Questions and Answers
What is the function of the bleeder screw for the suction pipe?
Which component is responsible for indicating the position of the tap changer?
What does the inspection window allow users to do?
In which configuration is the upper gear unit arranged in the tap changer?
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Which of the following parts is used for the protective relay connection?
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What is the role of the suspension bar in the tap changer?
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What aspect of the tap changer should be regularly tested by the user?
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Which component is part of the oil filtration system in the tap changer?
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What factors vary among different models of on-load tap changers?
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What is the primary function of a diverter switch in the context of the tap changer?
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Which component in the motor drive unit is responsible for selecting taps?
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In an operational sequence of a tap-changer, which measurement is directly related to timing?
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What does the 'maximum rated through-current' indicate in a tap changer model?
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Which of the following components is NOT mentioned as part of the tap changer's operational design?
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Which model designation represents a specific on-load tap changer configuration?
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What aspect of the tap changer is critical for ensuring its operational safety and performance?
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What is the first step to remove the sectorial contact shells?
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What must be evaluated before removing the sectorial contact shells?
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Which of the following describes the correct position of the diverter switch during removal?
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What is indicated by reaching a balanced intermediate position during the removal process?
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What should be done once the limit values from section 5.3 are reached?
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What markings indicate the sectorial contact shells during evaluation?
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Where are the corresponding marks for original placement located?
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What should be used to turn the drive shaft during the removal process?
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What must be verified to ensure the proper functioning of the tap changer and motor drive?
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What should be checked if the tap changer is controlled by a voltage regulator?
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What action should be taken when the protective relay RS 2001 is energized?
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Which document provides the operating instructions for the motor drive MA7?
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What is a primary concern when checking the voltage regulator settings?
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Where can the operational details for checking contact wear be found?
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Which component's settings must be correct to ensure proper tap changer operation?
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What should be done regarding position limitation of the motor drive?
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What is the primary benefit of filtering switching oil in T model systems?
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Which of the following T model configurations allows for the longest inspection intervals?
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What specific condition must be met when replacing single contact tips in a diverter switch?
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What role does continuous filtering play in the system's operation?
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What is the maximum operating current for the T 1111000 model according to the specifications?
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How should values be determined for maintenance in diverter switch sectors?
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What should be done first when setting the diverter switch to a different position?
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Which model configuration has the lowest mechanical life expectation with an oil filter?
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The maximum rated through-current for the tap changer type T is 600A.
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The tap selector size for the discussed on-load tap changer is C.
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A mid-position is included among the operational positions of the tap changer type T.
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The insulation level to ground for the tap changer type T is 110Kv.
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The contact circle pitch for the tap changer is indicated as 19.
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The series voltage of the specified tap changer is essential for determining its model designation.
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The diverter switch helps in the transfer of current from one tap to another during a load change.
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Ohmic resistors are used to facilitate a break in current during the tap change operation.
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A voltage regulator is responsible for initiating a tap change operation by selecting the desired tap.
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The functional test of the tap changer includes evaluating the protective relay RS 2001.
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The operational principle of an on-load tap changer involves preselecting a tap based on the operation of the motor drive.
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Inspection tools mentioned in the appendix are unrelated to the maintenance of the tap changer.
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The protective relay must be in the 'Transformer off' position to allow closing of the circuit breakers.
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The horizontal and vertical drive shafts should not be checked during the tap changer functional test.
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The maximum torque for locking the hood of the test push-buttons is 10 Nm.
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A special design of the tap changer may feature ball joints requiring grease evaluation.
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Replenishing grease in the bevel gear is not necessary during the tap changer's maintenance check.
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The lag of the motor drive does not need to be equalized in both directions.
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To conduct a functional test, the tap changer must be run through its entire operating range.
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O-rings do not require any specific maintenance during the tap changer functional test.
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The main function of the tap selector gear is to lift the diverter switch unit.
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Inspection windows are designed to provide visibility for regular inspections of the tap changer.
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The position indicator is found within the oil compartment of the diverter switch.
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Cover bolts are critical for maintaining the integrity of the tap changer head and preventing oil leaks.
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The bleeder screw for the suction pipe is primarily used for oil filtration maintenance.
