Raptor
74
Connect as follows (the connection between phases H1 and H2 is described, repeat this
connection for phases H2H3 and for H3H1:
1. Connect the BLACK bushing of the Auxiliary Output to H2 of the PT.
2. Connect the RED bushing of the Auxiliary Output to the GREEN bushing of
the current measurement input A1.
3. Connect the BLACK bushing of the current measurement input A1 to H1 of
the PT.
4. Connect the RED bushing of the voltage measurement input V2 to H1 of the
PT.
5. Connect the BLACK bushing of the voltage measurement input V2 to H2 ot
the PT.
6. Short-circuit the bushings the Low side of the PT, X1 and X2, with adequate
cables.
Warning – It is very important for you to make sure that the pass-
extracting the cable from the inside, if there is one, or making sure
that the turn is open, with no possibility of accidental closure.
Test:
First of all, you must calculate the equivalent value at reduced voltage of the nominal
current of the PT. Use the following formula:
Pn/Vn=Inom of the PT
Where: Pn is the Nominal Power of the PT in KVA, Vn is the nominal primary voltage in
KV of the PT and Inom is the nominal current of the PT in Amperes.
Now calculate the value of the Short-circuited voltage:
(Vn * Vcc%/100)*1000 = Vcc in volts.
Where: Vn is the nominal primary voltage in KV of the PT, Vcc% is the value on
characteristics plate of the short-circuited impedance in %.
Calculate the respective value of reduced voltage according to availability of equipment
(9 A and 230 V max) in permanent:
Vccr = Vcc * Ired/Inom
Where: Vcc is the short-circuited voltage in Volts, Inom is the nominal current of the
transformer in Amperes and Ired is the reduced current that is going to be used, which
must be less or equal to 9 A (permanent max. of the auxiliary output of the equipment).
Start by setting a value at Ired of 9 A.
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