Type of Battery = Ni - Cd
Nominal System Voltage (NSV) = 110 V DC
Highest System Voltage (HSV) = ### V DC
Lowest System Voltage (LSV) = 99 V DC
Voltage per cell during float Charging (VPC) = 1.45 V
Minimum Operating Temperature = 10 °C
End Cell Voltage = 1.14 V
2.0 Continous loads 2.1 33 kV System
Relay/Eqpt. Ref Continuous Load (CL in watts) I Cable
feeder:-1) GIS
Bay control unit REF542plus 40
2) Control panel
Alarm / Annunciator 2.7
Semaphore Indicator (1) 2.1
Multifunction meter 6
3) Relay panel
Trip circuit relay (4*7) SPER1C1 28
Receive repeat relay B74 1
Dir O/C SPAS348C3 10
Dir E/F REJ527 4
DC supply supervision relay REXSF1 2.6
Indication lamp 2
Total load 98.4
II 33/11kV Trafo.feeder:-1) GIS
Bay control unit REF542plus 40
2) Control panel
Alarm / Annunciator 4.8
Semaphore Indicator (1) 2.1
Multifunction meter 6
3) Relay panel
Differential relay RET316*4 20
O/C relay REJ525 5
LV REF relay SPAJ115C 4
LV SBEF relay REJ521 5
Trip circuit relay SPER1C1 28
DC supply supervision relay RXSF1 2.6
Indication lamp 2
Total load 119.5
III Bus section, riser and measuring panel :-1) GIS
Bay control unit REF542plus 40
2) Control panel
LARSEN & TOUBRO LIMITED
ECC Division - EDRC (Electrical)
PROJECT : 33/11kV GIS S/S - AL AIN Doc. No. : G1409--RL7370J552A PREPARED CHECKED APPROVED TITLE : BATTERY SIZING CALCULATIONS - TYPE B S/S SA AKS KR
(UMM GHAFA & MASAKIN)
Semaphore indicator 4.2
3) Relay panel
O/C & E/F relay REJ525 5
Trip circuit relay SPER1C1 28
DC supply supervision relay RXSF1 2.6
Indicating Lamp 2
Total load 91.6
IV Busbar protection panel
:-Busbar differential protection relayREB500 11
Indicating Lamps 4
Aux. relay 5
Total load 20
V Common alarm panel
:-Alarm / Annunciator 13
Total load 13
2.2 11 kV System
I 33/11kV Trafo.incomer
feeder:-Bay control unit REF542plus 24
Voltage supervision relay (2) 6 Trip circuit supervision relay 3 REF protection relay SPAJ 115C 6
Misc. 20
Total load 59
II Bus riser and measuring panel
:-Voltage supervision relay (2) 6
Total load 6
III Bus section panel
:-Bay control unit REF542plus 24
Voltage supervision relay (2) 6 Trip circuit supervision relay 3
Misc. 10
Total load 43
IV Station aux. Transformer panel
:-Bay control unit REF542plus 24
Voltage supervision relay (2) 4 Trip circuit supervision relay 3
Misc. 20
Total load 51
V Cable feeder panel
:-Bay control unit REF542plus 24
LARSEN & TOUBRO LIMITED
ECC Division - EDRC (Electrical)
PROJECT : 33/11kV GIS S/S - AL AIN Doc. No. : G1409--RL7370J552A PREPARED CHECKED APPROVED TITLE : BATTERY SIZING CALCULATIONS - TYPE B S/S SA AKS KR
(UMM GHAFA & MASAKIN)
Trip circuit supervision relay 3
Misc. 20
VI Bus interconnector panel
:-Bay control unit REF542plus 24
Misc. 10
Total load 34
VII Capacitor Bank panel
