WO2019197038A1 - Switchgear comprising sensors - Google Patents
Switchgear comprising sensors Download PDFInfo
- Publication number
- WO2019197038A1 WO2019197038A1 PCT/EP2018/059540 EP2018059540W WO2019197038A1 WO 2019197038 A1 WO2019197038 A1 WO 2019197038A1 EP 2018059540 W EP2018059540 W EP 2018059540W WO 2019197038 A1 WO2019197038 A1 WO 2019197038A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sensor
- switchgear
- module
- sensor unit
- housing
- 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.)
- Ceased
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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
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/26—Casings; Parts thereof or accessories therefor
- H02B1/30—Cabinet-type casings; Parts thereof or accessories therefor
- H02B1/32—Mounting of devices therein
- H02B1/34—Racks
- H02B1/36—Racks with withdrawable units
Definitions
- WO 201 1 /005 254 A1 discloses a system for monitoring a switchgear.
- At least one physical value is a value of temperature measured by a temperature sensor.
- the sensor unit is connecting temperature sensors to get infor mation about an electrical connection between two conductors. Temperature moni toring can be done at bus bar joints, inside of a module, especially inside of a with drawable module, at incoming and outgoing contacts or at outgoing cable termina tion. Also temperature inside or outside of a switchgear or of a withdrawable module can be detected.
- one information is a position of a device detected by a posi tion sensor.
- the location of a withdrawable module or the number of insertions of modules can be detected.
- Position sensors detect inserted, isolated and/ or removed positions of devices. By this mechanical conditions and electrical connection condi tions can be detected. It is also possible to count insertion cycles of a module, espe cially of a withdrawable module, by a position sensor. So it can be predicted when a module has to be replaced. It can be detected or predicted if power contacts are still sufficient. This makes maintenance easier. It can also be detected if the correct de vice or module is installed in the switchgear or if some components, especially of the module, are missing.
- At least one sensor unit comprises at least one own sensor or sev eral own sensors. So temperature, voltage, current, humidity or position can also be detected by the sensor unit.
- the switchgear comprises a housing and a withdrawable module or plug-in module, whereas the withdrawable module or plug-in module is insertable or inserted in a reversible manner in the housing, whereas the sensor unit is mechani cally attached to the module or to the housing.
- the sensor unit can be installed inside of the module or above the module.
- the sensor unit can be used to monitor the tem perature within the module.
- the sensor unit can be installed outside of a withdrawa- ble or plug-in-module.
- the sensor unit can be installed inside of a cable connection unit.
- the switchgear comprises a housing and a withdrawable module or plug-in module, whereas the withdrawable module or plug-in module is insertable or inserted in a reversible manner in the housing, whereas at least one sensor is mechanically attached to the module or to the housing.
- the sensor unit communicates via serial communication, e.g. Mod- bus, or ethernet communication, e.g. Modbus TCP, OPC UA, https etc., to a monitor ing system.
- Serial communication e.g. Mod- bus
- ethernet communication e.g. Modbus TCP, OPC UA, https etc.
- Condition based and predictive maintenance calculations can be done by the moni toring system.
- a sensor can be connected to the sensor unit by short range RFID.
- Fig. 1 schematically shows a low voltage switchgear, comprising sensors and sensor units connected to the sensors, whereas the sensor units com municate to a monitoring system,
- Fig. 2 schematically shows a withdrawable module which carries a sensor that is connectable to a sensor unit installed in a housing according to Fig. 1 , and
- Fig. 3 schematically shows a withdrawable module, whereas a sensor unit which is installed in the housing is connectable to a sensor also installed in the housing according to Fig. 1.
- At least one physical value is a value of temperature measured by a temperature sensor 2a. At least one physical value is a value of humidity measured by a humidity sensor 2b. One physical value is a value of current or voltage detected by a current or voltage sensor 2c. One information is a position of a device detected by a position sensor 2d.
