GEK-113285A G650 Generator Protection & Control System 5-113
5 SETTINGS 5.6 INPUTS/OUTPUTS
5
c) WITH CURRENT SUPERVISION (WITH SEAL-IN)
In this case, as shown in Figure 5–31:, the current supervision circuit consists of a circuit connected in series with the
output contact, so that the external circuit is wired to terminals F34 and F36. This supervision circuit includes a low
impedance reed relay that is activated when the current value exceeds 200 mA, and sends a signal to the main
microprocessor. This will latch the output relay in such a way that this indication can be used to produce a latching of the
output relay, so that it will remain closed while the circulating current is over 200 mA. To use the seal-in feature in the relay
it is not necessary to configure any setting. It works, we only must program the corresponding Circuit latching setting wiring
the external circuit to terminals F34 and F36.
With this scheme, in the case of a failure to open from the breaker auxiliary contact, the G650 output relay will not be the
one to open the tripping coil current, as in this case the contact may result damaged, as it is prepared for opening currents
around 0.35 A at 125 Vdc. This latching or memory function is only guaranteed while the element is powered.
Figure 5–31: CURRENT SUPERVISION OF THE TRIPPING CONTACT (A6631F2)
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