Patents by Inventor Juiping Pan

Juiping Pan has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 9042071
    Abstract: A breaker failure protection system for a high voltage direct current, HVDC, circuit breaker is provided. The circuit breaker is arranged for interrupting a DC circuit upon reception of a trip signal. The protection system includes a current sensor, at least one inductor, and a breaker failure detection unit. The current sensor is arranged for measuring a current I(t) through the DC circuit. The at least one inductor is connected in series with the DC circuit. The breaker failure detection unit is arranged for assessing, whether the circuit breaker has failed, and sending, if the circuit breaker has failed, a trip signal to an adjacent circuit breaker. The assessment is based on the measured current. The stability of HVDC grids may be improved by sending, in case of a breaker failure, a trip signal to adjacent circuit breakers. Further, a method of breaker failure protection for an HVDC circuit breaker is provided.
    Type: Grant
    Filed: September 13, 2010
    Date of Patent: May 26, 2015
    Assignee: ABB RESEARCH LTD
    Inventors: Bertil Berggren, Jianping Wang, Juiping Pan, Kerstin Linden, Reynaldo Nuqui
  • Patent number: 8749933
    Abstract: A protection system for high voltage direct current, HVDC, transmission lines is provided. The protection system includes a direct current, DC, bus, a device configured to connect an HVDC transmission line to the bus, at least one DC circuit breaker arranged for disconnecting the transmission line from the bus upon reception of a trip signal, current and voltage sensors, an inductor arranged such that the current through the transmission line passes the inductor, and a fault detection unit. The fault detection unit is arranged for assessing, on the basis of current and/or voltage measurements, whether a fault exists on the transmission line, and sending, if a fault is detected on the transmission line, a trip signal to the circuit breaker. The additional inductance limits the rise in fault current and facilitates a selective fault detection. Further, a method of fault protection for an HVDC transmission line is provided.
    Type: Grant
    Filed: September 13, 2010
    Date of Patent: June 10, 2014
    Assignee: ABB Research Ltd
    Inventors: Bertil Berggren, Jianping Wang, Juiping Pan, Kailash Srivastava, Kerstin Linden, Reynaldo Nuqui
  • Publication number: 20130088802
    Abstract: A protection system for high voltage direct current, HVDC, transmission lines is provided. The protection system includes a direct current, DC, bus, a device configured to connect an HVDC transmission line to the bus, at least one DC circuit breaker arranged for disconnecting the transmission line from the bus upon reception of a trip signal, current and voltage sensors, an inductor arranged such that the current through the transmission line passes the inductor, and a fault detection unit. The fault detection unit is arranged for assessing, on the basis of current and/or voltage measurements, whether a fault exists on the transmission line, and sending, if a fault is detected on the transmission line, a trip signal to the circuit breaker. The additional inductance limits the rise in fault current and facilitates a selective fault detection. Further, a method of fault protection for an HVDC transmission line is provided.
    Type: Application
    Filed: September 13, 2010
    Publication date: April 11, 2013
    Applicant: ABB RESEARCH LTD
    Inventors: Bertil Berggren, Jianping Wang, Juiping Pan, Kailash Srivastava, Kerstin Linden, Reynaldo Nuqui
  • Publication number: 20130077204
    Abstract: A breaker failure protection system for a high voltage direct current, HVDC, circuit breaker is provided. The circuit breaker is arranged for interrupting a DC circuit upon reception of a trip signal. The protection system includes a current sensor, at least one inductor, and a breaker failure detection unit. The current sensor is arranged for measuring a current I(t) through the DC circuit. The at least one inductor is connected in series with the DC circuit. The breaker failure detection unit is arranged for assessing, whether the circuit breaker has failed, and sending, if the circuit breaker has failed, a trip signal to an adjacent circuit breaker. The assessment is based on the measured current. The stability of HVDC grids may be improved by sending, in case of a breaker failure, a trip signal to adjacent circuit breakers. Further, a method of breaker failure protection for an HVDC circuit breaker is provided.
    Type: Application
    Filed: September 13, 2010
    Publication date: March 28, 2013
    Applicant: ABB RESEARCH LTD
    Inventors: Bertil Berggren, Jianping Wang, Juiping Pan, Kerstin Linden, Reynaldo Nuqui
  • Publication number: 20120181862
    Abstract: An apparatus for use in an electrical power generation plant. The apparatus includes: at least two adjustable speed drives, each connected, on an alternating current side, to an associated auxiliary motor; at least one reactive power consuming auxiliary device connected to an alternating current bus; a controller; a converter for converting alternating current to direct current or vice versa between the alternating current bus and a direct current bus; and at least one electrical power source arranged to provide power to the direct current bus. Each of the at least two adjustable speed drive is connected, on a direct current side, to the direct current bus.
    Type: Application
    Filed: December 1, 2011
    Publication date: July 19, 2012
    Inventors: Lars Gertmar, Dennis Kron, Juiping Pan, Yao Chen, Richard W. Vesel, Arash A. Babaee