- the first sensor unit 3a is developed as a separate part which can be added as one assembly to an existing device or to an existing switchgear 1 .
- the sensor unit 3a is developed as a drawer.
- the sensor unit 3a carries a QR-Code or a serial number.
- Fig. 2 schematically shows a switchgear 1 , comprising at least one sensor 2e, whereas one sensor unit 3b is connected to the at least one sensor 2e to get or to read out at least one physical value measured by the at least one sensor 2e.
- Sensor 2e is a further temperature sensor 2e.
- This further temperature sensor 2e is attached to the module 5 or is installed inside of the module 5.
- the sensor unit 3b is connected to the sensor 2e. So are as of high temperature can be detected. Especially areas of high temperature inside of the module 5 can be detected.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Gas-Insulated Switchgears (AREA)
Abstract
A switchgear (1), comprising at least one sensor (2a-e) or several sensors (2a-e), characterized in that at least one sensor unit (3a, 3b) is connected or connectable to at least one sensor (2a-e) or to the sensors (2a-e) to get or to read out at least one physical value measured by at least one sensor (2a-c, 2e) and/ or other information detected by at least one sensor (2d) achieves the object to monitor the condition of a switchgear as broad or extensive as possible to carry out maintenance when needed. This object is also achieved by a method to carry out prédictive maintenance of a switchgear (1).
Description
SWITCHGEAR COMPRISING SENSORS
Description
The invention is related to a switchgear, in particular a low voltage switchgear, com prising at least one sensor or several sensors. The invention is further related to a method for predictive maintenance of a switchgear, comprising at least one sensor or several sensors.
Electrical switchgears are used in power systems to both distribute electrical power and selectively isolate electrical loads. Switchgears are produced in many forms, but typically include a combination of electrical elements such as disconnects, fuses, cir cuit breakers and a main distribution bus. Switchgears are located anywhere electri cal distribution, isolation and/or protection is required. These locations may include, for example, generators, factories, motors, transformers, and substations.
Because a switchgear distributes electrical current, temperature buildup becomes an important characteristic to monitor. In particular, unexpected temperature rise at a particular location could indicate corrosion or some other type of defect. If left uncor rected, this defect could result in catastrophic failure resulting in deactivated loads and potentially hazardous conditions to personnel.
Against this background WO 201 1 /005 254 A1 discloses a system for monitoring a switchgear.
Conventional low voltage switchgears and to a certain extent intelligent low voltage switchgears do not provide information about the conditions of a load feeder or a mo tor starter module that are relevant for maintenance and predictive maintenance cal culations. Such conditions comprise temperature, location, numbers of insertions, numbers of breaker trips etc..
Against this background users are looking for reduction of OPEX (operational ex penditure), which comprise annual maintenance, repair or replacement of compo nents in low voltage switchgears. With industry 4.0 and maintenance 4.0 customers and users are willing to invest in monitoring solutions that provide OPEX reduction.
Current maintenance practice is reactive and preventive. Further maintenance prac tice is time based. Both methods therefore are cost intensive. A repair after failure incures a process shutdown and loss of production. A preventive practice requires regular shutdown periods.
As maintenance should only be done if and where required it should be based on current condition and calculated predictive condition that leads to maintenance needs. Conditions can be identified by monitoring temperatures, current, voltage, voltage drop, humidity and mechanical operations.
In conventional systems no condition information is available. In intelligent systems using electronic protection relays limited information, namely current, voltage, coun ters, is available. This is however not sufficient for a complete condition analysis.
The object of the invention therefore is to monitor the condition of a switchgear as broad or extensive as possible to carry out maintenance when needed.
The object of the invention is achieved by means of the features of claim 1 .
According to this claim at least one sensor unit is connected or connectable to at least one sensor or to several sensors to get or to read out at least one physical val ue measured by at least one sensor and/ or other information detected by at least one sensor.
The object of the invention is achieved also by means of the independent method claim.
