use of diagnostic and condition assessment techniques for ... pdfs/colin... · on/off site on/off...
TRANSCRIPT
Prague, 8-11 June 2009
Colin Gardner – United Kingdom
Use of diagnostic and condition assessment techniques for asset risk management
Colin GardnerHead of Asset Management
EDF Energy Networks
Prague, 8-11 June 2009
Colin Gardner – United Kingdom
Contents
• Use of diagnostic techniques/condition monitoring for asset risk management
• Examples of techniques in use– Transformers– Switchgear– Overhead Lines– Underground Cables
• Summary
Scottish Power
CE ElectricENW
CE Electric
ScottishPower
WesternPowerDistribution
CentralNetworks
Scottish &Southern
Scottish &Southern
14.6 GW peakdemand
7.9 million homesand businesses
Prague, 8-11 June 2009
Colin Gardner – United Kingdom
Condition monitoring and diagnostic testing context
Measure Process ActInterpret
MaintainReplaceDevelopRepair
Operate
Assess capacityRemnant life
ReliabilityPolicies
etc.
Condition monitoring
SenseObserveSample
On/off siteOn/off line
Continuous/testAll/sample
ModelsAlgorithms
Diagnostic testing Communication
Monitoring requirements
Prague, 8-11 June 2009
Colin Gardner – United Kingdom
Condition based risk management
CombinedHealth Index
Future – withintervention
InterventionRepair
RefurbishReplace
CombinedHealth Index
Future – nointervention
CombinedHealth Index
Existing
DegradationFailure mech.Environment
Duty
Investmentplan
ExistingRisk
Future Riskno intervention
Future Riskwith intervention
Consequencesnetwork performance, safety, cost, environment
Criticality
Condition
Probabilityof failure
Prague, 8-11 June 2009
Colin Gardner – United Kingdom
ASSET CONDITION CATEGORIES
• 4 point condition scoring: 1 as new, 4 end of life• Multiple condition points for each asset• Condition 3 triggers refurbishment if economic• Condition 4 triggers high volume asset replacement• Individual detailed assessment for high value assets • Type defects trigger additional condition monitoring
Prague, 8-11 June 2009
Colin Gardner – United Kingdom
Health IndexYear 0 Health Index Profile
0
100
200
300
400
500
600
700
800
0-1 1-2 2-3 3-4 4-5 5-6 6-7 7-8 8-9 9-10 10+ NoResult
Category
Num
ber o
f Ass
ets
Primary CB Distribution SG Distribution CB Other
Year 10 Health Index Profile
0
100
200
300
400
500
600
700
0-1 1-2 2-3 3-4 4-5 5-6 6-7 7-8 8-9 9-10 10+ NoResult
Category
Num
ber o
f Ass
ets
Primary CB Distribution SG Distribution CB Other
% Replacement Intervention HI Profile at Year 10
0100200300400500600700
0-1 1-2 2-3 3-4 4-5 5-6 6-7 7-8 8-9 9-10 10+ NoResult
Category
Num
ber o
f Ass
ets
Primary CB Distribution SG Distribution CB Other
Year 0 Year 10
Year 10 withreplacement
Health index shift
Prague, 8-11 June 2009
Colin Gardner – United Kingdom
Asset RiskTotal Condition and Non-Condition Risk
0
200,000
400,000
600,000
800,000
1,000,000
1,200,000
1,400,000
1,600,000
Netw orkPerformance
Safety Opex Capex Environmental
Valu
e of
Ris
k
Year 0 Risk Profile Year 10 Risk Profile Year 10, % replacement
Year 10, Targeted Intervention Risk of New Assets
Prague, 8-11 June 2009
Colin Gardner – United Kingdom
TRANSFORMERS
• Routine oil tests• On-line oil monitoring• Winding temperature
sensing• Thermal imaging• Tap changer operations
and motor current• Partial discharge• Bushing tests• External condition • Management systems
Prague, 8-11 June 2009
Colin Gardner – United Kingdom
On line moistureremoval
Automatic breathers
Vacuumtap changer
On line gas and moisture monitorGood coatingsTemperature sensingOn line management systems
MEASURES TO MINIMISE MAINTENANCE AND EXTEND LIFE
