Electrical Engineering ⇒ Topic : Power factor improvement
POWER FACTOR IMPROVEMENT
The electrical energy is exclusively generated, transmitted, and distributed in favour of alternating current. So power factor comes immediately into picture. Most of the loads are lagging in nature because they are inductive load. Low lagging power factor undesirably causes an increase in current. The increase in current unnecessarily causes increase in additional losses.
Let I be the current drawn from source as shown in Figure 1 (a), /' be the current from source as shown in Figure 1(c) after p.f. correction, lC be the capacitor current of Figure 1 (c), cos Φ1 be the initial power factor of Figure 1 (a), and cos Φ2 be the power factor of Figure 1 (c).
FIGURE (1) Power factor improvement
From Figure 1(d),
Multiplying Eq. (1) by V, we get
Therefore, active power remains constant after power factor improvement.
Multiplying Eq. (2) by V, we get
Net kVA after p.f. correction = Lagging kVA before p.f. correction
- Leading kVA of equipment
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