The whole oil-analysis history of a fleet, one diagnosis per transformer.
A diagnostic database for transformer fleets. Dissolved-gas analysis and oil quality of every unit, read with the methods of IEC 60599 and IEEE C57.104, with a condition flag per transformer and a clear call: keep sampling, recondition, reclaim, or investigate. Built by HVCC for its own condition-assessment and life-extension work.
- Transformers in the example fleet
- 137
- Oil analyses on file
- 1,798
- Rogers · Doernenburg · key gas · Duval · TDCG · furans
- 6 methods
- Level rules
- IEC 60599 · IEEE C57.104
One file for the fleet, one screen per transformer.
Owners, transformers and analyses sit in one database. Pick a unit and every method is applied to its whole history, not to the last sample alone.
Where the history lives
Owners, transformers and analyses in a three-level tree, with reconditioning and reclamation events marked on the timeline and a traffic-light condition icon per unit based on its last analysis.
Six readings of the same gases
Rogers and Doernenburg ratios, key gas, Duval triangle, TDCG level and rate of increase, furans with degree of polymerisation and remaining life, plus paper-degradation and oil-oxidation ratios.
Is the oil still doing its job?
Breakdown voltage, water, tan δ, interfacial tension, acidity, particles and gas saturation against good, attention and low bands, ending in a reconditioning or reclamation verdict.
For whoever owns more transformers than diagnosticians.
A laboratory returns numbers. Turning fifteen years of numbers on a hundred units into a maintenance decision is the work this program was written for.
Power plants and substations
Fleets of step-up and grid transformers, where a 400 kV unit out of service costs more per day than its whole analysis history. HVCC used the program on 60 units in six power plants for a ten-year life-extension study.
Refineries, mines, steelworks
Populations of HV/MV and MV/LV transformers run by a small maintenance team. A 150-unit industrial fleet was set up in the program with a diagnostic plan based on DGA and oil analysis.
Own diagnostics, with technology transfer
Owners who want the diagnosis in-house. The program has been supplied with training and the creation of the fleet database, so the team keeps reading its own oil.
From the laboratory report to the maintenance decision in four steps.
Four screens, in the order a diagnostician works. Every screen below is the program on one real industrial fleet. Click any image to enlarge it.
- Step 1 of 4
The fleet and its history
- You enter
- Owners, transformers with their rated voltage, and every oil analysis with its date: gases, furans, water, breakdown voltage, tan δ, acidity, interfacial tension, physical properties. Reconditioning and reclamation events.
- You get
- One database for the whole fleet with the number of units and analyses on file, the days elapsed between samples, and a condition icon per transformer computed from its last analysis. Export for reports.
Fleet database: 4 owners, 137 transformers, 1,798 analyses - Step 2 of 4
Gas trends and levels
- You enter
- A transformer. Toggle between gas level and rate of increase.
- You get
- One chart per gas over the whole history: H2, CO, CO2, CH4, C2H6, C2H4, C2H2, TDCG, total furans, N2 and O2, with the IEC limit drawn on each, reconditioning and reclamation marked, and values below detection shown as such.
Gas results: level of each gas across the analysis history, with limits - Step 3 of 4
Fault diagnosis
- You enter
- The level rules to apply, IEC 60599 or IEEE C57.104, or your own limits. Optionally the ratios instead of the verdicts.
- You get
- For the selected analysis, Rogers and Doernenburg verdicts in words, key-gas fault type with the dominant gas, Duval triangle zone, TDCG condition with sampling interval and operating procedure, furans with DP and remaining life, OLTC contamination check, and the paper-degradation and oil-oxidation ratios.
DGA diagnosis: Rogers reads a thermal fault above 700 °C, CO at 1.9 times its limit TDCG condition, key-gas method and furans: DP 809, remaining life 93 % Duval triangle: zone D2, discharges of high energy - Step 4 of 4
Oil condition and what to do
- You enter
- The oil analyses already on file: breakdown voltage, water, particles, gas saturation, tan δ, acidity, interfacial tension, density, viscosity, colour, flash and pour point.
- You get
- Trend charts for every property, then gauges against good, attention and low bands for the selected sample, an oil-condition flag, and the verdict: reconditioning required or not, reclamation required or not. Missing analyses are named, not guessed.
Oil diagnosis: breakdown voltage 31.3 kV, low. Oil reconditioning required Oil analysis trends: breakdown voltage, water, tan δ, interfacial tension, acidity, saturation Physical properties against reference values. Reclamation not required
One industrial fleet, one transformer's verdict.
All screens come from one fleet database. These are its figures, and the diagnosis the program gave for two of its units.
- Fleet
- 4 owners·137 transformers·1,798 analyses
- History
- 2004 – 2017, up to 17 analyses per unit
- Units shown
- DGA on a 425 kV Um unit·oil on a 170 kV Um unit
- TDCG
- 1,749 ppm·condition 2·rate 0 ppm/day·quarterly sampling
- Rogers
- Thermal fault above 700 °C
- Key gas
- Overheated cellulose, CO at 92 % of combustibles
- Furans
- 54 ppb·DP 809·remaining life 93 %
- Oil
- Breakdown voltage 31.3 kV, low·water 5 ppm·reconditioning required
It comes with the engineer who reads the results.
The program is the tool behind HVCC's condition-assessment work. It is supplied inside that work, or to your team with a technology transfer.
Fleet set-up
Your transformers and the whole analysis history loaded into the database, from laboratory reports in any format.
Rules set to your fleet
IEC 60599 or IEEE C57.104 level rules, or your own limits per voltage class and transformer type.
First diagnosis together
The condition of the whole fleet reviewed with HVCC, unit by unit, with the sampling plan for the next year.
Technology transfer
Training for your maintenance team so the diagnosis stays in-house, with HVCC on call for the difficult cases.
Included in HVCC condition-assessment and life-extension contracts. Stand-alone supply with technology transfer on request.
- IEC 60599
- IEEE C57.104
- Rogers · Doernenburg
- Key gas
- Duval triangle
- TDCG level and rate
- Furans · DP · remaining life
- Breakdown voltage · water · tan δ · IFT · acidity
- Reconditioning · reclamation
Power Transformers Design
The complete design of large oil-immersed power transformers, from nameplate to clamping drawings, with FEM and transient modules.
- Nameplate, regulation, core, windings and insulation in one model
- Impedance, losses and short-circuit forces, with buckling and clamping
- Lightning and switching impulse, induced AC and partial discharges node by node
- Hot spot by IEC and FEM, and the 23-part clamping drawings
Send us one transformer's oil history.
The laboratory reports of one unit, as they are. We load them into the program and send back its diagnosis and the sampling plan, so you can judge the tool on a machine you know.
- Call
- +39 331 781 7077
- Brochure
- HVCC brochure, PDF