DB POWER LIMITED, RAIGARH
2 X 600 MW Power Plant
SOP for CHARGING OF GENERATOR
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DB / SOP / GEN
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WORK INSTRUCTIONS
FOR
CHARGING OF GENERATOR
[DB / SOP / GEN]
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DB POWER LIMITED, RAIGARH
2 X 600 MW Power Plant
SOP for CHARGING OF GENERATOR
Issue No:
Issue Date:
Revision:
Revision Date:
DB / SOP / GEN
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Page 2 of 8
Amendment Record
Amendment
Rev
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Amendment
Date
Nature of Change
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DB POWER LIMITED, RAIGARH
2 X 600 MW Power Plant
SOP for CHARGING OF GENERATOR
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Page 3 of 8
1.0 Purpose:
This Procedure is intended to provide guidance and instructions for carrying out the
procedure for charging and synchronizing of generator.
2.0 Responsibility:
a) All the personnel involved in carrying out /supervising the above activities are
required to ensure implementation of this procedure.
b) In the event of any changes required in the procedure such changes may be
requested with Site Incharge, who would take appropriate action with approval
from respective departmental heads.
3.0 SAFETY AND ENVIRONMENTAL MEASURES/ CHECKS:
1. Work area should be clean & no oil, grease splitting should be there.
2. Safety signs should be marked wherever required.
3. Readiness of fire fighting equipments.
4. Ensure no oil leak at bearings area.
5. All GRP relays are reset. ( 186AI/286A1/186A2/286A2/186B/286B/186C/286C)
6. ALL H 2 Coolers are charged and H2 purity is > 98%.
7. GCB DC power supply is normalized
8. GCB earth switch is open
9. Generator Bus duct Pressurization system is in service & flow < 45 cu mtr
10. Flow of Water through stator winding > 80 M3/hr
11. Stator water Conductivity in main ckt = 2.0, Regen Ckt < 1.2 ms/cm start > 2.5
stop.
12. Stator cooling H2 gas rated pressure is 5 kg/cm2. (For better DP control, after
synchronization pressure should be made 3.5 ksc).
4.0 CHARGING OF GENERATOR:
ACTION
OBSERVATION
REMARKS
1.CHECK all the
generator Parameters
are healthy
-Stator cooling water flow
more than ------- T/Hr.
-UCB indication
- Stator cooling water temp
Less than ------------- C.
-UCB indication
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DB POWER LIMITED, RAIGARH
2 X 600 MW Power Plant
SOP for CHARGING OF GENERATOR
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-Cold end hydrogen temp less
than -------------------C.
-UCB indication
-Seal oil pressure at exciter end
-------------- KSC.
-UCB indication
-Seals oil D.P. between
----------KSC.
-UCB indication
-Generator stator water
Specific conductivity is less than
--------------- mho/cm.
-UCB indication.
Alarm: ----mho/cm
Trip: -------mho/cm
-Gen. hydrogen and stator water
coolers are charged and
''Clarified water pressure to
hydrogen &Stator water coolers
low'' alarm is not on.
-Local operation.
Remote function
-Turbine RPM is more than
--------- rpm. Generator isolators
are closed from switchyard.
-UCB & switchyard
operator's
responsibility/ UCB
indication
-Generator excitation control
Is on REMOTE.
-Field breaker does not
close from UCB if
control is on local
-Generator excitation control
is on MANUAL OR AUTO
3. CLOSE the generator
Field breaker.
Page 4 of 8
-UCB indication
-Seal oil pressure at turbine end
---------------- KSC.
2. CHECK before closing
the field breaker before
Synchronisation.
DB / SOP / GEN
-UCB indication.
-AUTO/MANUAL excitation
Controllers are on HOME
Position.
-Associated white lamp
is ON. If not, lower it
down to home position
-Generator field breaker gets
closed & Generator voltage
-Associated red lamp
comes on.
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DB POWER LIMITED, RAIGARH
2 X 600 MW Power Plant
SOP for CHARGING OF GENERATOR
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Page 5 of 8
Increases to 21 KV approx. on
manual /auto excitation control,
Respectively.
4. RAISE generator
excitation manually, to
raise gen. voltage
-Field current and voltage
also increases ----- A & ------ V
respectively
-UCB indication
-Generator voltage comes to
21 KV approx.
-UCB indication.
