Invention Publication
- Patent Title: METHOD AND ARRANGEMENT FOR CAPACITOR BANK PROTECTION
- Patent Title (中): 方法和系统电容器组的保护
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Application No.: EP11729385.2Application Date: 2011-05-26
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Publication No.: EP2596564A1Publication Date: 2013-05-29
- Inventor: GAJIC, Zoran
- Applicant: ABB Technology AG
- Applicant Address: Affoltern Strasse 44 8050 Zürich CH
- Assignee: ABB Technology AG
- Current Assignee: ABB Technology AG
- Current Assignee Address: Affoltern Strasse 44 8050 Zürich CH
- Agency: Ahrengart, Kenneth
- Priority: US367052P 20100723
- International Announcement: WO2012010353 20120126
- Main IPC: H02H7/16
- IPC: H02H7/16 ; H02J3/18
Abstract:
The present invention relates to a method for protecting against a failure within a multi-phase capacitor bank (1 ) comprising a plurality of capacitor units (30, U1
1 ,...,U1
i , U1
i+1 , U2
1 ,...,U2
i , U2
i+1 , U3
1 ,...,U3
i , U3
i+1 ) each comprising a plurality of capacitor elements (40) connected to each other, wherein capacitor units are connected to each other and the failure may involve two neighboring capacitor units. The method comprises steps of measuring the current of each individual phase of the capacitor bank (100), calculating the magnitude of an unbalanced current (I
unbalanced ) based on the measured currents (110), measuring the voltage of each individual phase of the capacitor bank (120), calculating the magnitude of an unbalanced voltage (U
unbalanced ) based on the measured voltages (130), determining an operating point (U
unbalanced , I
unbalanced ) based on the calculated the magnitudes of the unbalanced current and the unbalanced voltage (140), examining where the defined operating point (U
unbalanced , I
unbalanced ) is located in a specified operating region (150), and initializing a trip signal based on the location of the defined operating point (U
unbalanced , I
unbalanced ) in the specified operating region (190, 190').
1 ,...,U1
i , U1
i+1 , U2
1 ,...,U2
i , U2
i+1 , U3
1 ,...,U3
i , U3
i+1 ) each comprising a plurality of capacitor elements (40) connected to each other, wherein capacitor units are connected to each other and the failure may involve two neighboring capacitor units. The method comprises steps of measuring the current of each individual phase of the capacitor bank (100), calculating the magnitude of an unbalanced current (I
unbalanced ) based on the measured currents (110), measuring the voltage of each individual phase of the capacitor bank (120), calculating the magnitude of an unbalanced voltage (U
unbalanced ) based on the measured voltages (130), determining an operating point (U
unbalanced , I
unbalanced ) based on the calculated the magnitudes of the unbalanced current and the unbalanced voltage (140), examining where the defined operating point (U
unbalanced , I
unbalanced ) is located in a specified operating region (150), and initializing a trip signal based on the location of the defined operating point (U
unbalanced , I
unbalanced ) in the specified operating region (190, 190').
Public/Granted literature
- EP2596564B1 METHOD AND ARRANGEMENT FOR CAPACITOR BANK PROTECTION Public/Granted day:2014-03-19
Information query
