POINT CIRCUIT(COLOUR).ppt

7/28/2019 POINT CIRCUIT(COLOUR).ppt

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POINT ORDERING CIRCUIT

(INT)N24V

(INT)B24V


3/19

POINT ODERING CIRCUIT.

Actuate for both auto route setting and

manual operation.

Use of magnetically latch relay to act asa memory during power failure case (as

the PIs are of push button type).

Track locking achieved during orderingof points.


4/19

Provision of operation of points duringpoint zone track circuit failure.

Prevention of ordering the points whenit is engaged with other conflictingroutes (may be set or initiated).

Crank handle locking incorporated onlyduring auto route setting leaving formanual operation for easymaintenance.

Latching/delatching circuit is providedwith double cutting features.


5/19

POINT TIMER CIRCUIT

20,000 MFD50V5W

100 OHM

(INT)B24V

(INT)N24V


6/19

Prevents over-rubbing of friction clutch.

Ceases the driving feed as soon as point

set and locked. Condenser value may be adjusted to

200% of normal operating time of the

motor at site. Certain time delay provided between two

successive operation.

POINT TIMER CIRCUIT


7/19

POINT OPERATION CIRCUIT

(INT)B24

N24


8/19

POINT DRIVING CIRCUIT

Heavy duty biased contactor relays used.

Cross protection of contactor relays

provided against false feed. Use of separate contactor relay for each end

of crossover to prevent self-unlocking.

Double cutting features provided forcontactor relays.


9/19

POINT DETECTION CIRCUIT

(INT)

N24

B24

(EXT)

2A

59RWKR NWR

59

(POINT)

N110

B110

(POINT)

2A

B110

(POINT)

(POINT)N110

NWPR59B

RWPR59B

59BNWPR

59B

RWPR

NW

RW

CW

NWPR59A

RWPR59A

59ANWPR CW

RW

NW

RWKPR59

59NWKR

NWKPR59

59NWR

RWR59

59RWR

59

NWKRR1 R2

59

RWKRR1 R2

59ARWPR

'F'

'E'

'D'

'C'

'B'

'A'

LOCATION

BOX

RELAY ROOM

LOCATION

BOX

JB

59A

JB

59B

POINT

MACHINE

59B

POINTMACHINE

59A

ND

ND

RD

RDRD

RD

ND

ND


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11/19

IMPROVEMENT OF POINT CIRCUIT

Suitable for Push Button, Route Setting typePanel.

Emergency point operation under Point ZoneTrack Fail condition introduced.

Crank Handle Interlocking introduced in PointDriving Circuit during auto route setting.

Separate tail cable used to prevent unwantedsituation due to multiple cable fault.

Using latch relay ensures the last operatedposition of the point like point switch.


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13/19

COMMENTS ON CSTE/SECRS LETTER

NO. SECR/S&T/DRG./1965 DATED

18.11.2008 This may be possible if contactor relay /

contactor group placed in the Track RelayLocation Box for Point Zone Track Circuit

i.e. for local feeding arrangement. Using contacts of normal Q-Series Relays

in the 110 V point driving circuit is notadvisable particularly during obstruction.

Parallelism of contacts cannot increase thecurrent carrying capacity because failureof any contacts / soldering may createunwanted situation.


14/19

Another heavy duty contactor relay is to beused affecting the economy.

Extra requirement of cable core for

generating repeater of WLR & EWNR atLocation Box.

Maximum relay wiring involves at LocationBox.

The total enhancement of safety dependsupon the relay named TPZR. The integrity ofTPZR relay is nowhere proved in interlockingand hence if it is forcefully picked up, then

normal working will not be disturbed buttotal expenditure / sophistication against theabnormal working of TPR and operation ofpoint under lock condition will become nulland void.


15/19

Using of one time time-delay for extracting ofno. of keys may not be advisable because this

operation is very rare and will be performedunder abnormal condition. So, individual time-delay for each crank handle group may becontinued. This is not affecting the economy.

As per Eastern Railway practice, the crossprotection against false feed on the contactorrelays will take care.

As per Eastern Railway practice, the emergencyoperation of point is provided.


16/19

COMMENTS ON TYPICAL

POINT CONTROL CIRCUIT OF

SE RLY. 24 Volt Siemens contactor unit used.

Cross protection against false feed in 110 V DC

circuit provided. Local control feeding for point drive.

Crank Handle contact used in Detection Circuit in

stead of 110 V circuit.

Detection Circuit is Cross protected during operation.

Driving Relays (WNPR/WRPR) is not cross

protected.


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PROVISION OF X-PROTECTION IN POINT DRIVE

CIRCUIT

(INT)

N24

B24

(EXT)

2A

59RWKR NWR

59

(POINT)

N110

B110

(POINT)

2A

B110

(POINT)

(POINT)

N110

NWPR59B

RWPR59B

59BNWPR

59BRWPR

NW

RW

CW

NWPR59A

RWPR59A

59ANWPR CW

RW

NW

RWKPR59

59NWKR

NWKPR59

59NWR

RWR59

59RWR

59

NWKRR1 R2

59

RWKRR1 R2

59ARWPR

'F'

'E'

'D'

'C'

'B'

'A'

LOCATION

BOX

RELAY ROOM

LOCATION

BOX

JB59A

JB

59B

POINT

MACHINE59B

POINT

MACHINE

59A

ND

ND

RD

RDRD

RD

ND

ND

59BNWPR

RWPR59B

RWPR59B

59BNWPR

NWPR59A

59ARWPR

59ARWPR

NWPR59A


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POINT CIRCUIT(COLOUR).ppt

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