Podcast
Questions and Answers
What does the signal word 'WARNING' indicate?
What does the signal word 'WARNING' indicate?
Which signal word suggests a risk of minor or moderate injury?
Which signal word suggests a risk of minor or moderate injury?
What is the purpose of embedded warnings?
What is the purpose of embedded warnings?
Which of the following correctly describes 'DANGER' as a signal word?
Which of the following correctly describes 'DANGER' as a signal word?
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Which action is indicated by the warning format?
Which action is indicated by the warning format?
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What outcome does the notice signal word focus on preventing?
What outcome does the notice signal word focus on preventing?
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Which component is used for securing the protective cover on the RS 2001 protective relay?
Which component is used for securing the protective cover on the RS 2001 protective relay?
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What connection does the protective relays RS 2003 and RS 2004 use in place of the cable gland?
What connection does the protective relays RS 2003 and RS 2004 use in place of the cable gland?
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What should be done if the tap position indicator on the motor-drive unit and the on-load tap-changer differ?
What should be done if the tap position indicator on the motor-drive unit and the on-load tap-changer differ?
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Where is the nameplate located on the protective relay?
Where is the nameplate located on the protective relay?
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Which test button is used for the operation reset on the RS 2001 protective relay?
Which test button is used for the operation reset on the RS 2001 protective relay?
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What action is recommended if there is no audible switch action from the motor-drive unit?
What action is recommended if there is no audible switch action from the motor-drive unit?
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What is the purpose of the pressure equalization element in the protective relay?
What is the purpose of the pressure equalization element in the protective relay?
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In case of a red message on the monitoring unit, what should be done first?
In case of a red message on the monitoring unit, what should be done first?
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Which feature is included in the connection terminal design of the protective relay?
Which feature is included in the connection terminal design of the protective relay?
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What should be checked if noises occur from the drive shaft during tap position changes?
What should be checked if noises occur from the drive shaft during tap position changes?
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Who should be contacted if there is a warning or tripping of the Buchholz relay on the transformer?
Who should be contacted if there is a warning or tripping of the Buchholz relay on the transformer?
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Which part is not present in the protective relay RS 2001 as depicted in the figure?
Which part is not present in the protective relay RS 2001 as depicted in the figure?
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What does a deviation from desired values during dissolved gas analysis indicate?
What does a deviation from desired values during dissolved gas analysis indicate?
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Which component is positioned directly below the operation reset test button in the RS 2001 protective relay?
Which component is positioned directly below the operation reset test button in the RS 2001 protective relay?
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If the fill level has fallen below limit values, what is the immediate action required?
If the fill level has fallen below limit values, what is the immediate action required?
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What is the proper procedure if tap-changer keys are not functioning?
What is the proper procedure if tap-changer keys are not functioning?
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What is the appropriate oil filter unit recommended for on-load tap-changers with more than 15,000 tap-change operations per year?
What is the appropriate oil filter unit recommended for on-load tap-changers with more than 15,000 tap-change operations per year?
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In tropical or subtropical climates, what type of filter insert must be used to maintain the dielectric properties of the insulating fluid?
In tropical or subtropical climates, what type of filter insert must be used to maintain the dielectric properties of the insulating fluid?
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What is the specified action to avoid when commissioning the on-load tap-changer due to the danger of explosion?
What is the specified action to avoid when commissioning the on-load tap-changer due to the danger of explosion?
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If the highest operating voltage between phases of the on-load tap-changer exceeds 55 kV in high humidity conditions, which filter insert is required?
If the highest operating voltage between phases of the on-load tap-changer exceeds 55 kV in high humidity conditions, which filter insert is required?
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What potential hazards are associated with the oil compartment of the on-load tap-changer?
What potential hazards are associated with the oil compartment of the on-load tap-changer?
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What maintenance advantage does the OF 100 oil filter unit provide for on-load tap-changers?
What maintenance advantage does the OF 100 oil filter unit provide for on-load tap-changers?
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Which of the following conditions makes the use of a combined filter insert especially necessary?
Which of the following conditions makes the use of a combined filter insert especially necessary?
