On-Load Tap Changer Operating Instructions
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Questions and Answers

What is the primary risk associated with the switching oil in on-load tap-changers?

  • It is prone to freezing at low temperatures.
  • It may release explosive switching gases. (correct)
  • It can lead to electrical short circuits.
  • It can cause corrosion of metal surfaces.

    • What precaution must be taken before removing the on-load tap-changer cover?

  • Ensure the area is well-lit.
  • Check oil levels in the conservator.
  • Wear protective eyewear.
  • Deactivate all auxiliary circuits. (correct)

    • Which is a mandatory action when emptying the diverter switch oil compartment?

  • Use manual pumping methods exclusively.
  • Use hoses specifically designed for use with water.
  • Avoid opening any valves during the process.
  • Use only conductive and grounded hoses. (correct)

    • What should be done with the bleeder valve during maintenance work on the on-load tap-changer?

    <p>It must be opened after deactivating circuits.</p> Signup and view all the answers

    Which of the following is strictly forbidden during maintenance on the on-load tap-changer?

    <p>Operating electrical equipment and power tools.</p> Signup and view all the answers

    What must be ensured about the area around the on-load tap-changer during operation?

    <p>There must be no open fire or hot surfaces.</p> Signup and view all the answers

    Why is adequate ventilation important during maintenance of the on-load tap-changer?

    <p>To aid the removal of accumulated switching gas.</p> Signup and view all the answers

    What is a key characteristic of the oil contained in on-load tap-changers?

    <p>It must be treated as a flammable liquid.</p> Signup and view all the answers

    What is the maximum weight of the tap changer parts as specified?

    <p>265 kg</p> Signup and view all the answers

    Which component must be constructed according to the sealing surface of the tap changer head?

    <p>Mounting flange</p> Signup and view all the answers

    What is recommended for positioning the studs for mounting the tap changer head?

    <p>A drilling template</p> Signup and view all the answers

    What is the approximate weight of the motor drive MA 9?

    <p>60 kg</p> Signup and view all the answers

    What should be done with the tap changer parts until assembly?

    <p>They must be stored in a dry place.</p> Signup and view all the answers

    What is the weight of the protective relay RS 2001?

    <p>3.5 kg</p> Signup and view all the answers

    Which part is specifically noted to be packed with the tap changer?

    <p>Drive shaft parts</p> Signup and view all the answers

    How are the tap changer parts recommended to be handled until just before installation?

    <p>Wrapped in airtight protective cover</p> Signup and view all the answers

    What is essential to ensure when installing the tap changer into the supporting structure?

    <p>The tap changer must not exert any force on the mounting.</p> Signup and view all the answers

    Which section outlines the instructions for connecting the tap winding and the tap changer take-off terminal?

    <p>Section 5</p> Signup and view all the answers

    What must be avoided when lifting the tap changer into its mounting position?

    <p>Applying unnecessary force on the tap changer.</p> Signup and view all the answers

    What is the final installation requirement for the tap changer after mounting the bell-type tank?

    <p>It needs to be raised to an exact vertical position.</p> Signup and view all the answers

    Which mounting component is recommended for use with a bell-type cover?

    <p>A mounting flange</p> Signup and view all the answers

    What is emphasized regarding the tap changer's position during installation?

    <p>It must be installed safely with sufficient clearance.</p> Signup and view all the answers

    What is a crucial consideration when mounting the tap changer into the tank?

    <p>It should ensure a free movement for future operations.</p> Signup and view all the answers

    In which section of the installation guide is the procedure for mounting the tap changer found?

    <p>Sections 4.3 to 4.7</p> Signup and view all the answers

    What is the voltage rating for the tap changer head type H lil?

    <p>76 kV</p> Signup and view all the answers

    What is the primary function of the bleeding facility mentioned in the content?

    <p>To remove trapped air from the system</p> Signup and view all the answers

    Which connection is designed only for the oil filter according to the information?

    <p>Connection for oil return pipe</p> Signup and view all the answers

    What is the maximum rotational orientation for the suction pipe connection?

    <p>350°</p> Signup and view all the answers

    What is indicated by the designation 'E2' in the context of the tap changer?

    <p>Bleeding facility for space under the head outside the oil compartment</p> Signup and view all the answers

    Which type of tap changer is specifically referenced in the document?

    <p>On-load tap changer type H</p> Signup and view all the answers

    How thick is the connecting flange as mentioned in the content?

    <p>16 mm</p> Signup and view all the answers

    What does the letter 'Zs' likely represent in the context of the diagram?

    <p>Short circuit impedance</p> Signup and view all the answers

    What feature does the tap changer head provide under the designation 'Eq'?

