CN110161379B - Simulation test system for insulation damage degree of cable in low-temperature environment - Google Patents
Simulation test system for insulation damage degree of cable in low-temperature environment Download PDFInfo
- Publication number
- CN110161379B CN110161379B CN201910342428.7A CN201910342428A CN110161379B CN 110161379 B CN110161379 B CN 110161379B CN 201910342428 A CN201910342428 A CN 201910342428A CN 110161379 B CN110161379 B CN 110161379B
- Authority
- CN
- China
- Prior art keywords
- cable
- box body
- test
- insulating layer
- low
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/083—Locating faults in cables, transmission lines, or networks according to type of conductors in cables, e.g. underground
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- Testing Relating To Insulation (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Abstract
The application discloses impaired degree simulation test system of low temperature environment cable insulation, including test box, cable, system decrease device, control cabinet, current generator and controller. The console controls the damage device to damage the main insulating layer, enables the insulated damaged cable to slide to the lower testing box body, controls the small motor controller to enable the two isolation doors to be in a horizontal state, and controls the refrigerating sheet to provide a low-temperature environment for the isolated lower testing box body. When the lower testing box body is in a low-temperature environment, high-voltage current is introduced into the cable core controller through the current generator to obtain the change data of the surface temperature of the main insulating layer in the low-temperature environment along with the time, which is acquired by the temperature sensor, and a safety testing coefficient is calculated to test the insulation damage degree of the cable by utilizing the safety testing coefficient. The system realizes simulation test of the insulation damage degree of the cable in the low-temperature environment, and has very important significance for normal and stable operation of a power grid.
Description
Technical Field
The application relates to the technical field of power distribution networks, in particular to a simulation test system for the insulation damage degree of a cable in a low-temperature environment.
Background
With the continuous development of the power technology level, the construction speed of the power grid is gradually increased. Under the low temperature environment, the defects of the power transmission line threaten the safe operation of the power and communication network. For example, a spike defect is one of the common insulation defects of a cable, and the existence of the defect becomes an important safety hazard for the operation of the cable.
At present, the cable fault testing technology at home and abroad is developed to a higher level. Although various split-type test equipment at home and abroad can meet the technical requirements of the power and cable fault test industry, the insulation damage degree of the cable cannot be subjected to quality detection and defect diagnosis due to the particularity of cable installation.
Because the reliability and the safety of the cable have very important significance on the operation of a power grid, how to test the insulation damage degree of the cable in a low-temperature environment becomes a technical problem to be solved urgently in the field.
Disclosure of Invention
The application provides a low temperature environment cable insulation damage degree simulation test system to carry out the simulation test to the insulation damage degree of cable under the low temperature environment, establish the basis for the test technology development of the insulation damage degree of low temperature environment cable.
This implementation provides a low temperature environment cable insulation damage degree simulation test system, includes:
the testing box body is internally provided with two opposite isolating doors, one side edge of each isolating door is fixed on the wall of the testing box body through a small motor controller, and when the two isolating doors are in a horizontal state under the control action of the small motor controller, the space in the testing box body is divided into an upper part and a lower part; the upper end of the vertical slide rail at the two sides is respectively connected with the two ends of the horizontal slide rail; the refrigerating pieces are arranged on at least two surfaces of the lower testing box body so as to provide a low-temperature environment for the lower testing box body under the condition that the isolation door isolates the upper testing box body;
the cable is positioned in the test box body and comprises a cable core and a main insulating layer covering the cable core; cable core rotating devices are arranged at two ends of the cable core and are connected with vertical sliding blocks sliding on the vertical sliding rails, so that the cable can move up and down in the test box body along the vertical sliding rails; the outer surface of the main insulating layer is provided with a temperature sensor used for collecting the change data of the surface temperature of the main insulating layer along with time in a low-temperature environment in the simulation test process;
the damage manufacturing device comprises a horizontal sliding block sliding on a horizontal sliding rail; the horizontal sliding block is provided with a needle point control nozzle and a copper needle, and when the cable slides to a damaged position, the copper needle is in contact with the main insulating layer (8), penetrates into the main insulating layer under the control of the needle point control nozzle, and is damaged through the sliding of the copper needle in the horizontal direction;
the control console comprises a plurality of buttons, and the buttons are used for controlling the sliding of the horizontal sliding block on the horizontal sliding rail and the vertical sliding block) on the vertical sliding rail and controlling the needle point control nozzle to control the penetration depth of copper to the main insulating layer in the simulation test process, so that the damage manufacturing device applies damage to the cable, and the cable with damaged insulation slides to the lower test box body; controlling the small motor controller to enable the two isolation doors to be in a horizontal state; the refrigeration sheet is controlled to provide a low-temperature environment for the isolated lower test box body;
the current generator is provided with a positive port and a negative port; the positive port and the negative port are respectively connected with two ends of the cable core through high-voltage contact poles so as to lead high-voltage current into the cable core when the lower test box body is in a low-temperature environment;
and the controller is in communication connection with the temperature sensor and is used for acquiring the change data of the surface temperature of the main insulating layer in the low-temperature environment along with time in the simulation test process, and calculating to obtain a safety test coefficient so as to test the insulation damage degree of the cable by using the safety test coefficient.
