OILTAP® V Motor-Drive Unit Overview
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Questions and Answers

What is the primary function of the motor-drive unit in the on-load tap-changer system?

  • To physically change the oil in the transformer
  • To adjust the transmission ratio based on operating requirements (correct)
  • To receive control impulses from various transformers
  • To initiate a voltage regulation process

    • Which component directly supports the on-load tap-changer on the transformer?

  • Cylindrical pressure-proof oil compartment
  • On-load tap-changer head (correct)
  • Vertical drive shaft
  • RS protective relay

    • In the context of the described system, what is the role of the insulating fluid?

  • To enhance the efficiency of the motor-drive unit
  • To prevent electrical surges during operation
  • To lubricate the bevel gear system
  • To separate the transformer oil from the tap-changer (correct)

    • What mechanism is utilized by the on-load tap-changer to change the transmission ratio?

    <p>A mechanical diverter switch</p> Signup and view all the answers

    Which part is responsible for transmitting control impulses to the motor-drive unit?

    <p>Voltage regulator</p> Signup and view all the answers

    What is the primary function of the DW 2000 pressure monitoring device?

    <p>To protect the on-load tap-changer from excessive pressure</p> Signup and view all the answers

    What combination does the on-load tap-changer uniquely provide?

    <p>Diverter switch and tap selector</p> Signup and view all the answers

    How does the pressure monitoring device detect a pressure increase?

    <p>Using a corrugated tube linked with a spring mechanism</p> Signup and view all the answers

    What occurs when the pressure monitoring device is tripped?

    <p>The circuit breaker is triggered and the transformer is de-energized</p> Signup and view all the answers

    How is the on-load tap-changer and motor-drive unit shipped?

    <p>In the adjustment position</p> Signup and view all the answers

    What does the cylindrical pressure-proof oil compartment do in the system?

    <p>Separates insulating fluid from transformer oil</p> Signup and view all the answers

    How is the tripping pressure of the pressure monitoring device established?

    <p>It is preset at the factory and cannot be changed</p> Signup and view all the answers

    What is needed to reset the pressure monitoring device after it has tripped?

    <p>Manual intervention to return the switch to initial position</p> Signup and view all the answers

    In what way does the pressure monitoring device respond to pressure changes compared to the protective relay?

    <p>It responds faster to large pressure increases</p> Signup and view all the answers

    What kind of pressures does the DW 2000 monitor?

    <p>Both static and dynamic pressures</p> Signup and view all the answers

    Where is the pressure monitoring device installed in relation to the on-load tap-changer?

    <p>On the outside of the on-load tap-changer</p> Signup and view all the answers

    What is the maximum temperature allowed during the vacuum-drying process of the on-load tap-changer?

    <p>125 °C</p> Signup and view all the answers

    What is the required duration for pre-drying the on-load tap-changer in circulating air?

    <p>20 hours</p> Signup and view all the answers

    What should be the residual pressure of the on-load tap-changer after the drying process?

    <p>10-3 bar</p> Signup and view all the answers

    Which step must be performed to avoid damage when securing the on-load tap-changer head cover?

    <p>Cleaning sealing surfaces</p> Signup and view all the answers

    What temperature increase rate is recommended when heating up the on-load tap-changer?

    <p>10 °C/h</p> Signup and view all the answers

    What must be ensured regarding the o-ring during the mounting of the head cover?

    <p>It must remain undamaged</p> Signup and view all the answers

    How should the on-load tap-changer head cover be aligned before securing it?

    <p>With red triangular markings aligned</p> Signup and view all the answers

    What is the implication of having a missing or damaged o-ring?

    <p>It leads to insulating fluid escaping</p> Signup and view all the answers

    What is the primary function of the rupture disk mentioned in the content?

    <p>To relieve pressure in the oil compartment</p> Signup and view all the answers

    Which standard does the rupture disk comply with?

    <p>IEC 60214-1</p> Signup and view all the answers

    What is the response mechanism of the MPreC® pressure relief device?

    <p>It responds to a defined overpressure</p> Signup and view all the answers

    What does the temperature monitoring system track?

    <p>Temperature of the insulating fluid in the oil compartment</p> Signup and view all the answers

    In what locations are the pressure relief devices located?

    <p>In the on-load tap-changer head cover</p> Signup and view all the answers

    How does the MPreC® pressure relief device differ from the rupture disk?

    <p>It is supplied only upon request</p> Signup and view all the answers

    Which component does NOT provide a signaling function?

