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Switching Statistics
The number of trips initiated by the device 7VK61 is counted. If the device is capable of single-pole tripping, a
separate counter for each circuit breaker pole is provided.
Furthermore, the interrupted current for each pole is determined during each trip command, output in the trip
log and accumulated in a memory. The maximum interrupted current is stored as well.
If the device is equipped with the integrated automatic reclosing function, the automatic close commands are
also counted, separately for reclosing after single-pole tripping, after three-pole tripping as well as separately
for the first reclosing cycle and other reclosing cycles.
The counter and memory levels are secured against loss of auxiliary voltage. They can be set to zero or to any
other initial value. For more details, please refer to the SIPROTEC 4 System Description.
2.8.1.6 Setting Notes
Trip command duration
The setting of the minimum trip signal duration TMin TRIP CMD (address 240 was already discussed in Sub-
section 2.1.3. This setting applies to all protective functions that initiate tripping.
2.8.2
Circuit breaker trip test
The 7VK61 breaker management relay allows for convenient testing of the trip circuits and the circuit breakers.
2.8.2.1 Functional Description
The test programs listed in Table 2-7 are available. The single-pole tests are naturally 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 Description. Figure 2-67 shows the chronological sequence
of one TRIP–CLOSE test cycle. The set times are those stated in Section 2.1.3.1 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 feedback of the circuit breaker position. These must be taken into consideration
when allocating the binary inputs as mentioned in the previous section.
The alarms of the device show the respective state of the test sequence.
SIPROTEC, 7VK61, Manual
C53000-G1176-C159-3, Release date 05.2009
Functions
2.8 Function Control
161
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