Further, the data of the change of the surface temperature of the main insulating layer in the low-temperature environment along with the time is a continuous function of the surface temperature T of the main insulating layer to a time point T on a continuous time period [0, NL ]; the controller obtains a safety test coefficient through the following steps:
the surface temperature T of the primary insulating layer is measured for successive periods of time [0, NL ]]The continuous function at the time point T is segmented to obtain N functions T ═ fi(t)，t∈[(i-1)L,iL]；
Divide each time interval n into equal parts, and pair fi(t) performing Fourier series expansion to obtain:
wherein the content of the first and second substances,
according to each function T ═ fi(t) Fourier expansion to obtain the array [ X [ ]1,X2,X3,…,XN]And [ Y1,Y2,Y3,…,YN]Wherein X isi＝ain-ai0,Yi＝bin-bi0；
And calculating to obtain a safety test coefficient p according to the following formula:
wherein the content of the first and second substances,
is an array [ X ]1,X2,X3,…,XN]Is determined by the average value of (a) of (b),
is an array [ Y1,Y2,Y3,…,YN]Average value of (a).
Further, the controller determines the insulation damage degree of the cable according to the safety test coefficient and a safety factor value range preset by the cable insulation damage degree level.
Furthermore, a high-voltage cable is led out from the positive port and the negative port respectively, and the high-voltage contact electrode is arranged at the free end of the high-voltage cable.
Furthermore, a fixing hole is formed in the position where the lower testing box body is connected with the lower ends of the vertical sliding rails on the two sides, and is used for fixing the cable at the temperature change testing position of the lower testing box body in the simulation testing process.
According to the technical scheme, the simulation test system for the insulation damage degree of the cable in the low-temperature environment comprises a test box body, the cable, a damage making device, a control console, a current generator and a controller, wherein in the simulation test process, the control console controls the horizontal sliding block to slide on a horizontal sliding rail, controls the vertical sliding block to slide on a vertical sliding rail and controls a needle point control nozzle to control the penetration depth of copper to a main insulation layer, so that the damage making device exerts damage on the cable, the insulation damaged cable slides to the lower test box body, the small motor controller is controlled to enable two isolation doors to be in a horizontal state, and a refrigeration piece is controlled to provide the low-temperature environment for the isolated lower test box body; when the lower test box body is in a low-temperature environment, high-voltage current is introduced into the cable core through the current generator; the change data of the surface temperature of the main insulating layer in the low-temperature environment along with the time, which is acquired by the temperature sensor, is acquired through the controller, and the safety test coefficient is calculated to test the insulation damage degree of the cable by utilizing the safety test coefficient. The system realizes simulation test of the insulation damage degree of the cable in the low-temperature environment, lays a foundation for the development of the test technology of the insulation damage degree of the cable in the low-temperature environment, and has very important significance for normal and stable operation of a power grid.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any creative effort.
FIG. 1 is a schematic view of an embodiment of a cable insulation damage degree simulation test system in a low-temperature environment according to the present application;
fig. 2 is a flow chart of a simulation test method for the insulation damage degree of the cable in the low-temperature environment.
