e-mail: (Comm.le ltalia)[email protected] e-mail: (Sales Dept.) [email protected] Analysisof. the.Ste^ Load Applied. The purpose of this document is to show the ability of the JUPITER instrument to analyse the start up transient of a genset and of the subsequent application of the load. JUPITER is a complete analysis recording measurement system, capable of measuring and memorising the functioning parameters of an electrical system. As well the display in real time on the integrated screen the recorded data can be viewed and analysed with our PC software called PQ Studio manager In this application, the measurement is set for the analysis of electrical transients during the functioning of a generator set, the system has been programmed for recording on the internal memory the instantaneous numerical values of the three voltages and of the three large currents which occur on the network, with an recording interval of 310 micro seconds. In this way is possible to reconstruct in a very detailed way the changeing electrical parameters of the system allowing the exact reconstruction of each situation, which is not recordable with standard equipment, even of the last generation. In this setup mode, the JUPITER in the standard combination will record up to 3 The following are some of the pages available in a graphic and numerical format which the JUPITER-PQ Studio provides in an actual case of measurements made on an isolated genset. In the selected example the instantaneous values of the three voltage between the phases or the The pages also show the real wave forms, which show the fast events and give an overview of the electrical supply system, Start up transient and generating voltage. ■ ■■■■■■■■■ ■■■■■■■■■■■■■■■■■■■■■■■■ ■ ■■■■■■■■■■■■■ M^Jm ■■■■■■ ■■ ■ m^m m m The PQ Software Studio can display the path of all the recorded parameters, in the example case the instantaneous values of the three phases are shown between the phases and the neutral during the start up period (the voltage between the phases is also available). The cursor allow the display of the exact value at the selected point; the time scale is programmable, with full scale from 50ms to 500ms ( as in the figure); the full scale is programmable for each parameter (in the case of the voltage , with full scale from 50V to 2kV)

Load Application. For evaluating the effect of the applied load, the display can show both current and voltage on the same graph; in this way it the effect of a very variable current is very clear, with a phase angle different from the voltage which must support it, which includes the system and the generator. In the example, you can see how the voltage supplied by the gen set varies from a true RMS value of 239V to a value of 156V in the range of 8 periods ( 160 millisecond), for a load of 170Kva. With the same graphs it is possible to quantify the frequency of the supply in each period, for...