Beckhoff SCT6 Series Manuel utilisateur
Documentation | EN
SCT6xxx
Split-core current transformers
2022-11-10 | Version: 1.3
Table of contents
SCT6xxx 3Version: 1.3
Table of contents
1 Foreword....................................................................................................................................................5
1.1 Notes on the documentation .............................................................................................................5
1.2 Safety instructions.............................................................................................................................6
2 Product overview ......................................................................................................................................8
2.1 Introduction .......................................................................................................................................8
2.2 Basics current transformers ..............................................................................................................9
2.3 Product categories – SCTxxxx current transformer ........................................................................14
2.4 Notes on class accuracy SCT transformers....................................................................................23
3 Technical data .........................................................................................................................................24
3.1 SCT61xx | Split-core current transformers, size 1........................................................................... 24
3.1.1 SCT61xx | General...........................................................................................................24
3.1.2 SCT6101 | Split-core current transformer for primary currents 0…60 A AC to 0…150 A
AC, accuracy class 3, size 1 ............................................................................................26
3.2 SCT63xx | Split-core current transformers, size 3........................................................................... 27
3.2.1 SCT63xx | General...........................................................................................................27
3.2.2 SCT6311 | Split-core current transformer for primary currents 0…200 A AC / 0…250 A
AC, accuracy class 1, size 3 ............................................................................................29
3.2.3 SCT6321 | Split-core current transformer for primary currents 0…200 A AC / 0…250 A
AC, accuracy class 0.5, size 3 .........................................................................................30
3.3 SCT64xx | Split-core current transformers, size 4........................................................................... 31
3.3.1 SCT64xx | General...........................................................................................................31
3.3.2 SCT6411 | Split-core current transformer for primary currents 0…300 A AC to 0...500 A
AC, accuracy class 1, size 4 ............................................................................................33
3.3.3 SCT6421 | Split-core current transformer for primary currents 0…400 A AC / 0…500 A
AC, accuracy class 0.5, size 4 .........................................................................................34
3.4 SCT66xx | Split-core current transformers, size 6........................................................................... 35
3.4.1 SCT66xx | General...........................................................................................................35
3.4.2 SCT6615 | Split-core current transformer for primary currents 0…600 A AC / 0…750 A
AC, accuracy class 1, size 6 ............................................................................................37
3.4.3 SCT6625 | Split-core current transformer for primary currents 0…600 A AC / 0…750 A
AC, accuracy class 0.5, size 6 .........................................................................................38
3.5 SCT67xx | Split-core current transformers, size 7........................................................................... 39
3.5.1 SCT67xx | General...........................................................................................................39
3.5.2 SCT6715 | Split-core current transformer for primary currents 0…800 A AC / 0…1000 A
AC, accuracy class 1, size 7 ............................................................................................41
3.5.3 SCT6725 | Split-core current transformer for primary currents 0…800 A AC / 0…1000 A
AC, accuracy class 0.5, size 7 .........................................................................................42
4 Commissioning .......................................................................................................................................43
4.1 Installation .......................................................................................................................................43
4.2 Maintenance and inspection ...........................................................................................................46
4.3 Troubleshooting ..............................................................................................................................47
5 Application example ...............................................................................................................................48
5.1 Power measurement at a machine .................................................................................................48
6 Appendix..................................................................................................................................................50
6.1 Documentation issue status ............................................................................................................50
Foreword
SCT6xxx 5Version: 1.3
1 Foreword
1.1 Notes on the documentation
Copyright
© Beckhoff Automation GmbH & Co. KG, Germany.
The reproduction, distribution and utilization of this document as well as the communication of its contents to
others without express authorization are prohibited.
Offenders will be held liable for the payment of damages. All rights reserved in the event of the grant of a
patent, utility model or design.
Disclaimer
The documentation has been prepared with care. The products described are, however, constantly under
development.
We reserve the right to revise and change the documentation at any time and without prior announcement.
No claims for the modification of products that have already been supplied may be made on the basis of the
data, diagrams and descriptions in this documentation.
EtherCAT® is registered trademark and patented technology, licensed by Beckhoff Automation GmbH,
Germany.
Trademarks
Beckhoff®, TwinCAT®, TwinCAT/BSD®, TC/BSD®, EtherCAT®, EtherCATG®, EtherCATG10®, EtherCATP®,
SafetyoverEtherCAT®, TwinSAFE®, XFC®, 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
The EtherCAT Technology is covered, including but not limited to the following patent applications and
patents: EP1590927, EP1789857, EP1456722, EP2137893, DE102015105702 with corresponding
applications or registrations in various other countries.
Intended audience
This description is only intended for the use of trained specialists in control and automation engineering who
are familiar with the applicable national standards.
It is essential that the documentation and the following notes and explanations are followed when installing
and commissioning these components.
It is the duty of the technical personnel to use the documentation published at the respective time of each
installation and commissioning.
