公开(公告)号：US20170222429A1

公开(公告)日：2017-08-03

申请号：US15489203

申请日：2017-04-17

Applicant: ABB Schweiz AG

Inventor： Robert TURNER

IPC: H02H9/00 ,  H02H9/04 ,  H02M7/48 ,  H02M5/22 ,  H02M1/42 ,  H02M7/12

CPC classification number: H02H9/002 ,  H02H7/0455 ,  H02H9/045 ,  H02M1/36 ,  H02M1/40 ,  H02M1/42 ,  H02M5/12 ,  H02M5/22 ,  H02M7/12 ,  H02M7/48 ,  H02M2007/4835

Abstract: The present invention is concerned with pre-magnetizing a Modular Multilevel power Converters connected transformer in order to moderate inrush currents upon connecting the transformer to an electric grid. The invention takes advantage of the high amount of stored energy in MMC converters as compared to other converter types. This stored energy is used to pre-magnetize the converter-connected transformer, therefore no additional or dedicated pre-magnetizing hardware is required in addition to the charging hardware provided to charge the converter capacitors. As the transformer pre-magnetizing takes place subsequent to the converter charging, the converter charging circuit is not used to, and therefore does not need to be designed to, directly magnetize the transformer.

公开(公告)号：US20120019962A1

公开(公告)日：2012-01-26

申请号：US13185858

申请日：2011-07-19

Applicant: Frederick R. Faxvog ,  Wallace Jensen ,  Terrance R. Noe ,  Craig Eid ,  David Blake Jackson ,  Greg Fuchs ,  Gale Nordling

Inventor： Frederick R. Faxvog ,  Wallace Jensen ,  Terrance R. Noe ,  Craig Eid ,  David Blake Jackson ,  Greg Fuchs ,  Gale Nordling

IPC: H02H1/00 ,  H03K5/00

CPC classification number: H02H5/005 ,  H02H3/52 ,  H02H7/0455

Abstract: Systems and method for detecting potentially harmful harmonic and direct current signals at a transformer are disclosed. One such system includes a plurality of detection components electrically connected to electrical signal lines leading from one or more connection points on a power grid, and a plurality of threshold detectors, each threshold detector configured to compare an incoming signal from a detection component to a predetermined signal having a threshold. The system also includes a controller receiving an output from each of the plurality of threshold detectors and configured to drive at least one external component in response to receiving an indication from at least one of the plurality of threshold detectors of a detected signal above a threshold.

Abstract translation: 公开了一种在变压器上检测潜在的有害谐波和直流电信号的系统和方法。 一种这样的系统包括电连接到从电网上的一个或多个连接点引出的电信号线的多个检测组件和多个阈值检测器，每个阈值检测器被配置为将来自检测部件的输入信号与预定的 信号具有阈值。 所述系统还包括控制器，其接收来自所述多个阈值检测器中的每一个的输出，并且被配置为响应于从所述多个阈值检测器中的至少一个检测器接收到高于阈值的检测信号的指示来驱动至少一个外部部件。

公开(公告)号：US20100208403A1

公开(公告)日：2010-08-19

申请号：US11991124

申请日：2006-08-29

Applicant: Ratan Das ,  Sethuraman Ganesan ,  John M. Peterson

Inventor： Ratan Das ,  Sethuraman Ganesan ,  John M. Peterson

IPC: H02H3/00

CPC classification number: H02H7/0455 ,  G01R19/2513 ,  G01R27/2694 ,  G01R31/027 ,  G01R31/34 ,  H02H3/006

Abstract: The present invention is directed to a method and a system for fault detection analysis in a power device which is operatively associated with a differential protection unit. The power device has one input side and one output side through which an input current and an output current flows into and out from it, respectively. Signals representative of the input and output currents are processed in order to verify if an occurring fault is external to the power device. Under a condition of an external fault, the differential protection unit is disabled for a determined interval of time.

Abstract translation: 本发明涉及一种与差分保护单元可操作地相关联的功率器件中的故障检测分析的方法和系统。 功率器件具有一个输入侧和一个输出侧，输入电流和输出电流分别通过该输入侧和输出侧流入和流出。 处理代表输入和输出电流的信号，以验证发生故障是否在功率器件外部。 在外部故障的情况下，差动保护单元在一段确定的时间间隔内被禁用。

公开(公告)号：US11777417B2

公开(公告)日：2023-10-03

申请号：US18099238

申请日：2023-01-19

Applicant: Delta Electronics, Inc.

