Transformer Magnetizing In-rush Current DarrellDesigner10 × Darrell Member for 10 years 4 months 624 designs 10 groups Title Description <p>This transformer design example demonstrates a current in-rush or "peaking" effect that depends on the phase or timing of the AC supply switch closure. A rather counter-intuitive result is shown;</p><p>Case 1: Set the initial_delay of the digital pulse to 4.17m seconds, which causes the switch to closed when the sinusoidal AC line input voltage is at its peak, one quarter-cycle at its 60 Hz frequency. The current into the primary winding will immediately follow its nominal steady-state no-load profile, with a peak of just under 100mA. </p><p>Case 2: Set the digital pulse initial_delay to 0 seconds, so that the line voltage is applied to the transformer immediately at its rising zero-crossing. This results in a large non-sinusoidal peaking current which exceeds 500mA on its initial cycle!</p><p>This is a direct result of saturation in the magnetic core. To produce the necessary "volt-seconds" in Case 2, the magnetic flux in the core must be twice that of Case 1. But if the transformer is sized such that its peak flux density is somewhat close to the the saturation level for nominal steady-state operation, then a start-up transient with the unfortunate timing of Case 2 will result in a large in-rush current.</p><p>Note that the flux density "b" is displayed for the magnetic core. The core saturation flux density is specified as 1.5 Tesla, a typical value for Electrical Steel. You can also select "B vs. H from Table" to see the performance for a specific type of NGO Electrical Steel -35PN250 from the manufacturer Posco.</p> About text formats Tags in-rushtransformermagnetic saturationmagnetic corePosco 35PN250Electrical Steel Select a tag from the list or create your own.Drag to re-order taxonomy terms. License - None - What's this? Design Titleby Darrell × Embed Design Copy Embed Code <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/embed-design/218541"></iframe> Embed Live Design Copy Embed Code <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/node/218541"></iframe> Share a Link Copy URL https://explore.partquest.com/node/218541 Inductor Model using Magnetic Circuit Modeling Method 瀧澤登Designer123146 × 瀧澤登 Member for 6 years 11 months 323 designs 3 groups Title Description <p>This example shows that you can build an inductor model from magnetic components (i.e. a winding and a core), and with an air-gap if needed. </p><p>You can run the nominal simulation with n = 23 turns on the winding, with the core model state set to "Linear" and a near-zero air-gap. The current transient in the winding matches the current in an ideal inductor model, both are representative of 1mH inductance. But in that configuration, the flux density "b" in the core is over 1.8 Tesla, well beyond the limits of a ferrite material.</p><p>You can set the magnetic core to "Non-linear with Saturation", and note that the saturation level is 525mT for the modeled core material. Then you can re-run the simulation to see the actual current profile that would result from this more realistic core behavior.</p><p>Finally, set the number of winding turns to 96. Then set the air-gap to 0.25mm, instead of the nominal 0.25um. This will restore the current rise profile that is expected for a 1mH inductor, but also keep the flux density in the core below the 525mT level.</p><p>It is also instructive to observe the energy stored in the ideal inductor, as well as the magnetic core and the air-gap, in each of the cases above.</p> About text formats Tags magnetic coremagnetic saturationmagneticsAir Gap Select a tag from the list or create your own.Drag to re-order taxonomy terms. License - None - What's this? Design Titleby 瀧澤登 × Embed Design Copy Embed Code <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/embed-design/180341"></iframe> Embed Live Design Copy Embed Code <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/node/180341"></iframe> Share a Link Copy URL https://explore.partquest.com/node/180341 Power Transformer with Losses Mike DonnellyDesigner19 × Mike Donnelly Member for 10 years 4 months 1,529 designs 10 groups Title Description <p>Under development</p><p>Note that the flux density "b" is displayed for the magnetic core. The core saturation flux density is specified as 1.5 Tesla, a typical value for Electrical Steel. You can also select "B vs. H from Table" to see the performance for a specific type of NGO Electrical Steel -35PN250 from the manufacturer Posco.