wants the reservation sends a reservation request to other bays and then waits for a
reservation granted signal from the other bays. Actual position indications from these
bays are then transferred over the station bus for evaluation in the IED. After the
evaluation the operation can be executed with high security.
This functionality is realized over the station bus by means of the function blocks
QCRSV and RESIN. The application principle is shown in Figure 319.
The function block QCRSV handles the reservation. It sends out either the reservation
request to other bays or the acknowledgement if the bay has received a request from
another bay.
The other function block RESIN receives the reservation information from other bays.
The number of instances is the same as the number of involved bays (up to 60
instances are available). The received signals are either the request for reservation from
another bay or the acknowledgment from each bay respectively
, which have received a
request from this bay. Also the information of valid transmission over the station bus
must be received.
en 05000117_ansi.vsd
IED
IED
From other
SCSWI in
the bay
To other
SCSWI
in the
bay
3
Station bus
. . .
. . .
. . .
3
RESIN
EXCH_OUT
EXCH_IN
RESIN
EXCH_OUT
EXCH_IN
.
.
SCSWI
RES_RQ
RES_GRT
RES_ DATA
QCRSV
RES_RQ1
RES_RQ8
RES_ GRT1
RES_ GRT8
.
.
2
ANSI05000117 V2 EN-US
Figure 319: Application principles for reservation over the station bus
The reservation can also be realized with external wiring according to the application
example in Figure
320. This solution is realized with external auxiliary relays and extra
binary inputs and outputs in each IED, but without use of function blocks QCRSV and
RESIN.
1MRK 504 163-UUS A Section 15
Control
Transformer protection RET670 2.2 ANSI 709
Application manual
To Next Page
Loading...
Need help?
General
