Improving distribution systems reliability with Cutoutmounted single phase Reclosers

Transcription

1 Improving distribution systems reliability with Cutoutmounted single phase Reclosers AEDU Namibia Branch Meeting 16 March 2017, Swakopmund - Namibia

2 Outline Review of lateral protection philosophy fuse blowing fuse saving S&C TripSaver II what is it? ratings Features Application at Nored 2

3 Review of Lateral Protection Philosophy 3

4 Review of Lateral Protection Philosophy Fuse Blowing main feeder protected by station breaker/ recloser taps protected by fuses complete coordination between breaker and lateral fuse is required breaker/recloser cannot have a fast trip setting Fuse Saving main feeder protected by station breaker/recloser taps protected by fuses intentional mis-coordination on first shot breaker/recloser must have a fast trip setting 4

5 Review of Lateral Protection Philosophy Fuse Blowing benefit prevents momentary interruption to entire feeder drawback temporary faults on the lateral are cleared by the fuse resulting in a permanent outage 5

6 Time (seconds) Fuse Blowing Temporary or Permanent Fault Ground CO A, TD Lateral 100T Current (Amperes) 6

7 Time (seconds) Fuse Blowing Temporary or Permanent Fault Ground CO A, TD Lateral 100T Current (Amperes) 7

8 Review of Lateral Protection Philosophy Fuse Saving benefits temporary faults on the lateral are cleared by the breaker customers on the lateral see a short-duration outage, not a permanent outage drawbacks all customers on the main feeder experience a momentary interruption will not work in high fault current areas 8

9 Time (seconds) Fuse Saving Temporary Fault 10 Lateral 102 Phase IAC77 640A, TD A 0.1 Ground IAC55 (CO-2) 320A,TD Current (Amperes) 9

10 Time (seconds) Fuse Saving Temporary Fault 10 Lateral 102 Phase IAC77 640A, TD A 0.1 Ground IAC55 (CO-2) 320A,TD Current (Amperes) 10

11 Time (seconds) Fuse Saving Temporary Fault 10 Phase IAC77 640A, TD7 1 Lateral Current (Amperes) 11

12 Time (seconds) Fuse Saving Permanent Fault 10 Lateral 102 Phase IAC77 640A, TD A 0.1 Ground IAC55 (CO-2) 320A,TD Current (Amperes) 12

13 Time (seconds) Fuse Saving Permanent Fault 10 Lateral 102 Phase IAC77 640A, TD A 0.1 Ground IAC55 (CO-2) 320A,TD Current (Amperes) 13

14 Time (seconds) Fuse Saving Permanent Fault 10 Phase IAC77 640A, TD7 1 Lateral Current (Amperes) 14

15 Time (seconds) Fuse Saving Permanent Fault 10 Phase IAC77 640A, TD7 1 Lateral Current (Amperes) 15

16 Best of Both Worlds TripSaver II instead of lateral fuses gives customers the best of both worlds protects the laterals from temporary faults protects the main feeder from momentary interruptions for faults on the laterals TripSaver II economically achieves both objectives 16

17 TripSaver II Cutout-Mounted Recloser S&C s new, innovative, and cost-effective solution to lateral protection 17

18 TripSaver II Cutout-Mounted Recloser Self-powered electronically controlled vacuum interrupter (VI) mounted in a standard S&C or MacLean cutout mounting no batteries required no replaceable parts 23 pounds can be opened using Loadbuster no maintenance 18

19 TripSaver II Cutout-Mounted Recloser Self-powered electronically controlled vacuum interrupter (VI) mounted in a standard S&C or MacLean cutout mounting no batteries required no replaceable parts 23 pounds can be opened using Loadbuster no maintenance Drops open and automatically resets 19

20 TripSaver II Ratings 15.5 kv 110 kv BIL mounting Cont., Amperes Minimum Pick Up, Amperes Interr.,Sym. (Asym), Amperes (5 600) (8 800) 20

21 TripSaver II Ratings 29 kv 125kV or 150 kv BIL mounting Cont., Amperes Minimum Pick Up, Amperes Interr.,Sym. (Asym), Amperes (5 600) (8 800) 21

22 TripSaver II Operating Sequence Temporary Lateral Fault Operating sequence O 5 sec C O 5 sec C O 5 sec C reset after 15 seconds Selectable number of recloses (up to 3) 22

23 TripSaver II Operating Sequence Temporary Lateral Fault 2 TCCs, 1 Operation 23

24 TripSaver II Operating Sequence Temporary Lateral Fault 2 TCCs, 1 Operation 24

25 TripSaver II Operating Sequence Temporary Lateral Fault 2 TCCs, 1 Operation 25

26 TripSaver II Operating Sequence Permanent Lateral Fault Operating sequence O 5 sec C O 5 sec C O 5 sec C O drops open Selectable number of recloses (up to 3) After dropout 2 sec VI contacts close Operator manually closes TripSaver II 26

27 TripSaver II Operating Sequence Permanent Lateral Fault 2 TCCs, 2 Operations 27

28 TripSaver II Operating Sequence Permanent Lateral Fault 2 TCCs, 2 Operations 28

29 TripSaver II Operating Sequence Permanent Lateral Fault 2 TCCs, 2 Operations 29

30 TripSaver II Operating Sequence Permanent Lateral Fault 2 TCCs, 2 Operations 30

31 TripSaver II Mode Selector AUTO NR AEDU Namibia Branch Meeting 16 Note: March Colored 2017, label Swakopmund is covered completely when in AUTO mode 31

32 TripSaver II User Interface with LCD Screen Mode selector (AUTO / NR) LCD screen indicates VI Open / Close indicator overload and Service Soon load current last fault current operation counter VI remaining contact wear LCD screen internal ambient temperature number of sectionalizing counts selected (if feature is enabled) Six LCD languages supported Mode selector lever 32

33 TripSaver II LCD Screen Normal screen VI status Overload indicator (illuminates if TripSaver II trips and drops open on overload) Mode Service Soon (illuminates when VI remaining contact wear is 10% or less) 33

34 Application at Nored 34

35 About Nored Operating since 2002 Pioneer of REDs in SADC Vision to be the leading electricity distributor through best practices innovation and technology Mission To supply quality and affordable electricity to customers Operating voltages 11kV to 33kV and including 19kV SWER System First to acquire and successfully install the TripSaver II in Namibia 35

36 Application at Nored Application for 19.2kV SWER systems which are mostly radial, and span over 100km supplying key institutions and thousand households. Reasons for the trial project: Product cost reflectivity; Product Simplicity, little sophistication and ease of installation; Customized configuration; Timely Fault interruptions, resulting in reduced outage durations; Less waste of resources; Effortless communication with the device using its Magnetic tool. 36

37 Application at Nored 37

38 Application at Nored Installation was in January/2017 and one successful operation was recorded which was for a temporary fault which therefore avoided to send crews to the field Device operated matching exactly the protection curve which was set (131A fault lasted for 175ms) 38

39 Questions?