IT1009769B - FREQUENCY CONTROL RELAY - Google Patents

FREQUENCY CONTROL RELAY

Info

Publication number
IT1009769B
IT1009769B IT2114074A IT2114074A IT1009769B IT 1009769 B IT1009769 B IT 1009769B IT 2114074 A IT2114074 A IT 2114074A IT 2114074 A IT2114074 A IT 2114074A IT 1009769 B IT1009769 B IT 1009769B
Authority
IT
Italy
Prior art keywords
frequency control
control relay
relay
frequency
control
Prior art date
Application number
IT2114074A
Other languages
Italian (it)
Original Assignee
Siemens 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 Siemens Ag filed Critical Siemens Ag
Application granted granted Critical
Publication of IT1009769B publication Critical patent/IT1009769B/en

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
    • H02H3/46—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
    • 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
    • G01R29/02—Measuring characteristics of individual pulses, e.g. deviation from pulse flatness, rise time or duration
    • G01R29/027—Indicating that a pulse characteristic is either above or below a predetermined value or within or beyond a predetermined range of values
    • G01R29/0273—Indicating that a pulse characteristic is either above or below a predetermined value or within or beyond a predetermined range of values the pulse characteristic being duration, i.e. width (indicating that frequency of pulses is above or below a certain limit)

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Frequencies, Analyzing Spectra (AREA)
IT2114074A 1973-04-11 1974-04-09 FREQUENCY CONTROL RELAY IT1009769B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19732318876 DE2318876C3 (en) 1973-04-11 1973-04-11 Frequency relay

Publications (1)

Publication Number Publication Date
IT1009769B true IT1009769B (en) 1976-12-20

Family

ID=5878073

Family Applications (1)

Application Number Title Priority Date Filing Date
IT2114074A IT1009769B (en) 1973-04-11 1974-04-09 FREQUENCY CONTROL RELAY

Country Status (5)

Country Link
CH (1) CH569980A5 (en)
DE (1) DE2318876C3 (en)
IT (1) IT1009769B (en)
NL (1) NL7404255A (en)
SE (1) SE396480B (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1094302A (en) * 1964-03-12 1967-12-06 Plessey Uk Ltd Improvements in or relating to frequency sensing systems
DE1466657A1 (en) * 1964-04-08 1972-02-17 Westinghouse Canada Ltd Circuit arrangement for determining frequency deviations
GB1082975A (en) * 1964-05-07 1967-09-13 Plessey Uk Ltd Apparatus for frequency and phase comparison of two periodic signals
GB1279611A (en) * 1968-07-01 1972-06-28 George William Gurry Improvements in circuit arrangements

Also Published As

Publication number Publication date
DE2318876B2 (en) 1976-07-15
NL7404255A (en) 1974-10-15
SE396480B (en) 1977-09-19
DE2318876C3 (en) 1983-04-28
DE2318876A1 (en) 1974-10-24
CH569980A5 (en) 1975-11-28

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