ABB Digital medium-voltage switchgear

Transcription

1 NAMIBIA AMEU/AEDU MARCH 2018 ABB Digital medium-voltage switchgear Barry Addinall

2 UniGear Digital Contents 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

3 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 realtime Ethernet communication bus over the IEC 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

4 Distribution networks are getting more complex Demand on MV switchgear increases Be simple! Be reliable! Be smart! Be on time! Be flexible! Be environmental friendly! Be future proof! Be efficient! Be easy! Be safe! 3/5/2018 Slide 4

5 UniGear Digital Addresses 3 main areas of benefits Future-proof solution Increases substation availability Lowers overall costs UniGear Digital = less worries in your electrical network March 5, 2018 Slide 5

6 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

7 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

8 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

9 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

10 New technologies Digital Sensors Challenges 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

11 New technologies Digital Sensors ABB solution is UniGear Digital Current sensors IED IEC Voltage sensors 3/5/2018 Slide 12

12 New technologies Digital Sensors Don t require as many technical parameters to be defined as instrument transformers Specification Parameters needed are: Rated primary current Rated primary voltage Rated short-circuit current March 5, 2018 Slide 13

13 New technologies Digital Sensors Have smaller dimensions and are easy to handle Instrument Transformers Sensors Current transformer Voltage transformer Current sensor Voltage sensor 1piece=18kg 1piece=27kg 1piece=0.5kg 1piece=2kg 3x18 + 3x27=135kg 3x x2=7.5kg March 5, 2018 Slide 14

14 New technologies Digital Sensors Provide error free connection and have safe secondary signal Current sensor OR Voltage sensor Shielded cable with RJ45 Protection relay 150mV at 50Hz 180mV at 60Hz Ratio 1: e.g. 2V at 20kV March 5, 2018 Slide 15

15 Current Sensor characteristics Parameters: Rogowski coil defined I P U S u s ( t) M di p dt ( t) 3/5/2018 Slide 16

16 Delivery time Digital communication instead of hardwires 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 Signal sharing for interlocking and automation schemes via Ethernet communications Supervision of signals 3/5/2018 Slide 17

17 Digital UniGear Testing sensors ethernet based Switchgear LV compartment Testing adapter CMLIB REF 6xx by Omicron Tester Adapter cable Analogue signal: 3 x I (150mV for 50Hz system) 3 x U (2V/ 3 for 20kV system) Shielded cable with RJ-45 connectors March 5, 2018 Slide 19

18 UniGear Digital ABB solution is UniGear Digital Keep project time schedule Comply with specifications and standards Keep cost targets Maximize integration Flexible to changes 3/5/2018 Slide 21

19 References Digital medium-voltage switchgear UniGear Digital references worldwide 3/5/2018 Slide 22

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21 UniGear Digital Question time Question Answer March 5, 2018 Slide 24

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