FR2345725A2 - AC supply failure to three phase motor - is sensed by unbalance of magnetic field surrounding magnetisable switch - Google Patents
AC supply failure to three phase motor - is sensed by unbalance of magnetic field surrounding magnetisable switchInfo
- Publication number
- FR2345725A2 FR2345725A2 FR7608478A FR7608478A FR2345725A2 FR 2345725 A2 FR2345725 A2 FR 2345725A2 FR 7608478 A FR7608478 A FR 7608478A FR 7608478 A FR7608478 A FR 7608478A FR 2345725 A2 FR2345725 A2 FR 2345725A2
- Authority
- FR
- France
- Prior art keywords
- magnetisable
- switch
- phase
- unbalance
- sensed
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/12—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to underload or no-load
- H02H3/13—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to underload or no-load for multiphase applications, e.g. phase interruption
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16504—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the components employed
- G01R19/16509—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the components employed using electromagnetic relays, e.g. reed relay
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/027—Details with automatic disconnection after a predetermined time
Abstract
Magnetisable flexible blade switches enclosed in glass phials surrounded by a winding and normally used in d.c. circuits. By arranging that half wave rectified currents and phase shifted half wave rectified currents flow in the coils to generate magnetic fields in the same sense, they can be used for protection of three phase motors. A magnetisable flexible blade switch (2) is enclosed in a glass phial (1) on which coils are wound for each mains supply phase. Each coil comprises two half windings (3, 4) and each half winding is connected through a diode (5) to the same supply phase. The windings are positioned to generate magnetic fields in the same sense, thus a fault in one phase causes the switch to operate.
Priority Applications (20)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7608478A FR2345725A2 (en) | 1976-03-24 | 1976-03-24 | AC supply failure to three phase motor - is sensed by unbalance of magnetic field surrounding magnetisable switch |
SE7606633A SE419810B (en) | 1975-06-23 | 1976-06-11 | DEVICE SENSOR DEVICE |
GB24516/76A GB1549631A (en) | 1975-06-23 | 1976-06-14 | Electrical protection circuits |
DE19762626620 DE2626620A1 (en) | 1975-06-23 | 1976-06-14 | CIRCUIT ARRANGEMENT FOR DETERMINING AN AC CURRENT |
IE1290/76A IE42861B1 (en) | 1975-06-23 | 1976-06-15 | Improvements in and relating to electrical protection circuits |
AU14939/76A AU501326B2 (en) | 1975-06-23 | 1976-06-16 | Detecting alternating current |
US05/696,705 US4064546A (en) | 1975-06-23 | 1976-06-16 | Protection circuits |
NL7606588A NL7606588A (en) | 1975-06-23 | 1976-06-17 | PROCEDURE FOR DETECTING AC POWER. |
AR263663A AR212864A1 (en) | 1975-06-23 | 1976-06-18 | PROTECTION CIRCUIT TO PROTECT AN ELECTRICAL DEVICE |
JP51073737A JPS601808B2 (en) | 1975-06-23 | 1976-06-21 | Open phase detection method |
NO762148A NO762148L (en) | 1975-06-23 | 1976-06-21 | |
DK280476A DK280476A (en) | 1975-06-23 | 1976-06-22 | PROCEDURE FOR DETECTING AN AC |
IT68529/76A IT1063164B (en) | 1975-06-23 | 1976-06-22 | ELECTRIC PROTECTION CIRCUIT..PARTICULARLY FOR THREE-PHASE MOTORS |
ES449119A ES449119A1 (en) | 1975-06-23 | 1976-06-22 | Protection circuits |
CA255,396A CA1080842A (en) | 1975-06-23 | 1976-06-22 | Protection circuits |
DD193507A DD124756A5 (en) | 1975-06-23 | 1976-06-22 | |
LU75210A LU75210A1 (en) | 1975-06-23 | 1976-06-22 | |
CH796876A CH618273A5 (en) | 1975-06-23 | 1976-06-22 | |
FI761831A FI761831A (en) | 1975-06-23 | 1976-06-23 | |
BR7604088A BR7604088A (en) | 1975-06-23 | 1976-06-23 | PROCEDURE FOR THE DETECTION OF AN ALTERNATE CURRENT |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7608478A FR2345725A2 (en) | 1976-03-24 | 1976-03-24 | AC supply failure to three phase motor - is sensed by unbalance of magnetic field surrounding magnetisable switch |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2345725A2 true FR2345725A2 (en) | 1977-10-21 |
FR2345725B2 FR2345725B2 (en) | 1980-04-04 |
Family
ID=9170853
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7608478A Granted FR2345725A2 (en) | 1975-06-23 | 1976-03-24 | AC supply failure to three phase motor - is sensed by unbalance of magnetic field surrounding magnetisable switch |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR2345725A2 (en) |
-
1976
- 1976-03-24 FR FR7608478A patent/FR2345725A2/en active Granted
Also Published As
Publication number | Publication date |
---|---|
FR2345725B2 (en) | 1980-04-04 |
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