* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Click Here to Downlaod
Survey
Document related concepts
Electrical substation wikipedia , lookup
Mains electricity wikipedia , lookup
Wireless power transfer wikipedia , lookup
Pulse-width modulation wikipedia , lookup
Power over Ethernet wikipedia , lookup
History of electric power transmission wikipedia , lookup
Alternating current wikipedia , lookup
Three-phase electric power wikipedia , lookup
Electrical engineering wikipedia , lookup
Switched-mode power supply wikipedia , lookup
Audio power wikipedia , lookup
Electric power system wikipedia , lookup
Standby power wikipedia , lookup
Electronic engineering wikipedia , lookup
Power factor wikipedia , lookup
Transcript
ELECTRICAL MEASUREMENT LAB Department of Electrical Engineering Supervisor Submitted by Dr. Girish Parmar Control & Instrumentation (Associate Professor) Department of Electronics Engineering University College of Engineering, Rajasthan Technical University, Kota February, 2015 Experiment No.: 3 OBJECT: To measure the power in 3-φ load by (i) two wattmeter method at different value of load (ii) One watt meter method. APPARATUS REQUIRED: Wattmeter, ammeter, connecting loads, 3- φ star connection load, voltmeter. THEORY: Two wattmeter method is the most commonly used method for measurement of power as this can be used for balanced & unbalanced of the used is balanced. The reading of W1 wattmeter is given by is a balanced W1 = E12 i1 cos (30+ φ) While reading of W2 wattmeter is given by W2 = E32 i3 cos (30- φ) Since if it is a balanced circuit |E12 | = |E32| = √3 |EPN| |i1 | = |i3| = |i| (say) Therefore W = W1 + W2 W = √3 EPH i cos (30+ φ) + √3 EPH i cos (30- φ) = 2 √3 EPH i cos 30 cos φ = 3 EPH i cos φ W = √3 EL i cos φ This is nothing but the 3- φ power in the balanced load. CIRCUIT DIAGRAM: Fig. 3.1 Circuit Diagram Of Power factor Meter Using watt meter CALCULATION: Power Factor = cos φ φ = tan-1 [√3 (W1-W2) / (W1+W2)] φ = tan-1 [√3(-160 / 400)] φ = tan-1 [-√3 × 0.4] φ = -34.71 P.F. = cos φ = 0.82 OBSERVATION TABLE: S.NO. E I W1 (VOLTS) (AMP) (WATT) W2 (WATT) W1 + W2 W1 – W2 (WATT) (WATT) % ERROR Calculation of power factor: Φ = tan-1 [√3 (W1 – W2) / (W1 + W2)] P.F. = cos Φ RESULT: We have performed the experiment of power factor measurement by 2- Wattmeter method. And the results are………………. Power (active) = W1 + W2 Power factor = ……………