ROLLING & SYNCHRONIZATION

CHECKLIST

UNIT: DATE: SHIFT:

TIME/
S. NO DESCRIPTION CHECK
REMARK
Ensure turbine BOP is running & EOP is in interlock, bearing oil header pressure is >0.084 Mpa &
1
Temperature 30-38◦C.
2 Ensure MOT level is normal, Oil vapor extractor fan is running & Lube oil cooler is charged.
Ensure AC JOP-1 is running. AC JOP-2 & DC JOP is in standby. Jacking oil header pressure is maintaining
3
10~16MPa.
4 Ensure instrument air supply to turbine valves and turning gear is normal.
5 Ensure turbine on turning gear and eccentricity <0.076 mm.
Ensure Air side & H2 side AC Seal oil pump is in service and DC pumps are in interlock. Check Seal oil
6
Vapor Extractor fan in service
7 Ensure H2 Pressure >280 kpa & H2 purity is more than 96%.
Ensure stator coil cooling water pump is running, other pump is in Interlock & tank level normal, flow is
8
adequate. Ensure stator water conductivity is <1.5 μs/cm.
9 Ensure vacuum pump running and vacuum is > -87 Kpa.
10
Ensure all MAL drains & extraction line drains are open
11
Ensure MS temp with FSMT and HRH temp with IPBDT for 56 0C degree superheat
12
Ensure that startup steam parameters are achieved as follows
13
(a) For cold start (i.e. if HP shaft temperature < 204 0C)
MS - 5 Mpa & > 340 0C and HRH ≤ 0.828 Mpa & >320 0C
14
(b) For warm start (i.e. if HP shaft temperature 204<t<300 0C)
MS - 7 Mpa & > 360 0C and HRH ≤ 0.828 Mpa & >330 0C
15
(c) For hot start (i.e. if HP shaft temperature 300<t<400 0C )
MS - 10 Mpa & > 490 0C and HRH ≤ 0.828 Mpa & >470 0C
16
(d) For super hot start (i.e. if HP shaft temperature > 400 0C)
MS - 10 Mpa & > 510 0C and HRH ≤ 0.828 Mpa & >480 0C
17
Start EH oil pump & keep other pump in interlock and ensure pressure is >11 Mpa and temp is 30-45◦C.
18
Start HP sealing oil pump & pressure is about 8.8 ksc
19
Charge CCW for exciter and generator cooler.
20
If mill is in service, stop the feeder & restrict oil burners to 7.
21 Gradually close HP bypass valve & its spray valve. Once negative pressure is achieved in HRH, close LP
Bypass valve & its spray valve
22
Remove MSV trip link at GRP ch-1 & ch-2.
23
Select BP off mode
24
Reset the turbine near front pedestal with latching lever. Record AST pressure
Reset turbine from DEH screen LATCH button and observe RSV, GV and IV will go for full open. If valve is
25
not going for open, in DEH overview page press TM PANEL icon, open GV valve and IV valve manually to
120%.
 TIME/
S. NO DESCRIPTION CHECK
REMARK
26
Reset generator protection relay by pressing silence button observe no trips persists
27
Reset Master trip relay by turning class a b c lever
28
Normalize MSV trip link at GRP ch-1 & ch-2. Ensure all inputs to ETS is reset.
29
Reset relay at 400 kV control room
In DEH Screen do the following , ensure barring gear in AUTO
30
 Control mode → auto mode → IN (check OA indication appears)
 OPC mode → OPC Test-out ; 103% INH → CANCEL ; 110% INH →CANCEL
31 In DEH overview, press LIMIT SET icon and set high load (HL) = 315 MW, low load (LL) = 0 MW and valve
position (VPL) = 120%. Indication for HL & LL is OUT and VPL is IN.
32
For cold rolling
 Roll the turbine to 600 rpm @ 100rpm/min and hold for 15 mins. If turbine reaches 3 rpm check turning gear is
disengaged & turning gear motor stops automatically.
 Raise the speed to 1970 rpm @ 250 rpm/min & soak for 3 hours. Soaking is not necessary if turbine HP & IP
rotor metal temp >121 0C.
 During soaking period limit the throttle inlet steam temperature to 427 0C Max and maintain reheat inlet steam
temperature above 260 0C.
 Raise the speed to 2950 rpm @ 250 rpm/min. Ensure JOP stopped at 2600 rpm & LP cylinder spray valve
opens.
33
For warm, hot and super hot rolling
 Roll the turbine At 600 rpm @ 100rpm/min and hold for 4 mins. If turbine reaches 3 rpm check turning gear is
disengaged & turning gear motor stops automatically.
 Raise the speed to 2950 rpm @ 250 rpm/min. Ensure JOP stopped at 2600 rpm & LP cylinder spray valve
opens.
34
Record casing & differential expansion, rotor position and turbine vibration are normal.
35 Ensure lube oil bearing inlet < 45 0C, lube oil, sealing oil, H2 pressure, lube oil level and seal oil /hydrogen
DP are normal.
36
Ensure the Top and bottom temp difference of inner casing of HP&IP < 42 ◦C.
37
Ensure Bus side & Bay side isolators closed condition & breaker is ready for close.
Before TV-GV Transfer, Chest Metal Temperature should be not less than corresponding saturated steam
38
temperature for the throttle pressure. Calculation for steam chest metal temperature (Tc) =Ts+1.36 (Td-Ts).
Ts=SCSLT & SCSRT, Td= SCDLT & SCDRT
39 Go to valve mode, ensure SIG/SEQ selection in SIG and press TV-GV transfer, GV will go for Min position
and TV will go for full open.
40
Stop Hp sealing oil pump & BOP and put in interlock.
41
Set the speed according to the grid frequency and set the rate of rise to 50 rpm/min.
42 On UCP select GT breaker selector switch to AUTO synchronization. If auto synchronization is not available
skip to point no. 54
43
In DCS, open Electrical main screen in which click Exciter icon, Switch off CH-1 & CH-2
44
Make CH-1 ON and CH-2 stand by
45
Close Field breaker
46
Make excitation ON & observe terminal voltage is around 15 kV
47
Again click excitation on button & observe terminal voltage is around 19 kV
48
Raise generator voltage to 20 kV by clicking excitation RAISE button.
 TIME/
S. NO DESCRIPTION CHECK
REMARK
49
Click synchronization icon in electrical main screen and select CB1 GT synch
50
Engage auto synch- ON in UCP panel and DCS SYNCHRONIZATION CONTROL.
51
Go to DEH Screen → control mode →auto synch IN
52
In synchronization screen press “ASS START SYNCH”. Check no auto synchronizer fault.
53
After synchronization, quit auto synchronization in DCS. Skip to point no. 57
54
Switch selectors for synchronoscope LED and synch selection to ON in UCP panel.
55
Ensure in UCP panel, synchronization selection switch in manual position
56 Match the generator voltage & frequency from DCS. While Synchronoscope LED is moving in clockwise
direction, close GT breaker between 11~ 12 o’clock position.
57
Go to DEH overview screen. Click feedback mode, select MW loop IN
58 Enter MW target -15MW and Rate – 1MW/min (cold), 3MW/min (Warm), 4MW/min (Hot), 6MW/min (Super
Hot). Ensure load picks up.
Control room shift operator 1 ………………………… Signature ………………….
2 ………………………… Signature ………………….
 For major / critical activities, starting & ending times may be mentioned.
 The Shift charge engineer shall verify atleast 5 important / critical steps, at random.