Related Manuals for Beckhoff SCT3 Series
Summary of Contents for Beckhoff SCT3 Series
- Page 1 Documentation | EN SCT3xxx 3-phase ring-type current transformers 2023-01-03 | Version: 1.4...
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Page 3: Table Of Contents
Table of contents Table of contents 1 Foreword .............................. 5 Notes on the documentation ...................... 5 Safety instructions .......................... 5 2 Product overview ............................ 8 Introduction ............................ 8 Basics current transformers ...................... 9 Product categories – SCTxxxx current transformer ................ 14 Notes on class accuracy SCT transformers .................. - Page 4 Table of contents Version: 1.4 SCT3xxx...
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Page 5: Foreword
, XTS and XPlanar are registered trademarks of and licensed by Beckhoff Automation GmbH. Other designations used in this publication may be trademarks whose use by third parties for their own purposes could violate the rights of the owners. Patent Pending... - Page 6 All the components are supplied in particular hardware and software configurations appropriate for the application. Modifications to hardware or software configurations other than those described in the documentation are not permitted, and nullify the liability of Beckhoff Automation GmbH & Co. KG. Personnel qualification This description is only intended for trained specialists in control, automation and drive engineering who are familiar with the applicable national standards.
- Page 7 Foreword • The devices may only be installed in dry indoor rooms. • Do not mount on highly flammable materials. • Operation with a higher current than the rated current specified on the name plate can lead to overheating of the current transformer and thus to burns. SCT3xxx Version: 1.4...
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Page 8: Product Overview
Product overview Product overview Introduction SCTxxxx | Current transformers for power measurement Fig. 1: SCT current transformers The SCT current transformers allow reliable power sensor technology to be implemented directly in the field as an integral part of the PC-based control system. Users can choose between two concepts, which are highly scalable thanks to various designs and performance classes and are thus suitable for any application. -
Page 9: Basics Current Transformers
Product overview Basics current transformers Basic information on the technology area of current transformers is given in the following. The information is of general nature; so it is imperative to check the extent to which these notes apply to your specific application. - Page 10 Product overview Fig. 3: Principle coil current transformer WARNING Dangerous voltages with secondary side not connected The secondary winding must be connected to a current measuring device or short-circuited, otherwise high core losses or dangerous voltages may occur on the secondary side. Before replacing the measuring electronics in the secondary circuit, the current transformer must therefore be short-circuited at its secondary terminals.
- Page 11 Product overview Technical terms of current transformers Term Explanation Primary rated current I (alternative Value of the rated current on the primary side symbol I Secondary rated current I Value of the rated current on the secondary side. Rated power S Value of apparent power (in [VA]) that the transformer can deliver to the secondary circuit at secondary rated current and rated load Rated frequency f...
- Page 12 Product overview Principle of the fluxgate current measurement technology While all SCT transformers except the SCT5xxx are based on the transformer principle described above, the technology of the all-current sensitive differential current transformers is fundamentally different. Fig. 4: Principle fluxgate current measurement technology The measuring principle of the SCT5xxx is based on a differential current measurement of two oppositely excited cores in the transducer.
- Page 13 Product overview Fig. 5: Characteristics fluxgate current measurement technology The detection winding now measures the induced current of the excitation winding (blue). If the measuring current I is 0, then 0 A is also measured, since no compensating current is generated for compensation. prim If the measuring current I is not equal to 0, a compensating current is generated through both cores, which...
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Page 14: Product Categories - Sctxxxx Current Transformer
Product overview Product categories – SCTxxxx current transformer Breakdown of the type designation of the SCT current transformer Fig. 6: Designation key of the SCT current transformers Version: 1.4 SCT3xxx... - Page 15 Product overview Coil current transformers Fig. 7: SCT0xxx In order to guarantee the power transmission, current transformers need a correspondingly large measuring core volume with decreasing primary nominal currents. The dimensions of standard current transformers would quickly hit their limits on the basis of this physical principle. The SCT0xxx coil current transformers with electrical isolation are specially designed for these low primary nominal currents and are used in corresponding applications.
- Page 16 Product overview Mini ring-type current transformer Fig. 8: SCT1xxx The SCT1111 mini ring-type current transformer can be positioned on a DIN rail by means of snap-on mounting and is thus suitable for measurements in very tight installation spaces, e.g. directly in the sub- distribution unit.
- Page 17 Product overview Ring-type current transformer Fig. 9: SCT2xxx The SCT2xxx series offers a large selection of ring-type current transformers for primary currents from 60 to 2500 A in six sizes and two accuracy classes. The innovative screwless connection technology for rigid and flexible conductors saves time –...
