Abstract: A passive filter device for a capacitor in series with a substantially inductive transmission line of an electric transmission system is disclosed. The passive filter device comprises a double-loop RCL filter in parallel with the series capacitor. At power frequency, the filter device allows the power frequency current to pass through the series capacitor with minimum power losses. At sub-synchronous resonance frequencies, the passive filter device provides bypassing of the series capacitor with maximum selectivity of the RCL filter.

Abstract: Apparatus and method to separate the harmonic problems in the load side circuit of an electrical power distribution system from the source side circuit of a source transformer in a reliable and economical manner. The electrical power distribution system includes at least a source of AC electrical power, a load, and the connection from the source to the load including a source transformer, electrical conductors, wires, or cables. A part of the load is the non-linear load which injects harmonics. A harmonic blocking filter, comprised of an existing source transformer and a series combination of an auxiliary transformer and a capacitor, is connected in parallel with the source transformer. The MVA rating of the auxiliary transformer is chosen to be equal or smaller than the MVA rating of the source transformer, and the leakage impedance of the auxiliary transformer is chosen to be equal or larger than the impedance of the source transformer.

Abstract: An improved busway end box construction of the present invention terminates a busway run and provides insulation between the phase bars and the ground bar. The assembly includes an adjustable-height enclosure and an insulation sub-assembly. Adjustment slot in the top cover of the enclosure allows the top cover of the end box enclosure to slidably move up or down, varying the height of the busway end box. The insulator sub-assembly includes insulating walls nesting in between U-shaped comb-like brackets. Notches in the insulating walls provide vertical height to the insulator walls, allowing the insulator sub-assembly height to be self-adjusted as the height of the busway end box varies.

Abstract: A busway construction with a standard elbow section that can be adjusted to a wide range of positions to eliminate the need for specialized elbow sections. This adjustable elbow standard busway section with a full-range rotation is designed to connect to other sections of busway which are at non-standard angles to each other.

Abstract: A utility for rapid development of three dimensional representations of electrical distribution switchgear is provided. These switchgear elevations have logical connections to the switchgear devices. An elevation can be modified to any dimensions with an infinite number of combinations and arrangements of meters and protection devices to quickly and accurately represent a customer's switchgear. Also, an event logger utility is provided for viewing, organizing and analyzing unusual behavior in a power system. The event logger utility passes a received message as an un-acknowledgeable or acknowledgeable alarm or as an event based upon the contents of a initialization file. A utility for the waveform capture is provided for viewing and analysis of waveforms (e.g., Fourier, frequency and/or harmonic analysis) captured by sophisticated metering devices. Waveforms from a device may be super-imposed for analysis. Processing of the collected waveform data to display any one of the eight waveform parameters (i.e., I.

Abstract: A hybrid active power filter having programmed impedance characteristics is presented. In accordance with which, a passive device comprising a capacitor C.sub.F is connected in series with an active device which are together connected in shunt with a power source and a load at transmission lines of a power system. Capacitor C.sub.F substantially supports the full-line voltage V.sub.H of the power source, whereby the active filter is exposed to a substantially lower voltage than the line voltage V.sub.H. The active device includes an active filter, i.e., an inverter current regulator with a programmable controller for executing a control algorithm. The controller of the active device receives signals corresponding to a voltage V.sub.M, at the low side of filter capacitor C.sub.F. Voltage V.sub.M is at a substantially lower voltage than the line voltage V.sub.H, whereby the cost of sensing voltage V.sub.M is significantly less than sensing the high line voltage V.sub.H.