Detailed Description
Fig. 1 is a schematic view of an embodiment of a cable insulation damage degree simulation test system in a low-temperature environment according to the present application. As shown in fig. 1, the system may include a test box 1, cables, damage-causing devices, a console 15, a current generator 17, and a controller 21. Wherein:
the testing box comprises a testing box body 1, wherein the testing box body 1 comprises two opposite isolating doors 2, one side edge of each isolating door 2 is fixed on the wall of the testing box body through a small motor controller 3, and when the two isolating doors 2 are in a horizontal state under the control action of the small motor controller 3, the space in the testing box body 1 is divided into an upper part and a lower part; the two sides of the test box body 1 are provided with vertical slide rails 4, the upper test box body is provided with horizontal slide rails 5, and the upper ends of the vertical slide rails 4 at the two sides are respectively connected with the two ends of the horizontal slide rails 5; at least two surfaces of the lower test box body are provided with refrigeration sheets 6 so as to provide a low-temperature environment for the lower test box body under the condition that the isolation door 2 isolates the upper test box body.
It should be noted that the cooling fins 6 may be disposed inside or outside the lower testing box, and in order to improve the cooling efficiency, the cooling fins 6 are disposed inside the box in this embodiment.
In addition, a fixing hole 23 is formed at a position where the lower test box body is connected with the lower ends of the vertical slide rails 4 at both sides, and is used for fixing the cable at a temperature change test position of the lower test box body in the simulation test process. Of course, a limiting block may be provided at a specific position of the rail of the vertical slide rail 4 so that the cable can be fixed at the temperature change test position of the lower test chamber.
The cable is positioned in the test box body and comprises a cable core 7 and a main insulating layer 8 covering the cable core 7; two ends of the cable core 7 are provided with cable core rotating devices 9, and the cable core rotating devices 9 are connected with vertical sliding blocks 10 sliding on the vertical sliding rails 4, so that the cable can move up and down in the test box body along the vertical sliding rails 4; the outer surface of the main insulating layer 8 is provided with a temperature sensor 11 for collecting the change data of the surface temperature of the main insulating layer 8 along with time in a low-temperature environment in the simulation test process.
It should be noted that, in the simulation test system for the insulation damage degree of the cable in the low temperature environment shown in fig. 1, two cables are included, which respectively represent two positions where the cable is located in the simulation test process, one of the two positions is a damaged position in the upper test box, and the other is a temperature change test position in the lower test box.
The damage-making device comprises a horizontal sliding block 12 sliding on the horizontal sliding rail 5; be equipped with needle point control mouth 13 and copper needle 14 on the horizontal sliding block 12, be used for when the cable slides to impaired position, copper needle 14 and the contact of main insulation layer 8 pierce main insulation layer 8 under needle point control mouth 13's control to make the damage through the slip of copper needle 14 in the horizontal direction.
The control console 15 comprises a plurality of buttons 16, and the buttons are used for controlling the sliding of the horizontal sliding block 12 on the horizontal sliding rail 5, the sliding of the vertical sliding block 10 on the vertical sliding rail 4 and the penetration depth of the copper needle 14 on the main insulating layer 8 in the simulation test process, so that the damage manufacturing device can apply damage to the cable, and the cable with damaged insulation can slide to the lower test box body; controlling the small-sized motor controller 3 to enable the two isolation doors 2 to be in a horizontal state; the control refrigeration plate 6 provides a low temperature environment for the isolated lower test box.
For example, a vertical slide control button, a horizontal slide control button, an isolation door control button, a temperature control button, and the like are provided on the console 15. The vertical sliding rail control button is connected with a driving device for driving the vertical sliding block, and the vertical sliding rail control button is pressed on the control console to control the cable to move up and down in the test box body; the horizontal sliding rail control button is connected with a driving device for driving the horizontal sliding block, and the horizontal movement of the damage control device is controlled by pressing the horizontal sliding rail control button on the console; connecting a temperature control button with the refrigeration sheet to control the refrigeration temperature; the isolation door control button is connected with the small motor controller to control the horizontal angle of the isolation door.
