Page 26 - Basic PD Theory
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PD Data Types
Figure 20: Location of SSCs
3.2 Termination Box
The coaxial cables from the EMCs and the twisted pair cables from the SSCs are routed from the sensors through the
generator housing to a conventionally mounted termination box [Figure 21]. The cables are permanently secured to the
back of the panel in the termination box as shown in Figure 22. Within the termination box are protection spark gaps
and resistors to enhance the collection of PD data. For further information regarding the termination box please refer
to the appropriate Iris Sensor Installation Guide.
Figure 21: Termination Box Figure 22: Inside Termination Box
3.3 Data Collection
Iris instruments fall into two major categories: Portable and
Continuous. Portable instruments are temporarily connected to
the sensors and require user-intervention to collect PD data.
Continuous systems, Guards and Tracs, are permanently
connected to the sensors and provide both alarming capabilities
and scheduled collection of PD data.
Figure 23: Portable Instrument (PDA-IV)
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