</p> About text formats Tags in-rushtransformermagnetic saturationmagnetic corePosco 35PN250Electrical Steel Select a tag from the list or create your own.Drag to re-order taxonomy terms. License - None - What's this? Design Titleby Mike Donnelly × Embed Design Copy Embed Code <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/embed-design/25526"></iframe> Embed Live Design Copy Embed Code <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/node/25526"></iframe> Share a Link Copy URL https://explore.partquest.com/node/25526 Zoom test DGBDesigner12 × DGB Member for 10 years 4 months 116 designs 10 groups Title Description <p>This transformer design example demonstrates a current in-rush or "peaking" effect that depends on the phase or timing of the AC supply switch closure. A rather counter-intuitive result is shown;</p><p>Case 1: Set the initial_delay of the digital pulse to 4.17m seconds, which causes the switch to closed when the sinusoidal AC line input voltage is at its peak, one quarter-cycle at its 60 Hz frequency. The current into the primary winding will immediately follow its nominal steady-state no-load profile, with a peak of just under 100mA. </p><p>Case 2: Set the digital pulse initial_delay to 0 seconds, so that the line voltage is applied to the transformer immediately at its rising zero-crossing. This results in a large non-sinusoidal peaking current which exceeds 500mA on its initial cycle!</p><p>This is a direct result of saturation in the magnetic core. To produce the necessary "volt-seconds" in Case 2, the magnetic flux in the core must be twice that of Case 1. But if the transformer is sized such that its peak flux density is somewhat close to the the saturation level for nominal steady-state operation, then a start-up transient with the unfortunate timing of Case 2 will result in a large in-rush current.</p><p>Note that the flux density "b" is displayed for the magnetic core. The core saturation flux density is specified as 1.5 Tesla, a typical value for Electrical Steel. You can also select "B vs. H from Table" to see the performance for a specific type of NGO Electrical Steel -35PN250 from the manufacturer Posco.</p> About text formats Tags in-rushtransformermagnetic saturationmagnetic corePosco 35PN250Electrical Steel Select a tag from the list or create your own.Drag to re-order taxonomy terms. License - None - What's this? Design Titleby DGB × Embed Design Copy Embed Code <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/embed-design/25121"></iframe> Embed Live Design Copy Embed Code <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/node/25121"></iframe> Share a Link Copy URL https://explore.partquest.com/node/25121 Transformer Magnetizing In-rush Current Mike DonnellyDesigner19 × Mike Donnelly Member for 10 years 4 months 1,529 designs 10 groups Title Description <p>This transformer design example demonstrates a current in-rush or "peaking" effect that depends on the phase or timing of the AC supply switch closure. A rather counter-intuitive result is shown;</p><p>Case 1: Set the initial_delay of the digital pulse to 4.17m seconds, which causes the switch to closed when the sinusoidal AC line input voltage is at its peak, one quarter-cycle at its 60 Hz frequency. The current into the primary winding will immediately follow its nominal steady-state no-load profile, with a peak of just under 100mA. </p><p>Case 2: Set the digital pulse initial_delay to 0 seconds, so that the line voltage is applied to the transformer immediately at its rising zero-crossing. This results in a large non-sinusoidal peaking current which exceeds 500mA on its initial cycle!</p><p>This is a direct result of saturation in the magnetic core. To produce the necessary "volt-seconds" in Case 2, the magnetic flux in the core must be twice that of Case 1. But if the transformer is sized such that its peak flux density is somewhat close to the the saturation level for nominal steady-state operation, then a start-up transient with the unfortunate timing of Case 2 will result in a large in-rush current.</p><p>Note that the flux density "b" is displayed for the magnetic core. The core saturation flux density is specified as 1.5 Tesla, a typical value for Electrical Steel. You can also select "B vs. H from Table" to see the performance for a specific type of NGO Electrical Steel -35PN250 from the manufacturer Posco.</p> About text formats Tags in-rushtransformermagnetic saturationmagnetic corePosco 35PN250Electrical Steel Select a tag from the list or create your own.Drag to re-order taxonomy terms. License - None - What's this? Design Titleby Mike Donnelly × Embed Design Copy Embed Code <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/embed-design/16416"></iframe> Embed Live Design Copy Embed Code <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/node/16416"></iframe> Share a Link Copy URL https://explore.partquest.com/node/16416 Pagination Previous page ‹‹ Page 2
