Common use of Protection and Control Clause in Contracts

Protection and Control. (a) The Generator must utilise electrical protection and control systems to ensure the safety and integrity of the distribution system is not in any way compromised by the operation of the generating plant. (b) The Generator must employ electrical protection and control systems as a means of disconnecting the generating plant rapidly and automatically, in the event of: (i) a fault on the generating plant; (ii) a short circuit fault on the distribution system; (iii) a distribution system abnormality resulting in voltage or frequency outside normal operating limits at the connection point; or (iv) an interruption on the distribution system. (c) The Generator must incorporate redundant schemes into the protection system to ensure that: (i) faults are detected and automatically isolated; and (ii) the generating plant is disconnected from the distribution system in the event that a single element of the protection system has failed unless the failure meets an exception (if any) listed in Schedule 3. (d) The Generator must disconnect by opening a circuit breaker (or multiple circuit breakers) to provide a physical electrical break between the generating plant and the distribution system and: (i) the circuit breaker can either be a generator circuit breaker or the main service protection circuit breaker; and (ii) three phase generators must isolate all three phases regardless of fault type. (e) The Generator must not use automatic reclose for any fault types. (f) The Generator must ensure the generating plant protection and control systems coordinate with the distribution system protection and control systems to ensure adequate grading between the respective systems at all times unless an exception (if any) listed in Schedule 3 applies. (g) The Generator is responsible for the design, installation, setting and commissioning of all generating plant protection and control equipment. The Generator must identify all plausible fault scenarios and document, design, and implement, protection and control systems that will disconnect the generating plant from the distribution system for each of these fault scenarios. (h) The Generator must ensure that the generating plant protection and control systems comply with the document “Embedded Generator Network Access Standards – Document No UE ST 2008” (which is published on UE’s website). (i) The Generator must ensure the generating plant protection and control systems: (i) detect various faults as prescribed in the document “Embedded Generator Network Access Standards – Document No UE ST 2008” and when these faults are detected, act to disconnect the generating plant from the distribution system; and (ii) will use standard protection schemes such as inverse time over-current, under and over frequency, under and over voltage and loss of mains (such as Vector Shift and/or Rate of Change of Frequency) unless alternative methods can be demonstrated to detect all plausible fault conditions and disconnect the generating plant from the distribution system. (j) The Generator must ensure that the protection systems do not reconnect the generating plant to the distribution system until the distribution supply is fully restored. (k) The Generator will be responsible for costs associated with any modification of the distribution system protection and control systems that may be required to accommodate the generating plant. (l) The Generator must test the protection and control systems at 5 yearly intervals and otherwise at such intervals as advised by UE.

Protection and Control. (a) The Generator must utilise electrical protection and control systems to ensure the safety and integrity of the distribution system is not in any way compromised by the operation of the generating plant. (b) The Generator must employ electrical protection and control systems as a means of disconnecting the generating plant rapidly and automatically, in the event of: (i) a fault on the generating plant; (ii) a short circuit fault on the distribution system; (iii) a distribution system abnormality resulting in voltage or frequency outside normal operating limits at the connection point; or (iv) an interruption on the distribution system. (c) The Generator must incorporate redundant schemes into the protection system to ensure that: (i) faults are detected and automatically isolated; and (ii) the generating plant is disconnected from the distribution system in the event that a single element of the protection system has failed unless the failure meets an exception (if any) listed in Schedule 3. (d) The Generator must disconnect by opening a circuit breaker (or multiple circuit breakers) to provide a physical electrical break between the generating plant and the distribution system and: (i) the circuit breaker can either be a generator circuit breaker or the main service protection circuit breaker; and (ii) three phase generators must isolate all three phases regardless of fault type. (e) The Generator must not use automatic reclose for any fault types. (f) The Generator must ensure the generating plant protection and control systems coordinate with the distribution system protection and control systems to ensure adequate grading between the respective systems at all times unless an exception (if any) listed in Schedule 3 applies. (g) The Generator is responsible for the design, installation, setting and commissioning of all generating plant protection and control equipment. The Generator must identify all plausible fault scenarios and document, design, and implement, protection and control systems that will disconnect the generating plant from the distribution system for each of these fault scenarios. (h) The Generator must ensure that the generating plant protection and control systems comply with the document “Embedded Generator Network Access Standards – Document No UE ST 2008” (which is published on UE’s website). (i) The Generator must ensure the generating plant protection and control systems: (i) detect various faults as prescribed in the document “Embedded Generator Network Access Standards – Document No UE ST 2008” and when these faults are detected, act to disconnect the generating plant from the distribution system; andthe (ii) will use standard protection schemes such as inverse time over-current, under and over frequency, under and over voltage and loss of mains (such as Vector Shift and/or Rate of Change of Frequency) unless alternative methods can be demonstrated to detect all plausible fault conditions and disconnect the generating plant from the distribution system. (j) The Generator must ensure that the protection systems do not reconnect the generating plant to the distribution system until the distribution supply is fully restored. (k) The Generator will be responsible for costs associated with any modification of the distribution system protection and control systems that may be required to accommodate the generating plant. (l) The Generator must test the protection and control systems at 5 yearly intervals and otherwise at such intervals as advised by UE.