VACUTAP RMV-II On-load Tap-changers Replacement Procedures

Questions and Answers

What is the diameter of the roller pin in the helical gear of on-load tap-changers type VACUTAP RMV-II?

10 mm (correct)

15 mm

20 mm

5 mm

When should the front Geneva wheel be replaced in on-load tap-changers type VACUTAP RMV-II?

During General Standard Maintenance

After 500,000 tap-change operations

After 1,000,000 tap-change operations (correct)

After 2,000,000 tap-change operations

What is the recommended action if the helical gear was replaced during an Intermediate Maintenance?

Replace the helical gear again during the next General Standard Maintenance (correct)

Do nothing, as the helical gear is already replaced

Replace the helical gear again during the next Intermediate Maintenance

Perform an additional inspection after 500,000 tap-change operations

Which of the following on-load tap-changers type VACUTAP RMV-II requires the replacement of two bolts at the P connection?

VACUTAP RMV-II delivered between September 2019 and February 2020 Signup and view all the answers

What is the first step in the procedure of inspection and replacement of the two bolts at the P connection?

Make sure that the high and low side breakers are open and xfmr grounded Signup and view all the answers

What is the production period for which the replacement of two bolts at the P connection is required?

2019-09-01 to 2020-02-28 Signup and view all the answers

What type of maintenance is recommended for replacing the helical gear if it was replaced during an Intermediate Maintenance?

General Standard Maintenance Signup and view all the answers

What is the reason for replacing the helical gear with 10 mm roller pin in on-load tap-changers type VACUTAP RMV-II?

After a certain number of tap-change operations Signup and view all the answers

What is the approximated time required for switching from tap position n to n+1?

2000 ms Signup and view all the answers

Which points are directly connected in the switching sequence?

P1 and P2 Signup and view all the answers

What is the purpose of CT in the switching sequence?

To measure current Signup and view all the answers

Which of the following is NOT a part of the switching sequence?

Ground Signup and view all the answers

What is the relationship between tap n and tap n+1?

Tap n is adjacent to tap n+1 Signup and view all the answers

What is the function of P2 and P3 in the switching sequence?

To connect tap n and tap n+1 Signup and view all the answers

What is the purpose of VI in the switching sequence?

To measure voltage Signup and view all the answers

What is the type of reactor in the switching sequence?

OLTC VACUTAP RMV Signup and view all the answers

In the given switching sequence diagram, what is the primary function of the component labeled 'IL'?

To measure the current flowing through the reactor. Signup and view all the answers

What does the abbreviation 'OLTC' stand for in the context of the given diagram?

On-Load Tap Changer Signup and view all the answers

In the diagram, the component labeled 'VI' is most likely a:

Voltage Indicator Signup and view all the answers

According to the diagram, what is the approximate duration of each phase in the switching sequence from tap position 'n' to 'n+1'?

2000 milliseconds Signup and view all the answers

The component labeled 'CT' in the diagram is most likely a:

Current Transformer Signup and view all the answers

What is the primary function of the switching sequence described in the diagram?

To adjust the voltage level of the transformer. Signup and view all the answers

What is the name of the type of transformer used in the diagram?

Autotransformer Signup and view all the answers

The switching sequence described in the diagram is for moving from tap position 'n' to 'n+1.' What does 'n+1' likely represent?

A higher voltage tap position. Signup and view all the answers

What does the cam position indicate when the UVT-LTX is in Neutral?

The Delta mark on the cam is on the bottom Signup and view all the answers

In the switching sequence of the Reactor Type OLTC VACUTAP® RMV, which is the initial tap position when moving from tap position n to n+1?

Tap position P1 Signup and view all the answers

What time duration is approximately indicated for each step in the switching sequence?

2000 ms Signup and view all the answers

In the context of the switching sequence, what does 'Non-Bridging Position' refer to?

Position with no connection between taps Signup and view all the answers

What is the sequence identifier for the RMV Switching Sequence mentioned in the content?

Switching Sequence of Reactor Type OLTC_2011 Signup and view all the answers

Which term is used to describe the time elapsed during the transition between tap positions in the sequence?

Transition Interval Signup and view all the answers

What component is specifically excluded from the switching sequence diagram provided?

Bypass features Signup and view all the answers

What is the key function of the Reactor Type OLTC VACUTAP® RMV in this context?

To facilitate rapid switching Signup and view all the answers

What is the approximate time duration for the switching sequence from tap position n+1 to n in the reactor type OLTC VACUTAP® RMV?

2000 ms Signup and view all the answers

What does the "AIW" label represent in the diagram illustrating the switching sequence?

Automatic Interlocking Mechanism Signup and view all the answers

Which of the following components is NOT directly involved in the switching sequence from tap position n+1 to n?

VI (Voltage Indicator) Signup and view all the answers

What is the likely function of the "P" components labelled in the diagram?

Pressure contacts that establish the electrical connection during switching Signup and view all the answers

Based on the diagram, what is the likely function of the "Ic" component?

Control Current Signup and view all the answers

During the switching sequence, what is the most likely reason for the involvement of "IL" (Inductive Load)?

To provide a path for the current during the transition between tap positions Signup and view all the answers

What is the likely purpose of the "Bridging Position" in the switching sequence?

