CIRCUTOR AR5L Series - Manual (Page 32)

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6.1.1.- MEASURE
Use this option to set measuring conditions: CONNECTION MODE SETTING
( 3 or 4 wires, Aron, single-phase or bi-phase) and VOLTAGE and CURRENT
TRANSFORMATION RATIOS SETTING.
MEASURE :
 WIRING
PT / CT 3
Φ 3 Wires, 3Φ 4 Wires, 3PT–2CT, 1Φ y 1Φ Split..
Prim. V, Second. V, Prim. I
6.1.1.1.- WIRING: Circuit type
Choice of the circuit type to be analyzed (rotary input).
− 3Φ 4 Wires: To measure Three-phase systems with Neutral wire. (only in
AR5-L model)
− 3Φ 3 Wires: To measure Three-phase systems with Neutral wire. For this
arrangement 3 current clamps must be used.
− 3PT-2CT: To measure Three-phase systems with Neutral wire. For this
arrangement only 2 current clamps must be used.
− 1Φ: To measure Single-phase systems.
− 1Φ Split: To measure Bi-phase systems, composed by 2 Phases and the
Neutral wire. (only in AR5-L model)
Always that the measuring circuit type is modified, parameters
selected to be recorded must be checked.
6.1.1.2.- PT/CT : Transformation ratios
Voltage and current transformation ratios setting. The program will
sequentially inquire for following data:
− PRIM. V: Voltage transformer primary value.
− SEC. V: Voltage transformer secondary value.
− PRIM. I: Current transformer primary / Current clamp primary, used for
measuring the line currents.
− PRIM. I
N
: Current transformer primary / Current clamp primary, used for
measuring the neutral current. (only in AR5-L model)
NOTE 1 : If voltage is directly measured (no voltage transformer is used), you
must set PRIM.V = 1/SECV.V = 1.
NOTE 2 : PRIM. I & PRIM I
N
--> This option permits to program:
a) The ratio of the Current clamp to be used.
b) In case of a high voltage system, the measurement will be carried out through the
secondary of current transformers. A shunt ATS-III 5 A a.c./ 2 V a.c. or CP5 clamp will
be then required to enter the measurement signal into the analyzer (Never directly
connect the 5 A signal to the
analyzer .). For this case, the C.T. primary must be set at
the primary value of the C.T. used for measuring purposes.
Ratio set must be modified for each Current or transformer type change to avoid
measurement mistakes. Standard clamps give a voltage output (generally 2 a.c. at full-
scale).
NOTE : Secondary is always set at 2 V a.c. (it is not user-programmable).
6.1.2.- RECORD menu