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Which of the following is a critical safety warning for working with on-load tap-changers?
Which of the following is a critical safety warning for working with on-load tap-changers?
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What is the primary role of an electrically trained person?
What is the primary role of an electrically trained person?
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What responsibility does the operating company have towards the operator?
What responsibility does the operating company have towards the operator?
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What is advised regarding maintenance of the product?
What is advised regarding maintenance of the product?
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Who qualifies as authorized personnel for maintenance tasks?
Who qualifies as authorized personnel for maintenance tasks?
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What should personnel ensure regarding personal protective equipment?
What should personnel ensure regarding personal protective equipment?
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What action must personnel take if their personal protective equipment is damaged?
What action must personnel take if their personal protective equipment is damaged?
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What should personnel do if maintenance is not performed by Technical Service?
What should personnel do if maintenance is not performed by Technical Service?
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In a work area, what is crucial regarding information about personal protective equipment?
In a work area, what is crucial regarding information about personal protective equipment?
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The transformer should be energized during the protective relay functionality check.
The transformer should be energized during the protective relay functionality check.
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It is necessary to deactivate the automatic fire extinguishing device before testing the protective relay.
It is necessary to deactivate the automatic fire extinguishing device before testing the protective relay.
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The OFF test button is pressed after the circuit breaker is closed during the protective relay testing.
The OFF test button is pressed after the circuit breaker is closed during the protective relay testing.
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Grounding the transformer on the high-voltage side must be removed during the test to check the protective relay.
Grounding the transformer on the high-voltage side must be removed during the test to check the protective relay.
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The protective relay functionality check includes leaving the danger zone before pressing the OPERATION test button.
The protective relay functionality check includes leaving the danger zone before pressing the OPERATION test button.
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After pressing the OPERATION test button, the transformer can be closed with all isolating switches open.
After pressing the OPERATION test button, the transformer can be closed with all isolating switches open.
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The terminal box cover is removed before pressing the OFF test button in the testing process.
The terminal box cover is removed before pressing the OFF test button in the testing process.
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The procedure for testing involves loosening three screws on the terminal box cover only once.
The procedure for testing involves loosening three screws on the terminal box cover only once.
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The flap valve should be in the INACTIVE position before checking the protective relay.
The flap valve should be in the INACTIVE position before checking the protective relay.
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Grounding the transformer on both the high-voltage and low-voltage sides is unnecessary during pressure monitoring device checks.
Grounding the transformer on both the high-voltage and low-voltage sides is unnecessary during pressure monitoring device checks.
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The automatic fire extinguishing device should be left activated during testing.
The automatic fire extinguishing device should be left activated during testing.
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The sensor on the snap-action switch is in the OPERATION position after it's activated during pressure testing.
The sensor on the snap-action switch is in the OPERATION position after it's activated during pressure testing.
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In the active protection test, it is required for the transformer's circuit breaker to be closed.
In the active protection test, it is required for the transformer's circuit breaker to be closed.
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The snap-action switch sensor should be activated multiple times during the commissioning process.
The snap-action switch sensor should be activated multiple times during the commissioning process.
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It is acceptable to remove the grounding for work connection on the transformer during testing.
It is acceptable to remove the grounding for work connection on the transformer during testing.
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It is essential to leave the transformer's danger zone prior to commencing active protection tests.
It is essential to leave the transformer's danger zone prior to commencing active protection tests.
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Ignition sources such as open flames must be present when handling the on-load tap-changer head cover.
Ignition sources such as open flames must be present when handling the on-load tap-changer head cover.
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It is safe to operate electrical devices while removing the on-load tap-changer head cover.
It is safe to operate electrical devices while removing the on-load tap-changer head cover.
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The transformer can be energized immediately after a protective relay trips without inspection.
The transformer can be energized immediately after a protective relay trips without inspection.
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A protective relay tripping may indicate that the on-load tap-changer has sustained damage.
A protective relay tripping may indicate that the on-load tap-changer has sustained damage.
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Condensate in the protective housing of the motor-drive unit can cause damage.
