EATON ELECTRICAL
11
Predictive Diagnostics
Figure 3
1.3.3 Data Structure
Full PD measurement by InsulGard involves a measurement of statistical Phase
Resolved Partial Discharge Distribution (PRPDD) for every active channel. After each
measurement for every active channel, InsulGard calculates PDI, Maximum PD
magnitude, PD pulse repetition rate, and trend parameters (rate of PD parameter
change). The calculated parameters are compared to alarm set points and alarm status
is determined. All calculated and alarm status parameters are stored in the internal
memory for each measurement. Additionally, three auxiliary parameters (temperature,
% of full load current and operating voltage or humidity) are assigned to the
measurement data. PRPDD can, optionally, be stored in the internal memory. There
are two modes of PD data storage “Brief” and “Full.”
Full – during this mode PRPDD is stored in the memory with the mentioned above
parameters for each active channel and every measurement.
Brief – in order to save a memory, PRPDD can be stored in the memory several times a
month. An operator should set a number of days and a measurement number at the
current day for storing PRPDD. During the remaining measurements InsulGard will
store the brief version of PD data.
