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US4880395A Expired / Lapsed US ⏱️ 0.0 years remaining

Contact on test switch

Assignee: ABB AB
•
Filing: 1988-12-09
•
Granted: 1989-11-14
•
Expires: 2008-12-09
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Abstract

Abstract The present invention relates to a test system for a protective relay. The test system comprises a test switch (1) and a test-plug handle (2). The invention comprises supplementing the system with a contact function which is activated when the handle is inserted into the test switch so that, before the testing of the relays in the protective device is initiated, a signal function can be obtained to indicate that testing is in progress. The contact function is brought about by arranging, on the upper and/or lower side(s) of the test switch, two semi-protected, uninsulated and parallel contact pins/slide bars (4, 5) from the front edge to the rear edge of the test switch. At the rear edge contact parts to ordinary conductors are arranged in order to forward the contact function. The contact pins are mounted in a guide structure (10, 11) formed with an inner guide profile adapted to guide two resilient tongues (13, 14) on the test-plug handle. On the sides of the tongues facing the test switch, these tongues are each provided with a contact washer. The parts included cooperate in such a way that, once the test-plug handle has been inserted into the test switch, contact is achieved between the two contact pins on the upper and/or lower side(s) of the test switch.

Inventors

  • 👤 Rolf Eriksson
  • 👤 Gudmar Hammarlund
  • 👤 Lars-Erik Sundqvist

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-22 23:25
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/327; G01R31/3277; G01R31/3278; H; H01; H01R; H01R29/00; Y; Y10; Y10S; Y10S439/00; Y10S439/912

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 190 words
A device for achieving a contact function in a protective relay test system, said system comprising a test switch with compartments for different contact units and a test-plug handle with contact pins for activating the function of the contact units and adapted for insertion into the test switch, wherein each of the upper and/or lower side of the test switch is provided with two uninsulated, parallel contact pins/slide bars extending from the front edge of the test switch to its rear edge and each being provided at its rear edge with connection parts for transition to a common conductor, the contact pins/slide bars and the connection parts being mounted in a guide structure having an inner guide profile adapted for guiding resilient tongues arranged on the test-plug handle, each of said tongues, on that side facing the contact pins, being provided with a contact washer, and wherein contact pins, guides, tongues and contact washers cooperate in such a way that, once the test-plug handle has been inserted into the test switch, contact is made between the two contact pins/slide bars on the upper and/or lower side(s) of the test switch.
Claim 2
Independent Claim 190 words
A device for achieving a contact function in a protective relay test system, said system comprising a test switch with compartments for different contact units and a test-plug handle with contact pins for activating the function of the contact units and adapted for insertion into the test switch, wherein each of the upper and/or lower side of the test switch is provided with two uninsulated, parallel contact pins/slide bars extending from the front edge of the test switch to its rear edge and each being provided at its rear edge with connection parts for transition to a common conductor, the contact pins/slide bars and the connection parts being mounted in a guide structure having an inner guide profile adapted for guiding resilient tongues arranged on the test-plug handle, each of said tongues, on that side facing the contact pins, being provided with a contact washer, and wherein contact pins, guides, tongues and contact washers cooperate in such a way that, once the test-plug handle has been inserted into the test switch, contact is made between the two contact pins/slide bars on the upper and/or lower side(s) of the test switch.
Claim 3
Dependent Claim 42 words
A device for achieving a contact function in a protective relay test system according to claim 1, wherein guides with contact pins/slide bars and connection parts are mounted on a plate arranged on the upper and/or lower side(s) of the test switch.
Claim 4
Dependent Claim 42 words
A device for achieving a contact function in a protective relay test system according to claim 1, wherein guides with contact pins/slide bars and connection parts are mounted as an integral part of the upper and/or lower side(s) of the test switch.
Claim 5
Dependent Claim 33 words
A device for achieving a contact function in a protective relay test system according to claim 1, wherein the two tongues of the test-plug handle are arranged as integral parts of the handle.
Claim 6
Dependent Claim 31 words
A device for achieving a contact function in a protective relay test system according to claim 1, wherein the two tongues are arranged as separate tongues attached to the test-plug handle.

References Cited (Backward Citations)

US2664544A Cited
US3696296A Cited
US3997234A Cited
DE3121964A1 Cited
US4582383A Cited
US4795355A Cited
US4735574A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1992-11-13 1993-05-15 1993-11-14 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1996-11-13 1997-05-15 1997-11-14 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2000-11-13 2001-05-15 2001-11-14 $7700.00 Window Closed / Lapsed

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