Condensate in the protective housing of the motor-drive unit can cause damage.
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It is recommended to de-energize all auxiliary circuits before removing the tap-changer head cover.
It is recommended to de-energize all auxiliary circuits before removing the tap-changer head cover.
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The 'NOTICE' signal word indicates an imminent risk of physical harm.
The 'NOTICE' signal word indicates an imminent risk of physical harm.
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All sources of ignition must be eliminated in the area surrounding the on-load tap-changer.
All sources of ignition must be eliminated in the area surrounding the on-load tap-changer.
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The flap valve of the protective relay can remain in the OFF position indefinitely after tripping.
The flap valve of the protective relay can remain in the OFF position indefinitely after tripping.
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It is important to block the motor-drive unit to prevent the on-load tap-changer from being actuated remotely.
It is important to block the motor-drive unit to prevent the on-load tap-changer from being actuated remotely.
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If insulating fluid is leaking, it is necessary to close the valve on the oil conservator immediately.
If insulating fluid is leaking, it is necessary to close the valve on the oil conservator immediately.
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The first action to take when a protective relay is tripped is to determine the operating position of the motor-drive unit.
The first action to take when a protective relay is tripped is to determine the operating position of the motor-drive unit.
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Prior to inspecting the on-load tap-changer, confirming that the transformer can be started is essential.
Prior to inspecting the on-load tap-changer, confirming that the transformer can be started is essential.
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If unable to clarify why the protective relay tripped, one should contact Maschinenfabrik Reinhausen for assistance.
If unable to clarify why the protective relay tripped, one should contact Maschinenfabrik Reinhausen for assistance.
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Establishing the time of tripping is the last step in the procedure after circuit breakers trip.
Establishing the time of tripping is the last step in the procedure after circuit breakers trip.
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A fault in the tripping circuit is indicated if the flap valve is found in the OFF position.
A fault in the tripping circuit is indicated if the flap valve is found in the OFF position.
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An emergency operation is necessary when a transformer is de-energized and a fault is detected in the motor-drive unit.
An emergency operation is necessary when a transformer is de-energized and a fault is detected in the motor-drive unit.
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The hand crank interlock switch interrupts the control circuit when the hand crank is inserted.
The hand crank interlock switch interrupts the control circuit when the hand crank is inserted.
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Damage to the on-load tap-changer can occur if the tap-change operation is not completed correctly.
Damage to the on-load tap-changer can occur if the tap-change operation is not completed correctly.
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The pointer of the tap-change indicator must not circle fully for the operation to be considered complete.
The pointer of the tap-change indicator must not circle fully for the operation to be considered complete.
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After using the hand crank, it should be returned to its original mounting bracket.
After using the hand crank, it should be returned to its original mounting bracket.
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The motor protective switch should be switched on before inserting the hand crank.
The motor protective switch should be switched on before inserting the hand crank.
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A tap-change operation can be performed without opening the door of the protective housing.
A tap-change operation can be performed without opening the door of the protective housing.
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The proper position of the pointer on the tap-change indicator is marked in gray.
The proper position of the pointer on the tap-change indicator is marked in gray.
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The protective relay can be checked while the transformer is in an energized state.
The protective relay can be checked while the transformer is in an energized state.
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The automatic fire extinguishing device should be inactive before testing the protective relay.
The automatic fire extinguishing device should be inactive before testing the protective relay.
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Grounding the transformer on the high-voltage side must be maintained throughout the testing process.
Grounding the transformer on the high-voltage side must be maintained throughout the testing process.
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After pressing the OFF test button, the circuit breaker can be closed while the transformer remains grounded.
After pressing the OFF test button, the circuit breaker can be closed while the transformer remains grounded.
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The terminal box cover is the last component to be removed during the protective relay testing sequence.
The terminal box cover is the last component to be removed during the protective relay testing sequence.
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The OFF test button must be pressed before removing the terminal box cover from the transformer.
The OFF test button must be pressed before removing the terminal box cover from the transformer.
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To reset the protective relay, the OPERATION test button is pressed after the transformer has been closed.
