US3512043A - Means for short-circuiting the secondary circuit of a current transformer - Google Patents
Means for short-circuiting the secondary circuit of a current transformer Download PDFInfo
- Publication number
- US3512043A US3512043A US681644A US3512043DA US3512043A US 3512043 A US3512043 A US 3512043A US 681644 A US681644 A US 681644A US 3512043D A US3512043D A US 3512043DA US 3512043 A US3512043 A US 3512043A
- Authority
- US
- United States
- Prior art keywords
- short
- circuiting
- current transformer
- secondary circuit
- contact
- 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.)
- Expired - Lifetime
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/20—Instruments transformers
- H01F38/22—Instruments transformers for single phase ac
- H01F38/28—Current transformers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/20—Instruments transformers
- H01F38/22—Instruments transformers for single phase ac
- H01F38/28—Current transformers
- H01F38/30—Constructions
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/66—Structural association with built-in electrical component
- H01R13/70—Structural association with built-in electrical component with built-in switch
- H01R13/703—Structural association with built-in electrical component with built-in switch operated by engagement or disengagement of coupling parts, e.g. dual-continuity coupling part
- H01R13/7031—Shorting, shunting or bussing of different terminals interrupted or effected on engagement of coupling part, e.g. for ESD protection, line continuity
- H01R13/7032—Shorting, shunting or bussing of different terminals interrupted or effected on engagement of coupling part, e.g. for ESD protection, line continuity making use of a separate bridging element directly cooperating with the terminals
Definitions
- a device for short-circuiting the secondary circuit of a transformer when a contact making device is removed from such circuit comprises a body of insulating material in which is slidably mounted a short-circuiting member which is pushed into a position by a spring to make contact with two jacks when the contact making device is removed, so as to short-circuit the transformer.
- a pin engaging a pin on the short-circuiting member pushes it to another position in which it no longer short-circuits the secondary.
- the invention relates to an arrangement for shortcircuiting a secondary circuit of a current transformer when a relay or other device is removed from such clrcuit.
- the device consists of a socket of insulating material and a short-circuiting body which is movably arranged in an aperture in the socket.
- the body is actuated partly by a spring mounted in the aperture and partly by a pin on the apparatus.
- the contact arrangement in the device consists of two contact parts which are connected to the secondary circuit of the current transformer.
- the device is inserted in a mounting plate 1.
- the device consists of a socket 2, in which there is an aperture 3, in which a short-circuiting body 4, is arranged.
- the body at its centre part 5, is actuated by a pressure spring 6, which is in contact with a bottom surface 7 in the aperture and presses the body to the left in the figure.
- the free ends of the body are bent in order to obtain a good contact surface, partly against two contact parts 9, partly against a slanting surface 10 in the aperture.
- the contact parts 9 are shaped as contact jacks inserted in tubes 11 in the socket. At their right end the jacks are connected to a cable from the secondary circuit of a current transformer which is not shown.
- the relay which is to be connected, only the bottom socket 20, two plugs 21 and a pin 22 are shown in the figure.
- the pin 22 is intended to cooperate with a guide pin 14 in the body 4 and to press the body to the right when the relay is inserted in its place. When moved to the right, the body is compressed slightly and its free ends are slid along the edges 15 in the aperture so that the short-circuit is broken.
- the lengths of the guide pin 14, pin 22 and the two plugs 21 on the relay are so dimensioned that upon insertion of the relay into the socket the plugs 21 have good contact with the contact jacks 9 before the body 4 is pressed so far to the right that the short-circuiting between the contact parts 9 is broken. Upon the removing of the relay the body 4 will have brought about a short-circuit of the secondary circuit before the plugs 21 have left the contact jacks 9.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transformers For Measuring Instruments (AREA)
Description
May 12, 1970 L. JAAKSOO ETAL 3,512,043
MEANS FOR SHORT-CIRCUITING THE SECONDARY CIRCUIT OF A CURRENT TRANSFORMER Filed Nov. 9, 1967 INVENTOR.
