Sizing of IPS for upto 4L station on Single line section with DC LED Signals in Non-RE area

Load Application Remarks

1 2 3 4 5 6 7 8 9 10 11 12 13 14

DC

-DC

Co

nv

ert

ers

210 0.070 24 14.7 352.8 0.8 441.00 3 2

30 0.025 24 0.75 18 0.8 22.50 1 1 2

Block Local - - 24 3.5 84 0.8 105.00 1 1 2

2 1.5 24 3 72 0.8 90.00 1 1 2

- - 12 4.5 54 0.8 67.50 1 1 2

- - 24 0.8 19.2 0.8 24.00 1 1 2

- - 40 0.5 20 0.5 40.00 1 1 2

- - 40 0.5 20 0.5 40.00 1 1 2

Block Tel Up - - 4 0.1 0.4 0.3 1.33 1 1 2

Block Tel Dn - - 4 0.1 0.4 0.3 1.33 1 1 2

- - 12 5 60 0.8 75.00 1 1 2

- - 24 8 192 0.8 240.00 2 2 4

No of relays /

sub systems

Current per Relay/ Sub system (A)

Voltage (V)

Current (A)

Power (VxA)

Eff (n)

Total Power (VxA/n)

Module Rating

Basic Module reqmt

No of Modules as

Hot Standby

Total No of Modules

Relay Internal

24-32V/

5A

5 +1 Cold standby

Total relays considered are 525 but 40% of relays assumed to be drawing current at a time . This being a critical application , n+2 configuration has been adopted for hot standby.

Relay External

24-32V / 5A

Total relays considered are 60 but 50% of relays assumed to be drawing current at a time.

24-32V / 5A

Axle-24V ( BPAC

)

24-32V / 5A

Panel Ind & Hkt

12-28V/ 5A

Magneto Telephone

12-28 V/ 1A

Block Line Up

12-40V / 1A

Alternatively 60-110V / 1 Amp may also be used depending upon requirement.

Block Line Dn

12-40V / 1A

3-6V / 0.1

A3-6V / 0.1 A

Spare cell Chargers

2-12V / 5 A

Wired Spare slot-1

24-32V/ 5A

May be utilised for any other application like SSI etc.

Sizing of IPS for upto 4L station on Single line section with DC LED Signals in Non-RE area

Load Application Remarks

1 2 3 4 5 6 7 8 9 10 11 12 13 14

No of relays /

sub systems

Current per Relay/ Sub system (A)

Voltage (V)

Current (A)

Power (VxA)

Eff (n)

Total Power (VxA/n)

Module Rating

Basic Module reqmt

No of Modules as

Hot Standby

Total No of Modules

DC

-DC

Co

nv

ert

ers

- - 24 4 96 0.8 120.00 1 1 2

Total Equipment DC Load (VA) 1267.67Equipment DC Load at 110 V (Amp) 11.52

Inv

ert

er

Main Sig 18 0.125 110 2.25 247.5 1 247.5Route 10 0.125 110 1.25 137.5 1 137.5Shunt Sig 4 0.125 110 0.5 55 1 55

Calling on 0 0.125 110 0 0 1 0

Total output power (VA) = 440.00

Input current at 110V D.C. (Amp) = 4.00

Total Load Current at 110V D.C. (Amp) = 15.52

Ba

tte

ry

Battery Backup required (in hrs) = 8

Maximum Depth of Discharge in % = 50

Battery AH Required = 248.39

Hence Battery AH (select the nearst standard value ) = 300.00

C/10 charging rate = 30.00Total DC load at 110V busbar (i.e. SMR O/P current) (Amp) = 45.52

Total Power at the output of SMRs at 110V D.C. (VA) = 5007.67

Total current at Input of SMRs at 230V A.C. (Amp) = 24.19 Efficiency of SMR 90%

Wired Spare slot-2

24-32V/ 5A

May be utilised for any other application like Datalogger etc.

