EDG

Question 1

EDG Loss of power TS

Answer 1

Two loss of voltage and two degraded voltage function relays operable

modes 1-4

Question 2

parameters of the overcrank alarm and the actions

Answer 2

EDG will alarm if cranking signal present for 45 seconds and EDG speed <300 rpm

Take EDG to lockout

Question 3

design of T-57s

Answer 3

22.5k gallons each
gravity fed
provide 3.5 days of fuel per diesel

Question 4

fuel system numbers (p-16 a/s & hi dis, t-57 level, day tank #’s & alarms, fo priming pump)

Answer 4

• P-16s a/s 180 gal in day tank, stop @ 240 gal
• fuel oil priming pumps start on edg a/s and stop @ 300 rpm
• P-16 hi discharge press @ 30 psig
• t-57 low @ 155”
• day tank lo level alarm if <180 gal for >3 min

Question 5

Fuel oil pump is attached to scavenging LO pump and riven from shaft or electrically?

Answer 5

shaft driven

Question 6

what speed is mechanical overspeed trip

Answer 6

990-1045 rpm

Question 7

Main lube oil pressure EDG trip

Answer 7

17 psig

Question 8

Diesel run indication provided when main lube oil pressure is ____.

Answer 8

20 psig

Question 9

immersion maintain lube oil at what temps

Answer 9

energizes at 125F and deenergizes at 155F

immersion heat is on water side

Question 10

purpose of soakback pumps

Answer 10

maintain engine oiled and ready to start

Question 11

immersion heater purpose

Answer 11

warms lube oil for fast start. on water side

Question 12

compressors cycle on and off at __

Answer 12

on at 186 psig

off at 200 psig

Question 13

Tech spec for air receiver pressure

Answer 13

<175 psig causes inop of EDG

Question 14

Receiver tanks are good for ___ starts from each set.

Answer 14

5 starts @ 175 psig

Question 15

what will disengage air start motors?

Answer 15

engine rpm>300 rpm
air start for 8 seconds
main lo pressure >20 psig

Question 16

how often do air start motors swap?

Answer 16

2.5 seconds if engine <30 rpm

Question 17

overcrank alarm

Answer 17

45 seconds

Question 18

3.8.3 - fuel oil and starting air

Answer 18

fuel oil and starting air within limits

Applicability: when EDG req’d to be operable

Question 19

3.8.1 - AC Sources

Answer 19

two offsite power sources
two diesels

modes 1-4

1 of four inop, perform SR in 1 hour
3 of 4 inop, 3.0.3

Question 20

3.8.2 AC Sources shutdown

Answer 20

1 offsite power source
1 diesel

modes 5 and 6

Question 21

generator specs

Answer 21

3 phase, 2750 kw, 4160v, 60 hz

max starting time 15 seconds

Question 22

field flashing circuit powered from ___?

Answer 22

125vdv D-11/D-21

Question 23

A/S for EDGs

Answer 23

ES 1 OR 2 will start both diesels

UV on A3/A4 - 3300.5V for 2.3 seconds
UV on B5/B6 - 429.6V for 8 seconds
UV on B5/B6 - ES Signal present 407.6V for 3.3 seconds

Question 24

Autostart permissives

Answer 24

• control switch not in maint
• E-trip relay not energized
• lockout switch not in lockout
• trip relay not energized
• output brkr not in PTL

Question 25

E-Trip relay energized

Answer 25

• mech overspeed 990-1045 rpm
• lo lube oil press <17psig (blocked until 300 rpm & 20 seconds)
• pos crankcase press 0.8”-2.5”
• local e-stop

Question 26

edg lockout relay energized on:

Answer 26

• gen phase diff
• overcurrent
• loss of gen field w/ gen brkr shut
• gen motoring
• engine trip on K-11

Question 27

start pilot relay de-energized:

Answer 27

• control selected to maint
• C-10 switch in lockout
• K-11 relay energized
• EDG lockout relay tripped
• local/remote stop PB pushed

Question 28

ways to stop engine manually

Answer 28

• in CR
• local stop pushbutton (disabled on ES)
• load limit control on gov
• fuel shutoff valve
• switch in maintenance

Question 29

Vital Bus Loads

Answer 29

HPI - 602 kw
LPI - 305
Spray - 203
SW - 305
B5/B6 - 900/900
P-7B - 500

Question 30

EDG Start sequence

Answer 30

• A/S signal received
• run solenoid energized
• gov boost motor energized

-air start motors alt every 2.5 secs until >30 rpm
and will disengage at 300 rpm, 8 sec after start signal, 20 psig LO press

-fuel priming pump/gov boost motor deenergize at 300 rpm

Question 31

Functions of Voltage regulator and Gov control when not on grid or tied to bus.

Answer 31

voltage reg - adjusts voltage

gov control - adjsuts freq

Question 32

Functions of Voltage regulator and Gov control when tied to the grid

Answer 32

Voltage reg - reactive loading

gov control - adjust kw