WO2023236134A1 - Device and method for detection and monitoring of circuit breaker - Google Patents
Device and method for detection and monitoring of circuit breaker Download PDFInfo
- Publication number
- WO2023236134A1 WO2023236134A1 PCT/CN2022/097800 CN2022097800W WO2023236134A1 WO 2023236134 A1 WO2023236134 A1 WO 2023236134A1 CN 2022097800 W CN2022097800 W CN 2022097800W WO 2023236134 A1 WO2023236134 A1 WO 2023236134A1
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- WO
- WIPO (PCT)
- Prior art keywords
- circuit breaker
- high speed
- speed circuit
- electronic module
- contact
- Prior art date
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 22
- 238000001514 detection method Methods 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000005540 biological transmission Effects 0.000 claims abstract description 9
- 238000005259 measurement Methods 0.000 claims description 15
- 238000004891 communication Methods 0.000 claims description 8
- 230000003287 optical effect Effects 0.000 claims description 8
- 238000012545 processing Methods 0.000 claims description 7
- 101001080292 Homo sapiens Iron-sulfur cluster co-chaperone protein HscB Proteins 0.000 claims 1
- 102100027530 Iron-sulfur cluster co-chaperone protein HscB Human genes 0.000 claims 1
- 238000012423 maintenance Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- LXKCHCXZBPLTAE-UHFFFAOYSA-N 3,4-dimethyl-1H-pyrazole phosphate Chemical compound OP(O)(O)=O.CC1=CNN=C1C LXKCHCXZBPLTAE-UHFFFAOYSA-N 0.000 description 1
- 241001541997 Allionia Species 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
- H01H11/0062—Testing or measuring non-electrical properties of switches, e.g. contact velocity
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/02—Details
- H01H33/59—Circuit arrangements not adapted to a particular application of the switch and not otherwise provided for, e.g. for ensuring operation of the switch at a predetermined point in the ac cycle
- H01H33/596—Circuit arrangements not adapted to a particular application of the switch and not otherwise provided for, e.g. for ensuring operation of the switch at a predetermined point in the ac cycle for interrupting dc
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/04—Means for indicating condition of the switching device
- H01H2071/048—Means for indicating condition of the switching device containing non-mechanical switch position sensor, e.g. HALL sensor
Abstract
A device for detection and monitoring of circuit breaker for use with a high speed circuit breaker, comprises a laser sensor and an electronic module, wherein a laser output of the laser sensor is configured to be in axial alignment with a contact shaft of the high speed circuit breaker; the electronic module is configured to perform signal treatment, analysis and/or transmission; and the laser sensor is an input of the electronic module. A contact wear indicator and methods for detecting position, measuring opening and closing speed and measuring contact wear of the high speed circuit breaker.
Description
The present application relates to the field of circuit breaker, and more particularly, to device and method for detection and monitoring of circuit breaker.
Background Art
Any background information described herein is intended to introduce the reader to various aspects of art, which may be related to the present embodiments that are described below. This discussion is believed to be helpful in providing the reader with background information to facilitate a better understanding of the various aspects of the present disclosure. Accordingly, it should be understood that these statements are to be read in this light.
As generally known, a circuit breaker is a type of an electric apparatus for protecting circuits from damage caused by over-current or overload or short circuit. Its basic function is to interrupt current flow when it senses that an electric circuit is manually switched on or off or a fault current, such as a short-circuit current, occurs.
High Speed Circuit Breakers (HSCB) are single-pole, high-speed circuit breakers designed for use in high energy and high reliability DC power distribution systems. These systems are mostly present in DC traction substation, DC Drives power and any other DC power application such as wind mills, solar farms, datacenters, high voltage direct current transmission, etc.
