JPS55139079A - Method of changing over power source of ac electric machine - Google Patents

Method of changing over power source of ac electric machine

Info

Publication number
JPS55139079A
JPS55139079A JP4593479A JP4593479A JPS55139079A JP S55139079 A JPS55139079 A JP S55139079A JP 4593479 A JP4593479 A JP 4593479A JP 4593479 A JP4593479 A JP 4593479A JP S55139079 A JPS55139079 A JP S55139079A
Authority
JP
Japan
Prior art keywords
power source
electric machine
phase
interrupter
power
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
JP4593479A
Other languages
Japanese (ja)
Inventor
Takao Kawabata
Sadanari Yano
Yasuhiro Hara
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP4593479A priority Critical patent/JPS55139079A/en
Publication of JPS55139079A publication Critical patent/JPS55139079A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads

Abstract

PURPOSE:To reduce a rush current flowing through an AC electric apparatus by interrupting a power from the first power source of a variable frequency to an AC electric machine and idling the same, and thereafter supplying a power from a commercial power source to an AC electric machine in synchronism with the phase delayed at a predetermined angle from the first power source. CONSTITUTION:An interrupter 4 and a switch 6 are closed, and a reference signal in correspondence to a frequency fs of a commercial power source 2, imparted from a speed reference generating circuit 8 is afforded to an inverter 1 via an inclination signal generating circuit 9, and a power of a variable frequency increasing smoothly is supplied to an AC apparatus 3. When the acceleration is completed, a switch 6 is opened, and the phase of the inverter 1 is advanced by DELTAPSIR from the phase of the commercial source 2. Thereafter, the interrupter 4 is opened and the AC machine 3 is coasted, and a closing command is imparted so that the interrupter 5 is closed at a time the phase difference becomes zero.
JP4593479A 1979-04-13 1979-04-13 Method of changing over power source of ac electric machine Pending JPS55139079A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4593479A JPS55139079A (en) 1979-04-13 1979-04-13 Method of changing over power source of ac electric machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4593479A JPS55139079A (en) 1979-04-13 1979-04-13 Method of changing over power source of ac electric machine

Publications (1)

Publication Number Publication Date
JPS55139079A true JPS55139079A (en) 1980-10-30

Family

ID=12733086

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4593479A Pending JPS55139079A (en) 1979-04-13 1979-04-13 Method of changing over power source of ac electric machine

Country Status (1)

Country Link
JP (1) JPS55139079A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6139827A (en) * 1984-07-28 1986-02-26 三菱電機株式会社 Power source switching system
CN109921718A (en) * 2017-12-12 2019-06-21 日立楼宇技术（广州）有限公司 Escalator is exchanged work switches compensation angle method of adjustment and system frequently

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6139827A (en) * 1984-07-28 1986-02-26 三菱電機株式会社 Power source switching system
CN109921718A (en) * 2017-12-12 2019-06-21 日立楼宇技术（广州）有限公司 Escalator is exchanged work switches compensation angle method of adjustment and system frequently
CN109921718B (en) * 2017-12-12 2021-01-26 日立楼宇技术（广州）有限公司 Method and system for adjusting variable working frequency switching compensation angle of escalator

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