To reset the protective relay, the OPERATION test button is pressed after the transformer has been closed.
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It is sufficient to only check the protective relay on the high-voltage side for a thorough functionality check.
It is sufficient to only check the protective relay on the high-voltage side for a thorough functionality check.
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Wearing loose clothing is a method to reduce the risk of injury when working with machinery.
Wearing loose clothing is a method to reduce the risk of injury when working with machinery.
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Personal protective equipment must be worn even if it is damaged.
Personal protective equipment must be worn even if it is damaged.
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Maintaining a clean and illuminated work area is crucial for safety.
Maintaining a clean and illuminated work area is crucial for safety.
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It is acceptable to operate a product that shows signs of unreliability without inspection.
It is acceptable to operate a product that shows signs of unreliability without inspection.
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Wearing jewelry, such as rings and necklaces, is recommended while operating machinery.
Wearing jewelry, such as rings and necklaces, is recommended while operating machinery.
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Regular checks on safety equipment are unnecessary if the equipment appears to be functioning properly.
Regular checks on safety equipment are unnecessary if the equipment appears to be functioning properly.
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If long hair is present, it is necessary to secure it with a hairnet for safety.
If long hair is present, it is necessary to secure it with a hairnet for safety.
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Observing the laws for accident prevention in the relevant country is optional for workplace safety.
Observing the laws for accident prevention in the relevant country is optional for workplace safety.
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Tripping of the pressure monitoring device requires contacting MR for assistance.
Tripping of the pressure monitoring device requires contacting MR for assistance.
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If the on-load tap-changer is tripped, no further checks on the transformer are needed.
If the on-load tap-changer is tripped, no further checks on the transformer are needed.
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Measurements must be taken on the transformer if the protective relay is tripped.
Measurements must be taken on the transformer if the protective relay is tripped.
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The action for tripping the protective relay does not involve re-commissioning the transformer.
The action for tripping the protective relay does not involve re-commissioning the transformer.
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Tripping of the pressure relief device is solely a mechanical failure and requires no electrical checks.
Tripping of the pressure relief device is solely a mechanical failure and requires no electrical checks.
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The email address for technical service inquiries at Maschinenfabrik Reinhausen GmbH is [email protected].
The email address for technical service inquiries at Maschinenfabrik Reinhausen GmbH is [email protected].
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The fax number for Maschinenfabrik Reinhausen GmbH is +49 9 41 40 90-7001.
The fax number for Maschinenfabrik Reinhausen GmbH is +49 9 41 40 90-7001.
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In case of issues with the protective relay, only local personnel are required to perform checks without contacting MR.
In case of issues with the protective relay, only local personnel are required to perform checks without contacting MR.
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The flap valve in the OFF position indicates a fault in the tripping circuit.
The flap valve in the OFF position indicates a fault in the tripping circuit.
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The first step after a circuit breaker gets tripped is to check for insulating fluid leakage.
The first step after a circuit breaker gets tripped is to check for insulating fluid leakage.
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The motor protective switch should remain active to allow remote control of the on-load tap-changer.
The motor protective switch should remain active to allow remote control of the on-load tap-changer.
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Maschinenfabrik Reinhausen must always be contacted if the reason for the protective relay tripping cannot be identified.
Maschinenfabrik Reinhausen must always be contacted if the reason for the protective relay tripping cannot be identified.
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The insulating fluid leakage should be addressed by closing the oil conservator stop valve immediately.
The insulating fluid leakage should be addressed by closing the oil conservator stop valve immediately.
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The automatic reset mechanism of the protective relay means that the flap valve remains in the OFF position after tripping.
The automatic reset mechanism of the protective relay means that the flap valve remains in the OFF position after tripping.
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If the transformer has tripped the relay, it is safe to start it up under any circumstances.
If the transformer has tripped the relay, it is safe to start it up under any circumstances.
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When the flap valve is in the OPERATION position, checking the tripping circuit should be the next step.
When the flap valve is in the OPERATION position, checking the tripping circuit should be the next step.
