CN117232683A - High-voltage switch cabinet contact temperature inversion method and system - Google Patents
High-voltage switch cabinet contact temperature inversion method and system Download PDFInfo
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Abstract
The invention discloses a method and a system for inverting the contact temperature of a high-voltage switch cabinet, wherein the method comprises the steps of measuring the resistance value of a plum blossom contact and measuring the temperature of each corresponding measuring point when different currents are fed into the switch cabinet, and the measuring points comprise a contact, an upper contact arm, a lower contact arm and the inner wall of the switch cabinet; based on the resistance value of the quincuncial contact and the temperature of each measuring point, constructing an inversion equation t 1j ＝k 2j t 2j +k 3j t 3j +k 4j t 4j +k r r; solving the inversion equation by adopting a least square method to obtain a coefficient k 2j 、k 3j 、k 4j 、k r Is a value of (2); for coefficient k 2j 、k 3j 、k 4j Interpolation processing is carried out to obtain a relational expression between the coefficient and the current I; based on the coefficient and the current I during operation of the switchgearCalculating the current contact temperature according to the relation expression; the invention can accurately realize real-time monitoring of the temperature of the contact without installing the temperature sensor on the contact for a long time.
Description
Technical Field
The invention relates to the technical field of switch cabinets, in particular to a high-voltage switch cabinet contact temperature inversion method and system.
Background
The temperature rise monitoring method of the high-voltage switch cabinet is an important technology in the field of power equipment, and is a necessary means for effectively evaluating the temperature rise problem possibly occurring in the long-time operation process of the high-voltage switch cabinet. High voltage switchgear is an indispensable device in power systems, mainly for controlling and distributing power. However, during long operation, heat is generated inside the apparatus due to the passage of electric current, resulting in an increase in temperature. If the temperature rises too quickly or too high, it can adversely affect the safe operation of the device and may even cause damage or accidents to the device. Therefore, it is very important to accurately evaluate and control the temperature rise of the high-voltage switch cabinet.
The contact is the component with the fastest temperature rise in the switch cabinet, and the main scheme for measuring the temperature rise of the contact is to directly install a temperature sensor on the contact. However, the contact connection is affected, and the loose plug connection of the contact is possibly caused; on the other hand, in the long-term operation process, the temperature sensor arranged on the contact is easy to damage, and the contact can be replaced only by cutting off power once damaged. The temperature sensor is arranged on the contact arm or the inner wall of the switch cabinet, so that the problem of difficult maintenance can be solved, but the contact arm temperature and the inner wall temperature of the switch cabinet cannot directly react to the contact temperature. Therefore, it is necessary to provide a temperature inversion method, which can obtain the contact temperature as accurately as possible without installing a temperature sensor on the contact.
In the related technology, in the surface temperature measurement method for the plum blossom contact thermal fault of the switch cabinet, which is proposed in the patent application document with the publication number of CN115541051A, a switch cabinet temperature fluid field simulation model is firstly established to determine a temperature measuring point, and then calculation is realized through an inversion method, but the proposed temperature fluid field calculation process is very complex, the finite element calculation needs to consume huge calculation resources, and the inversion method is finally trained based on a vector machine regression method, so that the simulation calculation result can be learned, but the field actual measurement working condition data is not involved, and the field use feasibility of the method needs to be further verified.
In a method for calculating the contact temperature of a switch of a solid insulation switch cabinet proposed in patent application publication number CN106777633a, indirect calculation of the contact temperature is achieved by establishing a functional relationship between multiple factors and the contact temperature, and the multiple factors include: the solid insulation thickness, the horizontal distance between the sensor and the contact, the temperature of the switch cabinet body and other factors. In which many factors such as insulation thickness, sensor position coordinates, etc. are related to the switchgear structure, such parameters do not change in real time, so the degree of freedom of the overall method is low.
Disclosure of Invention
The technical problem to be solved by the invention is how to accurately realize real-time monitoring of the temperature of the contact while not installing the temperature sensor on the contact.