Not required in addition to Main and route signal

Battery back up is expected to increase by 2 -3 hrs. since load of 16.14A is under worst condition.

Permissible depth of discharge taken as 50%, since battery shall not be able to recoup full charge if it is deep discharged frequently i.e 70% or 80% and its service life will also gets reduced.

Sizing of IPS for upto 4L station on Single line section with DC LED Signals in Non-RE area

Load Application Remarks

1 2 3 4 5 6 7 8 9 10 11 12 13 14

No of relays /

sub systems

Current per Relay/ Sub system (A)

Voltage (V)

Current (A)

Power (VxA)

Eff (n)

Total Power (VxA/n)

Module Rating

Basic Module reqmt

No of Modules as

Hot Standby

Total No of Modules

Total current at Input of SMRs at 150V A.C. (Amp) = 37.09 Under lowest Voltage condition

Sizing of IPS for upto 4L station on Single line section with DC LED Signals in Non-RE area

Load Application Remarks

1 2 3 4 5 6 7 8 9 10 11 12 13 14

No of relays /

sub systems

Current per Relay/ Sub system (A)

Voltage (V)

Current (A)

Power (VxA)

Eff (n)

Total Power (VxA/n)

Module Rating

Basic Module reqmt

No of Modules as

Hot Standby

Total No of Modules

Track circuit Load calculationEach track circuit wattage = 12.00

24.24

No of Track Circuits = 20

Total Track circuit load (VA) = 484.85

Total Wattage of track circuits at the input of CVT (VA ) = 606.06

Total Current at Input of Track CVT at 230V A.C. (Amp) = 2.64

26.83

8021.18

Hence the nearest standard Generator Capacity selected = 10KVA

Notes :

Following assumptions have been made in above calculation -

Each track circuit VA including Track feed charger and Track Transformer =

Considering track feed charger efficiency 55% and transformer efficiency 90%

Total Current on IPS Input at 230 V = SMR I/P Current + Track CVT I/P Current Required Generator source capacity= Total current on IPS I/Px230x1.3 (safety factor)=

a) The calculation is made at the AC Input Mains voltage of 230V and DC busbar nominal voltage of 110V . The input current at 230V will increase at 150V AC to a value as shown above and the input source may be ensured to provide this load.

b) Signalling load of 16.14A at 110V DC except track circuit is considering the loads for Spare cell charger, Data logger & SSI equipment connected to IPS. Also, though block line, block tele and Route indicator are intermittent loads, the sizing is based taking it continuous load as worst condition.

c) Point load is not considered for this calculation as its is momentary ( <10secs) and that the surge current required by point machines is provided by battery during this period.

d) Track Circuits load are directly fed from the Mains / DG Set through a CVT and Step Down Transformers and not through Inverter. Axle counters have been used only for block proving and not in lieu of track cirucits.

Sizing of IPS for upto 4L station on Single line section with AC LED Signals in Non-RE area

Load Application Eff (n) Remarks

1 2 3 4 5 6 7 8 9 10 11 12 13 14

DC

-DC

Co

nv

ert

ers

210 0.070 24 14.7 352.8 0.8 441.00 3 2

30 0.025 24 0.75 18 0.8 22.50 1 1 2

Block Local - - 24 3.5 84 0.8 105.00 1 1 2

2 1.5 24 3 72 0.8 90.00 1 1 2

- - 12 4.5 54 0.8 67.50 1 1 2

- - 24 0.8 19.2 0.8 24.00 1 1 2

- - 40 0.5 20 0.5 40.00 1 1 2

- - 40 0.5 20 0.5 40.00 1 1 2

Block Tel Up - - 4 0.1 0.4 0.3 1.33 1 1 2

Block Tel Dn - - 4 0.1 0.4 0.3 1.33 1 1 2

- - 12 5 60 0.8 75.00 1 1 2

- - 24 8 192 0.8 240.00 2 2 4

No of relays /

sub systems

Current per Relay/ Sub system (A)

Voltage (V)

Current (A)

Power (VxA)

Total Power (VxA/n)

Module Rating

Basic Module reqmt

No of Modules as

Hot Standby

Total No of Modules

Relay Internal

24-32V/

5A

5+1 Cold standby

Total relays considered are 525 but 40% of relays assumed to be drawing current at a time . This being a critical application , n+2 configuration has been adopted for hot standby.

