CN112484883A - System and method for evaluating thermal state of contact net and bare conductor of substation - Google Patents
System and method for evaluating thermal state of contact net and bare conductor of substation Download PDFInfo
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- 230000007613 environmental effect Effects 0.000 claims description 21
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Abstract
The invention discloses a contact network and substation bare conductor thermal state evaluation system and method. The sunlight sensor, the wind sensor and the environment temperature sensor are used for acquiring the altitude, the real-time temperature, the real-time wind power, the real-time sunlight intensity and the current carrying capacity of the installation place of the bare conductor to determine the theoretical temperature of the bare conductor, the contact resistance change value of the current position of the bare conductor can be automatically measured and calculated, the overheating hidden danger of the bare conductor is timely found and an alarm is given out.
Description
Technical Field
The invention relates to the technical field of power system state evaluation, in particular to a system and a method for evaluating the thermal state of a contact network and a bare conductor of a substation.
Background
The railway contact net and the substation are widely applied to bare conductors, such as a contact net copper wire material, a contact net steel-cored aluminum strand material, and a flexible bus in the substation is also made of the steel-cored aluminum strand material. In the daily tour and the maintenance work of contact net and electric substation, it is an important work to discover in time that the bare conductor is overheated and handle, and the bare conductor is continuously generated heat and can cause strand breaking, strand loosing, threatens railway transportation safety. At present, aiming at thermal monitoring of a bare conductor, an infrared thermometer or an online monitoring system is mainly used, the two monitoring methods can only judge whether the thermal state of the bare conductor is in a normal range by analyzing the temperature, but the increase of the contact resistance is the root cause on the problem of abnormal additional temperature rise when the bare conductor operates, the online temperature monitoring system has great limitation, for example, a certain contact resistance exists at the contact part of a certain bare conductor, the temperature rise can reach the alarm value of the online temperature monitoring system in summer, but in autumn and winter, the temperature collected by the online temperature monitoring system can be lower than the alarm value due to low external environment temperature, weak sunshine intensity and weak wind power, and the condition is the defect that the temperature monitoring is used as the thermal state judgment reference of the bare conductor.
Disclosure of Invention
The invention aims to provide a contact network and a bare conductor thermal state evaluation system and method of a substation, the system and method utilize a sunlight sensor, a wind sensor and an environment temperature sensor to collect the altitude of a bare conductor installation site, real-time temperature, real-time wind power, real-time sunlight intensity and current carrying capacity to determine the theoretical temperature of the bare conductor, when a temperature on-line monitoring system or an intelligent inspection robot, an artificial heat patrol and the like collects the current heat patrol temperature of the bare conductor, the contact network and the bare conductor thermal state evaluation system of the substation can automatically measure and calculate the contact resistance change value of the current position of the bare conductor according to the actual difference value of the theoretical temperature and the heat patrol temperature, find the overheating hidden danger of the bare conductor in time and send an alarm, namely the system uses the contact resistance change of the bare conductor as a judgment reference, in any season and any objective external environment, the system can accurately capture the abnormal heat state of the bare conductor, and can solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides a contact net and naked conductor thermal state evaluation system of electric substation, includes naked conductor working method setting module, naked conductor environmental condition sampling module, naked conductor sampling module, database, starts calculation module, comparison and discernment and reports an emergency and asks for help or increased vigilance the module, wherein:
the bare conductor working mode setting module is used for setting the basic conditions of the bare conductor which needs to be subjected to thermal evaluation for the contact network and the power transformation;
the bare conductor environmental condition sampling module is used for setting natural environmental conditions borne by a contact network and a bare conductor which needs to be subjected to thermal evaluation for power transformation;
the bare conductor sampling module is used for acquiring data of the substation through a programmable asynchronous RS232 interface of the substation;
the database comprises a bare conductor model and weight data table, a bare conductor model and specific heat capacity data table, a comprehensive correction coefficient data table of the bare conductor at different altitudes and ambient temperatures, a temperature rise calculation data table of the bare conductor at different temperatures, wind speeds and sunlight intensities, and a long-term allowable current carrying value and normal maximum allowable temperature data table of the bare conductor;
the starting calculation module comprises a bare conductor no-load working temperature calculation algorithm, a bare conductor theoretical temperature calculation algorithm and a contact resistance calculation algorithm;
the comparison and identification alarm module is used for importing the theoretical temperature of the bare conductor in the database, the normal maximum allowable temperature of the bare conductor and the contact resistance of the bare conductor in the database.
