Basler BE1-11g Instruction Manual page 76

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parameter set to AB, for example, will display the metering data as AB in fault records and display the
pickup setting as Vpp in BESTCOMSPlus. See Table 17 for a full list of possible settings. The Aux VT
Connection parameter is found on the System Parameters/Sensing Transformers settings screen in
BESTCOMSPlus. For more information on the auxiliary VT setup, see the Configuration chapter.
Aux VT Connection
AB, BC, CA
AN, BN, CN
Ground
Any
Timings
The timing mode can be set for definite or inverse.
Inverse
When inverse timing is selected, a Curve setting is provided to select programmable or table curves. The
user can select integrating reset timing to make the protective element use integrated reset and emulate
an electromechanical induction disk reset characteristic. The undervoltage inverse time curve with default
constants is shown in the Time Curve Characteristics chapter.
Programmable Curves
The programmable curve can be used to create a custom curve by selecting constants in the inverse time
characteristic equation. When curve P is selected, the constants used in the equation are those defined
by the user. Characteristics for trip and reset programmable curves are defined by Equation 8 and
Equation 9. Definitions for these equations are provided in Table 18.
���� =
���� − ����
����
Equation 8. Time Characteristics for Trip
Parameter Description
T Time to trip
T
D Time dial setting
M Multiple of pickup
Constant specific to
A
selected curve
Constant specific to
B
selected curve
Constant specific to
C
selected curve
Exponent specific to
N
selected curve
T Time to reset
R
Constant specific to
R
selected curve
Auxiliary Undervoltage (27X) Protection
Table 17. Auxiliary VT Configuration
Vx Fundamental, Vx Third Harmonic
Vx Fundamental, Vx Third Harmonic
Vx Fundamental, Vx Third Harmonic
V1, V2, and 3V0
��������
+ ��������
����
Table 18. Definitions for Equation 8 and Equation 9
Time that the 27X-x function will take to time out and trip.
Time dial setting for the 27X-x function.
Measured current in multiples of pickup. The timing algorithm has
a dynamic range of 0 to 1 times pickup.
Affects the effective range of the time dial.
Affects a constant term in the timing equation. Has greatest effect
on curve shape at high multiples of tap.
Affects the multiple of PU where the curve would approach
infinity if allowed to continue below pickup. Has greatest effect on
curve shape near pickup.
Affects how inverse the characteristics are. Has greatest effect
on curve shape at low to medium multiples of tap.
Relevant if 27X-x function is set for integrating reset.
Affects the speed of reset when integrating reset is selected.
Mode
��������
���� =
| ���� − 1 |
����
2
Equation 9. Time Characteristics for Reset
Explanation
9424200994 Rev U
Unit
VPP
VPN
VPN
VPN
BE1-11g