Of course, in other embodiments, the device may be controlled by infrared remote control.
A current generator 17, said current generator 17 being provided with a positive port 18 and a negative port 19; the positive port 18 and the negative port 19 are respectively connected with two ends of the cable core 7 through high-voltage contact poles 20, so that high-voltage current is introduced into the cable core 7 when the lower test box body is in a low-temperature environment.
Specifically, a high voltage cable 22 is led out from the positive polarity port 18 and the negative polarity port 19, respectively, and a high voltage contact pole 20 is arranged at the free end of the high voltage cable 22.
In addition, the input current value can be set on the current generator to meet the requirements of different test scenes.
And the controller 21 is in communication connection with the temperature sensor 11, for example, the controller 21 is connected with the temperature sensor 11 by using a data transmission line 24 shown in fig. 1, so as to obtain the change data of the surface temperature of the main insulating layer 8 in the low-temperature environment along with the time in the simulation test process, calculate and obtain a safety test coefficient, and test the damage degree of the cable insulation by using the safety test coefficient.
Fig. 2 shows a flow of a method for performing simulation test on the insulation damage degree of the cable by using the low-temperature environment cable insulation damage degree simulation test system with the above structure, and as shown in fig. 2, the using method may include:
the console controls the damage-making device to apply damage to the primary insulation of the cable, step 110.
Specifically, the cable is moved to the damaged position by the console, i.e., the position where the copper pin is in contact with the main insulation layer. And controlling the needle point control nozzle to enable the copper needle to penetrate into the main insulating layer downwards, and then controlling the horizontal smooth block to move, so that the copper needle is driven to move, and further damage is formed on the main insulating layer. Wherein, according to the copper needle depth of penetration, the difference of moving direction and migration distance, can form the damage of different degree and form on the main insulating layer.
Step 120, the console controls the cable to move to the temperature change test position.
The temperature change testing position is the position where a certain cable in the lower testing box body can stay. In this application, exert insulation damage for the cable in the experimental box of upper portion, will impaired cable lead to with high tension current in the experimental box of lower part and test, in the testing process, the experimental box of lower part passes through the isolating door with the experimental box of upper portion and keeps apart, guarantees the security of testing process to and keep warm.
And step 130, controlling the refrigerating piece to refrigerate by the console to provide a low-temperature environment for the simulation test process.
Wherein a specific refrigeration temperature, for example-8 deg.c to 0 deg.c, may be set at the console. A temperature control program can be designed in advance, and when the refrigerating sheet starts to work, the refrigerating sheet can refrigerate according to the set temperature control program, for example, the refrigerating sheet refrigerates at a constant speed in the previous period, and the lower test box starts to preserve heat after reaching the environmental temperature required by the test.
The current generator is activated 140 to pass high voltage current through the damaged cable.
In step 140, a specific current value may be set in the current generator.
And 150, acquiring the change data of the surface temperature of the main insulating layer in the low-temperature environment along with the time by the temperature sensor, and transmitting the acquired data to the controller.
And 160, receiving the change data of the surface temperature of the main insulating layer in the low-temperature environment along with the time by the controller, and calculating to obtain a safety test coefficient so as to test the insulation damage degree of the cable by using the safety test coefficient.
Wherein, the data of the surface temperature of the main insulating layer 8 in the low-temperature environment along with the time is a continuous function of the surface temperature T of the main insulating layer 8 to the time point T on the continuous time period [0, NL ].
The controller can calculate and obtain the safety test coefficient by the following steps:
step 161, couple the primary insulation layer surface temperature T to the continuous time period [0, NL ]]The continuous function at the time point T is segmented to obtain N functions T ═ fi(t)，t∈[(i-1)L,iL]And i represents the sequence number of each divided continuous function according to the time. In order to ensure the effectiveness of the simulation test, in the embodiment, the length of each time period is controlled to be 5min to 10min, i.e. L ∈ [5min, 10 min)]。
Step 162, divide each time interval n, etc., and pair fi(t) performing Fourier series expansion to obtain:
wherein the content of the first and second substances,
step 163, according to each function T ═ fi(t) Fourier expansion to obtain the array [ X [ ]1,X2,X3,…,XN]And [ Y1,Y2,Y3,…,YN]In which X isi＝ain-ai0,Yi＝bin-bi0。
Step 164, calculating to obtain a safety test coefficient p according to the following formula:
wherein the content of the first and second substances,
is an array [ X ]1,X2,X3,…,XN]Is determined by the average value of (a) of (b),
is an array [ Y1,Y2,Y3,…,YN]Average value of (a).