To ensure a smooth transition of current from one tap to the next Signup and view all the answers

What is the key difference between the two diagrams provided, representing the switching sequence?

The first diagram shows the sequence with an additional component labelled "AIW", while the second does not Signup and view all the answers

Study Notes

Replacement Procedures for VACUTAP® RMV-II On-load Tap-changers

All VACUTAP® RMV-II on-load tap-changers produced from January 26, 2017, feature a helical gear equipped with a 10 mm roller pin.
The helical gear and the front Geneva wheel must be replaced after 1,000,000 tap-change operations.
If the helical gear is replaced during Intermediate Maintenance, it is advisable to replace it again during the next General Standard Maintenance to maintain consistent maintenance timelines.

Inspection and Replacement of Bolts

Inspection and replacement of two bolts at the P connection is required for VACUTAP® RMV-II tap-changers delivered between September 2019 and February 2020.
Applicable models for bolt replacement include VACUTAP RMV-II 600A and 1,000A at voltages of 15 and 26.4kV.
Ensure high and low side breakers are open and that the transformer is grounded before beginning servicing.

Switching Sequence for VACUTAP® RMV

The switching sequence for reactor type OLTC VACUTAP® RMV operates from tap position n to n+1 within approximately 2000 ms.
Key components involved in the switching include P1, P2, P3, P4, and their respective current and voltage indicators.
The system can transition from a non-bridging to a bridging position, highlighting the intricate functioning of the VACUTAP® RMV switching mechanism.

Maintenance Recommendations

Consistent documentation of replacements in the service report is essential for tracking the maintenance schedule of tap-changers and adhering to operational standards.
The maintenance of on-load tap-changers is crucial to ensure optimal performance and longevity, following precise operational guidelines.

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Description

Learn about the replacement procedures for VACUTAP RMV-II on-load tap-changers, including when to replace the helical gear and front Geneva wheel. Understand the maintenance timelines and guidelines for optimal performance.

VACUTAP RMV-II On-load Tap-changers Replacement Procedures

Questions and Answers

What is the diameter of the roller pin in the helical gear of on-load tap-changers type VACUTAP RMV-II?

When should the front Geneva wheel be replaced in on-load tap-changers type VACUTAP RMV-II?

What is the recommended action if the helical gear was replaced during an Intermediate Maintenance?

Which of the following on-load tap-changers type VACUTAP RMV-II requires the replacement of two bolts at the P connection?

What is the first step in the procedure of inspection and replacement of the two bolts at the P connection?

What is the production period for which the replacement of two bolts at the P connection is required?

What type of maintenance is recommended for replacing the helical gear if it was replaced during an Intermediate Maintenance?

What is the reason for replacing the helical gear with 10 mm roller pin in on-load tap-changers type VACUTAP RMV-II?

What is the approximated time required for switching from tap position n to n+1?

Which points are directly connected in the switching sequence?

What is the purpose of CT in the switching sequence?

Which of the following is NOT a part of the switching sequence?

What is the relationship between tap n and tap n+1?

What is the function of P2 and P3 in the switching sequence?

What is the purpose of VI in the switching sequence?

What is the type of reactor in the switching sequence?

In the given switching sequence diagram, what is the primary function of the component labeled 'IL'?

What does the abbreviation 'OLTC' stand for in the context of the given diagram?

In the diagram, the component labeled 'VI' is most likely a:

According to the diagram, what is the approximate duration of each phase in the switching sequence from tap position 'n' to 'n+1'?

The component labeled 'CT' in the diagram is most likely a:

What is the primary function of the switching sequence described in the diagram?

What is the name of the type of transformer used in the diagram?

The switching sequence described in the diagram is for moving from tap position 'n' to 'n+1.' What does 'n+1' likely represent?

What does the cam position indicate when the UVT-LTX is in Neutral?

In the switching sequence of the Reactor Type OLTC VACUTAP® RMV, which is the initial tap position when moving from tap position n to n+1?

What time duration is approximately indicated for each step in the switching sequence?

In the context of the switching sequence, what does 'Non-Bridging Position' refer to?

What is the sequence identifier for the RMV Switching Sequence mentioned in the content?

Which term is used to describe the time elapsed during the transition between tap positions in the sequence?

What component is specifically excluded from the switching sequence diagram provided?

What is the key function of the Reactor Type OLTC VACUTAP® RMV in this context?

What is the approximate time duration for the switching sequence from tap position n+1 to n in the reactor type OLTC VACUTAP® RMV?

What does the "AIW" label represent in the diagram illustrating the switching sequence?

Which of the following components is NOT directly involved in the switching sequence from tap position n+1 to n?

What is the likely function of the "P" components labelled in the diagram?

Based on the diagram, what is the likely function of the "Ic" component?

During the switching sequence, what is the most likely reason for the involvement of "IL" (Inductive Load)?

What is the likely purpose of the "Bridging Position" in the switching sequence?

What is the key difference between the two diagrams provided, representing the switching sequence?

Study Notes

Replacement Procedures for VACUTAP® RMV-II On-load Tap-changers

Inspection and Replacement of Bolts

Switching Sequence for VACUTAP® RMV

Maintenance Recommendations

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Description

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