Sub Station Abstract -(Part-2)
August 18, 2013 10 Comments
Sub Station Capacity & Short Circuit Current Capacity:
|
As per GERC |
||
| Voltage | Sub Station Capacity | Short Circuit Current |
| 400 KV | Up to 1000 MVA | 40 KA (1 to 3 Sec) |
| 220 KV | Up to 320 MVA | 40 KA (1 to 3 Sec) |
| 132 KV | Up to 150 MVA | 32 KA (1 to 3 Sec) |
| 66 KV | Up to 80 MVA | 25 KA (1 to 3 Sec) |
| 33 KV | 1.5 MVA to 5 MVA | 35 KA (Urban) (1 to 3 Sec) |
| 11 KV | 150 KVA to 1.5 MVA | 25 KA (Rural) (1 to 3 Sec) |
| 415 V | 6 KVA to 150 KVA | 10 KA (1 to 3 Sec) |
| 220 V | Up to 6 KVA | 6 KA (1 to 3 Sec) |
Sub Station Capacity & Short Circuit Current Capacity:
|
As per Central Electricity Authority |
||
| Voltage | Sub Station Capacity | Short Circuit Current |
| 765 KV |
4500 MVA |
31.5 KA for 1 Sec |
| 400 KV |
1500 MVA |
31.5 KA for 1 Sec |
| 220 KV |
500 MVA |
40 KA for 1 Sec |
| 110/132 KV |
150 MVA |
40 KA or 50 KA for 1 Sec |
| 66 KV |
75 MVA |
40 KA or 50 KA for 1 Sec |
Minimum Ground Clearance and Fault Clearing Time:
| Voltage | Min. Ground Clearance | Fault Clear Time |
| 400 KV | 8.8 Meter | 100 mille second |
| 220 KV | 8.0 Meter | 120 mille second |
| 132 KV | 6.1 Meter | 160 mille second |
| 66 KV | 5.1 Meter | 300 mille second |
| 33 KV | 3.7 Meter | |
| 11 KV | 2.7 Meter |
Bus bar Ampere Rating:
| For Phase Bus bar | Aluminium 130 Amp / Sq.cm or 800Amp / Sq.inch. |
| For Phase Bus bar | Copper 160 Amp / Sq.cm or 1000Amp / Sq.inch |
| For Neutral Bus bar | Same as Phase Bus bar up to 200 Amp than Size of Neutral Bus bar is at least half of Phase Bus bar. |
Bus bar Spacing:
| Between Phase and Earth | 26mm (Min) |
| Between Phase and Phase | 32mm (Min) |
| Bus bar Support between Two Insulator | 250mm. |
Sound Level of Diesel Generator (ANSI 89.2&NEMA 51.20):
|
KVA |
Max. Sound Level |
| <9 KVA | 40 DB |
| 10 KVA to 50 KVA | 45 DB |
| 51 KVA to 150 KVA | 50 DB |
| 151 KVA to 300 KVA | 55 DB |
| 301 KVA to 500 KVA | 60 DB |
IR Value of Transformer:
|
IR Value of Transformer |
|||
| Voltage |
30°C |
40°C |
50°C |
| >66KV |
600MΩ |
300MΩ |
150MΩ |
| 22KV to 33KV |
500MΩ |
250MΩ |
125MΩ |
| 6.6KV to 11KV |
400MΩ |
200MΩ |
100MΩ |
| <6.6KV |
200MΩ |
100MΩ |
50MΩ |
| 415V |
100MΩ |
50MΩ |
20MΩ |
JIGNESH PARMAR
Thanks
Dear Jigneshbhai,,
Can you please guide me about the installation of Air terminal/Lightning arrester on the water tank roof…?
Actually i am in little confusion in that because there is also internal cathodic protection for the tank. and if we directly fix that airterminal on tank roof without isolate it with the tank body/roof,then it will be affect to the internal cathodic protection of tank or not. Even though tank shell will be connected to the earthing also.
Maulesh
+966-505995740
Very good information.
Good work keep it up
which standard you have taken here?
how and why power factor improvement in electrical circute i want information in hindi language
just copy article and past it on Google translator .!!!!!
HI sir,
I am having some doubts in measuring Insulation resistance.
DOUBT 1:
What is the difference between Measuring Insulation Resistance of a Motor/Generator using Megger and using Multimeter.
Where to use Multimeter and where to use megger
DOUBT 2:
For what applications we have to use star connected Motor (PERMANENTLY IN STAR) and where to use Delta connected Motor (PERMANENTLY IN DELTA)
DOUBT 3:
This is about Pneumatics……….. in what way 4/2 valve is different from 5/2 valve i know a difference between them is 5/2 valve has one additional exhaust port. But both working Principles is same. is there is any other difference between these.
want to know about XLPE HT and LT.
maximum distance of ACSR can be used in LV line. Thumb rule for LV distribution ..
why in every state or location has different Electrical Code?
NEC
and also in every country has an electrical standard?
ex: USA and UK