- Page 18 Product overview Ring-type current transformer Accuracy class 1, SCT2111 Primary current 0...60 A AC to 0...500 A AC, Secondary current 1 A AC, Max. diameter round conductor 25.7 mm (size 1) Accuracy class 0.5, SCT2121 Primary current 0...125 A AC to 0...600 A AC, Secondary current 1 A AC, Max. diameter round conductor 25.7 mm (size 1) Accuracy class 1, SCT2211 Primary current 0...600 A AC / 750 A AC,...
- Page 19 Product overview 3-phase ring-type current transformers Fig. 10: SCT3xxx The compact SCT3xxx 3-phase ring-type current transformers for direct mounting below commonly used power switches measure primary currents from 3 x 50 to 3 x 600 A, with secondary currents of 1 or 5 A. The SCT3xxx series is available throughout in accuracy class 1 and is supplemented by the SCT3121-0125 and SCT3121-0150 current transformers in accuracy class 0.5.
- Page 20 Product overview Ring-type current transformer for differential current measurement Fig. 11: SCT5xxx The increasing prevalence of DC loads (e.g., LED lighting, DC motor drives, 48 V DC bus systems, etc.), distributed DC generation (e.g., PV systems, UPS, batteries, etc.), and high-frequency converters (e.g., SMPS, motor drives, etc.) in industrial environments makes it increasingly difficult to reliably measure insulation faults with conventional current transformers designed for AC 50/60 Hz with limited measurement bandwidth.
- Page 21 Product overview Split-core current transformers Fig. 12: SCT6xxx The separable measuring system of the SCT6xxx split-core current transformers enables flexible retrofitting without disconnecting the primary conductor. Due to the minimal installation effort, they are suitable for use in places that are difficult to access or where space is limited. Four sizes are available. Accuracy class 3 is suitable for primary currents from 60 to 150 A, accuracy class 1 for 200 to 1000 A.
- Page 22 Product overview Busbar split-core current transformers Fig. 13: SCT71xx Like the SCT6xxx series, the SCT7xxx busbar split-core current transformers for primary currents up to 5000 A can be retrofitted to existing systems with no great mounting effort. From 500 A, there is a choice between accuracy class 0.5 and 1 for each primary current.
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Page 23: Notes On Class Accuracy Sct Transformers
Product overview Notes on class accuracy SCT transformers Current transformers are divided into classes according to their accuracy. The Beckhoff SCT current transformers are available in the standard accuracy classes 0.5; 1 and 3, depending on the product category. The class designation corresponds to an error curve with regard to current amplitude and angular error. -
Page 24: Technical Data
Technical data Technical data SCT31xx | 3-phase ring-type current transformers, size 1 3.1.1 SCT31xx | General Primary side SCT31xx-xxxx Thermal rated continuous current I 1,0 * I Rated short-time thermal current I 60 * I /1 s (max. 100 kA) Rated impulse current I 2,5 * I Rated frequency f... - Page 25 Technical data SCT31xx dimensions, size 1 Fig. 15: Isometric view, top view; all dimensions in mm Fig. 16: Right side view, front view, left side view; all dimensions in mm SCT3xxx Version: 1.4...
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Page 26: Sct3111 | 3-Phase Ring-Type Current Transformer For Primary Currents 3 X 0
Technical data 3.1.2 SCT3111 | 3-phase ring-type current transformer for primary currents 3 x 0...50 A AC to 3 x 0..150 A AC, accuracy class 1, size 1 Technical data SCT3111-xxxx Accuracy class Primary current I 3 x 50…3 x 150 A Secondary current I Versions SCT3111-0050... -
Page 27: Sct3121 | 3-Phase Ring-Type Current Transformer For Primary Currents 3 X 0
Technical data 3.1.3 SCT3121 | 3-phase ring-type current transformer for primary currents 3 x 0...125 A AC / 3 x 0...150 A AC, accuracy class 0.5, size 1 Technical data SCT3121-xxxx Accuracy class Primary current I 3 x 125 / 3 x 150 A Secondary current I Versions SCT3121-0125... -
Page 28: Sct32Xx | 3-Phase Ring-Type Current Transformers, Size 2
Technical data SCT32xx | 3-phase ring-type current transformers, size 2 3.2.1 SCT32xx | General Primary side SCT32xx-xxxx Thermal rated continuous current I 1,0 * I Rated short-time thermal current I 60 * I /1 s (max. 100 kA) Rated impulse current I 2,5 * I Rated frequency f 50..60 Hz... - Page 29 Technical data SCT32xx dimensions, size 2 Fig. 17: Isometric view, top view; all dimensions in mm Fig. 18: Right side view, front view, left side view; all dimensions in mm SCT3xxx Version: 1.4...
