METREL EurotestXC MI 3152 - Page 151

MI 3152(H) EurotestXC (2,5 kV) Tests and measurements
150
Connection diagram
Figure 7.85: AUTO TT measurement
Measurement procedure
 Enter the AUTO TT function.
 Set test parameters / limits.
 Measure the impedance Zref at origin (optional), see chapter 7.14 Voltage Drop.
 Connect test cable to the instrument.
 Connect test leads or Plug commander to the object under test, see Figure 7.85.
 Start the Auto test.
 Save results (optional).
Figure 7.86: Examples of AUTO TT measurement results
Measurement results / sub-results
Uln
Voltage between phase and neutral conductors
ΔU
Voltage drop
Z (LN)
Line impedance
Z (LPE)
Loop impedance
Uc
Contact voltage
Zref
Reference Line impedance
Ipsc (LN)
Prospective short-circuit current
Ipsc (LPE)
Prospective fault current