According to the invention it has been found that conventional switchgears and to a
certain extent intelligent switchgears, in particular low voltage switchgears and to a certain extent intelligent low voltage switchgears, do not provide information about the conditions of a load feeder or a motor starter module that are relevant for mainte nance and predictive maintenance calculations. Further it has been found that such conditions comprise temperature, location, numbers of insertions, numbers of break er trips etc..
Then it has been found that maintenance should only be done if and where required. Conditions can be identified by monitoring e.g. temperatures, current, voltage, volt age drop, humidity and mechanical operations. Monitoring the condition of a switch- gear as broad or extensive as possible can be realized if devices are used which are already installed in a switchgear or outside of a switchgear. These devices are sen sors. Sensors installed inside a switchgear can be used. Also ambient sensors can be used. According to the invention sensor units may be added to get information about the condition of a switchgear.
Advantageously at least one physical value is a value of temperature measured by a temperature sensor. The sensor unit is connecting temperature sensors to get infor mation about an electrical connection between two conductors. Temperature moni toring can be done at bus bar joints, inside of a module, especially inside of a with drawable module, at incoming and outgoing contacts or at outgoing cable termina tion. Also temperature inside or outside of a switchgear or of a withdrawable module can be detected.
Further advantageously at least one physical value is a value of humidity measured by a humidity sensor. Humidity inside or outside of a switchgear or of a withdrawable module can be detected. Ambient sensors can be used to get information about tem perature and/ or humidity inside or outside of a switchgear or of a withdrawable mod ule. Ambient sensors preferably are attached to the switchgear. Humidity can cause corrosion of devices of the switchgear.
Advantageously one physical value is a value of current or voltage detected by a cur rent or voltage sensor. Current and voltage sensors can detect load conditions and load at trips. Voltage drop sensors can monitor changes in electrical connections
from incoming to outgoing cable termination.
Further advantageously one information is a position of a device detected by a posi tion sensor. The location of a withdrawable module or the number of insertions of modules can be detected. Position sensors detect inserted, isolated and/ or removed positions of devices. By this mechanical conditions and electrical connection condi tions can be detected. It is also possible to count insertion cycles of a module, espe cially of a withdrawable module, by a position sensor. So it can be predicted when a module has to be replaced. It can be detected or predicted if power contacts are still sufficient. This makes maintenance easier. It can also be detected if the correct de vice or module is installed in the switchgear or if some components, especially of the module, are missing.
Advantageously at least one sensor unit comprises at least one own sensor or sev eral own sensors. So temperature, voltage, current, humidity or position can also be detected by the sensor unit.
Further advantageously at least one sensor unit is developed as a separate part which can be added as one assembly to an existing device, preferably to a module, or to an existing switchgear. Through this it is possible to carry out a simple installa tion.
Advantageously at least one sensor unit is developed as a drawer. A drawer can be plugged into an intake and can easily be withdrawn from this intake.
Further advantageously at least one sensor unit carries a QR-Code or a serial num ber. Through this it is possible to identify the sensor unit.
Advantageously the switchgear comprises a housing and a withdrawable module or plug-in module, whereas the withdrawable module or plug-in module is insertable or inserted in a reversible manner in the housing, whereas the sensor unit is mechani cally attached to the module or to the housing. The sensor unit can be installed inside of the module or above the module. The sensor unit can be used to monitor the tem perature within the module. The sensor unit can be installed outside of a withdrawa-
ble or plug-in-module. The sensor unit can be installed inside of a cable connection unit.
Further advantageously the switchgear comprises a housing and a withdrawable module or plug-in module, whereas the withdrawable module or plug-in module is insertable or inserted in a reversible manner in the housing, whereas at least one sensor is mechanically attached to the module or to the housing. Through this it is possible that a module is free from a sensor unit or free from both a sensor unit and a sensor.
Further advantageously the sensor unit is added to a load feeder and/ or to a motor starter. Especially the sensor unit is added to a load feeder and/ or to a motor starter in a low voltage switchgear. For purposes of maintenance of a low voltage switch- gear it is very important to know the conditions of a load feeder or a motor starter.