In this embodiment, the controller 21 determines the insulation damage degree of the cable according to the safety test coefficient and a safety factor value range preset in the cable insulation damage degree level.
For example, when m2＜p＜m1The cable runs reliably;
when m is3＜p＜m2When the cable is damaged slightly in operation;
when m is4＜p＜m3When the cable is damaged, the cable is proved to be damaged moderately;
when m is4When < p, this cable is heavily damaged.
Wherein, empirically, m1Can be taken as 1, m2Can be taken as 0.9, m3Can be taken as 0.7 m4May be taken to be 0.5.
According to the technical scheme, the simulation test system for the insulation damage degree of the cable in the low-temperature environment comprises a test box body, the cable, a damage making device, a control console, a current generator and a controller, wherein in the simulation test process, the control console controls the horizontal sliding block to slide on a horizontal sliding rail, controls the vertical sliding block to slide on a vertical sliding rail and controls a needle point control nozzle to control the penetration depth of copper to a main insulation layer, so that the damage making device exerts damage on the cable, the insulation damaged cable slides to the lower test box body, the small motor controller is controlled to enable two isolation doors to be in a horizontal state, and a refrigeration piece is controlled to provide the low-temperature environment for the isolated lower test box body; when the lower test box body is in a low-temperature environment, high-voltage current is introduced into the cable core through the current generator; the change data of the surface temperature of the main insulating layer in the low-temperature environment along with the time, which is acquired by the temperature sensor, is acquired through the controller, and the safety test coefficient is calculated to test the insulation damage degree of the cable by utilizing the safety test coefficient. The system realizes simulation test of the insulation damage degree of the cable in the low-temperature environment, lays a foundation for the development of the test technology of the insulation damage degree of the cable in the low-temperature environment, and has very important significance for normal and stable operation of a power grid.
In specific implementation, the invention further provides a computer storage medium, wherein the computer storage medium may store a program, and the program may include some or all of the steps in the embodiments of the using method provided by the invention when executed. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM) or a Random Access Memory (RAM).
Those skilled in the art will readily appreciate that the techniques of the embodiments of the present invention may be implemented as software plus a required general purpose hardware platform. Based on such understanding, the technical solutions in the embodiments of the present invention may be essentially or partially implemented in the form of a software product, which may be stored in a storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the embodiments or some parts of the embodiments.
The same and similar parts in the various embodiments in this specification may be referred to each other. The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention.
Claims (5)
1. A simulation test system for the insulation damage degree of a cable in a low-temperature environment is characterized by comprising:
the testing box comprises a testing box body (1), wherein two isolating doors (2) which are oppositely arranged are arranged in the testing box body (1), one side edge of each isolating door (2) is fixed on the wall of the testing box body through a small motor controller (3), and when the two isolating doors (2) are in a horizontal state under the control action of the small motor controller (3), the space in the testing box body (1) is divided into an upper part and a lower part; the two sides of the test box body (1) are provided with vertical slide rails (4), the upper test box body is provided with horizontal slide rails (5), and the upper ends of the vertical slide rails (4) on the two sides are respectively connected with the two ends of the horizontal slide rails (5); refrigeration sheets (6) are arranged on at least two surfaces of the lower testing box body so as to provide a low-temperature environment for the lower testing box body under the condition that the upper testing box body is isolated by the isolation door (2);