The responsible staff must ensure that the application or use of the products described satisfy all the
requirements for safety, including all the relevant laws, regulations, guidelines and standards.
Foreword
SCT6xxx6 Version: 1.3
1.2 Safety instructions
Description of instructions
In this documentation the following instructions are used.
These instructions must be read carefully and followed without fail!
DANGER
Serious risk of injury!
Failure to follow this safety instruction directly endangers the life and health of persons.
WARNING
Risk of injury!
Failure to follow this safety instruction endangers the life and health of persons.
CAUTION
Personal injuries!
Failure to follow this safety instruction can lead to injuries to persons.
NOTE
Damage to environment/equipment or data loss
Failure to follow this instruction can lead to environmental damage, equipment damage or data loss.
Tip or pointer
This symbol indicates information that contributes to better understanding.
Exclusion of liability
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.
Intended use
If the equipment is used in a manner not specified by the manufacturer, the protection provided by the
equipment may be impaired
Safety regulations
Please note the following safety instructions and explanations!
Product-specific safety instructions can be found on following pages or in the areas mounting, wiring,
commissioning etc.
Current transformer safety instructions
The following points must be noted:
• The applicable laws, standards and regulations.
• The state of the art at the time of installation.
• The technical rules.
Foreword
SCT6xxx 7Version: 1.3
• The operating instructions.
• The fact that operating instructions can only list general regulations and that these regulations must be
followed.
• Check the device carefully for transport damage prior to commissioning. The device must not be put
into operation if it is mechanically damaged.
• The devices described are intended for installation by qualified electricians and may only be installed in
electrical plant rooms or in closed housings. Any other use or the disregard of these application notes
will result in the loss of the warranty/guarantee.
• 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.
Product overview
SCT6xxx8 Version: 1.3
2 Product overview
2.1 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.
The SCT series portfolio is extremely diversified, ranging from the low-cost 3-phase transformer sets for
properties and standard industrial transformers for mechanical engineering, through to solutions for test
benches with particularly high requirements for accuracy.
The choice of the right product category [}14] depends on the type of usage:
Whilst the data acquisition can be implemented cost-efficiently and with high measurement accuracy using
the ring-type current transformers, particularly in new systems, the split-core current transformers are
suitable as an uncomplicated retrofit solution due to the simplicity of their attachment.
The SCT5xxx transformers occupy a special position. These are not intended for energy measurement, but
are specially designed for highly accurate detection of differential currents. In addition, unlike the other SCT
transformers, they are also suitable for DC currents and thus meet the differential current detection
according to the Type B definition. Therefore, AC as well as DC currents up to 100 kHz can be measured by
a fluxgate measuring principle.
Product overview
SCT6xxx 9Version: 1.3
2.2 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.
Function and design
A current transformer is a transforming device that transforms an input current into a processable current
signal at the output. A current transformer is mainly used to transform currents of large magnitudes to directly
measurable, smaller values in the milliampere or small ampere range. With a classic current transformer, the
input current is proportional to the output current. Due to the physical principle and the mechanical
construction, the current signal is transmitted galvanically isolated to the evaluation electronics.
A current transformer basically consists of a small number of windings on the primary side and a larger
number of windings on the secondary side. The current to be converted flows through the primary side. The
windings are usually wound on an alternating magnetic ferrite ring core.
A typical transformer type is the ring core or ring-type current transformer. The current rail or current-carrying
cable is often used as the primary winding, which is guided through the toroidal core of the transformer.
Thus, the rail or line forms the primary winding with one turn. The secondary winding is located on the ring
core. The transformation is determined by the ratio of the number of primary and secondary windings. The
classic structure of a ring-type current transformer is shown in the following figure.
Fig.2: Principle ring-type current transformer
Another classic type is the coiled current transformer. In this type of transformer, the primary winding is a
current-carrying wire which is wound around the ring core on the primary side. In this case, the primary
winding number is >1, but smaller than the secondary winding number. The principle is shown in the
following figure
Product overview
SCT6xxx10 Version: 1.3
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 elec-
tronics in the secondary circuit, the current transformer must therefore be short-circuited at its secondary
terminals.
Grounding of secondary terminals
According to DIN VDE 0141 (01/2000) paragraph 5.3.4, current and voltage transformers for nomi-
nal voltages from Um=3.6kV must be grounded on the secondary side. For low voltages
(Um≤1.2kV), grounding is not required if the transformer housings do not have any metal surfaces
with large contact areas.
Characteristic values and calculation
In principle, the construction, and thus also the calculation, correspond to a normal transformer. The basic
relationship between input and output current is determined by the ratio of the number of turns N of the
primary and secondary sides. An important characteristic value in the design of a current transformer is
therefore the transformer ratio.
IOut = N1/N2 * IIn
Ce manuel convient aux modèles suivants
15
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