US3869587A - Grounding and testing device for electrical switchgear - Google Patents

Grounding and testing device for electrical switchgear Download PDF

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Publication number
US3869587A
US3869587A US445606A US44560674A US3869587A US 3869587 A US3869587 A US 3869587A US 445606 A US445606 A US 445606A US 44560674 A US44560674 A US 44560674A US 3869587 A US3869587 A US 3869587A
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US
United States
Prior art keywords
carrier
primary supply
plugs
contacts
movable 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.)
Expired - Lifetime
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US445606A
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English (en)
Inventor
George Caton
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yorkshire Switchgear and Engineering Co Ltd
Original Assignee
Yorkshire Switchgear and Engineering Co Ltd
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Filing date
Publication date
Application filed by Yorkshire Switchgear and Engineering Co Ltd filed Critical Yorkshire Switchgear and Engineering Co Ltd
Application granted granted Critical
Publication of US3869587A publication Critical patent/US3869587A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B11/00—Switchgear having carriage withdrawable for isolation
    • H02B11/12—Switchgear having carriage withdrawable for isolation with isolation by horizontal withdrawal
    • H02B11/127—Withdrawal mechanism
    • H02B11/133—Withdrawal mechanism with interlock

Definitions

  • ABSTRACT A grounding and testing device for use in electrical switchgear having a stationary housing with two sets of primary supply sockets for feeder and busbar circuits respectively and a movable housing with two sets of primary supply plugs for connection to the sockets and connected to the contacts of switching apparatus in the movable housing, the device comprising a carrier, a set of primary supply extension plugs mounted on the carrier for engaging at one end thereof a set of the primary supply sockets and at the other end thereof a first set of the primary supply plugs a set of primary supply contacts for engaging a second set of the primary supply plugs, ground contacts connected to the primary supply contacts, a first locking mechanism for locking the carrier in position on the movable housing, and
  • the feeder circuit and busbar circuit are contained in a stationary housing, and switching means for connecting these two circuits, usually in conjunction with a circuit breaker, are contained in a movable housing.
  • the stationary housing has two sets of primary supply sockets for the feeder and busbar circuits respectively and the movable housing has two sets of mating primary supply plugs connected to the contacts of the switching means. The primary supply plugs and sockets are connected when the movable housing is moved into an operative position relative to the stationary housing.
  • a grounding and testing device for use in electrical switchgear having a stationary housing with two sets of primary supply sockets for feeder and busbar circuits respectively and a movable housing with two'sets of primary supply plugs for connection to the sockets and connected to the contacts of switching means in the movable housing, the device comprising a carrier, a set of primary supply extension plugs mounted on the carrier for engaging at one end thereof a set of the primary supply sockets and at the other end thereof a first set of the primary supply plugs, a set of primary supply contacts for engaging a second set of the primary supply plugs, ground contacts connected to the primary supply contacts, first locking means for locking the carrier in position on the movable housing, and second locking means for locking the carrier in position on the stationary housing.
  • the device In use, the device is mounted on the movable housing with the primary supply extension plugs and the primary supply contacts engaging respective sets of the primary supply plugs on the movable housing and with the first locking means engaged.
  • the movable housing is then advanced to the stationary housing to engage the primary supply extension plugs with the set of primary supply sockets to be grounded or tested.
  • grounding can be effected by closing the switching means in the movable housing so making a circuit from the primary supply sockets through the pri- 2 mary supply extension plugs, first set of primary supply plugs, switching means, second set of primary supply plugs, and primary supply contacts to the ground contacts.
  • the switching means is opened, the second locking means is engaged, the first locking means is disengaged and the movable housing is withdrawn.
  • the device is thus left mounted and locked on the stationary housing and the primary supply extension plugs effectively form extensions from the primary supply sockets.
  • the extension plugs can then be engaged by test probes and other equipment, so removing the problem of inaccessibility of the primary supply sockets.
  • the locking means are interconnected so that when one is fully engaged the other is fully disengaged.
  • the device may be designed for use in conjunction with any one of a number of different forms of movable and stationary housings.
  • FIG. 1 is a side elevation of the device
  • FIG. 2 is a plan of the device
  • FIGS. 3 to 6 are diagrams showing the modes of use of the device.
  • the device shown is specifically designed for use with three-phase high voltage electrical switchgear as described in our co-pending British application No. 12482/72.
  • This comprises a stationary housing 1 (FIG. 3) housing three feeder circuits (not shown) connected to a first set of three horizontally aligned primary supply sockets such as 2 and three busbar circuits (not shown) connected to a second set of three horizontally aligned primary supply sockets such as 3.
  • a movable housing 4 is mounted on wheels 5 for horizontal movement towards and away from the stationary housing.
  • the movable housing has a first set of three horizontally aligned primary supply plugs such as 6, and a second set of three horizontally aligned primary supply plugs such as 7.
  • the plugs are connected to contacts of switching means within the movable housing so that circuits may be made between vertically aligned plugs of each set.