Relay External

24-32V / 5A

Total relays considered are 60 but 50% of relays assumed to be drawing current at a time.

24-32V / 5A

Axle-24V

( BPAC )

24-32V / 5A

Panel Ind & Hkt

12-28V/ 5A

Magneto Telephone

12-28 V/ 1A

Block Line Up

12-40V / 1A

Alternatively 60-110V / 1 Amp may also be used depending upon requirement.

Block Line Dn

12-40V / 1A

3-6V / 0.1

A3-6V / 0.1 A

Spare cell Chargers

2-12V / 5 A

Wired Spare slot-1

24-32V/ 5A

May be utilised for any other application like SSI etc.

Sizing of IPS for upto 4L station on Single line section with AC LED Signals in Non-RE area

Load Application Eff (n) Remarks

1 2 3 4 5 6 7 8 9 10 11 12 13 14

No of relays /

sub systems

Current per Relay/ Sub system (A)

Voltage (V)

Current (A)

Power (VxA)

Total Power (VxA/n)

Module Rating

Basic Module reqmt

No of Modules as

Hot Standby

Total No of Modules

DC

-DC

Co

nv

ert

ers

- - 24 4 96 0.8 120.00 1 1 2

Total Equipment DC Load (VA) 1267.67Equipment DC Load at 110 V (Amp) 11.52

Inv

ert

er

Main Sig 18 0.140 110 2.52 277.2 0.93 298.065Route 10 0.140 110 1.4 154 0.93 165.591Shunt Sig 4 0.140 110 0.56 61.6 0.93 66.2366

Calling on 0 0.140 110 0 0 0.93 0

Total power at the output of Inverter (VA) = 529.89

Hence Inverter capacity required (VA) = 662.37 Efficiency of inverter 80%

Selected inverter capacity (VA) = 1000.00 Taking overloading etc.

Inverter input current at 110V DC (Amp.) = 6.02

Total Load Current at 110V D.C. (Amp) = 17.55

Ba

tte

ry

Battery Backup required (in hrs) = 8

Maximum Depth of Discharge in % = 50

Battery AH Required = 280.73

Hence Battery AH (select the nearst standard value ) = 300

C/10 charging rate = 30.00

Total DC load at 110V busbar (i.e. SMR O/P current) (Amp) = 47.55

Total Power at the output of SMRs at 110V D.C. (VA) = 5230.03

Total current at Input of SMRs at 230V A.C. (Amp) = 25.27 Efficiency of SMR 90%

Wired Spare slot-2

24-32V/ 5A

Wired slots may be utilised for any other application like Datalogger etc.

Not required in addition to Main and route signal

Battery back up is expected to increase by 2 -3 hrs. since load of 18.16A is under worst condition.

Permissible depth of discharge taken as 50%, since battery shall not be able to recoup full charge if it is deep discharged frequently i.e 70% or 80% and its service life will also gets reduced.

Sizing of IPS for upto 4L station on Single line section with AC LED Signals in Non-RE area

Load Application Eff (n) Remarks

1 2 3 4 5 6 7 8 9 10 11 12 13 14

No of relays /

sub systems

Current per Relay/ Sub system (A)

Voltage (V)

Current (A)

Power (VxA)

Total Power (VxA/n)

Module Rating

Basic Module reqmt

No of Modules as

Hot Standby

Total No of Modules

Total current at Input of SMRs at 150V A.C. (Amp) = 38.74 Under lowest Voltage condition

Sizing of IPS for upto 4L station on Single line section with AC LED Signals in Non-RE area