The invention solves the technical problems by the following technical means:
in a first aspect, the invention provides a method for inverting the contact temperature of a high-voltage switch cabinet, which comprises the following steps:
measuring the resistance value of the quincuncial contact and the temperature of each corresponding measuring point when different currents are fed into the switch cabinet, wherein the measuring points comprise a contact, an upper contact arm, a lower contact arm and the inner wall of the switch cabinet;
based on the resistance value of the quincuncial contact and the temperature of each measuring point, constructing an inversion equation t 1j ＝k 2j t 2j +k 3j t 3j +k 4j t 4j +k r r, wherein t 1j For the contact temperatures corresponding to different currents, t 2j For the upper contact arm temperature, t corresponding to different currents 3j For the lower contact arm temperature, t corresponding to different currents 4j The temperature of the inner wall of the switch cabinet corresponding to different currents is r is the resistance value of the plum blossom contact, k 2j 、k 3j 、k 4j 、k r The coefficient j is the type of the current value;
solving the inversion equation by adopting a least square method to obtain a coefficient k 2j 、k 3j 、k 4j 、k r Is a value of (2);
for coefficient k 2j 、k 3j 、k 4j Interpolation processing is carried out to obtain a coefficient k 2j 、k 3j 、k 4j A relation with the current I;
based on the coefficient k when the switchgear is in operation 2j 、k 3j 、k 4j And calculating the current contact temperature according to a relation between the current I and the current I.
Further, the measuring the temperature of each corresponding measuring point when the switch cabinet is electrified with different currents comprises:
the method comprises the steps of introducing currents with different values into a switch cabinet, and respectively measuring the temperature of an upper contact, the temperature of a lower contact arm and the temperature of the inner wall of the switch cabinet by using temperature sensors arranged on the upper contact, the lower contact, the upper contact arm and the inner wall of the switch cabinet;
and taking the average value of the upper contact temperature and the lower contact temperature as the contact temperature to obtain the corresponding contact temperature, upper contact arm temperature, lower contact arm temperature and switch cabinet inner wall temperature when different currents are fed into the switch cabinet.
Further, the pair coefficient k 2j 、k 3j 、k 4j Interpolation processing is carried out to obtain a coefficient k 2j 、k 3j 、k 4j A relation to current I comprising:
using spline interpolation for the coefficient k 2j 、k 3j 、k 4j Interpolation processing is carried out to obtain a coefficient k 2j 、k 3j 、k 4j The relation with the current I is:
k 2 ＝f 2 (I)
k 3 ＝f 3 (I)
k 4 ＝f 4 (I)
wherein k is 2 Is the temperature component coefficient, k of the contact 3 Upper contact arm temperature component coefficient, k 4 For the lower contact arm temperature component coefficient, f 2 (I) As a function of the contact temperature component, f 3 (I) As a function of the upper contact arm temperature component, f 4 (I) As a function of the down-arm temperature component.
Further, the operation of the switch cabinet is based on the coefficient k 2j 、k 3j 、k 4j And the relation between the current I and the current I is calculated, wherein the method comprises the following steps of:
at any moment of operation of the switch cabinet, acquiring current I fed into the switch cabinet at the current moment 0 ；
Measuring the temperature T of the lower upper contact arm at the current moment by using temperature sensors arranged on the upper contact arm, the lower contact arm and the inner wall of the switch cabinet 2 Lower contact arm temperature T 3 Temperature T of inner wall of switch cabinet 4 ；
Based on the current I 0 Upper contact arm temperature T 2 Lower contact arm temperature T 3 Temperature T of inner wall of switch cabinet 4 Based on coefficient k 2j 、k 3j 、k 4j The relation between the current I and the current T is calculated inv The formula is:
T inv ＝f 2 (I 0 )T 2 +f 3 (I 0 )T 3 +f 4 (I 0 )T 4 +k r r
wherein f 2 (I 0 )、f 3 (I 0 ) And f 4 (I 0 ) The current is I respectively 0 Contact temperature, upper contact arm temperature and lower contact arm temperature component function values.
Further, before the quincuncial contact resistance value is measured and the temperature of each corresponding measuring point is measured when different currents are introduced into the switch cabinet, the method further comprises:
measuring the ambient temperature of the environment in which the switch cabinet is positioned by using a temperature sensor arranged outside the switch cabinet;
measuring the resistance value of the plum blossom contact when the steady-state temperature value is reached according to the ambient temperature, the upper contact temperature, the lower contact temperature, the upper contact arm temperature, the lower contact arm temperature and the inner wall temperature of the switch cabinet;
and when the steady-state temperature is reached, the temperature of each corresponding measuring point when different currents are fed into the measuring switch cabinet is obtained.
Further, the switch cabinet is externally covered with a foam layer.
