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3. GENERATOR STATOR WATER COOLING SYSTEM-STAGE DESCRIPTION AND OPERATION 3.1 INTRODUCTION INTRODUCTION
One of the ecient ways of taking away the losses from the win
any electrical machines is by direct cooling using water. The optimum d large large capaci capacity ty turbo turbo genera generator tor,, as a rule rule envisa envisages ges water water-co -cooli oling ng
windings. The 200! " 2#0! " 2$%! Turbo generators employ a clo
circulation of high &uality demineralised water through the stator winding of hollow and solid conductors. The generator is capable of delivering its rated load only when
water water-co -cooli oling ng system system is functi functioni oning ng prope properly rly. Ther Therefor efore it is necess necess high highes estt atten attenti tion on is paid paid for for prop proper er oper operat atio ion n and main mainte tena nanc nce e e&uipments in this system. This section deals with the principles of working, constructional
and the operation and maintenance procedures of various elements o water-cooling system.
This manual is prepared prepared keeping in mind that the operating person
the necessary basic knowledge of the e&uipment. Though in this manua been been atte attemp mpte ted d to deal deal with with all all the the impo import rtan antt aspe aspect cts s of oper oper
maintenance, it should be kept in mind that the 'nal responsibility for o
the unit lies with the operating company personnel and it is advisable to
()*+ whenever necessary. ()*+ reserves the right to change or modi
instructions, in part or full, at a later date, based on the eperience ga Sign up to vote on this title similar units in course of time. Useful Not useful
3.2 GENERAL DESCRIPTION
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echanical 'lters 2 #00 3 duty
agnetic 'lter # #00 3 duty
Other components employed in the system are gas trap device, e tank, water 6et e6ector, valves and associated instrumentation. Together
connecting pipe work these components form the eternal circuit for th
of cooling water to generator windings. 7efer stator water system diagr cooling circuit makes use of either of the following water supplies, oygen. /a istilled !ater. /b 8ully demineralised water from boiler feed water treatment plant. /c ondensate.
8ully demineralised water from the boiler feed water treatment p
condensate may only be used if no chemicals, such as ammonia, hy phosphates etc. are present in the water or condensate. : part of
bypassed, and is treated in mied bed ion echanger, connected in parall You're Reading a Preview
stator winding, magnetic 'lter and epansion tank and returned into suc Unlock full access with a free trial.
of the water pump, thus maintaining conductivity of closed loop circulatin
With Free Trial within permissible limit. The Download water pumps are of single stage type wi
casing and overhung impeller. The pump is connected to a three phase :
8ailure of the working pump due to fault or power supply failure resu
automatic changeover to standby pump; the criterion for such a chang
the falling water pressures downstream the pumps. This falling pressure i Sign up to vote on this title
by means of a pressure switch. The heat absorbed by the wate Useful Not useful generator is dissipated to the secondary coolant in the primary water coo
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ions from the cation echanger and hydroyl ions from the anion echa
the water at the same time. This echange can only take place b
e&ually charged ions. Therefore, cation echanger echange cation an
echanger echange anion. This process takes place within a very sh while the water is passed through the ion echanger. : combination
acidic cation echanger and highly basic anion echanger constitutes a m of small deminerali9ation units, resulting in a high purity deionite.
The mechanical 'lter eliminates any foreign particles in the wate may choke, erode the hollow conductors. i=erence of pressure at
outlet of the 'lter is indicative of the degree of choking. The choked 'lter cleaned after using the standby without a=ecting the system co
magnetic 'lter prevents any magnetic particles from entering the genera
accidental leakage of hydrogen into the main distilled water stream is d
by gas trap device /see description of gas trap device. The water from th of stator winding collects in an overhead epansion tank, which pr
constant level of water during normal running of the system. The ho You're Reading a Preview
enters the tank through perforated pipe in the form of spray thus relea Unlock full access with a free trial.
entrapped gas. : water 6et e6ector is connected to epansion tank for
Download With Trial of Oygen")ydrogen >a vacuum for the purpose of removing anyFree traces
may be present as a result of hydrogen leakage into the water strea
signaling device provided in the epansion tank monitors the high and l
of distilled water and initiates a tripping command for stator water pum level in the epansion tank. ake up water to the system is pro Sign up to vote on this title
epansion tank through a ?oat operated level regulator. Useful Not useful The &uantity of water ?owing through the windings is measu st
of
i'
plat
?o
tr
sd
d ?o
indi
to
and
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temperatures and pressures at various points of the system. 4ressure inte of the pumps is also provided.
