DISTRIBUTION FEEDER FAULT ANALYSIS...due to 115 kv underbuild. elbow failure on ug. scada alarm at...
Transcript of DISTRIBUTION FEEDER FAULT ANALYSIS...due to 115 kv underbuild. elbow failure on ug. scada alarm at...
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T I L L A M O O K P E O P L E ’ S U T I L I T Y D I S T R I C T
DISTRIBUTION FEEDER FAULT ANALYSIS
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SCADA TO DG SITES
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DIGESTER MW AND MVAR
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INSTANTANEOUS READINGSFROM SEL 751 RELAY
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TRASK SUBSTATION LOADINGDO NOT WANT TO FEED INTO 115 KV
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FAULT LOCATOR TOOL DEVELOPED BY GIS SPECIALIST
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CAR HIT POLE EVENT ANALYSIS
W I L S O N R I V E R S U B S T A T I O N E V E N T O N 9 - 2 - 1 3
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WILSON RIVER SUBSTATION, CIRCUIT 63
Car Pole Accident
Olsen Rd.Recloser
Misty MeadowsGeneration
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SCADA ALARMS DURING EVENTNOTE: DEVICE TIMES ARE NOT
SYNCHED
DG on adjacent circTripped Open
Olsen Rd. RecloserOperations
Ckt 63 RecloserLocks Out
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SOE FROM SUBSTATION RECLOSER
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OLSEN RD. RECLOSER OPERATIONS
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NEXUS 1500 METER ON SUBSTATION BUS
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A PHASE CURRENT – 2 OPERATIONS OF RECLOSER
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3RD INTERRUPTION – MUCH HIGHER FAULT CURRENT
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SEL 751 AT MISTY MEADOWS GENERATION 480 VOLT BUS
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MAX FLT I = 3078 AMPS AT ACCIDENT SITE
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SO HOW DID WE GET 4178 AMPS ON THE CIRCUIT 63 SEQUENCE OF EVENTS FILE?
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SYNERGI PREDICTS A FAULT OF THIS MAGNITUDE SHOULD BE CLOSER IN TO
THE SUBSTATION
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THIS IS SECTION OF LINE THAT SYNERGIPREDICTED THE FAULT SHOULD BE IN
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A SHARP EYED OPS SUPV. FOUND BURN MARKS IN THIS VICINITY. LONG SPANS
DUE TO 115 KV UNDERBUILD
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ELBOW FAILURE ON UG
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SCADA ALARM AT 17:10 INDICATES FAULT ON NESTUCCA FEEDER 39
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FIRST STEP IS TO CONNECT TO FORM 6 RELAY OVER ETHERNET – SEQ COORD. MEANS ANOTHER DEVICE OPERATED
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OSCILLOGRAPHIC FILE FROM THE FORM 6 RELAY – PEAK CURRENT =1737 A
1737 X .707=1228 A RMS
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FAULT LOCATION TOOL THAT GIS SPECIALIST MADE – FLT I FROM SYNERGI PROTECTION STUDY
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FAULT WAS ON SINGLE PHASE UG IN SUBDIVISION – ELBOW FAILED
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EXTENT OF FEEDERPOSSIBLE LOCATIONS ON MULTIPLE BRANCHES
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FIRST RAIN AFTER DRY SUMMER
T I LLAMOOK PEOPLE’S UT I L I TY D ISTR ICT
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FIRST INDICATION OF PROBLEMSCADA SHOWS FAULT ON CKT. 64
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NEXUS 1500 ON SUB BUS
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ZOOM IN ON PHASE A AND B CURRENTS
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THE 3 PHASE CURRENTS ON CIRCUIT 64
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COMPARE WAVEFORMS TO FORM 62ND PHASE GETS INVOLVED
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OUTAGE REPORT SHOWS INSULATOR FLASHED OVER
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PROBLEMS AT TCCA BOILERTCCA=T I LLAMOOK CHEESE FACTORY
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FORM 6 OSCILLOGRAPHPEAK CURRENT = 3820 AMPSRMS CURRENT = 2700 AMPS
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NEXUS 1500 ON SUB BUS
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NEXUS FAULT CURRENT IS CLOSE TO FORM 6 VALUE = 3900A X .707=2757 A,
NOTE DROP IN LOAD
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FROM SYNERGI, FAULT CURRENT AT BOILER MATCHES MEASURED FAULT I
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FAULT LOCATOR TOOL PRETTY CLOSE
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TREE THROUGH LINEMOHLER CIRCUIT 91
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RECLOSER AT SUB SHOWS 428 A FAULT CURRENT ON C PHASE
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OSCILLOGRAPH FROM FORM 6 SHOWS FOUR CYCLES OF FAULT CURRENT
4 CYCLES = .066 SEC.
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FAULT BLEW A 15 A FUSE AT FISH HATCHERY
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TCC CURVE SHOWS THAT 15 A FUSE SHOULD BLOW IN .06 SEC. AT 425 AMPS
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FAULT LOCATOR TOOL TURNED OUT TO BE FAIRLY ACCURATE
Fuse Blew Here
Tree throughLine Here
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SYNERGI PREDICTS 411 AMPS FAULT CURRENT AT THIS LOCATION
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F A U L T E V E N T O N 1 1 - 9 - 1 5
STARLING BRINGS DOWN BLUE HERON
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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
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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
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ALSO DOWNLOADED OSCILLGRAPHYFILES FROM THE RECLOSERS
• Confirmed fault on Ckt 62
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CONTINUATION OF WAVEFORM ON PRIOR SLIDE
• Note that second phase gets involved in fault in the last couple cycles before interruption
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AFTER THE RECLOSER RECLOSED THE TRANSFORMER MAGNETIZING CURRENT WAS PRESENT
• After a few cycles, the magnetizing current decayed to below the minimum pickup value
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NEXUS 1500 METER MONITORING THE TRANSFORMER BUS GIVES A BETTER PICTURE OF THE EVENT
• Note that 2nd phase gets involved before breaker opens. And transformer inrush currents can be seen
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ZOOMING IN TO PHASE B
• The recloser was open for 2010 ms (2 sec.)
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PLUGGED FAULT CURRENTS INTO FAULT LOCATOR TOOL TO PREDICT LOCATION OF FAULT
• Area highlighted in red is most likely fault location
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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
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IT IS QUESTIONABLE THAT THE STARLING CAUSED THIS FAULT
• Usually takes a bigger bird to cause a phase-to-phase 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
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A 10-15-15 FAULT WAS SIMILAR TO THIS ONE AND NO CAUSE WAS FOUND
(COMPARE TO SLIDE 36)
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UG CABLE FAILUREL O C A T I O N P R E D I C T I O N G O O D
F L T I C O N T R I B U T I O N F R O M M I L L M O T O R S
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SCADA ALARMS
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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:
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CIRCUIT 63 – SECOND EVENTLINEMAN REFUSED THE RISER POLE
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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
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FROM PQ METER ON SUB BUSRMS VALUE OF FAULT CURRENT IS CLOSE TO WHAT THE FORM
6 SHOWS: 2165 A ON FORM 6, 2072 A ON NEXUSFAULT LASTED FOR 1.5 CYCLES = .0025 SEC
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FAULT LOCATION PREDICTION NOT FAR OFF
Fault on UG Cable
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SYNERGI PROTECTION STUDY PREDICTS MAX SLG FAULT CURRENT TO BE 2292 A AT
THIS LOCATION
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30 A FUSE SHOULD BLOW IN .019 SEC. AT 2165 AMPS. 1.5 CYCLES = .025 SEC.
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QUESTIONS?G A I L S H A W
G S H A W @ T P U D . O R G