Settings - Basler BE1-11g Instruction Manual

9424200994 Rev N
Name
Block
Trip
Pickup
Unrestrained Trip
nd
2 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 13. Or, the user can enter the MVA and kV base parameters (Table 40) 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.
Parameter Description
Tapn Restraint winding
MVA MVA base
kVn kV base for CT input n
CTRn CT ratio for CT input n
Phase compensation
COMPn adjustment factor for
CT input n
The input currents can be tap adjusted up to a spread ratio of 10:1. If the ratio between TAP1 and TAP2
is greater than ten, it will be necessary to adjust the CT ratios to bring the tap factors closer together.
When the auto-tap calculation feature is used, the BE1-11g will give an error message if the spread ratio
is greater than ten.
BE1-11g
Figure 70. Phase Current Differential Element Logic Block
Table 39. 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
Output True when the 87 element is in an unrestrained trip condition
Output True when the 87 is inhibited by 2
Output True when the 87 is inhibited by 5
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�������� =
√ 3 × ������ × ��������
Equation 13. Calculate Tap Adjust Factors
Table 40. MVA and kVn Base Parameters
The BE1-11g has 2 restraint windings (2 taps).
Full load MVA or top rating of the protected equipment.
L-L Voltage in kV for each CT input circuit.
Actual ratio not effective ratio.
√3 if CTs are connected in Delta (CTcon = DAB or DAC).
1 in all other cases.
See the
Purpose
Explanation
Configuration chapter.
0BPhase Current Differential (87) Protection
nd
harmonic ratio
th
harmonic ratio
113