3.11.2
Binary input inversion
The parameter
Input # invert is used to invert a binary input.
Table 50: Binary input states
Control voltage
Input # invert
State of binary input
No
0
FALSE (0)
Yes
0
TRUE (1)
No
1
TRUE (1)
Yes
1
FALSE (0)
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.
3.11.3
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 parameters
Parameter
Value
Default
Input osc. level
2...50 events/s
30 events/s
Input osc. hyst
2...50 events/s
10 events/s
3.12
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.
Power output contacts are used when the current rating requirements of the
contacts are high, for example, for controlling a breaker, such as energizing the
breaker trip and closing coils.
1MRS757644 H
Basic functions
620 series
Technical Manual
113
