GB482444A - Improvements in or relating to electric switchgear - Google Patents
Improvements in or relating to electric switchgearInfo
- Publication number
- GB482444A GB482444A GB2641836A GB2641836A GB482444A GB 482444 A GB482444 A GB 482444A GB 2641836 A GB2641836 A GB 2641836A GB 2641836 A GB2641836 A GB 2641836A GB 482444 A GB482444 A GB 482444A
- Authority
- GB
- United Kingdom
- Prior art keywords
- metal
- insulation
- earthed
- insulators
- bar
- 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
Links
Classifications
-
- 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
- H01H33/24—Means for preventing discharge to non-current-carrying parts, e.g. using corona ring
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H25/00—Steering; Slowing-down otherwise than by use of propulsive elements; Dynamic anchoring, i.e. positioning vessels by means of main or auxiliary propulsive elements
- B63H25/06—Steering by rudders
- B63H25/08—Steering gear
- B63H25/14—Steering gear power assisted; power driven, i.e. using steering engine
- B63H25/26—Steering engines
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H25/00—Steering; Slowing-down otherwise than by use of propulsive elements; Dynamic anchoring, i.e. positioning vessels by means of main or auxiliary propulsive elements
- B63H25/06—Steering by rudders
- B63H25/08—Steering gear
- B63H25/14—Steering gear power assisted; power driven, i.e. using steering engine
- B63H25/26—Steering engines
- B63H25/28—Steering engines of fluid type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/01—Locking-valves or other detent i.e. load-holding devices
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Ocean & Marine Engineering (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Testing Relating To Insulation (AREA)
Abstract
482,444. Switchgear structures. REYROLLE & CO., Ltd., A., and HARLE, J. A. Sept. 29, 1936, No. 26418. [Class 38 (v)] [Also in Group XXXVI] In switchgear of the kind having currentcarrying members surrounded with insulation supported by metal casings or other metal parts which are normally earthed, in order that the insulation may be subjected to routine watts-loss tests to determine if deterioration thereof is occurring, each metal casing or other normally-earthed part is provided with an independent, detachable earth-connection and is insulated from adjacent earthed metal parts, whereby it can be isolated to permit testing of the associated insulation. Open-type gear having insulating bushings supported by earthed rings or flanges can be tested in this way, as well as metal-clad gear. Figs. 1, 2 show a metal-clad, compound-filled, three-phase, horizontal draw-out structure having duplicate bus-bars arranged in separate chambers D, D<1> which communicate through metal trunks D<2> with the chambers of adjacent panels. A transformer chamber E contains current transformers E<2> on bushing insulators E<3> surrounding conductors E<1> which lead from fixed sockets F<5> in orifice insulators, through further bushing insulators G<2> into a cable-dividing box G. A further set of orifice insulators E<4> is provided for a withdrawable potential transformer H, and orifice insulators F with socket contacts F3 are associated with each bus-bar-set. The movable gear comprises an oil-immersed breaker A having fixed plug contacts B<4> and removable selector plug contacts B<5>. Chambers D, D', E are mutually insulated by being supported on insulating feet D', E<6>, and separately connected by readily-detachable leads to a common earth-bar J, Fig. 4. The band joints D<5> between the trunks D<2> and chambers D, D<1> are each provided with an insulating ring D<6>, and an insulating layer G<3> isolates the cablesheath from the box G. Each bushing and orifice insulator in the fixed part of the gear, (Fig. 7) has an embedded metal layer K which, instead of being connected to the earthed metal casing K<1>, is connected to the common earth-bar J by a lead J<1> passing through insulation K<2>. In the insulators of the movable part, however, the leads are detachably connected to the metal casing, Fig. 8 (not shown). In both cases an insulating screen K<3> separates the insulator itself from the adjacent metal casing. Similar metal screens may be provided in or on any insulation which is to be tested separately. Fig. 10 shows how the Schering capacity-bridge is applied to the testing of bus-bar-chamber insulation. The two ends of the testing-arm of the bridge are connected respectively to the normally-live conductors within the insulation to be tested and to the earthing-lead J<1> which has been detached from the common earth-bar J. The other arms comprise the standard condenser L<2> and resistances L<3>, L<4> with variable shunting-condenser. The supply transformer is shown at L and a vibration galvanometer at L<1>. In order to ensure that the capacity between adjacent casings due to the introduced insulation does not affect the measurement, the adjacent casings are brought to the potential of the tested one by means of a capacity M and resistance M<1> adjusted so that the potential of the junction-point equals that of the equipotential points of the bridge. Alternatively, one side of the secondary of L may be earthed and the junction-point connected to the casing under test, Fig. 11 (not shown), or the junction-point may be connected to metal screens in the insulation between two adjacent casings, Figs. 12, 13 (not shown). A method of making the test is described in the Specification.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL84323D NL84323C (en) | 1936-09-29 | ||
GB2641836A GB482444A (en) | 1936-09-29 | 1936-09-29 | Improvements in or relating to electric switchgear |
FR827153D FR827153A (en) | 1936-09-29 | 1937-09-27 | Improvements to switchboard switch installations |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2641836A GB482444A (en) | 1936-09-29 | 1936-09-29 | Improvements in or relating to electric switchgear |
Publications (1)
Publication Number | Publication Date |
---|---|
GB482444A true GB482444A (en) | 1938-03-29 |
Family
ID=10243341
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2641836A Expired GB482444A (en) | 1936-09-29 | 1936-09-29 | Improvements in or relating to electric switchgear |
Country Status (3)
Country | Link |
---|---|
FR (1) | FR827153A (en) |
GB (1) | GB482444A (en) |
NL (1) | NL84323C (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE669408A (en) * | 1964-09-26 | 1900-01-01 | ||
US4114516A (en) * | 1976-10-15 | 1978-09-19 | Caterpillar Tractor Co. | Anti-cavitation and pressure modulating relief valve for controlling hydraulic cylinders |
-
0
- NL NL84323D patent/NL84323C/xx active
-
1936
- 1936-09-29 GB GB2641836A patent/GB482444A/en not_active Expired
-
1937
- 1937-09-27 FR FR827153D patent/FR827153A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
FR827153A (en) | 1938-04-20 |
NL84323C (en) |
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