Rectifier and Bond Reading Tim Jenkins. Basic Electric - Shunts.
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Transcript of Rectifier and Bond Reading Tim Jenkins. Basic Electric - Shunts.
Rectifier and Bond Reading
Tim Jenkins
Basic Electric - Shunts
Basic Electric - Shunt Formulas
• Calculate Current– Given - Shunt ( .01 ohms & voltage across the shunt = 50 Mv)
– Convert units of voltage, 50mv = .05v
– Calculate current using Ohm’s law• I = .05 v/.01 ohms = 5 amps
– Given - Shunt ( 15 amps, 50mV)• Measured voltage drop = 28mV
– Determine shunt rating• Rating = 15 amps/50mV = .3 amps / mV
– Calculate current• Current = .3 amps / mV x 28 mV = 8.4 amps
Slide Resister Application
Resister Wire Application
The amount of Resistance is made by the Length of the Wire.
Disconnect Bond Wire for Amp Drain Reading
Amp Drain Reading
Make Connection in series with the Circuit
1.36 Amp Current Drain
Slide Resister
Lighting Arrestor
Connection Made on Resister from Foreign Structure and Columbia.
Disconnection to get Amp Drain must be made in series with the circuit.
Direct Bond Connection, No Resistance
Shunt Resister
Measuring Amp Drain by Measuring Voltage Drop Across the Shunt. Ratio is normally found on Shunt. .001V = 1A
7 milivolts = 7 Amps
Polarity does not matter.
Make connection across Shunt.
Ratio for Shunt
Shunts do not have to be disconnected in BI-monthly and Annual inspection.
Connect meter in serious for amp reading
on the structure or anode wire.
Alternative method – use shunt for amp readings.
Take mili-volt reading across shunt then use ratio to figure total amps.