Lesson 7: Transformers Flashcards
1
Q
- What is the function of a transformer?
A
To either step up or step-down voltage.
2
Q
- List the items that should be checked on a transformer.
A
Fans operating when put in manual Oil Level Oil Temp. Oil Leaks Nitrogen Pressure Grounding Strap Fins clear of debris Hot spots/Arcing
3
Q
- List the buses associated with the following equipment:
a) Precipitator-
b) Cooling Tower-
c) Ponds-
d) Boiler/Steam Generator equipment-
e) Lagoons East and west-
f) Bag House-
A
a) R, S
b) F, G, M
c) T
d) D, E, H
e) F, G, M
f) J, K
4
Q
- Our station power consists of 3 main voltages. What are they?
A
6900 V
4160 V
480 V
5
Q
- List the voltages on the following buses
a) A & B
b) P & Q
c) All others
A
a) 6900 V
b) 4160 V
c) 480 V
6
Q
- List the equipment serviced by “A” bus 6900v, “B” bus 6900v.
A
ID Fans FD Fans Soot Blower Air Compressors Electric Fire Pump 480 Transformers
7
Q
- List the equipment serviced by “P” bus 4160v, “Q” bus 4160v.
A
Coal Mills
Circulating Water Pumps
Aux. Circulating Water Pumps
8
Q
- List all the 480v buses on Unit #1, #2 and #3.
A
Unit #1: D,E,H, F,G,M, J,K R,S T
Unit #2&3: D,E,H, F,G,M, J,K
9
Q
- What safety precautions should always be observed before racking out a breaker?
A
Equipment is NOT running
CRO is aware of the breaker being racked out
Hold Card matches the appropriate equipment
Arc Flash suit is on
10
Q
- List the items to be checked on all breakers.
A
Hot Spots Fire/Smoke Weird Smells Unusual Noises Arcing Flag Indicators Indicator Lights Tags
11
Q
- Explain the Kirk Key operation (CT Circ. Pump). Where are the Kirk Keys located?
A
It’s an Interlock System that allows the isolation of equipment. Used in High Voltage Switch Gear and the TR sets.
12
Q
- Explain how to manually close or open any size breaker.
A
Open: Verify equipment is not running Wear proper PPE Call CRO Rack breaker out Place hold cards
Close: Wear proper PPE Remove Hold cards Call CRO Rack breaker In