Advantageously an arrangement comprises a switchgear as described here and a monitoring system or cloud based monitoring system, whereas the sensor unit com municates via serial or Ethernet communication to the monitoring system or cloud based monitoring system. The sensor unit or module sensor is a monitoring unit that is either installed inside of a module or outside of a module and connects to a num ber of sensors to provide the condition information through serial or Ethernet based communication to a condition monitoring system or cloud based monitoring system.
Those sensors can be temperature, humidity, current, voltage and position sensors.
It is also possible that one sensor measures several physical values. It is also possi ble that one sensor measures at least one physical value and detects a position.
Further advantageously the sensor unit is used in low voltage switchgear and/ or mo tor control centers.
Advantageously the sensor unit communicates via serial communication, e.g. Mod- bus, or ethernet communication, e.g. Modbus TCP, OPC UA, https etc., to a monitor ing system.
Condition based and predictive maintenance calculations can be done by the moni toring system. A sensor can be connected to the sensor unit by short range RFID.
In the drawings:
Fig. 1 schematically shows a low voltage switchgear, comprising sensors and sensor units connected to the sensors, whereas the sensor units com municate to a monitoring system,
Fig. 2 schematically shows a withdrawable module which carries a sensor that is connectable to a sensor unit installed in a housing according to Fig. 1 , and
Fig. 3 schematically shows a withdrawable module, whereas a sensor unit which is installed in the housing is connectable to a sensor also installed in the housing according to Fig. 1.
Fig. 1 shows a low voltage switchgear 1 , comprising several sensors 2a-d. A low voltage switchgear 1 is used for voltages smaller than 1 kV.
Two sensor units 3a, 3b are connected to the sensors 2a-d to get or to read out physical values measured by the sensors 2a-c and other information detected by one sensor 2d.
At least one physical value is a value of temperature measured by a temperature sensor 2a. At least one physical value is a value of humidity measured by a humidity sensor 2b. One physical value is a value of current or voltage detected by a current or voltage sensor 2c. One information is a position of a device detected by a position sensor 2d.
The sensors 2a-d communicate to a first sensor unit 3a which is installed as a drawer in the switchgear 1. For a clear view it is shown by broken lines only the connection of sensor 2d to the sensor unit 3a.
This first sensor unit 3a developed as a drawer is installed in a reversible manner in
the switchgear 1 as a separate part. This first sensor unit 3a is an additional unit to be installed in a switchgear 1 or alternatively in a module 5. The first sensor unit 3a is preferably used to monitor the temperature of outgoing contacts or is positioned in a cable connection unit.
The first sensor unit 3a is developed as a separate part which can be added as one assembly to an existing device or to an existing switchgear 1 . The sensor unit 3a is developed as a drawer. The sensor unit 3a carries a QR-Code or a serial number.
The sensors 2a-d also communicate to a second sensor unit 3b which is installed in a fixed manner in the switchgear 1 . This second sensor unit 3b may be fixed on a bottom plate of the housing 4 or in a not shown door.
The switchgear 1 comprises the housing 4 and a withdrawable module 5 or plug-in module 5, whereas the withdrawable module 5 or plug-in module 5 is insertable or in serted in a reversible manner in the housing 4, whereas the second sensor unit 3b is mechanically attached to the housing 4. This is described in detail in Fig. 2. The module 5 is developed as a drawer.
Fig. 1 schematically also shows an arrangement comprising a switchgear 1 and a monitoring system 6, whereas both sensor units 3a, 3b communicate via serial or Ethernet communication to the monitoring system 6.
Fig. 1 schematically also shows an arrangement comprising a switchgear 1 and a cloud based monitoring system 7, whereas both sensor units 3a, 3b communicate via serial or Ethernet communication to the cloud based monitoring system 7.
