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Questions and Answers
What is the maximum rated through current Ium for the VRF I 2602 model?
What is the maximum rated through current Ium for the VRF I 2602 model?
Which rated peak withstand current (kA) corresponds to the VRE I 1001 model?
Which rated peak withstand current (kA) corresponds to the VRE I 1001 model?
What is the rated short-time current (kA) for the VRG I 1601 model?
What is the rated short-time current (kA) for the VRG I 1601 model?
Which model has a maximum rated step voltage that can be exceeded by 10%?
Which model has a maximum rated step voltage that can be exceeded by 10%?
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What is the step capacity (PStN) in kVA for the VRF I 2602 model?
What is the step capacity (PStN) in kVA for the VRF I 2602 model?
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What is the maximum rated through current for the VRC II 552 model?
What is the maximum rated through current for the VRC II 552 model?
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What is the rated peak withstand current for the VRF II 1302 model?
What is the rated peak withstand current for the VRF II 1302 model?
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Which of the following models has the highest step capacity?
Which of the following models has the highest step capacity?
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What is the rated duration of short-circuits for all models listed?
What is the rated duration of short-circuits for all models listed?
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Which model has a maximum rated step voltage greater than the others?
Which model has a maximum rated step voltage greater than the others?
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What is the maximum rated step voltage for the VACUTAP® VRC III series?
What is the maximum rated step voltage for the VACUTAP® VRC III series?
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Which VACUTAP® VRC/VRE III model has the highest rated peak withstand current?
Which VACUTAP® VRC/VRE III model has the highest rated peak withstand current?
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What is the rated capacity (PStN) for the VACUTAP® VRC III 550 Y model?
What is the rated capacity (PStN) for the VACUTAP® VRC III 550 Y model?
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How long is the rated duration of short-circuits for all VACUTAP® VRC/VRE III models?
How long is the rated duration of short-circuits for all VACUTAP® VRC/VRE III models?
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What is the maximum rated current (Ium(in) A) for the VACUTAP® VRE III 700 Y model?
What is the maximum rated current (Ium(in) A) for the VACUTAP® VRE III 700 Y model?
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Which VACUTAP® model includes a tie-in resistor cylinder without potential switches?
Which VACUTAP® model includes a tie-in resistor cylinder without potential switches?
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Which tap selector size corresponds with the VACUTAP® VRD/VRF models listed under item 4.62?
Which tap selector size corresponds with the VACUTAP® VRD/VRF models listed under item 4.62?
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What is the purpose of the bridges mentioned for VACUTAP® VRF and VRG models?
What is the purpose of the bridges mentioned for VACUTAP® VRF and VRG models?
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What component is specified for the arrangement of potential switches in the VACUTAP® VRD/VRF?
What component is specified for the arrangement of potential switches in the VACUTAP® VRD/VRF?
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Which item number corresponds to the VACUTAP® VRD/VRF with the tie-in resistor cylinder described as size C/D?
Which item number corresponds to the VACUTAP® VRD/VRF with the tie-in resistor cylinder described as size C/D?
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Which of the following is NOT included in the item descriptions for VACUTAP® VR series components?
Which of the following is NOT included in the item descriptions for VACUTAP® VR series components?
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What is the primary difference highlighted between the VACUTAP® VRD/VRF and VRG models based on the item descriptions?
What is the primary difference highlighted between the VACUTAP® VRD/VRF and VRG models based on the item descriptions?
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Identify the item number that references the VACUTAP® VRD/VRF model with a potential switch and tie-in resistor cylinder.
Identify the item number that references the VACUTAP® VRD/VRF model with a potential switch and tie-in resistor cylinder.
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Which item indicates a VACUTAP® model connection that lacks both potential switches and tie-in resistors?
Which item indicates a VACUTAP® model connection that lacks both potential switches and tie-in resistors?
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Among the VACUTAP® models listed, which one is tagged with the identifier number 899955?
Among the VACUTAP® models listed, which one is tagged with the identifier number 899955?
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What is the significance of the tap selector size 'E' in the VRG versions?
What is the significance of the tap selector size 'E' in the VRG versions?
