Interlock for Staggered Starting of Motor Generator Sets in Multi-Processing System
Original Publication Date: 1987-May-01
Included in the Prior Art Database: 2005-Feb-01
In large multi-processing systems, each Central Electronics Complex (CEC) is supported by a Power Distribution Frame (PDF). In some installations each PDF controls a pair of Motor Generators (MGs) which are required to convert utility 50/60 Hz power to the 400 Hz power needed by the CEC power supplies. The MG control circuit sequences the pair such that the second MG starts when the first has reached normal speed. Each MG requires twice its normal running current from initial start time until half the time before normal speed is reached. The problem to be solved is to request each MG control circuit to start its sequence so that both pairs of MGs can be stagger-started to minimize utility loading, in response to varying requests to power on either or both of the CECs.