Abstract:
Excitation control circuitry for a synchronous generator is disclosed. The synchronous generator is of a type comprising a main machine (2) and an exciter (6) for exciting the main machine. The excitation control circuitry comprises an automatic voltage regulator (10) for controlling power flow from the main machine to the exciter, and an excitation boost system (14) for selectively supplying power from a second source of electrical power (12) to the exciter (6). This can allow additional excitation to be provided, for example, when the generator is in overload. This arrangement can allow a synchronous generator to be upgraded by adding the excitation boost system to provide enhanced overload performance.
Abstract:
Excitation control circuitry for a synchronous generator is disclosed. The synchronous generator is of a type comprising a main machine (2) and an exciter (6) for exciting the main machine. The excitation control circuitry comprises an automatic voltage regulator (10) for controlling power flow from the main machine to the exciter, and an excitation boost system (14) for selectively supplying power from a second source of electrical power (12) to the exciter (6). This can allow additional excitation to be provided, for example, when the generator is in overload. This arrangement can allow a synchronous generator to be upgraded by adding the excitation boost system to provide enhanced overload performance.
Abstract:
A protection circuit (44) is disclosed for protecting an electrical generator in case of failure of a power control device in the excitation circuit. The electrical generator comprises a main machine (10), an exciter (18) for providing excitation to the main machine, and an automatic voltage regulator (26), the automatic voltage regulator comprising a power control device (32) for controlling excitation fed to the exciter and a control circuit (42) for controlling the power control device. The protection circuit (44) comprises means (46) for detecting an output of the control circuit, means (52) for detecting an output of the power control device, means (54) for comparing the output of the control circuit with the output of the power control device, and means (34) for reducing the excitation if the output of the power control device does not correspond to the output of the control circuit.
Abstract:
This invention provides a method for obtaining a recombinant antibody with a desired function, comprising: (a) providing a population of antibody- forming cells suspected of containing at least one cell capable of producing an antibody exhibiting the desired function; (b) generating one or more transcriptionally active recombinant linear polynucleotides from the antibody forming cells obtained in step (a) wherein each transcriptionally active recombinant linear polynucleotide comprises a polynucleotide sequence encoding a variable domain of an antibody produced by an antibody- forming cell obtained in step (a) and one or more transcription regulatory elements; (c) expressing a recombinant antibody using one or more of the transcriptionally active recombinant linear polynucleotides generated in step (b); (d) screening the recombinant antibody produced by step (c) for the desired function; and (e) optionally repeating steps (b), (c) and (d) to identify a recombinant antibody exhibiting the desired function.
Abstract:
A protection circuit (44) is disclosed for protecting an electrical generator in case of failure of a power control device in the excitation circuit. The electrical generator comprises a main machine (10), an exciter (18) for providing excitation to the main machine, and an automatic voltage regulator (26), the automatic voltage regulator comprising a power control device (32) for controlling excitation fed to the exciter and a control circuit (42) for controlling the power control device. The protection circuit (44) comprises means (46) for detecting an output of the control circuit, means (52) for detecting an output of the power control device, means (54) for comparing the output of the control circuit with the output of the power control device, and means (34) for reducing the excitation if the output of the power control device does not correspond to the output of the control circuit.