EMU Components Code Abbreviations

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Questions and Answers

What does the code abbreviation 'ABB' represent in EMU components?

Buchholz Indication Relay

Auxiliary Supply Rectifier

Battery Isolating Switches

Air Blast Circuit Breaker (correct)

Which component is represented by the abbreviation 'BIR'?

Battery Isolating Relay

Buchholz Indication Relay (correct)

Current Limit Relay

Control Circuit Breaker

What is the function of the component denoted by the abbreviation 'EFRA 2'?

Earth Fault Relay for Auxiliary Circuit (correct)

Emergency Fault Relay

Earth Monitoring Switch

Electrical Failure Relay

What does the abbreviation 'CC 1' stand for in the context of EMU components?

Main Compressor Contactor Signup and view all the answers

The component represented by the abbreviation 'DVB' is responsible for which function?

Driver's Brake Valve Signup and view all the answers

Which of the following codes indicates an auxiliary supply device?

ASR Signup and view all the answers

What type of relay does the code 'CR' refer to in EMU components?

Compressor Relay Signup and view all the answers

Which component does 'EFRA 2' correlate with in functionality?

Earth Fault Relay for Auxiliary Circuit Signup and view all the answers

What is the code for the Air Blast Circuit Breaker Relay?

ABR Signup and view all the answers

What does the abbreviation 'BUD' represent in EMU components?

Buchholz Device Signup and view all the answers

What is the purpose of the Earth Fault Relay Power?

To detect and respond to earth faults Signup and view all the answers

Which component is associated with the Over Voltage Relay?

A relay for over voltage protection Signup and view all the answers

What is the function of the Battery Earthing Switch?

To ensure safe operation of the battery Signup and view all the answers

What does the acronym 'EFRP' stand for?

Earth Fault Relay Power Signup and view all the answers

What is the function of the 'Emergency Lighting Relay'?

Provides illumination during a power outage Signup and view all the answers

What is the main purpose of a Surge Suppression Unit?

To protect equipment from voltage spikes Signup and view all the answers

Which switch is specifically used for the Main Compressor Governor?

GS 3 Signup and view all the answers

Which of the following is a function of the 'Battery Charger Failure Relay'?

Indicates failure in the battery charging process Signup and view all the answers

Which of the following is NOT a designation used in this context?

PFDX Signup and view all the answers

What does the 'Starting Relay' do in a system?

Activates motor components Signup and view all the answers

What could be the role of the Aux.Circuit Earth Fault Relay?

To detect earth faults in auxiliary circuits Signup and view all the answers

Which relay is designed to protect against overload in transformers?

Transformer Over Load Protection Relay Signup and view all the answers

Which component provides a path for electrical currents during faults?

Earth Resistor for EFRP Signup and view all the answers

Which of the following functions is performed by the ammeter rotary shunt?

To allow for accurate current measurement Signup and view all the answers

Identify the switch used for tap changing contractors?

T 1 to T 9 Signup and view all the answers

What is the primary purpose of a 'Surge Diverter'?

To divert excess voltage Signup and view all the answers

What is the primary use of a series resistor for OVR?

To protect the relay from damage Signup and view all the answers

Which component is responsible for cooling in the system?

Rectifier Fan Signup and view all the answers

Which item is associated with the function of monitoring zero voltage conditions?

No Volt Relay Signup and view all the answers

For which governor is the 'Governor by Pass Switch for Control Governor' designated?

Control Governor Signup and view all the answers

What is the function of the component designated by the code 'ASR'?

Rectifies auxiliary supply Signup and view all the answers

Which component is indicated by the code 'BUD'?

Buchholz Device Signup and view all the answers

The function of the relay represented by 'CBAR' is primarily to:

Balance electrical phases Signup and view all the answers

Which of the following is designed to disconnect the battery quickly, as denoted by the code 'BIS'?

Battery Isolating Switch Signup and view all the answers

What is the primary role of the relay coded 'EFR'?

Detect earth faults Signup and view all the answers

The code 'DVB' corresponds to which component in the EMU setup?

Driver Brake Valve Signup and view all the answers

What type of monitoring device is identified by the code 'BIR'?

Buchholz Indication Relay Signup and view all the answers

The component with the code 'AFI to AFII' serves what purpose?

Fusing auxiliary circuits Signup and view all the answers

Which component does 'CC 2' refer to in the EMU components?

Auxiliary Compressor Contactor Signup and view all the answers

The relay signified by the code 'CLR 1' is identified as which type of relay?

Current Limit Relay Signup and view all the answers

Which component is associated with the function of an Over Voltage Relay?