Load Application Eff (n) Remarks

1 2 3 4 5 6 7 8 9 10 11 12 13 14

No of relays /

sub systems

Current per Relay/ Sub system (A)

Voltage (V)

Current (A)

Power (VxA)

Total Power (VxA/n)

Module Rating

Basic Module reqmt

No of Modules as

Hot Standby

Total No of Modules

Track circuit Load calculationEach track circuit wattage = 12.00

24.24

No of Track Circuits = 20

Total Track circuit load (VA) = 484.85

Total Wattage of track circuits at the input of CVT (VA ) = 606.06

Total Current at Input of Track CVT at 230V A.C. (Amp) = 2.64

27.90

8342.37

Hence the nearest standard Generator Capacity selected = 10 KVA

Notes :

Following assumptions have been made in above calculation -

Each track circuit VA including Track feed charger and Track Transformer =

Considering track feed charger efficiency 55% and transformer efficiency 90%

Total Current on IPS Input at 230 V = SMR I/P Current + Track CVT I/P Current Required Generator source capacity= Total current on IPS I/Px230x1.3 (safety factor)=

a) The calculation is made at the AC Input Mains voltage of 230V and DC busbar nominal voltage of 110V . The input current at 230V will increase at 150V AC to a value as shown above and the input source may be ensured to provide this load.

b) Signalling load of 18.16A at 110V DC except track circuit is considering the loads for Spare cell charger, Data logger & SSI equipment connected to IPS. Also, though block line, block tele and Route indicator are intermittent loads, the sizing is based taking it continuous load as worst condition.

c) Point load is not considered for this calculation as its is momentary ( <10secs) and that the surge current required by point machines is provided by battery during this period.

d) Track Circuits load are directly fed from the Mains / DG Set through a CVT and Step Down Transformers and not through Inverter. Axle counters have been used only for block proving and not in lieu of track cirucits.

Load Application Remarks

1 2 3 4 5 6 7 8 9 10 11 12 13 14

DC

-DC

Co

nv

ert

ers

180 0.070 24 12.6 302.4 0.8 378.00 3 2

20 0.025 24 0.5 12 0.8 15.00 1 1 2

Block Local - - 24 3.5 84 0.8 105.00 1 1 2

2 1.5 24 3 72 0.8 90.00 1 1 2

- - 12 4 48 0.8 60.00 1 1 2

- - 24 0.8 19.2 0.8 24.00 1 1 2

- - 40 0.5 20 0.5 40.00 1 1 2

- - 40 0.5 20 0.5 40.00 1 1 2

Block Tel Up - - 4 0.1 0.4 0.3 1.33 1 1 2

Block Tel Dn - - 4 0.1 0.4 0.3 1.33 1 1 2

- - 12 5 60 0.8 75.00 1 1 2

- - 24 8 192 0.8 240.00 2 2 4

Sizing of IPS for upto 3L station on Single line section & upto 4L station on Double line section with DC LED Signals in Non-RE area

No of relays /

sub systems

Current per Relay/ Sub system (A)

Voltage (V)

Current (A)

Power (VxA)

Eff (n)

Total Power (VxA/n)

Module Rating

Basic Module reqmt

No of Modules as

Hot Standby

Total No of Modules

Relay Internal

24-32V/

5A

5 +1

Cold standby

Total relays considered are 450 and 40% of relays assumed to be drawing current at a time . This being a critical application , n+2 configuration has been adopted for hot standby.

Relay External

24-32V / 5A

Total relays considered are 40 and 50% of relays assumed to be drawing current at a time.

24-32V / 5A

Axle-24V ( BPAC

)

24-32V / 5A

Panel Ind & Hkt

12-28V/ 5A

Magneto Telephone

12-28 V/ 1A

Block Line Up

12-40V / 1A

Alternatively 60-110V / 1 Amp may also be used depending upon requirement.

