CN111602039A - Device and method for monitoring the temperature of a cable joint of a cable connected to a gas-insulated switchgear - Google Patents
Device and method for monitoring the temperature of a cable joint of a cable connected to a gas-insulated switchgear Download PDFInfo
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- CN111602039A CN111602039A CN201880085354.7A CN201880085354A CN111602039A CN 111602039 A CN111602039 A CN 111602039A CN 201880085354 A CN201880085354 A CN 201880085354A CN 111602039 A CN111602039 A CN 111602039A
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- cable
- temperature
- adapter
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- cable joint
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/14—Supports; Fastening devices; Arrangements for mounting thermometers in particular locations
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
- H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
- H02B13/035—Gas-insulated switchgear
- H02B13/0358—Connections to in or out conductors
Abstract
An apparatus and a method for monitoring the temperature of a cable joint (201) of a cable (200) connected to a gas-insulated switchgear (300). The arrangement comprises an adapter (101) adapted to be coupled to a cable socket (31) of the switchgear, the cable socket being provided with a mounting hole (311) for connecting a cable joint, the mounting hole being provided at a mounting surface (312), wherein the adapter is located at the mounting surface and outside the mounting hole when coupled to the cable socket; a temperature sensor (102) disposed in the adapter and configured to detect a temperature of the adapter; and a processor (103) configured to determine a temperature of the cable joint based on the detected temperature of the adapter. Thus, the temperature of the cable joint can be determined easily and accurately.
Description
Technical Field
Embodiments of the present disclosure relate generally to the field of electrical equipment, and more particularly, to an apparatus and method for monitoring the temperature of a cable joint of a cable connected to a Gas Insulated Switchgear (GIS).
Background
GIS is widely used in high voltage power distribution applications. In use, the cable is typically connected to the GIS by a cable connector in order to transmit power to the GIS. If the connection between the cable joint and the GIS is poor, a large contact resistance may occur at the cable joint. Therefore, when current flows in the cable, the temperature of the cable joint may be significantly increased. Currently, there is an increasing demand for monitoring the temperature of cable joints. However, the difficulty in monitoring the temperature of the cable joint is that the cable used in the GIS is a fully insulated cable and there is no extra space for mounting the temperature sensor to the cable joint.
Therefore, a new solution for monitoring the temperature of a cable joint that is easy to use and accurate is needed.
Disclosure of Invention
In a first aspect of the present disclosure, an apparatus for monitoring the temperature of a cable joint of a cable connected to a gas-insulated switchgear device is provided. The apparatus comprises an adapter adapted to be coupled to a cable socket of the switchgear, the cable socket being provided with a mounting hole for connecting a cable connector, the mounting hole being provided at a mounting surface, wherein the adapter is located at the mounting surface and outside the mounting hole when coupled to the cable socket; a temperature sensor disposed in the adapter and configured to detect a temperature of the adapter; and a processor configured to determine a temperature of the cable joint based on the detected temperature of the adapter.
In some embodiments, the adapter comprises: a first portion coupled to the cable receptacle at the mounting surface; and a second portion configured to house a temperature sensor.
In some embodiments, the cable socket includes a threaded hole at the mounting surface and the first portion is a threaded rod adapted to be inserted into the threaded hole.
In some embodiments, the second portion includes a receiving hole in which the temperature sensor is disposed and sealed by the potting adhesive.
In some embodiments, the apparatus further comprises a current sensor configured to detect a current in the cable, wherein the processor is further configured to determine the temperature of the cable joint further based on the current in the cable.
In some embodiments, the processor is configured to determine the temperature of the cable joint by: determining a temperature of the cable joint based on the detected temperature of the adapter and a first relationship between the temperature of the cable joint and the temperature of the adapter when an increase in current in the cable is detected; and determining the temperature of the cable joint based on the detected temperature of the adapter and a second relationship between the temperature of the cable joint and the temperature of the adapter when the current in the cable is detected to decrease, the second relationship being different from the first relationship.