3.3 STATOR WATER PUMP DESCRIPTION 01. DESIGN FEATURE @tator water for cooling the stator winding is circulated in a closed ensure the continuous generator operation, without any interruptio capacity pumps are provided. The pumps have e&ual priority
alternatively brought into operation, a changeover being possible at a without interruption. The standby pump is kept ready for servic
automatically started in the event of the failure of stator water supply
results in fall of the pressure below the set value in pressure switch ins
the circuit. @tator water pumps are of single stage centrifugal type wi casing and overhung impeller. The pumps suction is arranged in
direction, while the discharge is directed radially upward. The spiral casin
pump is 6oined to the bearing housing through a ?ange. The pump impe
the spiral are of the stainless steel construction. The point casing is se You're Reading a Preview
means of mechanical seals. The pump shaft is supported in oil Unlock full access with a free trial.
antifriction bearing. The pump is connected to a $ phase A#% Bolt :.. mo
coupling covered by the coupling guard Download With spacer. Free Trial Cormally the pump-mot installed at the 9ero meter level of the power station.
3.4 WATER COOLER DESCRIPTION
The stator water cooler is shell and tube type heat echanger sui
vertical mounting, in which the .. water ?ows through the shell. @hell Sign up to vote on this title
of non-magnetic stainless steel. ooling water ?ows through the tubes. T Useful Not useful made of stainless steel. The general arrangement of the cooler al di=
9le
tio
is sho
in the dia
hav
e=e
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/ii
One thermometer each at inlet and outlet of secondary coo water to measure the inlet and outlet temperature.
3.5 STATOR WATER FILTER DESCRIPTION
The 'lter consists of cylindrical body having separate inlet an
chambers. :n assembly of A% 'lter elements surrounds a perforated cy body having holes all along its length and periphery. The 'lter elements in position by helical spring, which is kept pressed by the cover. elements consist of sound corrugated brass sheet with a central hole
si9es of wire mesh aperture, 0.22A mm and 0.% mm held in one assembl inner and outer brass rings. The material of construction of body, co
perforated cylinder is stainless steel whereas that of 'ltering element i
The water enters the 'lters as shown in the drawing. The wa
passing through the 'ltering elements enters the perforated cylinder from
it ?ows to the outlet chamber. echanical impurities get collected on t
meshes as the li&uid passes through the mesh holes from the inlet cha
the delivery chamber through the perforated cylinder. The 'lter is provid You're Reading a Preview
vent and drain plugs.
The normal pressure drop, across the 'lter corr Unlock full access with a free trial.
to the rated ?ow is of the order of 0.# E 0.2 kg"m 2 /g. :s the parti
Download With Free Trial deposited on the wire meshes, the resistance to ?ow increases and conse
pressure drop across the water 'lter increases. !hen the pressure drop in to 0.A kg"m2 /gauge cleaning is recommended.
3.6 TECHNICAL PARTICULARS #. Type 2. 7ated discharge $. aimum pressure rating
1 !ire mesh isc T
Sign up to vote on this title
Useful
$ 1 $0Notuseful "hr.
1 #2 kg"m2
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1 $H kg"m 2 /> for #% minutes.
