LAST MINUTE REVISION

 IB Section- 

There are three Push buttons in IB panel.

PB 1- To reset Axle counter when IB Home passed at ON

PB 2- To reset Axle counter due to failure or improper counting.

PB 3 - To give co operation to the station at rear.

PB 1 and PB 2 can be used only with co operation of station ahead. This co operation is given by pressing PB 3 and indicated by white line near PB1 or PB 2.

There are four Indicators at IB panel.

K1 Indicator-

When a train passes IB at ON,K1 indicator appears and alarm sounds. This indication disappears after normal restoration of circuits by using PB1 and Co operation from Station master.

K2 Indicator-

When train passes LSS and enters Axle counter section, K2 Indicator appears and alarm sounds. This indication disappear when as LSS knob is put back to Normal.

K3 Indicator- 

When a train passes IB at OFF, K3 indicator appears and alarm sounds. This indication disappears, IBS knob is normalized.

K4 Indicator- 

Appears when power supply of IB signals fails. Disappears after restoration of power supply.

Speed in A route -130 to 160 kmph

Speed in B route - 100 to 130 kmph

230 mm - Dia of Disc of markers.

Movement authority -

Record of critical events need to be stored for 90 days.

Frequency used in TCAS

441.8 MHZ

456.8 MHZ

416.8 MHZ

466.8 MHZ

426.8 MHZ

Communication between Station Kavach and Loco Kavach - 1024 bits.

Station kavach to NMS - E1 Interface 

LOCO Kavach to NMS- GSM interface in older versions of kavach.In Kavach 4.0, LTE - R  ( 4G for Rail)

Station Kavach - 6 RIU

LS Mode ( Limited Supervision) - 

Automatically enters LS mode when valid radio data packets are not received for a specific duration (30 sec in Absolute and 10 second in Automatic)

Communication Range in TCAS is 1.5km normally and in double distant territory, it is 4.5 kms.

Duplicate RFID tag - 3 to 5 m

Station kavach to NMS - 5 to 7 Station kavach in one E1 ring

Frequency of Operation of RFID is 865 - 867 Mhz.,Relaible upto 200 kmph

F0 freq - Loco kavach transmits in Block Section and in emergency it transmits 

RFID Tag Marker-

1. RFID number 

2. Type 

3. Absolute location 

Approx 10 V AC will induce into 100m track circuits

If neutral section is provided after stop signal,the distance should be preferably 1600 m away on Section with up gradient upto 1 in 300 and 2500 m with higher gradient upto 1 in 200.

700 m - Minimum Clearance of Signal Post or its fitting from live OHE conductor during the 2.2 KV anti theft measure charging.

Magnitude and duration of the current in LPZ0A is 100 KVA and 10/350 Micro Second.

Class B - ( Stage 1 Protection)

It can handle 100 KAmp current between Neutral and Earth.

50 KAmp current between all three phases and neutral.

Response time of Class C is less than 25 n seconds

OC should be placed at maximum distance of 15 Kms from CIU.

For EI- System availability (operational Availability of Complete system) shall be 99.98% or better.

FAT-

Performed with computer Simulation

Control table ( including Negative Testing)

Cross table ( Also known as Square sheet testing)-Conflicting movement testing.

SAT -

Logic and interlocking Testing:

1. Control table ( including Negative Testing)

2. Cross table ( Also known as Square sheet testing

Table )

Interface and Equipment function test

1. Intercommunication test between sub racks

2. Correspondence test.

EI system back up data of Minimum 10 lakhs or one month data.

Upto 100 routes - Centralized/ Distributed EI  Can be provided with approval of CSTE.

100 to 500 routes -Distributed EI

More than 500 routes - RRI with Metal to Metal or Distributed EI.

TSAA upto 200 routes - PCSTE approval required. TSAA must be prepared as per TAN.

Warm Standby Arrangement of EI - Only one system will switch on.

10 Second- Time taken in EI to take longest route and display.

 lowered signal 

Train/ Four Wheeler/ Bullock Cart/Tonga - 01 unit.

Cycle Rikshaw/Auto Rikshaw - 0.50 unit

Motor cycle - 0.25 unit

Minimum distance of lifting barrier from centre of nearest track is 3.5 m Minimum (As per new SEM).

All the track Relay are of 9 ohms. Track Relay shall be inspected Quarterly by JE/SSE.

QNA1 relay coil Resistance Resistance- 200 ohms

Contact resistance of Q series relay - 0.20 ohms 

Minimum Clearance of Check Rail

At Curve -44 mm

LC gate - 51 mm.

Clearance from bottom of the rail for ground connection rods - 40 mm in RE area.

Point Indicator ( for Non Interlocked points)  

1) When point are set for straight line, the indicator shall display a white target by day and white light by night.

2) When point set for diverging line, the indicator shall display the edge of Disc by day and Green light by night.

Trap Indicator-

Shows Red when trap switches are open, Shows Green when they are locked.

Automatic signaling shall not provided with heavy and continuous falling gradients steeper than 1 in 80 unless the brake power of train on section is adequate to enable to stop at each Automatic stop signal.

The suitability of Automatic Signalling on heavy and continuous rising gradients shall be decided in consultation with concerned departments.

Height of centre of circle of goods warning board is 3.65 m from Rail level. The dimension of rectangular board is 1800× 530 mm.In Double distant terroritary, there is no need of this board.

Red-60 LED

Yellow- 60 LED

Green- 30 LED 

Reaction distance on Indian Railway is 200 m

For STD III and STD IV, Double Distant is Mandatory. 

On STD II,it is required in section where EBD is more than 1 Km. 

If speed is more than 110 kmph then double distant signal is required. 

Advantages of CTC-

1) Better line Capacity 

2) Time table Management 

3) Automatic Route Setting 

Flexibility is not the advantage of CTC.

Sectional Route Relese is provided if no of routes are more than 100

Air conditioning may be provided for every Signal interlocking  with more than 100 routes.