Title:
電力系統保護用の連続無停止ＡＣ接地システム
Document Type and Number:
Japanese Patent JP6560731
Kind Code:
B2
Abstract:
A continuous grounding system for use in an alternating current system including a transformer is disclosed. The system includes a switch assembly connected between a transformer neutral of a transformer and a ground, the switch assembly having an open position and a closed position, the open position disrupting the path through the switch assembly between the electrical connection and the transformer neutral, and the closed position establishing a path connecting the electrical connection to the transformer neutral through the switch assembly, wherein in normal operation of the alternating current electrical device the switch assembly remains in a closed position. The system also includes a DC blocking component positioned in parallel with the switch assembly and connected between the transformer neutral and the ground. The system further includes a control circuit configured to control the switch assembly, the control circuit including a sensor configured to actuate the switch assembly to an open position upon detection of a predetermined harmonic signal threshold at one of the transformer phases or a predetermined threshold of DC current between the transformer neutral and ground.
Inventors:
Faxvog, Frederick, Earl.
Jensen, Wallace
Nordling, Gale
Fuchs, Greg
Jackson, david, break
Volkman, Terry, Lee
Rule, James, Nicholas
Gro-, Bryan
Jensen, Wallace
Nordling, Gale
Fuchs, Greg
Jackson, david, break
Volkman, Terry, Lee
Rule, James, Nicholas
Gro-, Bryan
Application Number:
JP2017226037A
Publication Date:
August 14, 2019
Filing Date:
November 24, 2017
Export Citation:
Assignee:
Emplymouth, LLC
International Classes:
H02H1/04; H02H9/00; H02M7/04
Domestic Patent References:
| JP3207224A | ||||
| JP2002186170A | ||||
| JP5081973A | ||||
| JP6260308A | ||||
| JP2007330071A | ||||
| JP2010246366A | ||||
| JP7322487A | ||||
| JP58103823A | ||||
| JP57028525A | ||||
| JP58046804A | ||||
| JP54084527A |
Foreign References:
| US1865409 | ||||
| US20070105445 | ||||
| US7589943 | ||||
| US5930099 | ||||
| US20040196675 | ||||
| US20100250497 | ||||
| US5751530 |
Other References:
長谷良秀,第8章中性点接地方式/第20章過電圧現象,電力系統技術の実用理論ハンドブック,日本,丸善株式会社,2004年 3月30日,初版,117-122,317,321-323頁
Leonard Bolduc 他,Development of a DC Current-Blocking Device for Transformer Neutrals,IEEE TRANSACTIONS ON POWER DELIVERY,米国,IEEE,2005年 1月31日,Vol. 20, NO. 1,pp.163-168
Leonard Bolduc 他,Development of a DC Current-Blocking Device for Transformer Neutrals,IEEE TRANSACTIONS ON POWER DELIVERY,米国,IEEE,2005年 1月31日,Vol. 20, NO. 1,pp.163-168
Attorney, Agent or Firm:
Isono International Patent and Trademark Office