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How are the rated withstand voltages for the internal insulation determined?
How are the rated withstand voltages for the internal insulation determined?
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Which diagrams specifically relate to electrical arc furnace operations?
Which diagrams specifically relate to electrical arc furnace operations?
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What information does the step capacity diagram provide?
What information does the step capacity diagram provide?
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Which of the following statements is accurate regarding the versions of tap-changers?
Which of the following statements is accurate regarding the versions of tap-changers?
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What does the term 'rated through current' refer to in the context of step capacity diagrams?
What does the term 'rated through current' refer to in the context of step capacity diagrams?
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Which diagram is indicated to be relevant for both electrical arc furnace and ladle furnace operation?
Which diagram is indicated to be relevant for both electrical arc furnace and ladle furnace operation?
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In what context is it advised to contact MR for additional information?
In what context is it advised to contact MR for additional information?
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What is primarily shown in the step capacity diagrams?
What is primarily shown in the step capacity diagrams?
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Which figure would provide information about the rated step voltages during electrical arc furnace operation?
Which figure would provide information about the rated step voltages during electrical arc furnace operation?
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The maximum rated through current Ium for the VRE I HD 701 model is 700 A.
The maximum rated through current Ium for the VRE I HD 701 model is 700 A.
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All models listed have a rated duration of short-circuits equal to 5 seconds.
All models listed have a rated duration of short-circuits equal to 5 seconds.
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The step capacity for the VRD I HD 1301 model is 1500 kVA.
The step capacity for the VRD I HD 1301 model is 1500 kVA.
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The rated peak withstand current for the VRG I HD 1001 model is more than 25 kA.
The rated peak withstand current for the VRG I HD 1001 model is more than 25 kA.
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The maximum rated step voltage for the VRD I HD 1301 model is 4000 V.
The maximum rated step voltage for the VRD I HD 1301 model is 4000 V.
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The insulation distance labeled 'c2' refers to the spacing between identically-named, connected coarse tappings of different phases.
The insulation distance labeled 'c2' refers to the spacing between identically-named, connected coarse tappings of different phases.
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The insulation distance 'a1' is defined as the distance between fine tap selector contacts of different tap positions.
The insulation distance 'a1' is defined as the distance between fine tap selector contacts of different tap positions.
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The insulation distance 'b' signifies the separation between fine tap selector contacts of different phases and the connected K contact of one phase with any points of the tapped winding of another phase.
The insulation distance 'b' signifies the separation between fine tap selector contacts of different phases and the connected K contact of one phase with any points of the tapped winding of another phase.
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The size D tap selector requires higher insulation distances compared to size B tap selector when considering 1.2/50 µs insulation levels.
The size D tap selector requires higher insulation distances compared to size B tap selector when considering 1.2/50 µs insulation levels.
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Insulation distance 'd1' refers to the interval between connected and adjacent coarse tap contacts within multiple phases.
Insulation distance 'd1' refers to the interval between connected and adjacent coarse tap contacts within multiple phases.
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The insulation distance 'f' specifies the relationship between the diverter switch output terminal and any ground connection.
The insulation distance 'f' specifies the relationship between the diverter switch output terminal and any ground connection.
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The definition for insulation distance 'c1' pertains only to the separation between fine tapping outputs and their diverter switch output terminals.
The definition for insulation distance 'c1' pertains only to the separation between fine tapping outputs and their diverter switch output terminals.
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The fine tap selector is only attached to one side of the multiple coarse change-over selector.
The fine tap selector is only attached to one side of the multiple coarse change-over selector.
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The VACUTAP® VRD/VRF I WP model includes a potential switch and tie-in resistor cylinder.
The VACUTAP® VRD/VRF I WP model includes a potential switch and tie-in resistor cylinder.
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The VACUTAP® VRC model is associated with item number 899973.
The VACUTAP® VRC model is associated with item number 899973.
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Item number 899941 refers to the VRD/VRF models' potential switch arrangement.
Item number 899941 refers to the VRD/VRF models' potential switch arrangement.
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The VACUTAP® VRG model lacks any connection contacts.
The VACUTAP® VRG model lacks any connection contacts.