In some embodiments, determining the temperature of the cable joint further based on the current in the cable comprises: increasing the determined temperature value of the cable joint by a first compensation value when the instantaneous increase of the current in the cable exceeds a first threshold value; and reducing the determined temperature value of the cable joint by a second compensation value when the momentary reduction of the current in the cable exceeds a second threshold value.
In a second aspect of the present disclosure, a method for monitoring the temperature of a cable joint of a cable connected to a gas-insulated switchgear device is provided. The method comprises the following steps: detecting a temperature of an adapter by means of a temperature sensor arranged in the adapter, the adapter being adapted to be coupled to a cable socket of a switching device, the cable socket being provided with a mounting hole for connecting a cable connector, the mounting hole being provided at a mounting surface, wherein the adapter, when coupled to the cable socket, is located at the mounting surface and outside the mounting hole; and determining a temperature of the cable joint based on the detected temperature of the adapter.
In some embodiments, the cable receptacle includes a threaded hole at the mounting surface, and the adapter includes: a first portion of a threaded rod configured for insertion into a threaded bore; and a second portion configured to house a temperature sensor.
In some embodiments, the second portion includes a receiving hole in which the temperature sensor is disposed and sealed by the potting adhesive.
In some embodiments, the method further comprises: detecting a current in the cable by a current sensor; determining a temperature of the cable joint based on the detected temperature of the adapter and a first relationship between the temperature of the cable joint and the temperature of the adapter when an increase in current in the cable is detected; and determining the temperature of the cable joint based on the detected temperature of the adapter and a second relationship between the temperature of the cable joint and the temperature of the adapter when the current in the cable is detected to decrease, the second relationship being different from the first relationship.
In some embodiments, the first relationship is obtained by linear fitting of at least two pairs of temperatures of the cable joint and the adapter, the second relationship is obtained by linear fitting of at least three pairs of temperatures of the cable joint and the adapter, and the at least three pairs of temperatures include at least one pair of transient temperatures of the cable joint and the adapter.
In some embodiments, the at least three pairs of temperatures include at least one pair of transient temperatures of the cable joint and the adapter: increasing the determined temperature value of the cable joint by a first compensation value when the instantaneous increase of the current in the cable exceeds a first threshold value; and reducing the determined temperature value of the cable joint by a second compensation value when the momentary reduction of the current in the cable exceeds a second threshold value.
In a third aspect of the present disclosure, a gas-insulated switchgear device is provided, comprising an apparatus according to the first aspect of the present disclosure.
According to various embodiments of the present disclosure, a temperature sensor is disposed in an adapter coupled to a cable receptacle of a switchgear, and a temperature of a cable joint may be determined based on a temperature of the adapter. Since the adapter is located close to the cable joint, the temperature of the cable joint can be determined easily and accurately. Furthermore, the temperature sensor is easy to install and maintain by means of the adapter.
Drawings
The above and other objects, features and advantages of the example embodiments disclosed herein will become more apparent from the following detailed description, which proceeds with reference to the accompanying drawings. Several exemplary embodiments disclosed herein are illustrated by way of example and not by way of limitation in the figures of the accompanying drawings, in which:
fig. 1 schematically shows a gas-insulated switchgear device according to an example embodiment;
FIG. 2 schematically illustrates an apparatus for monitoring the temperature of a cable joint according to an example embodiment;
figure 3 schematically shows an example arrangement of a device for monitoring the temperature of a cable joint relative to a cable socket;
FIG. 4 schematically shows in an enlarged view the adapter and the temperature sensor of the device as shown in FIG. 3;
FIG. 5 is a schematic cross-sectional view of the cable socket shown in FIG. 3;
FIG. 6 schematically illustrates an apparatus for monitoring the temperature of a cable joint according to another example embodiment;
FIG. 7 is a graph schematically illustrating the actual temperature of the adapter and cable joint as the current in the cable varies;
FIG. 8 is a graph schematically illustrating a first fit relationship between the temperature of the cable joint and the adapter as the current in the cable increases;
FIG. 9 is a graph schematically illustrating a second fit relationship between the temperature of the cable joint and the adapter when the current in the cable decreases;
fig. 10A is a graph schematically showing the actual temperature and the determined temperature of the cable joint of phase a;
fig. 10B is a graph schematically showing the actual temperature and the determined temperature of the cable joint of phase B;
fig. 10C is a graph schematically showing the actual temperature and the determined temperature of the cable joint of phase C;
FIG. 11A is a graph schematically illustrating the error between the determined temperature and the actual temperature of the cable joint without compensating for the determined temperature;
fig. 11B is a graph schematically illustrating an error between the determined temperature and an actual temperature of the cable joint after compensating for the determined temperature; and
fig. 12 is a flow chart of a method for monitoring the temperature of a cable joint of a cable connected to a switchgear according to an embodiment of the present disclosure.
