Classifications

• • 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
  • H02B13/0356—Mounting of monitoring devices, e.g. current transformers
• • 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
  • G01K1/02—Means for indicating or recording specially adapted for thermometers
  • G01K1/024—Means for indicating or recording specially adapted for thermometers for remote indication

Definitions

• Embodiments of the present disclosure generally relate to the field of switchgear, and more particularly, to a gas insulated switchgear and a method for use with a gas insulated switchgear.
• Switchgear typically includes various components arranged in an enclosed housing. During operation of the switchgear, the temperatures of the components may rise significantly due to a large current flowing through the components or a loose connection between the components. The temperature rise of the components would adversely affect the performance of the components or even damage the components. Thus, it is necessary to carry out temperature measurement in the switchgear so as to monitor operating conditions of the switchgear in real time.
• a gas insulated switchgear is a kind of conventional switchgear and typically includes a metal gas tank.
• wired type temperature sensors rather than wireless type temperature sensors, are usually employed inside the gas tank, due to the electromagnetic shielding effect of the metal gas tank.
• it is not safe for the GIS to use wired type temperature sensors because the wires could potentially become a short path to ground.
• employing wired type temperature sensors means to set additional openings on the wall of the gas tank for the wires to pass therethrough, which would weaken the sealing property of the GIS.
• wired type sensors usually have a short service life, which would affect the reliability of the GIS.
• various example embodiments of the present disclosure provide a gas insulated switchgear having a wireless measuring device and a wireless transmitter for directly measuring temperature inside a metal gas tank of the GIS in a manner of high safety, no damage to the gas tank, and high reliability.
• example embodiments of the present disclosure provide a gas insulated switchgear.
• the gas insulated switchgear comprises a metal gas tank filled with an insulating gas to provide an insulating media for electrical components of the gas insulated switchgear inside the metal gas tank; a non-metal component arranged on a wall of the metal gas tank and configured to install at least one of the electrical components, one side of the non-metal component being in contact with the insulating gas, and the other side of the non-metal component being in contact with air outside the metal gas tank; a wireless transmitter arranged outside the metal gas tank and configured to transmit a measuring signal; and a wireless measuring device arranged inside the metal gas tank and being capable of wirelessly communicating with the wireless transmitter via the non-metal component, the wireless measuring device being configured to detect a temperature inside the metal gas tank in response to receiving the measuring signal from the wireless transmitter, and transmit the detected temperature to the wireless transmitter.
• the internal temperature of the metal gas tank detected by the wireless measuring device can be transmitted to the wireless transmitter arranged outside the metal gas tank via the non-metal component arranged on the wall of the metal gas tank. In this way, there is no need to set additional openings on the wall of the gas tank for the wires to pass therethrough, and thus the safety of the GIS can be improved.
• the wireless transmitter comprises an RFID antenna.
• the wireless signals can be transferred between the wireless transmitter and the wireless measuring device via the RFID antenna reliably.
• the wireless measuring device comprises a RFID tag.
• the RFID tag is a passive device without need of an additional power supply.
• the size of the temperature device can be decreased and the safety of the GIS would be further improved.
• the RFID tag could communicate with the RFID antenna by using a signal containing an individual ID, and thus the signals from different RFID tags can be distinguished from each other easily.
• the non-metal component comprises an epoxy part of an epoxy current transformer.
• the current transformer can measure a current inside the GIS.
• the wireless signals can be transferred through the epoxy current transformer reliably and there is no need to set additional openings on the wall of the gas tank.
• the non-metal component comprises an epoxy part of an epoxy cable busing or an epoxy busbar bushing.
• the wireless signals can be transferred through the epoxy cable busing or the epoxy busbar bushing reliably and there is no need to set additional openings on the wall of the gas tank.
• the wireless measuring device is arranged adjacent to a connection point between a copper bar and an inner cone cable socket. With these embodiments, the loose connection between the copper bar and the inner cone cable socket can be monitored in real time.
• the wireless measuring device is arranged adjacent to a connection point between a copper bar and an outer cone cable busing or an outer cone busbar busing. With these embodiments, the loose connection between the copper bar and the outer cone cable busing or the outer cone busbar busing can be monitored in real time.
