GE Multilin W650 Instruction Manual page 240

5.6 INPUTS/OUTPUTS
Table 5–82: SUPERVISION WITH 52/A
There is a possibility to monitor the trip circuit and trip coil continuity. This can be done by monitoring Vdc through the
output contact when this is open.
Table 5–83: SUPERVISION ALGORITHM WITH SIMPLE VOLTAGE SUPERVISION SCHEME
STATUS OF INVOLVED ELEMENTS
CIRCUIT OUTPUT
STATUS STATUS
(F35-F36)
Healthy Open
Healthy Open
Healthy Closed
Healthy Closed
Faulty Open
Faulty Open
5
Faulty Closed
Faulty Closed
In this table, ON means that the voltage detector V52/a is active, detecting a voltage.
In the first case shown on the table, with closed breaker, voltage is detected by V 52/a sensor, and this means that there is
continuity in the supervised circuit.
As shown on Figure 5–28:, when the relay is not tripped, trip contact F35-F36 remains open. If the breaker is closed, its
auxiliary contact 52a is closed. Therefore, a little current is flowing, about 2 mA, through terminals F15 and F16 through the
voltage detector circuit, which flows through 52/a and the tripping coil 52TC (TC = tripping coil). Current will only circulate
when there is continuity in the whole circuit, so the complete circuit is monitored, and not only the trip coil. This circuit
includes auxiliary 52/a as well as the whole wiring between the battery and the relay tripping terminals, and between these
and the breaker tripping circuit.
For the second case shown on the table, open breaker, its auxiliary contact 52/a remains open, and current
cannot flow through it for detecting continuity. In order to correctly monitor the circuit, a resistor must be used,
not included in the protection, connected in parallel. The value of resistance will be selected so that the V 52/a
input circuit minimum detection current flows, but not as high as to activate the breaker-tripping coil. The figure
shows the following equation:
Where:
As shown in the second case in the table, with an open breaker, as current will flow through R if there is continuity in the
WHOLE tripping circuit, voltage will be detected in input V 52/a.
5-100
INTERNAL STATE
52 open
52 closed
TRIP
TRIP with 52 open
BREAKER
STATUS
52 closed
52 open
52 closed
52 open
52 closed
52 open
52 closed
52 open
Vmin Is the minimum voltage, in Volts, expected in the battery (e.g. 80% of Vn)
R Resistance, in kilo ohms.
2 2 mA of approximate current flowing through input V 52/a
W650 Wind Generator Protection System
V 52/A SUPERVISION
ON Ok
ON Ok
OFF Ok if t < 0.5 s
OFF Ok if t < 0.5 s
INPUT TO 650
OPERAND
CONT IP_X_CC11
(VA_COIL2)
V 52/A (F15-F16)
ON
ON
OFF
OFF
OFF
OFF
OFF
OFF
5 SETTINGS
DECISION
OPERAND
CONT IP_X_CC16
(SUP_COIL2)
ON
ON
ON (if t < 500 ms)
OFF (if t > 500 ms)
ON (if t < 500 ms)
OFF (if t > 500 ms)
OFF (500 ms delay)
OFF (500 ms delay)
OFF (500 ms delay)
OFF (500 ms delay)
GEK-113032A