##.)ydraulic test pressure
3.7 MAGNETIC FILTER DESCRIPTION The magnetic 'lter is of permanent magnet type designed
ferromagnetic /strong and average magnetic particles, if present in th
system. The capacity of the magnetic 'lter is $F $"hr. aimum str
magnetic 'eld in the circular air gap is of the order of A000 gauss. T mainly consists of an upper and a lower body, housing the permanent
system, comprising of the magnets, pole shoes and pole ring as show
'gure. The demineralised water before entering the winding passes thro
magnetic 'lter, where it successively passes through two annular air
which ferromagnetic particles are 'ltered out because the later are attr
the pole shoes and pole ring points in the 9one of high magnetic 'eld s The 'lter is installed to the vertical position and is connected corresponding piping ?anges by means of bolts.
3.8 TECHNICAL PARTICULARS #.
agnetic 'lter type
You're Reading a Preview 1 KL E $F
2.
agnet type
Unlock full access with a free trial. 1 4ermanent
$.
aimum induction density
1 A000 >auss
A.
apacity
1 $F $"hr.
%.
!eight
1 ##$ kg
F.
4ressure rating /kg"m2
G.
Type of particles which can be 'ltered
H.
)ydraulic test pressure
I.
4ressure drop
magnet
Download With Free Trial
1 Cot more than # 1 )ighly M medium mag
2 Sign up tokg"m vote on this title#0 minute 1 #F for
Useful Not useful 1 Cegligible
3. E!PANSION TAN" DESCRIPTION
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which opens or closes depending on the level in the tank. The stator wat
draws water from the bottom of the tank for recirculation. The tank is p with the following instruments"components. /i
: gauge glass to indicate the level of the water in the tank.
/ii
Two nos. of transducers for level signalling device to give hig low level alarm signals.
/iii
: vacuum gauge level regulator vacuum inside the tank.
/iv
: ?oat operated level regulator to regulate the make up water.
/v
: drain valve to facilitate draining of the complete tank in cas necessary.
3.10 #ACUUM PUMP DESCRIPTION
+i&uid 7ing Bacuum 4ump is used to create vacuum in epansion
also builds up vacuum in stator water-cooling system during starting. Th
consists of a N@):8T mounted multibladed impeller located eccentrical
N@T:TO7. 4rocess gas is sucked through in the N
N compressed in stator and epelled through a g You're Reading a Preview
NO5T+*T OCT7O+ <@ into the NO5T+*T 454 :@ to the atmo Unlock full access with a free trial.
@ervice li&uid is inserted into the pump by means of a control value p
Downloadmounted With Free Trial ue to rotation of the eccentrically multibladed impeller, servi
is thrown towards the periphery of the stator thus forming a sealant. 4ro
is trapped in the space between the impeller blades, compressed and e
Thus a continuous suction cycle is initiated. The service li&uid functio sealant as well as coolant.
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3.11 TECHNICAL DATA 01. MATERIAL OF CONSTRUCTION
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SER#ICE LI*UID CONNECTION COUPLING
% %
SER#ICE LI*UID USED
QP (@4
8+*<(+* %
H +4 :T #0 4sig
0.2 PUMP DETAILS MODEL
%
2T E $0
#ACUUM
%
G20 mm )g ol. /a.
DISPLACEMENT
%
%# $")7
R.P.M
%
SEALANT RE*D.
%
$)4 :T A#%B $L %0 "@
H +4
03. MOTOR DETAILS MA"E
%
TYPE
%
H.P.
%
R.P.M
T*8 @S5<77*+ :>* $ %
#OLTAGE
%
():7:T (
2H%0
A#% BO+T@
3.12 POLISHING UNIT You're DESCRIPTION Reading a Preview
The polishing unit serves maintain low electrical conductivit Unlock to full access with a freeatrial.
the primary water. The water treatment system is connected in paralle Download With Free Trial
the main circuit and contains a mied-bed ion echanger with connected
'ne
'lter,
an
integrating ?ow meter and a
condu
transmitter.
