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12.3.11 f Sig
Immediate signaling relay – frequency; closes immediately in case of frequency failure (over or under
frequency). The relay opens in case that all parameters are back within limits, but no sooner than after Basic:
Imp Len from its activation. If the relay is closed during trip activation, it opens no sooner than
(page 55)
since trip status activation. Fault reset has no influence on this output. If any frequency protection is
disabled by setpoint (limit set to 0), the output does not signal activation of this protection stage.
6 back to Relay outputs
12.3.12 !f Sig
Inverse immediate signaling relay – frequency; opens immediately in case of frequency failure (over or under
frequency). The relay closes in case that all parameters are back within limits, but no sooner than after
Len [s] (page 55)
from its activation. If the relay is open during trip activation, it closes no sooner than Basic:
Imp Len since trip status activation. Fault reset has no influence on this output. If any frequency protection is
disabled by setpoint (limit set to 0), the output does not signal activation of this protection stage.
6 back to Relay outputs
12.3.13 LOM Sig
Immediate signaling relay – loss of mains; closes immediately in case of loss of mains failure (Vector shift or
ROCOF). The relay opens
activation. Fault reset has no influence on this output. If any LOM protection is disabled by setpoint (limit set to
0), the output does not signal activation of this protection stage.
6 back to Relay outputs
12.3.14 !LOM Sig
Inverse immediate signaling relay – loss of mains; opens immediately in case of loss of mains failure (Vector
shift or ROCOF). The relay closes after
protection activation. Fault reset has no influence on this output. If any LOM protection is disabled by setpoint
(limit set to 0), the output does not signal activation of this protection stage.
6 back to Relay outputs
12.3.15 dU Sig
Immediate signaling relay – asymmetry; closes immediately in case of voltage (amplitude) unbalance,
positive sequence undervoltage, negative sequence overvoltage, or failure (over or under frequency). The
relay opens in case that all three evaluation methods of voltage asymmetry are in fail-free state, but no sooner
than after
Imp Len [s] (page 55)
sooner than Basic: Imp Len since trip status activation. Fault reset has no influence on this output. If any
asymmetry protection is disabled by setpoint (limit set to 0), the output does not signal activation of this
protection stage.
6 back to Relay outputs
MainsPro G99TT 1.0.0 Global Guide
afterLOM Trp Del, A.LOM Trp Del [s] (page 61)
LOM Trp Del, A.LOM Trp Del [s] (page 61)
from its activation. If the relay is closed during trip activation, it opens no
Imp Len [s]
since the last LOM protection
since the last LOM
Imp
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