To achieve the voltage slope characteristics,
Voltage high limit
must
always be set to a value greater than
Voltage low limit
.
If
Voltage high limit
is lower than
Voltage low limit
, the voltage step
characteristic is active with
Voltage low limit
being the cutoff value.
The value of the setting
Pickup value
should always be greater than the
setting
Pickup value low
. Otherwise,
Pickup value low
is used as the
effective pickup value.
External input control mode
The External input control mode is used to enable voltage control from an external
application. If
Control mode
is set to the "Input Control" mode, the effective pickup value
for all phases is influenced by the status of the binary input
ENA_V_MULT
.
If ENA_V_MULT is TRUE:
Effective pickup value = Pickup value
e low
GUID-6FAAB486-772A-4A2D-A267-87C3778F2175 V1 EN
(Equation 7)
If ENA_V_MULT is FALSE:
Effective pickup value = Pickup valu
ue
GUID-32BD51B9-7EE5-4FCB-B576-709044E6E188 V1 EN
(Equation 8)
Voltage and input control mode
If
Control mode
is set to "Voltage and input Ctrl", both the "Voltage control" and "Input
control" modes are used. However, the “Input control” functionality is dominant over the
“Voltage control” mode when
ENA_V_MULT
is active.
No voltage dependency mode
When
Control mode
is set to "No Volt dependency", the effective pickup value has no
voltage dependency and the function acts as a normal time overcurrent function with
effective pickup value being equal to the
Pickup value
setting.
Level detector
The measured phase currents are compared phasewise to the calculated effective pickup
value. If the measured value exceeds the calculated effective pickup value, the Level
detector reports the exceeding value to the phase selection logic. If the
ENA_MULT
input
is active, the effective pickup value is multiplied by the
Pickup value Mult
setting.
Section 4
1MAC059074-MB A
Protection functions
262
615 series ANSI
Technical Manual
Summary of Contents for Relion 615 series
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