Podcast
Questions and Answers
What are the two main classifications of relays mentioned in the content?
What are the two main classifications of relays mentioned in the content?
Shelf type and Plug-In Type.
Which style of relay is specified for use in internal circuits except in AC RE areas?
Which style of relay is specified for use in internal circuits except in AC RE areas?
QN1 Style Relay.
What is the working voltage of the QS3 Style Relay?
What is the working voltage of the QS3 Style Relay?
12 V DC.
How does the QB3 Relay ensure continued operation under high voltage conditions?
How does the QB3 Relay ensure continued operation under high voltage conditions?
Describe the configuration of the QNN1 Style Relay.
Describe the configuration of the QNN1 Style Relay.
What is unique about the AC Immunised DC neutral line Relay’s design?
What is unique about the AC Immunised DC neutral line Relay’s design?
What happens to the front contacts of the AC Immunised Relay when 1000 V AC is applied?
What happens to the front contacts of the AC Immunised Relay when 1000 V AC is applied?
What specification do all the mentioned relays conform to?
What specification do all the mentioned relays conform to?
What type of relay is QT2 and what is its primary usage?
What type of relay is QT2 and what is its primary usage?
Describe the significance of the copper slug in QTA2 relays.
Describe the significance of the copper slug in QTA2 relays.
What are the pickup voltage and current for QBAT relays?
What are the pickup voltage and current for QBAT relays?
How does the contact configuration differ between QT2 and QTA2 relays?
How does the contact configuration differ between QT2 and QTA2 relays?
What is the primary role of timer relays in signaling circuits?
What is the primary role of timer relays in signaling circuits?
What are the limitations regarding the track circuit lengths for QTA2 relays in RE areas?
What are the limitations regarding the track circuit lengths for QTA2 relays in RE areas?
What distinguishes QT2 relay construction compared to the shelf type relay?
What distinguishes QT2 relay construction compared to the shelf type relay?
In terms of operating power, how do QTA2 relays compare to QT2 relays?
In terms of operating power, how do QTA2 relays compare to QT2 relays?
What is the main function of the QNA1 relay?
What is the main function of the QNA1 relay?
How does the QBA1 relay achieve its immunity?
How does the QBA1 relay achieve its immunity?
What distinguishes the QBCA1 relay from the QBA1 relay?
What distinguishes the QBCA1 relay from the QBA1 relay?
Why is the QSPA1 relay specifically used as a repeater for certain track relays?
Why is the QSPA1 relay specifically used as a repeater for certain track relays?
What type of relay is the QL1 relay and how does it maintain its state?
What type of relay is the QL1 relay and how does it maintain its state?
What type of contact is required for track relays in non-electrified areas?
What type of contact is required for track relays in non-electrified areas?
What specifications must track relays comply with in electrified areas?
What specifications must track relays comply with in electrified areas?
What is the immunisation method used in QLB1, QBA1, and QSPA1 relays?
What is the immunisation method used in QLB1, QBA1, and QSPA1 relays?
What is a significant feature of the Minor Group relays in Siemens interlocking?
What is a significant feature of the Minor Group relays in Siemens interlocking?
List the configurations available for Non AC immunised Neutral Relays.
List the configurations available for Non AC immunised Neutral Relays.
What is the ohmic value of interlocked relays across all contact configurations?
What is the ohmic value of interlocked relays across all contact configurations?
How does the configuration of AC immunised relays differ from Non AC immunised relays?
How does the configuration of AC immunised relays differ from Non AC immunised relays?
What is the function of the Universal ECR relay in the context provided?
What is the function of the Universal ECR relay in the context provided?
Identify the contact configuration available for double coil relays mentioned in the content.
Identify the contact configuration available for double coil relays mentioned in the content.
What differentiates the WKR1 and WKR2 relays based on their specified configurations?
What differentiates the WKR1 and WKR2 relays based on their specified configurations?
What is the importance of the ohmic values provided for the relays?
What is the importance of the ohmic values provided for the relays?
What is the ohmic value of the relays used for point detection?
What is the ohmic value of the relays used for point detection?
What is the function of the WJR relay?
What is the function of the WJR relay?
What contact configurations are available for the WR (Heavy Duty contactor Relay)?
What contact configurations are available for the WR (Heavy Duty contactor Relay)?
What is the voltage requirement for the Siemens Motorised Clockwork Timer?
What is the voltage requirement for the Siemens Motorised Clockwork Timer?
What type of relays are approved for ECR applications?
What type of relays are approved for ECR applications?
What is the ECR pickup current at 50Hz?
What is the ECR pickup current at 50Hz?
What is the consequence of an interrupted energising circuit in a Siemens Timer?
What is the consequence of an interrupted energising circuit in a Siemens Timer?
What is the maximum continuous current the ECR can withstand?
What is the maximum continuous current the ECR can withstand?
What are the two primary components of the DC Thermal Type Element Relay (QJ1)?
What are the two primary components of the DC Thermal Type Element Relay (QJ1)?
What are the maximum operations recommended per day for the DC Thermal Type Element Relay, and why?
What are the maximum operations recommended per day for the DC Thermal Type Element Relay, and why?
Describe how the Electronic Timer Relays achieve time delays.
Describe how the Electronic Timer Relays achieve time delays.
List the group classifications for K-50 relays and provide an example of what is included in a Mini Group.
List the group classifications for K-50 relays and provide an example of what is included in a Mini Group.
What happens to the timing in a DC Thermal Type Element Relay if there is a 10% increase in applied voltage?
What happens to the timing in a DC Thermal Type Element Relay if there is a 10% increase in applied voltage?
Flashcards
QNA1 Relay
QNA1 Relay
An interface relay in Electronic Interlocking systems, immunized by a copper slug on its core.
QBA1 Relay
QBA1 Relay
A DC biased AC immune neutral line relay, immunized using a copper slug and biased by a permanent magnet.
QBCA1 Relay
QBCA1 Relay
A relay similar to QBA1, but with two heavy-duty front contacts capable of carrying 30A inductive current.
QSPA1 Relay
QSPA1 Relay
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QL1 Relay
QL1 Relay
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Track Relays (Metal-to-Carbon)
Track Relays (Metal-to-Carbon)
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Non-electrified area track relays
Non-electrified area track relays
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Electrified area track relays
Electrified area track relays
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Relay Working Principle
Relay Working Principle
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Relay Types
Relay Types
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QN1 Relay Use
QN1 Relay Use
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QS3 Relay Type
QS3 Relay Type
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QB3 Relay Feature
QB3 Relay Feature
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QNN1 Relay Structure
QNN1 Relay Structure
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AC Immunized DC Neutral Line Relay
AC Immunized DC Neutral Line Relay
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Relay Components
Relay Components
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DC Thermal Type Element Relay
DC Thermal Type Element Relay
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Electronic Timer Relay
Electronic Timer Relay
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K-50 Relay Groups
K-50 Relay Groups
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DC Thermal Relay Voltage Rating
DC Thermal Relay Voltage Rating
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Relay Operation Limit
Relay Operation Limit
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Relay Usage in RE areas
Relay Usage in RE areas
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Timer Relays
Timer Relays
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Track Circuit Lengths
Track Circuit Lengths
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Choke Placement
Choke Placement
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Traction Return Current
Traction Return Current
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Neutral Relays (Minor Group)
Neutral Relays (Minor Group)
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Interlocked Relays (Major Group)
Interlocked Relays (Major Group)
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Signal Group Types
Signal Group Types
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Non-AC Immunized Relays
Non-AC Immunized Relays
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AC Immunized Relays (Top)
AC Immunized Relays (Top)
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Double Coil Relays (Z1WR type)
Double Coil Relays (Z1WR type)
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Universal ECR Relay
Universal ECR Relay
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Ohmic value of relays (Point Minor/Major group)
Ohmic value of relays (Point Minor/Major group)
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Relay contact configurations
Relay contact configurations
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Relay function for point detection
Relay function for point detection
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Relay for point operation timing (duration)
Relay for point operation timing (duration)
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Relay for point motor operation
Relay for point motor operation
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Siemens Motorised Clockwork Timer Relay usage
Siemens Motorised Clockwork Timer Relay usage
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ECR Relay pickup current
ECR Relay pickup current
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ECR Relay drop-away current
ECR Relay drop-away current
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Study Notes
Relays for Railway Signalling
- Relays are electromagnetic devices used to close or open electrical circuits.
- They can be shelf type or plug-in type.
- They operate on an electromagnetic principle, using a base electromagnet, armature, contacts, springs, and a cover.
- Relays operate on low current.
Metal to Carbon Line Relay - Non- AC Immunized Relays
-
QN1 Style Relay: Used in internal control and detection circuits (except AC areas).
-
Immune to 300V AC 50Hz (except in emergencies in AC areas).
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Specification BRS No: 930A
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QS3 Style Relay: Sensitive line relay, operating on 12VDC.
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Specification BRS No: 930A
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QB3 Relay: Biased neutral line relay, operating on 12VDC.
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Contact configuration 4F/2B. Biasing up to 240VDC.
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Specification BRS No: 930A
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QNN1 Style Relay: Comprises two neutral line relays.
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Contacts and magnets are mounted side-by-side.
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They operate independently.
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Specification is BR specification 960.
Metal- Carbon - AC Immunised Q- style line relays
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AC Immunised DC neutral line Relay: Immunisation is intrinsic, without external components.
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Does not make any front contacts with 1000V (rms) 50Hz AC applied to terminals.
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Does not break any back contacts with 300V (rms) 50Hz AC applied to terminals.
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Confirmation with IRS Specification No. S60 -78.
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Usage in Electronic Interlocking systems.
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QNA1 Relay: Immunisation achieved through a copper slug on the coil core.
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Otherwise similar to QN1.
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Specification BR specification no. 931A
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External relay usage.
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QBA1 Relay: DC biased AC immune neutral line relay.
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Copper slug for immunisation, permanent magnet for biasing.
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Does not operate if 20 times rated voltage is applied in reverse direction.
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Specification BR Specification No. 932A
Track Relays
- Track relays are typically metal to carbon contact type, usually plug-in type, unless otherwise specified in non-electrified or electrified areas
- Resistances vary depending on the area and type of relay.
- Relays such as QT2, QTA2 and QBAT are commonly used in track circuit applications.
Timer Relays
- Used in signalling circuits for releasing interlocking after set time periods for safety.
- Types include DC Thermal (QJ1), Siemens motorized clockwork, motor type, and electronic types.
Metal to Metal Relays
- K-50 relays: Available in mini, minor, and major groups; varying capacities based on size.
- Used in various point control applications (interlocking, etc.)
ECR Relays
- Relays of approved type.
- Plug-in type relays (Neutral/Polar Biased/Magnetic latch/Interlocked) rated at 24, 48 or 60 VDC are normally used.
- Suitable LED lamp proving relays are used to suit various LED lamps.
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Description
Explore the essential functions and types of relays used in railway signalling systems. This quiz covers electromagnetic principles, various relay styles, and their specifications, focusing on both AC and DC applications. Test your understanding of how these components ensure the safe operation of railway circuits.