Questions and Answers
What is the weight of the transformer without change-over selector at a 300 kV voltage?
What is the displacement volume at 170 kV according to the provided data?
What is the minimum oil filling quantity for the diverter switch compartment at 245 kV?
Which of the following statements about the maximum rated step voltage is true?
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How much oil is required for the 300 kV configuration?
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Which tap-changer model has a weight of 505 kg with change-over selector at 170 kV?
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What is the displacement volume for the model R I 1201 at 123 kV?
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Which transformer model has the highest weight with change-over selector at 72.5 kV?
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What does the mean expected contact life of the arcing diverter switch contacts depend on?
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In which service condition does the contact life estimation not apply?
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What is represented by $Iu$ in the context of arcing diverter switch contacts?
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What type of service must be observed for the arcing diverter switch contacts?
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What is indicated about the R I 2402 model according to the technical data?
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What is not necessary when using the on-load tap-changer models mentioned?
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Which of the following models is a special design in the context of the technical data?
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Which statement about rated withstand voltages of internal insulation is accurate?
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What is the rated through-current (Iu) for the on-load tap-changer R I 2402?
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Which on-load tap-changer has a rated step voltage (Ui) of 4000 V?
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What is the step capacity (PStN) for the on-load tap-changer R I 3003?
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Which rated step voltage (Ui) is associated with the highest rated step capacity (PStN) in the provided data?
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Which on-load tap-changer has the lowest rated step voltage (Ui) of 2000 V?
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Identify the correct rated through-current (Iu) for the on-load tap-changer R I 1201.
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What is the step capacity (PStN) for the on-load tap-changer R I 2402?
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Which of the following on-load tap-changers has a rated through-current (Iu) of 3000 A?
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What does 'c1' represent in the coarse tapping arrangement for the change-over selector?
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What is the rated withstand voltage for the transition resistor with R2 < 2.33 Ω for selector size C?
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Which table presents the rated withstand voltages of the inner insulation of the selectors?
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What is the maximum rated withstand voltage for selector size E when R2 ≥ 2.33 Ω?
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Which option incorrectly describes the transition resistor rating for the selectors?
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What does 'b 5)' refer to in the rated withstand voltage data?
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How many phases are involved in the contact relationships for 'c2'?
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Which selector size has a maximum result of 400 kV for rated withstand voltage in any configuration?
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Which of the following on-load tap-changer models has a tap selector size of C/D?
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Which component is mentioned as having an installation drawing specifically for tap selector size E?
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What is the purpose of the tie-in resistors mentioned for the on-load tap-changer?
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Which feature is associated with the OILTAP® R III 1200 tap change configuration?
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What does the term 'tap selector bottom' refer to in the drawings?
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What type of design is specified for the on-load tap-changer installed in bell-type tanks?
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Which model includes an additional drawing for terminal contacts associated with size E?
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Which of these parts are detailed concerning pressure relief in the context of on-load tap-changers?
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What do the documentation numbers in the content primarily represent?
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What is the primary function of the potential switch in the on-load tap-changer?
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The transformer technical data is intended solely for the operation and maintenance departments.
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The rated withstand voltages listed apply to both internal insulation and external conditions of the transformer.
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An on-load tap-changer model may incorporate multiple tap positions for adjusting voltage levels.
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In the context of transformers, step capacity indicates the amount of power that can be handled in a single step transition.
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Selector size C is associated with a maximum rated withstand voltage of 200 kV.
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The maximum result for the rated withstand voltage is uniform across all selector sizes.
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The contact life estimation applies to all operating conditions without exceptions.
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Pressure relief details for on-load tap-changers are included in the appendix section of the technical data.
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The maximum rated lightning impulse withstand voltage stress should be adhered to on the tap selector in mid-position.
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The stress between beginning and end of a tapped winding is represented as 'b'.
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Adhering to the permissible withstand voltage 'a' is important when stressing with impulse voltage.
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The coarse tap selector can only be positioned in a single direction at any time.
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The rated through-current (Iu) for the on-load tap-changer R I 3003 is 1300 A.
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The rated withstand voltage 'a1' is defined as between the tap selector contacts of the winding of one tap position that are connected.
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The rated step voltage (Ui) for the R I 2002 model is 2200 V.
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When in the coarse tapping arrangement within a change-over selector, the end of a coarse tap winding is connected to the K tap selector contact.
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On-load tap-changer R III 1200 Y has a step capacity (PStN) of 3000 kVA.
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The model R I 2402 is a standard design without any special configurations.
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The maximum stress 'a0' occurs between preselected and selected tapping on the diverter switch.
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The change-over selector is relevant only for two-phase systems.
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For the on-load tap-changer R I 2003, the rated step capacity (PStN) reaches up to 5200 kVA.
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The highest rated through-current (Iu) listed is for the R I 24021 model at 3000 A.
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The on-load tap-changer R I 1201 has a rated step voltage (Ui) of 3000 V.
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The rated step capacities (PStN) for the R I 2402 model is correlated with a step voltage of 4000 V.
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The rated withstand voltage for selector size D is 110 kV when R2 ≥ 2.33 Ω.
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A transition resistor with R2 < 2.33 Ω has a maximum withstand voltage of 30 kV for selector size C.
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The insulation distances for selector size E at 1.2/50 µs are rated at 670 kV.
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The value of 'c2' pertains to the change-over selector contacts of the same phase.
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The maximum rated withstand voltage for selector size C when R2 < 2.33 Ω is 27 kV.
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The rated withstand voltages for inner insulation are listed under Table 3.
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The transition resistor specified with a maximum of 150 is associated with size D.
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Selector size E has a rated withstand voltage of 250 kV for 'c2' contacts.
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The mean expected contact life of the arcing diverter switch contacts can be estimated using the actual load.
