Logic Connections; Settings - Basler BE1-11g Instruction Manual

9424200994 Rev U
Element Blocking
The Block input provides logic-supervision control of the element. When true, the Block input disables the
element by forcing the Trip and Pickup outputs to logic 0 and resetting the element timer. Connect the
element Block input to the desired logic in BESTlogicPlus. When the element is initially selected from the
Elements view, the default condition of the Block input is a logic 0.

Logic Connections

Phase-current, differential-element logic connections are made on the BESTlogicPlus screen in
BESTCOMSPlus. The phase-current, differential-element logic block is illustrated in Figure 74. Logic
inputs and outputs are summarized in Table 43.
Name
Block
Trip
Pickup
Unrestrained Trip
2 nd Harmonic
Inhibit
th
5 Harmonic Inhibit

Settings

Tap Compensation Settings
The measured currents must be tap adjusted to eliminate magnitude mismatch prior to being used by the
Phase Current Differential Protection (87) element. The tap adjust factors can be manually calculated per
Equation 21. Or, the user can enter the MVA and kV base parameters (Table 44) and the BE1-11g will
calculate the tap-adjust factors using CT Ratio (CTR) and Compensation Factor (COMP) parameters from
the current measurement input function settings. For a transformer application, the mismatch will be at a
minimum if the actual transformer voltage ratings are used.
BE1-11g
Figure 74. Phase Current Differential Element Logic Block
Table 43. Logic Inputs and Outputs
Function
Input Disables the 87 function when true
Output True when the 87 element is in a trip condition
Output True when the 87 element is in a pickup condition
True when the 87 element is in an unrestrained trip
Output
condition
Output True when the 87 is inhibited by 2
Output True when the 87 is inhibited by 5
������������ × 1000 × ��������������������
���������������� =
√ 3 × ������������ × ����������������
Equation 21. Calculate Tap Adjust Factors
Purpose
nd
harmonic ratio
th
harmonic ratio
Phase Current Differential (87) Protection
123