How to start and stop the hydro plant

1. STARTING & STOPING
OF
HYDRO MACHINE
Saurabh Mahajan
Assistant Director
NPTI-HPTC,Nangal

2. PRE CHECKS
Intake gates +
butterfly valves
open + no alarm
syn. Selector
switch off
syn. Test switch
off
GE MCB ok
speed signal ok
guide vane
position
signal(DTL) ok
EL. GOV. ready
for start
Excitation and
AVR ready for
start
rapid shut down
1 ok
rapid shut down
2 ok
emergency shut
down ok
auxiliaries on
remote
unit at stand still
no
RSD1/RSD2/ESD
over speed

3. PRE CHECKS
MIV BYP.V.1
+2 pos. ok
MIV AIR.V.
valve. pos. ok
MIV service
seal pos. ok
MIV maint.
Seal pos ok
accum.
GMC 415v ac
supply ok
GMC 48v dc
supply ok
piston accum.
Level ok
accum.
Pressure not
high
accum.
Pressure not
low
nitrogen
pressure ok
gen. rotor not
lifted
brake CUB.S .
SW on AIR

4. PRE CHECKS
T/F – R ac
power supply
ok
T/F –Y ac
power supply
ok
T/F – B ac
power supply
ok
420 Kv bus A
420Kv gen. CB
open
420 Kv bus A
or bus B isol.
Close
draft tube
gate open ok
415V feeder
to UAB-1 close
no antivalence
no reset PB
glowing

5. STARTING SEQUENCE
STEP-1
SHAFT SEAL FLUSHING WATER ON
COLLING WATER SYSTEM ON
HP OIL SYSTEM ON
REMOVE BRAKES
OIL VAPOUR EXTRACTOR ON
GOVERNOR HYDRUALIC ON
TRANSFORMER OIL ON
SPACE HEATER OFF

6. STEP-2
SHAFT
STANDSTILL
SEAL OPEN
MIVMIV
SERVICE
SEAL ON
MAIN INLET
VALVE-OPEN

7. STEP-3
DTL START
GUIDE VAINE OPEINING
POSITION 10%POSITION 10%
SPEED WILL RISE is >
90%
INSERT SETPOINT 50 HZ

8. STEP-4
ACHIEVE SPEED 95% of
Rated Speed
EXCITATION SYSTEM ON
AVR ONAVR ON
ACHIEVE RATED VOLTAGE
11KV/15.75KV
SHAFT SEAL FLUSHING
WATER OFF
HP OIL SYSTEM OFF

9. STEP-5
SYNCHRONO SCOPE
SWITCH
AUTO/MANUAL
MATCH THE VOLATAGEMATCH THE VOLATAGE
AND FREQUENCY WITH
GRID
CIRCUIT BREAKER ON

10. STEP-6
CHANGE
AUX ON
MACHINEMACHINE
INCREASE
THE LOAD

11. STOPING SEQUENCE
STEP-1
Decrease
Load
Command
“DTL
Stop”

12. STEP-2
Command “420
kV CB Trip
Command “
Exc. Off”Exc. Off”
Change Aux on
Remote
Check speed is
less then 90%

13. STEP-3
Command” HP Oil Pump
On”
Command “ Shaft Seal
Flushing Water On”
Command “MIV Close”
Command, MIV Service Seal ON”
Check if the speed is < 20%; the Shaft Seal
Fl.Water and the HP Pump is on.Then:

14. STEP-4
Command “Brake Dust
Coil. On
Command “Gen
Brakes On”
Check if the unit is at
standstill (the lamp
“Standstill is not more
flashing).

15. STEP-5
Command “Shaft St.Seal
On “
Command “HP Oil Pump
Off”
Command “ Oil VapourCommand “ Oil Vapour
Extr.Off”
Command “Gen.Space
Heater On”
Command “Transf. Oil
Pumps Off”
Command “Govt.
Hydr.Aux. Off”

16. STEP-6
(1 Minute after
Standstill)
Command “Brakes
Dust Coll. Off”Dust Coll. Off”
Command “Shaft Seal
Flushing Off”
Command “Cool.Water
System Off”

17. Thanks