Inductor Model using Magnetic Circuit Modeling Method 瀧澤登Designer123146 × 瀧澤登 Member for 6 years 11 months 323 designs 3 groups Title Description <p>This example shows that you can build an inductor model from magnetic components (i.e. a winding and a core), and with an air-gap if needed. </p><p>You can run the nominal simulation with n = 23 turns on the winding, with the core model state set to "Linear" and a near-zero air-gap. The current transient in the winding matches the current in an ideal inductor model, both are representative of 1mH inductance. But in that configuration, the flux density "b" in the core is over 1.8 Tesla, well beyond the limits of a ferrite material.</p><p>You can set the magnetic core to "Non-linear with Saturation", and note that the saturation level is 525mT for the modeled core material. Then you can re-run the simulation to see the actual current profile that would result from this more realistic core behavior.</p><p>Finally, set the number of winding turns to 96. Then set the air-gap to 0.25mm, instead of the nominal 0.25um. This will restore the current rise profile that is expected for a 1mH inductor, but also keep the flux density in the core below the 525mT level.</p><p>It is also instructive to observe the energy stored in the ideal inductor, as well as the magnetic core and the air-gap, in each of the cases above.</p> About text formats Tags magnetic coremagnetic saturationmagneticsAir Gap Select a tag from the list or create your own.Drag to re-order taxonomy terms. License - None - What's this? Design Titleby 瀧澤登 × Embed Design Copy Embed Code <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/embed-design/180341"></iframe> Embed Live Design Copy Embed Code <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/node/180341"></iframe> Share a Link Copy URL https://explore.partquest.com/node/180341 Power Transformer with Losses Mike DonnellyDesigner19 × Mike Donnelly Member for 10 years 4 months 1,529 designs 10 groups Title Description <p>Under development</p><p>Note that the flux density "b" is displayed for the magnetic core. The core saturation flux density is specified as 1.5 Tesla, a typical value for Electrical Steel. You can also select "B vs. H from Table" to see the performance for a specific type of NGO Electrical Steel -35PN250 from the manufacturer Posco.</p> About text formats Tags in-rushtransformermagnetic saturationmagnetic corePosco 35PN250Electrical Steel Select a tag from the list or create your own.Drag to re-order taxonomy terms. License - None - What's this? Design Titleby Mike Donnelly × Embed Design Copy Embed Code <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/embed-design/25526"></iframe> Embed Live Design Copy Embed Code <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/node/25526"></iframe> Share a Link Copy URL https://explore.partquest.com/node/25526 Zoom test DGBDesigner12 × DGB Member for 10 years 4 months 116 designs 10 groups Title Description <p>This transformer design example demonstrates a current in-rush or "peaking" effect that depends on the phase or timing of the AC supply switch closure. A rather counter-intuitive result is shown;</p><p>Case 1: Set the initial_delay of the digital pulse to 4.17m seconds, which causes the switch to closed when the sinusoidal AC line input voltage is at its peak, one quarter-cycle at its 60 Hz frequency. The current into the primary winding will immediately follow its nominal steady-state no-load profile, with a peak of just under 100mA. </p><p>Case 2: Set the digital pulse initial_delay to 0 seconds, so that the line voltage is applied to the transformer immediately at its rising zero-crossing. This results in a large non-sinusoidal peaking current which exceeds 500mA on its initial cycle!</p><p>This is a direct result of saturation in the magnetic core. To produce the necessary "volt-seconds" in Case 2, the magnetic flux in the core must be twice that of Case 1. But if the transformer is sized such that its peak flux density is somewhat close to the the saturation level for nominal steady-state operation, then a start-up transient with the unfortunate timing of Case 2 will result in a large in-rush current.</p><p>Note that the flux density "b" is displayed for the magnetic core. The core saturation flux density is specified as 1.5 Tesla, a typical value for Electrical Steel. You can also select "B vs. H from Table" to see the performance for a specific type of NGO Electrical Steel -35PN250 from the manufacturer Posco.