Testing Of The Teleprotection System - Siemens siprotec 7SA522 User Manual

8.3.6

Testing of the Teleprotection System

8.3.6.1 Teleprotection with Distance Protection
Permissive Over-
reach Transfer,
Unblocking
7SA522 Manual
C53000-G1176-C119-2
The circuit breaker is connected manually. At the same time the timer is started. After
closing the poles of the circuit breaker, the voltage Uline appears and the timer is
stopped. The time displayed by the timer is the real circuit breaker closing time.
If the timer is not stopped due to an unfavourable closing moment, the attempt will be
repeated.
It is particularly favorable to calculate the mean from several (3 to 5) successful switch-
ing attempts.
Set the calculated time under address  as 7&% FORVH (under power system
data 2). Select the next lower adjustable value.
Start
L+
Timer
L–
Stop
Measuring the circuit breaker closing time
Figure 8-18
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.
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 
)&7 (DUWK)OW2& = 2)).
Prerequisite: 7HOHSURWHFWLRQ IRU 'LVWDQFH SURW 7HOHSURW 'LVW is
set in address  (Section 5.1) to one of the permissive overreach schemes with a
release signal, SHUPLVVLYH RYHUUHDFK or 81%/2&.,1*; furthermore, the param-
eter in address  must be set to
)&7 7HOHS () 21. Naturally, the corresponding send and receive signals must
also be assigned to the corresponding binary output and input. For the echo function,
the echo signal must be assigned separately to the transmit output.
In the case of these release schemes, a simple check of the transmission paths from
one line end is possible using the echo function. The echo function must be activated
at both line ends, i.e. address  )&7 :HDN ,QIHHG = (&+2 RQO\; with the set-
ting (&+2 DQG 75,3 a trip may result at the line end opposite to the test location!
Installation and Commissioning
Busbar
Busbar
Voltage
Close
U
Line
Feeder
8-33