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The R I 2402 model utilizes forced current division by three parallel winding branches.
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Inspection regulations are mandatory for assessing the contact life of the arcing diverter switch contacts.
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Figure 10 illustrates the voltage stress on the tap winding of single-pole on-load tap-changers only.
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The rated through-current Iu is the same as the maximum rated through-current Ium.
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Estimates for contact life are applicable only to constant current service.
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The statement regarding contact life applies universally without consideration of specific conditions.
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Only the R I 2003 model is considered a special design in the context of the provided data.
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Study Notes
On-Load Tap-Changer Specifications
- Various models: R III 1200 Y, R I 1201, R I 2002, R I 2402, R I 3003.
- Weight without change-over selector ranges from 360 kg to 525 kg.
- Weight with change-over selector ranges from 410 kg to 780 kg.
- Displacement volume varies by voltage level:
- 72.5 kV: 289 dm³
- 123 kV: 314 dm³
- 170 kV: 334 dm³
- 245 kV: 354 dm³
- 300 kV: 369 dm³
- Oil filling quantities for diverter switch compartments:
- 72.5 kV: 168 liters
- 123 kV: 188 liters
- 170 kV: 203 liters
- 245 kV: 218 liters
- 300 kV: 240 liters
Technical Data
- Rated Through-Current (Iu): Ranges from 700 A to 3000 A across models.
- Rated Step Voltage (Ui): Ranges from 2000 V to 4000 V.
- Step Capacity (PStN): Varies by model, with maximums up to 6000 kVA.
Additional Notes
- Maximum rated step voltage may be exceeded by 10% in case of transformer overexcitation.
- Special design options available for higher step capacities.
- Forced current division is necessary for R I 2402 with two parallel winding branches.
Contact Life and Insulation
- Expected contact life of arcing diverter switch contacts estimated based on relative load (Iu/Ium).
- Actual contact life influenced by many factors; specific procedures must be followed for inspections.
- Rated withstand voltages crucial for internal insulation as demonstrated in voltage stress diagrams. ### Technical Data of OILTAP® R On-load Tap-Changer
- Insulation distances specified for selector sizes C, D, and E indicate withstanding capacities for different voltage scenarios.
- Rated withstand voltages highlighted include:
- 1.2/50 µs for impulse test and 50 Hz, 1-minute power frequency test.
- Transition resistors are rated with a maximum of 150 kV for size C, D, and E selectors.
- Transition resistor values differ based on electrical specifications, with R2 values delineating two categories:
- R2 ≥ 2.33 Ω yields resistance of 150 kV with different withstand voltages.
- R2 < 2.33 Ω yields higher resistance values of up to 670 kV.
Connection and Selector Configuration
- Configuration identifiers such as c1 and c2 represent coarse tapping arrangements in connection schemes.
- c1: Measurement between one (-) change-over selector contact and the same phase terminal.
- c2: Measurement between (-) change-over selector contacts across different phases.
Drawings and Installation
- Dimensional and installation drawings exist for various OILTAP® R models including sizes C/D and E.
- Specific drawings and installation guidelines available for models R III 1200, R I 1201, R I 2002, and R I 3003 among others.
- Additional resources include jumpers for parallel connections and shielding details for tap selector size C/D.
Miscellaneous Features
- Detailed versions of on-load tap-changer head indicate configurations for different installation scenarios, including bell-type tanks.
- Horizontal drive shafts available for both selector sizes C/D and E cater to specific mounting requirements.
- Potential switches and tie-in resistors provide adaptability for different installations, ensuring compatibility across voltage ratings from 72.5 kV to 300 kV.
Safety and Compliance
- Emphasis on ensuring that operational specifications lie within the stated safety margins to prevent electrical failures during tap-changing operations.
- Proper installation and configuration as per outlined drawings ensure compliance with standard operational protocols.
Manufacturer Information
- Maschinenfabrik Reinhausen GmbH based in Regensburg, Germany, provides comprehensive support and information via their dedicated communication channels.
Overview of OILTAP® R On-load Tap-Changer
- Designed for transformer use, critical for efficient voltage regulation in electrical systems.
- Specifications meant for both designers and calculators of transformers.
Technical Data
- Rated through-currents (Iu) range from 700 A to 3000 A depending on the model.
- Rated step voltages (Ui) vary between models, spanning from 2000 V to 4000 V.
- Step capacities (PStN) can reach up to 6000 kVA, supporting diverse load demands.
Contact Life
- Mean expected contact life depends on the relative load ratio (Iu/Ium).
- Life expectancy estimations are influenced by operational conditions, not suitable for constant current service.
- Regular inspection regulations are essential for reliability.
Rated Withstand Voltages
- Rated withstand voltages crucial for tap winding protection against voltage stress.
- Important to verify that stress on tap selector does not exceed rated withstand limits.
- Specifications include various test voltages under specific conditions, ensuring safety and performance during surges or faults.
Insulation and Selector Sizes
- Different selector sizes (C, D, E) with varying insulation distances and withstand voltage ratings in kV.
- Maximum insulation distance specifications aid in mitigating risks associated with high voltage operations.
- Compliance with rated withstand voltage ensures operational safety, reducing risk of failures.
Notable Figures and Configurations
- Models include specific configurations such as R I 2003, R III 1200 Y, each designed for distinct operational scenarios.
- Design adjustments can be made for special conditions, highlighting adaptability within the system.
Application Cautions
- Users advised to seek specific expertise for industrial transformer applications, noting differences in operational demands compared to network services.
- Emphasis on adherence to safety guidelines, particularly during equipment selection and installation processes.
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Description
Test your knowledge on transformer specifications, including weight, oil filling quantities, and model details at various voltages. This quiz covers essential calculations and important statements regarding transformer operations and configurations.