• example embodiments of the present disclosure provide a method for use with a gas insulated switchgear.
• the gas insulated switchgear comprises: a metal gas tank filled with an insulating gas to provide an insulating media for electrical components of the gas insulated switchgear inside the metal gas tank; a non-metal component arranged on a wall of the metal gas tank and configured to install at least one of the electrical components, one side of the non-metal component being in contact with the insulating gas, and the other side of the non-metal component being in contact with air outside the metal gas tank; a wireless transmitter arranged outside the metal gas tank and configured to transmit a measuring signal; and a wireless measuring device arranged inside the metal gas tank and being capable of wirelessly communicating with the wireless transmitter via the non-metal component, the wireless measuring device being configured to detect a temperature inside the metal gas tank in response to receiving the measuring signal from the wireless transmitter, and transmit the detected temperature to the wireless transmitter.
• the method comprises receiving, by the wireless measuring device, a measuring signal from the wireless transmitter; detecting, by the wireless measuring device, a temperature inside the metal gas tank in response to receiving the measuring signal from the wireless transmitter; and transmitting, by the wireless measuring device, the detected temperature to the wireless transmitter.
• the wireless transmitter comprises an RFID antenna.
• the wireless measuring device comprises an RFID tag.
• the non-metal component comprises an epoxy part of an epoxy current transformer.
• the non-metal component comprises an epoxy part of an epoxy cable busing or an epoxy busbar bushing.
• the wireless measuring device is arranged adjacent to a connection point between a copper bar and an inner cone cable socket.
• the wireless measuring device is arranged adjacent to a connection point between a copper bar and an outer cone cable busing or an outer cone busbar busing.
• FIG. 1 is a schematic view illustrating a GIS in accordance with an embodiment of the present disclosure
• FIG. 2 is a schematic view illustrating a GIS including an inner cone cable socket in accordance with an embodiment of the present disclosure
• FIG. 3 is a schematic view illustrating a GIS including an outer cone busbar bushing and an outer cone cable bushing in accordance with an embodiment of the present disclosure.
• FIG. 4 is a flow diagram of a method for use with a GIS in accordance with an embodiment of the present disclosure.
• the term “comprises” or “includes” and its variants are to be read as open terms that mean “includes, but is not limited to. ”
• the term “or” is to be read as “and/or” unless the context clearly indicates otherwise.
• the term “based on” is to be read as “based at least in part on. ”
• the term “being operable to” is to mean a function, an action, a motion or a state that can be achieved by an operation induced by a user or an external mechanism.
• the term “one embodiment” and “an embodiment” are to be read as “at least one embodiment. ”
• the term “another embodiment” is to be read as “at least one other embodiment. ”
• the terms “first, ” “second, ” and the like may refer to different or same objects. Other definitions, explicit and implicit, may be included below. A definition of a term is consistent throughout the description unless the context clearly indicates otherwise.
• a wireless transmitter and a wireless measuring device are used in the GIS so as to realize the direct temperature measuring inside a metal gas tank of a GIS without arranging additional openings on the wall of the metal gas tank.
• the above idea may be implemented in various manners, as will be described in detail in the following paragraphs.
• FIG. 1 is a schematic view illustrating a GIS in accordance with an embodiment of the present disclosure.
• the GIS 1 generally includes a metal gas tank 101, a non-metal component 102, a wireless transmitter 103, and a wireless measuring device 104.
• the metal gas tank 101 together with the non-metal component 102, form an enclosed space filled with an insulating gas, for example, SF 6 or other kinds of gases, so as to provide a high voltage level insulating performance.
• an insulating gas for example, SF 6 or other kinds of gases.
• the connection points of the electrical components are potential sources of failure. Thus, the temperatures of these positions need to be monitored.
• the metal gas tank 101 is made of stainless steel. In other embodiments, the metal gas tank 101 is made of other metal material, such as Aluminum. The scope of the present disclosure is not intended to be limited in this respect.
