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Turner S.,Beckwith Electrical Company Inc.
2011 64th Annual Conference for Protective Relay Engineers | Year: 2011

Arcing faults occur due to dirty insulators or broken strands in the stator windings. Such faults if undetected can lead to overheating along with catastrophic electrical failure. These events typically require extensive repairs with an extended shutdown of the machine. It is highly desirable to detect such faults at an early or incipient stage so that remedial action can be taken before a complete failure occurs. © 2011 IEEE.

Yalla M.V.V.S.,Beckwith Electrical Company Inc.
IEEE Transactions on Industry Applications | Year: 2010

This paper addresses the design of a high-speed motor bus transfer system for power-generating plants and industrial facilities where motor loads require comprehensive source transfer strategies during transfer of the load from one source to another. Motor bus transfer schemes are needed not only to maintain process continuity but also to transfer sources in such a manner to prevent damage to the motors and connected loads. The motor bus frequency and voltage decay rapidly upon disconnection from the main source. This paper proposes a digital signal processing algorithm that can measure the magnitude and phase angle of the decaying bus voltage accurately while measuring the auxiliary-source voltage magnitude and phase angle at rated frequency. This paper details an algorithm to predict the phase coincidence between the motor bus voltage and the auxiliary-source voltage. The algorithm uses delta frequency, the rate of change of delta frequency, and breaker closing time to predict the phase coincidence. This paper also details the implementation of the motor bus transfer scheme that includes fast, in-phase, and residual transfer methods. The results of some real-time transfer cases are also included. © 2010 IEEE.

Turner S.,Beckwith Electrical Company Inc.
IEEE Transactions on Industry Applications | Year: 2014

This paper explains how to supervise the transfer of an important load bus from one source to another in less than one half-cycle. This supervision is required for large-scale industrial processes such as petroleum refineries. © 1972-2012 IEEE.

Mozina C.,Beckwith Electrical Company Inc.
IEEE Industry Applications Magazine | Year: 2010

This article discusses green power distributed generation DG sources of 10 MW or less, which are connected to a utility system at the distribution level, and their impact on distribution system reliability. The article also summarizes the specific reliability and protection issues in interconnecting green power generators to utility systems to mitigate the aforementioned reliability issues. These issues are not adequately discussed in IEEE standard 1547, which addresses the interconnection of DG to utility systems. © 2006 IEEE.

Mozina C.J.,Beckwith Electrical Company Inc.
Papers Presented at the Annual Conference - Rural Electric Power Conference | Year: 2010

A significant amount of wind power is being installed at the distribution level through the installation of wind power generation facilities in many parts of the United States and Canada. These generators operate in parallel with utility distribution feeders. It is forecasted by many experts that the installation of wind power generation will be increased due to the need to provide more clean energy. Utility regulators are encouraging wind power by setting high buy-back rates or setting goals for utilities to provide a portion of their generation from green sources. This paper discusses wind power generating sources (of 3 MW or less), which are connected to the utility system at the distribution level, and their impact on the distribution system. The paper will also discuss the various types of wind generators (Type I through IV) and their fault current contributions to system supply faults. Index Terms Wind generation, point of common coupling, interconnection protection, induction generators, double-fed induction generators, ferroresonance. © 2010 IEEE.

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