ROVR Signup and view all the answers

Which of the following resistors is specifically designed for EFRP's auxiliary circuit?

REFRA 1 Signup and view all the answers

What role does the Surge Suppression Unit play in electrical systems?

It protects against voltage spikes. Signup and view all the answers

Which device serves as a switch for battery earthing?

HOBA Signup and view all the answers

Which resistors are associated with the series connection for Over Voltage Relay?

ROVR Signup and view all the answers

What type of shunt does the code 'SH 1 to SH 4' refer to?

Inductive Shunt Signup and view all the answers

Which component functions as a resistor for the earth fault relay?

RPP Signup and view all the answers

Which code refers to an Auxiliary Circuit Earth Fault Relay?

EFRA Signup and view all the answers

Which component represents a permanent field divert resistor?

PFD Signup and view all the answers

Which designation is linked to a battery earthing switch resistor?

RHOBA Signup and view all the answers

Which component is used for the auxiliary compressor governor?

GS 4 Signup and view all the answers

What is the primary role of the No Volt Relay?

To detect absence of voltage Signup and view all the answers

Which switch is designated for the EFR A 1?

HEFRA 1 Signup and view all the answers

What is the function of the Brake Relay?

To ensure braking mechanism functionality Signup and view all the answers

Which code represents the switch for tap changing reactors?

TL Signup and view all the answers

Which relay is associated with transformer over load protection?

OL 6 Signup and view all the answers

Identify the function of the Rectifier Fan Proving Relay.

To ensure fan operation Signup and view all the answers

Which code corresponds to the Motor Cut Out Switch for TM 3/4?

MCS 2 Signup and view all the answers

What is the designation for the Static Battery Charger?

SBC Signup and view all the answers

Which item is used for controlling the operation of TM 1 & 2?

K1 Signup and view all the answers

What does the abbreviation 'OVR' stand for?

Over Voltage Relay Signup and view all the answers

Which component is utilized for surge suppression?

Surge Suppression Unit Signup and view all the answers

Identify the component that serves as a switch for battery earthing.

Earthing Switch for Battery Signup and view all the answers

Which of the following codes corresponds to the Earth Fault Relay for auxiliary circuits?

EFRA Signup and view all the answers

What is the purpose of the component denoted by the abbreviation 'RPP'?

Resistor for Earth Fault Relay Power Signup and view all the answers

Which of these correspond to the ammeter rotary shunt?

ARS Signup and view all the answers

Identify the code that represents a series resistor for Over Voltage Relay.

ROVR Signup and view all the answers

What function does the device indicated by 'NC 1 to NC 4' perform?

Negative Contactors Signup and view all the answers

Which resistor is specifically designated for Earth Resistor for EFRP?

RPEFRA 1 Signup and view all the answers

What does the abbreviation 'SU' refer to in electrical components?

Surge Suppression Unit Signup and view all the answers

What does the code abbreviation 'BCC 1' refer to in EMU components?

Battery Charging Contactors Signup and view all the answers

Which of the following abbreviations denotes a type of relay used for current regulation?

CBR Signup and view all the answers

What function does the code 'AFI to AFII' serve?

Represents auxiliary fuses Signup and view all the answers

Which of the following components is represented by the abbreviation 'ASR'?

Auxiliary Supply Rectifier Signup and view all the answers

The component identified by the code 'EFR' is primarily designed for what purpose?

To monitor earth fault conditions Signup and view all the answers

Which component is indicated by the code 'CC 2'?

Auxiliary Compressor Contactor Signup and view all the answers

What is the purpose of the component denoted by the abbreviation 'BUD'?

Buchholz Device Signup and view all the answers

Which of the following components is identified by the code 'DL'?

Dropping Reactor Signup and view all the answers

What function does the relay represented by 'CLR 1' primarily serve?

Current Limit Protection Signup and view all the answers

The abbreviation 'EFRA 2' is associated with which functionality?

Earth Fault Relay for Auxiliary Circuit Signup and view all the answers

Which switch is used specifically for the Main Compressor Governor?

GS 3 Signup and view all the answers

What type of relay is associated with the code 'RFR'?

Rectifier Fan Proving Relay Signup and view all the answers

Which component is represented by the abbreviation 'OL 6'?

Over Load Protection Relay for Transformers Signup and view all the answers

The code 'MCS 1' corresponds to which switch type?

Cut Out Switch for TM 1/2 Signup and view all the answers

What is the function of the component denoted by 'NVR'?

No Volt Relay Signup and view all the answers

Which switch corresponds to the auxiliary compressor governor?

GS 4 Signup and view all the answers

What is the role of the 'Static Battery Charger', identified by the code 'SBC'?