• the non-metal component 102 is arranged on a wall of the metal gas tank 101, and configured to install at least one of the electrical components. One side of the non-metal component 102 is in contact with the insulating gas inside the metal gas tank 101, and the other side of the non-metal component 102 is in contact with air outside the metal gas tank 101.
• the non-metal component 102 is made of epoxy.
• the non-metal component 102 is an epoxy part of an epoxy current transformer, an epoxy cable busing, or an epoxy busbar bushing.
• the non-metal component 102 may be made of other non-metal materials. The scope of the present disclosure is not intended to be limited in this respect.
• the electrical components installed on the non-metal components 102 may be those components that already exist on the wall of the metal gas tank in the conventional GIS. Those components are used to implement specific functions, for example, to measure the current, to deliver the power into the gas tank, and so on. Thus, there is no need to set additional openings on the wall of the metal gas tank 101 for wires to pass therethrough, and thus the safety of the GIS 1 can be improved.
• the wireless transmitter 103 is arranged outside the metal gas tank 101 and configured to transmit a measuring signal to the wireless measuring device 104.
• the wireless transmitter 103 is arranged near to the non-metal component 102 to provide a better communication with the wireless measuring device 104.
• the wireless transmitter 103 is arranged in a cable compartment (not shown) outside the metal gas tank 101. In other embodiments, the wireless transmitter 103 can be arranged in other places outside the metal gas tank 101, for example, on top of the GIS 1. The scope of the present disclosure is not intended to be limited in this respect.
• the wireless transmitter 103 includes an RFID antenna.
• the wireless transmitter 103 may include components suitable for transferring signals according to other communication protocols, for example, Zigbee, SAW, and so on. The scope of the present disclosure is not intended to be limited in this respect.
• the wireless measuring device 104 is arranged inside the metal gas tank 101 and is capable of wirelessly communicating with the wireless transmitter 103 via the non-metal component 102.
• the wireless measuring device 104 is configured to detect a temperature inside the metal gas tank 101 in response to receiving the measuring signal from the wireless transmitter 103, and transmit the detected temperature to the wireless transmitter 103.
• a plurality of wireless measuring devices 104 may be provided inside the metal gas tank 101 to measure the temperatures at different positions inside the metal gas tank 101. However, it is to be understood that in other embodiments, only one wireless measuring device 104 may be provided inside the metal gas tank 101 to measure the temperature at a certain position. The scope of the present disclosure is not intended to be limited in this respect.
• the wireless measuring device 104 may be arranged on or adjacent to connection points of the electrical components, for example, the connection points between copper bars and inner cone cable sockets, the connection points between copper bars and outer cone cable bushings, or the connection points between copper bars and outer cone busbar bushings. With such arrangements, the temperature rise caused by the loose connection of the electrical components can be monitored precisely.
• the wireless measuring device 104 may be arranged on or adjacent to other electrical components that need to be monitored, for example, the electrical switches circuit breaker, three position switches and so on. This allows the real-time measuring of the temperature rise caused by the large current flowing through these electrical components.
• wireless measuring device 104 includes an RFID tag.
• the wireless measuring device 104 may include components suitable for transferring signals according to other communication protocols, for example, Zigbee, SAW, and so on. The scope of the present disclosure is not intended to be limited in this respect.
• the wireless temperature measuring inside the metal gas tank of the GIS can be achieved.
• the GIS of the present disclosure has no additional openings on the wall of the metal gas tank and has no wire inside the metal gas tank. Accordingly, the direct temperature measuring inside the metal gas tank of the GIS can be achieved in a manner of high safety, no damage, and high reliability.
• FIG. 2 is a schematic view illustrating a GIS including an inner cone cable socket
• FIG. 3 is a schematic view illustrating a GIS including an outer cone busbar bushing and an outer cone cable bushing.
• the construction of the GIS 1 as shown in FIGS. 2 and 3 are similar to that of the GIS 1 as shown in FIG. 1. The differences between them will be described herein, and the same parts will not be described in detail any more.
• the GIS 1 generally includes a metal gas tank 101, an epoxy current transformer 102A, a RFID antenna 103A, RFID tags 104A, inner cone cable sockets 106 and a copper bar 105.
