Section 3 1MRK 500 124-UEN
HMI500
40 Operation Manual
Distributed busbar protection REB500
Signal allocation
The “Details” dialog provides facility for allocating optocoupler inputs to the
logical input signals and the event memory of every input/output.
The abbreviations C.x and O.x denote the CLOSE and OPEN auxiliary contacts on
the isolator or circuit-breaker respectively as they appear in the “Details” dialog.
Where an isolator or a circuit-breaker is only equipped with a single auxiliary
contact, the “One auxiliary contact” mode must be selected.
This mode is not recommended because the status of the isolator or circuit-breaker
cannot be properly monitored with just one auxiliary contact.
The signals are configured at the time the protection system is engineered and are
generally not changed subsequently.
Only the CLOSED signal field is visible when the “One auxiliary contact” mode is
selected. The function of the OPEN signal is achieved by inverting the CLOSED
signal. In this case, we recommend connecting the auxiliary contact supply to the
corresponding input so that its integrity is supervised.
Inversion
The signals of optocoupler inputs can also be inverted.
Configuring events
Every signal can also be saved as an event in one or more event memories (see
Section “Technical Reference Manual”)
More check boxes and input fields appear when the “Recording” radio button is
selected. They determine whether the event is recorded on the positive or negative-
going edge or on both edges. The user can enter a text (up to 32 characters)
defining the event, but if none is entered the system assigns a default event text. At
least one event memory in the “Send event to” (= save event in) field must also be
selected either in the CU and/or BU event memories. Furthermore, events can be
assigned to the event lists of IEC 60870-5-103 interbay bus (IBB) 1 or 2. As the
61850 model is implemented as defined by the standard, no custom assignments
can be made for the IBB associated with 61850.
Minimum input signal duration
Provision is made for prolonging the input signals in steps of 1 ms (reset delay).
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