DC traction substation integrate a DC High Speed Circuit Breaker (HSCB) which is the core power protection device. These HSCB are opening and closing based on operator’s orders and electrical default. Current detection and monitoring of HSCB has the following disadvantages:
- The HSCB position is only given by itself to the control and monitoring systems, therefore the HSCB is giving itself information on its positions. If the HSCB has a major default and breaks down, no information from its own components can be reliable.
- The opening and closing speed of the HSCB are not directly measured so far but only deducted from the electrical opening and closing time, which includes the arc cutting time and is different from the mechanical opening and closing time. The mechanical opening and closing time is the actual time for the contact to move and settle from one position to the other.
- No information is available about the HSBC contact wear, which implies regular preventive maintenance. The contacts have to be replaced when they reach a minimum dimension. In order to measure this dimension, the operator needs to open the HSCB regularly and measure manually which takes a lot of downtime for the systems as well as maintenance resource time.
- No information is available digitally on a communication bus to be available in fastest time to the control centers, digitally and remotely. The existing information is available locally with analog signals and needs to be relayed digitally with gateways which greatly decreases the MTBF (Mean Time between Failures) .
Summary of the Invention
For the purpose of overcoming the above shortcomings, the present application provides the following schemes:
In one aspect of the present invention, a device for detection and monitoring of circuit breaker for use with a high speed circuit breaker is provided, comprising a laser sensor and an electronic module, wherein the laser output of the laser sensor is configured to be in axial alignment with a contact shaft of the high speed circuit breaker; the electronic module is configured to perform signal treatment, analysis and/or transmission; and the laser sensor is an input of the electronic module. Such configuration enables that the device for detection and monitoring of circuit breaker and the high speed circuit breaker are not mechanically or electrically connected, both of which are isolated and ensure a protection priority in case of malfunction of one either part.
According to a further preferred embodiment, the electronic module of the device for detection and monitoring of circuit breaker is configured to build and provide a log file with at least one of the following: time stamp, opening time/closing time, time open until next closing, time closed until next opening, opening speed, closing speed, contact wear value, status, information out of range, tolerances (upper/lower) for each position, calibration time and data.
According to a further preferred feature, the laser sensor is installed on the HSCB trolley. The sensor can be installed on a fixed steel or aluminum profile that is fixed and calibrated on the trolley. The calibration process is provided by the manufacturer of the device for HSCB detection and monitoring.
According to a particular embodiment, the device for detection and monitoring of circuit breaker comprises at least one digital communication bus, which can be local bus and/or Ethernet bus, so as to enable all the processed information on digital communication buses to reach the control system in fastest time bypassing any other device which greatly increases the MTBF.
In another aspect of the present invention, a position indicator for use with a high speed circuit breaker is provided, comprising a laser sensor and an electronic module, wherein the laser output of the laser sensor is configured to be in axial alignment with a contact shaft of the high speed circuit breaker; the electronic module is configured to perform signal treatment, analysis and/or transmission; the laser sensor is the input of the electronic module; the position indicator is configured to measure distance of the contact shaft, and the electronic module is configured to process the measurements and define the position of the high speed circuit breaker.
In another aspect of the present invention, a contact wear indicator for use with a high speed circuit breaker is provided, comprising a laser sensor and an electronic module, wherein the laser output of the laser sensor is configured to be in axial alignment with a contact shaft of the high speed circuit breaker; the electronic module is configured to perform signal treatment, analysis and/or transmission; the laser sensor is the input of the electronic module; the contact wear indicator is configured to measure contact dimension via the contact shaft and generate a warning signal when the wear value is closing and/or an alarm when maximum acceptable value for wear is reached.
According to a further aspect of the present invention, a method for detecting position of a high speed circuit breaker is provided, comprising the steps of:
a. installing the devices as described above to the high speed circuit breaker such that the optical output of the contactless sensor is in axial alignment with the contact shaft of the high speed circuit breaker;
b. measuring distance of the contact shaft which indicates the position of the high speed circuit breaker.
c. the electronic module algorithm processing the measurements and defining the position of the high speed circuit breaker based on the reference data input at the time of calibration.
