The maintenance of our network infrastructure is based on the grid asset maintenance model. The model is a set of overriding principles that govern the process of grid asset maintenance in the area of organisation, planning, execution, documentation and billing of maintenance work.
It defines the scopes of work and the rules for the performance of work with reference to laws and regulations as well as statutory obligations imposed on the transmission system operator. Hence it creates conditions for the systematic execution of the optimisation process with regard to the maintenance of grid assets.
Arising directly from the maintenance model are detailed rules for equipment maintenance put together in the Instruction on the Organisation and Execution of Maintenance Work on EHV Lines and Substations, as well as the guidelines on the assessment of the state of repair and the Repair Qualification Model.
We have updated the asset maintenance model based on our previous experience. We have opted out of the Time-Based Maintenance (TBM) process which is based on fixed work cycles resulting directly from O&M manuals of individual equipment units. The new asset maintenance model falls in line with the Reliability Centred Maintenance (RCM) model – it combines regular measurements of the state of repair taking into account expected quality outcomes of their work (diagnostics results). The main focus is placed on diagnostic work providing a basis for a measurable result of the state of repair of individual pieces of network equipment.
The outcomes of the work concerned, combined with the experience gained through many years of maintenance of equipment make it possible to assess the state of repair of equipment units and forecast the rate of their deterioration, and consequently to identify the impact of maintenance (inspections, maintenance procedures) on the condition of such equipment in the future. At the same time, the maintenance model makes it possible to forecast the cost of maintenance of individual equipment units throughout their service life.
In the network maintenance process, we use the Asset Management IT process. It covers the entire maintenance process, i.e. a complex database of assets, registration of events, work planning and execution, contract management and warehouse management.
What is more, the maintenance process is supported by the following systems
- The remote supervision and control system (SSiN) providing data on network parameters and the state of repair of individual network elements.
- Spatial Information System.
Advantages arising from the use of the systems presented
- The ability to control the life cycle of individual network elements.
- Current information on the location of network elements and their environment in terms of infrastructure and ownership.
- Adjustment of the organisation of grid asset management at strategic and operational level to a complete, fully functional system of remote monitoring, supervision and control of transmission system operation without permanent substation operation personnel.
Implementing new diagnostic methods, gradual digitisation of the grid asset maintenance process, and a high and continuously developed competence level of personnel performing maintenance tasks, we seek – in accordance with the lean management concept – to achieve an even greater operational dependability of network elements.