JPS5449548A - Method of protecting induction motor - Google Patents

Method of protecting induction motor

Info

Publication number
JPS5449548A
JPS5449548A JP11520077A JP11520077A JPS5449548A JP S5449548 A JPS5449548 A JP S5449548A JP 11520077 A JP11520077 A JP 11520077A JP 11520077 A JP11520077 A JP 11520077A JP S5449548 A JPS5449548 A JP S5449548A
Authority
JP
Japan
Prior art keywords
value
current
time
motor
setter
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
JP11520077A
Other languages
Japanese (ja)
Inventor
Kazuhiro Sugi
Original Assignee
Toshiba 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 Toshiba Corp filed Critical Toshiba Corp
Priority to JP11520077A priority Critical patent/JPS5449548A/en
Publication of JPS5449548A publication Critical patent/JPS5449548A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: When a DC damping current continues to flow to a motor, to detect it to pulse interrupt a thyristor inverter, thereby to protect the motor.
CONSTITUTION: A load current which has been detected by a shunt 21 is insulated by an insulator 22, and supplied as input to an integrator 24. This output signal is compared with a set value of a setter 26, and when the output becomes large, a thyristor inverter 1 is gate-interrupted through a gate interruption logical circuit 27 thereby to interrupt the current. Since at the time of DC damping, a predetermined positive value is continuously imparted to the input signal of the integrator 24, the integral output increases with the lapse of time, and when it exceeds the set value of the setter 26, which value has been determined by the DC value and the current flowing time, the detecting operation is carried out
COPYRIGHT: (C)1979,JPO&Japio
JP11520077A 1977-09-27 1977-09-27 Method of protecting induction motor Pending JPS5449548A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11520077A JPS5449548A (en) 1977-09-27 1977-09-27 Method of protecting induction motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11520077A JPS5449548A (en) 1977-09-27 1977-09-27 Method of protecting induction motor

Publications (1)

Publication Number Publication Date
JPS5449548A true JPS5449548A (en) 1979-04-18

Family

ID=14656823

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11520077A Pending JPS5449548A (en) 1977-09-27 1977-09-27 Method of protecting induction motor

Country Status (1)

Country Link
JP (1) JPS5449548A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11158861B2 (en) 2018-02-28 2021-10-26 The Furukawa Battery Co., Ltd. Positive electrode grid body for lead-acid battery, and lead-acid battery

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11158861B2 (en) 2018-02-28 2021-10-26 The Furukawa Battery Co., Ltd. Positive electrode grid body for lead-acid battery, and lead-acid battery

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