Settings P54x/EN ST/La4
MiCOM P543, P544, P545, P546
(ST) 4-23
ST
Setting range
Menu text Default setting
Min. Max.
Step size
Phase TMS 1 0.025 1.2 0.005
Setting for the time multiplier setting to adjust the operating time of the IEC IDMT
characteristic.
Phase Time Dial 0.01 0.01 100 0.01
Setting for the time multiplier setting to adjust the operating time of the IEEE/US IDMT
curves. The Time Dial (TD) is a multiplier on the standard curve equation, in order to
achieve the required tripping time. The reference curve is based on TD = 1.
Care: Certain manufacturer's use a mid-range value of TD = 5 or 7, so it may be
necessary to divide by 5 or 7 to achieve parity.
PIT Time 0.2 s 0 s 0.2 s 0.005 s
This timer is initiated upon receipt of PIT flag in the message. Once this timer elapses, and
as long as the current is above of Is1 setting, the relay closes its three phase differential
trip contacts.
Ph CT Corr'tion 1 1 8 0.01
Setting used to compensate CT ratios mismatch between terminals.
Compensation None None, Cap Charging, Vector group
Setting to define type of compensation.
If set to None, Susceptance Inrush Restraint, Id High Set and Vectorial Comp are
invisible.
If set to Cap Charging, Susceptance setting becomes visible and Inrush Restraint, Id
High Set and Vectorial Comp are invisible.
If set to Vector group, Inrush Restraint, Id High Set and Vectorial Comp settings
become visible while Susceptance setting is invisible.
Inrush Restraint, Id High Set and Vectorial Comp are only applicable in relay models
P543 and P545.
Susceptance 1E-8*In 1E-8*In 10*In 1E-8*In
Visible when Compensation is set to Cap Charging. Setting to define the positive
sequence susceptance value of the circuit for capacitive charging current compensation
Inrush Restraint Disabled Enabled or Disabled
Only models P543 and P545 when Compensation is set to Vector group. To enable
(activate) or disable (turn off) the additional bias inrush restrain. When set to enable “Id
High Set” becomes visible.
Note: It must be ensure that this function is enabling at each end to avoid
maloperation.
Id High Set 4*ln 4*ln 32*ln 0.01*ln
Only in models P543 and P545 when Inrush Restraint is enable. Pick-up setting for high
set differential protection
Vectorial Comp Yy0 (0 deg)
Yy0 (0 deg), Yd1 (-30 deg), Yy2 (-60 deg),
Yd3 (-90 deg), Yy4 (-120 deg),
Yd5 (-150 deg), Yy6 (180 deg),
Yd7 (+150 deg), Yy8 (+120 deg),
Yd9 (+90 deg), Yy10 (+60 deg),
Yd11 (+30 deg), Ydy0 (0 deg),
Ydy6 (180 deg)
Only in models P543 and P545 when Vectorial Comp is enable. To define the vector
compensation to account for phase shift correction and zero sequence current filtering (for
transformer applications)
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