kapil sahani
TRANSCRIPT
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Presented By :
Kapil Sahani
10EGIEE029
Presented to :Mr. Shakti Singh Shekhawat
Head of the Department
Electrical Engineering
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Session: 2012-13
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Abstract
A practical training in Grid Sub-Station helps in getting
acquainted with the way in which our knowledge is
being practically used outside the institute and this is
normally different from what we have learnt from
books theoretically.
220 GRID SUB STATION,DEBARI is one of 220 KV
capacity gss among which those are connected in this
ring.
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Introduction
Single Line Diagram Power Transformer
Instrument Transformer
Circuit Bracker
Insulators Lightning Arrester
Isolators
PLCC
Battery Section
Capacitor Bank
Conclusion
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Introduction
220 KV GSS, DEBARI, UDAIPUR IS A GRID OF RAJASTHANRAJYA VIDHYUT PRASARAN NIGAM LTD (RRVPNL) .
Main supplier of electricity in Udaipur district, Banswara,
Dungarpur & part of Rajsamand.
At present Total grid capacity is 300 MVA.
After installation of new X’mer capacity will be 460 MVA.
Total normal load is about 160 to 170 MW .
peak load is 250 MW. Maximum load is of HZL, Debari,which is 36 MW
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Single Line Diagram
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For incoming lines GSS (220
KV)
Outgoing lines in GSS (132 KV) Outgoing lines in GSS (33
KV)
1. RAPP A 1. HZL 1. CEMENT FACTORY
2. RAPP B 2. SUKHER 2. RIICO
3. CHITTORGARH (I/C & O/G both) 3. MADRI 3. BHUWANA
4. BANSWARA (I/C & O/G both) 4. NATHDWARA 4. PRATAP NAGAR
5. KANKROLI (PGCIL) 5. MAVLI 5. BICHADI
6. BHATEWAR 6.BHATEWAR
7. UCW
INCOMING AND OUTGOING LINE
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POWER TRANSFORMER
static device by means of which electric power in one circuit
is transformed into electric power of the same frequency inanother circuit
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TRANSFORMER EQUIPMENTS
9
CONSERVATO
R
BUCHHOLTZ
RELAYBUSHINGS
BREATHER
TRANSFORMER
TANK
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Transformer Tank
10
whole assembly of atransformer is placed in a
metal sheet tank
assembly of the transformer
is immersed in an oil whichact as an insulator as well as
coolant.
The oil will take out the heat
produced by thetransformer windings and
core
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Conservator
11
A cylindrical shaped air tightmetal drum placed on a
transformer tank
It provide cooling to transformer
It provide insulation between
transformer windings.
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Breather
12
apparatus with whichbreathing of the transformer
takes place
Oil is used to trap the dust
particles , during contraction
of oil & suction of outside air
to inside of transformer
SILICA GEL
(DRY)
OIL
A Breather
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Buchholz relay
13
It gives an alarm to the operator
if there is any fault in transformer
If fault continues to persist , thenthe relay will trip the main circuitbreaker to protect thetransformer
It works during:
Short-circuited core laminations
Broken-down core bolt insulation
Bad contacts
Overheating of some part of the
windings Short-circuits between phases
Earth faults puncture of bushinginsulators inside tank
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Cooling of transformer
14
1. Air natural (AN)
2. Air Blast(AB)
3. Oil Natural (ON)
4. Oil natural air forced (ONAF)
5. Oil natural water forced
(ONWF) 6. Forced circulation of oil
Oil forced air natural(OFAN)
Oil forced air forced(OFAF) Oil forced water
forced(OFWF) ONAF cooling provided to 220/33kV
transformer
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Radiator Radiator are used in
transformers to cool the
transformer oil
ON & ONAF is used for cooling
It has small fins
4 – 10 radiator banks in a
transformer depending upon
capacity
Radiator
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SPECIFICATION
220/132 KV TRANSFORMER MAKE
160 MVA X’mer -1 Nos. IMP POWER LIMITED -1
100 MVA X’mer -2 Nos. CROMPTION -1
TELK
50 MVA X’mer -2 Nos. CANADIAN GENERAL ELECTRIC – 1
BHEL-1
220/132 KV TRANSFORMER MAKE
14.6/20 MVA X’mer S-I NGEF
16/20 MVA X’mer S-II NGEF
10/12.5 MVA X’mer S-III NGEF
Five step down transformers are used to step down 220kv into 132kv.
Two step down transformer are used to step down 132 kv into 33kv
Total transformer installed - 8
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INSTRUMENT TRANSFORMER
Current Transformer
Potential Transformer
Transformer used in conjunction with measuring instrumentsfor measurements purposes
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CURRENT
TRANSFORMER
used for measurement of electric
currents.
CT produces a reduced current
accurately proportional to the current
in the circuit
isolates the measuring instrument
from high voltage circuit.
used in metering and protectiverelays.
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POTENTIAL
TRANSFORMER
Are used to step down the voltage
for:
Measurement
Protection
Control
Allows protective relay equipment
and measuring instruments to be
operated at a lower voltages.
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Circuit Braker
An automatically operated switch
Break a circuit automaticcally
under fault condition
protect an electrical circuit from
overload and short circuit
It is an on – load device
Classified as:
•OiL circuit breaker
•Air blast voltage circuit breaker
•SF6 circuit braker
•Vacuum circuit braker
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Classification of circuit braker
Oil circuit breaker: -
Uses some insulating oil for arc extinction.
Air blast circuit breaker
:-
High pressure air blast is used for extinguishing the
arc.
Sulphur hexafluoride circuit breaker:-
SF6 gas is used for arc extinction.
Vacuum circuit breaker:-
Vacuum is used for arc extinction
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InsulatorsInsulators is used to hold the live conductor and to prevent leakage of the current
from the conductor to the pole.
1.Pin type Insulators 3. Strain Insulators
4. Shackle Insulators 5. Stay Insulators
2. Suspension Insulators
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Lightning arrester
To protect transformer from over voltage caused
by lightning.
On the occurrence of over voltage, the air
insulation across the gap breaks down an arc is
formed, providing a low resistance path for thesurge to the ground
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Isolators
used to completely de-energise the
circuit for service or maintenance
used for a isolating a circuit under no
load condition only.
have provisions for a padlock
an isolator is an off-load device .
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Battery house:-
DC power supply is required for the
operation of circuit breaker and as a supply
for PLCC room and also for control room
indication.
Battery charger
It is used for charging purpose of battery
house, which is based on semiconductor
devices.
Battery section
26
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The capacitor gives following functions
1. Voltage Rise
2. Energy storage
3. Power Factor Improvement
Two capacitor banks of 7.2 MVAR are used for
power factor and voltage improvement.
Capacitor bank
27
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