Power equipment

• US 20080061997A1
• Filed: 09/04/2007
• Published: 03/13/2008
• Est. Priority Date: 09/07/2006
• Status: Active Grant

• Current Assignee: Mitsubishi Electric Corporation
• Original Assignee: Mitsubishi Electric Corporation
• Inventors: Aono, Kazuaki, Miyashita, Makoto
• Granted Patent: US 7,872,586 B2
• Time in Patent Office: Days
• US Class Current: 340/646
• CPC Class Codes: H02H 1/0015 Using arc detectors
• CPC Class Codes: H02H 7/04 for transformers

Abstract

A power equipment includes a first internal abnormality detection apparatus comprising a first antenna accommodation pipe which is connected to a first connection pipe formed in a enclosed container and which accommodates a first antenna therein, and a first signal detection circuit which is connected to a first antenna and which detects an electromagnetic wave signal emitted when any abnormality has occurred within the enclosed container.

Claims

1. A power equipment wherein a high voltage conductor disposed within an enclosed container is supported by an insulator, comprising:

a first internal abnormality detection apparatus including a first antenna accommodation pipe which is connected to a first connection pipe formed in the enclosed container and which accommodates a first antenna therein, and a first signal detection circuit which is connected to the first antenna and which detects an electromagnetic wave signal emitted when any abnormality has occurred within the enclosed container.

2. A power equipment as defined in claim 1, wherein a first shield for intercepting external noise is arranged in the first antenna accommodation pipe.

3. A power equipment as defined in claim 2, wherein the first shield is disposed so as to conceal a terminal end part of the first antenna accommodation pipe.

4. A power equipment as defined in claim 1, wherein a pressure release plate made of an insulator is disposed in the first connection pipe in order to externally release an internal pressure which rises with the occurrence of the abnormality within the enclosed container.

5. A power equipment as defined in claim 1, wherein the first signal detection circuit includes;

a first filter which is tuned to a resonance frequency band of the first antenna accommodation pipe,

a first comparator which compares a level of the electromagnetic wave signal with a first threshold value, and

a first alarm display unit which presents an alarm display in a case where the first comparator has judged that the signal level of the electromagnetic wave signal through the first filter has exceeded the first threshold value.

6. A power equipment as defined in claim 5, the first signal detection circuit thereof further including;

a first AC-divided-voltage-waveform generation circuit which outputs a first AC-divided-voltage waveform,

a first decision unit to which a signal of the first comparator and the first AC-divided-voltage waveform are inputted in the case where the first comparator has judged that the signal level of the electromagnetic wave signal through the first filter has exceeded the first threshold value, and which detects synchronism between the electromagnetic wave signal and the first AC-divided-voltage wave form so as to judge the abnormality as a partial discharge when the synchronism has been detected, and wherein the alarm display is presented by the first alarm display unit when the synchronism has been detected.

7. A power equipment as defined in claim 1, wherein the first connection pipe is formed on an outer surface of the enclosed container.

8. A power equipment as defined in claim 1, wherein the first connection pipe and the first antenna accommodation pipe are configured of a single pipe.

9. A power equipment as defined in claim 1, wherein the power equipment further includes:

a second connection pipe formed on the enclosed container,

a partition plate made of an insulator, which transmits the electromagnetic wave signal and which partitions the open air and the interior of the enclosed container, the partition plate being disposed within the second connection pipe; and

a second internal abnormality detection apparatus including a second antenna accommodation pipe which is connected to the second connection pipe and which accommodates a second antenna therein, and a second signal detection circuit which is connected to the second antenna and which detects the electromagnetic wave signal.

10. A power equipment as defined in claim 9, wherein a second shield for intercepting external noise is arranged in the second antenna accommodation pipe.

11. A power equipment as defined in claim 10, wherein the second shield is disposed so as to conceal a terminal end part of the second antenna accommodation pipe.

12. A power equipment as defined in claim 9, wherein the second signal detection circuit includes;

a second filter which is tuned to a resonance frequency band of the second antenna accommodation pipe,

a second comparator which compares a level of the electromagnetic wave signal with a second threshold value, and

a second alarm display unit which presents an alarm display in a case where the second comparator has judged that the signal level of the electromagnetic wave signal through the second filter has exceeded the second threshold value.

13. A power equipment as defined in claim 12, the second signal detection circuit thereof further including;

a second AC-divided-voltage-waveform generation circuit which outputs a second AC-divided-voltage waveform,

a second decision unit to which a signal of the second comparator and the second AC-divided-voltage waveform are inputted in the case where the second comparator has judged that the signal level of the electromagnetic wave signal through the second filter has exceeded the second threshold value, and which detects synchronism between the electromagnetic wave signal and the second AC-divided-voltage waveform so as to judge the abnormality as a partial discharge when the synchronism has been detected, and wherein the alarm display is presented by the second alarm display unit when the synchronism has been detected.

14. A power equipment as defined in claim 9, wherein the first antenna accommodation pipe connected to the first connection pipe and the second antenna accommodation pipe connected to the second connection pipe are arranged at a predetermined distance.

15. A power equipment as defined in claim 9, wherein the second connection pipe is formed on an outer surface of the enclosed container.

16. A power equipment as defined in claim 9,

wherein the second connection pipe and the second antenna accommodation pipe are configured of a single pipe, and a partition plate made of an insulator, transmitting the electromagnetic wave signal and partitioning the open air and the interior of the enclosed container, is disposed within the second antenna accommodation pipe and on a side of the enclosed container with respect to the second antenna.

17. A power equipment as defined in claim 9, wherein a plurality of such second internal abnormality detection apparatuses are disposed, and the first and second internal abnormality detection apparatuses are arranged at predetermined distances from one another.

18. A power equipment having a first connection pipe, and a pressure release plate made of an insulator, which is disposed within the first connection pipe in order to externally release a pressure that rises with occurrence of any abnormality within an enclosed container, wherein a high voltage conductor disposed within the enclosed container is supported by an insulator, comprising:

an antenna accommodation pipe in which an antenna is arranged,

a second connection pipe which connects the antenna accommodation pipe and the enclosed container,

a second signal detection device which is connected to the antenna and which detects a signal emitted when the abnormality has occurred within the enclosed container, and

a partition plate made of an insulator, which transmits the signal at the occurrence of the abnormality within the enclosed container and which is disposed within the second connection pipe in order to partition the open air and the interior of the enclosed container.

19. A power equipment as defined in claim 18, wherein the antenna accommodation pipe and the second connection pipe are configured of a single pipe.