DISTRIBUTION FEEDER FAULT ANALYSIS TILLAMOOK PEOPLE S UTILITY DISTRICT

Transcription

1 DISTRIBUTION FEEDER FAULT ANALYSIS TILLAMOOK PEOPLE S UTILITY DISTRICT

2 SCADA TO DG SITES

3 DIGESTER MW AND MVAR

4 INSTANTANEOUS READINGS FROM SEL 751 RELAY

5 TRASK SUBSTATION LOADING DO NOT WANT TO FEED INTO 115 KV

6 FAULT LOCATOR TOOL DEVELOPED BY GIS SPECIALIST

7 CAR HIT POLE EVENT ANALYSIS WILSON RIVER SUBSTATION EVENT ON

8 WILSON RIVER SUBSTATION, CIRCUIT 63 Misty Meadows Generation Olsen Rd. Recloser Car Pole Accident

9 SCADA ALARMS DURING EVENT NOTE: DEVICE TIMES ARE NOT SYNCHED Ckt 63 Recloser Locks Out Olsen Rd. Recloser Operations DG on adjacent circ Tripped Open

10 SOE FROM SUBSTATION RECLOSER

11 OLSEN RD. RECLOSER OPERATIONS

12 NEXUS 1500 METER ON SUBSTATION BUS

13 A PHASE CURRENT 2 OPERATIONS OF RECLOSER

14 3 RD INTERRUPTION MUCH HIGHER FAULT CURRENT

15 SEL 751 AT MISTY MEADOWS GENERATION 480 VOLT BUS

16 MAX FLT I = 3078 AMPS AT ACCIDENT SITE

17 SO HOW DID WE GET 4178 AMPS ON THE CIRCUIT 63 SEQUENCE OF EVENTS FILE?

18 SYNERGI PREDICTS A FAULT OF THIS MAGNITUDE SHOULD BE CLOSER IN TO THE SUBSTATION

19 THIS IS SECTION OF LINE THAT SYNERGI PREDICTED THE FAULT SHOULD BE IN

20 A SHARP EYED OPS SUPV. FOUND BURN MARKS IN THIS VICINITY. LONG SPANS DUE TO 115 KV UNDERBUILD

21 ELBOW FAILURE ON UG

22 SCADA ALARM AT 17:10 INDICATES FAULT ON NESTUCCA FEEDER 39

23 FIRST STEP IS TO CONNECT TO FORM 6 RELAY OVER ETHERNET SEQ COORD. MEANS ANOTHER DEVICE OPERATED

24 OSCILLOGRAPHIC FILE FROM THE FORM 6 RELAY PEAK CURRENT =1737 A 1737 X.707=1228 A RMS

25 FAULT LOCATION TOOL THAT GIS SPECIALIST MADE FLT I FROM SYNERGI PROTECTION STUDY

26 FAULT WAS ON SINGLE PHASE UG IN SUBDIVISION ELBOW FAILED

27 EXTENT OF FEEDER POSSIBLE LOCATIONS ON MULTIPLE BRANCHES

28 FIRST RAIN AFTER DRY SUMMER TILLAMOOK PEOPLE S UTILITY DISTRICT

29 FIRST INDICATION OF PROBLEM SCADA SHOWS FAULT ON CKT. 64

30 NEXUS 1500 ON SUB BUS

31 ZOOM IN ON PHASE A AND B CURRENTS

32 THE 3 PHASE CURRENTS ON CIRCUIT 64

33 COMPARE WAVEFORMS TO FORM 6 2 ND PHASE GETS INVOLVED

34 OUTAGE REPORT SHOWS INSULATOR FLASHED OVER

35 PROBLEMS AT TCCA BOILER TCCA=TILLAMOOK CHEESE FACTORY

36 FORM 6 OSCILLOGRAPH PEAK CURRENT = 3820 AMPS RMS CURRENT = 2700 AMPS

37 NEXUS 1500 ON SUB BUS

38 NEXUS FAULT CURRENT IS CLOSE TO FORM 6 VALUE = 3900A X.707=2757 A, NOTE DROP IN LOAD

39 FROM SYNERGI, FAULT CURRENT AT BOILER MATCHES MEASURED FAULT I

40 FAULT LOCATOR TOOL PRETTY CLOSE

41 TREE THROUGH LINE MOHLER CIRCUIT 91

42 RECLOSER AT SUB SHOWS 428 A FAULT CURRENT ON C PHASE

43 OSCILLOGRAPH FROM FORM 6 SHOWS FOUR CYCLES OF FAULT CURRENT 4 CYCLES =.066 SEC.

44 FAULT BLEW A 15 A FUSE AT FISH HATCHERY

45 TCC CURVE SHOWS THAT 15 A FUSE SHOULD BLOW IN.06 SEC. AT 425 AMPS

46 FAULT LOCATOR TOOL TURNED OUT TO BE FAIRLY ACCURATE Tree through Line Here Fuse Blew Here

