Basler BE1-11m, Instruction Manual

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9424200996 53-3
BE1-11 m Configuration
For Sensing Type: Four-wire
) cos( I V Watts
A A AN A
φ = ) cos( I V Watts
B B BN B
φ = ) cos( I V Watts
C C CN C
φ =
C B A 3
W W W Watts + + =
φ
) sin( I V Vars
A A AN A
φ = ) sin( I V Vars
B B BN B
φ = ) sin( I V Vars
C C CN CA
φ =
C B A 3
Vars Vars Vars Vars + + =
φ
where:
X PN P
I V ∠ − ∠ = φ
For Sensing Type: Three-wire
In three-wire sensing mode, the equivalent LN voltages are determined from the LL voltages assuming
3V
0
= 0V. This allows per-phase watts and vars to be determined and provides improved accuracy over a
two-element method when neutral current is present.
) Vˆ Vˆ ( 3 / 1 Vˆ
CA AB AN
− ⋅ = ) Vˆ Vˆ ( 3 / 1 Vˆ
AB BC BN
− ⋅ = ) Vˆ Vˆ ( 3 / 1 Vˆ
BC CA CN
− ⋅ =
Using the computed PN voltages, watts and vars are then computed using the equations listed under
four-wire sensing type, above.
For Single Phase Sensing Types: AN, BN, CN, AB, BC, CA
In single-phase sensing mode, the unknown PN voltages are calculated. Assuming a balanced three-
phase voltage is applied, the unknown PN voltages can be determined by scaling and rotating the
measured voltage as follows:
ABC Rotation
AN Sensing:
° − ∠ ⋅ = 120 1 V V
AN BN
° ∠ ⋅ = 120 1 V V
AN CN
BN Sensing:
° ∠ ⋅ = 120 1 V V
BN AN
° − ∠ ⋅ = 120 1 V V
BN CN
CN Sensing:
° − ∠ ⋅ = 120 1 V V
CN AN
° ∠ ⋅ = 120 1 V V
CN BN
AB Sensing:
° − ∠ ⋅ = 30 1 V V
AB AN
3
1
° − ∠ ⋅ = 150 1 V V
AB BN
3
1
° ∠ ⋅ = 90 1 V V
AB CN
3
1
BC Sensing:
° ∠ ⋅ = 90 1 V V
AB AN
3
1
° − ∠ ⋅ = 30 1 V V
AB BN
3
1
° − ∠ ⋅ = 150 1 V V
AB CN
3
1
CA Sensing:
° − ∠ ⋅ =
150 1 V V
AB AN
3
1
° ∠ ⋅ =
90 1 V V
AB BN
3
1
° − ∠ ⋅ =
30 1 V V
AB CN
3
1
ACB Rotation
AN Sensing:
° ∠ ⋅ = 120 1 V V
AN BN
° − ∠ ⋅ = 120 1 V V
AN CN
BN Sensing:
° − ∠ ⋅ = 120 1 V V
BN AN
° ∠ ⋅ = 120 1 V V
BN CN
CN Sensing:
° ∠ ⋅ = 120 1 V V
CN AN
° − ∠ ⋅ = 120 1 V V
CN BN
AB Sensing:
° ∠ ⋅ = 30 1 V V
AB AN
3
1
° ∠ ⋅ = 150 1 V V
AB BN
3
1
° − ∠ ⋅ = 90 1 V V
AB CN
3
1