Behavior of transformer insulation under short-time overvoltage
This paper reports on a series of tests made on transformer insulation samples with automatically applied short-time a.c. overvoltages above the corona inception level to determine the conditions under which damaging corona occurs. Modified dielectric tests for power transformers are discussed.
A method for wide frequency range modeling of power transformers and rotating machines
Wide frequency range representation of power system components such as power transformers, reactors, and rotating machines is mainly needed for the analysis of electromagnetic transients in power systems. A method is presented for state space formulation of machine windings. The described procedure is completely based on external terminal impedance measurements, and data related to the internal structure are not required. The wide frequency behavior of machine windings is reviewed, and the nonlinearity effects of the iron core are discussed. A numerical method is given for calculation of the state equation parameters directly from the measured terminal impedance characteristics. The presented modeling method is applicable to any transformer, reactor, or rotating machine in service where sufficient information on the internal design is not available. The canonical structure of the model offers advantages in terms of computer memory and computational effort in time domain analyses of complex power systems.<<ETX>>
Tethering the Administrative State: The Case Against Chevron Deference for FCC Jurisdictional Claims
Like many other agencies, the Federal Communications Commission has seen significant regulatory growth under President Obama. But unlike health care, financial reform, and other areas, this growth has come without statutory guidance from Congress. The FCC’s assertion of jurisdiction over broadband service is reminiscent of its earlier attempts to regulate cable and to deregulate telephone service, efforts that courts have viewed skeptically in the absence of specific statutory authorization. But this skepticism is in tension with Chevron, which grants agencies substantial deference to interpret ambiguities in the statutes that they administer. This article argues that Chevron deference should not extend to agency jurisdictional claims, such as the FCC’s claim to authority over broadband. For both constitutional and policy reasons, courts should distinguish between agency action that fills a gap in a statutory scheme and action that defines the outer boundary of that scheme. As the Commission’s net neutrality project winds its way through the judicial system, courts should not allow the agency to define the limits of its own authority, and should instead search closely for a grant of authority from Congress.