Harmonic simulation programs have been used in the power quality field for many years, however rarely does a user of a program get the opportunity to verify simulation results with actual field measurements. This paper documents a power quality inquiry completed for an industrial customer. The customer had their own 24kV distribution system which was serving a large harmonicproducing load. The resulting harmonic distortion was severe enough to create problems for their production equipment. This distortion was also exacerbated by four switched capacitors on their 24kV substation bus. A harmonic simulation tool was used to model the industrial facility, analyze the effects of the capacitors, and identify the most effective and economical solution. Field measurements verified the model as well as the effectiveness of the applied solution.
To gain greater standardization than is possible by manual means, a dual selective amplifier was designed and constructed with an especially cut set of test records for the administration of a blinker modification (i) of Thurstone 's 1943 Code Aptitude Test (2). This set-up enabled the experimenters to give instructions auditorially concerning Morse Code signals presented visually, the time intervals between instructions and code signals, as well as the speed at which the signals are sent, being held constant from one testing period to another.The basic principle of the dual selective amplifier is not new. However, since its applications to psychological research and testing are broader than for the particular test for which it was constructed, its design is given here. The particular constants used for this unit are given in Diagram 1, with a description of the essential parts included in Table I. Both diagram and table are self-explanatory, • : 7N7 7N7 CH3 DIAGRAM I. Wiring diagram for dual selective amplifier.
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