3.13 MI!ED-&ED ION E!CHANGER
vote on this title The mied-bed ion echanger consists Sign of up a to tank 'lled with anion Useful Not useful upper cation echanger resins. Co99le trays in the and lower part of h
echanger tank prevent the escape of the resins into the piping system
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The polymer in the cation echanger contains highly acid groups, while polymer in the anion echanger is composed of highly basic groups.
echanger resins are thus capable of accepting ions from the primary wa
while simultaneously releasing e&uivalent amounts of other ions /hydro
ions from the cation echanger and hydroyl ions from the anion echan
to the primary water. This process takes place within a very short time w
the primary water is passed through the ion echanger. The combinatio
highly acid cation echangers and highly basic cation echangers form
multitude of small deminerali9ation units, resulting in a high-purity de-ion
The number of ions it can echange limits the capacity of the mied-be the ion echange. This capacity is primarily determined by the typ
echanger used, but also depends on the &uantity of reactivating agent, rate of ?ow and the water temperature. !hen the resins are ehausted,
resins must replace them. :fter removal from the primary water treatm system, the resins can be reactivated.
3.15 SUPER#ISION OF STATOR WATER COOLING SYSTEM You're Reading a Preview
The most essential measuring and supervisory devices in the prima Unlock full access with a free trial.
water supply system are1 Download With Free Trial device /#@peci'c 7esistivity " onductivity measuring
/2+evel meter evice /$8low measuring device /A4ressure gauges"4ressure switches. /%Temperature detectors and
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3.16 SPECIFIC RESISTI#ITY'CONDUCTI#ITY Not useful Useful MEASURING DE#ICE%
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3.17 LE#EL METER DE#ICE%
: level-signalling device senses the water level in the epansion ta
with a high or low water level initiating an alarm. : local water level gaug arranged in parallel to the electrical meter system.
3.18 FLOW MEASURING SYSTEM% The amount of water ?owing through the stator winding is measur by ?ow measuring system.
3.1 PRESSURE GAUGE'PRESSURE SWITCHES%
4ressures are sensed at the following measuring points in the stator water-cooling circuit. /#4ressure downstream of stator water pump N:. /24ressure downstream of stator water pumps N(. /$4ressure before and after water 'lters.
/A4ressure switches and pressure gauge at the inlet of stator winding. /%4ressure gauge at the outlet of stator winding. You're Reading a Preview /FBacuum pressure gauge at the epansion tank. Unlock full access with a free trial. 3.20 TEMPERATURE DETECTORS'INDICATORS OR
RECORDER%
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The following temperatures are measured locally by means of thermometers. /a Temperature of inlet and outlet of water coolers
/bTemperature of the water at the inlet and outlet of stator winding w alarm contacts.
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Useful Not useful /c 7esistance thermometers at the inlet and outlet of the stator windin
These resistance thermometers are connected to the indicators
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3.22 GENERAL DESCRIPTION The control cabinets are freestanding sheet steel enclosures; dust
vermin proof, provided with mesh covered louvers on front and rear doors natural ventilation. The control panels are provided with1
*arthing point.
:de&uate terminal station to facilitate interconnections /eternal.
7emovable bottom cover which can be suitably drilled for 'ing of cable glands and pipe entry.
+ockable servicing door/s.
+ifting arrangement through eye bolts at the top.
3.23 E*UIPMENTS MOUNTED IN CONTROL CA&INETS The following components are mounted in the stator water-cooling systems signalling cabinet1
onductivity measuring indicators.
8low indicator.
:udio-visual annunciation system e&uipment.
ultiplier relays, control devices etc.
4ower supply units.
:larm units.
+evel switches.
.O.+ starter and control e&uipments for both working and standby
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pump motors.
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3.24 GAS TRAP DE#ICE DESCRIPTION Useful Not useful
>as trap device is used for detecting the presence of hydrogen ga
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drainpipe consists of a plug /%, which has a central hole and a slot, w
connects the space at the upper chamber. The hole at the centre in the p
faces a small hole in the drainpipe, which is having small loop at the bott
The loop remains 'lled with water during normal operation thus isolating atmospheric gases"air from the upper chamber. The cylinder is ke
position by four bolts /G between upper and lower covers. Two samp
points are provided along with valves in the upper chamber of cylinder gas sampling.
--------------- ------------
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