Patent US3778574A successfully refreshed from Google Patents.
US3778574A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ground-test switch
Assignee: Allis Chalmers Corp
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Filing: 1972-06-26
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Granted: 1973-12-11
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Expires: 1992-06-26
Abstract
Abstract A ground and test switch for metal enclosed gas insulated switchgear which allows testing of the internal conditions of the enclosed switchgear without draining the insulating gas therefrom. Operation of the circuit breaker contacts, contact resistance measurement, high voltage insulation testing, and other electrical and/or mechanical tests requiring connection to the high voltage conductor may be made.
Inventors
- 👤 T Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:58
CPC Classifications
H; H02; H02B; H02B13/00; H02B13/02; H02B13/035; H02B13/075
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
76 words
A ground-test switch for high voltage equipment comprising; a metallic casing in which an insulating gas is confined; at least one high voltage conductor entering into said casing; an external ground connection entering into said casing; means operable to insulate said external ground connection relative to said casing; and, contact means supported within said casing for movement into and out of conductive engagement with said high voltage conductors within said casing and said external ground connection.
Claim 2
Dependent Claim
76 words
A ground-test switch for high voltage equipment comprising; a metallic casing in which an insulating gas is confined; at least one high voltage conductor entering into said casing; an external ground connection entering into said casing; means operable to insulate said external ground connection relative to said casing; and, contact means supported within said casing for movement into and out of conductive engagement with said high voltage conductors within said casing and said external ground connection.
Claim 3
Dependent Claim
65 words
A ground-test switch according to claim 1 wherein there is provided a removable ground connection in series with said external ground connection, whereby the removable ground connection may be taken out of the circuit of said external ground connection and test equipment connected to said external ground connection for testing the internal characteristics of the high voltage equipment with which said ground-test switch is associated.
Claim 4
Dependent Claim
38 words
A ground-test switch according to claim 1 wherein there is provided actuating means operably connected within said switch to actuate said contact means into and out of engagement with said high voltage conductors and said external ground connection.
Claim 5
Dependent Claim
33 words
A ground-test switch according to claim 3 wherein said actuating means are constructed and arranged with means extending outwardly of said casing to afford operation of said actuating means externally of said casing.
Claim 6
Dependent Claim
35 words
A ground-test switch according to claim 4 wherein said contact means when moved out of engagement with said external ground connection maintains engagement with said high voltage conductors to establish electrical continuity between said coNductors.
Claim 7
Dependent Claim
37 words
A ground-test switch according to claim 4 wherein said contact means is a contact rod constructed and arranged to be moved axially into and out of engagement with said high voltage conductors and said internal ground connection.
Claim 8
Dependent Claim
65 words
A ground-test switch according to claim 5 wherein said contact means include a metallic conductive portion and an insulator portion, and said actuating means is connected to the insulator portion thereof, and wherein said conductive portion of said contact means remains in engagement with said high voltage conductors with said insulator portions of said contact means being moved into engagement with said external ground connections.
Claim 9
Dependent Claim
48 words
A ground-test switch according to claim 4 wherein there is provided a conductive bracket supported within said casing in insulated relationship thereto, and said high voltage conductors are connected to said bracket, and said contact means is operable to engage with said bracket and said external ground connection.
Claim 10
Dependent Claim
54 words
A ground-test switch according to claim 4 wherein there is provided a contact actuator housing mounting on said switch casings; insulating means interposed between housing and said casing to electrically insulate one from the other in gas-tight relationship; and said external ground connection extends into said casing through said insulating means in gas-tight relationship.
Claim 11
Dependent Claim
46 words
A ground-test switch according to claim 9 wherein said external ground connection is provided with contact engaging means supported by said insulating means within said casing in position to be engaged by said movable contact means as said movable contact means engages the high voltage conductors.
Claim 12
Dependent Claim
40 words
A ground-test switch according to claim 10 wherein guide means are provided within said switch for maintaining said movable contact means in a guided path as it is moved to engage said high voltage conductors as for external ground connection.
Claim 13
Dependent Claim
36 words
A ground-test switch according to claim 11 wherein said movable contact means is supported for axial movement into operative engagement with said high voltage conductors and said contact engaging means associated with said external ground connection.
Claim 14
Dependent Claim
84 words
A ground-test switch according to claim 12 wherein said contact means of said external ground connection within said switch includes a ring member having an axial opening, said ring member being supported within said switch from said insulator portion to maintain electrical isolation from said switch; and said contact means of said external ground connection is carried by said ring member in co-axial relationship in position to be engaged by said contact means as it is moved into engagement with said high voltage conductors.
Claim 15
Dependent Claim
37 words
A ground-test switch according to claim 13 wherein the opening of said switch casing through which said high voltage conductors enter said switch are provided with insulators to support said high voltage conductors relative to said casing.
References Cited (Backward Citations)
US3348001A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |