Also this device can be called: VAF85, VAF 85.
VAF-85 voltamperephasemeter is intended to measure the values and phases of the alternating voltage and current and determining the phase sequence.
With meter of magnetoelectric system.
Measured current - 0.2 A to 10 A.
Device VAF-85 has a phase tester, which is a three-phase stator resolver and locked rotor. Rotor can be rotated by hand using a limb. Depending on the position of the limb changes voltage phase, the induced in the rotor winding, relatively voltage synchro stator voltage monitoring.
On the VAF-85 positioned limb dephaser inscribed with the division in degrees, and button his brakes.
Obverse meter has four switches:
- V1 switch has two positions - current measurements with a break and without breaking the circuit using electrical mites;
- V2 switch has two positions - measured values and the definition phase;
- double switch V3-B4 - to change the limits of measurement.
The upper part of VAF-85 derived terminals A, B, C for connection to the three-phase system voltage phase shifters. Terminals U, * and I are used to measure voltages and currents. For * and I terminals connected electrical mites which constitute a current transformer with a split magnetic core, a primary winding of which is carried out with a current.
The position of the limb can determine the phase of the measured current - the unit shows the angle between the voltage and current vector Uab or voltage, filed on clips * - I or * - U. This condition must be satisfied synchronous three-phase system voltages synchro stator and the measured current or voltage (powered by the same network).