    <p>Rupture disk</p> Signup and view all the answers

    Which component is responsible for monitoring the pressure in the system?

    <p>MPreC® pressure relief device</p> Signup and view all the answers

    What is the maximum allowable speed for drilling when working with the on-load tap-changer?

    <p>250 rpm</p> Signup and view all the answers

    What action should be taken if an incomplete tap-change operation occurs?

    <p>Continue cranking to complete the tap-change operation</p> Signup and view all the answers

    In a multiple-column application, what is required for connecting on-load tap-changer heads?

    <p>A shared drive using horizontal drive shaft parts</p> Signup and view all the answers

    How many revolutions should be cranked after operating the diverter switch to complete the tap-change operation?

    <p>2.5 revolutions</p> Signup and view all the answers

    What should be done after completing the transformer ratio test?

    <p>Switch the on-load tap-changer to adjustment position</p> Signup and view all the answers

    What tool can be used for actuating the change-over selector if higher torque is required?

    <p>A hand wheel or crank</p> Signup and view all the answers

    What should not be exceeded when reaching the end positions while operating the on-load tap-changer?

    <p>The limit indicated in the connection diagram</p> Signup and view all the answers

    What is the purpose of opening the kerosene drain plug in the oil compartment?

    <p>To dry the on-load tap-changer with kerosene</p> Signup and view all the answers

    The on-load tap-changer head features 6 pipe connections.

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

    Pipe connection Q is intended for connecting the oil filter unit.

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

    The functions of the R and Q pipe connections can be interchanged.

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

    All pipe bends can be swiveled without loosening the pressure ring.

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

    A rupture disk is located outside of the oil compartment.

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

    The OILTAP® V on-load tap-changer is designed for a limited number of maximum operating positions.

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

    Pipe connection Q has an open connection for the oil filter unit.

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

    The upper gear unit is a part of the on-load tap-changer assembly.

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

    The on-load tap-changer can switch 3 times the rated through-current $I_r$ at its rated step voltage $U_{ir}$.

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

    Only qualified personnel should perform necessary work on the product.

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

    The product is designed to operate under direct current conditions with a frequency of 50/60 Hz.

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

    The serial numbers of on-load tap-changer accessories must match if supplied as a set in one order.

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

    Operating the product contrary to the provided technical file is permissible if conditions allow.

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

    The nameplate of the product includes the standard valid for the product and the year of issue.

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

    Special tools not included in the scope of delivery may be used for the intended purpose of the equipment.

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

    An on-load tap-changer must be operated in accordance with the specified delivery conditions and technical data.

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

    The DW 2000 pressure monitoring device operates without any mechanical components.

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

    The pressure monitoring device is designed to trip under conditions of low-energy interference.

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

    After triggering, the sensor on the snap-action switch must be reset manually to its initial position.

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

    The tripping pressure of the pressure monitoring device can be adjusted after installation.

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

    The pressure monitoring device is installed inside the oil compartment of the on-load tap-changer.

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

    The pressure monitoring device reacts more slowly to pressure increases than the protective relay.

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

    A corrugated tube in the pressure monitoring device functions similarly to a barometer.

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

    Once tripped, the transformer is immediately re-energized without any manual intervention.

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

    The maximum permissible axial offset for the drive shaft is 4°.

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

    An intermediate bearing is required when the maximum value of 2472 mm is exceeded.

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

    The standard version of the drive shaft includes a cardan joint and an insulator.

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

    The middle of the hand crank and the middle of the bevel gear measures 536 mm.

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

    The protective cover is a critical component of the drive shaft assembly.

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

    A hose clip is used to secure the coupling bracket in the drive shaft system.

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

    Crates should be stacked above a height of 1.5 m to ensure stability during transport.

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

    The outer marking on the packaging indicates if the on-load tap-changer has been packed upright.

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

    Desiccant is added after the plastic foil is bonded around the packaged goods.

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

    Sealed packaging surrounds the packaged goods with plastic foil on all sides to enhance protection.

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

    It is permissible to stack up to three equally sized crates on top of each other.

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

    Adherence to packaging markings is optional for the shipment of non-hazardous goods.

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

    The packaging is designed to prevent the parts from touching the loading surface during transportation.

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

    Incorrectly stacked crates can lead to damage to the packaged goods during transportation.

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

    What is the first step in checking the protective relay before commissioning the transformer?

    <p>Ensure that the flap valve is in the OPERATION position</p> Signup and view all the answers

    During the testing of the pressure monitoring device, why is it important to ground the transformer on both the high-voltage and low-voltage sides?

    <p>To ensure the safety of personnel during testing</p> Signup and view all the answers

    Which condition must be satisfied during the pressure monitoring device test to ensure safety?

    <p>The transformer needs to remain de-energized</p> Signup and view all the answers

    What action should be taken after activating the sensor on the snap-action switch during the passive protection test?

    <p>Leave the transformer's danger zone</p> Signup and view all the answers

    What is the primary purpose of pressing the OFF test button during the protective relay check?

    <p>To confirm the protective relay is functioning</p> Signup and view all the answers

    Which operation must be performed to ensure the circuit breaker cannot be closed during the pressure monitoring device check?

    <p>Ground the transformer on both sides</p> Signup and view all the answers

    What indicates that the sensor on the snap-action switch is in the OFF position?

    <p>The sensor requires activation for testing</p> Signup and view all the answers

    When testing the transformer, how should the circuit breaker be handled after deactivating the fire extinguishing device?

    <p>It must remain open until all tests are complete</p> Signup and view all the answers

    What is the consequence of activating the tap-change supervisory device?

    <p>The motor-drive unit can no longer be electrically actuated.</p> Signup and view all the answers

    What should be checked if the fill level of the insulating fluid has fallen below the minimum?

    <p>For leaks in the pipe system and the condition of the insulating fluid.</p> Signup and view all the answers

    Which action should be taken after the tripping of the motor protective switch in the motor-drive unit?

    <p>Refer to the fault elimination chapter in the operating instructions.</p> Signup and view all the answers

    What is strictly prohibited when the transformer is switched on?

    <p>Manual operation of the motor-drive unit with the hand crank.</p> Signup and view all the answers

    Under what condition must the on-load tap-changer and transformer be checked?

    <p>After any tripping event to determine the cause.</p> Signup and view all the answers

    What could activation of a rupture disk in the on-load tap-changer head indicate?

    <p>Potential pressure malfunction requiring immediate attention.</p> Signup and view all the answers

    When addressing a signaling contact that indicates insufficient insulating fluid, what must be prioritized?

    <p>Verification of the tap-changer's oil conservator quality.</p> Signup and view all the answers

    What is the initial action to be taken when motor-drive unit tripping occurs?

    <p>Refer to specific manufacturer fault elimination instructions.</p> Signup and view all the answers

    What can result from improper use of insulating fluids in the on-load tap-changer?

    <p>Damage to the on-load tap-changer</p> Signup and view all the answers

    What is a crucial safety measure when operating the on-load tap-changer?

    <p>Ensuring the pressure relief device is fitted if applicable</p> Signup and view all the answers

    Which of the following actions is essential to avoid an explosion when using the on-load tap-changer?

    <p>Preventing operations outside of permitted conditions</p> Signup and view all the answers

    What should be checked before operating the on-load tap-changer?

    <p>Whether a pressure relief device is attached if required</p> Signup and view all the answers

    What is a significant risk when the on-load tap-changer is overloaded?

    <p>Potential for explosion and serious injuries</p> Signup and view all the answers

    Which measure can be taken to mitigate the risk of static charge during commissioning?

    <p>Using grounded hoses and approved equipment</p> Signup and view all the answers

    What must be ensured regarding the on-load tap-changer's operational conditions?

    <p>It should adhere to the manufacturer’s specified limits.</p> Signup and view all the answers

    What could potentially happen if the on-load tap-changer head cover lacks a pressure relief device?

    <p>Possible damage to the on-load tap-changer</p> Signup and view all the answers

    Which information is NOT required to be reported to Maschinenfabrik Reinhausen after a protective relay trip?

    <p>Temperature of the transformer at tripping</p> Signup and view all the answers

    What action should be taken if the pressure monitoring device has been tripped?

    <p>Contact Maschinenfabrik Reinhausen for inspection</p> Signup and view all the answers

    What should be verified before recommissioning a transformer after an incident?

    <p>Both the protective relay and transformer are tested</p> Signup and view all the answers

    Why is it important to ensure the on-load tap-changer and transformer are sufficiently tested?

    <p>To prevent equipment operation during a fault condition</p> Signup and view all the answers

    When referencing the tripping of protective relay, which of the following is NOT a question to ask?

    <p>Was the transformer inspected last year?</p> Signup and view all the answers

    What potential consequence is indicated for insufficient testing of on-load tap-changer and transformer?

