A 1588
Multi range AC current clamps
8
Power Measurement
A 1588 current clamps have small phase shift (see Figure 7 and Figure 9) over wide frequency
range. Therefore they are well suited for:
Power and energy measurements (active, reactive, apparent)
Power factor measurements
Power/Energy efficiency
Leakage Current Measurement
Measurement Of Leakage Current By Direct Method
This method is used when measuring the current through one (embraced) conductor.
Figure 4:
Leakage current measurement
– direct method
Measurement Of Differential Current And/or Current Difference
The differential method sums the current passing through two or more active (embraced)
conductors. If no current is leaking to earth,, the sum of the currents passing through active
conductors must be exactly zero regardless of the load currents. If a leakage current is flowing
to earth, it must be equal to the difference in current between the conductors contained in the
current clamp (although, if alternative earth paths exist, this may not be equal to the current
passing through the PE conductor).
Note
Note that the direction of currents in the conductors must be considered if the differential
method is used.
Figure 5:
Leakage current measurement
– differential method
Determining Problems In Lighting And Grounding Systems.
Faults in electrical installations and equipment can cause additional continuous or short-
lasting leakage currents. Typical faults that can cause increased leakage currents are:
