SE416757B - DEVICE CONNECTING TO AN AC POWER NETWORK TO FEEL THE VOLTAGE IN THIS AND TO PROVIDE AN OUTPUT VALUE PROPORTIONAL TO THE RELATIONSHIP BETWEEN THE NETWORK'S LINE POWER AND FREQUENCY - Google Patents
DEVICE CONNECTING TO AN AC POWER NETWORK TO FEEL THE VOLTAGE IN THIS AND TO PROVIDE AN OUTPUT VALUE PROPORTIONAL TO THE RELATIONSHIP BETWEEN THE NETWORK'S LINE POWER AND FREQUENCYInfo
- Publication number
- SE416757B SE416757B SE7903585A SE7903585A SE416757B SE 416757 B SE416757 B SE 416757B SE 7903585 A SE7903585 A SE 7903585A SE 7903585 A SE7903585 A SE 7903585A SE 416757 B SE416757 B SE 416757B
- Authority
- SE
- Sweden
- Prior art keywords
- voltage
- integration capacitor
- starting point
- network
- phase angle
- Prior art date
Links
Classifications
-
- 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
- G01R19/10—Measuring sum, difference or ratio
-
- 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
- G01R19/04—Measuring peak values or amplitude or envelope of ac or of pulses
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
- G01R31/343—Testing dynamo-electric machines in operation
-
- 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
- H02H3/46—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 frequency deviations
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Measurement Of Current Or Voltage (AREA)
- Protection Of Static Devices (AREA)
- Emergency Protection Circuit Devices (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Description
15 20 25 50 35 ?"9o3Sàš-3 På fig- 1 betecknar 10 och 11 två ingångsklämmor, på. vilka en värelspänning, Um, som àïr proportionell mot och likfomig med linjespmingen i ett växel- strömsnät är pâtryckt. männnan 11 är ansluten till växelspäzmingens 0-nivå., som är 'oeteoknad med 0. En integrator 1 är anordnad att matas av värelspän- ningen Uin. Integratorn innehåller en förstärkare 12 och en integrations- kondensator 13, som är anordnad mellan förstärksrens utgângsklämma ooh den negativa ingångsklännan. Kondensatorn 13 är parallellkopplsd med en elektro- nisk brytare 14 som är styrd med hjälp av en nolldetektor 15, om innehåller två. kaskadkopplade förstärkare 15' och 15". Nolldetektorn är med sin ingång ansluten till växelströmsnätet. Spänningen U15 mellan nolldetektorns utgång och O-nivån är visad på. fig- 2, där även kurvan för Um är visad. Den positiva delen av U15 tillföres en styrklänma hos den elektroniska brytaren 14 via en diod 16 som är parallellkopplad med ett motstånd 17 som mr så stor resistans att detta ensamt icke kan förmedla styrsigxsl till brytaren 14: Donna får icke styrsigzzal för slutning omedelbar-t vid nollgenomgång från plus till minus av spänningen IT15, utan med en kort fördröjning, eftersom en ändring av laddningstillstândet hos en fördröjningskondensatorfï' först måste äga man. 15 20 25 50 35? "9o3Sàš-3 In Figs. 1, 10 and 11 denote two input terminals, on which a current voltage, Um, which is proportional to and equal to the line voltage in an AC network is applied. The man 11 is connected to The 0 level of the AC voltage, which is undetected by 0. An integrator 1 is arranged to be supplied by the room voltage Uin. The integrator contains an amplifier 12 and an integration capacitor 13, which is arranged between the output terminal of the amplifier and the negative input terminal. 13 is connected in parallel with an electronic switch 14 which is controlled by means of a zero detector 15, if it contains two cascade-connected amplifiers 15 'and 15 ". The zero detector is connected to the AC mains with its input. The voltage U15 between the output of the zero detector and the O level is shown. Fig. 2, where the curve for Um is also shown. The positive part of the U15 is supplied to a control terminal of the electronic switch 14 via a diode 16 which is connected in parallel with a resistor 17 which has such a high resistance that it alone cannot transmit control signal to the switch 14: Donna does not receive control signal for closing immediately at zero passage from plus to minus of the voltage IT15, but with a short delay, since a change in the state of charge of a delay capacitor must first be owned.
