JPS5497721A - Step-out detector - Google Patents

Step-out detector

Info

Publication number
JPS5497721A
JPS5497721A JP421278A JP421278A JPS5497721A JP S5497721 A JPS5497721 A JP S5497721A JP 421278 A JP421278 A JP 421278A JP 421278 A JP421278 A JP 421278A JP S5497721 A JPS5497721 A JP S5497721A
Authority
JP
Japan
Prior art keywords
generator
motor
rectangular wave
differenciating
outputed
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.)
Pending
Application number
JP421278A
Other languages
Japanese (ja)
Inventor
Kazuaki Hirano
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.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP421278A priority Critical patent/JPS5497721A/en
Publication of JPS5497721A publication Critical patent/JPS5497721A/en
Pending legal-status Critical Current

Links

Landscapes

  • Protection Of Generators And Motors (AREA)
  • Motor And Converter Starters (AREA)

Abstract

PURPOSE: To enable reliable detection of step-out by performing the detection of the step-out on the basis of rectangular wave corresponding to two times of electric angle for determining to be step-out from the pulse obtained in accordance with the rotation of the generator and the motor.
CONSTITUTION: Upon the rotation of morot G and generator M, pulses having width corresponding to 90° of the electric angle are supplied from the projection detectors 7, 9 and converted by frequency dividers 12, 13 and 14, 15 into rectangular waves having width corresponding to 360° of electric angle. When the generator G is synchronised with the motor M, there is phase difference of 180° between the differenciating pulse produced at the rising of rectangular wave outputed from frequency dividing circuit 15 and the rectangular wave outputed from frequncy dividing circuit 13 thereby relay 19 doesn't function. When the motor M steps out to shift the motor M more than 180° from the generator G, the differenciating pulse from the differenciating circuit 16 is overlapped with the rectangular wave outputed from the frequency dividing circuit 13, to set the flipflop circuit 18 thus to function the relay 19.
COPYRIGHT: (C)1979,JPO&Japio
JP421278A 1978-01-20 1978-01-20 Step-out detector Pending JPS5497721A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP421278A JPS5497721A (en) 1978-01-20 1978-01-20 Step-out detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP421278A JPS5497721A (en) 1978-01-20 1978-01-20 Step-out detector

Publications (1)

Publication Number Publication Date
JPS5497721A true JPS5497721A (en) 1979-08-02

Family

ID=11578309

Family Applications (1)

Application Number Title Priority Date Filing Date
JP421278A Pending JPS5497721A (en) 1978-01-20 1978-01-20 Step-out detector

Country Status (1)

Country Link
JP (1) JPS5497721A (en)

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