ABB Switzerland Ltd REG 316*4 1MRB520049-Uen / Rev. F
3-12
3.2.4. Tripping outputs
(see Section 5.5.4.3.)
All protection functions can directly excite the tripping relays. A
tripping logic matrix is provided for this purpose which enables
any function to be connected to any tripping channel. The trip-
ping logic matrix enables every tripping channel to be activated
by any number of protection functions.
Tripping relays are only provided on the binary I/O modules
316DB61 and 316DB62 each having 2 tripping relays with 2 con-
tacts each.
3.2.5. Measured values
(see Section 5.7.)
Apart from being processed internally, the analogue values
measured by the REG 316*4 protection functions are also avail-
able externally for:
· display:
The input variables measured by the protection functions are
available at the station control level via the communication
interface.
They can also be viewed locally on a PC (personal computer)
running the operator program or on the local display unit
(LDU) on the frontplate. Their values are referred to the sec-
ondary voltages and currents at the input of the REG 316*4
scheme.
· recording as an event:
The instant a protection function trips, the value of the corre-
sponding measured variable is recorded as an event.
3.3. Frequency range
The protection functions are designed to operate at a power
system frequency f
N
of either 50 Hz or 60 Hz. Which of the two is
applicable is a system setting. The algorithms representing the
protection functions have been optimised to produce the best
results at the rated frequency f
N
. Discrepancies from the rated
frequency cause an additional error.
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