In another aspect of the present invention, a method for measuring opening and closing speed of a high speed circuit breaker is provided, comprising the steps of:
a. installing the devices as described above to the high speed circuit breaker such that the optical output of the contactless sensor is in axial alignment with the contact shaft of the high speed circuit breaker;
b. measuring the opening and closing speed with the high speed circuit breaker mechanical motion according to the speed of the laser frequency.
c. the electronic module algorithm processing the measurements and defining the opening and closing speed of the high speed circuit breaker.
In still another aspect of the present invention, a method for measuring contact wear of a high speed circuit breaker is provided, comprising the steps of:
a. installing the devices as described above to the high speed circuit breaker such that the optical output of the contactless sensor is in axial alignment with the contact shaft of the high speed circuit breaker;
b. measuring contact dimension via the contact shaft which changes according to the contact wear;
c. the electronic module algorithm processing the measurements evolution based on time and defining the contact wear of the high speed circuit breaker.
By adoption of the above-mentioned technical schemes, the present application has the beneficial effects as follows:
The invention detects directly the HSBC positions with an independent system which is not mechanically or electrically connected.
The invention measures the opening and closing speed with the HSCB mechanical motion -from one position to the other.
The invention can measure the contact dimension directly on it via its shaft and can provide warning and alarms depending on the wear level. It can also provide wear statistics.
The invention can make all the processed information on digital communication buses (local bus and/or Ethernet bus) to let the information reach the control system in fastest time bypassing any other device which greatly increases the MTBF.
The invention builds log event files to track record all activities linked to the HSCB with all related data and time stamp. The log files are available on supervision interface.
The invention builds curves of opening and closing courses to better analyze the acceleration and time of motion. The files of the curves are available on supervision interface.
These and other features, aspects and advantages of the present invention will become better understood with reference to the following drawings, description, and claims.
The followings will describe some embodiments of the present invention in detail in an exemplary rather than restrictive manner with reference to the accompanying drawings. The same reference signs in the drawings represent the same or similar components or parts. Those skilled in the art shall understand that these drawings are only schematic ones of the present invention, and may not be necessarily drawn according to the scales. In the drawings:
Fig. 1 shows a plan view of the device for detection and monitoring of circuit breaker together with a high speed circuit breaker according to one embodiment of the present invention;
Fig. 2 shows an enlarged view of the laser sensor and contact shaft according to one embodiment of the present invention;
Fig. 3 shows a schematic view of the device for detection and monitoring of circuit breaker according to one embodiment of the present invention;
Fig. 4a shows a stereogram of the electronic module of the device for detection and monitoring of circuit breaker according to one embodiment of the present invention;
Fig. 4b shows a top view of the electronic module of the device for detection and monitoring of circuit breaker according to one embodiment of the present invention;
Fig. 5 shows a schematic view of the contact wear in a high speed circuit breaker according to one embodiment of the present invention.
Reference Signs List:
1-laser sensor 2-laser beam 3-contact shaft 4-closing device 5-fork 6-moving contact 7-fixed contact 8-direct release rod 9-pusher 10-auxiliary contact 11-arc chute 12-horn 13-baffles 14-de-ionizing plates 15-contact wear
A further detailed description will be made to the present application in combination with test cases and specific implementation modes as follows. The description is not to be taken in a limiting sense, but is made merely for the purpose of illustrating the general principles of the invention, since the scope of the invention is best defined by the appended claims. Technologies implemented on the basis of contents of the present application shall all fall within the scope of the present application.
The device for detection and monitoring of circuit breaker described herein is suitable for use with a high speed circuit breaker, especially a DC High speed circuit breaker mostly present in DC traction substation. The device shall be compatible with the HSCB available in the market, for example, Secheron UR, ABB GE Rapid, Hawkker Siddley, WHZZ, Meiden, Entec, Micoelettrica, and so on. In this embodiment, a DC High speed circuit breaker from Secheron UR up to 3.6KV is used to illustrate the working mechanism of the device for detection and monitoring of circuit breaker in accordance with the present invention.