A (m l ro H 1 N550 N warm bx 5 A (HE United States Patent U.S. Cl. 31714 2 Claims ABSTRACT OF THE DISCLOSURE A device for short-circuiting the secondary circuit of a transformer when a contact making device is removed from such circuit comprises a body of insulating material in which is slidably mounted a short-circuiting member which is pushed into a position by a spring to make contact with two jacks when the contact making device is removed, so as to short-circuit the transformer. When the contact making device is replaced, a pin engaging a pin on the short-circuiting member pushes it to another position in which it no longer short-circuits the secondary.
BACKGROUND OF THE INVENTION Field of the invention The invention relates to an arrangement for shortcircuiting a secondary circuit of a current transformer when a relay or other device is removed from such clrcuit.
The prior art When disconnecting electrical apparatus which are directly connected to a current transformer there is a great risk that the secondary circuit of the current transformer will be opened involuntarily. This is the case especially with apparatus of the plug-in type, for example, relays. Usually some type of switch-over with non-interrupting contacts is used for short-circuiting the secondary circuit before the apparatus is removed from its mounting plate. As the switchover is operated manually, there is always a risk that the short-circuit is not brought about, which results in an opening of the secondary circuit and risks of damage to the current transformer.
Summary of the invention With a device according to the invention an automatic short-circuiting of the secondary circuit is obtained when the apparatus is removed. The short-circuiting is brought about before the apparatus is removed and the risk of damaging the current transformer is completely eliminated.
The essential characteristic for the invention is that the device consists of a socket of insulating material and a short-circuiting body which is movably arranged in an aperture in the socket. The body is actuated partly by a spring mounted in the aperture and partly by a pin on the apparatus. The contact arrangement in the device consists of two contact parts which are connected to the secondary circuit of the current transformer. When the apparatus is removed the body is situated in one of its end positions under influence of the spring where it brings about a shortcircuit between the two mentioned contact parts. When the apparatus is inserted the body is situated at its second end position under the influence of the pin in the apparatus whereupon the short-circuit is nullified.
Brief description of the drawing The attached drawing shows the structure of the invention when applied to a relay of the plug-in type.
Description of the preferred embodiments In the modification shown in the drawing, the device is inserted in a mounting plate 1. The device consists of a socket 2, in which there is an aperture 3, in which a short-circuiting body 4, is arranged. The body at its centre part 5, is actuated by a pressure spring 6, which is in contact with a bottom surface 7 in the aperture and presses the body to the left in the figure. The free ends of the body are bent in order to obtain a good contact surface, partly against two contact parts 9, partly against a slanting surface 10 in the aperture. The contact parts 9 are shaped as contact jacks inserted in tubes 11 in the socket. At their right end the jacks are connected to a cable from the secondary circuit of a current transformer which is not shown.
Of the relay which is to be connected, only the bottom socket 20, two plugs 21 and a pin 22 are shown in the figure. When the relay is mounted on the mounting plate the plugs 21 enter the jacks 9, and by this the relay is connected to the secondary circuit of the current transformer. The pin 22 is intended to cooperate with a guide pin 14 in the body 4 and to press the body to the right when the relay is inserted in its place. When moved to the right, the body is compressed slightly and its free ends are slid along the edges 15 in the aperture so that the short-circuit is broken. The lengths of the guide pin 14, pin 22 and the two plugs 21 on the relay are so dimensioned that upon insertion of the relay into the socket the plugs 21 have good contact with the contact jacks 9 before the body 4 is pressed so far to the right that the short-circuiting between the contact parts 9 is broken. Upon the removing of the relay the body 4 will have brought about a short-circuit of the secondary circuit before the plugs 21 have left the contact jacks 9.
