Checking The Teleprotection System With Distance Protection - Siemens siprotec 7SD5 User Manual

3 Mounting and Commissioning

3.3.11 Checking the Teleprotection System with Distance Protection

Note
If the device is intended to operate with teleprotection, all devices used for the trans-
mission of the signals must initially be commissioned according to the corresponding
instructions.
The following section applies only for the conventional transmission procedures. It is
not relevant for usage with protection data interfaces.
For the functional check of the signal transmission, the earth fault protection should be
disabled, to avoid signals from this protection influencing the tests: address 3101 FCT
EarthFltO/C = OFF.
Check for Pilot Wire The operating mode pilot wire comparison differs considerably from other teleprotec-
Comparison tion schemes as far as the type of transmission (DC closed circuit-loop) is concerned.
The examination is described in the following. If a different transmission scheme is ap-
plied, this part can be skipped.
Detailed information on the function of the pilot-wire comparison is available in Section
2.7.
For Teleprot. Dist. in address 121 Pilot wire comp must be configured and
the FCT Telep. Dis. must be switched ON under address 2101. The protection
relays at both line ends must be in operation. Initially, the quiescent current loop of the
pilot wire comparison is not yet supplied with auxiliary voltage.
A fault is simulated outside of zone Z1, but within zone Z1B. Since stage Z1B is
blocked, the distance protection is only tripped in a higher-leveled zone (usually with
T2). This check must be carried out at both line ends.
The direct voltage for the quiescent current loop of the pilot wire comparison is
switched to the line. The loop is then fed with quiescent current.
At one line end a fault is simulated outside of the first zone, but within the overreach
zone Z1B. The command is tripped to T1B. This check must be carried out at both line
ends.
Since the quiescent current loop is part of the nature of the pilot wire comparison,
these tests also check if the transmission process is performed correctly. All other
tests which are described in this Section can be passed over. However, please
observe the last margin heading „Important for All Schemes"!
Checking of The checking of the reverse interlocking is described below. If a different transmission
Reverse scheme is applied, this part can be skipped.
Interlocking
For more detailed information about the reverse interlocking see Section 2 2.7.
For Teleprot. Dist. address 121 must be set to Rev. Interlock and the FCT
Telep. Dis. must be switched ON at address 2101. The distance protection of the
infeed and switchgear of all outgoing feeders must be in operation. At the beginning
no auxiliary voltage is fed to the line for the reverse interlocking.
The following paragraphs describe the testing in a blocked state, i.e. the pickup signals
of the outgoing devices are connected in parallel and block the tested device of the
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7SD5 Manual
C53000-G1176-C169-1