:-Bay control unit REF542plus 24
Voltage supervision relay (2) 4 Trip circuit supervision relay 3
Misc. 10
Total load 41
VIII Underfrequency Load shedding panel
:-Load shedding relay SPAF 340C3 60
Total load 60
2.3 DC System
Battery charger & DCDB
:-Auxiliary relay 5 Indicating lamp (3*2W) 6 Total load 11 2.4 Trafo. OLTC AVR relay 10 Indicating lamp (5*2W) 10 Total load 20 2.5 LVAC Panel
Stand by Earthfault Relay (2nos.) 10
Indicating lamp (3*2W) 6
Total load 16
LARSEN & TOUBRO LIMITED
ECC Division - EDRC (Electrical)
PROJECT : 33/11kV GIS S/S - AL AIN Doc. No. : G1409--RL7370J552A PREPARED CHECKED APPROVED TITLE : BATTERY SIZING CALCULATIONS - TYPE B S/S SA AKS KR
2.5 Continuous Load Summary
S. No Feeder Continuous No. of Total Load
Load per feeder feeders
(Watts) (Watts)
1 33 kV Cable Feeder 98.4 6 590.4
2 33/11 kV Trafo. Feeder 119.5 3 358.5
(33 kV side)
3 33 kV Bus section , riser 91.6 2 183.2
and measuring panel
4 Busbar protection panel 20 1 20
5 Common Alarm panel 13 1 13
6 33 kV trafo. feeder (11 kV side) 59 3 177
7 11 kV Bus riser and measuring panel 6 3 18
8 11 kV Bus section panel 43 2 86
9 Station aux. trafo panel 51 2 102
10 11 kV cable feeder 53 17 901
11 11 kV Bus interconnector panel 34 2 68
12 11 kV Capacitor bank panel 41 3 123
13 11kV Underfrequency load shedding panel 60 1 60
14 DC System (Battery, Battery 11 2 22
charger & DCDB)
15 Trafo OLTC 20 3 60
16 LVAC Panel 16 1 16
Total continuous load = 2798.1
Continuous load in Amperes = 2798.10
= 28.26
Momentary tripping load per 33kV CB = 250 Watts
Maximum No. of breakers in 33kV busbar protection Zone = 5
Momentary tripping load of one busbar protection zone = 1250 Watts Annunciation window load ( 2 Windows + 1 Hooter considered) = 50 Watts
Total Tripping load = 1300 Watts
LARSEN & TOUBRO LIMITED
ECC Division - EDRC (Electrical)
PROJECT : 33/11kV GIS S/S - AL AIN Doc. No. : G1409--RL7370J552A PREPARED CHECKED APPROVED TITLE : BATTERY SIZING CALCULATIONS - TYPE B S/S SA AKS KR
(UMM GHAFA & MASAKIN)
= 13.13 A
Tripping time = 1 sec
1. Since the operation of tripping relay and trip coil is serial, the maximum load among them (i.e trip coil load) is considered for calculation.
4.0 Momentary closing load
Momentary closing load per 33kV CB . = 250 Watts
= 2.53 A
One minute duration of this load is considered to account for closing operation of all breakers
5.0 CB closing spring Charging Load
CB Motor rating = 180 Watts
Max.no. of CBs in one 33kV bus section = 5
Total spring charging load = 900 Watts = 9.09
Spring Charging Duration = 30 Sec.
6.0 Disconnector closing spring Charging Load
Disconnector motor rating = 180 Watts
Max.no. of disconnectors in one 33kV bus section = 6
Total spring charging load = 1080 Watts = 10.91
Spring Charging Duration = 30 Sec.
