GE Multilin G650, Manual

Page: 261 / 639

5-118 G650 Generator Protection & Control System GEK-113285A
5.6 INPUTS/OUTPUTS 5 SETTINGS
5
Table 5–108: SUPERVISION ALGORITHM WITH DOUBLE VOLTAGE SUPERVISION SCHEME
There is a possibility to monitor the trip circuit continuity not only via its auxiliary contact 52/a, but also with auxiliary contact
52/b. This avoids the need to install a resistance in parallel with auxiliary 52/a. The correct connection is shown on Figure
5–34:
The circuit works in a similar way to the one described in the previous section, but it uses both supervision inputs F15-F16
and F17-F18.
The advantage in this case is that circuit supervision with 52 open is more complete, as input V 52/b is used through
contact 52/b, (that is closed when the breaker is open).
We must point out that in this scheme, the tripping contact, shown in the example as the G650 trip relay, can be the one in
the relay (terminals F35 and F36), or be provided by another protection or by the parallel of several protections. This
provides high flexibility in the use of this circuit.
The battery voltage can also be monitored, by using one of the standard digital inputs.
STATUS OF INVOLVED ELEMENTS INPUTS TO 650 DECISION
CIRCUIT
STATUS OUTPUT
STATUS
(F35-F36) BREAKER STATUS OPERAND
CONT IP_X_CC11
(VA_COIL2)
V 52/A (F15-F16) OPERAND
CONT IP_X_CC12
(VB_COIL2)
V 52/B (F17-F18) OPERAND
CONT IP_X_CC16
(SUP_COIL2)
Healthy Open 52 closed ON OFF ON
Healthy Open 52 open ON ON ON
Healthy Closed 52 closed OFF OFF ON (if t < 500 ms)
OFF (if t > 500 ms)
Healthy Closed 52 open OFF ON ON (if t < 500 ms)
OFF (if t > 500 ms)
Defective Open 52 closed OFF OFF OFF (500 ms delay)
Defective Open 52 open OFF OFF OFF (500 ms delay)
Defective Closed 52 closed OFF OFF OFF (500 ms delay)
Defective Closed 52 open OFF OFF OFF (500 ms delay)