GB629541A - Improvements in or relating to electromagnetic relay systems for heavy alternating currents - Google Patents
Improvements in or relating to electromagnetic relay systems for heavy alternating currentsInfo
- Publication number
- GB629541A GB629541A GB30308/46A GB3030846A GB629541A GB 629541 A GB629541 A GB 629541A GB 30308/46 A GB30308/46 A GB 30308/46A GB 3030846 A GB3030846 A GB 3030846A GB 629541 A GB629541 A GB 629541A
- Authority
- GB
- United Kingdom
- Prior art keywords
- relay
- moment
- current
- energization
- begins
- 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
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
- H01H9/56—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere for ensuring operation of the switch at a predetermined point in the ac cycle
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H51/00—Electromagnetic relays
- H01H51/30—Electromagnetic relays specially adapted for actuation by ac
-
- 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
- H01H33/006—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means adapted for interrupting fault currents with delayed zero crossings
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Relay Circuits (AREA)
Abstract
629,541. Switching systems. NAAMLOOZE VENNOOTSCHAP PHILIPS' GLOEILAMPENFABRIEKEN. Oct. 10, 1946, No. 30308. Convention date, Feb. 2, 1943. [Class 38 (iv)] [Also in Group XXXVII] In an A.C. relay suitable for use in resistance welding wherein it is desirable that the relay should operate either synchronously, i.e. at a precise spot on the A.C. cycle in spite of variations in the moment at which energization begins or isochronously, i.e. at a definite time after the moment at which energization begins, even though the spot on the A.C. cycle of this moment may vary, the time constant of the relay is made smaller than an A.C. period. The relay may be in series with the anode circuit of a gas-filled or vapour-filled discharge tube which is subject to a voltage E, Fig. 2. The grid of the tube is subject to a voltage Es slightly more than 180 degrees out of phase with E. Thus ignition can only occur during the period t and this determines the moment at which energization of the relay begins. Fig. 1 shows how the slight variation of this moment within such a period as t need produce no appreciable change in the moment at which the relay operates or in the operative delay of the relay. In Fig. 1 E represents the energizing A.C. voltage that is going to be applied to the relay and I the lagging current in the relay which would occur if " starting conditions were disregarded. The actual current that flows through the relay will be the sum of this " permanent " current I and a " transient " current if or i<1>f, the latter being determined by the moment at which energization begins and its slope depending on the time constant. If the moment of energization occurs at time t the current will follow the curve i<1>; if at zero time, i.e. at the point A, it will follow the curve i. Considering the positive portions of the curves it will be noted that at any instant the value of il is greater than that of i in spite of its later start. The current level required to operate the relay is shown by W but the precise moment of operation will depend also on the design of the relay. By suitably choosing a design and providing a suitable time constant the relay can be made to operate either synchronously or isochronously.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL255559X | 1943-02-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB629541A true GB629541A (en) | 1949-09-22 |
Family
ID=19781287
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB30308/46A Expired GB629541A (en) | 1943-02-02 | 1946-10-10 | Improvements in or relating to electromagnetic relay systems for heavy alternating currents |
Country Status (4)
| Country | Link |
|---|---|
| CH (1) | CH255559A (en) |
| FR (1) | FR901682A (en) |
| GB (1) | GB629541A (en) |
| NL (1) | NL65149C (en) |
-
0
- NL NL65149D patent/NL65149C/xx active
-
1944
- 1944-01-31 CH CH255559D patent/CH255559A/en unknown
- 1944-01-31 FR FR901682D patent/FR901682A/en not_active Expired
-
1946
- 1946-10-10 GB GB30308/46A patent/GB629541A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CH255559A (en) | 1948-06-30 |
| NL65149C (en) | |
| FR901682A (en) | 1945-08-02 |
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