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The basic goals of motor protection are allowing the motor to operate as close to thermal limits as possible and isolating the motor when actual failures occur. The basic principles for performing this protection are well known. In most installations, the motor is located close to the protective relay and interrupting device, be it a contactor, starter, or circuit breaker. However, the motor may sometimes...
Protection of motors located remotely from switchgear presents challenges for cost-effective protection of the motors. This paper discusses application issues for motors located 1000 feet or more from protective relays.
Protection of small generators that provide backup or standby power for critical facilities is no different than that of large generators. The challenge is that the CTs and CT secondary circuits for generator protection are not properly designed for the installation. This paper discusses these issues, and makes recommendations for proper design of CT circuits for small generator differential protection.
As low voltage motors are critical assets in today's industrial applications this paper will review the applications of microprocessor-based protection and control on low voltage motors less than 600 V AC in industrial facilities. It will review principles of low voltage motor protection (thermal overload, ground fault, unbalance, etc.). In addition, the paper will discuss the starting control of...
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