Regulator. The output of this function is connected in such a way as to transfer the digital regulator from AC to DC regulation when its potential intelligence is lost. -------------------------------------------------------------------------------- Proprietary Information Page 11 AES IRONWOOD CONTRACT FINAL ISSUE - OCTOBER 30, 1998 -------------------------------------------------------------------------------- If a voltage regulator loses its potential intelligence signal, then the regulator will drive the excitation of the generator to ceiling. Protection for loss of potential intelligence to a regulator is desired for faults within the potential intelligence circuits themselves. Protective operations are not desired for voltage disturbances caused by external faults or for loss of voltage from causes other than those within the potential sources. Note that under a line fault condition, it is desirable to have the regulator boost excitation; it would be undesirable to have the loss of sensing voltage detector function operate on this condition as a loss of potential signal and transfer the regulator. Because of this, it is necessary to discriminate between conditions of faulty voltages created within the potential measuring circuits themselves and complete or partial loss of voltage resulting from causes external to the potential measuring equipment. To accomplish the necessary discrimination, the loss of sensing protective module requires a three-phase potential signal from the regulator potential transformers plus an additional three-phase potential signal from another set of potential transformers that monitor the same machine (such as the metering potential transformers).
Appears in 3 contracts
Sources: Engineering, Procurement and Construction Services Agreement (Aes Ironwood LLC), Engineering, Procurement and Construction Services Agreement (Aes Ironwood LLC), Engineering, Procurement and Construction Services Agreement (Aes Ironwood LLC)