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Questions and Answers
What is the rated duration of short circuits for all models of VACUTAP® VRD/VRF/VRG III?
What is the rated duration of short circuits for all models of VACUTAP® VRD/VRF/VRG III?
Which VACUTAP® model has the lowest maximum rated through current?
Which VACUTAP® model has the lowest maximum rated through current?
What is the maximum rated step voltage for the VACUTAP® VRF III models?
What is the maximum rated step voltage for the VACUTAP® VRF III models?
For the VACUTAP® models, what is the rated peak withstand current for the VRD III 1300 Y?
For the VACUTAP® models, what is the rated peak withstand current for the VRD III 1300 Y?
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Which of the following models has a step capacity of 3000 kVA?
Which of the following models has a step capacity of 3000 kVA?
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What is a key characteristic that differentiates the VACUTAP VR® I from the VR® III model?
What is a key characteristic that differentiates the VACUTAP VR® I from the VR® III model?
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Which component describes the VACUTAP® VRC's ability to handle electrical arc furnace operations?
Which component describes the VACUTAP® VRC's ability to handle electrical arc furnace operations?
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In the context of on-load tap-changers, what does the abbreviation HD signify?
In the context of on-load tap-changers, what does the abbreviation HD signify?
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Which of the following is NOT typically considered in the technical data of an on-load tap-changer?
Which of the following is NOT typically considered in the technical data of an on-load tap-changer?
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Which aspect of the VACUTAP® series involves alterations since the time of publication?
Which aspect of the VACUTAP® series involves alterations since the time of publication?
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What is the primary purpose of the step capacity diagram for the VACUTAP® VRC?
What is the primary purpose of the step capacity diagram for the VACUTAP® VRC?
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Which section within the document would you refer to for specific operational connections?
Which section within the document would you refer to for specific operational connections?
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What is a potential liability concern according to the content provided?
What is a potential liability concern according to the content provided?
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Which step capacity diagram corresponds to the VRD, VRF, VRG models under electrical arc furnace operation?
Which step capacity diagram corresponds to the VRD, VRF, VRG models under electrical arc furnace operation?
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What is the primary purpose of the rated insulation level in the context of VACUTAP® models?
What is the primary purpose of the rated insulation level in the context of VACUTAP® models?
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What is the maximum operating voltage on the individual tap selector distances relative to the rated short-duration power frequency withstand voltages?
What is the maximum operating voltage on the individual tap selector distances relative to the rated short-duration power frequency withstand voltages?
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What response voltage is specified for the varistor at 1.2/50 µs lightning impulse?
What response voltage is specified for the varistor at 1.2/50 µs lightning impulse?
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What is the residual voltage at a peak current of 3 kA for the varistor?
What is the residual voltage at a peak current of 3 kA for the varistor?
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Which of the following distances is omitted for single-pole on-load tap-changers?
Which of the following distances is omitted for single-pole on-load tap-changers?
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Which rated withstand voltage corresponds to the insulation of the internal on-load tap-changer?
Which rated withstand voltage corresponds to the insulation of the internal on-load tap-changer?
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What is the maximum rated through current for the VACUTAP® VRC I HD model?
What is the maximum rated through current for the VACUTAP® VRC I HD model?
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Which model has the highest rated peak withstand current?
Which model has the highest rated peak withstand current?
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How long is the rated duration of short-circuits for the VACUTAP® VRC I HD models?
How long is the rated duration of short-circuits for the VACUTAP® VRC I HD models?
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What is the step capacity (PStN) of the VRC I HD 701 model?
What is the step capacity (PStN) of the VRC I HD 701 model?
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Which of the following statements is true regarding the maximum rated step voltage?
Which of the following statements is true regarding the maximum rated step voltage?
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What does the VACUTAP® VRC/VRE model incorporate without tie-in resistors?
What does the VACUTAP® VRC/VRE model incorporate without tie-in resistors?
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Which VACUTAP® model utilizes the part number 899941?
Which VACUTAP® model utilizes the part number 899941?
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For which VACUTAP® model is the size E tap selector specifically mentioned?
For which VACUTAP® model is the size E tap selector specifically mentioned?
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What is a common feature of the VACUTAP® VRD/VRF models with size C/D?
What is a common feature of the VACUTAP® VRD/VRF models with size C/D?
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Which part number corresponds to the VACUTAP® VRD/VRF, size C/D, with a potential switch?
Which part number corresponds to the VACUTAP® VRD/VRF, size C/D, with a potential switch?
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What feature does the VACUTAP® VRD/VRF III WR model include?
What feature does the VACUTAP® VRD/VRF III WR model include?
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Which of the following models accurately describes one that includes potential switches?
Which of the following models accurately describes one that includes potential switches?
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What is specifically depicted in the VACUTAP® VRD/VRF, size C/D documentation?
What is specifically depicted in the VACUTAP® VRD/VRF, size C/D documentation?
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Which part number is associated with the VACUTAP® VRG, size E model?
Which part number is associated with the VACUTAP® VRG, size E model?
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Which part number identifies the tap selector bottom depiction of the VACUTAP® VRD/VRF, size C/D?
