From the SelectedWorks of Radhey Shyam Meena
Winter July 12, 2012
SWITCH YARD OPERATION IN THERMAL
POWER PLANT(KaTPP Jhalawar Rajasthan)
RADHEY SHYAM MEENA, Er.
Available at: http://works.bepress.com/radhey_meena/5/
PHASE-I
• 600MW
• 600MW
PHASE-II
• 650MW
• 650MW
LOCATION
Nimoda, Undal,
Motipura,
Singharia and
Devri villages of
Tehsil
Jhalarapatan,
Distt. Jhalawar
LAND
The GOR has
alloted 842 bigha
Government land
and aquired 1388
bigha private
khatedari land for
the thermal project.
WATER
The state irrigation
department has
alloted 1200 mcft
water for the project
from proposed
Kalisindh dam
COAL
Ministry of coal,
Govt. of India
has alloted
‘Paras east and
Kanta basin ‘
coal blocks to
RVUN in
Chhatisgarh
state. under
joined venture
with M/s. Adani
Enterprises
KaTPP JHALAWAR,
22KV
1200MW
400KV BTAWDA
400KV
GT
GEN.
22
KV
GCB
22KV
400KV BTAWDA
GT
SWITCHY
ARD
GT
UT
22/11
KV
UAT
11/3.3
KV
C&I
3.3KV,
220V
ICT
400/
220
KV
220KV JWR
220KV
220KV JWR
.
BUS BAR
LIGHTING ARRESTER
CIRCUIT BREAKER
ISOLATOR
CURRENT TRANSFORMER
CAPCITIVE VOLTAGE TRANSFORMER
WAVE TRAPER
The whole switchyard is grounded with MAT Grounding.
In MAT grounding,5 Conductors are placed Horizontally & 8 Conductors are Placed
Vertically.
All Switchyard equipment are grounded by two Earthing Connection.
In switchyard grounding,32mm earthing conductor is used & 75/2 GI earth Sheet is used.
All switchyard are gravelled to make the tower footing resistance high.
BUSBAR SCHEME
GT feeder
Line feeder
2000A
2000A
IPS tube of minimum 4.5 inch size
IPS tube of minimum 4.5 inch size
GENERATOR BAY
17
Bus Sectionaliser
Bay.
Bus Coupler Bay
18
ST back charging Bay
CLEARANCES
19
LIGHTNING ARRESTORS
• These are equipments designed to protect
insulators of power lines and electrical
installations from lightening surges by diverting
the surge to earth and instantly restoring the
circuit insulation to its normal strength with
respect to earth.
CIRCUIT BREAKER
A circuit breaker is an automatically
operated electric switch designed to
protect an electrical circuit from
damage caused by overload or short
circuit.
Its basic function is to detect a fault
condition
and,
by
interrupting
continuity, to immediately discontinue
electrical flow.
Unlike a fuse, which operates once
and then has to be replaced, a circuit
breaker can be reset (either manually
or automatically) to resume normal
operation.
SYSTEM ISOLATORS
• 400KV, 2000A, 40KA for 3.0 sec isolators for GT, lines, ICT
bays shall be provided.
The Isolator used in this plant is of two types.
Single pole double break isolator.
Double pole single break isolator.
CURRENT TRANSFORMERS
When current in a circuit is too high to directly apply to measuring
instruments, a current transformer produces a reduced current
accurately proportional to the current in the circuit, which can be
conveniently connected to measuring and recording instruments
400KV oil filled live tank type hermetically sealed single phase
current transformers will be used.
Multi-ratio CT tapping shall be provided on the secondary side to
obtain different ratios in order to different ratios In order to permit
different ratios on each core, as desired.
C
V
T
capacitor voltage transformer (CVT) is a transformer used
to step down extra high voltage signals and provide a low
voltage signal, for measurement or to operate a protective
relay.
Nominal/highest system voltage
400/420 KV
Rated primary voltage
400 KV/1.732
Rated secondary voltage
110 V/1.732
• An electronic filtering device designed to exclude unwanted
signals or interference.
• It blocks the high frequency carrier waves (24 kHz to 500 kHz)
and let power waves (50 Hz - 60 Hz) to pass through. It is
basically an inductor of rating in milli henry.
• Purpose of ICT is simply interconnection between 400KV
and 220KV Switchyard.
• 315MVA,400/220/33 KV
ONAN ONAF ODAF
HV
189
252
315
LV
189
252
315
TV
63
84
109
400KV
220KV
JHALAWAR
BTAWADA
400KV
BTAWDA
220KV
KaTPP
SWITCHYARD
JHALAWAR
Interlocks
When Circuit breaker is ON, Isolator should not
operate.
When Isolator is CLOSE, Earth switch should be OPEN.
When Both the Bus are charged, Bus coupler should
not become CLOSE.
When DC supply if not available, alarm should be
raised.
When gas pressure inside the Breaker is reduced to
5Kg/cm2,the alarm should be raised.
When the oil pressure inside the current
transformer is low , then alarm should be raised.
When the Nitrogen gas pressure is low at the
Current Transformer , then alarm should be raised.
31
RADHEY SHYAM MEENA
Student Member Of
The Institute Of Engineering & Technology (IET)
International Electrotechnical Commission (IEC)
Institute Of Electrical & Electronics Engineers (IEEE)
The South African Institute Of Electrical Engineers(SAIEE)
Universal Association Of Computer & Electronica Engineers(UACEE)
Coordinator:-Disha Gyan Sanstha(Rural Education Devlopment Technology)