Block Line Dn

12-40V / 1A

3-6V / 0.1

A3-6V / 0.1 A

Spare cell Chargers

2-12V / 5 A

Wired Spare slot-1

24-32V/ 5A

May be utilised for any other application like SSI etc.

Load Application Remarks

1 2 3 4 5 6 7 8 9 10 11 12 13 14

Sizing of IPS for upto 3L station on Single line section & upto 4L station on Double line section with DC LED Signals in Non-RE area

No of relays /

sub systems

Current per Relay/ Sub system (A)

Voltage (V)

Current (A)

Power (VxA)

Eff (n)

Total Power (VxA/n)

Module Rating

Basic Module reqmt

No of Modules as

Hot Standby

Total No of Modules

DC

-DC

Co

nv

ert

ers

- - 24 4 96 0.8 120.00 1 1 2

Total Equipment DC Load (VA) 1189.67Equipment DC Load at 110 V (Amp) 10.82

Inv

ert

er

Main Sig 16 0.125 110 2 220 1 220Route 10 0.125 110 1.25 137.5 1 137.5Shunt Sig 4 0.125 110 0.5 55 1 55

Calling on 0 0.125 110 0 0 1 0

Total output power (VA) = 412.50

Input current at 110V D.C. (Amp) = 3.75

Total Load Current at 110V D.C. (Amp) = 14.57

Ba

tte

ry

Battery Backup required (in hrs) = 8

Maximum Depth of Discharge in % = 50

Battery AH Required = 233.04

Hence Battery AH (select the nearst standard value ) = 300

C/10 charging rate = 30.00

Total DC load at 110V busbar (i.e. SMR O/P current) (Amp) = 44.57

Total Power at the output of SMRs at 110V D.C. (VA) = 4902.17

Total current at Input of SMRs at 230V A.C. (Amp) = 23.68 Efficiency of SMR 90%

Wired Spare slot-2

24-32V/ 5A

May be utilised for any other application like Datalogger etc.

Not required in addition to Main and route signal

Battery back up is expected to increase by 2 -3 hrs. since load of 14.97A is under worst condition.

Permissible depth of discharge taken as 50%, since battery shall not be able to recoup full charge if it is deep discharged frequently i.e 70% or 80% and its service life will also gets reduced.

Load Application Remarks

1 2 3 4 5 6 7 8 9 10 11 12 13 14

Sizing of IPS for upto 3L station on Single line section & upto 4L station on Double line section with DC LED Signals in Non-RE area

No of relays /

sub systems

Current per Relay/ Sub system (A)

Voltage (V)

Current (A)

Power (VxA)

Eff (n)

Total Power (VxA/n)

Module Rating

Basic Module reqmt

No of Modules as

Hot Standby

Total No of Modules

Total current at Input of SMRs at 150V A.C. (Amp) = 36.31 Under lowest Voltage condition

Load Application Remarks

1 2 3 4 5 6 7 8 9 10 11 12 13 14

Sizing of IPS for upto 3L station on Single line section & upto 4L station on Double line section with DC LED Signals in Non-RE area

No of relays /

sub systems

Current per Relay/ Sub system (A)

Voltage (V)

Current (A)

Power (VxA)

Eff (n)

Total Power (VxA/n)

Module Rating

Basic Module reqmt

No of Modules as

Hot Standby

Total No of Modules

Track circuit Load calculationEach track circuit wattage = 12.00

24.24

No of Track Circuits = 15

Total Track circuit load (VA) = 363.64

Total Wattage of track circuits at the input of CVT (VA ) = 454.55

Total Current at Input of Track CVT at 230V A.C. (Amp) = 1.98

25.66

7671.82

Hence the nearest standard Generator Capacity selected = 10KVA

Notes :