Which part number identifies the tap selector bottom depiction of the VACUTAP® VRD/VRF, size C/D?
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The maximum rated through current for the VACUTAP® VRF III 1300 Y model is greater than that of the VRD III 1000 Y model.
The maximum rated through current for the VACUTAP® VRF III 1300 Y model is greater than that of the VRD III 1000 Y model.
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The rated peak withstand current for all models of VACUTAP® VRD/VRF/VRG III is the same at 30 kA.
The rated peak withstand current for all models of VACUTAP® VRD/VRF/VRG III is the same at 30 kA.
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The rated duration of short-circuits for all the models listed is 5 seconds.
The rated duration of short-circuits for all the models listed is 5 seconds.
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The maximum rated step voltage for the VACUTAP® VRD III 1000 Y model is 4000 V.
The maximum rated step voltage for the VACUTAP® VRD III 1000 Y model is 4000 V.
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The step capacity (PStN) for the VACUTAP® VRF III 1300 Y model is 1500 kVA.
The step capacity (PStN) for the VACUTAP® VRF III 1300 Y model is 1500 kVA.
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The maximum rated through current for the VACUTAP® VRC I model is 700 A.
The maximum rated through current for the VACUTAP® VRC I model is 700 A.
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All models of the VACUTAP® VRC I have a rated duration of short-circuits of 3 seconds.
All models of the VACUTAP® VRC I have a rated duration of short-circuits of 3 seconds.
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The rated peak withstand current for the VACUTAP® VRC I 1001 model is 12 kA.
The rated peak withstand current for the VACUTAP® VRC I 1001 model is 12 kA.
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The step capacity for the VACUTAP® VRC I 1301 model is higher than that of the VRC I 701 model.
The step capacity for the VACUTAP® VRC I 1301 model is higher than that of the VRC I 701 model.
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An over-excitation of the transformer can allow the maximum rated step voltage to exceed its value by 10%.
An over-excitation of the transformer can allow the maximum rated step voltage to exceed its value by 10%.
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The VACUTAP VR® I HD series includes multiple coarse change-over selectors.
The VACUTAP VR® I HD series includes multiple coarse change-over selectors.
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On-load tap-changer models are unaffected by changes in technical data after publication.
On-load tap-changer models are unaffected by changes in technical data after publication.
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The section referring to parallel connections is outlined in section 3 of the document.
The section referring to parallel connections is outlined in section 3 of the document.
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Step capacity diagrams for electrical arc furnace operation are not included in the documentation.
Step capacity diagrams for electrical arc furnace operation are not included in the documentation.
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The insulation level for VACUTAP® models is discussed in section 1.3 of the document.
The insulation level for VACUTAP® models is discussed in section 1.3 of the document.
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The product information might be subject to intellectual property rights.
The product information might be subject to intellectual property rights.
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The rated withstand voltages of internal insulation are covered in section 3.4.
The rated withstand voltages of internal insulation are covered in section 3.4.
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The maximum rated through current for the VACUTAP® VRC I HD model is stated in section 2.1.
The maximum rated through current for the VACUTAP® VRC I HD model is stated in section 2.1.
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On-load tap-changers are designed only for delta connections.
On-load tap-changers are designed only for delta connections.
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All operating instructions for VACUTAP® models were originally written in German.
All operating instructions for VACUTAP® models were originally written in German.
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The insulation distance 'c2' refers to the area between diverter switch output terminal and ground.
The insulation distance 'c2' refers to the area between diverter switch output terminal and ground.
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Tap selector size E has a maximum insulation withstand voltage of 670 kV.
Tap selector size E has a maximum insulation withstand voltage of 670 kV.
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The rated withstand voltage for tap selector size D during 1.2/50 µs is only 20 kV.
The rated withstand voltage for tap selector size D during 1.2/50 µs is only 20 kV.
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Insulation distances for tap selector size C and size D are the same for the maximum rated voltage of 1500 kV.
Insulation distances for tap selector size C and size D are the same for the maximum rated voltage of 1500 kV.
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The maximum insulation distances of the the tap selection options are all the same for both diverter switch output terminal and change-over selector contacts.
The maximum insulation distances of the the tap selection options are all the same for both diverter switch output terminal and change-over selector contacts.
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'a' represents the insulation distance with a maximum of 670 kV in the fine tap selector contacts.
'a' represents the insulation distance with a maximum of 670 kV in the fine tap selector contacts.
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The rating for 'b' is higher than that of 'c1' in terms of insulation distances.
The rating for 'b' is higher than that of 'c1' in terms of insulation distances.
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The document notes that there are available tap selectors for the basic connection diagrams 16 15 1 W and 18 17 1 W.
The document notes that there are available tap selectors for the basic connection diagrams 16 15 1 W and 18 17 1 W.
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The insulation distance labeled 'b' is between the fine tap selector contacts of different phases and the output terminal of one phase.
The insulation distance labeled 'b' is between the fine tap selector contacts of different phases and the output terminal of one phase.
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Insulation distance 'a1' indicates the distance between selected and preselected taps on the diverter switch.
Insulation distance 'a1' indicates the distance between selected and preselected taps on the diverter switch.
