9328900990 Rev L BE1-951 Input and Output Functions 3-5
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 BE1-951 requires setting information about the VT ratio, the VT connections,
and the operating modes for the 27/59 and 51/27R 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.
VTP 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
Function Range Increment Unit of Measure Default
CT Ratio 1 to 50,000 1 Turns 1
CT Ratio, Independent
Ground Input (optional)
1 to 50,000 1 Turns 1
VTP Ratio 1 to 10,000 0.01 Turns 1
VTP Connection
3W, 4W, AN, BN, CN,
AB, BC, CA
N/A N/A 4W
27/59 Pickup Mode
PP (phase-to-phase)
PN (phase-to-neutral)
N/A N/A PP
51/27R Pickup Mode
PP (phase-to-phase)
PN (phase-to-neutral)
N/A N/A PP
VTX Ratio 1 to 9,999 0.01 Turns 1
VTX Connection
AN, BN, CN, AB, BC,
CA, GR
N/A N/A AN
Nominal Frequency 50, 60 N/A Hertz 60
Nominal Volts
50 to 250
0 = Disabled
0.1 Secondary Volts 69.3
0.1 to 2
(1 ampere sensing)
0.01 Secondary Amperes 1
Nominal Amps
0.5 to 10
(5 ampere sensing)
0.01 Secondary Amperes 5
Phase Rotation ABC, ACB N/A N/A ABC
CONTACT SENSING INPUTS
BE1-951 relays have four contact sensing inputs to initiate BE1-951 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 BE1-951 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.
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