47 SYNERGI PREDICTS 411 AMPS FAULT CURRENT AT THIS LOCATION

48 STARLING BRINGS DOWN BLUE HERON FAULT EVENT ON

49 TUESDAY MORNING AT 8:20 AM Public Relations called Operations to find out if a breaker operated at Wilson River Substation The Mill in town called to report a power dip SCADA showed that Circuit 61 had operated and Circuit 62 (Mill Feeder) saw current above Min Trip

50 ENGINEERING CONNECTED TO FORM 6 RECLOSER CONTROLS AT SUBSTATION VIA ETHERNET The Sequence of Events report from Ckt 61showed that the recloser tripped on Overcurrent, then reclosed and reset

51 ALSO DOWNLOADED OSCILLGRAPHY FILES FROM THE RECLOSERS Confirmed fault on Ckt 62

52 CONTINUATION OF WAVEFORM ON PRIOR SLIDE Note that second phase gets involved in fault in the last couple cycles before interruption

53 AFTER THE RECLOSER RECLOSED THE TRANSFORMER MAGNETIZING CURRENT WAS PRESENT After a few cycles, the magnetizing current decayed to below the minimum pickup value

54 NEXUS 1500 METER MONITORING THE TRANSFORMER BUS GIVES A BETTER PICTURE OF THE EVENT Note that 2 nd phase gets involved before breaker opens. And transformer inrush currents can be seen

55 ZOOMING IN TO PHASE B The recloser was open for 2010 ms (2 sec.)

56 PLUGGED FAULT CURRENTS INTO FAULT LOCATOR TOOL TO PREDICT LOCATION OF FAULT Area highlighted in red is most likely fault location

57 BLUE HERON RESTAURANT REPORTED HEARING A LOUD BANG DEAD STARLING WAS FOUND AT THE BASE OF A POLE NEAR THEM Blue Heron Dead Starling Predicted Fault Location

58 IT IS QUESTIONABLE THAT THE STARLING CAUSED THIS FAULT Usually takes a bigger bird to cause a phase-tophase fault Phase-to-phase fault current at location where starling was found did not match calculated fault current No burn marks from arcing were observed on the pole

59 A FAULT WAS SIMILAR TO THIS ONE AND NO CAUSE WAS FOUND (COMPARE TO SLIDE 36)

60 UG CABLE FAILURE LOCATION PREDICTION GOOD FLT I CONTRIBUTION FROM MILL MOTORS

61 SCADA ALARMS

62 INTERROGATE FEEDER BREAKERS Form 6 Recloser Controls did not show anything in Sequence of Events Files But they did capture Oscillographic waveforms The fault was on Circuit 63. The Form 6 on Ckt 63 showed two Oscillographic events First Event:

63 CIRCUIT 63 SECOND EVENT LINEMAN REFUSED THE RISER POLE

64 CIRCUIT 62 CONTRIBUTED FAULT CURRENT DUE TO LARGE MOTOR LOAD Note that current is going in the opposite direction as the current in Ckt 63

65 FROM PQ METER ON SUB BUS RMS VALUE OF FAULT CURRENT IS CLOSE TO WHAT THE FORM 6 SHOWS: 2165 A ON FORM 6, 2072 A ON NEXUS FAULT LASTED FOR 1.5 CYCLES =.0025 SEC

66 FAULT LOCATION PREDICTION NOT FAR OFF Fault on UG Cable

67 SYNERGI PROTECTION STUDY PREDICTS MAX SLG FAULT CURRENT TO BE 2292 A AT THIS LOCATION

68 30 A FUSE SHOULD BLOW IN.019 SEC. AT 2165 AMPS. 1.5 CYCLES =.025 SEC.

69 QUESTIONS? GAIL SHAW