P746/EN ST/G31 Settings
(ST) 4-
14
MiCOM P746
ST
Setting Range
Menu Text Default Setting
Min. Max.
Step Size
VTS Reset Mode Manual Manual / Auto
This setting enables the automatic or manual mode of the voltage transformer supervision
reset mode.
VTS Time Delay 5.000 s 1.000 s 10.00 s 100.0 ms
This setting determines the operating time-delay of the element upon detection of a
voltage transformer supervision condition.
CT SUPERVISION
Diff CTS Enabled Enabled / Disabled
Setting to enable or disable the differential CT Supervision. Differential CTS is based on
measurement of the ratio of I2 and I1 at each zone ends.
CTS Status Blocking Blocking / Indication
This menu enables or disables Current Transformer Supervision (CTS): when “Indication”
is selected, CTS is enabled, the following menus are accessible and settable.
CTS Time Delay 2.000 s 0.000 s 10.00 s 100.0 ms
This setting determines the operating time-delay of the element upon detection of a
current transformer supervision condition.
CTS I1 10.00 % 5.000 % 100.0 % 1.000 %
Setting for positive sequence current that is not to be exceeded in order to determine CTS
condition
CTS I2/I1>1 5.000 % 5.000 % 100.0 % 1.000 %
Setting for low set ratio that is not to be exceeded in order to determine CTS condition
CTS I2/I1>2 40.00 % 5.000 % 100.0 % 1.000 %
Setting for the high set ratio to be exceeded at exactly one end in order to determine CTS
condition
1.3 Control and support settings
The control and support settings are part of the main menu and are used to configure the
relays global configuration. It includes submenu settings as below and is discussed in more
detail below:
− Relay function configuration settings
− CT & VT ratio settings
− Reset LEDs
− Active protection setting group
− Password & language settings
− Circuit breaker control
− Communications settings
− Measurement settings
− Event & fault record settings
− User interface settings
− Commissioning settings
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