    <p>Risk of death or severe injury</p> Signup and view all the answers

    After identifying and fixing the cause of a protective relay trip, what is the first step in re-commissioning the transformer?

    <p>Check the protective relay</p> Signup and view all the answers

    What factor should NOT be ignored when performing the steps after a pressure monitoring device trip?

    <p>Performing unnecessary repairs immediately</p> Signup and view all the answers

    What potential consequence can result from using spare parts that are not approved by Maschinenfabrik Reinhausen GmbH?

    <p>Physical injury and product malfunctions</p> Signup and view all the answers

    Which characteristic defines an electrically skilled person in relation to safety and operational standards?

    <p>Identifies and avoids potential dangers independently</p> Signup and view all the answers

    How should an electrically trained person approach their assigned tasks according to the qualifications expected?

    <p>They require initial and continuous instruction from an electrically skilled person</p> Signup and view all the answers

    What is an essential requirement for the personnel responsible for assembly, commissioning, and maintenance of the system?

    <p>Sufficient qualification and technical training</p> Signup and view all the answers

    What role does the electrically skilled person fulfill in terms of compliance with laws and regulations?

    <p>Must comply with necessary statutory regulations for accident prevention</p> Signup and view all the answers

    What must be confirmed about the electrically skilled person's qualifications when performing electrical work?

    <p>They possess knowledge of applicable standards and regulations</p> Signup and view all the answers

    Which scenario correctly depicts the guidelines for using spare parts as established by Maschinenfabrik Reinhausen GmbH?

    <p>Consulting with Maschinenfabrik Reinhausen GmbH before modifications</p> Signup and view all the answers

    What indicates an electrically skilled person's ability to perform tasks related to electrical systems?

    <p>Technical qualification and proficiency in identifying dangers</p> Signup and view all the answers

    Pictograms provide a warning of dangerous electrical voltage.

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

    Multi-step instructions consist of only a single process step.

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

    Important information is presented to complicate understanding of procedures.

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

    The aim of action is a common component in both single-step and multi-step instructions.

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

    A pictogram warning of a danger of crushing is unnecessary in safety instructions.

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

    Tables are used to organize information regarding pictograms and instructions.

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

    The result of action is only optional in multi-step instructions.

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

    Only single-step instructions can include requirements related to the task.

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

    The maximum axial offset permissible for the drive shaft without a cardan joint is 3°.

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

    An intermediate bearing is required when the length exceeds 2472 mm.

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

    The standard version of the drive shaft includes a cardan joint.

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

    The middle of the hand crank is located 536 mm from the middle of the bevel gear in the drive shaft configuration.

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

    The coupling bracket is one of the components of the drive shaft.

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

    The square tube is not a part of the drive shaft assembly.

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

    An incompletely bled suction pipe does not affect the insulation capability of the on-load tap changer to ground.

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

    The motor-drive unit can operate without the insulating fluid in the oil compartment.

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

    Only circuits not stated in the technical data for position transmitter equipment may be connected to the position transmitter module.

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

    The vent screw must be opened and closed without bleeding the suction pipe.

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

    The selector/de-energized tap changer can operate when it's only partially filled with insulating fluid.

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

    Damage can occur to the on-load tap-changer if incorrect circuits are used for the position transmitter.

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

    Sealing the vent screw with the screw cap is a final step after ensuring the suction pipe is bled.

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

    The on-load tap-changer is designed for infinite maximum operating positions.

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

    It is safe to re-commission the transformer without contacting Maschinenfabrik Reinhausen after a protective relay has tripped.

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

    The pressure monitoring device can be tripped without any risk of injury if proper testing is not conducted.

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

    The transformer can be put back into operation immediately if the reason for the protective relay tripping is unknown.

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

    Overvoltages may be registered at the instant of tripping the transformer.

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

    The load of the transformer does not need to be reported to Maschinenfabrik Reinhausen when tripping occurs.

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

    It is recommended to check the protective relay before commissioning the transformer post-trip.

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

    Switching operations in the network can affect the operation of the transformer and should be reported at the time of tripping.

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

    Only the protective relay is responsible for the trip condition; no other devices need to be checked.

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

    An OF 100 oil filter unit with paper filter insert is recommended for on-load tap-changers that operate less than 15,000 tap-change operations per year.

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

    In tropical climates, the OF 100 oil filter unit must be used with a combined filter insert if the highest operating voltage is above 55 kV.

