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

1MRS 751108-MUM
9.3.
9.4.
Protection Relay
Technical Reference Manual, General

Principle of the protection functions mapping

The REX 521 applications, whose modularization is based on trip stages, have been
mapped into the IEC 60870-5-103 information numbers according to the following
model:
CBFP
Standard
Info No
85
CBFP
Breaker failure
CBFP
Fig. 9.3.-1 The principle of the protection functions mapping
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 (analog) 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). See Table 9.5.-3 on page 68 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 REX 521. In addition, there are six 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 analog (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
63