DC0079 OFGEM Aproval
OFGEM have recently approved a proposed update to the DC0079 Distibution Code.
The modifications made to the Distribution Code, and Engineering Recommendation G59 are in relation to ensure that all existing embedded generators make changes to comply with the following:
That where rate of change of frequency (RoCoF) protection relays are used, as part of Loss of Mains protection, the applied setting should be 1Hzs-1 with a definite time delay of 500ms.
That vector shift protection technique should be removed where it is in use as Loss of Mains protection.
That existing Loss of Mains protection settings for type-tested generators need not be changed.
Any existing over-frequency setting relays still set at 50.5Hz should if possible be reset to 52.0Hz.
Of note above is the elevation of the over-frequency trip setting from 50.5Hz to 52Hz.
For details and more information, please download the following PDF document:
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Our own DC0079 (Loss of Mains) information section can be found here.
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An up to date report on Window Two of the Accelerated Loss of Mains Change
This attached PDF contains the recent modifications made to the Distribution Code, and Engineering
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