JPS56119860A - Insulation measuring method for single-phase three-wire circuit - Google Patents

Insulation measuring method for single-phase three-wire circuit

Info

Publication number
JPS56119860A
JPS56119860A JP2345180A JP2345180A JPS56119860A JP S56119860 A JPS56119860 A JP S56119860A JP 2345180 A JP2345180 A JP 2345180A JP 2345180 A JP2345180 A JP 2345180A JP S56119860 A JPS56119860 A JP S56119860A
Authority
JP
Japan
Prior art keywords
phase
zct
wire circuit
poor insulation
wires
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
JP2345180A
Other languages
Japanese (ja)
Other versions
JPH027032B2 (en
Inventor
Fumio Iwasaki
Seiichi Watanabe
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.)
KANTO DENKI HOAN KYOKAI
KANTOU DENKI HOAN KIYOUKAI
Midori Anzen Co Ltd
Original Assignee
KANTO DENKI HOAN KYOKAI
KANTOU DENKI HOAN KIYOUKAI
Midori Anzen 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 KANTO DENKI HOAN KYOKAI, KANTOU DENKI HOAN KIYOUKAI, Midori Anzen Co Ltd filed Critical KANTO DENKI HOAN KYOKAI
Priority to JP2345180A priority Critical patent/JPS56119860A/en
Publication of JPS56119860A publication Critical patent/JPS56119860A/en
Publication of JPH027032B2 publication Critical patent/JPH027032B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/52—Testing for short-circuits, leakage current or ground faults

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
  • Measurement Of Resistance Or Impedance (AREA)

Abstract

PURPOSE:To detect poor insulation even if two wires are poor insulation, by flowing an exciting current to a single-phase three-wire circuit by an inductance element and by measuring a leakage current before and after said operation. CONSTITUTION:Inductance element L and zero-phase rectifier ZCT are interposed in single-phase three-wire circuit 1 and switch S flowing an exciting current via resistance R0 is provided. As a result, even if two wires of circuit 1 becomes poor insulation having nearly equal resistance values Rg1 and Rg2 and that can not be detected by ZCT, Ig1' and Ig2' differ in value by inducing voltage (v) at respective phases R, S and T through turning on the switch S, so that ZCT can detect the defection. In this case, voltages V3 and V4 between respective lines are unchanged, so a load is not forced excessively and any special power supply for testing is not necessary.
JP2345180A 1980-02-28 1980-02-28 Insulation measuring method for single-phase three-wire circuit Granted JPS56119860A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2345180A JPS56119860A (en) 1980-02-28 1980-02-28 Insulation measuring method for single-phase three-wire circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2345180A JPS56119860A (en) 1980-02-28 1980-02-28 Insulation measuring method for single-phase three-wire circuit

Publications (2)

Publication Number Publication Date
JPS56119860A true JPS56119860A (en) 1981-09-19
JPH027032B2 JPH027032B2 (en) 1990-02-15

Family

ID=12110856

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2345180A Granted JPS56119860A (en) 1980-02-28 1980-02-28 Insulation measuring method for single-phase three-wire circuit

Country Status (1)

Country Link
JP (1) JPS56119860A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007121028A (en) * 2005-10-26 2007-05-17 Hitachi Building Systems Co Ltd Insulation resistance diagnostic system

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4933750A (en) * 1972-07-31 1974-03-28

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4933750A (en) * 1972-07-31 1974-03-28

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007121028A (en) * 2005-10-26 2007-05-17 Hitachi Building Systems Co Ltd Insulation resistance diagnostic system

Also Published As

Publication number Publication date
JPH027032B2 (en) 1990-02-15

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