a) For single-phase circuits, the calculation formula of motor power is: P=IUcosφ. Since the power measurement circuit of single-phase circuit is the measurement circuit of Weiyi, its load power is also Weiyi, so you can use HIOKI3286 directly. For the power analyzer measurement, the measurement results can be read directly from the HIOKI3286 power analyzer. The measurement circuit is shown in Figure 1. b) For the three-phase circuit, the measurement circuit is shown in Figure 2. The calculation formula of the three-phase motor power is: P = 1.732 IUcos φ. Since the power measurement circuit of the three-phase circuit is a three-phase measurement circuit, this involves its Whether the load power is balanced, if its load power is balanced, it can be directly measured with the HIOKI3286 power analyzer, and the measurement results are read from the HIOKI3286 power analyzer. c) If its load power is not balanced, the measurement circuit is still measured directly with the HIOKI3286 power analyzer according to Figure 2. The measurement results from the HIOKI3286 power analyzer will produce a comparative measurement error. This is because the formula is: P=1.732IUcosφ, where the value of current I is derived from the clamp sensor of the instrument. If the load of the phase measured by the clamp sensor is large, the reading of the measurement result will increase accordingly. Large, if the load of the phase measured by the clamp sensor is light, the reading of the measurement result will be correspondingly reduced. Therefore, if its load power is not balanced, the measurement circuit should perform a second measurement of the motor power according to Figure 3, and add the secondary measurement results read from the HIOKI3286 power analyzer. Motor power is: P = P1 + P2 Three-phase active power P=P1+P2=-O.54+1.98=1.44kW Three-phase apparent power S=0.866 (2.61+2.57)=4.49kVA Power factor λ=P/S=1.44/4.49=0.321 d) Measurement of three-phase four-wire loop. If the load power is balanced, the power and power factor measurement of the three-phase four-wire loop is the same as that of the three-phase three-wire loop. It does not need to use the neutral line. With the HIOKI3286 power analyzer, the measurement results can be read directly from the HIOKI3286 power analyzer. However, for a three-phase unbalanced load, the measurement method is the same as that of the single-phase two-wire system, and the unit is set to the single-phase measurement mode, but the measurement circuit should be wired and measured according to Figure 4, and the three-phase load is based on the neutral line. Separately measure the three measurements taken from the HIOKI3286 power analyzer and accumulate these power readings. The power at this time should be: P=P1+P2+P3 Previous page Mirror Mould,Fender Mould,Motor Guard Mould,Automotive Exterior Parts Mold Taizhou ANO MOULD CO.,LTD , https://www.ainomould.com
2. Power measurement