GE Multilin F650 Digital Bay Controller 5-21
5 SETPOINTS 5.3 SYSTEM SETUP
5
5.3.3.1 BREAKER SETPOINTS
BREAKER setpointS (Setpoint > System Setup > Breaker > Breaker setpoints)
Table 5–21: BREAKER SETPOINTS
Breaker setpoints are as follows:
Number of switchgear: This is the Number of Switchgear that is configured as a breaker. It is the reference for breaker
failure (50BF), recloser (79) and synchronism (25) elements. The selected switchgear in the breaker setpoints must be
previously configured at Setpoint > Relay Configuration > Switchgear. The relay allows to configure up to 16 switchgear
elements, but the one configured as a breaker will be the reference for (KI)2t, openings and closings counters.
Maximum KI2t: This is the maximum set value for the square of current multiplied by the breaker opening time. There is a
separate counter for each phase, but the value set as maximum is a single value for the three phases.
KI2t Integration Time: This is the integration time taken as base (fixed opening time) for the calculation of KI2t.
Maximum Openings: This is the maximum number of openings allowed in the relay, with a limit of 9999; once this value is
exceeded, the relay will produce an alarm. When the limit 9999 is reached the maximum openings counter will start form
zero.
Maximum Openings in 1 hour: This is the maximum number of openings allowed in the relay during one hour; once this
value is exceeded, the corresponding alarm signal will be activated; this value is updated and reset after one hour.
Snapshot Events: This setpoint enables or disables the snapshot event generation for the breaker signals.
The interrupted current limit setpoint, fixes the Maximum breaker capacity (this value is set depending on the information
provided by the breaker manufacturer); the relay incorporates a KI2t counter for each phase, where every time a trip or
breaker opening occurs, the counter increases its value (in primary values). If the flowing current is lower than the rated
current, the relay will take the rated current value for its calculations. When the cumulate counter for each phase reaches or
exceeds the set value, the corresponding alarm signal will be activated.
The purpose of this function is to provide closer information of the current status of the breaker internal contacts, in order to
ensure appropriate breaker maintenance, and to decrease the possible risk of damage when the breaker has suffered
severe operations during a long time. Once the breaker has been operated, and the preventive maintenance is in place,
accumulated I2t values and the number of operations are reset to zero.
SETPOINT > SYSTEM SETUP > BREAKER > BREAKER SETPOINTS
setpoint Description Name Default
Value
Step Range
Number of Switchgear selected as breaker Number of Switchgear 1 1 [1 : 16]
Maximum value of KI2t Maximum KI2t 9999.99 0.01(KA)2 s [0.00 : 9999.99]
KI2t integration time KI2t Integ. Time 0.03 0.01s [0.03 : 0.25]
Maximum number of openings Maximum Openings 9999 1 [0 : 9999]
Maximum Openings in one hour Max.Openings 1 hour 40 1 [1 : 60]
Snapshot Event generation Snapshot Events ENABLED N/A [DISABLED – ENABLED]
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