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A greater number of grading rings in a diverter switch oil compartment indicates improved operational efficiency.
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Pipe connection R is used for the return pipe in tap changers equipped with oil filter units.
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The fine tap selector allows for precise adjustments in tap changes within the tap changer.
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The diverter switch must be set to the intermediate position to remove the sectorial contact shells.
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During the removal process, the sectorial contact shells are evaluated based on the markings L1, L2, and L4.
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To operate the drive shaft, the operating key must be actuated while releasing the spring energy accumulator.
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The limit values specified in section 5.3 must not be reached before replacing contacts.
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Values for maintenance in diverter switch sectors should be determined before entering them into table l l l.
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The drive shaft should not be turned until after the sectorial contact shells have been evaluated.
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When reinstalling the sectorial contact shells, it is essential to ensure they are mounted randomly.
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The value X refers to the position of the diverter switch during the evaluation of measured values.
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Study Notes
Motor Drive Unit and Tap Changers
- A motor drive unit operates tap selectors and diverter switches, crucial in changing circuit configurations.
- Time parameters for operation include 13, 10, 08, and 53 seconds, indicating intervals relevant to switching actions.
On-Load Tap Changer Models
- On-load tap changers come in various models based on poles, maximum rated through-current, insulation levels, and tap selector sizes.
- Models include specific type codes like T I 601 —10/ B — 1019 1W denoting configurations and electrical connections.
Principal Parts of Tap Changer
- Key components include:
- Gasket for tap changer head
- Position indicator for operational status
- Inspection window for monitoring
- Diverter switch oil compartment for switching mechanisms
- Tap selector gear components for accurate tapping
- Diverter switches influence metal wear and lifespan; filtration systems extend oil change intervals.
Inspection Guidelines
- Regular inspections ensure operational integrity, especially for versions with and without oil filters.
- Measured values during inspections are vital for determining wear and maintenance needs.
Replacement and Maintenance
- Replacement of contact tips is allowed, necessitating matching thickness layers to specified criteria.
- Position indicators must align across tap changers and motor drives to ensure synchronized operation.
- Electrical and mechanical limitations must be routinely checked, particularly for motor drive systems controlled by voltage regulators.
Operational Safety
- Protect circuits with a relay mechanism; immediate action is required to shut off operations if the relay energizes unexpectedly.
- Functional tests verify relay performance to prevent unnecessary tap changes, ensuring transformer security.
Appendix References
- Guidance includes detailed evaluation techniques for measuring contact wear.
- Definitions for correct configuration and contact positions for diverter switches are referenced to ensure proper maintenance.
Tap Changer Operations
- Tap change operation is initiated by the tap selector preselecting the desired transformer winding.
- The diverter switch transfers current from the active tap to the preselected tap using ohmic resistors for no-break transfer.
- Key components include the tap selector size, poles, maximum rated current in amperes, and insulation level to ground.
Components of On-Load Tap Changer
- Inspection points highlighted in colored diagrams include the tap changer head, position indicator, and upper gear unit.
- Main parts: gasket, cover bolts, driving shafts, and diverter switch oil compartment.
- Diverter switch oil compartment contains grading rings, suction pipe, and terminal connections for the oil system.
Functional Tests
- Regular checks on the contact shells, sectorial contacts, and overall function of the tap changer are essential for safety.
- The functional test ensures symmetrical coupling and proper motor drive lag, which must be equal in both directions.
Inspection Procedures
- Contact wear evaluation and replacement are necessary upon reaching specified limit values.
- Use a spring energy accumulator to facilitate the removal of sectorial contact shells for inspection.
- Adjustments to coupling, grease, and axial clearance are critical for the operational integrity of drive shafts.
Maintenance Guidelines
- Maintain clear and precise documentation of all values and setups during inspections.
- Ensure proper grounding of transformer terminals and verify operational safety mechanisms, including fire-extinguishing equipment.
- Test push-button operations without energizing the system to ensure reliable functioning of circuit breakers.
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Description
Explore the workings of motor drive units and on-load tap changers through this quiz. Understand key components, operation times, and inspection guidelines essential for these electrical devices. Test your knowledge on configurations, models, and principal parts involved in tap changing mechanisms.