Bortsett från fördröjningsintervallen, komer då. kondensatorn 13 att vara kortsluten under hela. den negativa halvperioden av växelspänningen Um. Ut- gângsspänningen U., hos integratorn 1 komer då att bli noll eller praktikt taget noll under varje negativ halvperiod av växelspänningen Um, vilket inne- bär att man integrerar Um mellan en begynnelsepxmkt i närheten av nollgenom- gång från minus till plus och en slutpunkt vid nästa nollgenomgâng. Värdet av denna integral representeras av spänningen u1 ma: över kondensatorn 14 vid laddningsintervallets slut och är proportionellt mot amplituden hos Um och mot periodtiden T. _- -_ ~ _ vi har amse u, m.. 1<1 um m 1.1.1 ma: n 1:1 UiIJf där f är växelströmsnätets frekvens.Aside from the delay intervals, come on. capacitor 13 to be short-circuited throughout. the negative half period of the alternating voltage Um. The output voltage U., of the integrator 1 will then be zero or practically zero during each negative half-period of the alternating voltage Um, which means integrating Um between an initial point in the vicinity of zero crossing from minus to plus and an end point at the next zero crossing. The value of this integral is represented by the voltage u1 ma: across the capacitor 14 at the end of the charging interval and is proportional to the amplitude of Um and to the period time T. _- -_ ~ _ we have amse u, m .. 1 <1 um m 1.1.1 ma: n 1: 1 UiIJf where f is the frequency of the AC network.
Man kan naturligtvis kontrollera att förhållandet mellan växelströmsnätets spänning och frekvens icke överskrider tillåtet värde genom att observera u1 ma: på. en oscillografskärm. Men vanligtvis önskar man ett utvärde i form av en med u, nu proportionell spänning. Detta uppnås då genom att spänningen u1 'ansluten till en marimalvärdesgivare. En dylik givare som ingår i den på. fig 1 visade anordningen, innehåller en elektronisk brytare 18, en deriverings- anordning 19, en kondensator 20, som är anordnad att kopiera spänningen 111 nu, och en proportionell förstärkare 21, som är anordnad att styras av spänningen över kopieringskondensatom 20. Derivstoranordningen 19 reagerar endast på. noll- 10 15 20 7903585-3 genomgången från plus till minus hos den av nellägeeindikatorn 15 levererade utgångsspänningen u15, och ger en motsvarande mycket kort epänningspuls, 1119, till styringången hos den elektroniska brytaren 18, som då slutes och hållas sluten under ett kort tidsintervell som motsvarar bredden av ovannämnda puls.One can of course check that the ratio between the voltage and frequency of the AC mains does not exceed the permissible value by observing u1 ma: on. an oscillograph screen. But usually you want an external value in the form of one with u, now proportional voltage. This is then achieved by connecting the voltage u1 'to a marimal value sensor. Such a sensor that is included in it on. Fig. 1, contains an electronic switch 18, a derivation device 19, a capacitor 20, which is arranged to copy the voltage 111 now, and a proportional amplifier 21, which is arranged to be controlled by the voltage across the copying capacitor 20. The derivative large device 19 reacts only on. zero through the plus to minus of the output voltage u15 supplied by the zero position indicator 15, and gives a corresponding very short opening voltage pulse, 1119, to the control input of the electronic switch 18, which is then closed and kept closed for a short time interval. corresponding to the width of the above pulse.
Kopieringskondensatom 20 får då i förhållande till O-nivån en potential som är lika med u1 max. Denna potential tillföras ingången hos förstärkaren 21, vars utspänning um då 'blir proportionell mot 111 max.The copying capacitor 20 then has a potential in relation to the O level which is equal to u1 max. This potential is applied to the input of the amplifier 21, the output voltage of which then becomes proportional to 111 max.
Den med hjälp av fig 5 och 4 illustrerade utföringsformen skiljer sig från den på fig 1 visade huvudsakligen genom att integrationekondensatom är överbryggad av ett likriktarelement i stället för den på fi; 1 visade elektroniska brytaren 14.The embodiment illustrated by means of Figs. 5 and 4 differs from that shown in Fig. 1 mainly in that the integration capacitor is bridged by a rectifier element instead of that in Figs. 1 shows the electronic switch 14.
På fig 5 betecknar 51 en intag-rater, 52 en noll-indikator, 55 en deriveringsanordnins. 54 en elektronisk brytare, 55, 56, 57 förstärkare, 58 och 59 kondensator-er, 40, 41 ooh 42 likrikterelement, medan 45, 44, 45, 46, 47 och 48 betecknar motstånd.In Fig. 5, 51 denotes an inverter, 52 a zero indicator, 55 a derivative device. 54 an electronic switch, 55, 56, 57 amplifiers, 58 and 59 capacitors, 40, 41 and 42 rectifier elements, while 45, 44, 45, 46, 47 and 48 denote resistors.
Nollindiketorn 52 och deriveringsenordningen 55 bilder tillsammans med den elektroniska. brytaren 54, kondensatoren 58 och förstärkaren 55 en toppdetektor, varvid förstärkarens 55 utgângsepänning H35 är proportionell med integretionskondensatoms 59* potential över en referensnivå. Under en negativ halvperiod av växelspänningen Um matas integratorn 31 av denna. Under spänningens positive. halvperiod urleddas integrations- kondensstorn 59 till referensnivån.The zero indicator 52 and the derivation device 55 images together with the electronic one. the switch 54, the capacitor 58 and the amplifier 55 a peak detector, the output voltage H35 of the amplifier 55 being proportional to the potential of the integrating capacitor 59 * over a reference level. During a negative half-period of the alternating voltage Um, the integrator 31 is supplied by it. During the positive of the voltage. half-period, the integration condensing tower 59 is discharged to the reference level.