  • the movable housing In normal operation of the switchgear the movable housing is positioned so that plugs 6, 7 engage sockets 2, 3 respectively.
  • the device comprises an insulating carrier 8 from which projects an insulating plate section 9 carrying three primary supply extension plugs 10 to 12 carrying cluster contacts 13 to 15 respectively at their forward ends and formed with sockets 16 to 18 respectively at their other ends.
  • the section 9 also has shutter operating rods 19 mounted thereon.
  • a further plate 20 is fixed to the carrier and supports three primary supply contacts in the form of star point contacts such as 21. These are connected to ground contacts in the form of conducting strips 22, 23 at each side of the device, each strip having two contacts 24 and 25.
  • a shaft 26 Pivotally mounted between the strips 22, 23 is a shaft 26, at a level between the axes of extension plugs 10 to 12 and the axes of star point contacts 21.
  • Each end of the shaft carries a lever 27 having a hook 28 formed on one arm thereof and a slot 29 formed in the other arm thereof.
  • a handle30 is fixed to one of the levers 27.
  • '3 lnterlockmembers 31 are pivoted to each side of the carrier by pivotpins 32, each member having agroove 33 in which a pin 34 engages. Springs (not shown) bias the members 31 to the positions shown. At the ends opposite to the grooves 33 the levers have a section 35 shaped to lie above the space between the strips 22 and 23.
  • the device for grounding the feeder circuits in the stationary housing, the device is fitted to the movable housing as shown in FIG. 3, the switching means in the movable housing being open.
  • the ground contacts 25 engage contacts (not shown) fitted to the metal sides of the movable housing 4 to make grounding contact therewith.
  • the handle 30 is then moved clockwise as shown in FIG.
  • Grounding of the feeder circuits is then completed by closing the switching means to make a circuit from sockets 2 through extension plugs 10 to 12, primary supply plugs 6, the switching means, primary supply plugs 7, star point contacts'21 and ground contacts 24, 25 to the ground contacts on the housings.
  • the switching means in the movable housing is opened to break the ground circuitand handle 30 is moved counterclockwise to cause Ihooks 28 to engage pins 37 on thestationary housing and to cause the slots 29 to disengage from the-pins 29a on the movable housing.
  • the movable housing can then be withdrawn leaving the device supported on the stationary housing as shown in FIG. 5. With the device in this position it will be seen that the extension plugs 10 to 12 effectively extend the sockets 2 further forward to the positions of sockets 16 to 18, and so improve the accessibility for testing purposes.
  • the interlock members 31 guard against the possibility of manual insertion of the device into the stationary housing, as the-ends 38 of the members 31 engage the side plates of the stationary housing and prevent contact of contacts 13 to with sockets 2 or 3.
  • the sections 35 are engaged by the housing and are moved outwardly, so moving members 31 against their spring bias to cause ends 38 to be drawn inwardly so that fitting to 4 the stationary housingisunimpeded.
  • FIG. 6 shows that the device may also be used invetted so that the-extension plugs to, 12 engage the busbar sockets 3 in the stationary housing and allow these to be groundin a manner analogous to that already described.
  • the device is held on the movable housing by engagement of slots 29 with pins 29a.
  • hooks 28' will not engage pins 37 on the stationary housing, and indeed such engagement is unnecessarysince there .is no need for retention of the grounding device on the stationary housing when the busbar sockets are being engaged.
  • a groundingand testing device for use in electrical switchgear having a stationary housing with two sets of primary supply sockets for feeder and busbar circuits respectively and a movable housing with two sets of primary supply plugs for connection to the sockets and connected to the contacts of switching means in the movable housing, the device comprising a carrier, a set of primary supply extension plugs mounted on the carrier for engaging at one end thereof a set of the primary supply sockets and at the other end thereof a first set of the primary supply plugs, a set of primary supply contacts on said carrier for engaging a second set of the primary supply plugs, ground contacts connected to the primary supply contacts, first locking means for locking theicarrier in position on the movable housing, and second locking means for locking the carrier in position on the stationary housing.
  • the locking means comprise a lever pivotally mounted between its ends on the carrier, a first end of the lever being formed with an arcuate slot for engaging with a pin on the movable housing and constituting the first locking means, and a second end of the lever being formed with a hook for engaging a pin on the stationary housing and constituting the second locking means.
  • a device in which two of said levers are provided, one at each side of the carrier, the leversbeing joined for commonpivotal movement.
  • a device in which interlock members are provided on the carrier for preventing engagement of the device with a stationary housing unless the device is already locked in position on a movable housing.
  • a device in which there are two interlock members, one at each side of the carrier, and each comprises a lever pivoted to the carrier and spring biased to a position wherein a first end of the lever projects beyond the side of the carrier to prevent engagement with the stationary housing, the second end of the lever being shaped to be deflected when mounting the carrier on the movable housing to withdraw the first end of the lever from its projecting position.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Trip Switchboards (AREA)
  • Details Of Connecting Devices For Male And Female Coupling (AREA)
  • Switch Cases, Indication, And Locking (AREA)
  • Patch Boards (AREA)
US445606A 1973-03-06 1974-02-25 Grounding and testing device for electrical switchgear Expired - Lifetime US3869587A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1087073A GB1419318A (en) 1973-03-06 1973-03-06 Electrical switchgear

