—NAMIBIA AMEU/AEDU MARCH 2018

ABB Digital medium-voltage switchgear

Barry Addinall

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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

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Question time

UniGear Digital

March 5, 2018 Slide 24

Answ

er

Question