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

    The oil compartment of the on-load tap-changer poses no risk of explosion if handled correctly.

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

    When designing on-load tap-changers, ensuring the inclusion of an OF 100 oil filter unit is optional regardless of the climate conditions.

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

    The recommendation for an OF 100 oil filter unit extends the maintenance intervals for on-load tap-changers.

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

    Explosive gases in oil conservators can only develop during the operation of the on-load tap-changer.

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

    The use of the OF 100 oil filter unit is not recommended for on-load tap-changers operating in dry climates.

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

    In operations above the dew point, dielectric properties of insulating fluid in on-load tap-changers are not affected.

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

    Study Notes

    Product Description

    • Motor-drive unit alters the on-load tap-changer's position based on control impulses, optimizing the transformer’s transmission ratio.
    • On-load tap-changer combines diverter switch and tap selector functions within a tubular design.
    • Insulating fluid is separated from transformer oil via a cylindrical pressure-proof compartment.
    • Unit comes shipped in an adjustment position, secure to the transformer via a dedicated head.

    Pressure Monitoring Device

    • DW 2000 device protects against excessive pressure, enhancing transformer safety.
    • Installed externally, it reacts to static and dynamic pressures in the oil compartment.
    • Utilizes a corrugated tube with a spring for sensing, linking to a snap-action switch that triggers the circuit breaker if pressure exceeds set levels.
    • Requires manual reset post-tripping; low-energy interference does not cause false tripping.

    Safety Devices

    • Rupture disk acts as a pressure relief mechanism adhering to IEC 60214-1, positioned on the tap-changer head cover.
    • Option for MPreC® pressure relief device that also meets IEC standards, available upon request.

    Temperature Monitoring

    • System monitors insulating fluid temperature in the oil compartment, allowing temperature checks via a compatible tool.
    • Inspection window assists in verifying operating position—excessive overshooting is to be avoided.

    Maintenance and Operation

    • For multiple-column setups, horizontal drive shafts must connect the on-load tap-changer heads.
    • Specific procedures for movement include cranking the drive shaft post-operation for complete tap-change.
    • Transformer ratio tests must be conducted in all positions, followed by necessary drying and sealing processes.

    Mounting Procedure

    • Heating protocol includes gradual temperature increase to maximum 110 °C.
    • Pre-drying should occur at upward of 110 °C for 20 hours, followed by vacuum drying at 105-125 °C for at least 50 hours.
    • Securing head cover requires careful handling of o-ring and sealing surfaces to prevent insulating fluid leakage.
    • Proper alignment of markings on head and cover is essential during installation.

    Intended Use

    • Products must be used only with the specified transformer or motor-drive unit listed in the order.
    • Serial numbers of on-load tap-changer and associated accessories must match when supplied as a set.
    • Valid standards and issue year can be found on the product's nameplate.
    • Products should be operated according to the technical file, agreed delivery conditions, and technical data.
    • Only qualified personnel should perform necessary work on the equipment.
    • Utilize only equipment and special tools included in the delivery and as specified in technical documents.

    Operating Conditions

    • The on-load tap-changer is designed for sinusoidal 50/60 Hz alternating current.
    • It can switch 2 times the rated through-current (Ir) at the rated step voltage (Uir).
    • Key components of the on-load tap-changer are detailed in installation drawings included in the appendix.

    Product Description

    • Reference maximum operating positions for the on-load tap-changer in technical data.
    • The on-load tap-changer head contains 4 pipe connections for various functions, some fitted with pipe bends at the factory.

    Pipe Connections

    • Pipe connection Q is designated for connecting the oil filter unit, closed with a blank cover.
    • Functions of pipe connections R and Q can be interchanged.

    Pressure Monitoring Device

    • The DW 2000 device protects the on-load tap-changer from excessive pressure.
    • It is triggered by static and dynamic pressures in the oil compartment.
    • Utilizes a corrugated tube and spring mechanism to activate a sensor that de-energizes the transformer when pressure increases.
    • The device requires manual reset post-tripping and is unaffected by low-energy interference.

    Drive Shaft Configuration

    • Drive shaft without cardan joint or insulator has specific configuration details, including allowable axial offsets.
    • An intermediate bearing is necessary when shaft lengths exceed specified limits.