Following assumptions have been made in above calculation -

Each track circuit VA including Track feed charger and Track Transformer =

Considering track feed charger efficiency 55% and transformer efficiency 90%

Total Current on IPS Input at 230 V = SMR I/P Current + Track CVT I/P Current

Required Generator source capacity= Total current on IPS I/Px230x1.3 (safety factor)=

a) The calculation is made at the AC Input Mains voltage of 230V and DC busbar nominal voltage of 110V . The input current at 230V will increase at 150V AC to a value as shown above and the input source may be ensured to provide this load.b) Signalling load of 14.97A at 110V DC except track circuit is considering the loads for Spare cell charger, Data logger & SSI equipment connected to IPS. Also, though block line, block tele and Route indicator are intermittent loads, the sizing is based taking it continuous load as worst condition.

c) Point load is not considered for this calculation as its is momentary ( <10secs) and that the surge current required by point machines is provided by battery during this period.

d) Track Circuits load are directly fed from the Mains / DG Set through a CVT and Step Down Transformers and not through Inverter. Axle counters have been used only for block proving and not in lieu of track cirucits.

Load Application Eff (n) Remarks

1 2 3 4 5 6 7 8 9 10 11 12 13 14

DC

-DC

Co

nv

ert

ers

180 0.070 24 12.6 302.4 0.8 378.00 3 2

20 0.025 24 0.5 12 0.8 15.00 1 1 2

Block Local - - 24 3.5 84 0.8 105.00 1 1 2

2 1.5 24 3 72 0.8 90.00 1 1 2

- - 12 4 48 0.8 60.00 1 1 2

- - 24 0.8 19.2 0.8 24.00 1 1 2

- - 40 0.5 20 0.5 40.00 1 1 2

- - 40 0.5 20 0.5 40.00 1 1 2

Block Tel Up - - 4 0.1 0.4 0.3 1.33 1 1 2

Block Tel Dn - - 4 0.1 0.4 0.3 1.33 1 1 2

- - 12 5 60 0.8 75.00 1 1 2

- - 24 8 192 0.8 240.00 2 2 4

Sizing of IPS for upto 3L station on Single line section & upto 4L station on Double line section with AC LED Signals in Non-RE area

No of relays /

sub systems

Current per Relay/ Sub system (A)

Voltage (V)

Current (A)

Power (VxA)

Total Power (VxA/n)

Module Rating

Basic Module reqmt

No of Modules as

Hot Standby

Total No of Modules

Relay Internal

24-32V/

5A

5+1 Cold standby

Total relays considered are 450 and 40% of relays assumed to be drawing current at a time . This being a critical application , n+2 configuration has been adopted for hot standby.

Relay External

24-32V / 5A

Total relays considered are 40 but 50% of relays assumed to be drawing current at a time.

24-32V / 5A

Axle-24V

( BPAC )

24-32V / 5A

Panel Ind & Hkt

12-28V/ 5A

Magneto Telephone

12-28 V/ 1A

Block Line Up

12-40V / 1A

Alternatively 60-110V / 1 Amp may also be used depending upon requirement.

Block Line Dn

12-40V / 1A

3-6V / 0.1

A3-6V / 0.1 A

Spare cell Chargers

2-12V / 5 A

Wired Spare slot-1

24-32V/ 5A

May be utilised for any other application like SSI etc.

Load Application Eff (n) Remarks

1 2 3 4 5 6 7 8 9 10 11 12 13 14

Sizing of IPS for upto 3L station on Single line section & upto 4L station on Double line section with AC LED Signals in Non-RE area

No of relays /

sub systems

Current per Relay/ Sub system (A)

Voltage (V)

Current (A)

Power (VxA)

Total Power (VxA/n)

Module Rating

Basic Module reqmt

No of Modules as

Hot Standby

Total No of Modules

DC

-DC

Co

nv

ert

ers

- - 24 4 96 0.8 120.00 1 1 2

Total Equipment DC Load (VA) 1189.67Equipment DC Load at 110 V (Amp) 10.82

Inv

ert

er

Main Sig 16 0.140 110 2.24 246.4 0.93 264.946Route 10 0.140 110 1.4 154 0.93 165.591Shunt Sig 4 0.140 110 0.56 61.6 0.93 66.2366

Calling on 0 0.140 110 0 0 0.93 0

Total power at the output of Inverter (VA) = 496.77

Hence Inverter capacity required (VA) = 620.97 Efficiency of inverter 80%

Selected inverter capacity (VA) = 1000.00 Taking overloading etc.

