Mounting and Commissioning
3.3 Commissioning
SIPROTEC, 7SD80, Manual
E50417-G1140-C474-A1, Release date 09.2011
277
3.3.9 Checking the Instrument Transformer Connections of Two Line Ends
Measured Values Constellation
The constellation measured values enable you to also check the transformers at the opposite end. The cur-
rent/voltage measured locally is assumed as reference value for the angle. The angle values of the remote
ends are referred to the locally measured value.
Examples for the current in a constellation with 2 ends:
Current IA at the local end 98 % angle 0°
Current IA at the opposite end 98 % angle 180° (max. +/- 10° depending on the capacitive charging current and
the power flow)
For more information, see the Section 2.17.5 Constellation measured values.
3.3.10 Checking the Pilot Protection for Internal and External Remote Tripping
The 7SD80 provides the possibility to transmit a remote trip signal to the opposite line end if a signal transmis-
sion path is available for this purpose. This remote trip signal may be derived from both an internally generated
trip signal as well as from any signal coming from an external protection or control device.
If an internal signal is used, the initiation of the transmitter must be checked. If the signal transmission path is
the same and has already been checked as part of the previous sections, it does not need to be checked again
here. Otherwise the initiating event is simulated and the response of the circuit breaker at the opposite line end
is verified.
For remote transmission, the external command input is employed on the receiving line end; it is therefore a
prerequisite that: DTT Direct Trip is set to Enabled in address 122 and Direct Trip(DT) to ON at
address 2201. If the signal transmission path is the same and has already been checked as part of the previous
subsections, it needs not be checked again here. A function check is sufficient, whereby the externally derived
command is executed. For this purpose the external tripping event is simulated and the response of the circuit
breaker at the opposite line end is verified.
3.3.11 Testing User-defined Functions
The device has a vast capability for allowing functions to be defined by the user, especially with the CFC logic.
Any special function or logic added to the device must be checked.
Naturally, general test procedures cannot be given. Rather, the configuration of these user defined functions
and the necessary associated conditions must be known and verified. Of particular importance are possible
interlocking conditions of the switchgear (circuit breakers, isolators, etc.).
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