Referring now to Fig. 1 which shows the device for detection and monitoring of circuit breaker together with a DC High speed circuit breaker. First, let us see how does a typical DC High speed circuit breaker work. When a closing pulse is received, a closing device 4 moves a fork 5, which closes a moving contact 6 and applies a contact pressure to the main contacts (moving contact 6 and fixed contact 7) . A pusher 9, pushed by the moving contact 6, actuates the auxiliary contacts 10. Once the main contact is closed, the contact pressure is maintained by the closing device 4. The circuit breaker opens either through an over-current release or through an appropriate opening order: when an over-current exceeds the maximum current setting value, it causes the direct release rod 8 to move up, which lifts the fork 5, thus releasing the moving contact 6; when an opening order is received, it causes the fork 5 to retract. The pusher 9 then opens the moving contact 6 and actuates the auxiliary contacts 10. The arc generated between the main contacts (moving contact 6 and fixed contact 7) moves upwards between the horns 12 into the arc chute 11 and is split by the baffles 13. The ionized gases are mostly neutralized between the de-ionizing plates 14.
The device for detection and monitoring of circuit breaker in accordance with the present invention mainly comprises two parts: a laser sensor and an electronic module. As shown in Figs. 1 and 2, a laser sensor 1 is configured in such a way that the laser output (laser beam 2) is in axial alignment with a contact shaft 3 of the high speed circuit breaker. The contact shaft 3 is moving laterally/horizontally with the moving contact 6 in the course of opening and closing, which undergoes a horizontal linear motion. The position of the HSCB (Open, close, IDS, intermediate position) can be determined by measuring the distance of the contact shaft using the laser sensor, followed by the electronic module algorithm processing the measurements and defining the position of the HSCB based on the reference data input at the time of calibration. The value (or value range) for each of the position depends on each HSCB type. The values as reference are input manually in the algorithm at the time of calibration.
As schematically shown in Fig. 3, laser triangle reflection measurement is applied which has extremely high measurement accuracy. It can measure the object at a distance and adapt to the precise measurement components with small structure. The laser sensor mainly comprises a laser diode, a sensor CDD/CMOS and a signal receiver. Specifically in this embodiment, the laser sensor of Panasonic HG-C1100 is applied, with a laser frequency of 1.5mS, a measurement center distance of 100 mm and a measuring range of 65-135mm. The measuring of the distance of the contact shaft can reach a precision of 0.1%of full stroke (Resolution 0.01mm) . Besides Panasonic HG-C1100, some other laser sensor model may also be applied, for example, Micro-Epsilon type 1420.
The laser sensor can be installed on a fixed steel/aluminum profile that can be fixed and calibrated on the HSCB trolley. The calibration process is provided by the manufacturer of the device for HSCB detection and monitoring. The electronic module with signal treatment, analysis and/or transmission can be installed in the low voltage compartment of a switchgear or on the HSCB trolley. The electronic module input shall be the laser sensor, and the electronic module output shall be 0-5V contact relay signal and digital buses. A relay output shall be in place for alarm in case of default or power off.
The device in accordance with the present invention comprises at least one digital communication bus, which can be local bus and/or Ethernet bus:
a. Modbus TCP for local settings/monitoring/calibration/log download.
b. Ethernet (MBNET) for DCS and remote control room networks.
One connection should be able to access all systems in a same network (one full substation) .
The device is able to provide industry 4.0 digital communication to connect directly to the control center Scada with a digital communication bus in fastest time bypassing any other device which greatly increases the MTBF.
