EDG Flashcards

1
Q

EDG Loss of power TS

A

Two loss of voltage and two degraded voltage function relays operable

modes 1-4

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2
Q

parameters of the overcrank alarm and the actions

A

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

Take EDG to lockout

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3
Q

design of T-57s

A

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

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4
Q

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

A
  • 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
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5
Q

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

A

shaft driven

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6
Q

what speed is mechanical overspeed trip

A

990-1045 rpm

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7
Q

Main lube oil pressure EDG trip

A

17 psig

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8
Q

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

A

20 psig

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9
Q

immersion maintain lube oil at what temps

A

energizes at 125F and deenergizes at 155F

immersion heat is on water side

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10
Q

purpose of soakback pumps

A

maintain engine oiled and ready to start

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11
Q

immersion heater purpose

A

warms lube oil for fast start. on water side

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12
Q

compressors cycle on and off at __

A

on at 186 psig

off at 200 psig

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13
Q

Tech spec for air receiver pressure

A

<175 psig causes inop of EDG

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14
Q

Receiver tanks are good for ___ starts from each set.

A

5 starts @ 175 psig

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15
Q

what will disengage air start motors?

A

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

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16
Q

how often do air start motors swap?

A

2.5 seconds if engine <30 rpm

17
Q

overcrank alarm

A

45 seconds

18
Q

3.8.3 - fuel oil and starting air

A

fuel oil and starting air within limits

Applicability: when EDG req’d to be operable

19
Q

3.8.1 - AC Sources

A

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

20
Q

3.8.2 AC Sources shutdown

A

1 offsite power source
1 diesel

modes 5 and 6

21
Q

generator specs

A

3 phase, 2750 kw, 4160v, 60 hz

max starting time 15 seconds

22
Q

field flashing circuit powered from ___?

A

125vdv D-11/D-21

23
Q

A/S for EDGs

A

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

24
Q

Autostart permissives

A
  • control switch not in maint
  • E-trip relay not energized
  • lockout switch not in lockout
  • trip relay not energized
  • output brkr not in PTL
25
E-Trip relay energized
- 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
26
edg lockout relay energized on:
- gen phase diff - overcurrent - loss of gen field w/ gen brkr shut - gen motoring - engine trip on K-11
27
start pilot relay de-energized:
- control selected to maint - C-10 switch in lockout - K-11 relay energized - EDG lockout relay tripped - local/remote stop PB pushed
28
ways to stop engine manually
- in CR - local stop pushbutton (disabled on ES) - load limit control on gov - fuel shutoff valve - switch in maintenance
29
Vital Bus Loads
``` HPI - 602 kw LPI - 305 Spray - 203 SW - 305 B5/B6 - 900/900 P-7B - 500 ```
30
EDG Start sequence
- 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
31
Functions of Voltage regulator and Gov control when not on grid or tied to bus.
voltage reg - adjusts voltage gov control - adjsuts freq
32
Functions of Voltage regulator and Gov control when tied to the grid
Voltage reg - reactive loading gov control - adjust kw