Further, the bare conductor working mode setting module sets options including adding a new bare conductor, a name of the bare conductor, a model number of the bare conductor, and a length of the bare conductor.
Furthermore, the name of the bare conductor can enable inspection personnel to accurately search the position, the model of the bare conductor can enable the evaluation system to confirm the material and specific heat capacity from the database, and the model and the length of the bare conductor can enable the evaluation system to confirm the weight from the database.
Further, the bare conductor environmental condition sampling module sets an option to a bare conductor geographical location.
Furthermore, the altitude and the collected real-time temperature of the county and the district-level administrative district to which the geographic position of the bare conductor belongs can enable an evaluation system to confirm comprehensive correction coefficients of the current-carrying capacity of the bare conductor under different altitudes and ambient temperatures from a database.
Furthermore, the bare conductor environmental condition sampling module is also connected with a sunlight sensor, a wind sensor and an environmental temperature sensor outside the substation.
Further, bare conductor sampling module includes bare conductor current-carrying value sampling module and bare conductor heat patrols value sampling module, wherein:
the bare conductor current-carrying value sampling module is communicated with a communication processing device of the substation through a programmable asynchronous RS232 interface of the substation, collects the primary current values of a bus and a feed-out current transformer of the substation in real time, and the options are as follows: the current transformer is associated with the bare conductor;
the bare conductor thermal patrol value sampling module is connected with an on-line temperature monitoring system of a substation or an intelligent robot patrol system for data through a programmable asynchronous RS232 interface of the substation, collects thermal patrol temperature values in real time, and has options: and (4) manual input.
The other technical scheme to be solved by the invention is as follows: a method for evaluating the thermal state of a contact net and a bare conductor of a substation comprises the following steps:
step 1: the name of the bare conductor can enable a patrol worker to accurately search the position, the model of the bare conductor can enable an evaluation system to confirm the material and specific heat capacity from a database, and the model and the length of the bare conductor can enable the evaluation system to confirm the weight from the database;
step 2: the bare conductor environmental condition sampling module automatically reads the altitude of a county or district administrative district to which the geographical position belongs through the Internet after the geographical position is set by an operator, and the sampling module automatically acquires the real-time temperature, the real-time wind power and the real-time sunlight intensity of a measuring and calculating point through an outdoor sensor;
and step 3: the method comprises the steps that a current transformer and a bare conductor are associated, each section of named bare conductor can be respectively in communication association with a substation bus and a current transformer of a feed-out line, after association, the current carrying value of the bare conductor is the primary current value of a certain current transformer of a set substation bus or a feed-out line, a sampling module collects the primary current value of the current transformer from a substation communication processing device through an asynchronous RS232 interface, name conversion is carried out through association with the bare conductor, and then the current carrying value of each section of the bare conductor is stored in a database in real time;
and 4, step 4: when the contact network and the bare conductor thermal state evaluation system of the substation are not in data connection with the temperature online monitoring system or the intelligent robot inspection system, an operator can manually input a thermal inspection temperature value;
and 5: storing the real-time current carrying value of the bare conductor into a data table, storing the theoretical temperature of the bare conductor into the data table, storing the thermal patrol temperature of the bare conductor into the data table, and storing the contact resistance of the bare conductor into the data table;
step 6: calculating the no-load working temperature of the bare conductor, calculating the theoretical temperature of the bare conductor and calculating the contact resistance;
and 7: the theoretical temperature of the bare conductor and the normal maximum allowable temperature of the bare conductor which are led into the database by the comparing and identifying alarm module are compared, when the theoretical temperature of the bare conductor exceeds the normal maximum allowable temperature of the bare conductor, the evaluation system sends alarm information, the contact resistance of the bare conductor which is led into the database by the comparing and identifying alarm module is compared with a set threshold, and when the contact resistance of the bare conductor exceeds the set threshold, the evaluation system sends the alarm information.
Compared with the prior art, the invention has the beneficial effects that:
the invention relates to a contact net and a system and a method for evaluating the thermal state of a bare conductor of a substation, wherein the system and the method utilize a sunlight sensor, a wind sensor and an environment temperature sensor to acquire the altitude, the real-time temperature, the real-time wind power, the real-time sunlight intensity and the current carrying capacity of the installation site of the bare conductor to determine the theoretical temperature of the bare conductor, after the temperature on-line monitoring system or the intelligent inspection robot, the artificial heat inspection and the like collect the current heat inspection temperature of the bare conductor, the thermal state evaluation system of the bare conductor of the contact network and the substation can automatically measure and calculate the contact resistance change value of the current position of the bare conductor according to the actual difference between the theoretical temperature and the thermal patrol temperature, find the hidden danger of overheating of the bare conductor in time and send an alarm, the system uses the contact resistance change of the bare conductor as a judgment reference, and can accurately capture the abnormal heat state of the bare conductor in any season and any objective external environment.
Drawings
FIG. 1 is a structural diagram of a thermal state evaluation system for a contact network and a bare conductor of a substation according to the present invention;
fig. 2 is a block diagram of a bare conductor sampling module according to the present invention.
In the figure: 100. a bare conductor working mode setting module; 200. a bare conductor environmental condition sampling module; 300. a bare conductor sampling module; 301. a bare conductor current carrying value sampling module; 302. a bare conductor thermal patrol sampling module; 400. a database; 500. starting a calculation module; 600. comparing and identifying the alarm module;
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a contact network and bare conductor thermal state evaluation system of substation includes bare conductor working mode setting module 100, bare conductor environmental condition sampling module 200, bare conductor sampling module 300, database 400, start calculation module 500, comparison and recognition alarm module 600, wherein:
bare conductor working method setting module 100 is used for setting the contact net and the bare conductor basic conditions that the transformer needs to carry out thermal evaluation, and the options include: adding a new bare conductor, naming the bare conductor, the type of the bare conductor and the length of the bare conductor. The name of the bare conductor can enable inspection personnel to accurately search the position, the model of the bare conductor can enable the evaluation system to confirm the material and specific heat capacity from the database 400, and the model and the length of the bare conductor can enable the evaluation system to confirm the weight from the database 400.
The bare conductor environmental condition sampling module 200 is used for setting the natural environmental conditions borne by the contact network and the bare conductor which needs to be subjected to thermal evaluation for power transformation. The options are: a geographic location. After an operator sets a geographical position, the bare conductor environmental condition sampling module 200 automatically reads the altitude of a county or a district administrative district to which the geographical position belongs through the internet, and the bare conductor environmental condition sampling module 200 is connected through an outdoor sunlight sensor, a wind sensor and an ambient temperature sensor to automatically collect the real-time temperature, the real-time wind power and the real-time sunlight intensity of a measuring and calculating point.
The altitude and the collected real-time temperature of the county and the district-level administrative district to which the geographic position of the bare conductor belongs can enable the evaluation system to confirm comprehensive correction coefficients of the current-carrying capacity of the bare conductor under different altitudes and ambient temperatures from the database 400. The real-time temperature, real-time wind power and real-time solar intensity of the bare conductor enable the evaluation system to determine temperature rise values of the bare conductor when the bare conductor is at different temperatures, wind speeds and solar intensities and when the bare conductor is no-load and no-current from the database 400.
Referring to fig. 2, the bare conductor sampling module 300 is used to collect data of the substation through the programmable asynchronous RS232 interface of the substation. Bare conductor sampling module 300 includes bare conductor current-carrying value sampling module 301 and bare conductor thermal cruise sampling module 302, wherein:
bare conductor current-carrying value sampling module 301 carries out communication transmission with the communication processing apparatus of electric substation through the programmable asynchronous RS232 interface of electric substation, gathers electric substation bus, the present line current transformer primary current value of being qualified for the next round of competitions in real time, and the option is: a current transformer is associated with the bare conductor.
The current transformer and the bare conductor are associated, each section of named bare conductor can be respectively in communication association with a substation bus and a current transformer of a feed-out line, and after association, the current carrying value of the bare conductor is the primary current value of a certain current transformer of the set substation bus or the feed-out line. The sampling module collects a primary current value of the current transformer from the substation communication processing device through the asynchronous RS232 interface, name conversion is carried out through association with the bare conductor, and then the current carrying value of each section of the bare conductor is stored in the database 400 in real time.
Naked conductor is hot patrols value sampling module 302 through the asynchronous RS232 interface that the electric substation is programmable, and with electric substation temperature on-line monitoring system or intelligent robot system of patrolling and examining carry out data connection, the real-time collection is hot to be patrolled temperature value, and naked conductor is hot to be patrolled value sampling module 302 and has the option: and (4) manual input.
When the contact network and the bare conductor thermal state evaluation system of the substation are not in data connection with the temperature online monitoring system or the intelligent robot inspection system, an operator can manually input a thermal inspection temperature value.
The database 400 comprises a bare conductor model and weight data table, a bare conductor model and specific heat capacity data table, a comprehensive correction coefficient data table of the bare conductor at different altitudes and ambient temperatures, a temperature rise calculation data table of the bare conductor at different temperatures, wind speeds and sunlight intensities, and a long-term allowable current carrying value and normal maximum allowable temperature data table of the bare conductor.
The start calculation module 500 includes a bare conductor no-load working temperature calculation algorithm, a bare conductor theoretical temperature calculation algorithm, and a contact resistance calculation algorithm.
The comparison and identification alarm module 600 is used for importing the theoretical temperature of the bare conductor in the database 400, the normal maximum allowable temperature of the bare conductor and the contact resistance of the bare conductor in the database 400.
In order to better show the flow of evaluating the thermal state of the contact network and the bare conductor of the substation, the embodiment provides a method for evaluating the thermal state of the contact network and the bare conductor of the substation, which includes the following steps:
step 1: the name of the bare conductor can enable a patrol inspector to accurately search the position, the model of the bare conductor can enable an evaluation system to confirm the material and specific heat capacity from the database 400, and the model and the length of the bare conductor can enable the evaluation system to confirm the weight from the database 400;
step 2: after an operator sets a geographical position, the bare conductor environmental condition sampling module 200 automatically reads the altitude of a county or district administrative district to which the geographical position belongs through the internet, and the sampling module automatically acquires the real-time temperature, real-time wind power and real-time sunlight intensity of a measuring and calculating point through an outdoor sensor;
the altitude and the real-time temperature of the county, the district-level administrative district to which the geographic position of the bare conductor belongs can enable the evaluation system to confirm the comprehensive correction coefficient of the current-carrying capacity of the bare conductor under different altitudes and ambient temperatures from the database 400.
The real-time temperature, real-time wind power and real-time sunlight intensity of the bare conductor can enable the evaluation system to confirm temperature rise values of different temperatures, wind speeds and sunlight intensities and bare conductor no-load no-current conditions from the database 400.
And step 3: the current transformer and the bare conductor are associated, each section of named bare conductor can be respectively in communication association with a substation bus and a current transformer of a feed-out line, after association, the current carrying value of the bare conductor is the primary current value of a certain current transformer of a set substation bus or a feed-out line, the sampling module collects the primary current value of the current transformer from a substation communication processing device through an asynchronous RS232 interface, name conversion is carried out through association with the bare conductor, and then the current carrying value of each section of bare conductor is stored in the database 400 in real time;
and 4, step 4: when the contact network and the bare conductor thermal state evaluation system of the substation are not in data connection with the temperature online monitoring system or the intelligent robot inspection system, an operator can manually input a thermal inspection temperature value;
and 5: storing the real-time current carrying value of the bare conductor into a data table, storing the theoretical temperature of the bare conductor into the data table, storing the thermal patrol temperature of the bare conductor into the data table, and storing the contact resistance of the bare conductor into the data table;
step 6: calculating the no-load working temperature of the bare conductor, calculating the theoretical temperature of the bare conductor and calculating the contact resistance;
and (3) calculating the no-load working temperature of the bare conductor, wherein a formula theta 0 is theta y + theta z, in the formula, theta 0 is the no-load working temperature of the bare conductor, theta y is the real-time temperature of the natural environment acquired by the bare conductor environment condition sampling module 200, and theta z is the temperature rise value of the bare conductor at the current air temperature, wind speed and sunlight intensity led in from the database 400.
Theoretical temperature calculation of bare conductor, formula θ F ═ θ 0+ (θ e- θ 0) (IF/IeK)2In the formula, θ F is a theoretical temperature of the bare conductor, θ 0 is an idle working temperature of the bare conductor, θ e is a normal maximum allowable temperature of the bare conductor led from the database 400, IF is a real-time current carrying value of the bare conductor led from the database 400, Ie is a long-term allowable current carrying value of the bare conductor led from the database 400, and K is a comprehensive correction coefficient of the bare conductor led from the database 400 at different altitudes and ambient temperatures. The bare conductor contact power calculated finally by starting the calculation module 500The bare contact resistances stored in the database 400 are stored in a data table.
Contact resistance calculation, initiated by the compare and identify alarm module 600, formula IG2Where IG is a real-time current carrying value of the bare conductor led from the database 400, R is a contact resistance value of the bare conductor and the fixed wire clamp, t is a power application time, and the default of the evaluation system is 1 second. C is the specific heat capacity of the material of the corresponding fixed wire clamp imported through the database 400 in the option of the comparison and recognition alarm module 600. m is the set quality of the fixed wire clamp in the options of the comparison and identification alarm module 600. θ E is the actual temperature of the thermal trip, and θ F is the theoretical calculated temperature imported from the database 400 in the comparison and recognition alarm module 600 option.
And 7: by comparing the theoretical temperature of the bare conductor and the normal maximum allowable temperature of the bare conductor, which are led into the database 400 by the comparing and identifying alarm module 600, and comparing the two values, when the theoretical temperature of the bare conductor exceeds the normal maximum allowable temperature of the bare conductor, the evaluation system sends out alarm information, and when the theoretical temperature of the bare conductor exceeds the normal maximum allowable temperature of the bare conductor, the comparing and identifying alarm module 600 leads the contact resistance of the bare conductor into the database 400, and compares the contact resistance with a set threshold, and when the contact resistance of the bare conductor exceeds the set threshold, the evaluation system sends out alarm information.
The invention relates to a contact net and a system and a method for evaluating the thermal state of a bare conductor of a substation, wherein the system and the method utilize a sunlight sensor, a wind sensor and an environment temperature sensor to acquire the altitude, the real-time temperature, the real-time wind power, the real-time sunlight intensity and the current carrying capacity of the installation site of the bare conductor to determine the theoretical temperature of the bare conductor, after the temperature on-line monitoring system or the intelligent inspection robot, the artificial heat inspection and the like collect the current heat inspection temperature of the bare conductor, the thermal state evaluation system of the bare conductor of the contact network and the substation can automatically measure and calculate the contact resistance change value of the current position of the bare conductor according to the actual difference between the theoretical temperature and the thermal patrol temperature, find the hidden danger of overheating of the bare conductor in time and send an alarm, the system uses the contact resistance change of the bare conductor as a judgment reference, and can accurately capture the abnormal heat state of the bare conductor in any season and any objective external environment.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.
Claims (8)
1. The utility model provides a contact net and bare conductor thermal state evaluation system of electric substation, its characterized in that, includes bare conductor working method setting module (100), bare conductor environmental condition sampling module (200), bare conductor sampling module (300), database (400), starts calculation module (500), compares and discerns alarm module (600), wherein:
the bare conductor working mode setting module (100) is used for setting the basic conditions of the bare conductor which needs to be subjected to thermal evaluation for the contact network and power transformation;
the bare conductor environmental condition sampling module (200) is used for setting natural environmental conditions borne by a contact network and a bare conductor which needs to be subjected to thermal evaluation for power transformation;
the bare conductor sampling module (300) is used for collecting data of the substation through a programmable asynchronous RS232 interface of the substation;
the database (400) comprises a bare conductor model and weight data table, a bare conductor model and specific heat capacity data table, a comprehensive correction coefficient data table of the bare conductor at different altitudes and ambient temperatures, a temperature rise calculation data table of the bare conductor at different temperatures, wind speeds and sunlight intensities, and a long-term allowable current carrying value and normal maximum allowable temperature data table of the bare conductor;
the starting calculation module (500) comprises a bare conductor no-load working temperature calculation algorithm, a bare conductor theoretical temperature calculation algorithm and a contact resistance calculation algorithm;
the comparison and identification alarm module (600) is used for leading the theoretical temperature of the bare conductor in the database (400), the normal maximum allowable temperature of the bare conductor and the contact resistance of the bare conductor in the database (400).
2. The contact network and substation bare conductor thermal state evaluation system of claim 1, wherein the bare conductor operating mode setting module (100) sets options including addition of a new bare conductor, name of the bare conductor, model number of the bare conductor, and length of the bare conductor.