The device in accordance with the present invention is able to measure opening and closing speed of a high speed circuit breaker. First installing the device to the high speed circuit breaker such that the optical output of the contactless sensor is in axial alignment with the contact shaft of the high speed circuit breaker; then measuring the opening and closing speed with the high speed circuit breaker mechanical motion according to the speed of the laser frequency (1.5mS for Panasonic HG-C1100) ; the electronic module algorithm will then process the measurements and define the opening and closing speed of the high speed circuit breaker. The opening and closing speed of the HSCB are not directly measured so far but only deducted by the electrical opening time, which is different from the mechanical opening time. By applying the device as described herein, the mechanical opening and closing time which is the actual time for the contact to move and settle from one position to the other can be measured with a precision of 0.5ms.
Referring now to Fig. 5, which shows a schematic view of the contact wear in a high speed circuit breaker. The contacts are made of copper and get worn (see contact wear 15) after multiple opening, once worn the contacts require maintenance and replacement.
The device in accordance with the present invention is able to measure contact wear of a high speed circuit breaker. First installing the device to the high speed circuit breaker such that the optical output of the contactless sensor is in axial alignment with the contact shaft of the high speed circuit breaker; then measuring contact dimension via the contact shaft which changes according to the contact wear; the electronic module algorithm will then process the measurements evolution based on time and define the contact wear of the high speed circuit breaker. The device will generate a warning signal when the wear value is closing and/or an alarm when maximum acceptable value for wear is reached. In such a way, it is able to measure dynamically in time the wear of the contacts and provide warning and alarms when wear is over manufacturer recommended limit.
The measurement of contact wear may have three statuses: good/used 75%/Worn. A wear contact alarm can be obtained through register on modbus tcp, message on Ethernet server and/or specific color on status LED (A LED RGB or several LEDs configured on the electronic module to indicate the LED status) .
The electronic module of the device (as shown in Fig. 4a and 4b) is able to build and provide a log file with at least one of the following: time stamp, opening time/closing time, time open until next closing, time closed until next opening, opening speed, closing speed, contact wear value, status, information out of range, tolerances (upper/lower) for each position, calibration time and data.
The electronic module shall have the following parameters adjustable via a PC/mobile software and/or hardware connections (USB TypeC, Bus, Bluetooth, or similar) :
Closed positions dimension -mm
Open positions dimension -mm
Coil course (from open to close) -mm
Contact wear warning -mm
Contact wear alarm -mm
Speed of the course -mm/s.
It should be understood, of course, that the foregoing relates to preferred embodiments of the invention and that modifications may be made without departing from the spirit and scope of the invention as set forth in the following claims.
Claims (10)
- A device for detection and monitoring of circuit breaker for use with a high speed circuit breaker, characterized by comprising a laser sensor and an electronic module, wherein the laser output of the laser sensor is configured to be in axial alignment with a contact shaft of the high speed circuit breaker; the electronic module is configured to perform signal treatment, analysis and/or transmission; and the laser sensor is an input of the electronic module.
- The device according to claim 1, characterized in that the device and the high speed circuit breaker are not mechanically or electrically connected.
- The device according to claim 1, characterized in that the electronic module of the device is configured to build and provide a log file with at least one of the following: time stamp, opening time/closing time, time open until next closing, time closed until next opening, opening speed, closing speed, contact wear value, status, information out of range, tolerances for each position, calibration time and data.
- The device according to claim 1, characterized in that the laser sensor is installed on a HSCB trolley.
- The device according to claim 1, characterized in that the device comprises at least one digital communication bus.
- A position indicator for use with a high speed circuit breaker, characterized by comprising a laser sensor and an electronic module, wherein the laser output of the laser sensor is configured to be in axial alignment with a contact shaft of the high speed circuit breaker; the electronic module is configured to perform signal treatment, analysis and/or transmission; the laser sensor is the input of the electronic module; the position indicator is configured to measure distance of the contact shaft, and the electronic module is configured to process the measurements and define the position of the high speed circuit breaker.