</p> About text formats Tags in-rushtransformermagnetic saturationmagnetic corePosco 35PN250Electrical Steel Select a tag from the list or create your own.Drag to re-order taxonomy terms. License - None - What's this? Design Titleby DGB × Embed Design Copy Embed Code <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/embed-design/25121"></iframe> Embed Live Design Copy Embed Code <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/node/25121"></iframe> Share a Link Copy URL https://explore.partquest.com/node/25121 Transformer Magnetizing In-rush Current Mike DonnellyDesigner19 × Mike Donnelly Member for 10 years 4 months 1,529 designs 10 groups Title Description <p>This transformer design example demonstrates a current in-rush or "peaking" effect that depends on the phase or timing of the AC supply switch closure. A rather counter-intuitive result is shown;</p><p>Case 1: Set the initial_delay of the digital pulse to 4.17m seconds, which causes the switch to closed when the sinusoidal AC line input voltage is at its peak, one quarter-cycle at its 60 Hz frequency. The current into the primary winding will immediately follow its nominal steady-state no-load profile, with a peak of just under 100mA. </p><p>Case 2: Set the digital pulse initial_delay to 0 seconds, so that the line voltage is applied to the transformer immediately at its rising zero-crossing. This results in a large non-sinusoidal peaking current which exceeds 500mA on its initial cycle!</p><p>This is a direct result of saturation in the magnetic core. To produce the necessary "volt-seconds" in Case 2, the magnetic flux in the core must be twice that of Case 1. But if the transformer is sized such that its peak flux density is somewhat close to the the saturation level for nominal steady-state operation, then a start-up transient with the unfortunate timing of Case 2 will result in a large in-rush current.</p><p>Note that the flux density "b" is displayed for the magnetic core. The core saturation flux density is specified as 1.5 Tesla, a typical value for Electrical Steel. You can also select "B vs. H from Table" to see the performance for a specific type of NGO Electrical Steel -35PN250 from the manufacturer Posco.</p> About text formats Tags in-rushtransformermagnetic saturationmagnetic corePosco 35PN250Electrical Steel Select a tag from the list or create your own.Drag to re-order taxonomy terms. License - None - What's this? Design Titleby Mike Donnelly × Embed Design Copy Embed Code <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/embed-design/16416"></iframe> Embed Live Design Copy Embed Code <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/node/16416"></iframe> Share a Link Copy URL https://explore.partquest.com/node/16416 Pagination Previous page ‹‹ Page 2
Power Transformer with Losses Mike DonnellyDesigner19 × Mike Donnelly Member for 10 years 4 months 1,529 designs 10 groups Title Description <p>Under development</p><p>Note that the flux density "b" is displayed for the magnetic core. The core saturation flux density is specified as 1.5 Tesla, a typical value for Electrical Steel. You can also select "B vs. H from Table" to see the performance for a specific type of NGO Electrical Steel -35PN250 from the manufacturer Posco.</p> About text formats Tags in-rushtransformermagnetic saturationmagnetic corePosco 35PN250Electrical Steel Select a tag from the list or create your own.Drag to re-order taxonomy terms. License - None - What's this? Design Titleby Mike Donnelly × Embed Design Copy Embed Code <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/embed-design/25526"></iframe> Embed Live Design Copy Embed Code <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/node/25526"></iframe> Share a Link Copy URL https://explore.partquest.com/node/25526 Zoom test DGBDesigner12 × DGB Member for 10 years 4 months 116 designs 10 groups Title Description <p>This transformer design example demonstrates a current in-rush or "peaking" effect that depends on the phase or timing of the AC supply switch closure. A rather counter-intuitive result is shown;</p><p>Case 1: Set the initial_delay of the digital pulse to 4.17m seconds, which causes the switch to closed when the sinusoidal AC line input voltage is at its peak, one quarter-cycle at its 60 Hz frequency. The current into the primary winding will immediately follow its nominal steady-state no-load profile, with a peak of just under 100mA. </p><p>Case 2: Set the digital pulse initial_delay to 0 seconds, so that the line voltage is applied to the transformer immediately at its rising zero-crossing. This results in a large non-sinusoidal peaking current which exceeds 500mA on its initial cycle!</p><p>This is a direct result of saturation in the magnetic core. To produce the necessary "volt-seconds" in Case 2, the magnetic flux in the core must be twice that of Case 1. But if the transformer is sized such that its peak flux density is somewhat close to the the saturation level for nominal steady-state operation, then a start-up transient with the unfortunate timing of Case 2 will result in a large in-rush current.