Diesel Generating Sets Control Cubicles

Power supply of digital switching systems asks for a primary stand by power to mains. The stand by power is usually made of high reliability diesel generating systems, since the primary stand by power has to supply the air conditioning system of the telephone exchange rooms, essential for the exchange operation. In order to achieve high reliability levels, the performances of the control and supervision cubicle are the most important. SIP, the Italian Telephone Operating Company, has specified and ITALTEL has developped a new series of diesel generating sets control and supervision cubicles for power ratings up to 1000 KVA. Dimensions of the new cubicles are 600×600×2067 (mm) and each cubicle consists of: - electronic control, and supervision device - power circuit and ancillary circuits switching, breaking and protection device - battery charger - instruments. Highlighting features of the system are: - electronic overload protection of sincronous generators from 150 up to 1000 KVA - control and supervision device for all the diesel generating set functions, operating from the strater battery of the diesel engine and therefore with a DC voltage from 8V up to 30V DC - high diagnostic capacity for the diesel generating set - possibility of manual by-pass of the cubicle - interface for information management at higher level maintenance centres, through a processor system. The paper describes the features of the diesel generating set control cubicle, of the electronic control and supervision device and the results of tests and field operation.