We claim:
1. Device for short-circuiting the secondary circuit of a current transformer simultaneously with the removing of an apparatus which is connected to said current transformer by means of said device, said device comprising a socket of insulating material having an aperture therein, a short-circuiting means movably arranged in said aperture, a pressure spring in said aperture and a pin on said apparatus for moving said short-circuiting means in opposite directions, said socket having tubes therein on opposite sides of said aperture and communicating therewith, two contact jacks in said socket connected to the secondary circuit of said current transformer, each said contact jacks being positioned in one of said tubes, said short-circuiting 4 means engaging in direct contact with said contact jacks References Cited when the apparatus is removedfrom the soclret, said con- UNITED STATES PATENTS tact acks being arranged for direct cooperation with corresponding contact pins on the apparatus. g 1;9 2: 3%? 2. A device acco din to claim 1, said short-circuitin I I g g 5 3,243,773 3/1966 Leichsenring zoo-41.10 X
body being provided with a guide pin which cooperates with said pin of said apparatus, the length of the guide pin and said pin in the apparatus being such that the apparatus JAMES TRAMMELL Pnmary Exammer is electrically connected to the current transformer before U S cl X R the short-circuit is broken upon inserting of an apparatus 10 in the socket. ZOO-51.10; 336-107
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US68164467A | 1967-11-09 | 1967-11-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3512043A true US3512043A (en) | 1970-05-12 |
Family
ID=24736151
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US681644A Expired - Lifetime US3512043A (en) | 1967-11-09 | 1967-11-09 | Means for short-circuiting the secondary circuit of a current transformer |
Country Status (1)
Country | Link |
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US (1) | US3512043A (en) |
Cited By (37)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3692966A (en) * | 1970-07-22 | 1972-09-19 | Cooke Eng Co The | Multi-circuit patch plug and jack |
US3903385A (en) * | 1973-10-25 | 1975-09-02 | E Advanced Packaging Inc Sa | Shorting bar switch in electrical connector biasing assembly |
US4053724A (en) * | 1974-06-21 | 1977-10-11 | Jesus Gomez Llona | Panel and plural module assembly having mechanical keying and modular plug structure to activate/deactivate automatically bridged load carrying circuits |
FR2360046A2 (en) * | 1976-07-27 | 1978-02-24 | Daimler Benz Ag | IGNITION DEVICE FOR A PASSIVE RESTRAINT SYSTEM |
US4151576A (en) * | 1977-10-31 | 1979-04-24 | General Electric Company | Transformer secondary disconnect and shorting switch |
FR2431112A1 (en) * | 1978-07-12 | 1980-02-08 | Daimler Benz Ag | SAFETY DEVICE BY SHORT-CIRCUIT OF CONTACTS, FOR ELECTRIC IGNITERS |
US4256936A (en) * | 1976-01-19 | 1981-03-17 | Dynatech Laboratories, Inc. | Electrical jack and patch cord assemblies |
US4594490A (en) * | 1984-11-08 | 1986-06-10 | At&T Bell Laboratories | Terminal pin shorting switch apparatus |
WO1986003894A1 (en) * | 1984-12-20 | 1986-07-03 | Amp Incorporated | A closed loop connector |
EP0318644A2 (en) * | 1987-12-03 | 1989-06-07 | Evaristo Garcia Ramos | A computer connector with an automatic loop closure device |
US4904196A (en) * | 1987-07-17 | 1990-02-27 | Yazaki Corporation | Releasable connector for electric circuits |
EP0389779A2 (en) * | 1989-03-25 | 1990-10-03 | Robert Bosch Gmbh | Multiple plug-and-socket device |
