Basler Electric BE1-700 - Manual (Page 44)

CT Ratio. The BE1-700 requires setting information on the CT ratio. These settings are used by the
metering and fault reporting functions to display measured quantities in primary units. Sec. Amps is used
to select secondary CT amps. Pri Amps will display the primary amps of the CT based on the number of
turns. Either Turns or Pri Amps may be adjusted to achieve the desired turns ratio. Adjusting either will
automatically change the value of the other.
VTP Setup, VT Ratio. The BE1-700 requires setting information about the VT ratio, the VT connections,
and the operating modes for the 27/59 and 27R functions. These settings are used by the metering and
fault reporting functions to display measured quantities in primary units. The voltage input circuit settings
also determine which power measurement calculations are used. Most of these connections such as 3W,
4W, AN, or AB are self-explanatory.
VTX Setup, VTX Ratio. The auxiliary voltage input (VX) connection can be set for any voltage
combination VA, VB, VC, VAB, VBC, or VCA. When set for one of these voltages, the sync-check function
can automatically compensate for the phase angle difference relative to the reference voltage measured
at the three-phase voltage inputs. Alternately, the VX input connection can be set to GR. This setting is
used when the VX input is connected to a source of ground unbalance voltage or residual voltage such as
a generator grounding resistor, broken delta VT connection, or capacitor bank star point.
Table 3-1 lists the measurement function's settings.
Table 3-1. Measurement Functions Settings
Relay
Type
Function Range Increment
Unit of
Measure
Default
C CT Ratio 1 to 50,000 1 Turns 1
C
CT Ratio, Independent
Ground Input
1 to 50,000 1 Turns 1
V VTP Ratio 1 to 10,000 0.01 Turns 1
V VTP Connection
3W, 4W, AN, BN, CN,
AB, BC, CA
N/A N/A 4W
V 27/59 Pickup Mode
PP (phase-to-phase)
PN (phase-to-neutral)
N/A N/A PP
V 51/27R Pickup Mode
PP (phase-to-phase)
PN (phase-to-neutral)
N/A N/A PP
V VTX Ratio 1 to 10,000 0.01 Turns 1
V VTX Connection
AN, BN, CN, AB, BC,
CA, GR
N/A N/A 4W
V Nominal Frequency 25 to 60 1 Hertz 60
V Nominal Volts
50 to 250
0 = Disabled
0.1 Sec. Volts 69.3
C
Nominal Amps
0.1 to 2 (1 A CTs) 0.01 Sec. Amps 1
C 0.5 to 10 (5 A CTs) 0.01 Sec. Amps 5
C & V Phase Rotation ABC, ACB N/A N/A ABC
CONTACT-SENSING INPUTS
BE1-700 relays have four contact-sensing inputs to initiate BE1-700 relay actions. These inputs are
isolated and require an external wetting voltage. Nominal voltage(s) of the external dc source(s) must fall
within the relay dc power supply input voltage range. To enhance user flexibility, the BE1-700 relay uses
wide-range ac/dc power supplies that cover several common control voltage ratings. To further enhance
flexibility, the input circuits are designed to respond to voltages at the lower end of the control voltage
range while not overheating at the high end of the control voltage range.
3-4 BE1-700 Input and Output Functions 9376700990 Rev M