the cable is positioned in the test box body and comprises a cable core (7) and a main insulating layer (8) covering the cable core (7); two ends of the cable core (7) are provided with cable core rotating devices (9), and the cable core rotating devices (9) are connected with vertical sliding blocks (10) sliding on the vertical sliding rails (4) so that the cable can move up and down in the test box body along the vertical sliding rails (4); the outer surface of the main insulating layer (8) is provided with a temperature sensor (11) which is used for collecting the change data of the surface temperature of the main insulating layer (8) along with the time in the low-temperature environment in the simulation test process;
the damage-making device comprises a horizontal sliding block (12) sliding on a horizontal sliding rail (5); the horizontal sliding block (12) is provided with a needle point control nozzle (13) and a copper needle (14), and when the cable slides to a damaged position, the copper needle (14) is in contact with the main insulating layer (8), penetrates into the main insulating layer (8) under the control of the needle point control nozzle (13), and is damaged on the main insulating layer (8) through the sliding of the copper needle (14) in the horizontal direction of the main insulating layer (8);
the control console (15) comprises a plurality of buttons (16) which are used for controlling the sliding of the horizontal sliding block (12) on the horizontal sliding rail (5), the sliding of the vertical sliding block (10) on the vertical sliding rail (4) and the needle point control nozzle (13) to control the penetration depth of the copper needle (14) on the main insulating layer (8) in the simulation test process, so that the damage manufacturing device can damage the cable, and the cable with damaged insulation can slide to the lower test box body; controlling the small motor controller (3) to enable the two isolation doors (2) to be in a horizontal state; the refrigerating sheet (6) is controlled to provide a low-temperature environment for the isolated lower test box body;
a current generator (17), said current generator (17) being provided with a positive polarity port (18) and a negative polarity port (19); the positive port (18) and the negative port (19) are respectively connected with two ends of the cable core (7) through high-voltage contact poles (20) so as to lead high-voltage current to the cable core (7) when the lower test box body is in a low-temperature environment;
the controller (21) is in communication connection with the temperature sensor (11) and used for acquiring change data of the surface temperature of the main insulating layer (8) in the low-temperature environment along with time in the simulation test process, and calculating to obtain a safety test coefficient so as to test the insulation damage degree of the cable by using the safety test coefficient.
2. The system of claim 1, wherein the data of the change of the surface temperature of the primary insulating layer (8) with time is a continuous function of the surface temperature T of the primary insulating layer (8) to a time point T over a continuous period of time [0, NL ]; the controller obtains a safety test coefficient through the following steps:
the surface temperature T of the primary insulating layer is measured for successive periods of time [0, NL ]]The continuous function at the time point T is segmented to obtain N functions T ═ fi(t)，t∈[(i-1)L,iL]；
Divide each time interval n into equal parts, and pair fi(t) performing Fourier series expansion to obtain:
wherein the content of the first and second substances,
according to each function T ═ fi(t) Fourier expansion to obtain the array [ X [ ]1,X2,X3,…,XN]And [ Y1,Y2,Y3,…,YN]Wherein X isi＝ain-ai0,Yi＝bin-bi0；
And calculating to obtain a safety test coefficient p according to the following formula:
wherein the content of the first and second substances,
is an array [ X ]1,X2,X3,…,XN]Is determined by the average value of (a) of (b),
is an array [ Y1,Y2,Y3,…,YN]Average value of (a).
3. The system according to claim 1, wherein the controller (21) determines the insulation damage degree of the cable according to a safety test coefficient and a safety factor value range preset by the cable insulation damage degree level.
4. The system according to claim 1, characterized in that the positive port (18) and the negative port (19) each lead out a high voltage cable line (22), the high voltage contact pole (20) being arranged at the free end of the high voltage cable line (22).