7.0 Emergency Lighting Load = 1324 Watts = 13.37
8.0 Load Cycle
Duration Load description Load in Amperes
1 second CB Tripping load + Continuous load + Emergency lighting load 54.77
360 minutes Continuous load + Emergency lighting load 41.64
240 minutes Continuous load 28.26
1 minute Continuous load + CB Closing load 30.79
30 seconds Continuous load + CB closing Spring charging load 37.35
1 second Continuous load + CB Tripping load 41.39
1 minute Continuous load + CB Closing load 30.79
30 seconds Continuous load + CB closing Spring charging load 37.35
1 second Continuous load + CB Tripping load 41.39
DATE 21.04.2004
DATE 21.04.2004
DATE 21.04.2004
DATE 21.04.2004
Watts /99 A
A
A
A
DATE 21.04.2004
Calculation carried out at temp. ambient 22 deg.C minimum 21 deg. C maximum 23 deg. C
Period Load Changes in Load (A) End of Section (minute) Kt Factor (A)
Section 1 First 1 Period only - if A2>A1, go to section 2- No
1 A1 = 54.77 A1-0 = 54.77 M1 0.02 M1+0 0.02 0.52 1 28.48
TOTAL 28.48 Section 2 First 2 Periods only - if A3>A2, go to section 3- No
1 A1 54.77 A1-0 54.77 M1 0.02 M1+M2 360.02 6.26 1.00 342.85 2 A2 41.64 A2-A1 -13.13 M2 360.00 M2 360.00 6.26 1.00 -82.20
TOTAL 260.65 Section 3 First 3 Periods only - if A4>A3, go to section 4- Yes
Section 4 First 4 Periods only - if A5>A4, go to section 5- Yes Section 5 First 5 Periods only - if A6>A5, go to section 6- Yes Section6 First 5 Periods only - if A7>A6, go to section 7- No
1 A1 54.77 A1-0 54.77 M1 0.02 M1+M2+.. 601.54 10.32 1.00 565.21 2 A2 41.64 A2-A1 -13.13 M2 360.00 M2+M3+… 601.52 10.32 1.00 -135.52 3 A3 28.26 A3-A2 -13.37 M3 240.00 M3+M4+M… 241.52 4.57 1.00 -61.12 4 A4 30.79 A4-A3 2.53 M4 1.00 M4+M5+.. 1.52 0.98 1.00 2.47 5 A5 37.35 A5-A4 6.57 M5 0.50 M5+M6 0.52 0.81 1.00 5.32 6 A6 41.39 A6-A5 4.04 M6 0.02 M6 0.02 0.52 1.00 2.10 TOTAL 378.47 Section7 First 7 Periods only - if A8>A7, go to section 8- Yes
Section8 First 8 Periods only - if A9>A8, go to section9- Yes Section9 First 9 Periods only - if A10>A9, go to section10- No
1 A1 54.77 A1-0 54.77 M1 0.02 M1+M2+.. 603.06 10.35 1.00 566.86 2 A2 41.64 A2-A1 -13.13 M2 360.00 M2+M3+… 603.04 10.35 1.00 -135.91 3 A3 28.26 A3-A2 -13.37 M3 240.00 M3+M4+M… 243.04 4.59 1.00 -61.39 4 A4 30.79 A4-A3 2.53 M4 1.00 M4+M5+.. 3.04 1.11 1.00 2.80 5 A5 37.35 A4-A3 6.57 M5 0.50 M5+M6+.. 2.04 1.02 1.00 6.70 6 A6 41.39 A4-A3 4.04 M6 0.02 M6+M7+… 1.54 0.98 1.00 3.96 7 A7 30.79 A4-A3 -10.61 M7 1.00 M7+M8+.. 1.52 0.98 1.00 -10.39 8 A8 37.35 A4-A3 6.57 M8 0.50 M8+M9 0.52 0.81 1.00 5.32 9 A9 41.39 A4-A3 4.04 M9 0.02 M9 0.02 0.52 1.42 2.98 TOTAL 380.93 Section10 First 10 Periods only - if A11>A10, go to section 11- No
1 A1 54.77 A1-0 54.77 M1 0.02 M1+M2+.. 603.56 10.35 1.00 566.86 2 A2 41.64 A2-A1 -13.13 M2 360.00 M2+M3+… 603.54 10.35 1.00 -135.91 3 A3 28.26 A3-A2 -13.37 M3 240.00 M3+M4+M… 243.54 4.59 1.00 -61.39 4 A4 30.79 A4-A3 2.53 M4 1.00 M4+M5+.. 3.54 1.15 1.00 2.90 5 A5 37.35 A4-A3 6.57 M5 0.50 M5+M6+.. 2.54 1.06 1.00 6.96 6 A6 41.39 A4-A3 4.04 M6 0.02 M6+M7+… 2.04 1.02 1.00 4.12 7 A7 30.79 A4-A3 -10.61 M7 1.00 M7+M8+.. 2.02 1.02 1.00 -10.82 8 A8 37.35 A4-A3 6.57 M8 0.50 M8+M9+.. 1.02 0.94 1.00 6.17 9 A9 41.39 A4-A3 4.04 M9 0.02 M9+M10 0.52 0.81 1.00 3.27 10 A10 39.17 A4-A3 -2.22 M10 0.50 M10 0.50 0.81 1.00 -1.80 TOTAL 380.37
Maximum Section size = 380.93 Ah
Duration of period (minutes) Temp Derating factor Tf Required sec. Size (amp*Kt*Tf)
Including Spare Capacity (1.2) = 548.54 Ah