The Principle Of The Protection Functions Mapping; Class 2 Data - ABB REX 521 Technical Reference Manual, General

1MRS 751108-MUM
11.3.
11.4.
Protection Relay
Technical Reference Manual, General

The principle of the protection functions mapping

The REX 521 applications, whose modularisation is based on trip stages, have been
mapped into the IEC 60870-5-103 information numbers according to the following
model:
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Standard
Info No
85
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The user cannot effect the event flow from the IEC 60870-5-103 protocol by
adjusting the event masks of the REX 521 applications.

Class 2 data

The measurement (analogue) values are transported to the control system as a
response to a class 2 request command. The class 2 data is always cyclically updated
(COT=2). Please refer to Table 11.5.-3 on page 55 for measurement data.
Class 2 measurand sets (ASDU frames)
The IEC 60870-5-103 standard defines the measurands to be transmitted as either
Meas I (typeId 3) or Meas II (typeId 9) ASDU frames. According to the standard,
the Meas I ASDU can have four different profiles and Meas II has one profile. These
five profiles are supported in the REX 521. In addition, there are five more private
class 2 ASDU frames defined. The user can choose which one of these eleven
measurand sets to use. The measurand set number (1...11) can be adjusted via the
"Frame type" parameter.
Class 2 value scaling
The IEC 60870-5-103 standard defines the scale (max range) of the measurements
to be either 1.2 or 2.4 times the rated value for the measurement. The selection
between the 1.2 scaling or the 2.4 scaling can be done via the "Scale factor"
parameter.
In order that the analogue (measurement) data becomes available on the
IEC 60870-5-103 interface, the measurement applications must have the
measurement threshold with a proper threshold value selected.
Start
Stage Low
>
Trip
Start
Stage High
>>
Trip
Start
Stage Inst
>>>
Trip
REX 521
Info No
General start
84*
90
Trip >
Trip >>
91
*) Interrogable
Start Stage >>
94*
Start Stage >>>
96*
Trip >>>
98
ProtMapPrin
49