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Item number 899968 depicts the bottom of the tap selector for size C/D models.
Item number 899968 depicts the bottom of the tap selector for size C/D models.
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The VACUTAP® VRF series allows connection to three-phase systems only.
The VACUTAP® VRF series allows connection to three-phase systems only.
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The tap selector size E is exclusive to the VACUTAP® VRF model range.
The tap selector size E is exclusive to the VACUTAP® VRF model range.
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The VACUTAP® VRD/VRF I HD WP model has the identifier number 899966.
The VACUTAP® VRD/VRF I HD WP model has the identifier number 899966.
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Item number 899969 describes the tap selector size D for the VRD/VRF range.
Item number 899969 describes the tap selector size D for the VRD/VRF range.
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The arrangement of potential switches for the VACUTAP® VRD/VRF models is referenced by item number 899950.
The arrangement of potential switches for the VACUTAP® VRD/VRF models is referenced by item number 899950.
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The tap selector size for VACUTAP® VRC models is represented by the letter 'B'.
The tap selector size for VACUTAP® VRC models is represented by the letter 'B'.
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The VACUTAP® VRD model has a maximum rated through current Ium of 2000 A.
The VACUTAP® VRD model has a maximum rated through current Ium of 2000 A.
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The 'I' in the on-load tap-changer designations symbolizes a single phase.
The 'I' in the on-load tap-changer designations symbolizes a single phase.
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Models VRF I and VRF II both fall under the same current rating of 550 A.
Models VRF I and VRF II both fall under the same current rating of 550 A.
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The maximum number of operating positions without change-over selector for VRF models is 12.
The maximum number of operating positions without change-over selector for VRF models is 12.
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The designation 'P' in the tap-changer model indicates a potential switch with tie-in resistor.
The designation 'P' in the tap-changer model indicates a potential switch with tie-in resistor.
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VACUTAP® VRG model types do not include any two-phase configurations.
VACUTAP® VRG model types do not include any two-phase configurations.
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The highest voltage rating included in the VACUTAP® model series is 300 kV.
The highest voltage rating included in the VACUTAP® model series is 300 kV.
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Maximally, the number of operating positions with a change-over selector for the models is 35.
Maximally, the number of operating positions with a change-over selector for the models is 35.
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The character 'R' in the designation indicates the use of a potential switch only.
The character 'R' in the designation indicates the use of a potential switch only.
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The designation 'Y' in the model indicates its applicability for neutral point only.
The designation 'Y' in the model indicates its applicability for neutral point only.
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The maximum number of mid-positions in a VACUTAP® model is 3.
The maximum number of mid-positions in a VACUTAP® model is 3.
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VACUTAP® VRD's maximum rated through current Ium for three-phase configurations is 1300 A.
VACUTAP® VRD's maximum rated through current Ium for three-phase configurations is 1300 A.
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The 'C' tap selector size is designated for both the VRC and VRD series.
The 'C' tap selector size is designated for both the VRC and VRD series.
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The VRF I series models have a tap selector size denoted as 'E'.
The VRF I series models have a tap selector size denoted as 'E'.
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The maximum rated through current Ium for the VACUTAP® VRC I 1001 model is $1000 A$.
The maximum rated through current Ium for the VACUTAP® VRC I 1001 model is $1000 A$.
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All models listed have a rated duration of short-circuits of $5 s$.
All models listed have a rated duration of short-circuits of $5 s$.
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The rated peak withstand current for VRC I 1301 is $37.5 kA$.
The rated peak withstand current for VRC I 1301 is $37.5 kA$.
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A maximum rated step voltage of $3300 V$ is consistent across all VACUTAP® VRC/VRD I models.
A maximum rated step voltage of $3300 V$ is consistent across all VACUTAP® VRC/VRD I models.
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The rated short-time current for VRC I 701 is $12 kA$.
The rated short-time current for VRC I 701 is $12 kA$.
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Study Notes
VACUTAP® Tap-Changers Overview
- VACUTAP® series includes models like VRC, VRE, VRF, and VRG, tailored for specific electrical applications.
- Each model serves varying maximum rated through currents ranging from 400 A to 2600 A, designed for efficient operational capacity.
