Setting Notes - Siemens SIPROTEC 7SA522 Manual

2 Functions

2.20.1.6 Setting Notes

Command Duration
2.20.2 Circuit breaker trip test
2.20.2.1 Method of Operation
344
If the device is equipped with the integrated automatic reclosure, the automatic close
commands are also counted, separately for reclosure after single-pole tripping, after
three-pole tripping as well as separately for the first reclosure cycle and other reclo-
sure 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, refer to the SIPROTEC
4 System Description, Order No. E50417-H1176-C151.
The setting of the minimum trip signal duration 70LQ 75,3 &0' (address  was
already discussed in Subsection 2.1.3. This setting applies to all protective functions
that initiate tripping.
The 7SA522 distance protection relay allows for convenient testing of the trip circuits
and the circuit breakers.
The test programs as shown in Table 2-13 are available. The single-pole tests are nat-
urally 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 via the operation panel on the front of the device or via the PC with
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DIGSI . The procedure is described in detail in the SIPROTEC
Order No. E50417-H1176-C151. Figure 2-158 shows the chronological sequence of
one TRIP–CLOSE test cycle. The timer setting values are according to Subsection
2.1.3.1 for "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 Subsection. 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.
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4 System Description,
7SA522 Manual
C53000-G1176-C155-3