Le Yi Tang

US Patent:

6671634, Dec 30, 2003

Filed:

Jul 27, 2001

Appl. No.:

09/916811

Inventors:

Krassimir G. Koutlev - Cary NC
Richard E. Brown - Cary NC
Le Tang - Cary NC
Antonio C. Carvalho - Untersiggenthal, CH
Marta Lacorte - Untersiggenthal, CH
Hans-Erik Olovsson - Västerås, SE
Giuliano Guerra - Novi Ligure, IT
Andre Osterholt - Einhausen, DE
Carl-Ejnar Sölver - Ludvika, SE

Assignee:

ABB Research Ltd. - Zurich

International Classification:

G01R 2100

US Classification:

702 60, 702 58, 324537

Abstract:

Reliability assessment of a power system having an integrated component is provided by retrieving individual component failure rates associated with individual components of the integrated component. A failure time is modeled based on the individual component failure rates associated with individual components of the integrated component. Individual component maintenance times are retrieved associated with individual components of the integrated component. A maintenance time is modeled based on the individual component maintenance times associated with individual components of the integrated component. A reliability assessment is determined based on the interconnectivity of components of the power system, the modeled maintenance times, and the modeled failure times.

US Patent:

6988092, Jan 17, 2006

Filed:

Dec 21, 2001

Appl. No.:

10/037397

Inventors:

Le Tang - Cary NC, US
Xiaoming Feng - Apex NC, US
David Lubkeman - Raleigh NC, US
Anil Pahwa - Manhattan KS, US
Jiuping Pan - Raleigh NC, US
Lan Trinh - Cary NC, US
Zhenyuan Wang - Apex NC, US

Assignee:

ABB Research Ltd. - Zurich

International Classification:

G06F 17/30

US Classification:

707 1, 705 10, 705 11

Abstract:

A computer implemented method uses a database of detailed, comprehensive utility operating and financial information. The method comprises: () feature based matching or similarity based benchmark and focus group selection; () a performance assessment procedure comprising multi-perspective analysis; and () multi-attribute business profiling and performance improvement potential analysis. As part of the performance assessment step, data corresponding to different utilities in a selected benchmark group are compared with each other to find their strengths and weaknesses. Interpretation of these gaps provides the cause of such gaps. Composite ranking analysis is used so that a composite score of at least one utility business is obtained.

US Patent:

7203622, Apr 10, 2007

Filed:

Dec 23, 2003

Appl. No.:

10/744743

Inventors:

Jiuping Pan - Raleigh NC, US
Reynaldo Nuqui - Cary NC, US
Le Tang - Cary NC, US

Assignee:

ABB Research Ltd. - Zurich

International Classification:

G06F 11/30
G06F 15/00

US Classification:

702184

Abstract:

A systematic approach is presented for the development and implementation of cost-effective transmission asset maintenance strategies. The overall concept and methodology are based on transmission reliability and risk management and address the value of preventive maintenance activities. This may help electric network utilities conduct maintenance policy assessment, region-wide criticality analysis, and optimal maintenance resource allocation and task scheduling.

US Patent:

7948352, May 24, 2011

Filed:

Oct 7, 2008

Appl. No.:

12/246974

Inventors:

Le Tang - Cary NC, US
Mohamed Y. Haj-Maharsi - Garner NC, US
Ernst Scholtz - Raleigh NC, US

Assignee:

ABB Research Ltd. - Zurich

International Classification:

H01H 71/20
H01H 71/10
H02B 1/26
G08B 21/00

US Classification:

337171, 337168, 361622, 361626, 340687

Abstract:

A wireless secondary assembly is disclosed for use in an electrical distribution network. The secondary assembly may include a wireless source electrically connected to a first electric cable and adapted to emit an electromagnetic power signal. A wireless receiver is electrically connected to a secondary device and adapted to receive the electromagnetic power signal and convert the electromagnetic power signal to electricity to power to secondary device.

US Patent:

20040153303, Aug 5, 2004

Filed:

Dec 23, 2003

Appl. No.:

10/744386

Inventors:

Le Tang - Cary NC, US
Xiaoming Feng - Apex NC, US

International Classification:

G06F017/50

US Classification:

703/018000

Abstract:

A method and system for efficiently simulating an electric power transmission network is disclosed. In the method, a parameterized value is assigned to an element in the network that is present during any time interval of a simulation test period. If an element in the network has changed from a preceding time interval, the network of the preceding time interval is updated by changing the parameterized value for the changed element, and the updated network is simulated. If any element in the network has not changed from the network of the preceding time interval, the network is simulated based on the network of the preceding time interval.

US Patent:

20090299542, Dec 3, 2009

Filed:

May 27, 2009

Appl. No.:

12/472532

Inventors:

Reynaldo Nuqui - Cary NC, US
Le Tang - Cary NC, US

Assignee:

ABB RESEARCH LTD. - Zurich

International Classification:

G05B 9/02
G06F 1/26

US Classification:

700297, 700 21

Abstract:

A method is disclosed for preventing malicious settings changes to IEDs in a power transmission and distribution network. Attempted changes to the protection settings of an IED is detected and transmitted to one or more neighboring IEDs. The neighboring IEDs check for consistency of the new settings and return conformance or nonconformance signals. If a nonconformance signal is received, the attempted setting change is not allowed.

US Patent:

20100201338, Aug 12, 2010

Filed:

Feb 5, 2010

Appl. No.:

12/701235

Inventors:

Mohamed Y. Haj-Maharsi - Houston TX, US
Le Tang - Cary NC, US
Rafael Gutierrez - Wytheville VA, US
Sandeep Bala - Raleigh NC, US

Assignee:

ABB RESEARCH LTD. - Zurich

International Classification:

G05F 3/04

US Classification:

323305, 336192

Abstract:

A hybrid transformer is provided that includes an electromagnetic transformer and an AC-AC converter with a DC bridge. The AC-AC converter is operable to keep the input voltage and current of the hybrid transformer substantially in phase and to reduce fluctuation in the output voltage of the hybrid transformer in the event of an increase or decrease in the input voltage.

US Patent:

20100220499, Sep 2, 2010

Filed:

Feb 26, 2010

Appl. No.:

12/713766

Inventors:

Mohamed Y. Haj-Maharsi - Houston TX, US
Sandeep Bala - Raleigh NC, US
Le Tang - Cary NC, US

Assignee:

ABB RESEARCH LTD. - Zurich

International Classification:

H02M 7/00

US Classification:

363 13

Abstract:

A hybrid distribution transformer is provided that includes an electromagnetic transformer and a voltage source converter that is operable to reduce fluctuation in the output voltage of the hybrid distribution transformer in the event of an increase or decrease in the input voltage.