Voltage expressed in % of the nominal primary voltage (High), necessary to obtain the
nominal primary current of the transformer, with the secondary side (Low) short-circuited.
Several tests are required, one per winding, on the one hand, to calculate these
parameters, as well as an adequate calculation later on, using the results obtained in
each one of them, and also considering the nominal technical characteristics of the PT
(which are on the transformer plate) with respect to transformation ratio, connection
group, short-circuit impedance (or voltage) in % of nominal, nominal primary voltage or
High winding, and nominal secondary voltage or Low winding.
Template configuration:
The template is configured as follows:
• Generator: Auxiliary power output. Voltage Mode
• Time display: As chronometer in seconds. Stop mode: Push on dial
• V2in input voltage meter in Volts. Auto Mode (voltage measurement injected
into High winding).
• A1in input current meter in Amps. Auto Mode (Current measurement in
High winding, in this case short-circuited).
• Phase angle meter between current measured in A1in and the voltage
measured in V2in. (Phase angle between short-circuited current and injected
voltage).
• Power factor meter (cos phi) of the short-circuited transformer.
• Impedance (Z) meter of the short-circuited transformer in ohms.
• Reactive component meter of Z (X) in ohms.
• Real component meter of Z (R) in ohms.
Connections:
The Auxiliary Output Power Generator is used in voltage mode to carry out this test,
feeding between two phases of the High side of the PT and measuring the current it
consumes.
The bushings corresponding to
the two phases that are injected
are short-circuited in the LOW
side of the PT. It is very important
for the connection cables and
devices to the PT bushings to
have a large cross-section, as
very high currents can be
produced in the short-circuit.
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