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2 Functions
Figure 2-103
Breaker tripping alarm suppression — sequence examples
2.16.2 Circuit Breaker Test
The 7SD610 line protection relay allows for convenient testing of the trip circuits and
the circuit breakers.
2.16.2.1 Functional Description
The test programs listed in Table 2-10 are available. The single-pole tests are natu-
rally only available if the device at hand allows for single-pole tripping.
The output alarms mentioned must be allocated to the relevant command relays that
are used for controlling the circuit breaker coils.
The test is started using the operator panel on the front of the device or using the PC
with DIGSI. The procedure is described in detail in the SIPROTEC 4 System Descrip-
tion. Figure 2-104 shows the chronological sequence of one TRIP–CLOSE test cycle.
The set times are those stated in Section 2.1.2.1 for „Trip Command Duration" and
„Circuit Breaker Test".
Where the circuit breaker auxiliary contacts indicate the status of the circuit breaker or
of its poles to the device via binary inputs, the test cycle can only be initiated if the
circuit breaker is closed.
The information regarding the position of the circuit breakers is not automatically
derived from the position logic according to the above section. For the circuit breaker
test function (auto recloser) there are separate binary inputs for the switching status
234
7SD610 Manual
C53000-G1176-C145-4
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