1508 Words7 Pages

Metering Formula
1. Meter Multiplier
Meter Multiplier - the multiplier applied to the register reading to obtain kilowatt-hours. M = Kh X Rr X Rs X CTR X VTR
10,000
Where ;
Kh = watt-hour constant of the meter in watt-hour per revolution
Rr = register ratio = the number of revolutions of the register worm wheel for a revolution of the first dial pointer (right hand).
Rs = gear ratio = the number of revolution of the disk for one revolution of the first point
CTR = current transformer ratio
VTR = voltage transformer ratio
Example #1:
A G.E., three phase, three wire, 120 volts, type VM-63-A, Form 5A, Class 20,
KWh meter indicates Kh of 2.4 at its nameplate and register ratio of 166-2/3 was installed at 13.2 KV wye grounded*…show more content…*

of the meter resulted to 11.98 rev. of the standard. g). Indicate the percent error of the above test. h). Average accuracy of the above meter. Solution: Compute the Kh of the standard used For Light Load : Kh = 0.6 X 240 = 1.2 120 For Full Load : Kh = 0.6 X 240 X 50 = 12 120 5 a) Compute the Light Load rev. based on the meter and standard CR = Kh(MUT) X Rev.(MUT) X V(std) = 28.8 X 1 = 24 Kh(std) X No. of Element X V(MUT) 1.2 X 1 %A = Computed Rev. X 100% = 24 X 100% Actual Rev. 24.05 %A = 99.79% b) Compute the Light Load rev. based on the meter and standard CR = Kh(MUT) X Rev.(MUT) = 28.8 X 1 = 24 Kh(std) X No. of Element 1.2 X 1 %A = Computed Rev. X 100% = 24 X 100% Actual Rev. 23.98 %A = 100.08% c) Compute the Light Load rev. based on the meter and standard CR = Kh(MUT) X Rev. (MUT) = 28.8 X 2 = 24 Kh(std) X No. of Element 1.2 X 2 %A = Computed Rev. X 100% = 24 X 100% Actual Rev. 24.04 %A = 99.83% d) Compute the Full Load rev. based on the meter and standard CR = Kh(MUT) X Rev. (MUT) = 28.8 X 10 = 24 Kh(std) X No. of Element 12 X 1 %A = Computed Rev. X 100% = 24 X 100% Actual Rev. 24.07 %A = 99.71% 6 e). Compute the Full Load rev. based on the meter and standard CR = Kh(MUT) X Rev. (MUT) = 28.8 X 10 = 24 Kh(std) X No. of Element 12 X 1 %A = Computed Rev. X 100% = 24 X 100% Actual Rev. 24.08 %A = 99.67% f). Compute the Full Load rev. based on the meter and standard CR =

of the meter resulted to 11.98 rev. of the standard. g). Indicate the percent error of the above test. h). Average accuracy of the above meter. Solution: Compute the Kh of the standard used For Light Load : Kh = 0.6 X 240 = 1.2 120 For Full Load : Kh = 0.6 X 240 X 50 = 12 120 5 a) Compute the Light Load rev. based on the meter and standard CR = Kh(MUT) X Rev.(MUT) X V(std) = 28.8 X 1 = 24 Kh(std) X No. of Element X V(MUT) 1.2 X 1 %A = Computed Rev. X 100% = 24 X 100% Actual Rev. 24.05 %A = 99.79% b) Compute the Light Load rev. based on the meter and standard CR = Kh(MUT) X Rev.(MUT) = 28.8 X 1 = 24 Kh(std) X No. of Element 1.2 X 1 %A = Computed Rev. X 100% = 24 X 100% Actual Rev. 23.98 %A = 100.08% c) Compute the Light Load rev. based on the meter and standard CR = Kh(MUT) X Rev. (MUT) = 28.8 X 2 = 24 Kh(std) X No. of Element 1.2 X 2 %A = Computed Rev. X 100% = 24 X 100% Actual Rev. 24.04 %A = 99.83% d) Compute the Full Load rev. based on the meter and standard CR = Kh(MUT) X Rev. (MUT) = 28.8 X 10 = 24 Kh(std) X No. of Element 12 X 1 %A = Computed Rev. X 100% = 24 X 100% Actual Rev. 24.07 %A = 99.71% 6 e). Compute the Full Load rev. based on the meter and standard CR = Kh(MUT) X Rev. (MUT) = 28.8 X 10 = 24 Kh(std) X No. of Element 12 X 1 %A = Computed Rev. X 100% = 24 X 100% Actual Rev. 24.08 %A = 99.67% f). Compute the Full Load rev. based on the meter and standard CR =

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