EVs and induction cookers can break the low voltage grid – Technical Magazine

– The Norwegian distribution is worryingly weak, said Water Resources and Energy Director Per Sanderud on Energy Norwegian winter conference in Stockholm on Thursday.

Sanderud showed a mapping Norwegian Water Resources and Energy Directorate (NVE) has completed, indicating that it is bad to the low voltage distribution network in Norway.

Weak networks increases the risk that new electrical appliances creates tension problems, such as flicker, voltage changes, asymmetry or so-called harmonic tensions, warns NVE mapping note, that TU seen.

Devices that can cause problems in the weak grid is EVs, induction cookers, through-flow water heaters and direct starting motors heat pumps.

Half coat

In the survey asked NVE 34 grid companies to submit data, and received positive responses from 17 small and medium sized operator. These constitute about 30 percent of attachment points total in Norway.

The survey showed that approximately 50 percent of connection points in 230V IT network (see fact box) had short circuit performance lower than 1172 amperes, which is the level of the so-called reference online that electrical appliances are tested against.

Shorting performance (see fact box) shows the strength of the web.

Move network is defined to describe a network strength which should not be adverse interference voltage grid. It should represent the existing network strength in Europe, based on surveys of the network in a number of countries in Western Europe in 1980, according to the note.

The results corresponded according NVE survey that trade Energy Norway and SINTEF has previously made six grid companies.

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Expensive

NVE have not seen how much it will cost to raise the quality of the network.

With an assumption that 40 percent of 2.8 million end users in Norway has low voltage grid weaker than the reference grid, calculated Energy Norway and SINTEF a total cost of 113 billion to upgrade all low voltage grid so that the strength correspond to the reference grid.

NVE has not quality assured this calculation, and underlines the note that there is considerable uncertainty around the premise that 40 percent of end users in Norway have weak network.

But the Directorate emphasizes that there undoubtedly are talking about large sums if one is to upgrade all low voltage grid such that the net force of all connection points are just as good as the reference network.

NVE estimated in a report last year the need for investment in low-voltage distribution network in the coming ten years to 14.4 billion.

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– The Norwegian distribution is worryingly weak, said Water Resources and Energy Director Per Sanderud on Energy Norwegian winter conference in Stockholm Thursday. Photo: Øyvind Lie

Uncertainty

NVE emphasizes that it is uncertain whether the data from the 17 companies are representative of the state of Norway as a whole. The reason is that the survey is made not include data from the companies in the biggest cities, from Hafslund, BKK and Light. These are companies with a large proportion city networks, NVE assume a higher net strength than networks in more sparsely populated areas.

Another uncertainty in the data is that shorting benefits are calculated data and not measured values. The calculations assume that all capacities of all network facilities in your model matches reality, which is not secure.

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– Sensational

NVE mapping also includes status 400 V TN networks. For these connection points, the survey shows that approximately 16 percent of connection points have short circuit performance lower than the reference grid.

400 V TN systems generally newer than 230 IT network and is therefore more suited to today’s consumer. Therefore thus improve the situation in 400 TN network than on 230 V IT network.

“It is still somewhat startling that nearly 20% of the mapped 400 V TN network, a short circuit performance is lower than the reference strength, considering the assumption that this is a relatively new network, “according to the note.

Greater follow-up study

– Is it Norwegian web poorer than the average in Europe?

– There shall we say, we do not know how it is in other countries, says Sanderud to TU.

– However, it is poor in Norway?

– We will now initiate a larger study of the distribution network. Once we have received the result of it, we get the answers we need and can begin to discuss whether it should be new requirements for robustness in the network, he said.

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