5. The system according to claim 1, wherein the lower test box is provided with a fixing hole (23) at a position connected with the lower ends of the vertical sliding rails (4) at both sides for fixing the cable at a temperature change test position of the lower test box during the simulation test.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910342428.7A CN110161379B (en) | 2019-04-26 | 2019-04-26 | Simulation test system for insulation damage degree of cable in low-temperature environment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910342428.7A CN110161379B (en) | 2019-04-26 | 2019-04-26 | Simulation test system for insulation damage degree of cable in low-temperature environment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110161379A CN110161379A (en) | 2019-08-23 |
| CN110161379B true CN110161379B (en) | 2020-10-27 |
Family
ID=67640170
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910342428.7A Active CN110161379B (en) | 2019-04-26 | 2019-04-26 | Simulation test system for insulation damage degree of cable in low-temperature environment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110161379B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114167166A (en) * | 2021-11-15 | 2022-03-11 | 昆明昆宝电线电缆制造有限公司 | Wire and cable water-blocking low-temperature-resistant performance test detection system |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003034732A (en) * | 2001-07-24 | 2003-02-07 | Toray Ind Inc | Polybutylene terephthalate resin foamed molded article |
| CN103592529A (en) * | 2013-09-11 | 2014-02-19 | 天津学子电力设备科技有限公司 | Method for evaluating insulation aging of XLPE (cross linked polyethylene) cable based on low-temperature pulse |
| CN104297646B (en) * | 2014-10-14 | 2017-02-15 | 中国南方电网有限责任公司电网技术研究中心 | Load cycle test insulating temperature gradient control method and system for high-voltage direct-current cables |
| CN109557135A (en) * | 2017-09-26 | 2019-04-02 | 南京龙贞自控科技发展有限公司 | A kind of electric cable stoppage detection system based on temperature |
| CN108957165A (en) * | 2018-04-28 | 2018-12-07 | 国网山东省电力公司烟台供电公司 | A kind of transmission line of electricity porcelain insulator thermometric experimental provision |
| CN109239525B (en) * | 2018-08-22 | 2019-12-10 | 西南交通大学 | Cable radial damage fault simulation evaluation method under split-phase overvoltage |
| CN109406376B (en) * | 2018-11-08 | 2023-12-12 | 国网浙江象山县供电有限公司 | Humiture self-adaptation cable ageing test device |
-
2019
- 2019-04-26 CN CN201910342428.7A patent/CN110161379B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN110161379A (en) | 2019-08-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110161379B (en) | Simulation test system for insulation damage degree of cable in low-temperature environment | |
| CN110161380B (en) | Icing area cable insulation damage degree simulation test system | |
| CN109884444A (en) | A kind of cable operating status intelligent monitor system and method | |
| CN107045098B (en) | Hot and cold alternation operating condition is got off download cable terminal industrial frequency withstand voltage pilot system and method | |
| CN107621574B (en) | Study the experimental method of loading condition setting of casing interior insulation moisture distribution | |
| CN115758730A (en) | Aging detection method and device for self-melting type cable intermediate joint | |
| CN112557847A (en) | Polypropylene cable composite aging test device and method | |
| CN105808830A (en) | Method for calculating thermal ageing states of cables by utilizing load current of cables | |
| CN107091955A (en) | The dielectric loss experimental system and method for cable termination under the conditions of high and low temperature alternative | |
| CN109975672A (en) | One kind having relaying submarine optical fiber cable insulation life Index Assessment method | |
| CN220171218U (en) | Cable on-off detection device | |
| CN109087780B (en) | Single-box type intelligent energy-saving transformer | |
| CN112526292A (en) | Distribution cable operation quality examination and test platform | |
| Taheri et al. | Electrical performance evaluation of EHV post insulators covered with ice under different air gap configurations | |
| CN102830153A (en) | Device for detecting correlation between paper oil insulation micro-water distribution and dielectric response | |
| CN109917256B (en) | Method for evaluating insulation performance of bushing capacitor core under temperature change | |
| CN103645419A (en) | Fault early-warning system and method for electric power circuit of wind power field | |
| CN109239525B (en) | Cable radial damage fault simulation evaluation method under split-phase overvoltage | |
| CN110161352A (en) | Frequency response test device and method under analogue transformer winding interturn short-circuit | |
| CN110007161B (en) | Method for measuring direct current cable insulation space charge distribution at different temperatures | |
| CN204732719U (en) | One utilizes original middle-placed switch cabinet to generator heating and dehumidification device | |
| Marungsri et al. | Investigation life time model of 22 kV XLPE cable for distribution system applications in Thailand | |
| CN218959140U (en) | Electric heating integrated module | |
| CN112863837A (en) | Box-type transformer environment self-adaption system and method | |
| CN215768338U (en) | Detection apparatus for fire-retardant fire resistance of electric wire |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |