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Regardless of the method used to detect winding temperature, the total, or hot spot, temperature is the real limit; and the lower it is, the better. Don’t let excessive heat kill your motors before their time.
This manual covers horizontal and vertical squirrel-cage induction motors in the 300 to 5,000 horsepower range, low- and medium-voltage. Most of the principles covered apply to other sizes as well. This manual focuses primarily on IEC motors and standards.
Submersible pumps may have any of several types of internal sensors or protective devices. These may include temperature sensors, vibration transducers or moisture sensors. The type of temperature and vibration devices are identical to those used in non-submersible style motors, so only the moisture sensors are of special interest regarding submersible pumps. It is important for technicians involved in the repair of submersible pumps to be aware of their presence in any specific pump they may encounter, and understand the manner in which they function to ensure they work properly after repairs are completed.
Las bombas sumergibles pueden tener diferentes tipos de sensores o dispositivos de protección internos, los cuales pueden ser sensores de temperatura, transductores de vibración o sensores de humedad. Los sensores de temperatura y de vibración son idénticos a los utilizados en los motores no sumergibles, por lo que solo los sensores de humedad guardan especial relación con las bombas sumergibles. Es importante que los técnicos involucrados en la reparación de las bombas sumergibles sean conscientes de su presencia en cualquier bomba en los que se puedan encontrar y que comprendan como trabajan para asegurarse que funcionan correctamente después de terminar los trabajos de reparación.
The Institute of Electrical and Electronics Engineers (IEEE) has published a new standard: IEEE Std. 3004.8-2016, “Recommended Practice for Motor Protection in Industrial and Commercial Power Systems.” If you’re an electrical professional who deals with a broad spectrum of motor protection schemes, including low- and medium-voltage AC and DC motors, then you need to become familiar with this standard.
This series of four articles covers many schemes of motor protection and control.
There are a number of different types of winding protection devices used with motors. However, they all basically do the same thing; they sense a change from the normal operating temperature and either sound an alarm or take the motor off line when the specified temperature limit has been met or exceeded. Temperature protection is not limited to just large motors. A smaller motor that is critical to operation would be a good candidate for winding temperature protection if a failure would cause significant costs due to downtime.
This 40-page booklet provides great advice for obtaining the longest, most efficient and cost-effective operation from general and definite purpose electric motors.
This booklet covers topics such as:
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The Effect of Repair/Rewinding on Premium Efficiency/IE3 Motors
Tests prove Premium Efficiency/IE3 Motors can be rewound without degrading efficiency.
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Recommended Practice for the Repair of Rotating Electrical Apparatus
This is a must-have guide to the repair of rotating electrical machines. Its purpose is to establish recommended practices in each step of the rotating electrical apparatus rewinding and rebuilding processes.
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Revised May 2021
The EASA Technical Manual is the association's definitive and most complete publication. It's available FREE to members in an online format. Members can also download PDFs of the entire manual or individual sections.
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