Throughout the drawings, the same or similar reference numerals are used to designate the same or similar elements.
Detailed Description
The principles of the present disclosure will now be described with reference to a number of exemplary embodiments shown in the drawings. While the exemplary embodiments of the present disclosure have been illustrated in the accompanying drawings, it is to be understood that the embodiments are described merely to assist those skilled in the art in better understanding and thereby enabling the disclosure, and do not limit the scope of the disclosure in any way.
As described above, the difficulty in monitoring the temperature of the cable joint is that the cables used in GIS are all insulated cables and there is no excess space for mounting any temperature sensors to the cable joint. According to an embodiment of the present disclosure, the temperature sensor is arranged in an adapter coupled to a cable socket of the switching device, and the temperature of the cable joint may be determined based on the temperature of the adapter.
As will be described in detail in the following paragraphs, the above concepts may be implemented in various ways. Fig. 1-12 illustrate example ways and corresponding test results for implementing the principles of the present disclosure. Hereinafter, the principles of the present disclosure will be described in detail with reference to fig. 1 to 12.
Fig. 1 schematically shows a gas-insulated switchgear device 300 according to an example embodiment. As shown, the switching device 300 includes a cable socket 31. The cable 200 may be connected to the cable socket 31 through the cable connector 201 to transmit power to the switching device 300. In use, if the connection between the cable connector 201 and the cable socket 31 is poor, a large contact resistance may occur at the cable connector 201. In this case, when current flows in the cable 200, the temperature of the cable joint 201 may be significantly increased. In order to timely capture the temperature variations of the cable connector 201, the switching device 300 may further comprise means 100 for monitoring the temperature of the cable connector 201. Hereinafter, an example configuration of the apparatus 100 will be described in detail with reference to fig. 2 to 6.
Fig. 2 schematically shows an apparatus 100 for monitoring the temperature of a cable joint 201 according to an example embodiment, and fig. 3 schematically shows an example arrangement of the apparatus 100 relative to a cable socket 31. As shown, the cable receptacle 31 is provided with a mounting hole 311 for connecting the cable connector 201. The mounting hole 311 is provided at the mounting surface 312 of the cable receptacle 31.
In one embodiment, as shown in fig. 2 and 3, the apparatus 100 may include an adapter 101, a temperature sensor 102, and a processor 103. The adapter 101 is connected to the cable receptacle 31 at the mounting surface 312 and is located outside the mounting hole 311. Along the mounting surface 312, the adapter 101 is spaced a distance from the mounting hole 311. A temperature sensor 102 is arranged in the adapter 101 to detect the temperature of the adapter 101. Based on the detected temperature of the adapter 101, the processor 103 may determine the temperature of the cable connector 201 by a predetermined relationship between the temperatures of the adapter 101 and the cable connector 201.
Fig. 4 schematically shows the adapter 101 and the temperature sensor 102 shown in fig. 3 in an enlarged view, and fig. 5 is a schematic cross-sectional view of the cable socket 31 shown in fig. 3.
In one embodiment, as shown in FIG. 4, the adapter 101 may include a first portion 111 and a second portion 112. The first portion 111 may be coupled to the cable socket 31 at a mounting surface 312 of the cable socket 31. The temperature sensor 102 may be disposed in the second portion 112. Temperature sensor 102 may be connected to processor 103 through wires 115 and terminals 116. The value of the detected temperature of the adapter 101 may be provided to the processor 103 via the wire 115 and the terminal 116.