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The rated withstand voltage for insulation distances is specified for multiple conditions including 1.2/50 μs and 50 Hz.
The rated withstand voltage for insulation distances is specified for multiple conditions including 1.2/50 μs and 50 Hz.
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Insulation distance 'c2' is defined as the distance between connected coarse tappings of the same phase.
Insulation distance 'c2' is defined as the distance between connected coarse tappings of the same phase.
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The distance 'd2' refers to the space between connected and adjacent coarse tap contacts in one phase.
The distance 'd2' refers to the space between connected and adjacent coarse tap contacts in one phase.
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The tap selector size 'C' is associated with the highest rated insulation distances at 1.2/50 µs.
The tap selector size 'C' is associated with the highest rated insulation distances at 1.2/50 µs.
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Insulation distance 'd3' encompasses the distance between any coarse tappings of a particular phase.
Insulation distance 'd3' encompasses the distance between any coarse tappings of a particular phase.
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The diverter switch output terminal distance 'f' measures insulation distance to ground but does not account for other phases.
The diverter switch output terminal distance 'f' measures insulation distance to ground but does not account for other phases.
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Study Notes
On-Load Tap-Changer Overview
- VACUTAP VR® series includes models I, II, III, and VR I HD, designed for transformer applications.
- On-load tap-changers adjust voltage levels in transformers without interrupting the power flow.
General Technical Data
- Designed for different applications with various models offering distinct specifications.
- Models like VRD, VRF, and VRG for three-phase operation, and VRC for single-phase.
- Maximum rated through currents range from 400 A to 1300 A across different models.
- Rated short-time currents range from 6 kA to 15 kA with a consistent duration of 3 seconds for circuit interruptions.
- Rated peak withstand currents vary from 15 kA to 37.5 kA depending on the model.
Step Capacity & Voltage Ratings
- Maximum rated step voltages for most models are 3300 V, with specific models rated for 4000 V.
- Step capacity (PStN) typically ranges from 1500 kVA to 3000 kVA.
Insulation & Design Features
- Insulation levels must adhere to specified standards to ensure operational safety.
- Models available with multiple coarse change-over selectors for enhanced operational flexibility.
- Admissible maximum operating voltage on individual tap selectors is half the rated withstand voltages.
Special Model Insights
- VACUTAP® VRC I HD series with variations from 401 to 1301 offer tailored solutions for specific power needs.
- Includes features such as potential switches and tie-in resistors for added functionality.
Diagrams & Capacity Details
- Step capacity diagrams illustrate operational limits for various models under different configurations, including electrical arc furnace applications.
- Detailed capacity diagrams inform users of the operational capabilities specific to each model variant.
Compliance & Legal Notices
- Document prohibits unauthorized reproduction and use. Liability for infringements is outlined.
- Original operating instructions are available in German, emphasizing the importance of accurate translation for operational guidance.
General Overview
- VACUTAP VR® I II III/VR® I HD are types of on-load tap-changers designed for electrical applications.
- Usage of these tap-changers ensures voltage stabilization in transformers, enhancing efficiency in power distribution.
On-Load Tap-Changer Designations
- Designations include VRC I, VRD I, VRF I, and VRG I, applicable for both single-phase and three-phase systems.
- Models are categorized based on maximum rated through current and application specifics.
Technical Data Summary
- Maximum rated through current varies from 400 A to 1300 A depending on the model.
- Rated short-time current ranges from 6 kA to 15 kA per model.
- Rated duration of short-circuits consistently set at 3 seconds across models.
- Rated peak withstand current increases from 15 kA to 37.5 kA as current capacity rises.
- Step capacity (PStN) for VRC I series is primarily 1500 kVA, while for VRD/VRF/VRG III it can be up to 3000 kVA.
Insulation Levels
- Rated insulation levels dictate design safety against electrical surges.
- Insulation distances measured in kV, with different tap selector sizes demonstrating varying maximums.
- Insulation for tap selectors ranges from a minimum of 20 kV to higher ratings depending on size and configuration.
Special Designs
- Features parallel bridges for enhancing connection robustness.
- Compatible with multiple coarse change-over selectors for increased operational versatility.
- VACUTAP® models support delta connections for complex electrical configurations.
Important Diagrams
- Step capacity diagrams illustrate operational limits and capabilities for various models under electrical arc furnace operations and standard conditions.
- Rated withstand voltages of internal insulation provide critical data for application boundaries and safety.
Summary of Critical Values
- VRC I models: Maximum rated through current from 400 A to 1300 A with a steady amp capacity of 3300 V.
- VRD III/VRF III/VRG III series support greater power demands with maximum current ratings extending up to 1300 A.
- Insulation distances calculated for operational safety in high-capacity environments.
Operational Notes
- Maximum rated step voltage can allow for a 10% excess due to specific transformer over-excitation scenarios.
- Understanding each model's specifications is essential for proper selection in industrial applications.
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Description
Explore the technical specifications and features of the VACUTAP VR® I II III and VR® I HD on-load tap-changer. This quiz will test your knowledge on the various aspects of these devices, their applications, and technical data. Perfect for those looking to deepen their understanding of modern electrical equipment.
