Abstract:
This paper identifies with the field of building up an electronics Digital power-factor
(PF) meter to supplant the ordinary electrodynamic type. The plan depends on voltage
to recurrence change and twofold rate increase methods. For the primary half
estimating period, a flag relative to the pinnacle voltage Vm is connected to control
the exchanging limit dimension of the comparator of the voltage to recurrence
converter (VFC), while the contribution of the VFC is kept at reasonable steady
dimension, hence delivering a yield recurrence conversely corresponding to Vm,
which is considered and connected an information to a parallel rate multiplier (BRM).
For the second half estimating period, a flag corresponding to the result of the
pinnacle voltage and the power factor Vm cos(ϕ), is connected to the VFC, while the
starting dimension of the comparator is kept consistent. The VFC recurrence yield is
then specifically relative to Vm cos(ϕ). This is made accessible through gating system
to the BRM recurrence input. The BRM recurrence yield is summed over a
predetermined timeframe to give PF data.
Description:
Both little and medium-measure organizations in Bangladesh confront the Power
Factor discipline which is being required by the supply experts for encroachment of
statutory limits. From the power structure discernment this piece of industry is
seriously dealt with due to budgetary objectives. Such endeavors run a few
developments of eight hours consistently by day. All around, the power input is 11 kV
three phase, which is communicated down to 440 V three phase through a delta-wye
transformer of grade some place in the scope of 300 and 1000 kVA. The supply
specialists present a kWh meter and a kVAh meter joining a kVA MD pointer. In this
country a base power factor of 0.85 is mandatory on the HT side. Diverse parts of
confirmation of the power factor, dimension of precision of the meters on moving
weights with fluctuating power factors, and the legality of the discipline constrained
on the ventures are discussed in this paper. Some convenient signs on the
improvement of the Power Factor Meter are in like manner discussed.