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Page 30: Sct3215 | 3-Phase Ring-Type Current Transformer For Primary Currents 3 X 0
Technical data 3.2.2 SCT3215 | 3-phase ring-type current transformer for primary currents 3 x 0...100 A AC to 3 x 0...250 A AC, accuracy class 1, size 2 Technical data SCT3215-xxxx Accuracy class Primary current I 3 x 0…100 A AC to 3 x 0…250 A AC Secondary current I 5 A AC Versions... -
Page 31: Sct33Xx | 3-Phase Ring-Type Current Transformers, Size 3
Technical data SCT33xx | 3-phase ring-type current transformers, size 3 3.3.1 SCT33xx | General Primary side SCT33xx-xxxx Thermal rated continuous current I 1,0 * I Rated short-time thermal current I 60 * I /1 s (max. 100 kA) Rated impulse current I 2,5 * I Rated frequency f 50..60 Hz... - Page 32 Technical data SCT33xx dimensions, size 3 Fig. 19: Isometric view, top view; all dimensions in mm Fig. 20: Right side view, front view, left side view; all dimensions in mm Version: 1.4 SCT3xxx...
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Page 33: Sct3315 | 3-Phase Ring-Type Current Transformer For Primary Currents 3 X 0
Technical data 3.3.2 SCT3315 | 3-phase ring-type current transformer for primary currents 3 x 0...250 A AC to 3 x 0...600 A AC, accuracy class 1, size 3 Technical data SCT3315-xxxx Accuracy class Primary current I 3 x 0…250 A AC to 3 x 0…600 A AC Secondary current I 5 A AC Versions... -
Page 34: Commissioning
Commissioning Commissioning DANGER Open transformer circuits lead to electric shock and arc flashover! Disregarding this will result in death, physical injury or considerable damage to property! • Never open the secondary circuit of the current transformer under load. • Short-circuit the secondary current terminals of the current transformer before removing the device. WARNING Hazardous voltage can lead to electric shock and burns! •... - Page 35 Commissioning Measuring circuit Fig. 21: Measuring circuit - SCT3xxx transformer Fig. 22: SCT3xxx transformer, meter circuit, multi-phase SCT3xxx Version: 1.4...
- Page 36 Commissioning Assembly notes Fig. 23: Mounting the fastening screws SCT3215, SCT3315 Fig. 24: Mounting on copper bar or round conductor, SCT3215, SCT3315 Fig. 25: Tightening torque of fastening screw: 0.5 Nm Version: 1.4 SCT3xxx...
- Page 37 Commissioning Fig. 26: Mounting on mounting plate SCT3211 Fig. 27: Mounting on mounting plate SCT3315 SCT3xxx Version: 1.4...
- Page 38 Commissioning Fig. 28: Connection example Version: 1.4 SCT3xxx...
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Page 39: Application Example
EL3443 • The voltage is measured via connections L1, L2, L3 and N. • The current is measured via three current transformers (e.g. from the Beckhoff SCT series) and the connections I and I (star point of the current transformers). - Page 40 EL3453 • The voltage is measured via connections L1, L2, L3 and N. • The current is measured via 4 current transformers (e.g. from the Beckhoff SCT series) and the connections I and I (star point of the current transformers).
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Page 41: Appendix
Appendix Appendix Documentation issue status Version Comment - Chapter ”Technical data” updated - Chapter ”Introduction” updated - Chapter ”Technical data” updated - Addenda chapter ”Notes on class accuracy SCT transformers” - Addenda & corrections public issue - Addenda & corrections SCT3xxx Version: 1.4... -
Page 42: Ul Notes
Appendix UL notes "Conditions of Acceptability" for SCT3xxx Conditions of Acceptability • These devices shall be installed within equipment that will provide an acceptable enclosure. • The acceptability of the mounting means for these transformers shall be determined in the end- use application. -
Page 43: Support And Service
Please contact your Beckhoff branch office or representative for local support and service on Beckhoff products! The addresses of Beckhoff's branch offices and representatives round the world can be found on her internet pages: www.beckhoff.com You will also find further documentation for Beckhoff components there. - Page 45 More Information: www.beckhoff.com/SCT3xxx Beckhoff Automation GmbH & Co. KG Hülshorstweg 20 33415 Verl Germany Phone: +49 5246 9630 info@beckhoff.com www.beckhoff.com...