ABB Relion 670 Series Applications Manual page 326

Section 14
Control
Cause No
-25
9
5
-31
-32
-33
-34
-35
14.3.6 Reservation function (QCRSV and RESIN)
The purpose of the reservation function is primarily to transfer interlocking information between
IEDs in a safe way and to prevent double operation in a bay, switchyard part, or complete
substation.
For interlocking evaluation in a substation, the position information from switching devices, such
as circuit breakers, disconnectors and grounding switches can be required from the same bay or
from several other bays. When information is needed from other bays, it is exchanged over the
station bus between the distributed IEDs. The problem that arises, even at a high speed of
communication, is a space of time during which the information about the position of the
switching devices are uncertain. The interlocking function uses this information for evaluation,
which means that also the interlocking conditions are uncertain.
To ensure that the interlocking information is correct at the time of operation, a unique
reservation method is available in the IEDs. With this reservation method, the bay that 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 131.
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
320
Cause Description
Blocked-for-close-cmd
Blocked-by-process
Position-reached
Switch-not-start-moving
Persistent-intermediate-state
Switch-returned-to-init-pos
Switch-in-bad-state
Not-expected-final-position
The OPCAP input and output are used for the CBOpCap data of a XCBR respectively
SwOpCap for a XSWI. The interpretation for the command following is controlled
SwitchType .
through the setting
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Conditions
The BLKCLS is active indicating that the switch is
blocked for close commands.
If the Blk input is connected and active indicating
that the switch is dynamically blocked. Or if the
OPCAP input is connected, it indicates that the
operation capability of the switch is not enough to
perform the command.
Switch is already in the intended position.
Switch did not start moving within tStartMove.
The switch stopped in intermediate state for longer
than tIntermediate.
Switch returned to the initial position.
Switch is in a bad position.
Switch did not reach the expected final position.
1MRK 511 401-UUS F
M16609-3 v4
Bay control REC670
Application manual