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Documentation | EN

SCT5xxx

Ring-type current transformer for differential current 0...2 A, type B/B+ (all-

current sensitive), ISO62020-1 conform

2022-09-29 | Version: 1.0

Summary of Contents for SCT Series

Page 1: ...Documentation EN SCT5xxx Ring type current transformer for differential current 0 2 A type B B all current sensitive ISO62020 1 conform 2022 09 29 Version 1 0...

Page 2: ......

Page 3: ...r 14 3 Technical data 23 3 1 SCT5xxx Ring type current transformer for differential current size 5 23 3 1 1 SCT5564 23 4 Commissioning 26 4 1 Mounting instructions mounting options 27 4 2 Measurement...

Page 4: ...Table of contents SCT5xxx 4 Version 1 0...

Page 5: ...rCAT P Safety over EtherCAT 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 b...

Page 6: ...he 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 doc...

Page 7: ...ged 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 appl...

Page 8: ...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...

Page 9: ...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...

Page 10: ...s According to DIN VDE 0141 01 2000 paragraph 5 3 4 current and voltage transformers for nomi nal voltages from Um 3 6 kV must be grounded on the secondary side For low voltages Um 1 2 kV grounding is...

Page 11: ...of the continuous current in the primary winding at which the overtemperature does not exceed the value specified in the standard with the secondary winding loaded with the rated load Rated short time...

Page 12: ...nsformers 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 exc...

Page 13: ...ents at frequencies up to 100 kHz This makes this differential current transformer compatible with a wide range of industrial applications loads and power sources With its user selectable settings thi...

Page 14: ...ct overview SCT5xxx 14 Version 1 0 2 3 Product categories SCTxxxx current transformer Breakdown of the type designation of the SCT current transformer Fig 6 Designation key of the SCT current transfor...

Page 15: ...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...

Page 16: ...stallation spaces e g directly in the sub distribution unit Two current transformers are attached to the DIN rail while the third current transformer is plugged into the fastened current transformers...

Page 17: ...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 technolo...

Page 18: ...onductor 43 7 mm size 3 SCT2321 Accuracy class 0 5 Primary current 0 800 A AC 1000 A AC Secondary current 1 A AC Max diameter round conductor 43 7 mm size 3 SCT2411 Accuracy class 1 Primary current 0...

Page 19: ...rmers in accuracy class 0 5 3 phase ring type current transformers SCT3111 Accuracy class 1 Primary current 3 x 0 50 A AC to 3 x 0 150 A AC Secondary current 1 A AC Max diameter round conductor 13 5 m...

Page 20: ...ere Monitoring residual currents with the SCT5xxx in real time in a power system opens up the possibility of evaluating the condition of the electrical insulation based on the actual measured value so...

Page 21: ...conductor 18 5 mm size 3 SCT6321 Accuracy class 0 5 Primary current 0 200 A AC 0 250 A AC Secondary current 1 A AC Max diameter round conductor 18 5 mm size 3 SCT6411 Accuracy class 1 Primary current...

Page 22: ...ize 1 SCT7125 Accuracy class 0 5 Primary current 0 400 A AC Secondary current 5 A AC Max diameter round conductor 20 mm size 1 SCT7215 Accuracy class 1 Primary current 0 500 A AC 0 600 A AC Secondary...

Page 23: ...0 4 A RMS for I n 30 300 mA 2 A RMS for I n 0 5 1 A Resolution 0 01 mA Update interval 1 ms 1 kHz Measurement uncertainty 2 typ 5 max for 10 400 Hz 3 typ 7 max for DC 10 kHz relative to full scale val...

Page 24: ...ion Protection rating IP20 Connection secondary DFMC 1 5 3 5 2x5way PN 1790519 or compatible Conductor cross section secondary 0 2 1 5 mm 16 24 AWG Strip length 10 mm Size 5 Dimensions W x H x D 151 3...

Page 25: ...Technical data SCT5xxx 25 Version 1 0 Fig 15 Side view front view all dimensions in mm...

Page 26: ...ectric shock and burns Make sure that the details on the name plate and in the Technical data correspond to the operating pa rameters of the system Switch the system off before commencing with the ins...

Page 27: ...d in the scope of delivery for this Fig 16 Mounting SCT5xxx Fastening the base plate with screws in the four holes Free suspension on the cable with the help of cable ties through the hooks on the bac...

Page 28: ...Commissioning SCT5xxx 28 Version 1 0 Fig 18 Center conductors...

Page 29: ...Commissioning SCT5xxx 29 Version 1 0 4 2 Measurement circuit example SCT5xxx Fig 19 Use in single phase as well as 3 and 4 pin three phase systems...

Page 30: ...3 Connection Fig 20 Connection Connection point Description 1 24 Vdc 2 Relay ground 3 0 Vdc 4 Relay NC contact 5 0 Vdc 6 Relay NO contact 7 0 Vdc 8 External test button contact 1 9 Analog 4 20 mA out...

Page 31: ...RC limit details in the electrical specifications tables After these intermediate steps the TRMS value of the differential current is ready to be output to the analog 4 20mA output However the behavio...

Page 32: ...Commissioning SCT5xxx 32 Version 1 0 Fig 21 SCT5xxx block diagram...

Page 33: ...lso suggests a suitable frequency range and integration time Required steps Activate the auto setting by pressing the Rated RC limit and Integration time buttons simultaneously for more than 3 seconds...

Page 34: ...olor changes to red with heartbeat characteristic the measured TRMS residual current is higher than the rated RC limit The LED flashes green during start up Continuous red light in combination with se...

Page 35: ...current levels the user can tolerate in the electrical power system before system testing or maintenance is required 5 Frequency range FR Refers to the measurement bandwidth for the differential curr...

Page 36: ...explains the standard Where a circuit is permanently monitored by an RCM in accordance with IEC 62020 it is not necessary to measure the insulation resistance if the function of the RCM is correct IE...

Page 37: ...perfect insulation and cannot be technically separated Also due to inductances e g motor high current peaks can be generated during the switch on processes which can lead to relay tripping at the RCD...

Page 38: ...Appendix SCT5xxx 38 Version 1 0 6 Appendix 6 1 Documentation issue status Version Comment 1 0 First public issue 0 2 Corrections complements 0 1 Preliminary version...

Page 39: ...here Beckhoff Support Support offers you comprehensive technical assistance helping you not only with the application of individual Beckhoff products but also with other wide ranging services support...

Page 40: ......

Page 41: ...Beckhoff Automation GmbH Co KG H lshorstweg 20 33415 Verl Germany Phone 49 5246 9630 info beckhoff com www beckhoff com More Information www beckhoff com SCT5xxx...

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