In a second aspect, the invention provides a high-voltage switch cabinet contact temperature inversion system, which comprises:
the acquisition module is used for acquiring the resistance value of the plum blossom contact and the temperature of each corresponding measuring point when different currents are introduced into the switch cabinet, and the measuring points comprise a contact, an upper contact arm, a lower contact arm and the inner wall of the switch cabinet;
the inversion equation construction module is used for constructing an inversion equation t based on the resistance value of the quincuncial contact and the temperature of each measuring point 1j ＝k 2j t 2j +k 3j t 3j +k 4j t 4j +k r r, wherein t 1j For the contact temperatures corresponding to different currents, t 2j For the upper contact arm temperature, t corresponding to different currents 3j For the lower contact arm temperature, t corresponding to different currents 4j The temperature of the inner wall of the switch cabinet corresponding to different currents is r is the resistance value of the plum blossom contact, k 2j 、k 3j 、k 4j 、k r The coefficient j is the type of the current value;
an equation solving module for solving the inversion equation by using a least square method to obtain a coefficient k 2j 、k 3j 、k 4j 、k r Is a value of (2);
interpolation module for the coefficient k 2j 、k 3j 、k 4j Interpolation processing is carried out to obtain a coefficient k 2j 、k 3j 、k 4j A relation with the current I;
the contact temperature calculation module is used for calculating the temperature of the contact based on the coefficient k when the switch cabinet operates 2j 、k 3j 、k 4j And calculating the current contact temperature according to a relation between the current I and the current I.
Further, the system also comprises a high-current generator for supplying different currents to the switch cabinet;
the acquisition module comprises:
the acquisition unit is used for introducing currents with different values to the switch cabinet by using the high-current generator and respectively measuring the temperature of the upper contact, the temperature of the lower contact and the temperature of the inner wall of the switch cabinet by using temperature sensors arranged on the upper contact, the lower contact, the upper contact arm and the inner wall of the switch cabinet;
and the temperature calculation unit is used for taking the average value of the upper contact temperature and the lower contact temperature as the contact temperature to obtain the corresponding contact temperature, upper contact arm temperature, lower contact arm temperature and switch cabinet inner wall temperature when different currents are fed into the switch cabinet.
Further, the interpolation module is used for interpolating the coefficient k by adopting a spline 2j 、k 3j 、k 4j Interpolation processing is carried out to obtain a coefficient k 2j 、k 3j 、k 4j The relation with the current I is:
k 2 ＝f 2 (I)
k 3 ＝f 3 (I)
k 4 ＝f 4 (I)
wherein k is 2 Is the temperature component coefficient, k of the contact 3 Upper contact arm temperature component coefficient, k 4 For the lower contact arm temperature component coefficient, f 2 (I) As a function of the contact temperature component, f 3 (I) As a function of the upper contact arm temperature component, f 4 (I) As a function of the down-arm temperature component.
Further, the contact temperature calculation module includes:
the current acquisition unit is used for acquiring the current I introduced by the switch cabinet at the current moment at any moment of the operation of the switch cabinet 0 ；
A temperature actual measurement unit for using the upper contact arm, the lower contact arm and the switch cabinetTemperature sensor on inner wall for measuring temperature T of upper contact arm at current moment 2 Lower contact arm temperature T 3 Temperature T of inner wall of switch cabinet 4 ；
A contact temperature calculation unit for calculating a contact temperature based on the current I 0 Upper contact arm temperature T 2 Lower contact arm temperature T 3 Temperature T of inner wall of switch cabinet 4 Based on coefficient k 2j 、k 3j 、k 4j The relation between the current I and the current T is calculated inv The formula is:
T inv ＝f 2 (I 0 )T 2 +f 3 (I 0 )T 3 +f 4 (I 0 )T 4 +k r r
wherein f 2 (I 0 )、f 3 (I 0 ) And f 4 (I 0 ) The current is I respectively 0 Contact temperature, upper contact arm temperature and lower contact arm temperature component function values.
The invention has the advantages that:
(1) According to the invention, the contact resistance of the contact and the temperature of each corresponding measuring point when different currents are fed into the switch cabinet are measured, an inversion equation is constructed, the inversion equation is solved, and after the switch cabinet is put into operation, the contact temperature is obtained through inversion calculation of the measurement results of the upper contact arm, the lower contact arm and the temperature sensors on the inner wall of the switch cabinet; the method is oriented to field application, can accurately realize real-time monitoring of the temperature of the contact without complex simulation numerical calculation while not installing a temperature sensor on the contact, and has very important significance for guaranteeing the safety and reliability of the switch cabinet; in addition, input parameters except the contact resistance can be changed in real time in the inversion process of the contact temperature, so that the method has extremely high degree of freedom and is simple to implement.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a schematic flow chart of a method for inverting the contact temperature of a high-voltage switch cabinet according to an embodiment of the invention;
fig. 2 is a schematic structural diagram of a high-voltage switch cabinet contact temperature inversion system according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions in the embodiments of the present invention will be clearly and completely described in the following in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, a first embodiment of the present invention proposes a method for inverting the contact temperature of a high-voltage switch cabinet, the method comprising the following steps:
s10, measuring resistance values of the quincuncial contacts and temperatures of corresponding measuring points when different currents are fed into the switch cabinet, wherein the measuring points comprise contacts, upper contact arms, lower contact arms and inner walls of the switch cabinet;
the resistance value of the plum blossom contact can be measured by adopting a resistance measuring instrument, and the temperature of each measuring point can be measured by adopting a temperature sensor.
