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Images of stator frames constructed in BHEL
Outer Stator part
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| Stator Frame |
Ø In this part we brought the images of stator frame, or Images of stator Body, Stator part where windings are being placed .
Outer cover
 |
| Outer cover of statorØABOUT |
ØAbout
Ø The outer casing is of gas-tight and pressure resistant welded construction.
Stator cover
 |
| Staror cover |
Stator Frame
 |
| Stator Frame |
ØThe frame is made up of a non magnetic material to prevent the eddy current losses.
CONSTRUCTIONAL FEATURES OF STATOR BODY
I) Stator Frame ‑
Stator
body is a totally enclosed gas tight fabricated structure made up of high
quality mild steel and austenitic steel. It is suitably ribbed with annular
rings in inner walls to ensure high rigidity and strength .The arrangement,
location and shape of inner walls is determined by the cooling circuit for the
flow of the gas and required mechanical strength and stiffness. The natural
frequency of the stator body is well away from any of exiting frequencies.
Inner and sidewalls are suitably blanked to house for longitudinal hydrogen gas
coolers inside the stator body.
2)
Pipe Connection
‑
To attain
a good aesthetic look, the water connection to gas cooler is done by routing
stainless steel pipes; inside the stator body; which emanates from bottom and
emerges out of the sidewalls.
These stainless steel pipes serve as inlet and outlet
for gas coolers.
From
sidewall these are connected to gas coolers by the means of eight U-tubes
outside the stator body. For filling the generator with hydrogen, a perforated
manifold is provided at the top inside the stator body.
3)
Terminal Box ‑
The
bearings and end of three phases of stator winding are brought out to the
slip-ring end of the stator body through 9 terminals brushing in the terminal
box. The terminal box is a welded construction of (nonmagnetic) austenitic
steel plates. This material eliminates stray losses due to eddy currents, which
may results in excessive heating.
4)
Testing Of
Stator Body ‑
On
completion of manufacture of stator body, it is subjected to a hydraulic
pressure of 8 kg/cm for 30 minutes for ensuring that it will be capable of
withstanding all expansion pressure, which might arise on account of hydrogen
air mixture explosion. Complete stator body is then subjected to gas tightness
test by filling in compressed air.
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