ABB Relion RES670, Technical Manual

Page: 79 / 934

Section 4 Binary input and output modules
4.1 Binary input
4.1.1 Binary input debounce filter
GUID-AE43976C-E966-484C-AF39-89B2B12F56DC v5
The debounce filter eliminates bounces and short disturbances on a binary input.
A time counter is used for filtering. The time counter is increased once in a millisecond
when a binary input is high, or decreased when a binary input is low. A new debounced
binary input signal is forwarded when the time counter reaches the set
DebounceTime
value and the debounced input value is high or when the time counter reaches 0 and the
debounced input value is low. The default setting of
DebounceTime is 1 ms.
The binary input ON-event gets the time stamp of the first rising edge, after which the
counter does not reach 0 again. The same happens when the signal goes down to 0
again.
4.1.2 Oscillation filter
GUID-41B89E6F-50C3-44BF-9171-3CC82EB5CA15 v4
Binary input wiring can be very long in substations and there are electromagnetic fields
from for example nearby breakers. An oscillation filter is used to reduce the
disturbance from the system when a binary input starts oscillating.
An oscillation counter counts the debounced signal state changes during 1 s. If the
counter value is greater than the set value
OscBlock , the input signal is blocked. The
input signal is ignored until the oscillation counter value during 1 s is below the set
value
OscRelease .
4.1.3 Settings
GUID-07348953-4A72-444B-A31A-030ABEA8E0C4 v1
OscBlock must always be set to a value greater than OscRelease . If this
is not done, oscillation detection will not function correctly, and the
resulting behaviour will be undefined.
1MRK 511 408-UUS A
Section 4
Binary input and output modules
Phasor measurement unit RES670 2.2 ANSI 73
Technical manual