S20, constructing an inversion equation t based on the resistance value of the quincuncial contact and the temperature of each measuring point 1j ＝k 2j t 2j +k 3j t 3j +k 4j t 4j +k r r, wherein t 1j For the contact temperatures corresponding to different currents, t 2j For the upper contact arm temperature, t corresponding to different currents 3j For the lower contact arm temperature, t corresponding to different currents 4j The temperature of the inner wall of the switch cabinet corresponding to different currents is r is the resistance value of the plum blossom contact, k 2j 、k 3j 、k 4j 、k r The coefficient j is the type of the current value;
in the operation of the switchgear, the tulip contacts may wear, soften, etc., which are all represented by changes in resistance, so that in this embodiment, the resistance values of the contacts are taken into consideration when inverting the contact temperature.
S30, solving the inversion equation by adopting a least square method to obtain a coefficient k 2j 、k 3j 、k 4j 、k r Is a value of (2);
s40, coefficient of pair k 2j 、k 3j 、k 4j Interpolation processing is carried out to obtain a coefficient k 2j 、k 3j 、k 4j A relation with the current I;
s50, when the switch cabinet operates, the control method is based on the coefficient k 2j 、k 3j 、k 4j And calculating the current contact temperature according to a relation between the current I and the current I.
The contact temperature inversion method provided by the embodiment is applied to the field, the real-time temperature field condition in the switch cabinet is obtained by arranging the temperature sensors at different positions in the switch cabinet, the contact temperature is inverted by the multipoint temperature measurement result, the real-time calculation of the contact temperature can be realized, the input parameters except the contact resistance can be changed in real time, the degree of freedom is extremely high, in addition, the implementation is simple, and the complex simulation numerical calculation is not needed.
In an embodiment, in step S10, measuring the temperatures of the corresponding measuring points when the switch cabinet is connected to different currents includes:
the method comprises the steps of introducing currents with different values into a switch cabinet, and respectively measuring the temperature of an upper contact, the temperature of a lower contact arm and the temperature of the inner wall of the switch cabinet by using temperature sensors arranged on the upper contact, the lower contact, the upper contact arm and the inner wall of the switch cabinet;
and taking the average value of the upper contact temperature and the lower contact temperature as the contact temperature to obtain the corresponding contact temperature, upper contact arm temperature, lower contact arm temperature and switch cabinet inner wall temperature when different currents are fed into the switch cabinet.
Specifically, the embodiment adopts a heavy current generator to generate heavy current and sequentially electrifies the switch cabinet provided with normal contacts and screwed down by the busbar screws, and the electrifies current I are 0 and 0.2I respectively N 、0.4I N 、0.6I N 、0.8I N 、I N And 1.1I N . After the temperature rise is stabilized, the steady-state temperature value is measured by all the temperature sensors. And taking an average value of temperatures measured by the upper contact and the lower contact sensors to obtain a contact temperature, and expressing the temperatures measured by the upper contact arm, the lower contact arm and the sensors at the inner wall of the switch cabinet by i, wherein i=1, 2,3 and 4. The temperatures measured by the different sensors when the through currents are different are respectively represented by j, j=1, 2,3,4,5,6 and 7, so that the measured temperatures of the sensors are respectively t ij 。
It should be understood that the energizing current used in this embodiment may be other values, and this embodiment is not particularly limited.
In one embodiment, in the step S20, an inversion equation is constructed as follows:
wherein t is 11 ～t 17 The contact temperature, t, corresponding to 7 different current values 21 ～t 27 The upper contact arm temperature, t, corresponding to 7 different current values 31 ～t 37 The lower contact arm temperature, t, corresponding to 7 different current values 41 ～t 47 The temperature k at the inner wall of the switch cabinet corresponding to 7 different current values 11 ～k 17 At t 11 ～t 17 Corresponding coefficient, k 21 ～k 27 At t 21 ～t 27 Corresponding coefficient, k 31 ～k 37 At t 31 ～t 37 Corresponding coefficient, k 41 ～k 47 At t 41 ～t 47 Corresponding coefficients.
