公开(公告)号：US12301131B2

公开(公告)日：2025-05-13

申请号：US18163370

申请日：2023-02-02

Applicant: ABB Schweiz AG

Inventor： Ari Wahlroos ,  Janne Altonen ,  Janne Leminen

IPC: H02H9/08 ,  H02M1/12 ,  H02M7/487

Abstract: A method and apparatus for controlling a neutral point voltage of a three-phase resonant-earthed electric network, the apparatus including determining means configured to determine a target value for the neutral point voltage of the three-phase resonant-earthed electric network, calculating means configured to calculate at least one phase-specific control admittance or a neutral point specific control admittance required for controlling the neutral point voltage of the three-phase resonant-earthed electric network from a prevailing value to the determined target value, and admittance means configured to add the calculated at least one phase-specific control admittance between a ground and a respective phase of the three-phase resonant-earthed electric network or the calculated neutral point specific control admittance between the ground and a neutral point of the three-phase resonant-earthed electric network.

公开(公告)号：US20230318484A1

公开(公告)日：2023-10-05

申请号：US18163370

申请日：2023-02-02

Applicant: ABB Schweiz AG

Inventor： Ari Wahlroos ,  Janne Altonen ,  Janne Leminen

IPC: H02M7/487 ,  H02H9/08 ,  H02M1/12

CPC classification number: H02M7/487 ,  H02H9/08 ,  H02M1/12

Abstract: A method and apparatus for controlling a neutral point voltage of a three-phase resonant-earthed electric network, the apparatus including determining means configured to determine a target value for the neutral point voltage of the three-phase resonant-earthed electric network, calculating means configured to calculate at least one phase-specific control admittance or a neutral point specific control admittance required for controlling the neutral point voltage of the three-phase resonant-earthed electric network from a prevailing value to the determined target value, and admittance means configured to add the calculated at least one phase-specific control admittance between a ground and a respective phase of the three-phase resonant-earthed electric network or the calculated neutral point specific control admittance between the ground and a neutral point of the three-phase resonant-earthed electric network.

公开(公告)号：US11831146B2

公开(公告)日：2023-11-28

申请号：US16951377

申请日：2020-11-18

Applicant: ABB Schweiz AG

Inventor： Ari Wahlroos ,  Janne Altonen

IPC: G01R31/52 ,  H02H3/16 ,  H02H9/08

CPC classification number: H02H3/165 ,  G01R31/52 ,  H02H9/08

Abstract: A method and an apparatus for use in an earth-fault protection in a three-phase electric network, the apparatus configured to detect a phase-to-earth fault in the three-phase electric network, to determine for each of the three phases of the three-phase electric network a phase current during the detected phase-to-earth fault or a change in the phase current due to the detected phase-to-earth fault, to determine an estimate of an earth-fault current on the basis of the determined phase currents or on the basis of the determined changes in the phase currents, to determine, if the estimate of the earth-fault current represents an actual earth-fault current or an apparent earth-fault current, and to determine, in response to determining that the estimate of the earth-fault current represents the actual earth-fault current, that the estimate of the earth-fault current is valid.

公开(公告)号：US11522355B2

公开(公告)日：2022-12-06

申请号：US17084733

申请日：2020-10-30

Applicant: ABB Schweiz AG

Inventor： Ari Wahlroos ,  Janne Altonen

IPC: H02H3/16 ,  G01R31/52 ,  G01R31/08

Abstract: A method and an apparatus for use in an earth-fault protection in a three-phase electric network, the apparatus is configured to detect a phase-to-earth fault in the network, to determine for each of the phases of the network a phase current during the fault or a change in the phase current due to the fault, to detect a faulted phase of the network, to determine an estimate of an earth-fault current on the basis of the faulted phase and the phase currents or the changes in the phase currents, to determine a zero-sequence voltage of the electric network or a change in the zero-sequence voltage, and to determine a direction of the phase-to-earth fault from the measuring point on the basis of the estimate of the earth-fault current and the zero-sequence voltage or the change in the zero-sequence voltage.

公开(公告)号：US20210075210A1

公开(公告)日：2021-03-11

申请号：US17084733

申请日：2020-10-30

Applicant: ABB Schweiz AG

Inventor： Ari Wahlroos ,  Janne Altonen

IPC: H02H3/16 ,  G01R31/08 ,  G01R31/52

Abstract: A method and an apparatus for use in an earth-fault protection in a three-phase electric network, the apparatus is configured to detect a phase-to-earth fault in the network, to determine for each of the phases of the network a phase current during the fault or a change in the phase current due to the fault, to detect a faulted phase of the network, to determine an estimate of an earth-fault current on the basis of the faulted phase and the phase currents or the changes in the phase currents, to determine a zero-sequence voltage of the electric network or a change in the zero-sequence voltage, and to determine a direction of the phase-to-earth fault from the measuring point on the basis of the estimate of the earth-fault current and the zero-sequence voltage or the change in the zero-sequence voltage.

公开(公告)号：US20210075209A1

公开(公告)日：2021-03-11

申请号：US16951377

申请日：2020-11-18

Applicant: ABB Schweiz AG

Inventor： Ari Wahlroos ,  Janne Altonen

IPC: H02H3/16 ,  H02H9/08

Abstract: A method and an apparatus for use in an earth-fault protection in a three-phase electric network, the apparatus configured to detect a phase-to-earth fault in the three-phase electric network, to determine for each of the three phases of the three-phase electric network a phase current during the detected phase-to-earth fault or a change in the phase current due to the detected phase-to-earth fault, to determine an estimate of an earth-fault current on the basis of the determined phase currents or on the basis of the determined changes in the phase currents, to determine, if the estimate of the earth-fault current represents an actual earth-fault current or an apparent earth-fault current, and to determine, in response to determining that the estimate of the earth-fault current represents the actual earth-fault current, that the estimate of the earth-fault current is valid.