Oscillation Suppression; Binary Outputs - ABB 615 series Technical Manual

1MAC059074-MB A
3.11.3
3.12
615 series ANSI
Technical Manual
Table 50: Binary input states
Control voltage
No
Yes
No
Yes
When a binary input is inverted, the state of the input is TRUE (1) when no control voltage
is applied to its terminals. Accordingly, the input state is FALSE (0) when a control
voltage is applied to the terminals of the binary input.

Oscillation suppression

Oscillation suppression is used to reduce the load from the system when a binary input
starts oscillating. A binary input is regarded as oscillating if the number of valid state
changes (= number of events after filtering) during one second is equal to or greater than
the set oscillation level value. During oscillation, the binary input is blocked (the status is
invalid) and an event is generated. The state of the input will not change when it is blocked,
that is, its state depends on the condition before blocking.
The binary input is regarded as non-oscillating if the number of valid state changes during
one second is less than the set oscillation level value minus the set oscillation hysteresis
value. Note that the oscillation hysteresis must be set lower than the oscillation level to
enable the input to be restored from oscillation. When the input returns to a non-oscillating
state, the binary input is deblocked (the status is valid) and an event is generated.
Table 51: Oscillation parameter values
Parameter
Input osc. level
Input osc. hyst

Binary outputs

The protection relay provides a number of binary outputs used for tripping, executing
local or remote control actions of a breaker or a disconnector, and for connecting the
protection relay to external annunciation equipment for indicating, signalling and
recording.
Input # invert
0
0
1
1
Values
2...50 events/s
2...50 events/s
Section 3
Basic functions
State of binary input
FALSE (0)
TRUE (1)
TRUE (1)
FALSE (0)
Default
30 events/s
10 events/s
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