Netze BW has been experimenting with next generation technologies in its inspections and maintenance planning across its extensive network of distribution infrastructure
Over the summer of 2020, German distribution system operator, Netze BW, has worked with Sharper Shape to explore a new approach to grid asset inspection, combining AI with drone-based data collection. Modern Power Systems magazine takes a closer look.
Netze BW is the largest distribution system operator (DSO) in Baden-Württemberg – itself the third-largest Land (or state) in Germany – responsible for high, medium and low-voltage networks across the state. Its power lines stretch over 100,000km (62,000 miles) and, like all power utilities, it faces a constant challenge of monitoring, inspecting and maintaining the network.
Without rigorous asset inspection, the utility cannot ensure a stable, secure and safe supply to customers. However, detailed inspection over such a large, disparate area is extremely resource intensive, which creates a tension with the need to control operational costs.
Historically, Netze BW has struck a workable balance in this respect, however, the times are changing for DSOs.
The challenge: Radical change in the network
The traditional approach to inspection has been to deploy teams of engineers to manually inspect assets, travelling around the state and climbing utility poles – a job not without danger. This process has been expensive but workable.
However, the landscape for DSOs is changing rapidly. For one thing, the renewable revolution is well underway, which means far more small-to-medium sized distributed energy assets (DERs) are connected at the distribution level.
This turns the traditional topography of the grid on its head: power generation was almost exclusively large, centralised and connected to the higher-voltage transmission network, which then transported power to the various distribution networks. Now, DSOs are seeing increasing DERs (solar panels, small wind turbines, electric vehicle chargers etc) connect directly to their networks – a growing trend which puts extra strain on the grid and therefore heightens the need for detailed, widespread inspection.
At the same time, utilities are looking to digitalise and decentralise to facilitate better, faster fact-based decision-making in response to this new operating environment.
Mario Gnädig, project manager at Netze BW describes the ongoing challenge of “carrying transformation within the company down to the very last part of its decentralised organisational structure, taking all employees with them”.
“In Germany,” he adds, “as in many other countries, we are experiencing a radical change in the distribution network, which is largely due to the energy revolution. The days of long planning horizons are over, and we must be able to react ever faster to changes in the grid and connected prosumers. This is not only a technical challenge, but also fundamentally revolutionises the way employees work.”
The solution: A new approach to asset inspection
Over the summer of 2020, Netze BW embarked on a pilot project with Sharper Shape, a company taking a digital-first approach to asset inspection that promised to greatly improve inspection efficiency and contribute to the utility’s broader digitalisation plans.
Stage One was in-field aerial inspection using drones equipped with high definition cameras. By using drone photography, not only is it much quicker to capture information about a given pylon than sending a human up a ladder, it also reduces personnel risk by keeping them on the ground and made light work of inspecting previously-inaccessible locations.
Gnädig commented: “We were impressed by the ease with which we could use the drone flight planning software to fly a drone largely independently around the high-voltage pylons and to automatically generate and visualise images of the objects on the pylon without extensive pilot knowledge.”
Simply by introducing drone-based data collection, inspection teams immediately gained the ability to cover much more of the network in a given timeframe, easing the burden considerably. However, the bulk of the value in Sharper Shape’s system was in the software platform used to analyse the captured data, Sharper CORE.
The system automatically takes the data and applies artificial intelligence (AI) and machine learning algorithms to plan and prioritise maintenance and future inspection in order to make most efficient use of resources, as well as aiding wider digitalisation efforts by mapping and standardising data across the network.
The result: A more digital, more high-definition grid
For Gnädig, there were clear criteria for judging whether the project would be counted as a success: “First and foremost, we want to use modern technology to provide support for our colleagues in the field. It’s extremely important not to increase their workload with another tool, but to create real simplification. To achieve this, we strive for a high degree of digitalisation and automation.”
The software allowed easy, intuitive navigation between inspection objects, with data formatted to be standardised so that it is easily shareable with other departments within the utility in future. Users benefitted from advanced data visualisation within the platform that gave context and made the data understandable, helping to increase efficiency and reduce errors.
Gnädig sees value in expanding the approach throughout Netze BW’s network: “A company-wide rollout would mean higher safety standards in our operations as well as a high degree of standardisation of documentation and data quality – something that has typically been difficult across our different grid regions.
“In addition, the improved data availability would enable more complex analytics topics such as dynamic inspection intervals, error dependencies on other parameters such as weather, and better information situation on each site for crews.”
Digitalisation takes many forms across a distribution grid. But data gathering via advanced asset inspection techniques can both revolutionise power line inspection regimes themselves and bleed into other departments to add value throughout the organisation – for example in grid planning or emergency response.
Tying this all together with powerful software and analytic technology is the key to making the most of the data and ensuring that tools – as Gnädig stipulates – make employees’ lives easier and processes better, rather than adding another layer of complexity.
In fact, he sees a future where, “AI is essential when it comes to discovering complex and unmanageable connections from different sources. AI will not be an end in itself – it will not abolish jobs – but AI will help us to work even better and will be our tool to handle unimaginably large amounts of data. We will leave the hype behind and use it as naturally as a calculator or a pencil.”
This article first appeared in Modern Power Systems magazine