Fig. 2 schematically shows that the switchgear 1 comprises a housing 4 and a with drawable module 5 or plug-in module 5, whereas the withdrawable module 5 or plug in module 5 is inserted in a reversible manner in the housing 4, whereas the sensor unit 3b is mechanically attached to the housing 4.
Fig. 2 schematically shows a switchgear 1 , comprising at least one sensor 2e, whereas one sensor unit 3b is connected to the at least one sensor 2e to get or to
read out at least one physical value measured by the at least one sensor 2e.
Fig. 2 shows a withdrawable module 5 to be monitored, whereas the sensor unit 3b is installed in a bottom plate above the module 5. Such a part also could be installed in a door of the switchgear 1. The second sensor unit 3b comprises an infrared array (IR array) or a charge coupled device (CCD).
Sensor 2e is a further temperature sensor 2e. This further temperature sensor 2e is attached to the module 5 or is installed inside of the module 5. When the module 5 is inserted into the housing 4 the sensor unit 3b is connected to the sensor 2e. So are as of high temperature can be detected. Especially areas of high temperature inside of the module 5 can be detected.
Fig. 3 shows a switchgear 1 which comprises a housing 4 and a withdrawable mod ule 5 or plug-in module 5, whereas the withdrawable module 5 or plug-in module 5 is inserted in a reversible manner in the housing 4, whereas at least one sensor 2d is mechanically attached to the housing 4.
Fig. 3 shows a withdrawable module 5 to be monitored, whereas the sensor unit 3b is installed in a bottom plate above the module 5. Such a part also could be installed in a door of the switchgear 1. The sensor unit 3b comprises an infrared array (IR array) or a charge coupled device (CCD).
A position sensor 2d is also attached to the housing 4. When the module 5 is inserted into the housing 4 the sensor unit 3b is connected to the sensor 2d. No installation of a sensor unit 3b or sensor 2d within or at the module 5 is necessary.
The module 5 has a LED of colour red, yellow or green in the front plate of the mod ule 5. The module 5 can be installed by a one-button installation to connect to a sen sor or sensor unit. The module 5 is developed as a drawer.
Reference numbers
Claims
1. Switchgear (1 ), comprising at least one sensor (2a-e) or several sensors (2a-e), characterized in that at least one sensor unit (3a, 3b) is connected or con nectable to at least one sensor (2a-e) or to the sensors (2a-e) to get or to read out at least one physical value measured by at least one sensor (2a-c, 2e) and/ or other information detected by at least one sensor (2d).
2. Switchgear according to claim 1 , characterized in that at least one physical val ue is a value of temperature measured by a temperature sensor (2a, 2e).
3. Switchgear according to claim 1 or 2, characterized in that at least one physical value is a value of humidity measured by a humidity sensor (2b).
4. Switchgear according to one of the preceding claims, characterized in that one physical value is a value of current or voltage detected by a current or voltage sensor (2c).
5. Switchgear according to one of the preceding claims, characterized in that one information is a position of a device detected by a position sensor (2d).
6. Switchgear according to one of the preceding claims, characterized in that at least one sensor unit (3a, 3b) comprises at least one own sensor or several own sensors.
7. Switchgear according to one of the preceding claims, characterized in that at least one sensor unit (3a) is developed as a separate part which can be added as one assembly to an existing device or to an existing switchgear (1 ).
8. Switchgear according to one of the preceding claims, characterized in that at least one sensor unit (3a) is developed as a drawer.
9. Switchgear according to one of the preceding claims, characterized in that at least one sensor unit (3a, 3b) carries a QR-Code or a serial number.
10. Switchgear according to one of the preceding claims, characterized in that the switchgear (1 ) comprises a housing (4) and a withdrawable module (5) or plug in module (5), whereas the withdrawable module (5) or plug-in module (5) is in- sertable or inserted in a reversible manner in the housing (4), whereas the sen sor unit (3b) is mechanically attached to the module (5) or to the housing (4).
