature signal of the electric power fitting according to the second pulse signal, and sends the temperature signal to the temperature main control terminal for storage.
7. The on-line monitoring system for power fitting power of claim 6, wherein the surface acoustic wave sensor, the temperature collector and the temperature main control terminal perform data interaction in a wireless communication manner.
8. A computer-readable storage medium storing computer instructions for causing a computer to execute the online power hardware power monitoring method according to any one of claims 1 to 3.
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Application publication date: 20200331 |