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It is safe to use the transformer if the on-load tap-changer has not been tested after the pressure monitoring device has been tripped.
It is safe to use the transformer if the on-load tap-changer has not been tested after the pressure monitoring device has been tripped.
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Re-commissioning the transformer can begin immediately after the protective relay has tripped.
Re-commissioning the transformer can begin immediately after the protective relay has tripped.
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It is important to contact Maschinenfabrik Reinhausen to check the integrity of the transformer after the pressure monitoring device has been activated.
It is important to contact Maschinenfabrik Reinhausen to check the integrity of the transformer after the pressure monitoring device has been activated.
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Before putting the transformer back into operation, it is necessary to ensure there was no load on the transformer at the moment of tripping.
Before putting the transformer back into operation, it is necessary to ensure there was no load on the transformer at the moment of tripping.
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Protective devices of the transformer should not have responded at the moment of tripping for the transformer to be safely recommissioned.
Protective devices of the transformer should not have responded at the moment of tripping for the transformer to be safely recommissioned.
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All switching operations in the network can be ignored when analyzing the causes of the transformer tripping.
All switching operations in the network can be ignored when analyzing the causes of the transformer tripping.
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Overvoltages recorded at the moment of the transformer tripping are irrelevant for further diagnosis.
Overvoltages recorded at the moment of the transformer tripping are irrelevant for further diagnosis.
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It is advised to test the protective relay and transformer before considering the transformer safe to operate again.
It is advised to test the protective relay and transformer before considering the transformer safe to operate again.
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Study Notes
Warning Information
- Warnings relate to specific dangers and associated actions to avoid hazards.
- Embedded warnings focus on particular information sections, highlighting specific dangers.
- Signal words indicate the severity of hazards:
- DANGER: Imminent risk of death or severe injury.
- WARNING: Potential risk of death or severe injury if not addressed.
- CAUTION: Risk of minor to moderate injury if not managed.
- NOTICE: Measures to prevent property damage.
Operator Responsibilities
- Operators must follow instructions from the technical file for safe product operation.
- Operating companies are responsible for providing adequate training regarding potential dangers.
Maintenance Recommendations
- Maintenance, repairs, and retrofitting are best performed by the manufacturer's Technical Service department to ensure safety and compliance.
- Unauthorized personnel must have appropriate training and authorization for maintenance tasks.
Personal Protective Equipment (PPE)
- Always wear required PPE to minimize health risks.
- Do not use damaged PPE, and follow information about PPE provided in the work area.
Product Description
- Components of protective relays include gaskets, terminal boxes, buttons for operational testing, and pressure equalization elements.
- Models RS 2003 and RS 2004 feature a 1/2"-14NPT adapter instead of a cable gland.
Nameplate and On-load Tap-changer Recommendations
- The nameplate is located on the back of the protective relay.
- High-frequency tap-change operations (>15,000/year) should use the OF 100 oil filter unit for extended maintenance intervals.
- In humid tropical climates, the OF 100 oil filter with combined filter insert is recommended for maintaining dielectric properties in insulating fluid.
Commissioning and Explosion Risks
- Warning for potential explosion due to explosive gases in oil compartments, pipes, and systems.
- Ensure no ignition sources are present during commissioning to prevent deflagration or explosions.
Fault Elimination Procedures
- In case of a red message on the monitoring unit, read out the database and send it along with the error code to the manufacturer.
- For any warnings or trips from the Buchholz relay on the transformer, notify the transformer manufacturer.
- Deviations in winding resistance or dissolved gas analysis should also be referred to the transformer manufacturer for action.
Checking Protective Relay (Models RS 2001, 2004)
- Verify protective relay functionality before commissioning a transformer.
- Ground both high-voltage and low-voltage sides continuously during testing.
- Ensure the transformer is de-energized throughout the testing process.
- Disable the automatic fire extinguishing device prior to testing.
Steps for Protective Relay Testing (RS 2001 Series)
- Remove the terminal box cover after loosening screws and detaching the potential tie-in screw.
- Perform passive protection test by pressing "OFF" test button and ensuring the circuit breaker remains open.
