Abb Technology Ag

Abb Schweiz Ag

Abb Technology Ltd

Abb Power Grids Switzerland Ag

Sören Forsman

Ivo Brncic

Joseph Menezes

Zhanpeng Shi

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 I. 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 Ito be equal to the sum of the differential characteristic pick-up setting Iand the determined DC components, providing an adapted operate-restrain characteristics. Corresponding control device, computer program and computer program product are also disclosed.

Method and control device for current differential protection

A method for disconnecting a generator from a power system when the generator and the thereto connected power system are non-synchronized. The method includes the steps of: determining that there is a loss of synchronization between the generator and the power system, which loss of synchronization provides an amplitude variation of an electrical parameter associated with the generator. The method further includes determining when a minimum amplitude of the electrical parameter will occur, wherein when the occurrence of the minimum amplitude has been predicted, providing a command signal for disconnecting the generator from the power system, wherein the command signal is provided prior to the minimum amplitude of the electrical parameter is attained, and disconnecting the generator from the power system approximately when the determined minimum amplitude of the electrical parameter occurs. It is also presented a protection system for a generator in a power system.

Method and system for disconnecting a generator from a power system

A control device for controlling a circuit breaker. The control device includes a central processing unit and is arranged to communicate with an output module arranged to output operational commands to the circuit breaker. The output module includes processing means arranged to execute an operational command at a point of time received from the central processing unit. The invention also encompasses related methods.

Control device for controlling a circuit breaker, and methods

An Intelligent Electronic Device with integrated protection, and/or control, and/or monitoring for two power system primary objects or more power system primary objects, responsive to a plurality of inputs from the power system primary objects, and providing a plurality of outputs to the power system primary objects.

Growing community of inventors

Västerås, Sweden

Sören Forsman