</p><p>Note that the flux density "b" is displayed for the magnetic core. The core saturation flux density is specified as 1.5 Tesla, a typical value for Electrical Steel. You can also select "B vs. H from Table" to see the performance for a specific type of NGO Electrical Steel -35PN250 from the manufacturer Posco.</p> About text formats Tags in-rushtransformermagnetic saturationmagnetic corePosco 35PN250Electrical Steel Select a tag from the list or create your own.Drag to re-order taxonomy terms. License - None - What's this? Design Titleby DGB × Embed Design Copy Embed Code <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/embed-design/25121"></iframe> Embed Live Design Copy Embed Code <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/node/25121"></iframe> Share a Link Copy URL https://explore.partquest.com/node/25121 Transformer Magnetizing In-rush Current Mike DonnellyDesigner19 × Mike Donnelly Member for 10 years 4 months 1,529 designs 10 groups Title Description <p>This transformer design example demonstrates a current in-rush or "peaking" effect that depends on the phase or timing of the AC supply switch closure. A rather counter-intuitive result is shown;</p><p>Case 1: Set the initial_delay of the digital pulse to 4.17m seconds, which causes the switch to closed when the sinusoidal AC line input voltage is at its peak, one quarter-cycle at its 60 Hz frequency. The current into the primary winding will immediately follow its nominal steady-state no-load profile, with a peak of just under 100mA. </p><p>Case 2: Set the digital pulse initial_delay to 0 seconds, so that the line voltage is applied to the transformer immediately at its rising zero-crossing. This results in a large non-sinusoidal peaking current which exceeds 500mA on its initial cycle!</p><p>This is a direct result of saturation in the magnetic core. To produce the necessary "volt-seconds" in Case 2, the magnetic flux in the core must be twice that of Case 1. But if the transformer is sized such that its peak flux density is somewhat close to the the saturation level for nominal steady-state operation, then a start-up transient with the unfortunate timing of Case 2 will result in a large in-rush current.</p><p>Note that the flux density "b" is displayed for the magnetic core. The core saturation flux density is specified as 1.5 Tesla, a typical value for Electrical Steel. You can also select "B vs. H from Table" to see the performance for a specific type of NGO Electrical Steel -35PN250 from the manufacturer Posco.</p> About text formats Tags in-rushtransformermagnetic saturationmagnetic corePosco 35PN250Electrical Steel Select a tag from the list or create your own.Drag to re-order taxonomy terms. License - None - What's this? Design Titleby Mike Donnelly × Embed Design Copy Embed Code <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/embed-design/16416"></iframe> Embed Live Design Copy Embed Code <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/node/16416"></iframe> Share a Link Copy URL https://explore.partquest.com/node/16416 Pagination Previous page ‹‹ Page 2
Zoom test DGBDesigner12 × DGB Member for 10 years 4 months 116 designs 10 groups Title Description <p>This transformer design example demonstrates a current in-rush or "peaking" effect that depends on the phase or timing of the AC supply switch closure. A rather counter-intuitive result is shown;</p><p>Case 1: Set the initial_delay of the digital pulse to 4.17m seconds, which causes the switch to closed when the sinusoidal AC line input voltage is at its peak, one quarter-cycle at its 60 Hz frequency. The current into the primary winding will immediately follow its nominal steady-state no-load profile, with a peak of just under 100mA. </p><p>Case 2: Set the digital pulse initial_delay to 0 seconds, so that the line voltage is applied to the transformer immediately at its rising zero-crossing. This results in a large non-sinusoidal peaking current which exceeds 500mA on its initial cycle!</p><p>This is a direct result of saturation in the magnetic core. To produce the necessary "volt-seconds" in Case 2, the magnetic flux in the core must be twice that of Case 1. But if the transformer is sized such that its peak flux density is somewhat close to the the saturation level for nominal steady-state operation, then a start-up transient with the unfortunate timing of Case 2 will result in a large in-rush current.</p><p>Note that the flux density "b" is displayed for the magnetic core. The core saturation flux density is specified as 1.5 Tesla, a typical value for Electrical Steel. You can also select "B vs. H from Table" to see the performance for a specific type of NGO Electrical Steel -35PN250 from the manufacturer Posco.