SE8801302L - PROCEDURE FOR DETERMINING THE PERIODIC ARRIVAL SYNCHRONIZATION TIME - Google Patents

PROCEDURE FOR DETERMINING THE PERIODIC ARRIVAL SYNCHRONIZATION TIME

Info

Publication number
SE8801302L
SE8801302L SE8801302A SE8801302A SE8801302L SE 8801302 L SE8801302 L SE 8801302L SE 8801302 A SE8801302 A SE 8801302A SE 8801302 A SE8801302 A SE 8801302A SE 8801302 L SE8801302 L SE 8801302L
Authority
SE
Sweden
Prior art keywords
edge
square wave
wave signal
phase
synchronization time
Prior art date
Application number
SE8801302A
Other languages
Unknown language ( )
Swedish (sv)
Other versions
SE8801302D0 (en
Inventor
D I E Sauper
Original Assignee
Elin Union Ag
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Elin Union Ag filed Critical Elin Union Ag
Publication of SE8801302D0 publication Critical patent/SE8801302D0/en
Publication of SE8801302L publication Critical patent/SE8801302L/en

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
    • G01R29/18—Indicating phase sequence; Indicating synchronism
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R25/00—Arrangements for measuring phase angle between a voltage and a current or between voltages or currents
    • G01R25/08—Arrangements for measuring phase angle between a voltage and a current or between voltages or currents by counting of standard pulses

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Unknown Time Intervals (AREA)
  • Measuring Phase Differences (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Measuring Frequencies, Analyzing Spectra (AREA)

Abstract

In order to be able properly to connect together two three-phase power systems or to be able to connect a generator to the three-phase power system, there must be synchronism. This is given when the voltages, the frequencies, the phase angle and the phase sequence of the voltages are equal. Since the frequencies always have a slight difference, a beat occurs. Thus, synchronization is in each case only possible at a certain time. The known synchronization methods and devices have the disadvantage that switching does not occur optimally at the synchronization time. The method according to the invention is based on a cyclic digital detection of the duration of the period (F0, F1) and the phase shift (P0, P1) between two square wave signals (1, 2) which have the same phase as the alternating voltages. In each cycle (8), a counter (23) counts from one to the next but one edge of one square wave signal (1), then from this edge to the next equivalent edge of the other square wave signal (2). Then counting takes place from this edge to the next but one edge of this square wave signal (2) and lastly to the next equivalent edge of one square wave signal (1). The next synchronization time is calculated by means of a program in the process computer from the stored counts. The novel method can be used for switching more accurately at the synchronization time when the switching delay times are included. <IMAGE>
SE8801302A 1987-04-09 1988-04-08 PROCEDURE FOR DETERMINING THE PERIODIC ARRIVAL SYNCHRONIZATION TIME SE8801302L (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT89287A AT393053B (en) 1987-04-09 1987-04-09 ARRANGEMENT FOR DETERMINING THE RECURRING SYNCHRONIZATION TIME

Publications (2)

Publication Number Publication Date
SE8801302D0 SE8801302D0 (en) 1988-04-08
SE8801302L true SE8801302L (en) 1988-10-10

Family

ID=3502235

Family Applications (1)

Application Number Title Priority Date Filing Date
SE8801302A SE8801302L (en) 1987-04-09 1988-04-08 PROCEDURE FOR DETERMINING THE PERIODIC ARRIVAL SYNCHRONIZATION TIME

Country Status (4)

Country Link
AT (1) AT393053B (en)
CH (1) CH676293A5 (en)
DE (1) DE3809199C2 (en)
SE (1) SE8801302L (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10128840A1 (en) 2001-06-15 2003-01-09 Otis Elevator Co Method and device for controlling the drive of a conveyor
DE10128839B4 (en) * 2001-06-15 2006-11-23 Otis Elevator Co., Farmington Method and device for controlling the drive of a conveyor

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1144897A (en) * 1965-06-21 1969-03-12 Rotax Ltd Method and apparatus for use when connecting together two a.c. supplies
DE1638582C3 (en) * 1967-06-20 1973-11-15 Siemens Ag, 1000 Berlin U. 8000 Muenchen Circuit arrangement for generating a signal at a frequency that occurs between two alternating voltages
ES380065A1 (en) * 1969-05-26 1972-08-16 Standard Electrica Sa Interruption free AC supply system - uses static inverters with independent oscillators having reference pulse generator, coincidence detector and reset pulse generator
DE2529943C3 (en) * 1975-07-02 1979-09-06 Siemens Ag, 1000 Berlin Und 8000 Muenchen Electronic circuit arrangement for connecting alternating current networks in parallel
GB1547360A (en) * 1975-12-01 1979-06-13 Gen Electric Co Ltd Apparatus for indicating the sequence of alternating current signals
AT345393B (en) * 1976-04-22 1978-09-11 Siemens Ag Oesterreich ELECTRONIC CIRCUIT ARRANGEMENT FOR PARALLEL SWITCHING OF AC NETWORKS
DE3025356A1 (en) * 1980-07-04 1982-01-21 Deutsche Itt Industries Gmbh, 7800 Freiburg CIRCUIT ARRANGEMENT FOR DIGITAL PHASE DIFFERENCE MEASUREMENT, THEIR USE IN A SYNCHRONIZER CIRCUIT AND THE CORRESPONDING SYNCHRONIZER CIRCUIT

Also Published As

Publication number Publication date
ATA89287A (en) 1990-12-15
DE3809199A1 (en) 1988-10-27
AT393053B (en) 1991-08-12
CH676293A5 (en) 1990-12-28
DE3809199C2 (en) 1994-02-10
SE8801302D0 (en) 1988-04-08

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Effective date: 19911101