Inventor： Misha Kumar ,  Yungtaek Jang

IPC: H02M3/335 ,  H02M1/32 ,  H02M1/40 ,  H02M1/00 ,  H02H7/045

CPC classification number: H02M3/33592 ,  H02M1/32 ,  H02M1/40 ,  H02M3/3353 ,  H02M3/33584 ,  H02H7/0455 ,  H02M1/0003 ,  H02M1/0041

Abstract: A power converter and a control method thereof are provided. The power converter includes a primary side switching circuit, a secondary side switching circuit, a transformer, and a control circuit. The primary side switching circuit includes a first set of switches. The secondary side switching circuit includes a second set of switches. The transformer is coupled between the primary side switching circuit and the secondary side switching circuit. The control circuit is configured to control power transfer between the primary side switching circuit and the secondary side switching circuit by controlling the first and second sets of switches. The control circuit is adapted to enable and disable the first and second sets of switches in an enabling duration and a disabling duration respectively and alternatively.

公开(公告)号：US20180358802A1

公开(公告)日：2018-12-13

申请号：US15780524

申请日：2016-01-27

Applicant: ABB Schweiz AG

Inventor： Ivo Brncic ,  Zhanpeng Shi ,  Sören Forsman

IPC: H02H7/045 ,  H02H1/00

CPC classification number: H02H7/0455 ,  H02H1/0092 ,  H02H3/006 ,  H02H3/283 ,  H02H7/045

Abstract: A method of current differential protection performed in a control device is disclosed, wherein the control device has a first operate-restrain characteristic with a differential characteristic pick-up setting ID. The method includes: determining currents of all terminals of a protected object; determining a differential current based on the determined currents; determining direct current, DC, components in the respective determined currents; detecting a fault; and adjusting, for a detected external fault, the operate-restrain characteristics by setting an adjusted differential characteristic pick-up setting ID_adj to be equal to the sum of the differential characteristic pick-up setting ID and the determined DC components, providing an adapted operate-restrain characteristics. Corresponding control device, computer program and computer program product are also disclosed.

公开(公告)号：US09018962B2

公开(公告)日：2015-04-28

申请号：US13736927

申请日：2013-01-08

Applicant: Gary R. Hoffman ,  Edward S. Kwon ,  Hong Cai

Inventor： Gary R. Hoffman ,  Edward S. Kwon ,  Hong Cai

IPC: G01R31/06 ,  G01R31/02 ,  G01R31/12 ,  H02H7/04 ,  H02H3/093 ,  H02H3/52

CPC classification number: G01R31/027 ,  G01R31/1227 ,  H02H3/093 ,  H02H3/52 ,  H02H5/005 ,  H02H7/04 ,  H02H7/0455

Abstract: A protective system far a power transformer having a neutral line connected to ground where large currents can flow in the neutral line due to electro-magnetic disturbances. The system includes circuitry for: (a) sensing the current level in the neutral line and whether it exceeds a predetermined threshold for a predetermined period; and (b) sensing and processing the harmonic content of the load current and determining the existence of certain relationships of the “even” and “odd” harmonics. Signals, including alarms, indicative of excessive conditions are produced. The system may also include circuitry for sensing the load current level and generating a signal alarm if the load level is above a given value when the harmonics and the DC current have values in excess of certain predetermined values.

Abstract translation: 远离电力变压器的保护系统，其中性线连接到地面，由于电磁干扰，大电流可能在中性线中流动。 该系统包括用于以下步骤的电路：（a）感测中性线中的电流电平以及它是否在预定时间段内超过预定阈值; 和（b）感测和处理负载电流的谐波含量并确定“偶数”和“奇数”谐波的某些关系的存在。 产生指示过度状况的信号，包括报警。 如果谐波和DC电流的值超过某些预定值，则系统还可以包括用于感测负载电流电平和产生信号报警的电路，如果负载电平高于给定值。

公开(公告)号：US20130208386A1

公开(公告)日：2013-08-15

申请号：US13760704

申请日：2013-02-06

Applicant: Kodensya Co., Ltd.

Inventor： Toshiyasu Kai ,  Yoshihide Hase

IPC: H02H7/04

CPC classification number: H02H7/04 ,  H01H9/563 ,  H02H7/0455 ,  H02H9/002

Abstract: There is provided with a transformer inrush current restraining control equipment that provide useful practice to effectively restrain transformer inrush current which would be inevitably caused whenever a transformer under out of service is going to be put into operation by the related breaker closing operation. The transformer inrush current restraining control equipment 10 includes a voltage measuring unit 1; a true residual fluxes timing calculating unit 2; a core-flux calculating unit 3; a true residual flux calculating unit 4; a breaker closing phase angular timing calculating unit 5; a breaker closing phase angular timing controlling unit 6.

