Title:
HIGH-VOLTAGE INSULATION MONITORING DEVICE
Document Type and Number:
Japanese Patent JP2016206035
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a device for monitoring an insulation deterioration state of an in-plant high-voltage cable way in a hot line state.SOLUTION: A high-voltage insulation monitoring device uses current transformers 15 and 18 to detect a zero-phase current Iflowing through an in-plant high-voltage cable way 12 and a zero-phase current Iflowing through a shield line 14, and then measures earth fault resistance Rg on the basis of the zero-phase currents Iand I. The device measures the earth fault resistance Rg by: calculating in-plant ground admittance Ywith a relational expression of -Y=(I-I)ωC/(I-I)and also calculating in-plant ground admittance Y with a relational expression of -Y=(I-I)ωC/(I-I); calculating each-phase earth fault currents Iga, Igb and Igc with respect to the earth fault current Ig calculated from a real part Yr of the in-plant ground admittance Y; and calculating an odd power {ΣIg}in one root sum ΣIgof odd portions of the each-phase earth fault currents Iga, Igb and Igc, as a resistive earth fault current Igr.SELECTED DRAWING: Figure 4
Inventors:
INOUE YOSHIKAZU
Application Number:
JP2015088729A
Publication Date:
December 08, 2016
Filing Date:
April 23, 2015
Export Citation:
Assignee:
KANSAI ELECTRICAL SAFETY INSPECTION ASS
International Classes:
G01R27/18; G01R31/02
Domestic Patent References:
| JP2011137718A | 2011-07-14 | |||
| JP2011227020A | 2011-11-10 | |||
| JP2011209030A | 2011-10-20 | |||
| JP2001218360A | 2001-08-10 | |||
| JP2001095149A | 2001-04-06 | |||
| JPH03128471A | 1991-05-31 |
Foreign References:
| EP2490311A1 | 2012-08-22 | |||
| EP1870717A1 | 2007-12-26 |
Attorney, Agent or Firm:
Kunihiko Shiromura
Tsuyoshi Kumano
Tsuyoshi Kumano
Previous Patent: Radar installation
Next Patent: A gas meter system and a calorific value estimation method
Next Patent: A gas meter system and a calorific value estimation method