PTS 400.3 PLUS Operation Manual_R02 Page 154/306
Nominal ratio
r
n
= NP
n
/NS
n
Measured ratio
r = IP/IS = NP/NS
Ratio error
E = [r/r
n
–1]*100 [%]
Input of nominal ratio
To calculate the ratio error E the specified ratio of the trans-
formers must be defined. This is done by input of primary nom-
inal value NP and secondary nominal value NS or nominal ra-
tio at NP with NS = 1.
The fields of the reference are grey marked and will be the
base value for the calculation of NP or NS in the results display
section.
Reference for voltage ratio calculation
Select / Edit Voltage transformer data
Settings for primary and secondary voltage in-
puts
Voltage Transformer selection
Database PT Type
Taking an existing dataset from the direc-
tory.
Editing a PT type data set.
Primary voltage measurement input
The definition is common for all three phases and must be different for pri-
mary and secondary input, otherwise the measurement is not started.
Definition of primary voltage input
Select the measurement mode, direct voltage input or Hotstick U, for the pri-
mary voltage Up, of the primary input on the voltage transformer.
Secondary voltage measurement input
Definition of secondary current input
Select the measurement mode, direct voltage input or Hotstick U, for the pri-
mary voltage Us, of the secondary input on the voltage transformer.
Load/save settings from/to directory
Exit, back to calling menu
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