Abnormality diagnosing system and method for a high voltage power apparatus

• US 5,214,595 A
• Filed: 11/07/1991
• Issued: 05/25/1993
• Est. Priority Date: 05/16/1988
• Status: Expired due to Term

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Yamada, Hiroshi, Yamada, Izumi, Ohshita, Youichi, Sawairi, Mitsuo, Ozawa, Jun, Endo, Fumihiro, Yamagiwa, Tokio, Nagai, Hashime
• Primary Examiner(s): Lall, Parshotam S.
• Assistant Examiner(s): ZANELLI, MICHAEL J
• Application Number:
  US07/796,057
• Time in Patent Office: 565 Days
• Field of Search: 364/550, 364/551.01, 364/492, 364/802, 364/481, 364/484, 364/485, 324/536, 324/541, 324/544, 324/551, 324/557, 361/111, 361/113, 340/644, 340/647
• US Class Current: 702/58
• CPC Class Codes: G01R 15/142 Arrangements for simultaneous measurements of several parameters employing techniques covered by groups G01R15/14 - G01R15/26
• CPC Class Codes: G01R 31/1254 of gas-insulated power appliances or vacuum gaps testing switches G01R31/327; detecting electrical or mechanical defects in encased switchgear H02B13/065
• CPC Class Codes: H02B 13/065 Means for detecting or reacting to mechanical or electrical defects
• CPC Class Codes: Y10S 706/916 Electronic or computer, internal or network, circuit

Abstract

An abnormality diagnosing system and method for high voltage power apparatus wherein a plurality of detectors for detecting abnormalities of the high voltage power apparatus and providing outputs indicative thereof are disposed to detect predetermined phenomena indicative of at least an insulation abnormality, power supply abnormality, and foreign matter among abnormalities existing inside of the high voltage power apparatus. A monitoring arrangement responsive to the outputs of the detectors provides at least one of an output and display of the kind of abnormality detected.

Claims

1. An abnormality diagnosing system for a high-voltage power apparatus comprising:

means for detecting an oscillation signal from the high-voltage power apparatus of a frequency range of 200 Hz to 1500 MHz, said oscillation signal detecting means including at least two types of sensors selected from an acceleration sensor, acoustic emission sensor and radio frequency antenna sensor;

means for analyzing the frequency components of the detected oscillation signal from said oscillation signal detecting means and generating a frequency spectrum indicative of spectral intensity to frequency;

means for determining at least one type of an insulation abnormality, power supply abnormality and foreign matter among abnormalities existing inside of the high-voltage power apparatus on the basis of the frequency spectrum from said frequency analyzing means and for outputting at least one type of abnormality signal in accordance therewith.

2. An abnormality diagnosing system for a high-voltage power apparatus comprising:

means for detecting an oscillation signal from the high-voltage power apparatus, said oscillation signal detecting means includes an acceleration sensor for detecting frequency of a low frequency sound level and an acoustic sensor for detecting a high frequency sound level higher than that of the acceleration sensor;

means for analyzing the frequency components of the detected oscillation signal from said oscillation signal detecting means and generating a frequency spectrum indicative of spectral intensity to frequency; and

means for determining at least one type of abnormality of the high-voltage power apparatus on the basis of the frequency spectrum from said frequency analyzing means and for outputting at least one type of abnormality signal in accordance therewith.

3. An abnormality diagnosing system for a high-voltage power apparatus

means for detecting an oscillation signal from the high-voltage power apparatus, said oscillation signal detecting means including a first sensor for detecting a frequency below 400 MHz and a second sensor for detecting a frequency between 500 MHz to 1500 MHz;

means for analyzing the frequency components of the detected oscillation signal from said oscillation signal detecting means and generating a frequency spectrum indicative of spectral intensity to frequency; and

means for determining at least one type of abnormality of the high-voltage power apparatus on the basis of the frequency spectrum from said frequency analyzing means and for outputting at least one type of abnormality signal in accordance therewith.

4. An abnormality diagnosing system for a high-voltage power apparatus according to claim 3, wherein said first sensor is an acceleration sensor and said second sensor is an acoustic sensor.

5. An abnormality diagnosing system for a high-voltage power apparatus comprising:

means for detecting an oscillation signal from the high-voltage power apparatus, said oscillation signal detecting means including an acceleration sensor detecting a frequency of a low frequency sound level and an acoustic sensor for detecting a high frequency sound level higher than that of the acceleration sensor;

means for analyzing frequency components of the detected oscillation signal from said oscillation signal detecting means and generating a frequency spectrum indicative of spectral intensity to frequency; and

means for determining at least one type of abnormality of the high-voltage power apparatus on the basis of the frequency spectrum from said frequency analyzing means and outputting at least one type of abnormality signal in accordance therewith, said abnormality determining means further determining a type of abnormality on the basis of factors including a proportion of low frequency component to high frequency component of the detected sound.