- A contact wear indicator for use with a high speed circuit breaker, characterized by comprising a laser sensor and an electronic module, wherein the laser output of the laser sensor is configured to be in axial alignment with a contact shaft of the high speed circuit breaker; the electronic module is configured to perform signal treatment, analysis and/or transmission; the laser sensor is the input of the electronic module; the contact wear indicator is configured to measure contact dimension via the contact shaft and generate a warning signal when the wear value is closing and/or an alarm when maximum acceptable value for wear is reached.
- A method for detecting position of a high speed circuit breaker, comprising the steps of:a. installing the device according to any one of claims 1-5 to the high speed circuit breaker such that the optical output of the contactless sensor is in axial alignment with the contact shaft of the high speed circuit breaker;b. measuring distance of the contact shaft which indicates the position of the high speed circuit breaker;c. the electronic module algorithm processing the measurements and defining the position of the high speed circuit breaker based on the reference data input at the time of calibration.
- A method for measuring opening and closing speed of a high speed circuit breaker, comprising the steps of:a. installing the device according to any one of claims 1-5 to the high speed circuit breaker such that the optical output of the contactless sensor is in axial alignment with the contact shaft of the high speed circuit breaker;b. measuring the opening and closing speed with the high speed circuit breaker mechanical motion according to the speed of the laser frequency;c. the electronic module algorithm processing the measurements and defining the opening and closing speed of the high speed circuit breaker.
- A method for measuring contact wear of a high speed circuit breaker, comprising the steps of:a. installing the device according to any one of claims 1-5 to the high speed circuit breaker such that the optical output of the contactless sensor is in axial alignment with the contact shaft of the high speed circuit breaker;b. measuring contact dimension via the contact shaft which changes according to the contact wear;c. the electronic module algorithm processing the measurements evolution based on time and defining the contact wear of the high speed circuit breaker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2022/097800 WO2023236134A1 (en) | 2022-06-09 | 2022-06-09 | Device and method for detection and monitoring of circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2022/097800 WO2023236134A1 (en) | 2022-06-09 | 2022-06-09 | Device and method for detection and monitoring of circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2023236134A1 true WO2023236134A1 (en) | 2023-12-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/CN2022/097800 WO2023236134A1 (en) | 2022-06-09 | 2022-06-09 | Device and method for detection and monitoring of circuit breaker |
Country Status (1)
| Country | Link |
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| WO (1) | WO2023236134A1 (en) |
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| CN201130015Y (en) * | 2007-12-26 | 2008-10-08 | 上海西屋开关有限公司 | Vacuum circuit breaker contact wearing capacity detecting device |
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| CN105374622A (en) * | 2015-12-23 | 2016-03-02 | 戴顿（重庆）高压开关有限公司 | Insulating pull rod, vacuum circuit breaker with insulating pull rod and method for monitoring wearing capacity of movable and static contacts of vacuum circuit breaker |
| US20200075269A1 (en) * | 2017-04-11 | 2020-03-05 | Microelettrica Scientifica S.P.A. | High speed circuit breaker for industrial and railways applications |
| CN111863517A (en) * | 2020-07-31 | 2020-10-30 | 陕西星澜轨道装备有限公司 | Novel direct-current high-speed circuit breaker |
-
2022
- 2022-06-09 WO PCT/CN2022/097800 patent/WO2023236134A1/en unknown
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201130015Y (en) * | 2007-12-26 | 2008-10-08 | 上海西屋开关有限公司 | Vacuum circuit breaker contact wearing capacity detecting device |
| CN101469971A (en) * | 2007-12-26 | 2009-07-01 | 上海西屋开关有限公司 | Method and apparatus for detecting contact head abrasive loss of vacuum circuit breaker |
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| US20200075269A1 (en) * | 2017-04-11 | 2020-03-05 | Microelettrica Scientifica S.P.A. | High speed circuit breaker for industrial and railways applications |
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