In one embodiment, the first portion 111 may be a threaded rod. Accordingly, as shown in fig. 5, the cable socket 31 may include a screw hole 313 at the mounting surface 312. The threaded hole 313 is spaced from the mounting hole 311 along the mounting surface 312. The first portion 111 may be screwed into or out of the threaded hole 313 by a threaded engagement between the threaded rod and the threaded hole 313. In this manner, the temperature sensor 102 is easy to install and maintain.
In other embodiments, the first portion 111 may be coupled to the cable receptacle 31 in other manners. As an example, the first portion 111 may be adhered or soldered to the cable socket 31. It should be appreciated that the first portion 111 may be coupled to the cable socket 31 in any other suitable manner. The present invention is not intended to limit the manner of coupling between the first portion 111 of the adapter 101 and the cable socket 31.
In one embodiment, as shown in fig. 4, the second portion 112 may include a receiving hole 113. The temperature sensor 102 may be disposed in the receiving hole 113 and sealed by the potting adhesive 114. With this arrangement, the temperature of the adapter 101 can be accurately detected by the temperature sensor 102. It should be understood that the temperature sensor 102 may be arranged in the adapter 101 in any other suitable manner. The present disclosure is not intended to limit the arrangement of the temperature sensor 102 in the adapter 101.
With the above embodiments of the present disclosure, the temperature sensor 102 may be conveniently arranged in the adapter 101 coupled to the cable socket 31, and the temperature of the cable connector 201 may be determined based on the temperature of the adapter 101. Since the adapter 101 is located close to the cable connector 201, the temperature of the cable connector 201 can be accurately determined.
Fig. 6 schematically shows an apparatus 100 for monitoring the temperature of a cable joint 201 according to another exemplary embodiment. The apparatus 100 shown in fig. 6 is similar to the apparatus 100 shown in fig. 2. Hereinafter, only the differences between the apparatus 100 of fig. 6 and the apparatus 100 of fig. 2 will be described in detail, and descriptions about the same parts will be omitted.
In the embodiment shown in fig. 6, the apparatus 100 further comprises a current sensor 104 for detecting the current in the cable 200. The processor 103 may further determine the temperature of the cable joint 201 based on the current in the cable 200. To further determine the temperature of the cable connector 201 based on the current in the cable 200, the temperature of the adapter 101 and the cable connector 201 as a function of the current in the cable 200 will be described in detail below with reference to fig. 7-11B.
Fig. 7 is a graph schematically showing the actual temperature of the adapter 101 and the cable joint 201 when the current in the cable 200 is changed. As shown, as the current in the cable 200 increases, e.g., from 200A to 2110A, the actual temperature of the cable connector 201 may gradually increase, and the actual temperature of the adapter 101 may increase accordingly. When the current in the cable 200 decreases, for example from 2110A to 450A, the actual temperature of the cable connector 201 may gradually decrease, and the actual temperature of the adapter 101 may decrease accordingly. However, the process of increasing the temperature of the adapter 101 is different from the process of decreasing the temperature of the adapter 101 because a temperature gradient field exists between the adapter 101 and the cable connector 201. Specifically, when the temperature of the cable connector 201 increases, the temperature of the adapter 101 may increase substantially in synchronization with the temperature of the cable connector 201. However, when the temperature of the cable connector 201 decreases, the temperature decrease of the adapter 101 may lag behind the temperature decrease of the cable connector 201. Therefore, the relationship between the temperatures of the cable joint 201 and the adapter 101 when the current in the cable 200 increases and decreases is different.
In one embodiment, when an increase in current in the cable 200 is detected, the processor 103 may determine the temperature of the cable connector 201 based on the detected temperature of the adapter 101 and a first relationship between the temperatures of the cable connector 201 and the adapter 101. With respect to the first relationship, FIG. 8 illustrates an example fitting process.
