Title:
【発明の名称】高電圧機器の絶縁状態監視装置
Document Type and Number:
Japanese Patent JP3082132
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To realize a monitoring device which is applied to a high-voltage apparatus and to various degradation patterns and by which an insulating state can be monitored and judged accurately. SOLUTION: A CTL (a low-frequency current transformer) 4 and a CTH (a high-frequency current transformer) 5 are installed at a first-kind grounding line 3 at a high- voltage apparatus 2. An insulating-state monitoring device 1, to which the detection current of the CTL 4 is input, detects data on the current value in one cycle of a high-voltage-apparatus application voltage of a leakage current by a leakage-current detection means 20, it stores the data into a memory L 10, it detects data on the peak value and on the generation timing of every peak of a pulse current due to a partial discharge by using a partial-discharge detection means 21, and it stores the data into a memory H 16. Then, a control means by a microcomputer 11 computes a leakage current value on the basis of data on the leakage current, it computes a maximum, discharge amount, a total-discharge electric charge amount, the number of discharge pulses and a discharge phase due to the partial discharge on the basis of data on the partial discharge, and it judges an insulation abnormality when a prescribed value for judgment is exceeded in them.
Inventors:
Masao Murata
Koichi Hirakawa
Yoshiji Kagohara
Koichi Hirakawa
Yoshiji Kagohara
Application Number:
JP21531995A
Publication Date:
August 28, 2000
Filing Date:
July 31, 1995
Export Citation:
Assignee:
Matsushita Electric Industrial Co., Ltd
International Classes:
H01F27/00; G01R31/12; (IPC1-7): H01F27/00
Attorney, Agent or Firm:
Shigetaka Awano