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Technical Reference Manual, General
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The main releases of the REF 54_ products are differentiated with the software
revision letter in the order number of the feeder terminal and the corresponding
software number, both of which are printed on the marking strip on the front panel
of the feeder terminal, for example as follows:
Order No: REF543*C127AAAA
Software No: 1MRS110028-001
The revision letter determines the main release which may involve functional
additions and changes to the product. The changes included in each revision
compared to the previous one are described in more detail below.
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• Additional scaling factor for setting the rated current/voltage of the protected unit
(separate scaling factor for channels 1...10). For further information refer to
section “Scaling the rated values of the protected unit for analogue channels” on
page 33.
• Technical data of the VT1, VT2, VT3 and VT4 voltage transformers; range of the
adjustable rated voltage for primary current transformers is 0...440 kV instead of
the earlier 0...150 kV.
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REF 541 A 1MRS110000-001 Release 1.0 (June 1998)
B 1MRS110007-001 Release 1.5 (Dec 1998)
C 1MRS110013-00_ Release 2.0 (May 2000)
D 1MRS110026-0__ Release 2.5 (June 2003)
REF 541 (RTD1) A 1MRS110014-00_ Release 2.0 (May 2000)
B 1MRS110027-0__ Release 2.5 (June 2003)
REF 543 C and D 1MRS110001-001 Release 1.0 (June 1998)
E 1MRS110008-001 Release 1.5 (Dec 1998)
F 1MRS110015-00_ Release 2.0 (May 2000)
G 1MRS110028-0__ Release 2.5 (June 2003)
REF 543 (RTD1) A 1MRS110016-00_ Release 2.0 (May 2000)
B 1MRS110029-0__ Release 2.5 (June 2003)
REF 545 A 1MRS110002-001 Release 1.0 (June 1998)
B 1MRS110009-001 Release 1.5 (Dec 1998)
C 1MRS110017-00_ Release 2.0 (May 2000)
D 1MRS110030-0__ Release 2.5 (June 2003)
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