Use of Online Monitoring and Data Optimisation Drives Condition Assessment on Service‐Aged Generator Step Up (GSU) Transformers Ami Singh, Ian Thompson, John Twiddle; SSE – Engineering Centre Brent Duder‐Findlay, Dynamic Ratings
Use of Online Monitoring and Data Optimisation Drives Condition Assessment on Service‐Aged Generator Step Up (GSU) Transformers
Ami Singh, Ian Thompson, John Twiddle; SSE – Engineering Centre Brent Duder‐Findlay, Dynamic Ratings
CCGT Site – 735MW
SLD – Site Commissioned in 1995
22 Year Asset(s) – 290MVA, 420/15kV
Asset History
Applying Loading Guide – Temperature Based Only
Loss of Life (Days)
HV LV
Tx 1 1.21 2.2Tx 2 1.14 1.77Tx 3 1.32 2.92
Based on 1 Year Data (Oct 2015‐Oct 2016)
For Asset Life – Lost of Life
Average DP From Furans
CO2/CO Ratio
Acidity of Oil
O2/N2 Ratio
BDV and Moisture in Oil
Installation of Additional Monitoring
Equipment Details
Processing Unit HV Bushing Monitoring PD Monitoring
Equipment Details
LV Couplers Tap Changer Monitoring Multi Gas Analyser (9 gas unit)
Equipment Details
Temperature Monitoring Additional Temperature Probes
Cooling System Monitoring
Equipment Details
Calibrations Bus Voltages, Power etc. Commissioning
Harvesting the
2014 – System Commissioned
2016 – Post Review
Digital/per Tx 56 275Analogue/ per Tx 42 527Total 294 2406
Block System of Predictive Analytical Tool
Traditional Monitoring vs Predictive Analytical Tool
System in Action
System in Action
High Level Interface
Maintenance History – Preventative or Corrective
1404 14171419
495 526279
0%10%20%30%40%50%60%70%80%90%
100%
CT1 CT2 ST
PM CM
Conclusions
• The 3 GSU transformers have experienced significant ageing to date.
• Asset owner has taken/is taking proactive steps to slow the ageing process.
• A health index tool is providing transparency on asset integrity.