- Conduct active protection test by pressing "OPERATION" test button and resetting the relay after ensuring the circuit breaker is properly configured.
Steps for Protective Relay Testing (RS 2004)
- Confirm that the flap valve is set to the OPERATION position before commencing.
- Close the circuit breaker with isolating switches open while ensuring ground connections are intact.
- Conduct active protection test to verify that the circuit breaker remains open after pressing the "OFF" test button.
Checking Pressure Monitoring Device
- Ground both high-voltage and low-voltage sides and keep the transformer de-energized during the check.
- Remove the cover cap and activate the sensor on the snap-action switch to check its OFF position.
- Repeat process for the OPERATION position and ensure circuit breaker remains open for both active and passive protection tests.
Emergency Operation Protocol
- Emergency operation is permitted for necessary tap-change actions while the transformer is energized, despite motor-drive unit faults.
- Exercise caution and adherence to warnings during emergency operations to avoid further complications.
Operating Motor-Drive Unit with Hand Crank
- Open the protective housing door and switch off the motor protective switch (Q1).
- Utilize the hand crank by inserting it into the designated aperture and rotating until the tap-change indicator is back to mid-position.
- Ensure the tap-change operation is complete before removing the hand crank and resuming normal switch operation.
Fault Elimination Procedures
- Hazard of explosion from explosive gases requires strict controls: eliminate ignition sources and de-energize all auxiliary circuits prior to maintenance.
- Inspect transformer and on-load tap-changer after protective devices have tripped; do not energize until confirmed safe.
- In case of tripping, ascertain the timing and the operational state of the on-load tap-changer.
Inspecting On-Load Tap-Changer
- Check the on-load tap-changer head cover for leaks and close the oil conservator stop valve if necessary.
- Monitor the flap valve position—off indicates potential issues in the tripping circuit, while operation may suggest different faults.
- Contact Maschinenfabrik Reinhausen for advanced troubleshooting if the reason for tripping remains unclear.
Fundamental Safety Instructions
- Personal protective equipment (PPE) is essential for safety during transport, installation, maintenance, and disposal activities.
- Appropriate PPE includes helmets, work gloves, and other relevant gear; damaged PPE must never be used.
- Avoid wearing loose clothing or jewelry to prevent entanglement in machinery; long hair should be secured with a hairnet.
Work Area Safety
- Maintain clean and organized work areas to minimize accident risks.
- Ensure the work area is well-lit and adheres to accident prevention laws specific to the operational region.
Operational Safety
- Only operate equipment in sound and operational condition to prevent hazards.
- Regularly verify the functionality of safety equipment.
- Follow prescribed inspection and maintenance routines as outlined in the technical documentation.
Checking Protective Relay
- Functionality checks for protective relays (models RS 2001, etc.) must be performed before transformer commissioning.
- Ground both the high-voltage and low-voltage sides of the transformer during testing.
- Ensure the transformer remains de-energized and disable the automatic fire extinguishing system during checks.
Commissioning Procedures
- Follow specific steps when commissioning the transformer, including removing terminal box covers and conducting passive and active protection tests.
- Ensure the transformer is properly grounded and that operational tests are conducted with isolating switches open.
Fault Elimination
- If the protective relay or pressure monitoring device trips, consult troubleshooting protocols.
- Document the time of tripping and the operating position of the on-load tap-changer for diagnostics.
- Check for leaks in insulating fluid and ensure the protective relay's flap valve position is correct to determine issues.
Communication with Service Provider
- Always contact Maschinenfabrik Reinhausen for inspections and to address faults in the on-load tap-changer or transformer.
- Gather necessary details about the operating conditions at the time of any tripping events for effective troubleshooting and repair.
- Ensure thorough testing and verification before resuming operation after any incident involving abnormal shutdown or tripping of protective devices.
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Description
This quiz explores the concept of embedded warnings within sections, detailing the types of dangers they signal. Participants will learn about the source of these dangers, potential outcomes, and appropriate actions to take. Enhance your knowledge of warning structures and their implications in documentation.
