KVAR RATING CALCULATOR,CAPACITOR BANK SIZE CALCULATION

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  Determination of Required Capacitor Rating by measurement 3 Methods are used. 1. Measurement with current and power factor 2.Measurement with recording of Active and Reactive power. 3.Measurement by Reading Meters . 1 . Measurement with Current and power factor The active power P is calculate from the measured voltage V ,apparent current Is and Power Factor P=√3*Voltage*apparent Current*cosψ *10^-3 If the desired power factor cosψ has been specified, the capacitor power rating can be calculate from the following formula: Qc = P. (tan ψactual - tanψ desired) Let's See the Example Measured Apparent Current Is : 248 Amps Power Factor cos ψ1 = 0.86 Desired Cos ψ2 = 0.92 Voltage V :397 V p=√3 * 397 * 248 * 0.86 * 103 P = 146.6 KW Qc= P. (tanψ actual - tanψ desired) = 146.6(0.59 - 0.42) = 24.9 KVAR
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ACCURACY OF GRADE ZERO GAUGE BLOCKS BASED ON BS 4311:PART 1:1993

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 Grade 0 gauge blocks are very high accuracy

It is used in controlled environment by skilled inspection staff

It is the reference standard used to calibrate / verification of other lower grade .

Here the accuracy and tolerance of the Gauge block set are bellowed mentioned

please go throng the standard based on BS 4311:Part 1


Nominal Length

(inch)

Tolerance of deviation of measured central length (inch)

Parallelism

(inch)

Flatness

(inch)

Over 0

Up to 0.4

± 5 µin

4 µin

4 µin

Over 0.4

Up to 1

± 6 µin

4 µin

4 µin

Over 1

Up to 2

± 8 µin

4 µin

4 µin

Over 2

Up to 3

± 10 µin

5 µin

4 µin

Over 3

Up to 4

±12 µin

5 µin

4 µin



Usage                 

Application                        

Grade(0 )

Inspection Use

Checking the accuracy of the gauge

Calibrating result

 

0 or 1

Calibration use

 

Checking the accuracy of the gauge block for workshop

0

Checking the accuracy of the gauge block for inspection

0

Checking the accuracy  of instrument

0











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