</p> About text formats Tags in-rushtransformermagnetic saturationmagnetic corePosco 35PN250Electrical Steel Select a tag from the list or create your own.Drag to re-order taxonomy terms. License - None - What's this? Design Titleby DGB × Embed Design Copy Embed Code <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/embed-design/25121"></iframe> Embed Live Design Copy Embed Code <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/node/25121"></iframe> Share a Link Copy URL https://explore.partquest.com/node/25121 Transformer Magnetizing In-rush Current Mike DonnellyDesigner19 × Mike Donnelly Member for 10 years 4 months 1,529 designs 10 groups Title Description <p>This transformer design example demonstrates a current in-rush or "peaking" effect that depends on the phase or timing of the AC supply switch closure. A rather counter-intuitive result is shown;</p><p>Case 1: Set the initial_delay of the digital pulse to 4.17m seconds, which causes the switch to closed when the sinusoidal AC line input voltage is at its peak, one quarter-cycle at its 60 Hz frequency. The current into the primary winding will immediately follow its nominal steady-state no-load profile, with a peak of just under 100mA. </p><p>Case 2: Set the digital pulse initial_delay to 0 seconds, so that the line voltage is applied to the transformer immediately at its rising zero-crossing. This results in a large non-sinusoidal peaking current which exceeds 500mA on its initial cycle!</p><p>This is a direct result of saturation in the magnetic core. To produce the necessary "volt-seconds" in Case 2, the magnetic flux in the core must be twice that of Case 1. But if the transformer is sized such that its peak flux density is somewhat close to the the saturation level for nominal steady-state operation, then a start-up transient with the unfortunate timing of Case 2 will result in a large in-rush current.</p><p>Note that the flux density "b" is displayed for the magnetic core. The core saturation flux density is specified as 1.5 Tesla, a typical value for Electrical Steel. You can also select "B vs. H from Table" to see the performance for a specific type of NGO Electrical Steel -35PN250 from the manufacturer Posco.</p> About text formats Tags in-rushtransformermagnetic saturationmagnetic corePosco 35PN250Electrical Steel Select a tag from the list or create your own.Drag to re-order taxonomy terms. License - None - What's this? Design Titleby Mike Donnelly × Embed Design Copy Embed Code <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/embed-design/16416"></iframe> Embed Live Design Copy Embed Code <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/node/16416"></iframe> Share a Link Copy URL https://explore.partquest.com/node/16416 Pagination Previous page ‹‹ Page 2
Transformer Magnetizing In-rush Current Mike DonnellyDesigner19 × Mike Donnelly Member for 10 years 4 months 1,529 designs 10 groups Title Description <p>This transformer design example demonstrates a current in-rush or "peaking" effect that depends on the phase or timing of the AC supply switch closure. A rather counter-intuitive result is shown;</p><p>Case 1: Set the initial_delay of the digital pulse to 4.17m seconds, which causes the switch to closed when the sinusoidal AC line input voltage is at its peak, one quarter-cycle at its 60 Hz frequency. The current into the primary winding will immediately follow its nominal steady-state no-load profile, with a peak of just under 100mA. </p><p>Case 2: Set the digital pulse initial_delay to 0 seconds, so that the line voltage is applied to the transformer immediately at its rising zero-crossing. This results in a large non-sinusoidal peaking current which exceeds 500mA on its initial cycle!</p><p>This is a direct result of saturation in the magnetic core. To produce the necessary "volt-seconds" in Case 2, the magnetic flux in the core must be twice that of Case 1. But if the transformer is sized such that its peak flux density is somewhat close to the the saturation level for nominal steady-state operation, then a start-up transient with the unfortunate timing of Case 2 will result in a large in-rush current.</p><p>Note that the flux density "b" is displayed for the magnetic core. The core saturation flux density is specified as 1.5 Tesla, a typical value for Electrical Steel. You can also select "B vs. H from Table" to see the performance for a specific type of NGO Electrical Steel -35PN250 from the manufacturer Posco.</p> About text formats Tags in-rushtransformermagnetic saturationmagnetic corePosco 35PN250Electrical Steel Select a tag from the list or create your own.Drag to re-order taxonomy terms. License - None - What's this? Design Titleby Mike Donnelly × Embed Design Copy Embed Code <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/embed-design/16416"></iframe> Embed Live Design Copy Embed Code <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/node/16416"></iframe> Share a Link Copy URL https://explore.partquest.com/node/16416 Pagination Previous page ‹‹ Page 2