JPS5682458A - Insulation resistance measuring apparatus of neutral point ground system - Google Patents

Insulation resistance measuring apparatus of neutral point ground system

Info

Publication number
JPS5682458A
JPS5682458A JP15918079A JP15918079A JPS5682458A JP S5682458 A JPS5682458 A JP S5682458A JP 15918079 A JP15918079 A JP 15918079A JP 15918079 A JP15918079 A JP 15918079A JP S5682458 A JPS5682458 A JP S5682458A
Authority
JP
Japan
Prior art keywords
transformer
neutral point
phase difference
insulation resistance
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.)
Pending
Application number
JP15918079A
Other languages
Japanese (ja)
Inventor
Ikuro Miyashita
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 JP15918079A priority Critical patent/JPS5682458A/en
Publication of JPS5682458A publication Critical patent/JPS5682458A/en
Pending legal-status Critical Current

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  • Measurement Of Resistance Or Impedance (AREA)

Abstract

PURPOSE: To eliminate the need for any auxilary power source and make possible the monitoring of the degradation in insulation in a hot-line state by detecting the zero phase voltage and neutral point current of an electric system, and measuring insulation resistance from the phase difference thereof.
CONSTITUTION: The neutral point of a 3-phase AC generator 1 is grounded via a ground resistance 2 and an instrument current transformer 3, while the secondary side of the current transformer 3 is connected to a phase difference detector 5 via a filter 4. On the other hand, the primary side of a ground type potential transformer 6 is connected to the 3-phase line of the system, and the secondary side of the transformer 6 is connected to the device 5 via a filter 7; further, a voltmeter 8 is connected thereto. Then, the phase difference of the respecrive components obtained by removing frequency components other than specific frequency from the outputs of the current transformer 3 and the transformer 6 respectively via the filters 4, 7 is measured with the device 6, and the insulation resistance is calculated based on this phase difference.
COPYRIGHT: (C)1981,JPO&Japio
JP15918079A 1979-12-10 1979-12-10 Insulation resistance measuring apparatus of neutral point ground system Pending JPS5682458A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15918079A JPS5682458A (en) 1979-12-10 1979-12-10 Insulation resistance measuring apparatus of neutral point ground system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15918079A JPS5682458A (en) 1979-12-10 1979-12-10 Insulation resistance measuring apparatus of neutral point ground system

Publications (1)

Publication Number Publication Date
JPS5682458A true JPS5682458A (en) 1981-07-06

Family

ID=15688041

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15918079A Pending JPS5682458A (en) 1979-12-10 1979-12-10 Insulation resistance measuring apparatus of neutral point ground system

Country Status (1)

Country Link
JP (1) JPS5682458A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01107175A (en) * 1987-10-20 1989-04-25 Showa Electric Wire & Cable Co Ltd Apparatus for measuring tandelta of hot line
JPH02208573A (en) * 1989-02-09 1990-08-20 Shikoku Sogo Kenkyusho:Kk Method for measuring dielectric loss of cable
JPH04132969A (en) * 1990-09-26 1992-05-07 Midori Denshi Kk Apparatus for measuring leakage current
KR100918515B1 (en) 2009-01-12 2009-09-24 조승기 Method for measuring earth resistance of a single ground in active state

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01107175A (en) * 1987-10-20 1989-04-25 Showa Electric Wire & Cable Co Ltd Apparatus for measuring tandelta of hot line
JPH02208573A (en) * 1989-02-09 1990-08-20 Shikoku Sogo Kenkyusho:Kk Method for measuring dielectric loss of cable
JPH04132969A (en) * 1990-09-26 1992-05-07 Midori Denshi Kk Apparatus for measuring leakage current
KR100918515B1 (en) 2009-01-12 2009-09-24 조승기 Method for measuring earth resistance of a single ground in active state

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