ABB RED615 Technical Manual page 584
615 series
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- Applications manual (116 pages) ,
- Operation manual (116 pages) ,
- Product manual (73 pages)
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Section 6
Supervision functions
578
A070972 V3 EN
Figure 310:
Incorrect connection of trip-circuit supervision
A connection of three protection IEDs with a double pole trip circuit is shown in
the following figure. Only the IED R3 has an internal TCS circuit. In order to test
the operation of the IED R2, but not to trip the circuit breaker, the upper trip
contact of the IED R2 is disconnected, as shown in the figure, while the lower
contact is still connected. When the IED R2 operates, the coil current starts to flow
through the internal resistor of the IED R3 and the resistor burns immediately. As
proven with the previous examples, both trip contacts must operate together.
Attention should also be paid for correct usage of the trip-circuit supervision while,
for example, testing the IED.
1YHT530004D05 D
615 series
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