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UniGear DigitalContents
1. Digital switchgear
2. Complexity of Distribution networks
3. New technologies using digital sensors
4. Typical customer problems with MV Switchgear
5. Challenges using Conventional CT’s & VT’s
6. Benefits using Digital sensors CT’s & VT’s
7. ABB Solution
8. ABB References
9. Conclusion
3/5/2018 Slide 2
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Digital medium-voltage switchgear
Definition
As a part of the ABB Ability™ portfolio of connected solutions, digital switchgear enables smart electrical networks that deliver power reliably and efficiently
Digital switchgear combines the latest digital technologies within ABB’s well-known and established medium-voltage switchgear and brings increased flexibility, reliability and safety, and additionally reduces switchgear weight, footprint and delivery time.
ABB’s digital switchgear solutions integrate innovative protection, control and sensing devices, where all measures, statuses and commands are reliably transferred on a real-time Ethernet communication bus over the IEC 61850 protocol.
Digital switchgear enables pro-active management of the medium-voltage equipment throughout their entire life cycle. It enables easy integration to increase smart functionality, such as power management, real-time diagnostics and remote monitoring
3/5/2018 Slide 3
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Demand on MV switchgear increases
Distribution networks are getting more complex
3/5/2018 Slide 4
Be “smart”!
Be easy!
Be flexible!
▪Be safe!
Be simple!
Be environmental friendly!Be future proof!
Be on time!Be reliable!
Be efficient!
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Addresses 3 main areas of benefits
UniGear Digital
March 5, 2018 Slide 5
UniGear Digital = less worries in your electrical network
Future-proof solutionIncreases substation availability Lowers overall costs
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UniGear Digital Typical customer problems during tendering phase
– Dependency on instrument transformer manufacturer’s offer
– Specifically specified components (e.g. relays)
– Detailed panel designs and drawings not always available
– Customer needs to provide a lot of data to enable manufacturers to
check CT and VT parameters, but the equipment specifications
(motors, transformers etc) is often not yet known or require
complicated network studies
– Space and weight constraints
3/5/2018 Slide 7
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UniGear Digital Typical customer problems during execution
– Approval process consumes time and resources
– Unexpected cost increases due to changes
– Delivery delays due to changes
– Delivery delays due to factory capacity loading
– Difficult protection function setting calculation (e.g. motor
feeders with low nominal current but network with high
short-circuit current)
3/5/2018 Slide 8
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UniGear Digital Typical customer problems during installation & commissioning
– Time constraints during installation and commissioning
– Interfacing and Troubleshooting during commissioning
– Handling of the changes
– Difficult panel manipulation (weight, dimensions)
– Cable connections are sometime difficult
– Installation of zero sequence / core balance CTs
3/5/2018 Slide 9
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UniGear Digital Typical customer problems during operation & maintenance
– Ferro-resonance on VT’s
– VT secondary terminals short-circuited
– CT secondary terminals opened-circuited
– Risk of insulation degradation
– It is difficult to make changes in the feeder nominal currents
due to load changes (necessary to change conventional CT)
– Energy losses
– Reliability
3/5/2018 Slide 10
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New technologies – Digital SensorsChallenges using conventional CT’s and VT’s
– In the past required separate units for protection, control , metering and
communication functions, with multiple CT cores or even multiple CT’s needed,
– Very often had space and assembly problems for large CT’s / VT’s
– Long switchgear delivery times
– Complex CT calculations are needed for high end protection, based on extensive
research for network parameters
– No flexibility in case of changing application conditions
– Modern protection and control devices don‘t need “high“ power current and voltage
signals resulting in the CT and VT power just being converted into thermal energy
– Safety concerns
© ABB
05 March 2018 | Slide 11
—New technologies – Digital SensorsABB solution is UniGear Digital
3/5/2018 Slide 12
IED
IEC 61850
Voltage sensors
Current sensors
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Don’t require as many technical parameters to be defined as instrument transformers
New technologies – Digital Sensors
March 5, 2018 Slide 13
Parameters needed are:
– Rated primary current
– Rated primary voltage
– Rated short-circuit current
Specification
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Have smaller dimensions and are easy to handle
New technologies – Digital Sensors
March 5, 2018 Slide 14
Instrument Transformers Sensors
▪Current
▪sensor
▪Voltage
▪sensor
▪Voltage
▪transformer
▪Current
▪transformer
▪1piece=18kg ▪1piece=27kg ▪1piece=0.5kg ▪1piece=2kg
▪3x18 + 3x27=135kg ▪3x0.5 + 3x2=7.5kg
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Provide error free connection and have safe secondary signal
New technologies – Digital Sensors
March 5, 2018 Slide 15
▪Current sensor ▪Voltage sensor▪Protection relay
▪Shielded cable with RJ45
▪OR
▪150mV at 50Hz
▪180mV at 60Hz
▪Ratio 1:10 000
▪e.g. 2V at 20kV
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Parameters: Rogowski coil defined
Current Sensor characteristics
3/5/2018 Slide 16
▪IP
▪US
dt
tdiMtu
p
s
)()(
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Digital communication instead of hardwires
Delivery time
3/5/2018 Slide 17
…
…
▪ Conventional approach
▪ Wiring between devices must be
done individually per signal
▪ Digital communication
▪ Only one network cable & number
of interconnections = devices
▪ Easily extendable
▪ High performance of IEC 61850-9-2
▪ Signal sharing for interlocking and
automation schemes via Ethernet
communications
▪ Supervision of signals
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Testing sensors – ethernet based
Digital UniGear
March 5, 2018 Slide 19
Analogue signal:
• 3 x I (150mV for 50Hz system)
• 3 x U (2V/√3 for 20kV system)
Tester
Adapter cable
Testing adapter CMLIB REF 6xx by Omicron
Shielded cable with RJ-45 connectors
Switchgear LV
compartment
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Keep project time
schedule
Keep cost targets
Flexible to changes
Maximize integration
Comply with specifications and standards
ABB solution is UniGear Digital
UniGear Digital
3/5/2018 Slide 21
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Digital medium-voltage switchgear
UniGear Digital references worldwide
References
3/5/2018 Slide 22