Inverter input current at 110V DC (Amp.) = 5.65

Total Load Current at 110V D.C. (Amp) = 16.46

Ba

tte

ry

Battery Backup required (in hrs) = 8

Maximum Depth of Discharge in % = 50

Battery AH Required = 263.37

Hence Battery AH (select the nearst standard value ) = 300

C/10 charging rate = 30.00Total DC load at 110V busbar (i.e. SMR O/P current) (Amp) = 46.46

Total Power at the output of SMRs at 110V D.C. (VA) = 5110.63

Total current at Input of SMRs at 230V A.C. (Amp) = 24.69 Efficiency of SMR 90%

Wired Spare slot-2

24-32V/ 5A

Wired slots may be utilised for any other application like Datalogger etc.

Not required in addition to Main and route signal

Battery back up is expected to increase by 2 -3 hrs. since load of 16.87A is under worst condition.

Permissible depth of discharge taken as 50%, since battery shall not be able to recoup full charge if it is deep discharged frequently i.e 70% or 80% and its service life will also gets reduced.

Load Application Eff (n) Remarks

1 2 3 4 5 6 7 8 9 10 11 12 13 14

Sizing of IPS for upto 3L station on Single line section & upto 4L station on Double line section with AC LED Signals in Non-RE area

No of relays /

sub systems

Current per Relay/ Sub system (A)

Voltage (V)

Current (A)

Power (VxA)

Total Power (VxA/n)

Module Rating

Basic Module reqmt

No of Modules as

Hot Standby

Total No of Modules

Total current at Input of SMRs at 150V A.C. (Amp) = 37.86 Under lowest Voltage condition

Load Application Eff (n) Remarks

1 2 3 4 5 6 7 8 9 10 11 12 13 14

Sizing of IPS for upto 3L station on Single line section & upto 4L station on Double line section with AC LED Signals in Non-RE area

No of relays /

sub systems

Current per Relay/ Sub system (A)

Voltage (V)

Current (A)

Power (VxA)

Total Power (VxA/n)

Module Rating

Basic Module reqmt

No of Modules as

Hot Standby

Total No of Modules

Track circuit Load calculationEach track circuit wattage = 12.00

24.24

No of Track Circuits = 15

Total Track circuit load (VA) = 363.64

Total Wattage of track circuits at the input of CVT (VA ) = 454.55

Total Current at Input of Track CVT at 230V A.C. (Amp) = 1.98

26.67

7972.94

Hence the nearest standard Generator Capacity selected = 10KVA

Notes :

Following assumptions have been made in above calculation -

Each track circuit VA including Track feed charger and Track Transformer =

Considering track feed charger efficiency 55% and transformer efficiency 90%

Total Current on IPS Input at 230 V = SMR I/P Current + Track CVT I/P Current Required Generator source capacity= Total current on IPS I/Px230x1.3 (safety factor)=

a) The calculation is made at the AC Input Mains voltage of 230V and DC busbar nominal voltage of 110V . The input current at 230V will increase at 150V AC to a value as shown above and the input source may be ensured to provide this load.

b) Signalling load of 16.87A at 110V DC except track circuit is considering the loads for Spare cell charger, Data logger & SSI equipment connected to IPS. Also, though block line, block tele and Route indicator are intermittent loads, the sizing is based taking it continuous load as worst condition.

c) Point load is not considered for this calculation as its is momentary ( <10secs) and that the surge current required by point machines is provided by battery during this period.

d) Track Circuits load are directly fed from the Mains / DG Set through a CVT and Step Down Transformers and not through Inverter. Axle counters have been used only for block proving and not in lieu of track cirucits.