Power system in vsp
POWER REQUIREMENTAverage Load : 240 MW / 266 MVAPeak Load : 275
MW / 305 MVA
SOURCES OF POWERCAPTIVE POWER PLANT
STATE ELECTRICITY GRID
DIESEL GENERATORS
VISAKHAPATNAM STEEL PLANT CAPTIVE POWER GENERATION
Thermal Power : 3x60 + 1x67.5MWBackpressure Turbine Gen
2x7.5MWGas Expn. Turbine Gen 2x12 MWTotal Gen. Capacity: 286.5
MW
DISTRIBUTION NETWORK(DNW)Its role is to supply reliable &
quality power to all the sections in the plant
ACTIVITIES TAKEN BY THIS DEPARTMENT:
Operate, Inspect & Maintain EHT & HT Equipment of MRS,
LBSS1, LBSS2, LBSS3, LBSS 4 & CPRS.Maintain all HT Power
Distribution Equipment of other Sub Stations.Analyze the Breakdowns
and take necessary Corrective & Preventive steps to avoid
recurrence. Monitor Specific Energy Consumption of Major Shops.
SECTIONS OF DNWMain receiving station (MRS)Load block step-down
substation-1 (LBSS-1)Load block step-down substation-2 (LBSS-2)Load
block step-down substation-3 (LBSS-3)Load block step-down
substation-4 (LBSS-4)Load block step-down substation-6 (LBSS-6)Load
block step-down substation-7 (LBSS-7)
POWER REQUIRMENT OF INDIVIDUAL SHOPS
CAPTIVE GENERATION in MW
220 kV TRANSMISSION LINES IN VSPMRSLBSS 3LBSS 4LBSS 2LBSS 1LBSS
58.3 KM1.6 KM2.1 KM3.4 KM1.1 KM70 MW50 MW10 MW50 MW70 MW
MAIN RECEIVING STATION This is a 220kV substation which receives
power from VSP SS of APTRANSCO and Captive Power Plant, TPP.
From here the power is distributed to various load block step
down substations such as LBSS-2, LBSS-3, LBSS-4 and LBSS-6. Also
supply power to township through CPRS (Construction Power Receiving
Station) by stepping down from 220kV to 33kV and then 33kV to 11kV
and further to 415V
Load Block Step down Substation 1(LBSS-1)a set of 220KV double
circuit lines have been taken to LBSS-1 from LBSS-5
Three 80MVA 220kV 3-winding power transformers
The voltage is stepped down to 11kV and 6.6 kV The transformers
are selected if one is failed other two will meet the loadAvg load
55-60 Mw
Load Block Step down Substation 2(LBSS-2)This 220kv substation
step down voltage to 33kV,11kVand 6.6kV level four Transformers: 3
Transformers 220/11/6.6kV 80MVA star/delta/delta 4th Transformer
220/33 kV 31.5MVA star/star used for ladder furnace in SMS Avg load
70-80MW
Load Block Step down Substation 3(LBSS-3)This 220kv substation
step down voltage to 33kV,11kVand 6.6kV level3 Transformers
220/11/11kV 80MVA star/delta/delta Avg load : 10MW
Load Block Step down Substation 4(LBSS-4)This 220kv substation
step down voltage to 33kV,11kVand 6.6kV level3 Transformers
220/11/11kV 80MVA star/delta/delta Avg load : 40MW
Load Block Step up Substation 5(LBSS-5)The LBSS-5 receives the
power at 11 KV level from TPP and is further steps up to 220 kV.5
transformers in LBSS-5: 4 two winding transformers 11/220 kV
star/delta 5th is 3 winding transformer of 11/11/220 kV
star/delta/delta. under the control of TPP but maintained by
DNW.
Load Block Step down Substation 6(LBSS-6)It receives power from
Main Receiving Station (MRS) through two 220 kV transmission lines3
transformers of rating 220 kV /11/11 kV star/delta/delta with a
capacity of 63 MVAAnother 3 transformers of rating 220 kV /33 kV
with a capacity of 110 MVA
Load Block Step down Substation 7(LBSS-7)It receives power from
LBSS-6 through 11 kV cables and GSB-4. It consists of four
transformers of rating 33 kV /11 kV with a capacity of 40 MVA. The
main loads that are connected to it are BF3, SMS-2, Mills pump
house etc.
Load Block Distribution Substation(LBDS)Electric power at 11/6.6
KV stepped down at above LBSS stations is distributed to smaller
Load Block Distribution Station (LBDS) located in each unit. 11 KV
motors (above 200 kW rating generally) are connected to LBDS. In
LBDS, transformers which convert power form 11 KV to 415 V and
distributed to low tension loads.
HIGH VOLTAGE DISTRIBUTIONTwo 220/33 kV Transformers installed at
MRS feed power to Township step down station (called as CPRS)
through 33 kV cablesHere the voltage is further stepped down to 11
KV by two nos. of 33/11 kV transformers11 KV overhead construction
power lines to township network6.6 KV supply is mostly used for
motors (of rating >200 and