Technical Specifications
- VACUTAP® VRE/VRF/VRG I models have:
- Maximum rated through current: 700 A (VRE I) to 2600 A (VRF I)
- Rated short-time current: 10 kA to 26 kA
- Peak withstand current ranges up to 65 kA.
- VACUTAP® VRC/VRF/VRG II models demonstrate:
- Maximum rated current from 400 A to 1300 A.
- Rated short-time currents between 6 kA and 15 kA.
- VACUTAP® VRC/VRE III models operate with:
- Maximum rated through current of up to 700 A.
- Consistent rated short-time current capabilities of 6 kA to 10 kA.
Step Capacity
- Step capacity (PStN) varies across models, with significant values including:
- VRE series up to 6000 kVA.
- VRC/VRF/VRG II series offering step capacities from 1320 kVA to 3000 kVA.
- All models allow for a maximum rated step voltage (Vin) of 4000 V, with special considerations for transformer over-excitation.
Electrical Safety Features
- Rated peak withstand currents not only signify construction resilience but are also critical for short-circuit protection.
- Operation duration for short circuits across all variants is established at 3 seconds, safeguarding against prolonged exposure to electrical faults.
Application Diagrams and Use Cases
- Step capacity diagrams detail relationships between rated voltage and current, ensuring proper load handling in practical applications.
- Special diagrams illustrate step capacities during electrical arc furnace operations, showing adaptability to high-demand environments.
Summary of Key Features Across Series
- VRE I to VRF I series tailored for high-capacity needs with one-phase application.
- VRC II series designed for two-phase application, catering to different industrial demands.
- Advanced engineered variants such as VRG designed for specific tapp selector sizes, enhancing the flexibility of installation in existing infrastructures.
VACUTAP® Overview
- VACUTAP® product line includes various models such as VRC, VRE, VRD, VRF, and VRG designed for on-load tap-changing operations.
- Models are indicated with specific type designations reflecting the configurations and applications, e.g., VRF I 1301 Y – 245 / C– 10 19 1W R.
On-load Tap-Changer Designations
- First letter indicates the model: VRC (Vacutap) or VRD, VRF etc.
- Number of phases is represented as Roman numerals: I (1 phase), II (2 phases), III (3 phases).
- Rated current (Ium) varies by model, with maximum values ranging from 400 A to 2600 A.
- Step selector sizes are identified with letters B, C, D, and E, depending on the model's capacity.
Technical Specifications
- Rated short-time currents range from 6 kA to 15 kA, dependent on the specific model.
- The maximum rated voltage can reach up to 4000 V, illustrating the tap-changer’s operational capacity.
- The rated duration for short-circuits across models is consistent at 3 seconds.
- Step capacity (PStN) varies; powerful models can achieve capacities up to 3750 kVA.
Insulation Distances
- Insulation distances are critical for safe operation and are specified for various tap selector sizes: B, C, D.
- Insulation distances include metrics for transient surge (1.2/50 µs), power frequency (50 Hz), and standard 1-minute tests.
- Specific measurements of insulation distances ensure safe operation under voltage stress, preventing faults.
Additional Features
- The VACUTAP® VR I HD version is available for applications requiring a higher number of tap-change operations.
- Available options for tie-in measures include resistors and potential switches to ensure operational versatility.
- Tap selectors are designed to accommodate multiple coarse change-over selectors, enhancing functionality in complex systems.
Summary of Performance Capacities
- Different models provide maximum currents ranging from 400 A (VRC I 401) to 1300 A (VRE I HD 1301) ensuring scalability based on operational requirements.
- The design promotes safety and efficiency during regulated voltage control, crucial in electrical grid management.
Considerations for Use
- Models tailored for diverse applications must consider the rated current and switching arrangements essential for system compatibility.
- Higher capacities may necessitate comprehensive insulation assessments to uphold performance and safety standards.
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Description
This quiz covers the specific functions and connections of the VACUTAP® VRC/VRE and VRD/VRF/VRG components. You will explore details about tie-in resistor cylinders, fine tap selectors, and their respective connections. Prepare to test your knowledge on these critical electrical components.