    Packaging, Transport, and Storage

    • Incorrect stacking of crates can damage contents, emphasizing the need for following outer packaging instructions.
    • Crates should not be stacked above 1.5 m; up to 2 equally sized crates can be stacked.
    • Packaging is designed to comply with transportation laws and includes sturdy crates with protective features against humidity.
    • Markings provide instructions for safe transport and proper storage adherence.

    Spare Parts and Modifications

    • Consult Maschinenfabrik Reinhausen GmbH before modifying any product.
    • Non-approved spare parts may cause physical injury, product damage, and malfunctions.
    • Always use officially approved spare parts for safety and reliability.

    Personnel Qualifications

    • Personnel responsible for assembly, commissioning, operation, maintenance, and inspection must be adequately qualified.
    • An electrically skilled person possesses technical qualifications, knowledge of standards, and the ability to identify and avoid potential hazards.
    • Electrically trained persons require guidance from an electrically skilled person regarding their tasks and hazards.

    Safety Measures and Procedures

    • Prevent static charge build-up near transformers during commissioning to mitigate explosion risks.
    • Use conductive and grounded equipment approved for flammable liquids.
    • Overloading the on-load tap-changer poses explosion hazards and significant risks of injury and property damage.

    Commissioning the Transformer

    • Only approved insulating fluids should be used in the on-load tap-changer’s oil compartment to prevent damage.
    • A pressure relief device must be installed if the tap-changer head cover has a flange for it.

    Protective Relay and Pressure Monitoring Device Checks

    • Before commissioning, ensure the protective relay is functioning correctly.
    • Perform active and passive protection tests by grounding the transformer and checking various states of the circuit breaker and sensor positions.
    • For pressure monitoring, verify that the transformer is de-energized, and ensure all connections remain intact during testing.

    Fault Response and Re-Commissioning

    • Upon tripping of the pressure monitoring device, immediate consultation with Maschinenfabrik Reinhausen is required to assess potential damages.
    • Detailed records must be kept regarding the tripping circumstances and any related protective device responses.
    • Re-commissioning can occur only after verifying the protective relay's functionality and addressing the causes of the trip.

    General Warnings

    • Inadequately tested equipment poses extreme risks of severe injury or death.
    • Always confirm the integrity of the on-load tap-changer and transformer before resuming operations.

    Warning Notices and Pictograms

    • Pictograms indicate specific dangers: danger points, dangerous electrical voltage, combustible substances, risk of tipping, and crushing hazards.
    • Information systems in technical files aim to simplify understanding of procedures.

    Instruction Systems

    • Single-step instructions outline aim, optional requirements, one step, and optional results.
    • Multi-step instructions structure includes aim, optional requirements, sequential steps, and optional results for each step.

    Drive Shaft Specifications

    • Standard version of drive shaft lacks cardan joint and insulator.
    • Key component dimensions include: middle of hand crank to middle of bevel gear at 536 mm.
    • Maximum axial offset is 2°; an intermediate bearing is required if exceeded.

    Oil Filter Unit Recommendations

    • For on-load tap-changers with >15,000 operations/year, use OF 100 oil filter unit to extend maintenance intervals.
    • In humid tropical/subtropical climates, a combined filter insert is needed to maintain dielectric properties under high humidity and low temperatures.

    Commissioning Precautions

    • Danger of explosion is noted related to explosive gases in oil compartments; all ignition sources must be eliminated.
    • Incomplete bleeding of suction pipes impairs insulation capability; bleeding is essential to ensure operational integrity.

    Maintenance and Operational Notices

    • Ensure on-load tap-changer is fully immersed in insulating fluid to avoid damage; complete filling is critical.
    • Incorrect connections of position transmitter equipment can damage both the tap-changer and motor-drive unit; use specified circuits only.

    Re-commissioning Process

    • After resolving issues with the protective relay, conduct checks and ensure the transformer can be safely commissioned again.

    Fault Elimination Safety Warnings

    • Tripping of the pressure monitoring device poses serious safety risks; always consult Maschinenfabrik Reinhausen before reusing equipment to confirm safety.

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    Related Documents

    OILTAP® V Installation and Commissioning Instructions PDF
    OILTAP® V Installation and Commissioning Instructions PDF
    OILTAP® V Operating Instructions PDF
    OILTAP® V Operating Instructions PDF

    Description

    Explore the functionalities of the OILTAP® V motor-drive unit, designed to change the operating position of on-load tap-changers. This unit plays a crucial role in adapting the transformer's transmission ratio according to controlling impulses like those received from a voltage regulator. Gain insights into its engineering and operation principles.

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