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Webinar Recordings

High Potential Testing Motor Windings with Very Low Frequency

  • October 2021
  • Number of views: 1569
Article

High potential (hipot) testing procedures for motor and generator windings are usually performed with 50/60 Hz AC or DC as the power source. Hipot testing is a critical step in validating the quality of new windings. AC and DC hipot tests are also useful to understand the condition of aged insulation for machines in service. The disadvantage of the AC test at power frequency is when the size of the test set and/or complexity of the setup becomes problematic in motor repair and in the field. And the DC test stresses the end turns more. The very low frequency (VLF) test set has been successfully used to bridge the test gap between AC and DC hipot tests.

Prueba de Alto Potencial en Devanados Usando muy Baja Frecuencia

  • October 2021
  • Number of views: 1225
Article
 Los procedimientos de prueba de alto potencial (hipot) para devanados de motores y generadores generalmente se realizan con 50/60 Hz CA o CC como fuente de alimentación. La prueba de Hipot es un paso crítico para validar la calidad de los devanados nuevos. Las pruebas hipot de CA y CC también son útiles para comprender el estado del aislamiento envejecido de las máquinas en servicio. La desventaja de la prueba de CA a frecuencia industrial es cuando el tamaño del equipo de prueba y / o la complejidad de la configuración se vuelven problemáticos en la reparación del motor y en el campo. Y la prueba de CC enfatiza más los giros finales. El equipo de prueba de muy baja frecuencia (VLF) se ha utilizado con éxito para cerrar la brecha de prueba entre las pruebas hipot de CA y CC.

Considerations for Inrush vs. Locked Rotor Amps

  • June 2021
  • Number of views: 5829
Article

When an AC motor is initially energized at rated voltage (and frequency), the current drawn is many times rated current until the motor attains full operating speed. Consequences of starting current include short time overheating of stator windings and rotors, undesirable operation of overload protective devices and a sag in the supply voltage.

Consideraciones para los Amperios Inrush vs Rotor Bloqueado

  • June 2021
  • Number of views: 4602
Article

Cuando se energiza inicialmente un motor de CA a su voltaje nominal (y frecuencia), el motor toma varias veces la corriente nominal hasta que alcanza toda la velocidad de operación. Las consecuencias de la corriente de arranque incluyen: Breve sobrecalentamiento de los bobinados del estator y del rotor, disparos no deseados de los dispositivos de protección y caídas de voltaje en el suministro eléctrico.

Factors to Consider When Testing DC Armatures

  • May 2021
  • Number of views: 3590
Article

There are a lot of factors to take into consider when interpreting the bar-bar test or surge test. This articles reviews those factors.

Factores a Considerar al Probar Armaduras de CC

  • May 2021
  • Number of views: 4013
Article
Hay muchos factores a tener en cuenta al interpretar la prueba de barra-barra o la prueba de sobretensión. Este artículo revisa esos factores.

US Department of Energy Issues Final Rule for Testing Small Electric Motors

  • February 2021
  • Number of views: 4130
Article

The US Department of Energy (DOE) has issued rulemaking on test procedures for small electric motors for more than a decade. The present “final rule,” effective February 3, 2021, is the culmination of those efforts.

Rewind Study 2020: The Results Are In

The Effect of Repair/Rewinding on Premium Efficiency/IE3 Motors

  • December 2020
  • Number of views: 4980
FREE for Members of EASA
Webinar recording

This webinar covers the results and the technical details of the recently completed follow-up to the 2003 EASA/AEMT Rewind Study.

ANSI/EASA Standard AR100-2020: Recommended Practice for the Repair of Rotating Electrical Apparatus

  • September 2020
  • Number of views: 14499
Booklet

ANSI/EASA AR100 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.

Can Premium Efficient Motors Be Rewound without Degrading Efficiency?

  • June 2020
  • Number of views: 3432
FREE for Members of EASA
Convention presentation

In 2003, EASA and AEMT (Association of Electrical and Mechanical Trades in the UK) issued a report that proved rewinding motors in accordance with prescribed good practices would maintain efficiency and reliability. But in recent years, claims abounded that premium efficient motors could not be rewound without degrading efficiency. This recording discusses the latest EASA/AEMT research that included independent, third-party testing.