ACT (RS) ABB Loco (English) (42. PROTECTIVE SCHEME)

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ACT (RS) ABB Loco (English) (42. PROTECTIVE SCHEME)

January 10, 2021, 12:34 PM

PROTECTION SCHEME

Protective measures by control electronics:

Initiation of protective measure in dangerous situation is controlled by Control Electronics. MCE monitors a range of values such as voltage, current, temperature, pressure and other signals.

Catenary voltage out of range

When catenary voltage drop down below 17.0 KV and raise above 30 KV VCB will open automatically.

Temperature protection- When temp of Transformer exceeds beyond 84 degree C, for more than 10 sec, VCB will trip. Primary Over Current Protection (QLM) Reason for over current.

1. Disturbance in measurement of primary current.

2. Fault in converter.

3. Short circuit in Xmer winding

4. Check machine room for oil flash/smoke/abnormal.

5. Check OCR.78 is in normal. If any thing is abnormal- fail the loco.

If VCB trips during ‘C’ mode then check oil level of Xmer and converter and check relay 78. If any thing is abnormal, fail the loco.

Train Parting: Airflow measuring valve is provided in loco. Whenever train get parted, or air flow increased and AFM get activated, resulted into glowing of LSAF and sounding of buzzer. Also message of ALARM CHAIN PULLING will appear on screen. As due to uncoupling / parting, the BP pressure start expelling at very fast rate, resulting into sudden drop in MR pressure which leads to Priority -1 message on screen “ Low Pressure Main reservoir”

So, after parting / uncoupling, the driver will get message of low MR pressure which is counter effect.

So, when ever AFI shoot up with sudden drop in BP pressure, your first duty is to act as in case load parting / accident (like switching ON of flasher light, protection of adjacent track, Securing of load / loco, etc.), After asserting that trailing load is OK, then think about the loco/ message.

Fire Alarm: In loco fire detection unit is provided in SB2. There are two smoke detector to detect the smoke in machine room.

When one detector detects the smoke –

1. Buzzer will sound

2. Priority-2 message will appear on screen.

When both detectors detect the smoke –

1. Priority-1 message will appear on the screen – Inspect Machine room

2. Throttle T/E, B/E becomes ‘0’

3. Buzzer will sound. Do the necessary arrangement to extinguish the fire by using suitable fire extinguisher provided in Cab1/2 and Machine Room 1/2 (Total 4 Nos.)

Resetting Of Fire Alarm:

1. Press Reset button on fire detection equipment provided in Machine Room (SB-2)

2. Press BPFA.

Action to be taken by Driver

1) Inspect the Machine room and take necessary action. In case of fire on loco, use big fire extinguisher provided in the rack behind asstt. Driver in cab. To operate this fire extinguisher, open the cut out coc and release the gas by rotating adjusting knob, gas will expel and extinguish the fire at appropriate places in machine room behind it. In addition to this two numbers of portable fire extinguishers are provided on the loco which should be used accordingly as per requirement.

2) To reset the FDU, press the white knob provided on it. To acknowledge the fault press BPFA. Resume normal traction. Note:- In case of defect in FDU, P-2 fault message will appear on the screen. After inspecting the machine room, reset the white knob on the FDU. Acknowledge the fault and keep watch on machine room. Alarm Chain Pulling:- When airflow increases without initiated by driver or CE i.e. in case of ACP/Gds brake applied/leakage in train/HPD etc. Following indication appears.

1. Air Flow Indicator needle will deviate.

2. LSAF will glow.

3. Buzzer will sound.

4. BPFA will illuminate with P-2 message.

5. Auto flasher will start.

ACP Indication:

1).Put right the ACP/leakage.

2).Buzzer will sound continuously until the leakage/ACP is arrested so to stop sounding, Press BPFA. If ACP/leakage is not arrested buzzer will start again.

3).When ACP leakage is put right, all indications will disappear, but for BPFA indication press it once.

This entry was posted in 2 Railway Employee, 7 Study Material & Guide, ABB Loco, AC Traction - Locomotive