11. Switchgear according to one of the preceding claims, characterized in that the switchgear (1 ) comprises a housing (4) and a withdrawable module (5) or plug in module (5), whereas the withdrawable module (5) or plug-in module (5) is in- sertable or inserted in a reversible manner in the housing (4), whereas at least one sensor (2d, 2e) is mechanically attached to the module (5) or to the housing (4).
12. Switchgear according to one of the preceding claims, characterized in that the sensor unit (3a, 3b) is added to a load feeder and/ or to a motor starter.
13. Arrangement comprising a switchgear (1 ) according to one of the preceding claims and a monitoring system (6) and/ or a cloud based monitoring system (7), whereas the sensor unit (3a, 3b) communicates via serial or Ethernet com munication to the monitoring system (6) and/ or cloud based monitoring system (7).
14. Method to carry out predictive maintenance of a switchgear (1 ), comprising at least one sensor (2a-e) or several sensors (2a-e), characterized in that at least one sensor unit (3a, 3b) is used which is connected at least one sensor (2a-e) or to the sensors (2a-e) to get or to read out at least one physical value meas ured by at least one sensor (2a-c, 2e) and/ or other information detected by at least one sensor (2d).
15. Method according to the preceding claim, characterized in that an arrangement according to claim 13 is used.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/EP2018/059540 WO2019197038A1 (en) | 2018-04-13 | 2018-04-13 | Switchgear comprising sensors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/EP2018/059540 WO2019197038A1 (en) | 2018-04-13 | 2018-04-13 | Switchgear comprising sensors |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2019197038A1 true WO2019197038A1 (en) | 2019-10-17 |
Family
ID=62025830
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2018/059540 Ceased WO2019197038A1 (en) | 2018-04-13 | 2018-04-13 | Switchgear comprising sensors |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO2019197038A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4006938A1 (en) * | 2020-11-25 | 2022-06-01 | Hitachi Energy Switzerland AG | Monitor for switchgear or circuit breakers |
| EP4345430A1 (en) * | 2022-09-29 | 2024-04-03 | Siemens Aktiengesellschaft | Monitoring of a switchgear assembly |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020005667A1 (en) * | 1996-03-13 | 2002-01-17 | Gunter Ciliox | Energy management system with arrangement to monitor and control heating, bentilating and air conditioning components |
| US20080079436A1 (en) * | 2006-09-29 | 2008-04-03 | Neil Gollhardt | System and method for monitoring a motor control center |
| WO2011005254A1 (en) | 2009-07-08 | 2011-01-13 | Abb Research Ltd | Bus condition monitoring system |
| GB2552447A (en) * | 2016-04-06 | 2018-01-31 | Qhi Group Ltd | Fault monitoring systems and methods for detecting connectivity faults |
-
2018
- 2018-04-13 WO PCT/EP2018/059540 patent/WO2019197038A1/en not_active Ceased
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020005667A1 (en) * | 1996-03-13 | 2002-01-17 | Gunter Ciliox | Energy management system with arrangement to monitor and control heating, bentilating and air conditioning components |
| US20080079436A1 (en) * | 2006-09-29 | 2008-04-03 | Neil Gollhardt | System and method for monitoring a motor control center |
| WO2011005254A1 (en) | 2009-07-08 | 2011-01-13 | Abb Research Ltd | Bus condition monitoring system |
| GB2552447A (en) * | 2016-04-06 | 2018-01-31 | Qhi Group Ltd | Fault monitoring systems and methods for detecting connectivity faults |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4006938A1 (en) * | 2020-11-25 | 2022-06-01 | Hitachi Energy Switzerland AG | Monitor for switchgear or circuit breakers |
| WO2022112448A1 (en) * | 2020-11-25 | 2022-06-02 | Hitachi Energy Switzerland Ag | Monitor for switchgear or circuit breakers |
| EP4345430A1 (en) * | 2022-09-29 | 2024-04-03 | Siemens Aktiengesellschaft | Monitoring of a switchgear assembly |
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