Suggestion: Visit www.geotronixsupply.com/application-notes/A-Revi... etc. for more info IEEE Std 43 uses: Rc=Kt x Rt Rc is insulation resistance in MOhms corrected to 40degC Rt is measured insulation resistance in MOhms at temperature t Kt is insulation resistance temperature coefficient at temperature t Kt versus temperature plot is obtained by plotting several measurement points. Logarithmic scale is used for temperature. Once the plot is obtained the Kt may be determined from such plot. Approximate values for Kt are obtained from the plot by doubling insulation resistance for each 10degC reduction in temperature (above dew point) and has been found typical of some new windings. However, the testing and the above formula for Rc is essentially following the formula from my previous posting. There is nothing new theoretically in this IEEE Standard. Please notice that the original posting does not call for any IEEE Std. Therefore, a general formula, such as one I posted, may be needed.
An loop impedance test is conducted to make sure that, if a fault occurs in an electrical circuit, the fault current will strong be enough to set off the circuit protection. If a fault current is left undetected, circuits can overheat and catch on fire.
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Rc=Kt+Rt.
Suggestion: Visit
www.geotronixsupply.com/application-notes/A-Revi...
etc. for more info
IEEE Std 43 uses:
Rc=Kt x Rt
Rc is insulation resistance in MOhms corrected to 40degC
Rt is measured insulation resistance in MOhms at temperature t
Kt is insulation resistance temperature coefficient at temperature t
Kt versus temperature plot is obtained by plotting several measurement points. Logarithmic scale is used for temperature.
Once the plot is obtained the Kt may be determined from such plot.
Approximate values for Kt are obtained from the plot by doubling insulation resistance for each 10degC reduction in temperature (above dew point) and has been found typical of some new windings.
However, the testing and the above formula for Rc is essentially following the formula from my previous posting.
There is nothing new theoretically in this IEEE Standard.
Please notice that the original posting does not call for any IEEE Std. Therefore, a general formula, such as one I posted, may be needed.
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What is the purpose of loop impedance test required?
Pls answer me cant understand
An loop impedance test is conducted to make sure that, if a fault occurs in an electrical circuit, the fault current will strong be enough to set off the circuit protection. If a fault current is left undetected, circuits can overheat and catch on fire.
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