Fig. 8 is a graph schematically illustrating a first fitting relationship between the temperature of the cable joint 201 and the adapter 101 when the current in the cable 200 increases. As shown, pairs of temperatures of the cable connector 201 and the adapter 101 may be plotted in a graph. In one embodiment, two pairs of temperatures of the cable connector 201 and the adapter 101 in steady state can be plotted in a graph for each current shown in fig. 7. The first relationship may be fitted to a linear relationship by a least squares method. In another embodiment, one or more pairs of transient temperatures of the cable connector 201 and the adapter 101 may be plotted in a graph in addition to two pairs of temperatures of the cable connector 201 and the adapter 101 in steady state. With more temperature points, the fit relationship between the temperature of the cable connector 201 and the adapter 101 may be more accurate. It will be appreciated that the first relationship may be fitted in any other suitable manner. The present disclosure is not intended to limit the manner of fitting the first relationship.
In one embodiment, when a decrease in current in the cable 200 is detected, the processor 103 may determine the temperature of the cable connector 201 based on the detected temperature of the adapter 101 and a second relationship between the temperatures of the cable connector 201 and the adapter 101. In one example, the second relationship is different from the first relationship. With respect to the second relationship, FIG. 9 illustrates an example fitting process.
Fig. 9 is a graph schematically showing a second fitting relationship between the temperatures of the cable joint 201 and the adapter 101 when the current in the cable 200 is reduced. As shown, pairs of temperatures of the cable connector 201 and the adapter 101 may be plotted in a graph. In one embodiment, at least three pairs of temperatures of the cable connector 201 and the adapter 101 may be plotted in a graph for each current shown in fig. 7. The at least three pairs of temperatures may include at least one pair of transient temperatures of the cable connector 201 and the adapter 101. As an example, for each current as shown in FIG. 7, three temperatures TR of the adapter 101 may be determinedstable、TRstable_under_last_currentAnd TRtransientTo be plotted in a chart. TR (transmitter-receiver)stableIndicating the stable temperature of the adapter 101 for a particular current (e.g., 1500A) in the cable 200. TR (transmitter-receiver)stable_under_last_currentIndicating the stable temperature of the adapter 101 for the last current (e.g., 2110A). TR (transmitter-receiver)transientRepresenting the transient temperature of the adapter 101 for a particular current (e.g., 1500A) in the cable 200. In one embodiment, TRtransientThe selection can be made according to the thermal response time equation:
where e represents a natural constant. Using TRstableAnd TRstable_under_last_currentTR can be calculated from the above equationtransient. Thus, for each current shown in fig. 7, three pairs of temperatures for the cable connector 201 and the adapter 101 may be obtained and plotted in a graph.
With at least three pairs of temperatures of the cable connector 201 and the adapter 101, the second relationship can be fitted to a linear relationship by a least squares method. With more temperature points, the fit relationship between the temperature of the cable joint 201 and the adapter 101 may be more accurate as the current in the cable 200 decreases. It will be appreciated that the second relationship may be fitted in any other suitable manner. The present disclosure is not intended to limit the manner of fitting the second relationship.
Hereinafter, the test result of the determined temperature of the cable joint 201 will be described in detail with reference to fig. 10A to 10C. In one example, the switchgear 300 may be connected to multiple cables 200 of three phases A, B and C. For each cable 200, the temperature of the cable joint 201 may be determined in the manner described herein. Fig. 10A is a graph schematically showing the actual temperature and the determined temperature of the cable joint 201 of the a-phase, fig. 10B is a graph schematically showing the actual temperature and the determined temperature of the cable joint 201 of the B-phase, and fig. 10C is a graph schematically showing the actual temperature and the determined temperature of the cable joint 201 of the C-phase. As shown, the actual temperature and the determined temperature of the cable joint 201 substantially coincide with each other over time for each phase of the cable 200. Thus, the test results show that with embodiments of the present disclosure, the temperature of the cable joint 201 can be accurately determined.
Fig. 11A is a graph schematically showing an error between the determined temperature and the actual temperature of the cable joint 201 without compensating for the determined temperature. As shown, most of the time, the error between the determined temperature and the actual temperature of the cable joint 201 is below 5 ℃. However, at the beginning of a sharp change in the current in the cable 200, the error will reach 10 ℃. The reason for this phenomenon is that when the current in the cable 200 changes abruptly, the temperature of the cable connector 201 can follow the abrupt change, but due to the temperature gradient field between the cable connector 201 and the adapter 101, such a change takes some time to affect the temperature of the adapter 101.