In one embodiment, the step S40: for coefficient k 2j 、k 3j 、k 4j Interpolation processing is carried out to obtain a coefficient k 2j 、k 3j 、k 4j The relation between the current I and the current I is specifically:
using spline interpolation for the coefficient k 2j 、k 3j 、k 4j Interpolation processing is carried out to obtain a coefficient k 2j 、k 3j 、k 4j The relation with the current I is:
k 2 ＝f 2 (I)
k 3 ＝f 3 (I)
k 4 ＝f 4 (I)
wherein k is 2 Is the temperature component coefficient, k of the contact 3 Upper contact arm temperature component coefficient, k 4 For the lower contact arm temperature component coefficient, f 2 (I) As a function of the contact temperature component, f 3 (I) As a function of the upper contact arm temperature component, f 4 (I) As a function of the down-arm temperature component.
Specifically, k 2j ,k 3j ,k 4j (j=1, 2,3,4,5,6, 7) corresponds to the energizing currents I being 0, 0.2I, respectively N 、0.4I N 、0.6I N 、0.8I N 、I N And 1.1I N Coefficient at time, using spline interpolation to k 2j ,k 3j ,k 4j Interpolation processing is carried out, and k is obtained through solving 2 、k 3 And k 4 And the energizing current I.
In one embodiment, the step S50: based on the coefficient k when the switchgear is in operation 2j 、k 3j 、k 4j And calculating the current contact temperature according to a relation between the current I and the current I, wherein the method comprises the following steps of:
s51, at any moment of operation of the switch cabinet, acquiring current I fed by the switch cabinet at the current moment 0 ；
S52, measuring the temperature T of the lower upper contact arm at the current moment by using temperature sensors arranged on the upper contact arm, the lower contact arm and the inner wall of the switch cabinet 2 Lower contact arm temperature T 3 Temperature T of inner wall of switch cabinet 4 ；
S53, based on the current I 0 Upper contact arm temperature T 2 Lower contact arm temperature T 3 Temperature T of inner wall of switch cabinet 4 Based on coefficient k 2j 、k 3j 、k 4j The relation between the current I and the current T is calculated inv The formula is:
T inv ＝f 2 (I 0 )T 2 +f 3 (I 0 )T 3 +f 4 (I 0 )T 4 +k r r
wherein f 2 (I 0 )、f 3 (I 0 ) And f 4 (I 0 ) The current is I respectively 0 Contact temperature, upper contact arm temperature and lower contact arm temperature component function values.
When the switch cabinet is put into operation, the temperature sensors on the upper contact and the lower contact are removed, the temperature sensors on the upper contact arm, the lower contact arm and the inner wall of the switch cabinet are reserved, and at any moment of operation of the switch cabinet, the contact temperature can be inverted according to the temperature measured by the upper contact arm, the lower contact arm and the sensors on the inner wall of the switch cabinet and the current passing through the switch cabinet and the relation between the combination coefficient and the current.
In one embodiment, in the step S10: before measuring the resistance value of the quincuncial contact and the temperature of each corresponding measuring point when different currents are fed into the switch cabinet, the method further comprises the following steps:
measuring the ambient temperature of the environment in which the switch cabinet is positioned by using a temperature sensor arranged outside the switch cabinet;
measuring the resistance value of the plum blossom contact when the steady-state temperature value is reached according to the ambient temperature, the upper contact temperature, the lower contact temperature, the upper contact arm temperature, the lower contact arm temperature and the inner wall temperature of the switch cabinet;
and when the steady-state temperature is reached, the temperature of each corresponding measuring point when different currents are fed into the measuring switch cabinet is obtained.
It should be noted that, environmental temperature and the like have an influence on the temperature of the contact, and in the embodiment, after the stable temperature value is determined, the resistance value of the plum blossom contact is measured, and different currents are fed into the switch cabinet to be the temperatures of the corresponding measuring points, so that the accuracy of temperature inversion can be improved.
In one embodiment, the switchgear cabinet is covered with a foam layer.
In order to prevent heat loss, in this embodiment, a foam layer is added to the switch cabinet, and the foam layer is removed during actual operation.
As shown in fig. 2, a second embodiment of the present invention proposes a high voltage switchgear contact temperature inversion system, the system comprising:
the acquisition module 10 is used for acquiring the resistance value of the plum blossom contact and the temperature of each corresponding measuring point when different currents are introduced into the switch cabinet, wherein the measuring points comprise a contact, an upper contact arm, a lower contact arm and the inner wall of the switch cabinet;
an inversion equation construction module 20 for constructing an inversion equation t based on the quincuncial contact resistance value and the temperatures of the measuring points 1j ＝k 2j t 2j +k 3j t 3j +k 4j t 4j +k r r, wherein t 1j For the contact temperatures corresponding to different currents, t 2j For the upper contact arm temperature, t corresponding to different currents 3j For the lower contact arm temperature, t corresponding to different currents 4j The temperature of the inner wall of the switch cabinet corresponding to different currents is r is the resistance value of the plum blossom contact, k 2j 、k 3j 、k 4j 、k r The coefficient j is the type of the current value;
an equation solving module 30 for solving the inversion equation by using a least square method to obtain a coefficient k 2j 、k 3j 、k 4j 、k r Is a value of (2);
interpolation module 40 for applying a coefficient k to 2j 、k 3j 、k 4j Interpolation processing is carried out to obtain a coefficient k 2j 、k 3j 、k 4j A relation with the current I;
a contact temperature calculation module 50 for calculating a contact temperature based on a coefficient k when the switchgear is in operation 2j 、k 3j 、k 4j And calculating the current contact temperature according to a relation between the current I and the current I.
In an embodiment, the system further comprises a high current generator for supplying different currents to the switch cabinet;
the acquisition module 10 comprises:
the acquisition unit is used for introducing currents with different values to the switch cabinet by using the high-current generator and respectively measuring the temperature of the upper contact, the temperature of the lower contact and the temperature of the inner wall of the switch cabinet by using temperature sensors arranged on the upper contact, the lower contact, the upper contact arm and the inner wall of the switch cabinet;
and the temperature calculation unit is used for taking the average value of the upper contact temperature and the lower contact temperature as the contact temperature to obtain the corresponding contact temperature, upper contact arm temperature, lower contact arm temperature and switch cabinet inner wall temperature when different currents are fed into the switch cabinet.
In one embodiment, the interpolation module is used for interpolating the coefficient k by using a spline 2j 、k 3j 、k 4j Interpolation processing is carried out to obtain a coefficient k 2j 、k 3j 、k 4j The relation with the current I is:
k 2 ＝f 2 (I)
k 3 ＝f 3 (I)
k 4 ＝f 4 (I)
wherein k is 2 Is the temperature component coefficient, k of the contact 3 Upper contact arm temperature component coefficient, k 4 For the lower contact arm temperature component coefficient, f 2 (I) As a function of the contact temperature component, f 3 (I) As a function of the upper contact arm temperature component, f 4 (I) As a function of the down-arm temperature component.
In one embodiment, the contact temperature calculation module includes:
the current acquisition unit is used for acquiring the current I introduced by the switch cabinet at the current moment at any moment of the operation of the switch cabinet 0 ；
A temperature actual measurement unit for measuring the temperature T of the upper contact arm at the current moment by using temperature sensors arranged on the upper contact arm, the lower contact arm and the inner wall of the switch cabinet 2 Lower contact arm temperature T 3 Temperature T of inner wall of switch cabinet 4 ；
A contact temperature calculation unit for calculating a contact temperature based on the current I 0 Upper contact arm temperature T 2 Lower contact arm temperature T 3 Temperature T of inner wall of switch cabinet 4 Based on coefficient k 2j 、k 3j 、k 4j The relation between the current I and the current I is calculated to obtain the current contact temperatureDegree T inv The formula is:
T inv ＝f 2 (I 0 )T 2 +f 3 (I 0 )T 3 +f 4 (I 0 )T 4 +k r r
wherein f 2 (I 0 )、f 3 (I 0 ) And f 4 (I 0 ) The current is I respectively 0 Contact temperature, upper contact arm temperature and lower contact arm temperature component function values.
