Value Interpretation; Controls; Circuit Breaker Control Model; Local, Remote, Station, All And Off States - ABB RELION 615 Series Protocol Manual

1MRS759001 A
3.3.3.2
3.3.4
3.3.4.1
3.3.4.2
615 series
Communication Protocol Manual
By default, most of these objects are not in use. The predefined private function types
and information numbers for these objects can be edited freely.

Value interpretation

According to the IEC 60870-5-103 standard, the TypeID 4 value coding format is 32-
bit floating point. Since measurands in the relay are natively also mostly of this format,
no rescaling of the analog values is needed. In case the native value is of integer
format, then the relay automatically converts this into floating point for TypeID 4. The
scaling factor, seen in the measurands table, does not affect TypeID 4 objects.

Controls

The IEC 60870-5-103 standard defines remote control of indications or control of
objects without corresponding indication. Example of a controllable indication could
be circuit breaker ON/OFF whose position can be monitored as a normal ASDU 1
indication, and which also can be controlled ON or OFF by the IEC 60870-5-103
client. Example of a control object without corresponding indication could be an
acknowledge object, for example LED Reset.
According to the standard the remote control operations are performed using the
ASDU 20 object type. Controllable indications usually can be controlled into two
positions, ON or OFF. Acknowledge points can only be controlled ON. If the IED is
in local mode, the remote CB controls are rejected.

Circuit breaker control model

Circuit breaker can only be controlled with DIRECT ON/OFF commands. This is due
to the limitations in the IEC 60870-5-103 standard. In case the IED's internal (IEC
61850) circuit breaker control model is set to Select-Before-Operate, the IEC
60870-5-103 stack will internally emulate both SELECT and OPERATE commands
toward the circuit breaker. To the IEC 60870-5-103 client the control operation
always appears to be DIRECT.

Local, Remote, Station, All and Off states

The relay can be set to five different states: Local, Remote, Station, All or Off. CB
controls from an IEC 60870-5-103 client are possible when the relay is in the Remote,
Station or All state. When the relay is in the Local or Off state, the circuit breaker
cannot be controlled via IEC 60870-5-103. The IEC 60870-5-103 mapping includes
two ASDU1 ON or OFF points dealing with these states.
First, the classic Local or Remote ON or OFF indication, CTRL.LLN0. Loc, is the
easiest signal to use on the client side. The indication shows "ON" when the relay is
in the Local or Off state, and "OFF" when the relay is in the Remote, Station or All
state. Basically, this object tells if control is possible from the IEC 60870-5-103 client
at a particular moment. This object is sufficient for most users.
Vendor-specific implementation
Section 3
17