GB1494202A - Monitoring a drive system - Google Patents

Monitoring a drive system

Info

Publication number
GB1494202A
GB1494202A GB1823974A GB1823974A GB1494202A GB 1494202 A GB1494202 A GB 1494202A GB 1823974 A GB1823974 A GB 1823974A GB 1823974 A GB1823974 A GB 1823974A GB 1494202 A GB1494202 A GB 1494202A
Authority
GB
United Kingdom
Prior art keywords
fed
squarer
limit value
predetermined limit
phase
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
Application number
GB1823974A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
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
Priority claimed from DE19742402423 external-priority patent/DE2402423C3/en
Application filed by Siemens AG filed Critical Siemens AG
Publication of GB1494202A publication Critical patent/GB1494202A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H02H3/38—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 both voltage and current; responsive to phase angle between voltage and current
    • H02H3/382—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 both voltage and current; responsive to phase angle between voltage and current involving phase comparison between current and voltage or between values derived from current and voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H02H7/0805—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors for synchronous motors
    • 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
    • G01R31/40—Testing power supplies
    • G01R31/42—AC power supplies

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Control Of Electric Motors In General (AREA)
  • Control Of Multiple Motors (AREA)
  • Protection Of Generators And Motors (AREA)
  • Control Of Ac Motors In General (AREA)
  • Centrifugal Separators (AREA)

Abstract

1494202 Protecting motor installations SIEMENS AG 25 April 1974 [18 Jan 1974] 18239/74 Heading H2K In a method of monitoring a number of hysteresis or reluctance electric motors (2, 3, 4) each driving a low-friction centrifuge and fed together from an A.C. source, the angle (#, #) between the voltage (up, u) and current (i 1 , i 2 , i 3 ) of each motor is successively measured and compared with a predetermined limit value (#*, #*) and when the angle is below the predetermined limit an indicating signal s 1 is released and/or when thereabove a further indicating signal s 2 is released. The invention is particularly applied to hysteresis motors employed in a uranium-isotope separating gas centrifuge installation, and the limit value is that which separates asynchronous from synchronous operation. A 1 kc/s. A.C. supply with phase conductors U, V, W and neutral Mp is provided by a controlled frequency changer 14 energized from a conventional mains supply 15. Signal s 1 production indicates asynchronous operation and s 2 , synchronous operation; these signals may be applied to an indicating or alarm system. Digital phase measurement.-Voltage u is fed to a squarer 20 whose zero-crossings correspond to those of the sinusoidal input and the outputs of current transformers 22, 23, 24 are selectively fed via field-effect transistor switches to a similar squarer 32. A time-difference measuring circuit 21 affords a measure of phase displaced by 30 degrees (phase displacement due to placement of tap 18 and the arrangement of the current transformers) and a comparator 33 compares (#-30 degrees) with a predetermined value set by potentiometer 34. In a further, preferred, embodiment, the output of squarer 20 is fed to a device (40, Fig. 3, not shown) which introduces a delay controlled by the predetermined limit value and a NAND gate (42) is utilized as a comparator.
GB1823974A 1974-01-18 1974-04-25 Monitoring a drive system Expired GB1494202A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19742402423 DE2402423C3 (en) 1974-01-18 Method for monitoring a drive system with a number of induction machines and monitoring circuit for carrying out the method

Publications (1)

Publication Number Publication Date
GB1494202A true GB1494202A (en) 1977-12-07

Family

ID=5905131

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1823974A Expired GB1494202A (en) 1974-01-18 1974-04-25 Monitoring a drive system

Country Status (3)

Country Link
JP (1) JPS5627200B2 (en)
GB (1) GB1494202A (en)
NL (1) NL7405749A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2128425A (en) * 1982-10-08 1984-04-26 Newelec Pretoria Stall detection apparatus
GB2159671A (en) * 1984-04-04 1985-12-04 Jungheinrich Kg Battery charging
GB2168497A (en) * 1984-12-18 1986-06-18 Toshiba Kk Load state detecting apparatus of an induction motor
EP0276401A2 (en) * 1983-07-11 1988-08-03 Square D Company Mechanically operated pressure switch having solid state components
DE4430557A1 (en) * 1994-08-30 1996-03-14 Seifert Electronic R AC Motor-driven fan or compressor rotational speed measurement +

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4519942Y1 (en) * 1965-06-04 1970-08-12

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2128425A (en) * 1982-10-08 1984-04-26 Newelec Pretoria Stall detection apparatus
EP0276401A2 (en) * 1983-07-11 1988-08-03 Square D Company Mechanically operated pressure switch having solid state components
EP0276401A3 (en) * 1983-07-11 1989-04-12 Square D Company Mechanically operated pressure switch having solid state components
GB2159671A (en) * 1984-04-04 1985-12-04 Jungheinrich Kg Battery charging
GB2168497A (en) * 1984-12-18 1986-06-18 Toshiba Kk Load state detecting apparatus of an induction motor
AU569646B2 (en) * 1984-12-18 1988-02-11 Toshiba, Kabushiki Kaisha Detecting critical rotation speed of an induction motor
GB2168497B (en) * 1984-12-18 1989-03-30 Toshiba Kk Load state detecting apparatus of an induction motor
US4853605A (en) * 1984-12-18 1989-08-01 Kabushiki Kaisha Toshiba Load state detecting apparatus of an induction motor for controlling the spin dryer of a washing machine
DE4430557A1 (en) * 1994-08-30 1996-03-14 Seifert Electronic R AC Motor-driven fan or compressor rotational speed measurement +
DE4430557C2 (en) * 1994-08-30 1998-03-19 Seifert Electronic R Method for determining the speed behavior of a fan and arrangement for carrying out this method

Also Published As

Publication number Publication date
DE2402423B2 (en) 1977-02-03
JPS5627200B2 (en) 1981-06-23
NL7405749A (en) 1976-03-31
DE2402423A1 (en) 1976-04-15
JPS50107415A (en) 1975-08-23

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee