Abstract: This invention describes a means of statically controlling the negative and zero sequence couplings of an overhead line with unequal spacing between phases and describes a means of controlling either the negative sequence coupling or the zero sequence coupling, which may be advantageous for some power system applications. In particular, this invention describes a means of reducing either the negative sequence coupling or the zero sequence coupling to a value approaching zero, thereby reducing the negative sequence or zero sequence induced voltage resulting from balanced current flows.

Abstract: An electrical generator (80) utilizes supplemental blowers or fans (140) to move additional cooling fluid through coolant flow paths (116, 124) in the generator, thus reducing the internal temperature of the generator. The supplemental blower comprises a blower (160) for supplementing cooling fluid flow through a discharge coolant flow path (155) and/or a supplemental blower (176, 178) for supplementing cooling fluid flow through an inlet coolant flow path (156). Either supplemental blower has the effect of lowering the peak internal generator temperature (134).

Abstract: Methods and systems consistent with the present invention provide improved online detection of one or more shorts in rotor turns (18) of a field winding (22) of an electric generator. An initial reference inductance LREF is determined by an impedance-measuring circuit (50). A subsequent inductance L is determined by the impedance measuring circuit (50). A data processing system (54) compares LREF to L to determine whether they differ by a predetermined amount. If LREF and L differ by the predetermined amount, an alarm is provided to operators to indicate the presence of one or more shorted rotor turns.

Abstract: An electrical generator (80) utilizes supplemental blowers or fans (140) to move additional cooling fluid through coolant flow paths (116, 124) in the generator, thus reducing the internal temperature of the generator. The supplemental blower comprises a blower (160) for supplementing cooling fluid flow through a discharge coolant flow path (155) and/or a supplemental blower (176, 178) for supplementing cooling fluid flow through an inlet coolant flow path (156). Either supplemental blower has the effect of lowering the peak internal generator temperature (134).

Abstract: A combustion turbine system of this invention includes a compressor, a combustor, a turbine section, an external blower, an electrical generator and a prime mover for powering the blower and the compressor. The compressor produces a compressed air that mixes with fuel in the combustor to produce a hot gas. This hot gas is sent through the turbine section of the combustion turbine system to drive a rotor. The electrical generator may be coupled to the rotor, so that rotation of the rotor causes operation of the electrical generator. The rotor may also be coupled to the compressor, so that the rotation of the rotor also drives the compressor. The blower of this invention is external to the generator and provides a cooling medium for the electrical generator. The prime mover is coupled to the external blower so that it can power the blower and provide the cooling medium for the electrical generator. In addition, the prime mover is selectively connectable to the rotor, so that it can turn the rotor.