Application Guide - NP900 Series
466 (504
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A996A
Figure 3.7.1.5-221 System in case when secondary circuit fault is found in phase L1
wiring.
When fault is detected and all of the conditions are met the CTS timer will start counting. If
the situation continues until the set time has been spent CTS will issue alarm.
Figure 3.7.1.5-222 System in case when primary circuit fault is found in phase L1 wiring.
Distinction in between primary and secondary fault in this case is impossible. However the
situation meets the CTS conditions and as well as in the secondary circuit fault the CTS
will issue alarm if this state continues until the set time has been spent. This means that
the CTS do not supervise only the secondary circuit but also the primary circuit.