Maintain battery voltage Signup and view all the answers

Which component is associated with the 'Transformers Thermostat Relay'?

TTR Signup and view all the answers

What does the code 'K1' represent?

Reversing Switch for TM 1 & 2 Signup and view all the answers

What is the primary function of the 'Brake Relay' indicated by the code 'BR'?

Engage the braking system Signup and view all the answers

Study Notes

EMU Components Code Abbreviations

ABB: Air Blast Circuit Breaker
ABR: Air Blast Circuit Breaker Relay
ARR: Air Blast Circuit Breaker Reset Relay
ABG: Air Blast Governor
ASR: Auxiliary Supply Rectifier
AFI to AFII: Auxiliary Fuses
BIS: Battery Isolating Switches
BIR: Buchholz Indication Relay
BUD: Buchholz Device
BF 1.2: Battery Fuses
BCC 1, BCC 2: Battery Charging Contactors
CF: Control Fuse
CLR 1, CLR 2: Current Limit Relay
CBR: Current Balance Relay
CBAR: Current Balance Auxiliary Relay
CC 1: Main Compressor Contactor
CC 2: Auxiliary Compressor Contactor
CCB: Control Circuit Breaker
CR: Compressor Relay
CG 1: Main Compressor Governor
CG 2: Auxiliary Compressor Governor
CCS: Control Changeover Switch
DL: Dropping Reactor
DVB: Drivers Brake Valve
DMH: Dead Man's Handle
EFR: Earth Fault Relay
EFRA 2: Earth Fault Relay for Auxiliary Circuit
EAC: Earthing Contactor
EAS: Earthing Switch
ELR: Emergency Lighting Relay
GS 1: Governor by Pass Switch for Control
GS 2: Governor by Pass Switch for Equipment
GS 3: Governor by Pass Switch for Main Compressor Governor
GS 4: Governor by Pass Switch for Auxiliary Compressor Governor
HEFRA 2: Switch for EFR A 2
HEFRA 1: Switch for EFR A 1
K1: Reversing Switch for TM 1 & 2
K2: Reversing Switch for TM 3 & 4
KF 1, KF 2: Radiator Fans
LA: Surge Diverter
LTR: Low Tension Proving Relay
M 1 to M 4: Motor Contactors
SBC: Static Battery Charger
BCFR: Battery Charger Failure Relay
MCS 1: Motor Cut Out Switch for TM 1/2
MCS 2: Motor Cut Out Switch for TM 3/4
MSWL: Motor Switch White Light
MC: Master Controller
NR 1, NR 2: Notching Relay
NVR: No Volt Relay
OL 1 to OL 4: Over Load Ready for TM 1 to 4
OL 5: Rectifier Over Load Protection Relay
OL 6: Transformer Over Lead Protection Relay
OLP: Over Load Primary Relay
OP: Oil Pump
RF: Rectifier Fan
RFR: Rectifier Fan Proving Relay
RFA: Rectifier Fan Auxiliary Relay
SL: Smoothening Reactor
SR: Starting Relay
T 1 to T 9: Tap Changing Contactors
TL: Tap Changing Reactor
TSS: Test Sequence Switch
TT: Transformer Thermostat
TTR: Transformer Thermostat Relay
W1: Winding Grouping
W2: Switch Contactors
WGR: Winding Grouping Relay
BR: Brake Relay
A: Ammeter

Additional EMU Components

AOVR: Auxiliary Over Voltage Relay
ARS: Ammeter Rotary Shunt
AS: Ammeter Shunt
EFRP: Earth Fault Relay Power
ETO: Earth
HEFRP: Switch for Earth Fault Relay Power
EFRA: Earth Fault Relay, Auxiliary Circuit
NC 1 to NC 4: Negative Contactors
HOBA: Earthing Switch for Battery
OVR: Over Veltage Relay
PFD: Permanent Field Divert Resistor
REFRP: Resistor For EFRP
ROVR: Series Resistor for OVR
RPP: Earth Resistor for EFRP
REFRA 1: Earth Resistor for EFRP Aux. 1
REFRA 2: Earth Resistor for EFRP Aux. 2
RHOBA: Resistor for Battery earthing switch
RPEFRA 1: Resistor for EFR Aux. 1
RPEFRA 2: Resistor for EFR Aux. 2
S: Speedometer
SH 1 to SH 4: Inductive Shunt for Motor 1 to Motor 4
SU: Surge Suppression Unit

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Test your knowledge on EMU components and their abbreviations with this quiz. Each question focuses on a specific component's code and its function. Perfect for students and professionals in electrical engineering!