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Electrical Training Seminar Description
Medium Voltage Systems
Course Length – The Medium Voltage
Training Program is 3 Days in length with one optional evening lab session
on the second day, 7 - 9 P.M., for additional hands-on experience with
three-phase transformer connections, phase angle measurement, protective
relay testing or programming, or use of the Kilowatt Classroom Radial
Feeder Analysis Software©.
Synopsis – The Medium Voltage Training Seminar is an advanced level
electrical course designed for individuals who are involved with
medium voltage (2.4 kV - 34.5 kV) electrical distribution, substation,
and utilization equipment found in industry. Electrical system
protection is covered in detail including: fuse selection, protective
relay applications for medium voltage motors and radial feeders,
protective relay programming, and system coordination considerations.
The course is idea for individuals who are installing new, programmable
electronic protective relays. There is also a strong emphasis on safety, electrical preventive maintenance
testing, and preventive maintenance procedures that will reduce costly
plant downtime.
Who Should Attend – Apprentice Electricians, Journeyman
Electricians, Maintenance Technicians, Plant Engineers, Supervisors, and
Inspectors.
Curriculum - . Introduction: Medium
Voltage Training Seminar Overview, Standard
device designation numbers, reading high voltage prints, substation
arrangement.
AC Systems review:
Inductive and capacitive reactance, impedance, power triangle, working
with phasors.
Characteristics of Three-Phase Power Systems:
Delta, Wye, resistance grounded neutral systems.
Single-Phase Transformers:
theory, construction. Single-phase transformer lab work: turns ratio,
polarity, impedance. Three-phase connection lab work with phase angle
measurement. Power Transformers: Winding
configurations, kVA ratings, cooling methods, oil preservation systems,
gauges and alarms, no-load tap changers, lightning protection, house power
transformers.
Power Circuit Breakers: Interrupting methods: air, oil, vacuum,
SF6. Circuit switchers. Operating mechanisms, control schemes, tripping
methods. Introduction to Medium
Voltage System Protection: System requirements, protection
terminology; impedance, available fault current, sensitivity, selectivity.
Medium Voltage Fuses: Types, curve
interpretation, fuse ratings. Fusing of motors, transformers, capacitor
banks, and distribution lines. Instrument
Transformers: PT’s, CT’s, types, connections, burdens, accuracy,
safety. Protective Relaying: Applications,
types, operating characteristics. System Protection
Engineering Exercise: Development of a typical medium voltage motor
coordination diagram, or independent study. Relay
Lab Work: Programming, connection, and testing of a typical
microprocessor based medium voltage motor protective relay or feeder
management relay. Using the Radial Feeder Analysis Software:
Calculating system impedance, available fault current, and motor starting
voltage drop. Voltage Control:
Under-Load-Tap-Changers, theory of operation; line voltage regulators,
line-drop-compensation; capacitor banks, capacitor control equipment.
Gang Switches: Hand and motor operated, load-break, isolation,
grounding. Distribution Line Equipment: Pole
and pad mounted transformers, pad mounted switchgear, reclosers,
and sectionalizers. High
Voltage Cables: Types, terminating requirements and methods.
Medium Voltage Motors: Maintenance,
temperature and vibration monitoring. Preventive Maintenance Testing
Overview: Insulation testing; insulation resistance, power factor, DC
hipot. Insulating
oil tests: dielectric, acidity, interfacial tension, color, dissolved gas.
Circuit breaker speed testing, point-of-contact determination, contact
resistance. Transformer Turns Ratio. Transformer leak
detection. Ground system testing. Testing Lab Work:
Ground System Testing (Fall-of-Potential Method),
DC Hipot, and Oil Dielectric. Safe
Switching Practices: Clearance procedures, lockout and tag-out methods, Kirk Key® interlock
systems. Station Batteries: Types,
inspection, maintenance.
Prerequisites - Electrical Fundamentals Course or Equivalent
Experience.
Included Materials – All
participants in the Medium Voltage Training Seminar will receive specially developed text and lab material from The Industrial Electrician's
Notebook. Included is the Kilowatt Classroom Radial
Feeder Analysis Software© for calculation of feeder impedance, available fault
current, and motor starting voltage drop. (This program requires a
computer with Microsoft
Windows and Microsoft Excel already installed). Also included and reviewed
are several versions of freeware offered by fuse and protective relay
manufacturers.
Student Provided Equipment – Attendees in the Medium Voltage
Training Seminar will need safety glasses for
the lab work and an engineering calculator (square root and
trig functions). Students are also encouraged to bring
one-line diagrams and control schematics of the equipment they encounter
in the field. Individuals who have a laptop computer should bring it
in order to fully utilize the provided software. (Attendees without a
laptop will still be able to work with the provided programs using the
instructor's laptop.)
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