Chapter 6. Description of Operation of Protection Subsystem
6-7
M7IRDA2003I
7IRD-A/J/M: Distribution Protection & Control Terminal
© ZIV APLICACIONES Y TECNOLOGÍA, S.L.U. 2020
6.1.2
Instantaneous Elements
The Instantaneous elements respond using two different current measuring criteria, one for
RMS values and the other for peak-to-peak values. For RMS current values, operation takes
place whenever the measured value exceeds 1.05 times the pickup setting. For peak-to-peak
current values, operation occurs whenever the difference between current samples taken 180º
apart exceeds 2.1 times the peak value of the pickup setting.
Filtering out the DC offset component in combination with the application of these two
instantaneous measurement methods results in low transient overreach without adversely
affecting tripping speed.
The combined output of these measuring elements is equipped with an adjustable timer which
enables delay of the instantaneous trip.
The actuation of the Instantaneous 2 (Phase and Ground) elements on
7IRD-J
model, inhibit
the actuation of the Recloser.
6.1.3
Overcurrent Units Block Diagrams
7IRD-A/M Model
Figure 6.4
Overcurrent Unit Block Diagram (7IRD-A/M Model).
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Страница 175: ...D List of Illustrations and Tables...