-Field current and voltage
increase to -------A & ---------V
Respectively.
-UCB indication.
-Generator gas and rotor
winding temperatures start
Increasing.
-Maintain all temps
within LIMITS
Parameters
Cold gas temp
(HI)
Hot gas temp.
(HI)
Rotor winding
temp HI
5. CHECK all the
generator voltages
(phase to phase)
Alar
m
---- C
Trip
---- C
---C
-----C
---C
---C
All the three phases
should read equal voltages
UCB indication
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DB POWER LIMITED, RAIGARH
2 X 600 MW Power Plant
SOP for CHARGING OF GENERATOR
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Page 6 of 8
6. SWITCH-ON the
Synchroscope to CHECK
mode.
-IN-COMING/RUNNING
voltages and frequencies
start showing on their
Corresponding meters.
-UCB indication &
Operation
- Alternatively
synchroscope is put on
Check mode and auto
synchroniser can be
Switched on.
-Synchroscope needle starts
rotating at a rate
proportional to difference
between the generator and
Grid frequencies.
-If the direction of
rotation is clockwise
the incoming
generator frequency
is higher than the
Grid & vice-versa.
7. ADJUST turbine speed
reference to match
generator freq with the
grid (running).
-Incoming and grid
frequencies should become
equal
-Synchroscope
Indications
-Synchroscope needle slows
down as the frequencies
match
8 ADJUST generator
excitation to match the
gen. voltage with that
of grid.
-Grid and generator
voltages start matching
-Incoming freq. Must
be higher than that of
grid before
synchronising.
-UCB/synchroscope
Meter readings.
-As synchroscope needle comes
to 11'O clock position
(clockwise), the
green CHECK lamp comes on &
the red lamp goes off. At 12' O
clock position the check lamp
goes off and
red lamp comes on again.
-With synchroscope on
check mode the
generator can be
synchronised
(breaker closed) only
When the green lamp
is on.
9 CLOSE the generator
breaker when the
check lamp is green.
-''Generator Breaker'' gets
closed, if all parameters
are matching during the
''close'' command
-If the breaker fails to
close.'' Gen. Breaker
Trip'' alarm comes on.
re-set and try again.
- ''Generator motoring'' alarm
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DB POWER LIMITED, RAIGARH
2 X 600 MW Power Plant
SOP for CHARGING OF GENERATOR
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Page 7 of 8
Comes on.
-Synchroscope needle gets
locked in 12'O clock
position
-Synchroscope red
lamp stays "ON"
-Generator line charging
MVAR (approx.-80 MVAR)
Indication comes on.
-Power factor becomes
leading for some
moments and
becomes unity again
depending upon the
gen. Load and
excitation.
9A. INCREASE Starting
Device to 100%
-Starting device comes to
100 %.
10 RAISE speed
reference slightly to
increase Gen load,
immediately after
closing the generator
breaker
-Turbine load increases to
----- MW approximately.
Speed reference can
be operated from
generator desk if the
ATRS selector switch is
on UCB mode.
-motoring'' alarm clears off.
UCB indication
- ''Speed controller'' transfers
to 'Load controller'' after some
time delay.
UCB indication
-Excitation null voltage
Becomes zero.
-UCB indication.
-Automatic voltage regulator
gets transferred to Auto.
-Manual channel
backs the auto
Channel if AVR is on.
11. RAISE excitation auto
set point until the
excitation null voltage
becomes zero and
TRANSFER excitation
to auto
-UCB indication.
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DB POWER LIMITED, RAIGARH
2 X 600 MW Power Plant
SOP for CHARGING OF GENERATOR
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12 CHECK all the
generator parameters
are OK and all
phases show equal
currents.
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Generator winding temperatures
less than 85C (alarm.)
Generator transformer winding
temp less than ---------C
(alarm.).
Page 8 of 8
UCB indication.
UCB indication.
Rotor winding temp are less than
--------C (alarm).
UCB indication.
Gen. cold gas temp is less than
------------- C (alarm).
UCB recorders.
Hydrogen cooler inlet water
temp is less than --------C (max.)
Local/DAS check
Hydrogen cooler outlet water
temp is less than ----C (max.).
Stator water temp at the inlet of
stator is less than --------C
(max.).
DAS/Local check
DAS/Local check
Stator water outlet temperature
is less than -----C (max.)
UCB/Local check.
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