JPS5780568A - Measuring system for insulation resistance - Google Patents

Measuring system for insulation resistance

Info

Publication number
JPS5780568A
JPS5780568A JP15669180A JP15669180A JPS5780568A JP S5780568 A JPS5780568 A JP S5780568A JP 15669180 A JP15669180 A JP 15669180A JP 15669180 A JP15669180 A JP 15669180A JP S5780568 A JPS5780568 A JP S5780568A
Authority
JP
Japan
Prior art keywords
insulation resistance
voltage signal
output
return current
adding amplifier
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
JP15669180A
Other languages
Japanese (ja)
Inventor
Koichi Sato
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.)
Fuji Electric Co Ltd
Original Assignee
Fuji Electric Co Ltd
Fuji Electric Manufacturing 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, Fuji Electric Manufacturing Co Ltd filed Critical Fuji Electric Co Ltd
Priority to JP15669180A priority Critical patent/JPS5780568A/en
Publication of JPS5780568A publication Critical patent/JPS5780568A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Resistance Or Impedance (AREA)

Abstract

PURPOSE:To improve measuring accuracy, by a method wherein insulation resistance is measured in hot line using a grounding type instrument transformer, and an adding amplifier is used to subtract voltage signal detected by detection resistance from voltage signal generated by an oscillator. CONSTITUTION:Return current i10 flowing in neutral line of a grounding type instrument transformer 7 is detected. Voltage signal obtained by multiplying the return current i10 at a prescribed ratio is subtracted from voltage signal generated by an oscillator 2 at an adding amplifier 13. Output of the adding amplifier 13 represents V1 across an insulation resistance 11 in considerable accuracy, and the output is introduced to a multiplying circuit 5 so as to multiply with detecting signal of the return current i10 thereby output being inversely proportional to the insulation resistance 11 accurately is obtained. In this constitution, insulation resistance can be accurately measured without being affected by stray capacity.
JP15669180A 1980-11-07 1980-11-07 Measuring system for insulation resistance Pending JPS5780568A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15669180A JPS5780568A (en) 1980-11-07 1980-11-07 Measuring system for insulation resistance

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15669180A JPS5780568A (en) 1980-11-07 1980-11-07 Measuring system for insulation resistance

Publications (1)

Publication Number Publication Date
JPS5780568A true JPS5780568A (en) 1982-05-20

Family

ID=15633218

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15669180A Pending JPS5780568A (en) 1980-11-07 1980-11-07 Measuring system for insulation resistance

Country Status (1)

Country Link
JP (1) JPS5780568A (en)

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