In one embodiment, the processor 103 may increase the determined temperature value of the cable joint 201 by a first compensation value when the instantaneous increase of the current in the cable 200 exceeds a first threshold value. With the first threshold, a momentary increase in current can be found. In various embodiments, the first compensation value may be a fixed value or a value that varies over time. By increasing the determined temperature value of the cable joint 201 by the first compensation value, errors between the determined temperature and the actual temperature of the cable joint 201 can be compensated for when the current in the cable 200 increases. Thus, as the current in the cable 200 increases, the temperature of the cable joint 201 can be determined more accurately.
In one embodiment, when the instantaneous decrease in current in the cable 200 exceeds a second threshold, the processor 103 may decrease the determined temperature value of the cable joint 201 by a second compensation value. With the second threshold, a momentary reduction in current can be found. In various embodiments, the second compensation value may be a fixed value or a value that varies over time. By reducing the determined temperature value of the cable joint 201 by the second compensation value, errors between the determined temperature and the actual temperature of the cable joint 201 can be compensated for when the current in the cable 200 is reduced. Therefore, when the current in the cable 200 is reduced, the temperature of the cable joint 201 can be determined more accurately.
Fig. 11B is a graph schematically showing an error between the determined temperature and the actual temperature of the cable joint 201 after compensating for the determined temperature. As shown, after compensation, the error is substantially below 5 ℃.
Fig. 12 is a flow chart of a method for monitoring the temperature of the cable joint 201 according to an embodiment of the present disclosure. For example, the method 900 may be performed by the apparatus 100 for monitoring the temperature of the cable joint 201 as shown in fig. 2-6.
At block 910, a temperature of the adapter 101 is detected by a temperature sensor 102 disposed in the adapter 101. The adapter 101 is adapted to be coupled to a cable socket 31 of the switching device 300. The cable receptacle 31 is provided with a mounting hole 311 for connecting the cable connector 201. The mounting hole 311 is provided at the mounting surface 312. The adapter 101 is located at the mounting surface 312 and outside the mounting hole 311 when coupled to the cable receptacle 31.
In some embodiments, the cable receptacle 31 includes a threaded hole 313 at the mounting surface 312, and the adapter 101 includes: a first portion 111 configured as a threaded rod adapted to be inserted into the threaded hole 313; and a second portion 112 configured to house the temperature sensor 102.
In some embodiments, the second portion 112 includes a receiving hole 113, and the temperature sensor 102 is disposed in the receiving hole 113 and sealed by a potting adhesive 114.
At block 920, a temperature of the cable connector 201 is determined based on the detected temperature of the adapter 101.
In some embodiments, the method 900 further comprises: detecting the current in the cable 200 by the current sensor 104; when an increase in the current in the cable 200 is detected, determining the temperature of the cable connector 201 based on the detected temperature of the adapter 101 and a first relationship between the temperatures of the cable connector 201 and the adapter 101; and when a decrease in the current in the cable 200 is detected, determining the temperature of the cable connector 201 based on the detected temperature of the adapter 101 and a second relationship between the temperatures of the cable connector 201 and the adapter 101, the second relationship being different from the first relationship.
In some embodiments, the first relationship is obtained by linearly fitting at least two pairs of temperatures of the cable connector 201 and the adapter 101, the second relationship is obtained by linearly fitting at least three pairs of temperatures of the cable connector 201 and the adapter 101, and the at least three pairs of temperatures include at least one pair of transient temperatures of the cable connector 201 and the adapter 101.
In some embodiments, determining the temperature of the cable joint 201 further based on the current in the cable 200 comprises: increasing the determined temperature value of the cable joint 201 by a first compensation value when the momentary increase of the current in the cable 200 exceeds a first threshold value; and reducing the determined temperature value of the cable joint 201 by a second compensation value when the momentary reduction of the current in the cable 200 exceeds a second threshold value.
It is to be understood that the above detailed embodiments of the present disclosure are only intended to illustrate or explain the principles of the present disclosure, and do not limit the present disclosure. Therefore, any modification, equivalent replacement, and improvement without departing from the spirit and scope of the present disclosure should be included in the protection scope of the present disclosure. Also, it is intended that the appended claims cover all such variations and modifications that fall within the scope and boundaries of the claims or the equivalents thereof.
Claims (14)
1. An arrangement (100) for monitoring the temperature of a cable joint (201) of a cable (200) connected to a gas-insulated switchgear (300), comprising:
an adapter (101) adapted to be coupled to a cable socket (31) of the switching device (300), the cable socket (31) being provided with a mounting hole (311) for connecting the cable connector (201), the mounting hole (311) being provided at a mounting surface (312), wherein the adapter (101) is located at the mounting surface (312) and outside the mounting hole (311) when coupled to the cable socket (31);
a temperature sensor (102) arranged in the adapter (101) and configured to detect a temperature of the adapter (101); and
a processor (103) configured to determine a temperature of the cable joint (201) based on the detected temperature of the adapter (101).
2. The apparatus (100) of claim 1, wherein the adapter (101) comprises:
a first portion (111) coupled to the cable receptacle (31) at the mounting surface (312); and
a second portion (112) configured for housing the temperature sensor (102).
3. The device (100) of claim 2, wherein the cable socket (31) comprises a threaded hole (313) at the mounting surface (312) and the first portion (111) is a threaded rod adapted to be inserted into the threaded hole (313).
4. The device (100) according to claim 2, wherein the second portion (112) comprises a receiving hole (113), the temperature sensor (102) being arranged in the receiving hole (113) and being sealed by a potting compound (114).
5. The apparatus (100) of claim 1, further comprising a current sensor (104) configured to detect a current in the cable (200), wherein the processor (103) is further configured to determine the temperature of the cable joint (201) further based on the current in the cable (200).
6. The apparatus (100) of claim 5, wherein the processor (103) is configured to determine the temperature of the cable joint (201) by:
determining a temperature of the cable joint (201) based on the detected temperature of the adapter (101) and a first relation between the temperature of the cable joint (201) and the temperature of the adapter (101) when an increase of the current in the cable (200) is detected; and
when a decrease in the current in the cable (200) is detected, the temperature of the cable joint (201) is determined based on the detected temperature of the adapter (101) and a second relationship between the temperature of the cable joint (201) and the temperature of the adapter (101), the second relationship being different from the first relationship.
7. The apparatus (100) of claim 5, wherein determining the temperature of the cable joint (201) further based on the current in the cable (200) comprises:
increasing the determined temperature value of the cable joint (201) by a first compensation value when the momentary increase of the current in the cable (200) exceeds a first threshold value; and
reducing the determined temperature value of the cable joint (201) by a second compensation value when the momentary reduction of the current in the cable (200) exceeds a second threshold value.
8. A method (900) for monitoring the temperature of a cable joint (201) of a cable (200) connected to a gas-insulated switchgear (300), comprising:
-detecting the temperature of an adapter (101) by means of a temperature sensor (102) arranged in the adapter (101), the adapter (101) being adapted to be coupled to a cable socket (31) of the switching device (300), the cable socket (31) being provided with a mounting hole (311) for connecting the cable connector (201), the mounting hole (311) being provided at a mounting surface (312), wherein the adapter (101) is located at the mounting surface (312) and outside the mounting hole (311) when coupled to the cable socket (31); and
determining a temperature of the cable joint (201) based on the detected temperature of the adapter (101).
9. The method (900) of claim 8, wherein the cable receptacle (31) includes a threaded hole (313) at the mounting surface (312), and the adapter (101) includes:
a first portion (111) configured as a threaded rod adapted to be inserted into the threaded hole (313); and
a second portion (112) configured for housing the temperature sensor (102).
10. The method (900) according to claim 9, wherein the second portion (112) comprises a receiving hole (113), the temperature sensor (102) being arranged in the receiving hole (113) and being sealed by a potting compound (114).
11. The method (900) of claim 8, further comprising:
detecting a current in the cable (200) by a current sensor (104);
determining a temperature of the cable joint (201) based on the detected temperature of the adapter (101) and a first relation between the temperature of the cable joint (201) and the temperature of the adapter (101) when an increase of the current in the cable (200) is detected; and
when a decrease in the current in the cable (200) is detected, the temperature of the cable joint (201) is determined based on the detected temperature of the adapter (101) and a second relationship between the temperature of the cable joint (201) and the temperature of the adapter (101), the second relationship being different from the first relationship.
