Saudi Arabian Grid Code May 2024

System Control 4.4.5.1 In implementing the Transmission Outage Program, in normal operation of the Transmission System, and in responding to Emergency and Fault situations on the Transmission System, the TSP may need to carry out network switching and Control Actions which may, from time to time, affect the operations of Users or Security of supply to Users. 4.4.5.2 Operational network switching may be required by the TSP for a number of purposes including the following: (i) Outages of Transmission Plant and/or Apparatus for the purposes of maintenance, new works, Operational Tests, Protection Testing, and work by Users; (ii) Outages of Transmission Plant and/or due to suspected or potential Faults and Emergency repairs; (iii) Voltage Control; or (iv) limiting Power flows on the Transmission System to levels consistent with the capabilities of the Transmission Plant and System Security. Chapter 4 - Operating Code The Saudi Arabian Grid Code Updated Version: May 2024 4.4.5.3 System switching may also occur automatically and without advance warning due to operation of Protection schemes in isolating or clearing of Faults on Transmission Plant or on User Plant which is connected to the Transmission System. 4.4.5.4 Automatic switching sequences may also be established to limit Power flows or voltage or frequency deviations in the event of Faults elsewhere on the Transmission System. 4.4.5.5 Notification to Users of Control Actions (i) The TSP will only inform the User of a Control Action on the Transmission System if the Control Action has (or expected to have) a Material Effect for the User. (ii) Where the TSP is unable to inform the Users prior to the Control Actions, then the provisions of (4.4.5.6) shall apply. (iii) Where it is identified and agreed, in accordance with the terms of the Connection Agreements and/or operating agreements, between the TSP and a User that a specific Control Action (usually an action affecting the Transmission System configuration) has an Operational Effect on a User and that there is merit in notifying the User in advance of the Control Action, then the TSP will notify the User of the Control Action (if planned and where time permits), in accordance with any standing agreement with the User. (iv) Typical examples of actions notified in accordance with (iii) above may include: (a) notification to Users of a significant reduction in supply Security to a Connection Point, where the User may arrange standby feeding arrangements at lower voltages; and/or (b) notification to a Directly-connected Customer of a significant reduction in supply Security to a Connection Point (such as the Outage of one of two Connections) where the Directly- connected Customer may arrange standby supply or run in- house Generation. 4.4.5.6 Control under Fault or Emergency Conditions (i) In the event of a System Fault or Protection operation or other automatic operation, it will not be possible to invoke standing Chapter 4 - Operating Code The Saudi Arabian Grid Code Updated Version: May 2024 procedures in accordance with (4.4.5.5) prior to the occurrence of the Control Action. (ii) In the circumstances referred to above or in the event that the TSP needs to implement Control Actions urgently and without informing Users, then unless the situation is of a temporary nature and has been rectified to normal, the TSP shall inform Users of the occurrence of the actions. (iii) The TSP shall also inform the Users as to the likely duration of the condition and shall update this prognosis as appropriate. The TSP shall additionally inform the Users when the condition no longer prevails. 4.4.5.7 De-energization of Users by the TSP (i) The TSP may have to De-energize a User's Plant and Apparatus from time to time if, and to the extent, that the TSP reasonably considers it necessary in order to provide for safe and secure operation of the Transmission System in circumstances which otherwise cause or likely to cause one or more of the following: (a) risk to the Safety of personnel; (b) risk to the Stability of the Transmission System; (c) risk to the Transmission System or any User's Plant and/or Apparatus; (d) Transmission System elements to become loaded beyond their emergency limits; (e) voltage excursions on the Transmission System outside the ranges specified in (2.4.3) of Chapter 2: Connection Code; (f) any behavior causing sustained operation outside the normal Transmission System operating frequency range; (g) any material breach of a Connection Condition; or (h) any action or inaction which places the TSP in breach of any statutory or regulatory obligation. (ii) The TSP will notify the relevant User ahead of time about the De- energization, wherever it is practicable for the TSP, to allow the User an opportunity and reasonable time to remedy/rectify the problem. In extreme situations, however, when there is an imminent threat to the Chapter 4 - Operating Code The Saudi Arabian Grid Code Updated Version: May 2024 Stability and Security of the System, the TSP will not be obliged to notify the User ahead of the De-energization.