REF 54_ Product Guide - ABB Oy Distribution Automation - #4

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Feeder Terminal REF 541, REF 543, REF 545. 1MRS750443-MBG Application The REF 541, REF 543 and REF 545 feeder terminals are designed to be used for protection, control, measurement and supervision of medium voltage networks. They can be used with different kinds of switchgear including single busbar, double busbar and duplex systems. The protection functions also support different types of networks such as isolated neutral networks, resonant-earthed networks and partially earthed networks.. Control room connection Application area also covers protection functions for a large variety of applications, e.g. frequency and voltage based protection, motor protection, thermal overload protection, capacitor bank protection and synchrocheck/voltage check function. In addition to protection, measurement, control and condition monitoring functions, the feeder terminals are provided with a large amount of PLC functions allowing several automation and sequence logic functions needed for substation automation to be integrated into one unit. The data communication properties include the following communications: SPA bus, LON bus, IEC 60870-5-103, IEC 61850, Profibus-DPV1, DNP 3.0 or Modbus communication with higher-level equipment. Further, LON communication, together with PLC functions, minimizes the need for hardwiring between the units. RER 111 LON star-coupler Optical LON bus REF 541 21 kV CB OK AROFF 1MRS xxxxxx Uaux = 80...265 Vdc/ac Ion = 1/5 A (Io) 98150 fn = 50 Hz Un = 100/110 V (U) In = 1/5 A (I) Uon = 100/110 V (Uo) 9509 REF 541 REF 541 REF 541 21 kV 21 kV CB OK CB OK AROFF AROFF AROFF CB OK 21 kV 1MRS xxxxxx Uaux = 80...265 Vdc/ac Ion = 1/5 A (Io) 98150 fn = 50 Hz Un = 100/110 V (U) In = 1/5 A (I) Uon = 100/110 V (Uo) 9509 1MRS xxxxxx Uaux = 80...265 Vdc/ac Ion = 1/5 A (Io) 98150 fn = 50 Hz Un = 100/110 V (U) In = 1/5 A (I) Uon = 100/110 V (Uo) 9509 1MRS xxxxxx Uaux = 80...265 Vdc/ac Ion = 1/5 A (Io) 98150 fn = 50 Hz Un = 100/110 V (U) In = 1/5 A (I) Uon = 100/110 V (Uo) 9509 Fig. 2 Distributed protection and control system based on REF 54_ feeder terminals. Design The feeder terminals REF 541, REF 543 and REF 545 differ from each other regarding the number of digital inputs and outputs available. Please, refer to section "Ordering" for more details. The REF 54_ feeder terminals incorporate a wide range of feeder terminal functions: · Protection functions · Measurement functions · Disturbance recorder · Power quality functions · Control functions · Fault locator · Condition monitoring functions · General functions · Communication functions · Standard functions The function blocks are documented on the CD-ROM "Technical Descriptions of Functions" (1MRS 750889-MCD). Protection functions Protection is one of the most important functions of the REF 54_ feeder terminal. The protection function blocks (e.g. NOC3Low) are independent of each other and have e.g. their own setting groups and data recording. The non-directional overcurrent protection includes e.g. the three stages NOC3Low, NOC3High and NOC3Inst, each with independent protection functions. Either Rogowski coils or conventional current transformers can be used for protection functions based on current measurement. Correspondingly, voltage dividers or voltage transformers are used for protection functions based on voltage measurement For further information about functionality levels and the protection functions included in them, refer to the table "Functionality levels, protection functions" in section "Ordering". Measurement functions The measurement functions include threephase currents, neutral current, three-phase voltages, residual voltage, frequency, active 4