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Study Of 33/11 KV Substation And Power Distribution Under RG

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by

Gaurav Singh

on 18 August 2014

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Transcript of Study Of 33/11 KV Substation And Power Distribution Under RG

About RGGVY Scheme :
Rajiv Gandhi Grameen Vidyutikaran Yojana scheme was launched for rural electrification.
It provides Free of cost service connection to all families Below Poverty Lines.
It promises a minimum daily power supply of 6- 8 hours.
It includes Creation of atleast one 33/11 kV (or 66/11 kV) sub-station in each block.
It provides Installation of at least one distribution transformer in each village / habitation.
REC is a nodal agency for this scheme.

Components Of 33/11 Kv Substation
1. Power Transformer :


Rated MVA (ONAN rating) :

5 MVA


No. of Phases :

3

Cooling medium :
Insulating Oil


Type of tap changer :

Off load tap Changer

Range of tappings :

+5% to –5% in steps of 2.5% each on
HV winding


Impedance (5 MVA) :

7.15%

Winding material :

Copper

Type of cooling :

ONAN

2. Substation Transformer :
4. Isolators :
3. Vaccum Circuit Breaker
Single Line Diagram Of 33/11 KV Substation
Study Of 33/11 KV Substation And Power Distribution Under RGGVY Scheme
GAURAV SINGH
11. AB (arial bundled) Cables :
10. Fuse
Pole Assembly For 33 Kv & 11Kv Lines
Distribution Pole Assembly
8. Cables and jointing kits :
6. Lightning Arrester :
HG (horn gap) Fuse
Hook Arrengement For Conductors
• Rated kVA (ONAN rating) :

100 kVA

• No. of Phases :

3
• Cooling medium :

Insulating Oil
• Impedance :

4.5%

• Type of cooling :

ONAN
• Type of tap changer :

Off load tap Changer
• Range of tapings :

+5% to -5% in steps of 2.5% each on HV winding

• Rated Normal Current :

630A for 11 kV
• Rated Normal Current :

1250A for 33kV
• Interrupting Capacity :

25kA for 3 sec
• Break Time :

<80ms
• Closing Time :

<150ms

DBCR type isolators are used in 33/11 kv substation
5. Instrument Transformers :
current transformer
potential transformer
Nominal Discharge current :
10kA

Housing :
Porcelain/Polymer
7. Meters :
tri-vector meter
Ammeter
Voltmeter
9. Stay set :
Stay wire
Stay Insulator
Turn Buckle
Anchor rod & plate
Guy Grip with thimble


Cut Out Fuse
LT Connectors
Street Light Fitting
Capacitor Bank Assembly On 2 Pole Structure
Auto Recloser Assembly
Automatic Voltage Booster On 11KV Line
Guying Arrangement
Turning Arrangement Of Conductors
REFERENCES :
BOQ Passed By PGCIL
REC Disc
PGCIL Library
33/11 Kv Substation Manual
google images
Full transcript