Electrical Engineering ⇒ Topic : Power factor improvement

Sunita
 
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, l_{C} be the capacitor current of Figure 1 (c), cos Φ_{1} be the initial power factor of Figure 1 (a), and cos Φ_{2} be the power factor of Figure 1 (c). \ FIGURE (1) Power factor improvement From Figure 1(d), .............. (1) .............. (2) Multiplying Eq. (1) by V, we get ................ (3) Therefore, active power remains constant after power factor improvement. Multiplying Eq. (2) by V, we get ................ (4) Net kVA after p.f. correction = Lagging kVA before p.f. correction  Leading kVA of equipment  
 
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