Claims (6)
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE7903585A SE416757B (en) | 1979-04-24 | 1979-04-24 | DEVICE CONNECTING TO AN AC POWER NETWORK TO FEEL THE VOLTAGE IN THIS AND TO PROVIDE AN OUTPUT VALUE PROPORTIONAL TO THE RELATIONSHIP BETWEEN THE NETWORK'S LINE POWER AND FREQUENCY |
CH254780A CH650079A5 (en) | 1979-04-24 | 1980-04-01 | ARRANGEMENT THAT SENSES A VOLTAGE ON AN AC POWER NETWORK AND GIVES AN OUTPUT VALUE PROPORTIONAL TO THE RELATIONSHIP BETWEEN THE LINE VOLTAGE AND THE FREQUENCY OF THE NETWORK. |
DE19803014096 DE3014096A1 (en) | 1979-04-24 | 1980-04-12 | ARRANGEMENT FOR MEASURING THE RELATIONSHIP BETWEEN AMPLITUDE AND THE FREQUENCY OF THE AC VOLTAGE OF AN AC SYSTEM |
FR8008873A FR2455285A1 (en) | 1979-04-24 | 1980-04-21 | DEVICE CONNECTED TO AN AC POWER NETWORK FOR DETECTING A VOLTAGE IN THIS NETWORK AND PROVIDING AN INITIAL VALUE PROPORTIONAL TO THE RELATION BETWEEN LINE VOLTAGE AND FREQUENCY OF THE NETWORK |
GB8013451A GB2049959B (en) | 1979-04-24 | 1980-04-23 | Means for sensing the ratio between the line voltage and the frequency of an ac network |
CA000350515A CA1175487A (en) | 1979-04-24 | 1980-04-23 | Means for sensing the ratio between the line voltage and the frequency of an a.c. network |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE7903585A SE416757B (en) | 1979-04-24 | 1979-04-24 | DEVICE CONNECTING TO AN AC POWER NETWORK TO FEEL THE VOLTAGE IN THIS AND TO PROVIDE AN OUTPUT VALUE PROPORTIONAL TO THE RELATIONSHIP BETWEEN THE NETWORK'S LINE POWER AND FREQUENCY |
Publications (2)
Publication Number | Publication Date |
---|---|
SE7903585L SE7903585L (en) | 1980-10-25 |
SE416757B true SE416757B (en) | 1981-02-02 |
Family
ID=20337884
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SE7903585A SE416757B (en) | 1979-04-24 | 1979-04-24 | DEVICE CONNECTING TO AN AC POWER NETWORK TO FEEL THE VOLTAGE IN THIS AND TO PROVIDE AN OUTPUT VALUE PROPORTIONAL TO THE RELATIONSHIP BETWEEN THE NETWORK'S LINE POWER AND FREQUENCY |
Country Status (6)
Country | Link |
---|---|
CA (1) | CA1175487A (en) |
CH (1) | CH650079A5 (en) |
DE (1) | DE3014096A1 (en) |
FR (1) | FR2455285A1 (en) |
GB (1) | GB2049959B (en) |
SE (1) | SE416757B (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3044020A1 (en) * | 1980-11-22 | 1982-06-03 | Hermann Dr. 3171 Rötgesbüttel Lühr | Magnetometer with digital display - uses pulse integration and has premagnetising and induction coils on single core |
KR850000683A (en) * | 1983-06-30 | 1985-02-28 | 카다야마 히도하지로 | Voltage detection device of variable frequency power system |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3546534A (en) * | 1968-01-31 | 1970-12-08 | Gen Electric | Overexcitation relay |
US3717818A (en) * | 1972-01-10 | 1973-02-20 | J Herbst | Instantaneous voltage detector |
-
1979
- 1979-04-24 SE SE7903585A patent/SE416757B/en not_active IP Right Cessation
-
1980
- 1980-04-01 CH CH254780A patent/CH650079A5/en not_active IP Right Cessation
- 1980-04-12 DE DE19803014096 patent/DE3014096A1/en not_active Withdrawn
- 1980-04-21 FR FR8008873A patent/FR2455285A1/en active Granted
- 1980-04-23 GB GB8013451A patent/GB2049959B/en not_active Expired
- 1980-04-23 CA CA000350515A patent/CA1175487A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
GB2049959A (en) | 1980-12-31 |
CH650079A5 (en) | 1985-06-28 |
SE7903585L (en) | 1980-10-25 |
FR2455285A1 (en) | 1980-11-21 |
GB2049959B (en) | 1983-01-12 |
DE3014096A1 (en) | 1980-11-13 |
FR2455285B1 (en) | 1985-04-19 |
CA1175487A (en) | 1984-10-02 |
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