• the RFID tags 104A are arranged on the connection point between the inner cone cable sockets 106 and the copper bar 105.
• the epoxy current transformer 102A is arranged on the wall of the metal gas tank 101 to measure the current.
• the RFID antenna 103A transmits a measuring signal.
• the measuring signal passes through the epoxy part of the epoxy current transformer 102A and arrives at the RFID tag 104A.
• the RFID tag 104A draws the energy needed for its operation from a magnetic field provided by the RFID antenna 103A.
• a power of several dozen to hundreds of microwatts can be used inside the RFID tag 104A.
• the RFID tag 104A measures the temperature of the connection point, and transmits the detected temperature to the RFID antenna 103A through the epoxy part of the epoxy current transformer 102A.
• the GIS 1 generally includes a metal gas tank 101, an outer cone busbar bushing 102B, an outer cone cable bushing 102C, a RFID antenna 103A, RFID tags 104A, copper bars 105.
• the RFID tags 104A are arranged on the connection point between the outer cone busbar bushing 102B and the copper bar 105 and the connection point between the outer cone cable bushing 102C and the copper bar 105.
• the outer cone busbar busing 102B and outer cone cable bushing 102C are arranged on the wall of the metal gas tank 101 to feed power inside the metal gas tank 101, and are casted by epoxy.
• the RFID antenna 103A transmits a measuring signal.
• the measuring signal passes through the epoxy part of the outer cone busbar bushing 102B and the epoxy part of the outer cone cable bushing 102C and arrives at the RFID tag 104A.
• the remaining steps of the temperature measuring are the same as those in FIG. 2.
• each RFID tag 104A has an individual ID corresponding to a specific connection point in the GIS 1, and the output signal of the RFID tag 104A indicates the temperature of the corresponding connection point and contains the individual ID.
• the RFID antenna 103A receives the output signal from the RFID tag 104A, the wireless transmitter 103 will recognize which connection point the temperature belongs to. Accordingly, by using the RFID antenna and the RFID tag, the temperature measuring is achieved with a higher efficiency.
• the RFID tag 104A is a passive device without need of an additional power supply.
• the size of the temperature device can be decreased and the safety of the GIS would be further improved.
• FIG. 4 is a flow diagram of a method for use with a GIS in accordance with an embodiment of the present disclosure.
• the method in FIG. 4 can be applied to any GIS of the present disclosure.
• the method comprises a step of receiving, by the wireless measuring device, a measuring signal from the wireless transmitter via a non-metal component arranged on a wall of the metal gas tank.
• the type of the measuring signal depends on the type of the wireless transmitter.
• the measuring signal is a RFID signal.
• the measuring signal can be other types of wireless signals, for example, Zigbee signal, SAW signal, and so on. The scope of the present disclosure is not intended to be limited in this respect.
• the method comprises a step of detecting, by the wireless measuring device, a temperature inside the metal gas tank in response to receiving the measuring signal from the wireless transmitter.
• a temperature inside the metal gas tank in response to receiving the measuring signal from the wireless transmitter.
• more than one position inside the metal gas tank needs to be measured. After the temperatures of these positions are measured, the measured temperatures are stored in the wireless measuring device along with different IDs in order to distinguish them from each other.
• the method comprises a step of transmitting, by the wireless measuring device, the detected temperature to the wireless transmitter.
• the detected temperature is transmitted along with an individual ID in order to distinguish them from each other, wherein the IDs correspond to different positions.
• inventive embodiments are presented by way of example only and that, within the scope of the appended claims and equivalents thereto, inventive embodiments may be practiced otherwise than as specifically described and claimed.
• inventive embodiments of the present disclosure are directed to each individual feature, system, article, material, kit, and/or method described herein.

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• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Gas-Insulated Switchgears (AREA)
• Arrangements For Transmission Of Measured Signals (AREA)

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• 2021
  • 2021-01-15 EP EP21918593.1A patent/EP4278159A4/en active Pending
  • 2021-01-15 CN CN202180090554.3A patent/CN116724219A/zh active Pending
  • 2021-01-15 WO PCT/CN2021/072258 patent/WO2022151389A1/en active Application Filing

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