Conservatorair bag
Prague, 8-11 June 2009
Colin Gardner – United Kingdom
ROUTINE OIL SAMPLING:
Indicates the condition of core, winding and insulation
The routine tests comprise: • Dissolved gas analysis• Moisture content• Acidity• Breakdown voltage• Furan content• PCB content
Good condition Bad
Condition based on oil results
0
50
100
150
200
250
300
350
400
1 2 3 4Condition Code
Tran
sfor
mer
s
Prague, 8-11 June 2009
Colin Gardner – United Kingdom
Actual Tap Position
Duke Street T1 132/11/11kV132kV Winding
11kV Winding 211kV Winding 1
ATM MO150 STATUS (ACTIVE/FAIL)
Tank Temp. °C
Highest Winding Hot-Spot Temp. °C132kV Winding Hot-Spot Temp. °C11kV Winding 1 Hot-Spot Temp. °C
11kV Winding 2 Hot-Spot Temp. °C
Winding Bubbling Temp. Margin °C
THERMAL INDICATIONS
TAP CHANGER TANK
MAIN TANKTop Tank Oil Temp. °C Hydran Level, Main tank (ppm) *
%RH Level
Winding Paper Moisture Content (ppm) *
Insulating Barrier Moisture Content (ppm) *
Hydran Level, Tap Changer Tank (ppm) *
Hydran Level, COOLING CIRCUIT (ppm) *
GAS & MOISTURE MEASUREMENTS
Cooling Efficiency Index *
DERIVED TRANSFORMER CONDITION
SCADA OPERATIONAL DISPLAY
Prague, 8-11 June 2009
Colin Gardner – United Kingdom
Actual Tap Position
TC Tank Temp. °C
Highest Winding Hot-Spot Temp. °C132kV Winding Hot-Spot Temp. °C11kV Winding 1 Hot-Spot Temp. °C
11kV Winding 2 Hot-Spot Temp. °C
Short Term Average Differential °CLong Term Average Differential °C
Winding Bubbling Temp. Margin °C
THERMAL INDICATIONS
TAP CHANGER TANK
MAIN TANKTop Tank Oil Temp. °C
Hydran Level, Main tank (ppm)
Hydran Level Hourly Trend, Main tank (ppm)
%RH Level
Winding Paper Moisture Content (ppm)
Insulating Barrier Moisture Content (ppm)
Hydran Level, OLTC Selector (ppm)
Hydran Level, COOLING CIRCUIT RETURN (ppm)
GAS & MOISTURE MEASUREMENTS
Cumulative Aging (days)
Cooling Efficiency Index
DERIVED TRANSFORMER CONDITION
Cumulative Age (days)
TREND ANALYSIS Duke Street T1 132/11/11kV
TREND DISPLAYS…
Make use of comprehensive PI data analysis in PI ProcessBook
LONG TERM ASSET MANAGEMENT
Prague, 8-11 June 2009
Colin Gardner – United Kingdom
SWITCHGEAR
• Partial Discharge– TEV, ultrasound, UHF
• Circuit breaker timing– Test– SCADA timing
• Fluid pressure and density
• Fluid tests• Contact wear• Thermal imaging• Protection and control
supervision
Prague, 8-11 June 2009
Colin Gardner – United Kingdom
PARTIAL DISCHARGE DETECTION (Handheld)
• Detects Transient Earth Voltage using a contact probe and by monitoring airborne ultrasonic signals
• Simple to use: Red, Amber and Green indications
• Used during routine substation inspection
Ultra TEV PD Surveyor
Prague, 8-11 June 2009
Colin Gardner – United Kingdom
PARTIAL DISCHARGE DETECTION (Monitoring)
• Continuous monitoring of switchgear where discharge has been detected by some other measure
• Remotely monitored plus local alarm • Software enables point of discharge to be located
PDM03: TEV MonitorASM: TEV & Ultrasonic Monitor
Prague, 8-11 June 2009
Colin Gardner – United Kingdom
OVERHEAD LINES
• Helicopter and foot patrols
• High definition photography
• Thermal imaging• Conductor corrosion• Foundation corrosion• Residual strength
– Ultrasonic, wood poles– Sample mechanical tests
Prague, 8-11 June 2009
Colin Gardner – United Kingdom
HIGH RESOLUTION PHOTOGRAPHS
20 to 40 photographs taken of each tower from a helicopter
Used for investment planning and procurement
Corroded Bracings
Frayed Earth Wire
Prague, 8-11 June 2009
Colin Gardner – United Kingdom
Overhead Line Health Indices
Health indices show the condition of individual components.
