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IEEE 1290-2015 pdf free

IEEE 1290-2015 pdf free.IEEE Guide for Motor-Operated Valve (MOV) Motor Application, Protection,Control, and Testing in Nuclear Power-Generating Stations.
For the purposes of this document, the following terms and definitions apply. The IEEE Standards Dictionary Online should be consulted for tern not defined in this clause.6
duty cycle time of a valve actuator motor (VAM): This is the duty rating time divided by the stroke time of the ‘.ake to determine the number of strokes before exceeding the duty rating
duty rating of a salve actuator niotor (VAM): The amount of time the motor can run at full load without overheating. The duty time is normally IS minutes for ac and S minutes for dc nuclear-grade motors. VAM duty time takes into account required run torques. starting frequency, operating times, and motor insulation temperature limitations.
inrush current: Thc rapid changc of current with respect to timc upon motor energization. Inrush current is dependent upon the voltage impressed across the motor terminals and the motor inductance by the relationship V L di.dt.
limit position seating: A control scheme that uses the limit switch as the primary control ft,r operation of a valve actuator motor (yAM). The limit switch controls the VAM by interrupting power to the motor contactor when the valve and actuator have completed a predetermined travel or number of gear revolutions.
locked-rotor current: The steady-state current taken from the line with the rotor locked and with rated voltage and rated frequency applied to the motor.
locked-rotor torque: The torque output capability of the valve actuator motor (VAM) at zero speed and rated voltage and frequency.
motor rpm: The motor rpm listed on the nameplate information is typically the revolutions per minute of the motor under running conditions at 20% of the motor start load rating. AC motors arc normally designed for IXOO rpm. but will be listed at lower rpm based on the running load criteria. DC motors are typically set up for 1900 rpm, but can vary greatly due to small changes of load. Calculating stroke times on dc motors is very diflicult due to the rpm variations while ac motors do not vary much from their rated rpm even under higher loads.
nonlocking gear (rain: A power transmission gear train design that allows the power train to back-drive (or slip) whenever the primary driving force is removed.
overload: Operation of equipment in excess of normal, full-load rating. or of a conductor in excess of rated ampacity, which, when it persists for a sufficient length of time, would cause damage or dangerous overheating. The “slow-blow” fuses located typically in the motor control center (MCC) arc sometimes referred to as healer twerloads designed to protect the motor under overload conditions. A fault such as a short circuit or ground fault is not an overload,
run torque: The output torque of the motor during rotation or running. Run torque is typically 20% of the start torque.IEEE 1290 pdf free download.

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