1MAC050144-MB C
Section 3
Basic functions
615 series ANSI
71
Technical Manual
3.8.3
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 44:
Oscillation parameter values
3.9
Binary output
3.9.1
High-speed outputs HSO
High-speed outputs are normally used in applications which require fast IED output
contact activation time to reach fast opening of a breaker. Applications like arc protection
or breaker failure protection are example cases where fast operation is desired either to
minimize fault effects to equipment or to avoid a fault to expand to a larger area. With
high-speed outputs the total time from application to IED output contact activation is
typically 5-6 ms shorter than when using output contacts with conventional mechanical
output relays. It should be noticed that high-speed outputs also have a trade-off to reach
fast contact activation. Reset time of high-speed output contacts is typically longer than
with conventional output contacts.
3.10
RTD/mA inputs
3.10.1
Functionality
RTD and mA analog input module is used for monitoring and metering milli-ampere
(mA), temperature (°C) and resistance (
Ω
). Each input can be linearly scaled for various
applications, for example, transformer’s tap changer position indication. Each input has
independent limit value supervision and deadband supervision functions, including
warning and alarm signals.
Parameter
Values
Default
Input osc. level
2...50 events/s
50 events/s
Input osc. hyst.
2...50 events/s
10 events/s
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