Publications (1)

Publication Number Publication Date
US3869587A true US3869587A (en) 1975-03-04

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ID=9975836

Family Applications (1)

Application Number Title Priority Date Filing Date
US445606A Expired - Lifetime US3869587A (en) 1973-03-06 1974-02-25 Grounding and testing device for electrical switchgear

Country Status (14)

Country Link
US (1) US3869587A (enrdf_load_stackoverflow)
JP (1) JPS5024740A (enrdf_load_stackoverflow)
BE (1) BE811772A (enrdf_load_stackoverflow)
CA (1) CA993951A (enrdf_load_stackoverflow)
CH (1) CH586469A5 (enrdf_load_stackoverflow)
DE (1) DE2410353A1 (enrdf_load_stackoverflow)
DK (1) DK137255B (enrdf_load_stackoverflow)
FR (1) FR2220900B1 (enrdf_load_stackoverflow)
GB (1) GB1419318A (enrdf_load_stackoverflow)
IN (1) IN138872B (enrdf_load_stackoverflow)
IT (1) IT1009212B (enrdf_load_stackoverflow)
NL (1) NL7402941A (enrdf_load_stackoverflow)
SE (1) SE385170B (enrdf_load_stackoverflow)
ZA (1) ZA741227B (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110808549A (zh) * 2019-12-09 2020-02-18 国网辽宁省电力有限公司鞍山供电公司 一种可调式中置柜接地装置及其使用方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS567406Y2 (enrdf_load_stackoverflow) * 1975-12-11 1981-02-18

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2600304A (en) * 1950-06-10 1952-06-10 Gen Electric Substitute unit for circuit testing and grounding

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2600304A (en) * 1950-06-10 1952-06-10 Gen Electric Substitute unit for circuit testing and grounding

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110808549A (zh) * 2019-12-09 2020-02-18 国网辽宁省电力有限公司鞍山供电公司 一种可调式中置柜接地装置及其使用方法
CN110808549B (zh) * 2019-12-09 2023-08-15 国网辽宁省电力有限公司鞍山供电公司 一种可调式中置柜接地装置及其使用方法

Also Published As

Publication number Publication date
FR2220900A1 (enrdf_load_stackoverflow) 1974-10-04
DE2410353A1 (de) 1974-09-12
JPS5024740A (enrdf_load_stackoverflow) 1975-03-17
ZA741227B (en) 1975-01-29
SE385170B (sv) 1976-06-08
IN138872B (enrdf_load_stackoverflow) 1976-04-10
DK137255B (da) 1978-02-06
CH586469A5 (enrdf_load_stackoverflow) 1977-03-31
DK137255C (enrdf_load_stackoverflow) 1978-07-10
FR2220900B1 (enrdf_load_stackoverflow) 1980-03-07
IT1009212B (it) 1976-12-10
GB1419318A (en) 1975-12-31
BE811772A (fr) 1974-07-01
NL7402941A (enrdf_load_stackoverflow) 1974-09-10
AU6625574A (en) 1975-09-04
CA993951A (en) 1976-07-27

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