Siemens SIPROTEC 4 7SD80 Manual Download

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NOTE

If parameters were changed for this test, they must be returned to their original state after completion of
the test !

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 current/
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 Measured Values Constellation

Constellation measured values.

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 gener-
ated 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)

address

Direct Trip(DT)

. 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.

Checking 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.).

Trip and Close Test with the Circuit Breaker

The circuit breaker and tripping circuits can be conveniently tested by the device 7SD80.
The procedure is described in detail in the SIPROTEC 4 System Description.
If the check does not produce the expected results, the cause may be established from the text in the display
of the device or the PC. If necessary, the connections of the circuit breaker auxiliary contacts must be checked:
It must be noted that the binary inputs used for the circuit breaker auxiliary contacts must be assigned sepa-
rately for the CB test. This means it is not sufficient that the auxiliary contacts are allocated to the binary
inputs FNo. 351 to 353, 379 and/or 380 (according to the possibilities of the auxiliary contacts); additionally,
the corresponding FNo. 366 to 368 or 410 and/or 411 must be allocated (according to the possibilities of the
auxiliary contacts. In the CB test only the latter ones are analyzed. See also Section

Siemens SIPROTEC 4 7SD80, Manual

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