vectoring basics & 1 element eric haut - pgn
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Vectoring BasicsStart With a Zero
Reference Voltage. Wye – ENA Delta – EBA
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Vectoring Basics Potential – Open Arrow. Current – Closed Arrow. Arrowhead Denotes Polarity. A & C Currents Enter the Polarity side of a Current Coil. The ONLY Current Coil that is ever Reversed is B-Phase. B-Phase Current Coil Reverses Whenever you Alter it. Half Coils and ‘Z’ Coils are considered altered. All Meter Elements Have Forward Torque at Unity Power
Factor. You cannot have a C-Phase without first having A-Phase and B-Phase. Forward torque means less than 90 degrees between the Potential coil and the current coil.
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Sequence for Vectoring Learn and Memorize the Three Basic Service Vector Diagrams. Learn and Memorize Meter Footprints. The Meter Footprints show the Potential Connections and
Currents being measured. Labeling the connections is helpful. Apply the Rules Regarding Forward Torque and Which Current
Coils may be Reversed. Draw the Meter Vectors. Create a hypothetical load. Do the Math.
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One Element Meters
Forms 1 & 3 (Conforming) Forms 2 & 4 (Non-Conforming)
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Form 1 and 3 System Vectors.
Meter Vectors.
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Form 1 and 3 Simple 2-Wire Circuit. N=2 , N-1=1 Element. Conductor w/o Current Coil
is Common to the Potential Coil.
An Element is One Current Coil and One Potential Coil.
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Form 2 and 4 Service / System Vectors.
Current coils are ½ to Compensate for Potential Coil being across 240 Volts
Meter Vectors. B-Phase Current is
reversed.
This Creates Forward Torque for Both Current Coils Interacting with the Potential Coil.
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Form 2 and 4 3-Wire Circuits. N=3 , N-1=2. # of Coils = 1.
Note-Some may be Tempted toConsider this a 1 ½ Element Meter.Current Coils are Half. Two HalfCoils Makes One Full CurrentCoil.
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Service Vectors and Footprint
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Label the Meter Connections
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Drawing the Meter Vectors Apply the Rules Regarding
Forward Torque and Which Current Coils may be Reversed.
Draw the Meter Vectors.
Current Coils are ½. This meansB-Phase is reversed. Voltage isBetween A-Phase and B-Phasewith Polarity at A-Phase.
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Drawing the Meter Vectors Apply the Rules Regarding
Forward Torque and Which Current Coils may be Reversed.
Draw the Meter Vectors.
Current Coils are ½. This meansB-Phase is reversed. Voltage isBetween A-Phase and B-Phasewith Polarity at A-Phase.
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Form 2 and 4Invent a load:A-phase has 1200 watts. B-phase has 1800 watts.A-B phase has 3600 watts.
1200/120=10 amps1800/120=15 amps3600/240=15 amps6600 watts total
Ia = 10+15 = 25 ampsIb = 15+15 = 30 amps
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Form 2 and 4Remember current coils are ½ and Potential is Eba.
25amps/2 x 240 x cos 0º + 30amps/2 x 240 x cos 0º
= 6600 watts
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4s vs. 3s (3-Wire 120/240)
Both are commonly used for 120/240 3-Wire.
4s has half current coils. 3s has full current coils. A 4s with 400/5 CTs will
have a multiplier = 80. A 3s with 400/5 CTs will
have a multiplier = 40.
Discussion…
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The End