Anti
Clim
bing
Gua
rd
Barb
ed W
ire
Barb
ed W
ire S
pace
rs
Conc
rete
Con
ditio
n
Whe
ther
Pai
nted
Pain
t Co
nditi
on
Safe
ty S
igns
Prop
erty
Pla
te
Num
ber
Plat
e
Circ
uit
ID P
late
s Le
ft c
ct
Tow
er L
egs
Step
Bol
ts
Brac
ings
Cros
sarm
s
Peak
Pain
twor
k
U b
olts
or
Tow
er a
ttac
hmen
ts
Shac
kles
or
Link
s
Eart
hwire
Sus
pens
ion
Clam
ps
Eart
hwire
Ten
sion
Cla
mps
Eart
hwire
Jum
per
Eart
hwire
Bon
ds
Dam
pers
U b
olts
or
Tow
er a
ttac
hmen
ts
Shac
kles
and
Lin
ks
Insu
lato
rs
Arci
ng H
orns
Cond
ucto
r Su
spen
sion
Cla
mps
Cond
ucto
r Te
nsio
n Cl
amps
Vibr
atio
n D
ampe
rs
Cond
ucto
rs a
t cl
amps
Jum
pers
3 3 4 u u u 1 1 1 3 3 3 4 3 3 4 2 3 3 u 2 3 4 1 4 4 3 1
3 3 3 4 y 3 1 1 1 m 3 3 4 3 3 4 2 2 2 1 2 3 4 1 m 4 2 1
3 3 3 u u u 1 1 1 1 3 3 3 3 3 4 3 3 2 1 3 3 4 1 4 4 3 1
3 3 2 4 y 2 1 1 1 1 3 3 3 3 3 4 2 3 2 1 2 3 4 1 4 4 2 1
3 3 3 4 y 2 1 1 u 1 3 3 3 3 4 4 2 2 2 1 2 4 4 1 4 4 3 1
3 2 4 3 y 2 1 1 u 1 2 2 3 3 3 4 2 u u u 2 3 4 1 4 4 3 1
4 2 2 u u u 1 1 1 1 2 2 2 3 3 4 u u 1 1 1 2 u u 1 2 2 3 1 1
3 3 3 u u u 1 1 u 1 3 3 3 3 3 4 u u u u 2 u 4 1 4 4 2 u
3 2 2 u u u 1 1 u 1 3 3 3 3 3 4 u u u u 2 u 4 1 4 4 2 u
ACD Muffs Signs Tower Steelwork Earthwire Insulators And Fittings
Prague, 8-11 June 2009
Colin Gardner – United Kingdom
UNDERGROUND CABLES
• Partial discharge mapping (on/off line)
• Fluid pressure• PFT fluid leak detection• Distributed Temperature
Sensing • Cable and joint sample
assessments
Prague, 8-11 June 2009
Colin Gardner – United Kingdom
PARTIAL DISCHARGE MONITORING EQUIPMENT – MV Cables
ON-LINE CONDITION MONITORING
ANALYSIS: WEB INTERFACE
Prague, 8-11 June 2009
Colin Gardner – United Kingdom
AVOIDANCE OF AN MV CABLE FAULT
Location (meters)1,0009008007006005004003002001000
All P
hase
s PD
2,000
1,800
1,600
1,400
1,200
1,000
800
600
400
200
0
Location of discharge
ON-LINE MAPPING
OFF-LINE MAPPING
Location of discharge
STAGE 1: On-line monitoring
0m154 442 840 904 1009m
0.3 Cu 300 CAS 0.3 Cu 0.3 Cu 300 CAS 0.3 CuCHATAM
WESTPrimary
South Hill
OVERLAY
DISCHARGING AREA
INCREASING PD ACTIVITY
NO DISCHARGES FOLLOWING RE-ENERGISATIONCABLE ANALYSIS
Prague, 8-11 June 2009
Colin Gardner – United Kingdom
FLUID FILLED CABLES (FFC)
• Approximately 2,500km of fluid-filled cable, containing approximately 27 million litres of fluid
• Over 50% of the London HV network is FFC
• Most cables installed in the 1960s, some date back to 1930s
• Risk based repair and replacement based on
– Environmental sensitivity– Condition and criticality– Leak detection techniques
Prague, 8-11 June 2009
Colin Gardner – United Kingdom
FFC ENVIRONMENTAL RISK ASSESSMENT
Legend • Purple – Very
High Risk• Red – High
Risk• Orange –
Medium Risk• Yellow – Low
& Risk
Prague, 8-11 June 2009
Colin Gardner – United Kingdom
FFC CIRCUIT CLASSIFICATION
0.00
10.00
20.00
30.00
40.00
50.00
60.00
70.00
80.00
90.00
100.00
0.00 10.00 20.00 30.00 40.00 50.00 60.00
Environmental sensitivity
Con
ditio
n/ac
cess
ibili
ty/F
luid
loss
Prague, 8-11 June 2009
Colin Gardner – United Kingdom
FLUID FILLED CABLES: CABLE PRESSURE MONITORING
WINTER
SUMMER
LOSS OF PRESSURE DUE
TO OIL LEAK
Prague, 8-11 June 2009
Colin Gardner – United Kingdom
Reduced leakage, repairs and replacement
PerFluorocarbon Tracer CABLE LEAK LOCATION
Prague, 8-11 June 2009
Colin Gardner – United Kingdom
Summary
• A range of techniques developed – some on line some stand alone
• New equipment specified to enable diagnostic testing/condition monitoring
• Essential support for asset risk management• Need to develop fully integrated approach• Key component of Smart Grids