Abstract translation: 提供了一种变压器浪涌电流抑制控制设备，其提供了有效地抑制变压器浪涌电流的有用实践，这在每次通过相关的断路器闭合操作投入运行的变压器将不可避免地导致。 变压器浪涌电流抑制控制装置10包括电压测量单元1; 真实剩余通量定时计算单元2; 核心流量计算单元3; 真实剩余通量计算单元4; 断路器闭合相位角定时计算单元5; 断路器闭合相位角定时控制单元6。

公开(公告)号：US07738221B2

公开(公告)日：2010-06-15

申请号：US11999813

申请日：2007-12-07

Applicant: Ljubomir A. Kojovic ,  Martin T. Bishop ,  Timothy R. Day

Inventor： Ljubomir A. Kojovic ,  Martin T. Bishop ,  Timothy R. Day

IPC: H02H7/04

CPC classification number: H02H7/0455 ,  H02H1/043 ,  H02H3/44

Abstract: A differential protection system for power transformers using Rogowski coils as current sensors can support an inrush current detection method based on sensing lows in the derivative of the sensed current. Effective detection of power transformer inrush conditions can enable blocking of a protection relay during inrush where the differential current may exceed a differential threshold value indicative of a fault without the presence of an actual fault. The outputs of the Rogowski coils, being proportional to the first time derivative of the sensed current, may be useful in the inrush detection method. Also, with reduced saturation concerns, the Rogowski coil protection system may employ a single slope response with increased sensitivity. A discrete time sampling technique for identifying low di/dt portions within the sensed current also may be useful in detecting power transformer inrush conditions.

Abstract translation: 使用Rogowski线圈作为电流传感器的电力变压器的差动保护系统可以支持基于感测电流的导数感测低电平的浪涌电流检测方法。 电力变压器浪涌条件的有效检测可以在涌流期间阻止保护继电器，其中差分电流可能超过指示故障的差分阈值而不存在实际故障。 与所感测的电流的第一次导数成比例的Rogowski线圈的输出在涌入检测方法中可能是有用的。 而且，随着饱和问题的减少，Rogowski线圈保护系统可以采用灵敏度增加的单斜率响应。 用于识别感测电流内的低di / dt部分的离散时间采样技术也可用于检测电力变压器涌入条件。

公开(公告)号：US06940702B2

公开(公告)日：2005-09-06

申请号：US10394579

申请日：2003-03-24

Applicant: Ljubomir A. Kojovic ,  Veselin Skendzic ,  Timothy Robert Day

Inventor： Ljubomir A. Kojovic ,  Veselin Skendzic ,  Timothy Robert Day

IPC: H02H1/00 ,  H02H3/10 ,  H02H3/28 ,  H02H7/045 ,  H02H7/00

CPC classification number: H02H3/28 ,  H02H1/0007 ,  H02H3/10 ,  H02H7/0455

Abstract: Protection systems for electrical systems such as substation power dividers are described. The protection systems may be designed and used to detect and clear faults that may occur within the substation power dividers. For example, a first Rogowski coil may be used to detect current along a primary conductor, and output a corresponding current signal to a multi-function, differential relay having multiple voltage and current inputs. Similarly, additional Rogowski coils may be used at each of a plurality of secondary feeders, where power from the primary feeder may be distributed to the secondary feeders using a connection bus. By comparing the signals from the first Rogowski coil and the additional Rogowski coils, the differential relay may determine whether a fault exists at some point along the conductor(s) and between the first Rogowski coils and the additional Rogowski coils, including whether a fault is associated with the connection bus. Further, the relay may then, in response to the fault, trip a circuit breaker or other network protection device, so that the fault may be corrected.

Abstract translation: 描述了诸如变电站功率分配器之类的电气系统的保护系统。 保护系统可以被设计和用于检测和清除在变电站功率分配器内可能发生的故障。 例如，可以使用第一罗戈夫斯基线圈来检测沿着主导体的电流，并且将相应的电流信号输出到具有多个电压和电流输入的多功能差分继电器。 类似地，可以在多个次级馈电器中的每一个上使用额外的罗戈夫斯基线圈，其中来自主馈线的电力可以使用连接总线分配到次馈电线。 通过比较来自第一罗戈夫斯基线圈和附加罗戈夫斯基线圈的信号，差分继电器可以确定沿着导体的某一点以及在第一罗戈夫斯基线圈和附加的罗戈夫斯基线圈之间是否存在故障，包括故障是否是 与连接总线相关联。 此外，继电器可以响应于故障而跳闸断路器或其他网络保护装置，从而可以纠正故障。

公开(公告)号：US2246816A

公开(公告)日：1941-06-24

申请号：US32659640

申请日：1940-03-29

Applicant: SANDSTROM PER N

Inventor： SANDSTROM PER N

IPC: H02H7/045

CPC classification number: H02H7/045 ,  H02H7/0455