This dataset presents the analysis of voltage dips on MV busbars in HV/MV substations, according to the classification table in NP EN 50160.For each monitoring point, the following information is presented:Number of voltage dips in each cell of the table, for the indicated period, excluding exceptional events and high-impact incidents in the process of classification as exceptional events.Number of voltage dips in each cell of the table, during the period of each exceptional event and high-impact incident in the process of classification as exceptional events.Polyphase aggregation (IEC 61000-4-30) and a 3-minute time interval are considered.The data are updated annually.These data result from the application of successive biannual monitoring plans for a set of selected points in the distribution network. Point selection takes into account a balanced geographic distribution, as well as the identification of customers as being more susceptible to voltage quality variations, according to the RQSSwell Voltage u (%)Duration t (ms)10 ≤ t ≤ 200200 < t ≤ 500500 < t ≤ 10001000 < t ≤ 5000500 < t ≤ 6000090 > u ≥ 80Cell A1Cell A2Cell A3Cell A4Cell A580 > u ≥ 70Cell B1Cell B2Cell B3Cell B4Cell B570 > u ≥ 40Cell C1Cell C2Cell C3Cell C4Cell C540 > u ≥ 5Cell D1Cell D2Cell  D3Cell D4Cell D55 > uCell X1Cell X2Cell X3Cell X4Cell X5The data relating to the periods of exceptional events is not yet available in Open Data.1. The information provided by E-REDES is an approximation of the values ​​related to substations and the MV network as they are extracted from the systems and are based on the time the information was collected.2. Given that the connection points, the electricity distribution network, and the consumption and production values ​​themselves are naturally very dynamic, please note that the information provided may be subject to subsequent changes and updates, and reserves the right to accept any omissions and/or occasional location inaccuracies that the information may contain.3. The information provided by E-REDES is merely an approximation of the available network capacity at any given time. Therefore, it does not constitute a contractual proposal, nor does it replace consultation with E-REDES for the purpose of formulating regular grid connection requests (PLR).4. E-REDES ensures that the information provided does not imply connection to any specific network point or asset, or even to a specific solution within the scope of the PLR ​​that may be proposed. E-REDES reserves the right to evaluate the most appropriate technical solution on a case-by-case basis, based on the respective requests, in accordance with the principles to which it is legally bound.5. E-REDES is not liable to third parties, including partners, service providers, contractors, users, and customers, for any damages that may arise directly or indirectly from the use of this Information, particularly when performing interventions, calculations, and/or estimates without confirming the accuracy and updating of the data. Therefore, it is duly noted that consulting this information does not prejudice the obligation to consult E-REDES directly for updated information.6. The information provided is, for all legal purposes, the property of E-REDES and may not be copied, reproduced, adapted, modified, altered, deleted, destroyed, disseminated, transmitted, disclosed, or otherwise made available to third parties without expressly authorizing it to do so. Any reproduction, commercialization, or transfer to third parties, even free of charge, outside the specified terms or without the express authorization of E-REDES, is prohibited under applicable law and may result in civil and criminal liability.The data provided by the E-REDES Open Data Portal is covered by open licenses (CC BY 4.0). There are no restrictions on access, provided that data users acknowledge the publisher. Therefore, we suggest citing the E-REDES Open Data Portal as:E-REDES – Electricity Distribution, "E-REDES Open Data Portal." Accessed under "Data." [Online] Available at https://e-redes.opendatasoft.com/pages/homepage/If sharing on social media, please add #PortalOpenData_E_REDES