- block loading
means the maximum step active power loading of reconnected demand during system restoration after black-out;
- closed distribution system
means a distribution system classified pursuant to Article 28 of Directive 2009/72/EC as a closed distribution system by national regulatory authorities or by other competent authorities, where so provided by the Member State, which distributes electricity within a geographically confined industrial, commercial or shared services site and does not supply household customers, without prejudice to incidental use by a small number of households located within the area served by the system and with employment or similar associations with the owner of the system;
- control room
means a relevant system operator's operation centre;
- demand aggregation
means a set of demand facilities or closed distribution systems which can operate as a single facility or closed distribution system for the purposes of offering one or more demand response services;
- demand facility
means a facility which consumes electrical energy and is connected at one or more connection points to the transmission or distribution system.
- demand response active power control
means demand within a demand facility or closed distribution system that is available for modulation by the relevant system operator or relevant TSO, which results in an active power modification;
- demand response reactive power control
means reactive power or reactive power compensation devices in a demand facility or closed distribution system that are available for modulation by the relevant system operator or relevant TSO;
- demand response system frequency control
means demand within a demand facility or closed distribution system that is available for reduction or increase in response to frequency fluctuations, made by an autonomous response from the demand facility or closed distribution system to diminish these fluctuations;
- demand response transmission constraint management
means demand within a demand facility or closed distribution system that is available for modulation by the relevant system operator or relevant TSO to manage transmission constraints within the system;
- demand response unit document
(DRUD) means a document, issued either by the demand facility owner or the CDSO to the relevant system operator for demand units with demand response and connected at a voltage level above 1000 V, which confirms the compliance of the demand unit with the technical requirements set out in this Regulation and provides the necessary data and statements, including a statement of compliance.
- demand response very fast active power control
means demand within a demand facility or closed distribution system that can be modulated very fast in response to a frequency deviation, which results in a very fast active power modification;
- demand unit
means an indivisible set of installations containing equipment which can be actively controlled by a demand facility owner or by a CDSO, either individually or commonly as part of demand aggregation through a third party;
- low frequency demand disconnection
means an action where demand is disconnected during a low frequency event in order to recover the balance between demand and generation and restore system frequency to acceptable limits;
- low voltage demand disconnection
means a restoration action where demand is disconnected during a low voltage event in order to recover voltage to acceptable limits;
- main demand equipment
means at least one of the following equipment: motors, transformers, high voltage equipment at the connection point and at the process production plant;
- maximum export capability
means the maximum continuous active power that a transmission-connected demand facility or a transmission-connected distribution facility, can feed into the network at the connection point, as specified in the connection agreement or as agreed between the relevant system operator and the transmission-connected demand facility owner or transmission-connected distribution system operator respectively;
- maximum import capability
means the maximum continuous active power that a transmission-connected demand facility or a transmission-connected distribution facility can consume from the network at the connection point, as specified in the connection agreement or as agreed between the relevant system operator and the transmission-connected demand facility owner or transmission-connected distribution system operator respectively;
- on load tap changer
means a device for changing the tap of a winding, suitable for operation while the transformer is energised or on load;
- on load tap changer blocking
means an action that blocks the on load tap changer during a low voltage event in order to stop transformers from further tapping and suppressing voltages in an area;
- transmission-connected demand facility
means a demand facility which has a connection point to a transmission system;
- transmission-connected distribution facility
means a distribution system connection or the electrical plant and equipment used at the connection to the transmission system;
- transmission-connected distribution system
means a distribution system connected to a transmission system, including transmission-connected distribution facilities;