Producers

Installation of interconnection/homopolar protection

For self-consumption installations with a connection power of more than 250 kW, there is no exemption from installing interconnection/home-pole protection for grid connection purposes. 
In accordance with the ‘Technical Guide for Electrical Installations for the Independent Production of Electricity’ and other applicable legislation and regulations, the production installation must be equipped with protection equipment at interconnection level that can ensure fast, effective and automatic separation from the electricity distribution networks, as well as providing the function of homopolar maximum voltage protection.
 

Design elements required for technical analysis

Section 1 - Design elements for UPACs with a connection power of less than 1MW

Chapter 1.1 - General documents

General data relating to the self-consumption installation - Document containing the following information:

• Customer identification (Entity and NIF);
• Consumption CPE;
• Production CPE;
• Production Unit Registration Number assigned by the Self-Consumption Portal of the Directorate-General for Energy and Geology (DGEG);
• Production Unit Registration Number assigned by the Self-Consumption Portal of the Directorate-General for Energy and Geology (DGEG);
• Installed power of the Production Unit in kW/kVA;
• Connection power of the Production Unit in kW/kVA;

Chapter 1.2 - Protection system

• Description of the project to install the Protection Unit in the consumer installation;
• Plan identifying the location of the interconnection protection system and the energy measurement, metering and telemetering system;
• Identification plan showing the composition of the generator sets and their main characteristics;
• Single line diagram for insertion into the Public Service Electricity Network (RESP) (identification of responsibility and ownership of equipment), with identification of the connection point and IT/TT, including the transformation ratio of both.
• Schematics for the electrification of the interconnection panel (in accordance with ‘good engineering practice’), including:
             

Protection Tests

After the analysis of the documentation sent, the on-site monitoring of the interconnection protection tests of the production installation and respective regulation will be scheduled:

• Performing tests on the Voltage Transformer (TT) and Intensity Transformer (TI) primaries and respective connections
• Functional tests of the interconnection protection, settings and functions.

On-site monitoring

These tests must be carried out at a single time, but if it is not possible to reconcile them, the producer may, alternatively, present a document declaring the compliance of the primary tests, with only face-to-face monitoring by E-REDES of the functional tests.

E-REDES cannot be held responsible for any occurrences

E-REDES will not be held responsible for any occurrences and/or irregularities that may take place at the Manufacturing Plant, whether they originate from the plant or the grid, and that impact the safety of people, facilities (including the Manufacturing Plant itself) and/or property. It is the responsibility of the owner of the manufacturing plant to prove that the inverters and protections meet all the required technical conditions.

Consigning the customer's installation

If you wish to consign the customer's consumption installation to suit the self-consumption installation, you must make the request at least 7 working days in advance to the email address interrupcoes.programadas@e-redes.pt with the following information:

• Delivery point code (CPE);
• Brief description of the work to be carried out;
• Date and time intended for the cut;
• Date and time required for reconnection;
• Name and cell phone contact of the technician responsible for the work;
• If there are modifications to the private service electrical installation (under article 14 of Decree-Law 96/2017 of August 10, 2017), you must submit a provisional authorization issued by the DGEG.