JPH01123164A - Open phase detector - Google Patents

Open phase detector

Info

Publication number
JPH01123164A
JPH01123164A JP62280602A JP28060287A JPH01123164A JP H01123164 A JPH01123164 A JP H01123164A JP 62280602 A JP62280602 A JP 62280602A JP 28060287 A JP28060287 A JP 28060287A JP H01123164 A JPH01123164 A JP H01123164A
Authority
JP
Japan
Prior art keywords
phase
power supply
photocoupler
rectifying
open 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.)
Granted
Application number
JP62280602A
Other languages
Japanese (ja)
Other versions
JPH065233B2 (en
Inventor
Toshimitsu Takagi
Atsuya Hida
Original Assignee
Fuji Electric Co 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 Fuji Electric Co Ltd filed Critical Fuji Electric Co Ltd
Priority to JP62280602A priority Critical patent/JPH065233B2/en
Publication of JPH01123164A publication Critical patent/JPH01123164A/en
Publication of JPH065233B2 publication Critical patent/JPH065233B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Abstract

PURPOSE: To easily detect the state of each phase of a power supply, by setting a part or the whole of the supply current of the rectifying arm of a rectifying circuit for rectifying the voltage of a multiphase AC power supply to the input current of a photocoupler and discriminating the open phase of the AC power supply on the basis of the disappearance of the output signal of the photocoupler.
CONSTITUTION: For example, when it is supposed that a three-phase power supply line P1 generates an open phase, only the single phase connection of three-phase power supply lines P2, P3 is formed and the DC power supplies obtained from positive and negative rectifying circuits 2P, 2N are not different from those at a usual time. Since no current flows to the line P1, that is, the rectifying arm corresponding to P12, that is, a diode D11 or D12, the photodiode PD1 in a photocoupler PC1 becomes a non-lighting state and the phototransistor PTr 1 in the photocoupler PC1 is not operated and the open phase state of the three-phase power supply line P1 is informed to the port (a) of an MPU 5 through an open phase detection signal 8a and an open phase alarm apparatus 6 is operated. By this method, the state of each phase of the power supply can be easily detected.
COPYRIGHT: (C)1989,JPO&Japio
JP62280602A 1987-11-06 1987-11-06 Phase loss detector Expired - Lifetime JPH065233B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62280602A JPH065233B2 (en) 1987-11-06 1987-11-06 Phase loss detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62280602A JPH065233B2 (en) 1987-11-06 1987-11-06 Phase loss detector

Publications (2)

Publication Number Publication Date
JPH01123164A true JPH01123164A (en) 1989-05-16
JPH065233B2 JPH065233B2 (en) 1994-01-19

Family

ID=17627319

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62280602A Expired - Lifetime JPH065233B2 (en) 1987-11-06 1987-11-06 Phase loss detector

Country Status (1)

Country Link
JP (1) JPH065233B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001296324A (en) * 2000-04-18 2001-10-26 Yaskawa Electric Corp Sensing circuit for open phase of three-phase power supply

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001296324A (en) * 2000-04-18 2001-10-26 Yaskawa Electric Corp Sensing circuit for open phase of three-phase power supply

Also Published As

Publication number Publication date
JPH065233B2 (en) 1994-01-19

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