It should be noted that, other embodiments of the high-voltage switch cabinet contact temperature inversion system or the implementation method thereof can refer to the above method embodiments, and no redundant description is provided herein.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (10)
1. A method for inverting the contact temperature of a high-voltage switch cabinet, which is characterized by comprising the following steps:
measuring the resistance value of the quincuncial contact and the temperature of each corresponding measuring point when different currents are fed into the switch cabinet, wherein the measuring points comprise a contact, an upper contact arm, a lower contact arm and the inner wall of the switch cabinet;
based on the resistance value of the quincuncial contact and the temperature of each measuring point, constructing an inversion equation t 1j ＝k 2j t 2j +k 3j t 3j +k 4j t 4j +k r r, wherein t 1j For the contact temperatures corresponding to different currents, t 2j For the upper contact arm temperature, t corresponding to different currents 3j For the lower contact arm temperature, t corresponding to different currents 4j The temperature of the inner wall of the switch cabinet corresponding to different currents is r is the resistance value of the plum blossom contact, k 2j 、k 3j 、k 4j 、k r The coefficient j is the type of the current value;
solving the inversion equation by adopting a least square method to obtain a coefficient k 2j 、k 3j 、k 4j 、k r Is a value of (2);
for coefficient k 2j 、k 3j 、k 4j Interpolation processing is carried out to obtain a coefficient k 2j 、k 3j 、k 4j A relation with the current I;
based on the coefficient k when the switchgear is in operation 2j 、k 3j 、k 4j And calculating the current contact temperature according to a relation between the current I and the current I.
2. The method for inverting the contact temperature of the high-voltage switch cabinet according to claim 1, wherein the measuring the temperature of each corresponding measuring point when different currents are introduced into the switch cabinet comprises the following steps:
the method comprises the steps of introducing currents with different values into a switch cabinet, and respectively measuring the temperature of an upper contact, the temperature of a lower contact arm and the temperature of the inner wall of the switch cabinet by using temperature sensors arranged on the upper contact, the lower contact, the upper contact arm and the inner wall of the switch cabinet;
and taking the average value of the upper contact temperature and the lower contact temperature as the contact temperature to obtain the corresponding contact temperature, upper contact arm temperature, lower contact arm temperature and switch cabinet inner wall temperature when different currents are fed into the switch cabinet.
3. The method for temperature inversion of a high voltage switchgear enclosure contacts according to claim 1, wherein said pair of coefficients k 2j 、k 3j 、k 4j Interpolation processing is carried out to obtain a coefficient k 2j 、k 3j 、k 4j A relation to current I comprising:
using spline interpolation for the coefficient k 2j 、k 3j 、k 4j Interpolation processing is carried out to obtain a coefficient k 2j 、k 3j 、k 4j The relation with the current I is:
k 2 ＝f 2 (I)
k 3 ＝f 3 (I)
k 4 ＝f 4 (I)
wherein k is 2 Is the temperature component coefficient, k of the contact 3 Upper contact arm temperature component coefficient, k 4 For the lower contact arm temperature component coefficient, f 2 (I) As a function of the contact temperature component, f 3 (I) As a function of the upper contact arm temperature component, f 4 (I) As a function of the down-arm temperature component.
4. The method for reversing the contact temperature of a high-voltage switch cabinet according to claim 1, wherein the temperature is based on a coefficient k when the switch cabinet is operated 2j 、k 3j 、k 4j And the relation between the current I and the current I is calculated, wherein the method comprises the following steps of:
at any moment of operation of the switch cabinet, acquiring current I fed into the switch cabinet at the current moment 0 ；
Measuring the temperature T of the lower upper contact arm at the current moment by using temperature sensors arranged on the upper contact arm, the lower contact arm and the inner wall of the switch cabinet 2 Lower contact arm temperature T 3 Temperature T of inner wall of switch cabinet 4 ；
Based on the current I 0 Upper contact arm temperature T 2 Lower contact arm temperature T 3 Temperature T of inner wall of switch cabinet 4 Based on coefficient k 2j 、k 3j 、k 4j The relation between the current I and the current T is calculated inv The formula is:
T inv ＝f 2 (I 0 )T 2 +f 3 (I 0 )T 3 +f 4 (I 0 )T 4 +k r r
wherein f 2 (I 0 )、f 3 (I 0 ) And f 4 (I 0 ) The current is I respectively 0 Contact temperature, upper contact arm temperature and lower contact arm temperature component function values.
5. The method for inverting the contact temperature of a high-voltage switch cabinet according to claim 1, wherein before the measuring the resistance value of the tulip contact and the temperature of each corresponding measuring point when different currents are fed into the switch cabinet, the method further comprises:
measuring the ambient temperature of the environment in which the switch cabinet is positioned by using a temperature sensor arranged outside the switch cabinet;
measuring the resistance value of the plum blossom contact when the steady-state temperature value is reached according to the ambient temperature, the upper contact temperature, the lower contact temperature, the upper contact arm temperature, the lower contact arm temperature and the inner wall temperature of the switch cabinet;
and when the steady-state temperature is reached, the temperature of each corresponding measuring point when different currents are fed into the measuring switch cabinet is obtained.
6. The method of claim 1, wherein the switchgear enclosure is coated with a foam layer.
7. A high voltage switchgear contact temperature inversion system, the system comprising:
the acquisition module is used for acquiring the resistance value of the plum blossom contact and the temperature of each corresponding measuring point when different currents are introduced into the switch cabinet, and the measuring points comprise a contact, an upper contact arm, a lower contact arm and the inner wall of the switch cabinet;
the inversion equation construction module is used for constructing an inversion equation t based on the resistance value of the quincuncial contact and the temperature of each measuring point 1j ＝k 2j t 2j +k 3j t 3j +k 4j t 4j +k r r, wherein t 1j For the contact temperatures corresponding to different currents, t 2j For the upper contact arm temperature, t corresponding to different currents 3j For the lower contact arm temperature, t corresponding to different currents 4j The temperature of the inner wall of the switch cabinet corresponding to different currents is r is the resistance value of the plum blossom contact, k 2j 、k 3j 、k 4j 、k r The coefficient j is the type of the current value;
an equation solving module for solving the inversion equation by using a least square method to obtain a coefficient k 2j 、k 3j 、k 4j 、k r Is a value of (2);
interpolation module for the coefficient k 2j 、k 3j 、k 4j Interpolation processing is carried out to obtain a coefficient k 2j 、k 3j 、k 4j A relation with the current I;
the contact temperature calculation module is used for calculating the temperature of the contact based on the coefficient k when the switch cabinet operates 2j 、k 3j 、k 4j And calculating the current contact temperature according to a relation between the current I and the current I.
8. The high voltage switchgear contact temperature inversion system of claim 7 further comprising a high current generator for supplying different currents to the switchgear;
the acquisition module comprises:
the acquisition unit is used for introducing currents with different values to the switch cabinet by using the high-current generator and respectively measuring the temperature of the upper contact, the temperature of the lower contact and the temperature of the inner wall of the switch cabinet by using temperature sensors arranged on the upper contact, the lower contact, the upper contact arm and the inner wall of the switch cabinet;
and the temperature calculation unit is used for taking the average value of the upper contact temperature and the lower contact temperature as the contact temperature to obtain the corresponding contact temperature, upper contact arm temperature, lower contact arm temperature and switch cabinet inner wall temperature when different currents are fed into the switch cabinet.
9. The high voltage switchgear enclosure temperature inversion system according to claim 7, wherein said interpolation module is configured to interpolate a coefficient k using spline interpolation 2j 、k 3j 、k 4j Interpolation processing is carried out to obtain a coefficient k 2j 、k 3j 、k 4j The relation with the current I is:
k 2 ＝f 2 (I)
k 3 ＝f 3 (I)
k 4 ＝f 4 (I)
wherein k is 2 Is the temperature component coefficient, k of the contact 3 Upper contact arm temperature component coefficient, k 4 For the lower contact arm temperature component coefficient, f 2 (I) As a function of the contact temperature component, f 3 (I) As a function of the upper contact arm temperature component, f 4 (I) As a function of the down-arm temperature component.
10. The high voltage switchgear enclosure temperature inversion system of claim 7 wherein said enclosure temperature calculation module comprises:
the current acquisition unit is used for acquiring the current I introduced by the switch cabinet at the current moment at any moment of the operation of the switch cabinet 0 ；
A temperature actual measurement unit for measuring the temperature T of the upper contact arm at the current moment by using temperature sensors arranged on the upper contact arm, the lower contact arm and the inner wall of the switch cabinet 2 Lower contact arm temperature T 3 Temperature T of inner wall of switch cabinet 4 ；
A contact temperature calculation unit for calculating a contact temperature based on the current I 0 Upper contact arm temperature T 2 Lower contact arm temperature T 3 Temperature T of inner wall of switch cabinet 4 Based on coefficient k 2j 、k 3j 、k 4j Relation with current I, calculationCurrent contact temperature T inv The formula is:
T inv ＝f 2 (I 0 )T 2 +f 3 (I 0 )T 3 +f 4 (I 0 )T 4 +k r r
wherein f 2 (I 0 )、f 3 (I 0 ) And f 4 (I 0 ) The current is I respectively 0 Contact temperature, upper contact arm temperature and lower contact arm temperature component function values.
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