US4988307A (en) * | 1989-10-10 | 1991-01-29 | Itt Corporation | Circuit shorting connector |
FR2655476A2 (en) * | 1988-06-17 | 1991-06-07 | Avocat Jean Paul | Electrical measurement transformer |
EP0492018A1 (en) * | 1989-12-05 | 1992-07-01 | Jean Paul Avocat | Electric measuring transformer |
US5145391A (en) * | 1991-04-29 | 1992-09-08 | Gte Products Corporation | Switching connector assembly |
US5201853A (en) * | 1991-04-29 | 1993-04-13 | Gte Products Corporation | Switching connector assembly |
US5275575A (en) * | 1992-10-09 | 1994-01-04 | Trw Inc. | Electrical connection system with safety interlock |
US5277602A (en) * | 1992-11-25 | 1994-01-11 | Yi Lee M | Electrical plug and receptacle assembly |
US5314345A (en) * | 1992-10-09 | 1994-05-24 | Trw Inc. | Electrical connection system with interlock |
US5505631A (en) * | 1993-07-16 | 1996-04-09 | Kabelmetal Electro Gmbh | Device to connect an explosive charge with an electric current source |
ES2083902A2 (en) * | 1992-05-08 | 1996-04-16 | Hughes Aircraft Comapany | Electrostatic discharge safety connector for electro-explosive devices |
US5600108A (en) * | 1994-08-29 | 1997-02-04 | Bed-Check Corporation | Docking module enclosure including connectors and power switching |
US6198233B1 (en) | 1998-11-13 | 2001-03-06 | Zeon Corporation | Neon sign transformer module and receptacle |
FR2898728A1 (en) * | 2006-03-17 | 2007-09-21 | Manuf D App Electr De Cahors S | Electric current measurement transformer for use in three phase system, has two switches normally opening connections with intermediate terminals, and two switches normally closing electric and end connections with end connection terminal |
DE19702373B4 (en) * | 1997-01-23 | 2008-02-21 | The Whitaker Corp., Wilmington | Electrical connector with a short-circuit spring and short-circuit spring |
US7354287B1 (en) * | 2006-10-31 | 2008-04-08 | Caterpillar Inc. | Shorting connector |
US20080142344A1 (en) * | 2006-12-18 | 2008-06-19 | Caterpillar Inc. | Electrical shorting system |
US20090141412A1 (en) * | 2006-12-18 | 2009-06-04 | Caterpillar Inc. | Electrical interface system |
US20090186504A1 (en) * | 2006-04-24 | 2009-07-23 | Eduardo Pedrosa Santos | Electrical Circuit Quick Connection And Disconnection System With Automatic Short Circuit Of Current Transformer Secondaries |
US20090296397A1 (en) * | 2008-06-03 | 2009-12-03 | Gibboney Jr James W | Push rod shunt for light string sockets |
CN104319523A (en) * | 2014-05-22 | 2015-01-28 | 中航光电科技股份有限公司 | Electric connector with function of short-circuit protection |
US20160064841A1 (en) * | 2013-04-26 | 2016-03-03 | Pepperl + Fuchs Gmbh | Receiving socket for receiving and making contact with an electronic module |
CN105610016A (en) * | 2016-02-29 | 2016-05-25 | 蒋尚葵 | Charging clutch |
US20160301205A1 (en) * | 2015-04-13 | 2016-10-13 | Lsis Co., Ltd. | Circuit breaker having safety switching part |
US20180090896A1 (en) * | 2015-04-23 | 2018-03-29 | Autonetworks Technologies, Ltd. | Joint connector |
US10777945B2 (en) | 2019-02-05 | 2020-09-15 | Schweitzer Engineering Laboratories, Inc. | Shorting block for a current transformer |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2747049A (en) * | 1954-02-01 | 1956-05-22 | Anchor Mfg Co | Plug-in meter socket with shunt switch and signal |
US3208021A (en) * | 1962-09-12 | 1965-09-21 | Astra Corp | Shorting switch mechanism |
US3243773A (en) * | 1965-04-29 | 1966-03-29 | Leichsenring Max | Control means for the selective energization of an electrically energizable device from an electrical potential source |
-
1967
- 1967-11-09 US US681644A patent/US3512043A/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2747049A (en) * | 1954-02-01 | 1956-05-22 | Anchor Mfg Co | Plug-in meter socket with shunt switch and signal |
US3208021A (en) * | 1962-09-12 | 1965-09-21 | Astra Corp | Shorting switch mechanism |
US3243773A (en) * | 1965-04-29 | 1966-03-29 | Leichsenring Max | Control means for the selective energization of an electrically energizable device from an electrical potential source |
Cited By (53)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3692966A (en) * | 1970-07-22 | 1972-09-19 | Cooke Eng Co The | Multi-circuit patch plug and jack |
US3903385A (en) * | 1973-10-25 | 1975-09-02 | E Advanced Packaging Inc Sa | Shorting bar switch in electrical connector biasing assembly |
US4053724A (en) * | 1974-06-21 | 1977-10-11 | Jesus Gomez Llona | Panel and plural module assembly having mechanical keying and modular plug structure to activate/deactivate automatically bridged load carrying circuits |
US4256936A (en) * | 1976-01-19 | 1981-03-17 | Dynatech Laboratories, Inc. | Electrical jack and patch cord assemblies |
FR2360046A2 (en) * | 1976-07-27 | 1978-02-24 | Daimler Benz Ag | IGNITION DEVICE FOR A PASSIVE RESTRAINT SYSTEM |
US4151576A (en) * | 1977-10-31 | 1979-04-24 | General Electric Company | Transformer secondary disconnect and shorting switch |
FR2431112A1 (en) * | 1978-07-12 | 1980-02-08 | Daimler Benz Ag | SAFETY DEVICE BY SHORT-CIRCUIT OF CONTACTS, FOR ELECTRIC IGNITERS |
US4594490A (en) * | 1984-11-08 | 1986-06-10 | At&T Bell Laboratories | Terminal pin shorting switch apparatus |
WO1986003894A1 (en) * | 1984-12-20 | 1986-07-03 | Amp Incorporated | A closed loop connector |
US4904196A (en) * | 1987-07-17 | 1990-02-27 | Yazaki Corporation | Releasable connector for electric circuits |
EP0318644A2 (en) * | 1987-12-03 | 1989-06-07 | Evaristo Garcia Ramos | A computer connector with an automatic loop closure device |
EP0318644A3 (en) * | 1987-12-03 | 1990-05-23 | Evaristo Garcia Ramos | A computer connector with an automatic loop closure device |
FR2655476A2 (en) * | 1988-06-17 | 1991-06-07 | Avocat Jean Paul | Electrical measurement transformer |
EP0389779A2 (en) * | 1989-03-25 | 1990-10-03 | Robert Bosch Gmbh | Multiple plug-and-socket device |
EP0389779A3 (en) * | 1989-03-25 | 1990-12-19 | Robert Bosch Gmbh | Multiple plug-and-socket device |
US4988307A (en) * | 1989-10-10 | 1991-01-29 | Itt Corporation | Circuit shorting connector |
EP0492018A1 (en) * | 1989-12-05 | 1992-07-01 | Jean Paul Avocat | Electric measuring transformer |
US5145391A (en) * | 1991-04-29 | 1992-09-08 | Gte Products Corporation | Switching connector assembly |
US5201853A (en) * | 1991-04-29 | 1993-04-13 | Gte Products Corporation | Switching connector assembly |
ES2083902A2 (en) * | 1992-05-08 | 1996-04-16 | Hughes Aircraft Comapany | Electrostatic discharge safety connector for electro-explosive devices |
US5275575A (en) * | 1992-10-09 | 1994-01-04 | Trw Inc. | Electrical connection system with safety interlock |
US5314345A (en) * | 1992-10-09 | 1994-05-24 | Trw Inc. | Electrical connection system with interlock |
US5277602A (en) * | 1992-11-25 | 1994-01-11 | Yi Lee M | Electrical plug and receptacle assembly |
US5505631A (en) * | 1993-07-16 | 1996-04-09 | Kabelmetal Electro Gmbh | Device to connect an explosive charge with an electric current source |
US5600108A (en) * | 1994-08-29 | 1997-02-04 | Bed-Check Corporation | Docking module enclosure including connectors and power switching |