12. The method (900) of claim 11, wherein
The first relation is obtained by linear fitting of at least two pairs of temperatures of the cable connector (201) and the adapter (101),
the second relation is obtained by linear fitting of at least three pairs of temperatures of the cable joint (201) and the adapter (101), and
the at least three pairs of temperatures include at least one pair of transient temperatures of the cable joint (201) and the adapter (101).
13. The method (900) of claim 11, wherein determining the temperature of the cable joint (201) further based on the current in the cable (200) comprises:
increasing the determined temperature value of the cable joint (201) by a first compensation value when the momentary increase of the current in the cable (200) exceeds a first threshold value; and
reducing the determined temperature value of the cable joint (201) by a second compensation value when the momentary reduction of the current in the cable (200) exceeds a second threshold value.
14. A gas-insulated switchgear device (300) comprising an arrangement (100) according to any of claims 1 to 7.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2018/078719 WO2019173949A1 (en) | 2018-03-12 | 2018-03-12 | Apparatus and method for monitoring temperature of cable joint of cable connected to gas insulated switchgear |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111602039A true CN111602039A (en) | 2020-08-28 |
| CN111602039B CN111602039B (en) | 2022-12-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201880085354.7A Active CN111602039B (en) | 2018-03-12 | 2018-03-12 | Device and method for monitoring the temperature of a cable joint of a cable connected to a gas-insulated switchgear |
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| Country | Link |
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| EP (1) | EP3765826A4 (en) |
| CN (1) | CN111602039B (en) |
| WO (1) | WO2019173949A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023010456A1 (en) * | 2021-08-05 | 2023-02-09 | Abb Schweiz Ag | Temperature sensing device and switchgear |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114002553A (en) * | 2021-11-01 | 2022-02-01 | 西南交通大学 | Traction power supply 27.5kV cable joint fault identification method |
| CN113884819A (en) * | 2021-11-01 | 2022-01-04 | 西南交通大学 | Cable joint fault positioning system and method for traction power supply system |
| CN116026416B (en) * | 2023-02-24 | 2023-08-15 | 国网江西省电力有限公司电力科学研究院 | Diversified cable joint monitoring devices |
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- 2018-03-12 WO PCT/CN2018/078719 patent/WO2019173949A1/en unknown
- 2018-03-12 CN CN201880085354.7A patent/CN111602039B/en active Active
- 2018-03-12 EP EP18909982.3A patent/EP3765826A4/en active Pending
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| CN102474016A (en) * | 2009-08-04 | 2012-05-23 | Abb(瑞典)股份公司 | Switching device and method for fastening a cable in such switching device |
| CN201917403U (en) * | 2010-12-30 | 2011-08-03 | 常州电子研究所有限公司 | Temperature measuring clamp for cable connector |
| CN104155012A (en) * | 2014-06-17 | 2014-11-19 | 广东安迪普科技有限公司 | Monitoring system capable of displaying temperature rise of cable head on site |
| CN204855025U (en) * | 2015-07-16 | 2015-12-09 | 河北省电力勘测设计研究院 | Be used for cable intermediate head temperature field measuring temperature measurement testing system |
| JP2018017545A (en) * | 2016-07-26 | 2018-02-01 | 山里産業株式会社 | Connecting method of element wire of temperature sensor and extension lead wire, and connecting structure |
| CN206685870U (en) * | 2017-05-15 | 2017-11-28 | 廊坊芳远新合电气有限公司 | Cable connector for below rated voltage 35kV equipment for power transmission and distribution |
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| WO2023010456A1 (en) * | 2021-08-05 | 2023-02-09 | Abb Schweiz Ag | Temperature sensing device and switchgear |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111602039B (en) | 2022-12-27 |
| EP3765826A4 (en) | 2021-11-10 |
| EP3765826A1 (en) | 2021-01-20 |
| WO2019173949A1 (en) | 2019-09-19 |
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