The PFQ power factor meter measures cos phi with a moving coil movement and an electronic transducer. The transducer measures the phase angle between an AC voltage and the corresponding AC current, converting the signal into a proportional DC current which is then fed to the moving coil instrument.
The measuring is principally single-phase (connection WC1), however, in a three-phase network without neutral the voltage is measured between two phases. In principle, the measurement cannot be made if either the voltage or the current is zero. The pointer will indicate the mechanical zero (always placed at scale start) when the voltage is disconnected. At current signals below 5% of In, the pointer can be adjusted to indicate a required value by means of a potentiometer (placed on the rear).
Note: At heavy non-linear loads (e.g. thyristor-controlled engines and rectifiers) the zero crossing of the current is delayed, and a power factor measurement is thus not possible. Measurement of VAr/watt is recommended in these cases (VAr/watt = tan phi).
- 1.5 accuracy class
- 90° and 240° pointer deflection
- IP52 protection (IP54 on request)
- Measuring range: 0.5 cap. …1… 0.5 ind., 0.7 cap. …1… 0.3 ind., 0…1 cap., 0…1 ind
- Voltage: 57.7… 63.5… 100… 110… 124… 220… 230…240… 380… 400… 415… 440V AC ±20%
- Current (Inom): -/1 A and -/5 A from external current transformer
- Approved by classification societies
- Available in size Q96
Borna Niroo Karan (Bornika) is the exclusive agent of DEIF in the fields of consultation , sales and distribution of power industry products including Power factor meter products