DE19702373B4 (en) * | 1997-01-23 | 2008-02-21 | The Whitaker Corp., Wilmington | Electrical connector with a short-circuit spring and short-circuit spring |
US6392360B2 (en) | 1998-11-13 | 2002-05-21 | Zeon Corporation | Neon sign transformer module and receptacle |
US6618231B2 (en) | 1998-11-13 | 2003-09-09 | Zeon Corporation | Neon sign transformer module and receptacle |
US20030210503A1 (en) * | 1998-11-13 | 2003-11-13 | Mcconaughy Drew B. | High voltage transformer module and receptacle |
US6788510B2 (en) | 1998-11-13 | 2004-09-07 | Zeon Corporation | High voltage transformer module and receptacle |
US6198233B1 (en) | 1998-11-13 | 2001-03-06 | Zeon Corporation | Neon sign transformer module and receptacle |
FR2898728A1 (en) * | 2006-03-17 | 2007-09-21 | Manuf D App Electr De Cahors S | Electric current measurement transformer for use in three phase system, has two switches normally opening connections with intermediate terminals, and two switches normally closing electric and end connections with end connection terminal |
US20090186504A1 (en) * | 2006-04-24 | 2009-07-23 | Eduardo Pedrosa Santos | Electrical Circuit Quick Connection And Disconnection System With Automatic Short Circuit Of Current Transformer Secondaries |
US7955102B2 (en) * | 2006-04-24 | 2011-06-07 | Eduardo Pedrosa Santos | Locking system to keep movable contacts apart from fixed contacts of a short circuit |
US20080102672A1 (en) * | 2006-10-31 | 2008-05-01 | Caterpillar Inc. | Shorting connector |
US7354287B1 (en) * | 2006-10-31 | 2008-04-08 | Caterpillar Inc. | Shorting connector |
US20080142344A1 (en) * | 2006-12-18 | 2008-06-19 | Caterpillar Inc. | Electrical shorting system |
US20090141412A1 (en) * | 2006-12-18 | 2009-06-04 | Caterpillar Inc. | Electrical interface system |
US7789685B2 (en) | 2006-12-18 | 2010-09-07 | Caterpillar Inc | Electrical shorting system |
US7616421B2 (en) | 2006-12-18 | 2009-11-10 | Caterpillar Inc. | Electrical interface system |
US7633024B1 (en) * | 2008-06-03 | 2009-12-15 | Tech Patent Licensing, Llc | Push rod shunt for light string sockets |
US20090296397A1 (en) * | 2008-06-03 | 2009-12-03 | Gibboney Jr James W | Push rod shunt for light string sockets |
US20160064841A1 (en) * | 2013-04-26 | 2016-03-03 | Pepperl + Fuchs Gmbh | Receiving socket for receiving and making contact with an electronic module |
US9531094B2 (en) * | 2013-04-26 | 2016-12-27 | Pepperl + Fuchs Gmbh | Receiving socket for receiving and making contact with an electronic module |
CN104319523A (en) * | 2014-05-22 | 2015-01-28 | 中航光电科技股份有限公司 | Electric connector with function of short-circuit protection |
CN104319523B (en) * | 2014-05-22 | 2017-01-04 | 中航光电科技股份有限公司 | A kind of electric connector with short circuit defencive function |
US20160301205A1 (en) * | 2015-04-13 | 2016-10-13 | Lsis Co., Ltd. | Circuit breaker having safety switching part |
US10084306B2 (en) * | 2015-04-13 | 2018-09-25 | Lsis Co., Ltd. | Circuit breaker having safety switching part |
US20180090896A1 (en) * | 2015-04-23 | 2018-03-29 | Autonetworks Technologies, Ltd. | Joint connector |
US10622774B2 (en) * | 2015-04-23 | 2020-04-14 | Autonetworks Technologies, Ltd. | Joint connector |
CN105610016A (en) * | 2016-02-29 | 2016-05-25 | 蒋尚葵 | Charging clutch |
CN105610016B (en) * | 2016-02-29 | 2018-06-19 | 蒋尚葵 | Charge clutch |
US10777945B2 (en) | 2019-02-05 | 2020-09-15 | Schweitzer Engineering Laboratories, Inc. | Shorting block for a current transformer |
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