Cost Saving for a 4-road Station with Distributed Interlocking over Centralised Interlocking:

In case of Distributed Interlocking system Object Controllers and Optical Fiber Cable are used in place of Main Signalling Copper Cable between Relay/Equipment Room and Location Boxes/ Goomties.

(a) All the items with Centralised EI are same with Distributed EI except: -

- -

- Copper cable from Central Interlocking Unit to Goomties is replaced by OFC by ring path.

- - -

- Modems are required for interfacing. -

- -

- At both end Object Controllers, CPU and Power supply cards are required. (All other cards are remain same)

(b) In case of Centralised EI, Cost of Copper cable from Central Interlocking Unit to Goomties: Sl. No Cable Size Length in KM.

Cable Cost per KM in

Rs. Lakhs Total Cost in Rs. Lakhs

1 30 Core 1.4 2.59 3.62

2 24 Core 5.6 2.16 12.09

3 18 Core 9.8 1.88 18.42

4 12 Core 5.6 1.19 6.66

Grand Total 40.80

Cable Trench size = 1400m X 0.3m X 1.2m

Workmanship cost for trenching, cable laying, termination of cable at both ends, location boxes, freight, transport, storage space, cut and theft of cable and maintenance cost all tighter the total cost shall be approximately Rs. 10 Lakhs.

Total cost = Rs 40.80 Lakhs + Rs 10 Lakhs = Rs 50.80 Lakhs

(c) In case of Distributed EI, Cost of OFC cable, modem and other cards: -

--

- Cost of OFC 3 Km = 3 X 0.4 Lakhs = Rs 1.2 Lakhs -

--

- Laying of OFC 3 Km = 3 X 0.5 Lakhs = Rs 1.5 Lakhs (Inclusive of HDPE pipe in ring path also)

- --

- Optical modem 6 nos. = 6 X 0.4 Lakhs = Rs 2.4 Lakhs -

--

- Other cards at OCs = 2 X 1 Lakhs = Rs 2 Lakhs Total cost = 7.1 Lakhs only

Thus, there is a net saving of Rs 50.80 Lakhs – Rs 7.1 Lakhs = Rs 43.7 Lakhs per station.

* * *

TESTING

2.36 Testing:

Testing of Microlok II electronic interlocking system is carried out in two phases. 1. System testing at factory premises called as Factory Acceptance Test. 2. System testing at site called as Site Acceptance Test.

2.36.1 Factory Acceptance Test

• Factory Acceptance Test (FAT) for Microlok-II EI system shall be tested in Factory environment with simulation setup to validate application software.

• The purpose of Factory Acceptance Test is to:

o Ensure that the Microlok II Interlocking system fulfils the station Interlocking & Rout Control Chart requirements and working in safe manner even if any false inputs / information received.

o Minimises the site errors & risks and reduces the corrections at site. This results in saving of time at site testing.

• FAT is carried out through simulation set up (using Simulator Panel with toggle switches or Simulator PC with Microlok Interlocking Simulation Setup - MISS software) in which all field inputs are simulated.

• FAT is carried out for each station interlocking separately.

• After designing the Application Software, designer issues it to the validation department for carrying the Factory Acceptance Test.

• It is carried out only through VDU panel, whereas Site Acceptance Test (SAT) is carried out through CCIP and VDU panels, if both the options are available at site.

• Application logic is modified for the FAT testing for Timer values used for signal, point, overlap and cancellation are reduced from 120 secs to12 secs to speed up the testing. It is essential that the original times are reinstated and validated at the completion of testing.

• In FAT setup, the I/O boards are not physically present and the same is simulated using the test setup (MISS). Therefore, field inputs and outputs delivered by Input and Output card will be disabled and will be directly delivered into simulation VDU. However this will not affect the interlocking part of the application logic.

To carry out FAT, the following inputs are required:

• Signal Interlocking Plan (SIP)

• Route Control Chart (RCC)

• Control cum Indication Panel Diagram

• Cross Table

• Microlok II Station Interlocking Application Software files as designed (.ML2, .MLL, .MLP)

After carrying out FAT, the following are the outputs:

• Microlok II Station Interlocking Application Software files as tested (.ML2, .MLL, .MLP)

• Ansaldo STS Total Management System (TMS) Forms

• FAT Certificate

For detailed testing procedure of FAT please Ref: Annexure

• If Railways/Customer testing is completed, then the Checksum and CRC values of the FAT simulated application logic will be recorded as per the Application Logic and it is to be jointly signed by Ansaldo STS and Railways representative.

2.36.2 Site Acceptance Test

• Site Acceptance Test (SAT) defines the procedure for Site testing of Microlok II Station Interlocking System, where tests are executed at site environment.

• SAT mainly involves the System integrity and functional testing of all equipments and interlocking testing also shall be carried out with full setup except the trackside equipments.

• SAT is carried out for each station separately.

• Results of the tests are observed and documented in a Test Report.

• The Site Acceptance Test ensures that all the equipments installed at site i.e. Microlok II, Communication equipments, Power supply equipments, Relays and Control cum Indication Panel are functioning correctly as per approved system configuration & station interlocking requirements and working in safe manner and failsafe even if any equipment fails / false inputs/information received.

• SAT ensures the overall system safety and error free system is being delivered to the client.

• To carry out SAT, the following inputs are required:

Microlok II .ml2, .mll & .mlp file (Hardcopy & Read-only Softcopy)
Station SIP

Station Route control chart

Station Control cum indication panel diagram
Cross tables

Wiring circuits

• All the equipments involved for station working is being installed before proceeding SAT, so there is no need of separate set up is required except to simulate the field inputs with Simulation panel.

• All the field inputs are simulated by using simulation panel through toggle switches and inputs are sending to Microlok II via relays and the field outputs are sending to lamps through relays.

The following testing shall be carried out while doing SAT

• Visual test

• Wire count test

• Bell test

• Insulation resistance test

• Earthing test

• Power On

• VCOR

• Communication testing

• Correspondence Test

• System Integrity Test

• Interlocking testing

• Change over test