ABB REX 521 Technical Reference Manual, General

Also see for REX 521: Operator's manual Technical Reference Manual, General Operating guide Technical Reference Manual, Standard Configurations Technical Reference Manual, Standard Configurations

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ABB REX 521 Technical Reference Manual, General Manual pdf 63 page image

1MRS 751108-MUM REX 52163Protection RelayTechnical Reference Manual, General9.3. Principle of the protection functions mappingThe REX 521 applications, whose modularization is based on trip stages, have beenmapped into the IEC 60870-5-103 information numbers according to the followingmodel:Fig. 9.3.-1 The principle of the protection functions mappingThe user cannot effect the event flow from the IEC 60870-5-103 protocol byadjusting the event masks of the REX 521 applications.9.4. Class 2 dataThe measurement (analog) values are transported to the control system as a responseto 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 eitherMeas 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. Thesefive profiles are supported in REX 521. In addition, there are six more private class2 ASDU frames defined. The user can choose which one of these eleven measurandsets to use. The measurand set number (1...11) can be adjusted via the Frame typeparameter.Class 2 value scalingThe IEC 60870-5-103 standard defines the scale (max. range) of the measurementsto be either 1.2 or 2.4 times the rated value for the measurement. The selectionbetween the 1.2 scaling or the 2.4 scaling can be done via the Scale factorparameter.In order that the analog (measurement) data becomes available on theIEC 60870-5-103 interface, the measurement applications must have themeasurement threshold with a proper threshold value selected. ! "#$%$&$"#$'#$#( ) *