health monitoring of overhead power transmission · pdf filevth samco workshop monitoring of...
TRANSCRIPT
Health Monitoring of Overhead Power Transmission Line:
User Needs
Vth SAMCO WorkshopVienna
26-27 January, 2004
Dmitri SNEGOVSKI (Mech. Eng., PhD student)Transmission and Distribution of Electrical Energy
University of Liege - Montefiore Institute of Electricity
Belgium
Vth SAMCO Workshop Monitoring of Overhead Power Transmission Line – User Needs
Vienna, 26-27 January, 2004 2 ULG - Montefiore Institute of Electricity
Summary
1. Monitoring Problematics2. Sag & Temperature Monitoring3. Sensible Elements4. Damage Diagnostics5. Wind-Induced Vibrations6. Vibration Measurement7. Conclusions
Vth SAMCO Workshop Monitoring of Overhead Power Transmission Line – User Needs
Vienna, 26-27 January, 2004 3 ULG - Montefiore Institute of Electricity
1. What the User Needs NOT?
New York - August 14, 2003 Black-Out in USA, initiated by increased conductor sag due to overheat
Vth SAMCO Workshop Monitoring of Overhead Power Transmission Line – User Needs
Vienna, 26-27 January, 2004 4 ULG - Montefiore Institute of Electricity
Concerns
Ageing Increasing Power LoadsDeregulation in Power Transmission
Vth SAMCO Workshop Monitoring of Overhead Power Transmission Line – User Needs
Vienna, 26-27 January, 2004 5 ULG - Montefiore Institute of Electricity
Impacts
WindCorrosionContamination
Vth SAMCO Workshop Monitoring of Overhead Power Transmission Line – User Needs
Vienna, 26-27 January, 2004 6 ULG - Montefiore Institute of Electricity
Real-time & Permanent
Nondestructive & Hotline Mounted
Predictive, Secure, Controllable etc.
What kind of monitoring user needs?
Vth SAMCO Workshop Monitoring of Overhead Power Transmission Line – User Needs
Vienna, 26-27 January, 2004 7 ULG - Montefiore Institute of Electricity
> Maintenance > Optimal Power Delivery
Why Real-time & Permanent?
Vth SAMCO Workshop Monitoring of Overhead Power Transmission Line – User Needs
Vienna, 26-27 January, 2004 8 ULG - Montefiore Institute of Electricity
Ageing
Wind-induced motion
> Maintenance > Optimal Power Delivery
Prevent hazards…
Why Real-time & Permanent?
Vth SAMCO Workshop Monitoring of Overhead Power Transmission Line – User Needs
Vienna, 26-27 January, 2004 9 ULG - Montefiore Institute of Electricity
Sag
> Maintenance > Optimal Power Delivery
Why Real-time & Permanent?
Sag and/or Temperature Monitoring
Vth SAMCO Workshop Monitoring of Overhead Power Transmission Line – User Needs
Vienna, 26-27 January, 2004 10 ULG - Montefiore Institute of Electricity
Sag
> Maintenance > Optimal Power Delivery
Sag and/or Temperature Monitoring
Why Real-time & Permanent?
Vth SAMCO Workshop Monitoring of Overhead Power Transmission Line – User Needs
Vienna, 26-27 January, 2004 11 ULG - Montefiore Institute of Electricity
Sag
> Maintenance > Optimal Power Delivery
Sag and/or Temperature Monitoring
Why Real-time & Permanent?
Vth SAMCO Workshop Monitoring of Overhead Power Transmission Line – User Needs
Vienna, 26-27 January, 2004 12 ULG - Montefiore Institute of Electricity
2. Sag monitoring methods
© PTI, Inc.
Vth SAMCO Workshop Monitoring of Overhead Power Transmission Line – User Needs
Vienna, 26-27 January, 2004 13 ULG - Montefiore Institute of Electricity
Load cells for tension monitoring
SDG&E CAT monitor installed on a 230 kV anchor tower.
Direct radio communications are established with the ground station (GS).
GS dumps the data to the post via telephone line.
Tension monitoringCAT monitor
Vth SAMCO Workshop Monitoring of Overhead Power Transmission Line – User Needs
Vienna, 26-27 January, 2004 14 ULG - Montefiore Institute of Electricity
Sag monitoring
TargetCamera
Datalogger & Communications
Meteo (optional)
Sagometer (EDM International, Inc.)
Vth SAMCO Workshop Monitoring of Overhead Power Transmission Line – User Needs
Vienna, 26-27 January, 2004 15 ULG - Montefiore Institute of Electricity
3.OHL Sensible elements
1. Conductors2. Fittings (spacers, insulator chains, …)3. Towers
Vth SAMCO Workshop Monitoring of Overhead Power Transmission Line – User Needs
Vienna, 26-27 January, 2004 16 ULG - Montefiore Institute of Electricity
Conductor damages
Fretting fatigue of second layer of strand (left) or surface failure (right)
Vth SAMCO Workshop Monitoring of Overhead Power Transmission Line – User Needs
Vienna, 26-27 January, 2004 17 ULG - Montefiore Institute of Electricity
Conductor damages
Strand breaking due to corrosion
Vth SAMCO Workshop Monitoring of Overhead Power Transmission Line – User Needs
Vienna, 26-27 January, 2004 18 ULG - Montefiore Institute of Electricity
Conductor damages
Vth SAMCO Workshop Monitoring of Overhead Power Transmission Line – User Needs
Vienna, 26-27 January, 2004 19 ULG - Montefiore Institute of Electricity
Conductor damages
Aeolian vibration-induced damages of conductor - contact with suspension saddle
Vth SAMCO Workshop Monitoring of Overhead Power Transmission Line – User Needs
Vienna, 26-27 January, 2004 20 ULG - Montefiore Institute of Electricity
Aeolian vibration-induced damages of conductor - contact with Aircraft Warning Marker
Conductor damages
Vth SAMCO Workshop Monitoring of Overhead Power Transmission Line – User Needs
Vienna, 26-27 January, 2004 21 ULG - Montefiore Institute of Electricity
Tower Damages
Aeolian vibrationGalloping
Vth SAMCO Workshop Monitoring of Overhead Power Transmission Line – User Needs
Vienna, 26-27 January, 2004 22 ULG - Montefiore Institute of Electricity
Other:
Spacers, spacer dampersVibration dampersInsulatorsAircraft warning markersetc.
