Two Night Seminar Covering Motor Fundamentals
This course is geared towards practicing electrical, control and instrument engineers who perform engineering on facilities within the process industries.
Abstract: Tuesday – Electrical Motor Maintenance Testing – Low voltage (480 & 600V, Medium Voltage 2300V and up). AC machines electrical review with DC being only peripherally (vibration and most bearing issues are not covered).
Subject matter covered:
• What tests and how often?
• Why do we want to test?
• Management & maintenance styles
• Environment and enclosures
• Size & variety in fleet as well as age of machines
• Spares and Urgency of downtime
• Failures – predicted / not
• Visual examination, sounds, smells (look at grounding brush)
• Environment – temperature and humidity
• Insulation Resistance
o How hard does it have to be? On-line / Off-line
o Voltage test levels and acceptance criteria
o Temperature correction
• Space heaters
• DA and PI
• Stepped DC
• Low frequence AC
• AC high pot
• Surge test (Baker)
• Impedance test (PDMA)
• Winding resistance (stator & field)
• Capacitance
• Partial Discharge On-Line
• Acceleration time & current
Wednesday – Review of all the basics. This is exercise, be ready to work, there will be problems to solve!
The little bit of arithmetic that I think you should know -Memory
• DC
o Ohm’s law
o Shunts
o Resistor networks
• Single phase
o Current, Power real and imaginary Power factor
o Capacitance & Inductance
o Measuring CT, PT, shunt
• Three phase
o Current, Power real and imaginary Power factor
o Capacitance & Inductance (lead/lag)
o Induction motor readings (nominal PF)
o Synchronous motor readings (general operation)
o CT & PT circuits used for measurement
o Expected accuracy
Testing components
It is interesting and instructive to manually test these components. Please bring your VOM. I will bring a handful of capacitors, inductors, resistors, some SCR’s and diodes to test.
• Resistor (how accurate is accurate? temperature)
• Capacitor Impedance and capacitance
• Inductor Impedance and inductance
• Diode Voltage drop and reverse breakdown
• SCR Switching & breakdown
Co-sponsored by: Donald G. Dunn, FIEEE
Speaker(s): Dennis Bogh
Agenda:
5:30 pm – 6:00 pm: Dinner Served to all registered attendees.
6:00 pm – 6:15 pm: Annoucements
6:15 pm – 8:30 pm: Presentation
Bldg: Bechtel Energy Building #3, 2105 Citywest Place, Houston, Texas, United States, 77042