    <p>Bleeding facility for tap changer head</p> Signup and view all the answers

    For what purpose is the 'Connection for protective relay' used?

    <p>Detecting current overloads</p> Signup and view all the answers

    What action should be avoided while the tap changer is uncoupled?

    <p>Operating the motor drive</p> Signup and view all the answers

    What needs to be done with the protective relay in relation to the circuit breakers?

    <p>Insert it into the tripping circuit</p> Signup and view all the answers

    When should one proceed to energize the transformer?

    <p>After pressing the test button 'IN SERVICE'</p> Signup and view all the answers

    What is indicated by the term 'by-pass tube' in relation to the transformer?

    <p>A temporary connection during maintenance</p> Signup and view all the answers

    What should NOT be done after the protective relay has responded?

    <p>Reset the relay immediately</p> Signup and view all the answers

    What signifies a proper function of the motor drive housing?

    <p>Maintaining the electrical heater condition</p> Signup and view all the answers

    What must be verified regarding the circuit breakers during testing?

    <p>That they switch off during a test</p> Signup and view all the answers

    What should be ensured about the condition of the control devices in the motor drive unit?

    <p>That they operate flawlessly</p> Signup and view all the answers

    The tap changer should always be lowered into the mounting flange without any support.

    <p>False</p> Signup and view all the answers

    An oil-resistant gasket is used on the mounting flange to prevent leaks.

    <p>True</p> Signup and view all the answers

    Spacer blocks can be temporarily left in place while setting up the bell-type cover.

    <p>False</p> Signup and view all the answers

    The screening ring of the tap changer must be protected during installation process.

    <p>True</p> Signup and view all the answers

    After mounting the bell-type cover, the tap changer head should be measured for lead connections.

    <p>True</p> Signup and view all the answers

    The tap changer head must be bolted to the transformer after the tap changer is installed.

    <p>False</p> Signup and view all the answers

    The tap changer needs to be raised by a lifting device in its final positioned state after the bell-type cover setup.

    <p>False</p> Signup and view all the answers

    It is suggested to clean the sealing surfaces before attaching the tap changer head.

    <p>True</p> Signup and view all the answers

    The tap changer must be installed in an exact horizontal position to ensure proper functioning.

    <p>False</p> Signup and view all the answers

    It is necessary to ensure ample clearance for the tap changer to rise to its final installation position after mounting.

    <p>True</p> Signup and view all the answers

    The mounting flange should only be used with a cover type that is not bell-shaped.

    <p>False</p> Signup and view all the answers

    Connected leads must exert some force on the tap changer for it to function correctly.

    <p>False</p> Signup and view all the answers

    Installing the tap changer incorrectly can lead to significant operational risks.

    <p>True</p> Signup and view all the answers

    Instructions for connecting the tap winding and the tap changer take-off terminal are located in section 5.

    <p>True</p> Signup and view all the answers

    The tap changer is designed to be lifted directly without consideration of its position in the supporting structure.

    <p>False</p> Signup and view all the answers

    The installation procedure for the tap changer does not require any specific sections to be followed.

    <p>False</p> Signup and view all the answers

    The model type referenced for the on-load tap changer is H II 400 D.

    <p>False</p> Signup and view all the answers

    The guidance pin is labeled as Z in the documentation.

    <p>True</p> Signup and view all the answers

    The maximum voltage rating for the on-load tap changer mentioned is 145 kV.

    <p>True</p> Signup and view all the answers

    It is permissible to install the tap changer into any type of tank.

    <p>False</p> Signup and view all the answers

    The document lists the on-load tap changer as having tie-in resistors.

    <p>True</p> Signup and view all the answers

    The attachment for the motor drive unit is indicated as MA 9.

    <p>False</p> Signup and view all the answers

    The drawing shows a changeover selector turned to sectional plane 8750.

    <p>False</p> Signup and view all the answers

    The document emphasizes the importance of the bleeder valve during maintenance on the tap changer.

    <p>False</p> Signup and view all the answers

    The tap changer components are recommended to be handled gently until just before installation.

    <p>True</p> Signup and view all the answers

    The label 'Eq' refers to a specific feature of the tap changer head providing a mechanism for electrical connections.

    <p>False</p> Signup and view all the answers

    The maximum weight specified for the tap changer parts is 1000 kilograms.

    <p>False</p> Signup and view all the answers

    Reinhausen Maschinenfabrik is located in Regensburg, Germany.

    <p>True</p> Signup and view all the answers

    The fax number for Reinhausen Maschinenfabrik is (+49) 9 4 1 / 4 0 90-111.

    <p>True</p> Signup and view all the answers

    The year mentioned in the printed document is 2023.

    <p>False</p> Signup and view all the answers

    The telex number provided is 65881.