Twin bundle spacer damper
Stockbridge damper
Insulator chain
Vth SAMCO Workshop Monitoring of Overhead Power Transmission Line – User Needs
Vienna, 26-27 January, 2004 23 ULG - Montefiore Institute of Electricity
4. Damage Diagnostic Methods
Corona Discharge-based (CM)Electro-magnetic Acoustic (EMAT)Space potential probes (EPRI project)
Vth SAMCO Workshop Monitoring of Overhead Power Transmission Line – User Needs
Vienna, 26-27 January, 2004 24 ULG - Montefiore Institute of Electricity
EMAT (Electro Magnetic Acoustic Transducer)Colorado School of Mines, U.S.A.
Damage Diagnostic
Vth SAMCO Workshop Monitoring of Overhead Power Transmission Line – User Needs
Vienna, 26-27 January, 2004 25 ULG - Montefiore Institute of Electricity
+ Can be used on live (hot) conductors
+ Allows detecting minor defects
- Time-limited
EMAT(Electro Magnetic Acoustic Transducer)
Vth SAMCO Workshop Monitoring of Overhead Power Transmission Line – User Needs
Vienna, 26-27 January, 2004 26 ULG - Montefiore Institute of Electricity
5. Diagnose the Wind - Induced Vibrations
• UnavoidableTurbulence-induced
• Necessary to minimize:GallopingWake-induced vibrationsAeolian vibrations
Vth SAMCO Workshop Monitoring of Overhead Power Transmission Line – User Needs
Vienna, 26-27 January, 2004 27 ULG - Montefiore Institute of Electricity
Aeolian Vibration
Oscillation Amplitude
~ 1 D
Vth SAMCO Workshop Monitoring of Overhead Power Transmission Line – User Needs
Vienna, 26-27 January, 2004 28 ULG - Montefiore Institute of Electricity
Wake-Induced Vibration
γ z− &
xV &−
DFLF
rV
ZF
XFx&z&
Wind
Vth SAMCO Workshop Monitoring of Overhead Power Transmission Line – User Needs
Vienna, 26-27 January, 2004 29 ULG - Montefiore Institute of Electricity
Turbulence-Induced Buffeting
-16
-14
-12
-10
-84 6 8 10 12 14 16 18
Y, m
Z, m ASTERAERO-Z
4035 302520151050
10.00 14.00 18.00 22.00 02.00 06.00Time (Hrs)
Vth SAMCO Workshop Monitoring of Overhead Power Transmission Line – User Needs
Vienna, 26-27 January, 2004 30 ULG - Montefiore Institute of Electricity
Galloping
0LD
C Cy
∂+ <
∂
Wind Ice
Vth SAMCO Workshop Monitoring of Overhead Power Transmission Line – User Needs
Vienna, 26-27 January, 2004 31 ULG - Montefiore Institute of Electricity
6. Vibration Measurement
Existing measuring devices
SEFAG vibration recorder (Conductor diameter: about 0.03 m)
Vth SAMCO Workshop Monitoring of Overhead Power Transmission Line – User Needs
Vienna, 26-27 January, 2004 32 ULG - Montefiore Institute of Electricity
Heavy weight (more than 5 kg) - > conductor fatigue
High cost (~10000 €) Limited Autonomy
Vibration Measurement
Impossible to detect reliably the large amplitude at mid-spanHigher frequencies cannot be recorded.
Vth SAMCO Workshop Monitoring of Overhead Power Transmission Line – User Needs
Vienna, 26-27 January, 2004 33 ULG - Montefiore Institute of Electricity
7. Conclusions?
Health Monitoring of Overhead Transmission Lines is of increasing importance
Tension & sag monitoring is more elaborated but still a competitive field
OHL conductor vibration monitoring devices have limitations (cost, monitoring period)
Diagnostic of damages and hazards in OHL needs both « Artificial Intelligence » and hardware tools.
Vth SAMCO Workshop Monitoring of Overhead Power Transmission Line – User Needs
Vienna, 26-27 January, 2004 34 ULG - Montefiore Institute of Electricity
The most challenging studies…
Vth SAMCO Workshop Monitoring of Overhead Power Transmission Line – User Needs
Vienna, 26-27 January, 2004 35 ULG - Montefiore Institute of Electricity
…are the worst garnished!
Vth SAMCO Workshop Monitoring of Overhead Power Transmission Line – User Needs
Vienna, 26-27 January, 2004 36 ULG - Montefiore Institute of Electricity
Jean-Louis Lilien
Dmitri [email protected]
tel.(04) 366-26-30