3. The system for evaluating the thermal state of the bare conductor of the overhead line system and the substation according to claim 2, wherein the name of the bare conductor enables an inspector to accurately search the position, the model of the bare conductor enables the evaluation system to confirm the material and specific heat capacity from the database, and the model and the length of the bare conductor enable the evaluation system to confirm the weight from the database.
4. The overhead line system and the bare conductor thermal state evaluation system of the substation of claim 1, wherein the bare conductor environmental condition sampling module (200) sets the option to be the bare conductor geographical location.
5. The system for evaluating the thermal state of the bare conductor of the overhead contact system and the substation according to claim 4, wherein the elevation height and the collected real-time temperature of the county and the district administrative district to which the geographic position of the bare conductor belongs can enable the evaluation system to confirm the comprehensive correction coefficient of the current-carrying capacity of the bare conductor under different elevations and ambient temperatures from the database.
6. The system for evaluating the thermal state of the bare conductor of the overhead line system and the substation according to claim 1, wherein the bare conductor environmental condition sampling module (200) is further connected with a sunlight sensor, a wind sensor and an environmental temperature sensor outside the substation.
7. The system for evaluating the thermal state of the bare conductor of the overhead line system and the substation according to claim 1, wherein the bare conductor sampling module (300) comprises a bare conductor current carrying value sampling module (301) and a bare conductor thermal patrol value sampling module (302), wherein:
bare conductor current-carrying value sampling module (301) carries out communication transmission with the communication processing apparatus of electric substation through the programmable asynchronous RS232 interface of electric substation, gathers electric substation bus, the present line current transformer primary current value of being qualified for the next round of competitions in real time, and the option is: the current transformer is associated with the bare conductor;
naked conductor heat patrols value sampling module (302) and passes through the asynchronous RS232 interface that the electric substation is programmable, and patrol and examine the system with electric substation temperature on-line monitoring system or intelligent robot and carry out data connection, real-time collection heat and patrol and examine the temperature value, naked conductor heat patrols value sampling module and has the option: and (4) manual input.
8. The method for evaluating the thermal state of the bare conductor of the overhead line system and the substation according to any one of claims 1 to 7, is characterized by comprising the following steps:
step 1: the name of the bare conductor can enable a patrol worker to accurately search the position, the model of the bare conductor can enable an evaluation system to confirm the material and specific heat capacity from a database, and the model and the length of the bare conductor can enable the evaluation system to confirm the weight from the database;
step 2: after an operator sets a geographical position, the bare conductor environmental condition sampling module (200) automatically reads the altitude of a county or district administrative district to which the geographical position belongs through the Internet, and the sampling module automatically collects the real-time temperature, the real-time wind power and the real-time sunlight intensity of a measuring and calculating point through an outdoor sensor;
and step 3: the method comprises the steps that a current transformer and a bare conductor are associated, each section of named bare conductor is respectively in communication association with a substation bus and a current transformer of a feed-out line, after association, the current carrying value of the bare conductor is the primary current value of a certain current transformer of a set substation bus or a feed-out line, a sampling module collects the primary current value of the current transformer from a substation communication processing device through an asynchronous RS232 interface, name conversion is carried out through association with the bare conductor, and then the current carrying value of each section of the bare conductor is stored in a database in real time;
and 4, step 4: when the contact network and the bare conductor thermal state evaluation system of the substation are not in data connection with the temperature online monitoring system or the intelligent robot inspection system, an operator can manually input a thermal inspection temperature value;
and 5: storing the real-time current carrying value of the bare conductor into a data table, storing the theoretical temperature of the bare conductor into the data table, storing the thermal patrol temperature of the bare conductor into the data table, and storing the contact resistance of the bare conductor into the data table;
step 6: calculating the no-load working temperature of the bare conductor, calculating the theoretical temperature of the bare conductor and calculating the contact resistance;
and 7: by comparing the theoretical temperature of the bare conductor and the normal maximum allowable temperature of the bare conductor which are led into the database (400) by the comparison and identification alarm module (600) and comparing the two values, when the theoretical temperature of the bare conductor exceeds the normal maximum allowable temperature of the bare conductor, the evaluation system sends out alarm information, the contact resistance of the bare conductor which is led into the database (400) by the comparison and identification alarm module (600) is compared with a set threshold value, and when the contact resistance of the bare conductor exceeds the set threshold value, the evaluation system sends out alarm information.
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Application publication date: 20210312 |