Questions and Answers
What is the primary risk associated with the switching oil in on-load tap-changers?
What precaution must be taken before removing the on-load tap-changer cover?
Which is a mandatory action when emptying the diverter switch oil compartment?
What should be done with the bleeder valve during maintenance work on the on-load tap-changer?
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Which of the following is strictly forbidden during maintenance on the on-load tap-changer?
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What must be ensured about the area around the on-load tap-changer during operation?
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Why is adequate ventilation important during maintenance of the on-load tap-changer?
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What is a key characteristic of the oil contained in on-load tap-changers?
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What is the maximum weight of the tap changer parts as specified?
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Which component must be constructed according to the sealing surface of the tap changer head?
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What is recommended for positioning the studs for mounting the tap changer head?
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What is the approximate weight of the motor drive MA 9?
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What should be done with the tap changer parts until assembly?
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What is the weight of the protective relay RS 2001?
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Which part is specifically noted to be packed with the tap changer?
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How are the tap changer parts recommended to be handled until just before installation?
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What is essential to ensure when installing the tap changer into the supporting structure?
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Which section outlines the instructions for connecting the tap winding and the tap changer take-off terminal?
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What must be avoided when lifting the tap changer into its mounting position?
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What is the final installation requirement for the tap changer after mounting the bell-type tank?
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Which mounting component is recommended for use with a bell-type cover?
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What is emphasized regarding the tap changer's position during installation?
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What is a crucial consideration when mounting the tap changer into the tank?
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In which section of the installation guide is the procedure for mounting the tap changer found?
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What is the voltage rating for the tap changer head type H lil?
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What is the primary function of the bleeding facility mentioned in the content?
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Which connection is designed only for the oil filter according to the information?
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What is the maximum rotational orientation for the suction pipe connection?
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What is indicated by the designation 'E2' in the context of the tap changer?
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Which type of tap changer is specifically referenced in the document?
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How thick is the connecting flange as mentioned in the content?
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What does the letter 'Zs' likely represent in the context of the diagram?
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What feature does the tap changer head provide under the designation 'Eq'?
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For what purpose is the 'Connection for protective relay' used?
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What action should be avoided while the tap changer is uncoupled?
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What needs to be done with the protective relay in relation to the circuit breakers?
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When should one proceed to energize the transformer?
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What is indicated by the term 'by-pass tube' in relation to the transformer?
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What should NOT be done after the protective relay has responded?
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What signifies a proper function of the motor drive housing?
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What must be verified regarding the circuit breakers during testing?
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What should be ensured about the condition of the control devices in the motor drive unit?
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The tap changer should always be lowered into the mounting flange without any support.
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An oil-resistant gasket is used on the mounting flange to prevent leaks.
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Spacer blocks can be temporarily left in place while setting up the bell-type cover.
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The screening ring of the tap changer must be protected during installation process.
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After mounting the bell-type cover, the tap changer head should be measured for lead connections.
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The tap changer head must be bolted to the transformer after the tap changer is installed.
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The tap changer needs to be raised by a lifting device in its final positioned state after the bell-type cover setup.
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It is suggested to clean the sealing surfaces before attaching the tap changer head.
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The tap changer must be installed in an exact horizontal position to ensure proper functioning.
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It is necessary to ensure ample clearance for the tap changer to rise to its final installation position after mounting.
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The mounting flange should only be used with a cover type that is not bell-shaped.
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Connected leads must exert some force on the tap changer for it to function correctly.
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Installing the tap changer incorrectly can lead to significant operational risks.
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Instructions for connecting the tap winding and the tap changer take-off terminal are located in section 5.
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The tap changer is designed to be lifted directly without consideration of its position in the supporting structure.
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The installation procedure for the tap changer does not require any specific sections to be followed.
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The model type referenced for the on-load tap changer is H II 400 D.
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The guidance pin is labeled as Z in the documentation.
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The maximum voltage rating for the on-load tap changer mentioned is 145 kV.
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It is permissible to install the tap changer into any type of tank.
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The document lists the on-load tap changer as having tie-in resistors.
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The attachment for the motor drive unit is indicated as MA 9.
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The drawing shows a changeover selector turned to sectional plane 8750.
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The document emphasizes the importance of the bleeder valve during maintenance on the tap changer.
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The tap changer components are recommended to be handled gently until just before installation.
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The label 'Eq' refers to a specific feature of the tap changer head providing a mechanism for electrical connections.
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The maximum weight specified for the tap changer parts is 1000 kilograms.
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Reinhausen Maschinenfabrik is located in Regensburg, Germany.
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The fax number for Reinhausen Maschinenfabrik is (+49) 9 4 1 / 4 0 90-111.
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The year mentioned in the printed document is 2023.
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The telex number provided is 65881.
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The postal code for Reinhausen Maschinenfabrik is D-93025.
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The tap changer cover remains open during the entire drying process.
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A temperature of 90 °C is maintained for about 3 to 4 hours during the drying process.
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The tap changer should always be overrun for proper alignment during adjustment.
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To facilitate sufficient drying, the temperature can be increased by about 10°C per hour.
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The duration of the drying procedure is typically shorter than that of the transformer.
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A nominal width of 25 mm is recommended for the connecting pipe used in the drying process.
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The tap changer adjustment position should be checked using the inspection window.
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The tap changer cover must be opened periodically to ensure it remains vacuum-proof.
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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.