    <p>True</p> Signup and view all the answers

    The postal code for Reinhausen Maschinenfabrik is D-93025.

    <p>True</p> Signup and view all the answers

    The tap changer cover remains open during the entire drying process.

    <p>False</p> Signup and view all the answers

    A temperature of 90 °C is maintained for about 3 to 4 hours during the drying process.

    <p>True</p> Signup and view all the answers

    The tap changer should always be overrun for proper alignment during adjustment.

    <p>False</p> Signup and view all the answers

    To facilitate sufficient drying, the temperature can be increased by about 10°C per hour.

    <p>True</p> Signup and view all the answers

    The duration of the drying procedure is typically shorter than that of the transformer.

    <p>False</p> Signup and view all the answers

    A nominal width of 25 mm is recommended for the connecting pipe used in the drying process.

    <p>True</p> Signup and view all the answers

    The tap changer adjustment position should be checked using the inspection window.

    <p>True</p> Signup and view all the answers

    The tap changer cover must be opened periodically to ensure it remains vacuum-proof.

    <p>False</p> Signup and view all the answers

    Study Notes

    Safety Precautions

    • On-load tap-changer oil is flammable; handle with care to avoid fire hazards.
    • Explosive switching gases may be present in various areas of the tap-changer; ensure no open flames or sparks nearby.
    • Use only conductive and grounded hoses and equipment when handling flammable liquids.
    • Deactivate auxiliary circuits before working on the tap-changer cover and avoid using electrical tools that could create sparks.

    Maintenance and Operation

    • Open the bleeder valve while the stop valve between the oil conservator and diverter switch is open, allowing gas to escape safely.
    • Adequate ventilation is essential while working on the tap-changer to disperse switching gases.
    • Once bleeding is complete and oil flows, close the bleeder valve first, then the stop valve.

    Specifications

    • Approximate weight of the tap-changer type H is 240 kg; the variant H 111 400 D-145 weighs around 265 kg.
    • Different motor drives (MA 7: ~90 kg, MA 9: ~60 kg) and protective relays (RS 2001: 3.5 kg) accompany the tap-changer.

    Installation Instructions

    • Store tap-changer parts in a dry location until ready for assembly; keep them sealed in their protective covering until installation.
    • A mounting flange is necessary for securing the tap-changer head to the transformer cover.
    • Position studs accurately with the aid of a drilling template to ensure correct installation.

    Installation Procedure

    • Lift the tap-changer into the supporting structure with care to avoid any forces on the tap-changer.
    • Ensure proper clearance is available for the tap-changer to rise to its final installation position.
    • Protective relays must be integrated into the circuit to immediately disconnect the transformer upon activation.

    Final Precautions

    • Ensure that the motor drive is not operated while the tap-changer is un-coupled.
    • Cover all electrical equipment functions and control devices for safety before energizing the transformer after maintenance.
    • Reset the protective relay only after ensuring the tap-changer has been addressed following activation.

    Tap Changer Attachment Process

    • The tap changer is mounted onto the transformer cover via a mounting flange.
    • Clean the sealing surfaces before placing an oil-resistant gasket on the mounting flange.
    • Temporarily use spacer blocks to ensure proper installation height prior to attaching the bell-type cover.
    • Ensure avoidance of damage to screening rings and tap changer terminals during installation.

    Installation Steps

    • The tap changer must be lifted and positioned accurately into the supporting structure.
    • It should be securely fastened in the correct mounting position and maintained in a vertical orientation.
    • Connected leads must not apply any force on the tap changer after installation.
    • Adequate clearance is necessary for the tap changer to be raised to its final position post bell-type tank installation.

    Temperature Controls

    • Maintain a constant temperature of approximately 90 °C during the drying process.
    • Increase the kerosene vapor temperature by 10°C per hour, up to a maximum of 125°C for effective drying.
    • Drying duration should align with the transformer drying procedure, typically around 3 to 4 hours.

    Post-Installation Procedures

    • After the transformer ratio test, the tap changer must be adjusted back to the designated position as noted in the equipment connection diagram.
    • Ensure through an inspection window that the tap changer has not surpassed the end positions indicated by the connection diagram.

    Important Notes

    • The tap changer cover is vacuum-proof, necessitating careful handling during the connection of the by-pass tube to facilitate drying.
    • Use a connecting pipe to connect the transformer tank to the tap changer head for drying purposes.
    • Maintain vigilant observation of temperature and installation protocols for ensuring optimal performance and safety.

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    Description

    This quiz covers the operating instructions for Type H On-Load Tap Changers, emphasizing the importance of safety precautions when handling flammable switching oil and explosive switching gases. Understanding these instructions is crucial for safe and effective operation.

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