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Symmetrical three-phase reactive power measurement circuit


. 2 watts basic working principle of the table fork called watt power meter. Commonly used letters. Wattmeter has two coils, a current coil. A voltage coil in Australia I used watt absorbed by the amount of active power load impedance z, the current coil in series with the load (reflected load current), voltage coil in parallel with the load (reflected load voltage u). Figure 1: Received {199412-2690 l3 Guangdong Machinery Research Institute in Figure 1,[link widoczny dla zalogowanych], when the wattmeter wiring, W-U/cos (・) a ?, ・ lcosT, =- p w is the load impedance meter reading absorption of active when watt reverse coil current or voltage when coil A: U / cos (. a,) a / cos (- U. a / cos (180. a) a - Uleosq ~ one watt table The reading is given real power load impedance, a negative reading for the absorption of the active power load impedance. W a cos (』tI) - A ● ● = 3, co8 (u ... 1) - A ● A 3ujcos (u ... I) U phase voltage; Bu one phase current (1) three-phase power supply phase sequence for the A-B-c (Figure 3W-3U/cos (90. +, a 1 a. m mouth of a search for a map Q 3ulsing ~ =- a W ① When, for the inductive load (cos ~ 90.), the watt meter readings for the negative. wattmeter pointer is reverse biased, then the table needs to change w + / a knob, or changing the current coil pole of the data can be read. ② watt times the negative reading is precisely symmetrical three-phase circuit absorb reactive power. (2) three-phase power supply phase sequence for the A-c-B (Figure 4) one. a 1W-3U/cos '90. one by one 3Ulsin ~ =- ÷ 0V30 D ① watt for a positive reading. ② Watt meter readings of the small-fold symmetric three-phase circuit is absorbing reactive power. A symmetrical three-Figure 34 phase reactive power measurement circuit basic conclusions 1. wattmeter with a symmetrical three-phase circuit can measure the reactive power. 2. If the three-phase power supply line of Zodiac is known, when the power for the A-phase sequence B-c phase sequence,[link widoczny dla zalogowanych], the symmetry of three-phase reactive power measurement circuit, said three-phase circuit 9l absorbed reactive power as: mouth one by one 3W, when the power phase sequence for the A-c-B phase sequence,[link widoczny dla zalogowanych], the symmetry three-phase circuit for the reactive power absorbed: the mouth of a 3.. If the power supply phase sequence is not clear, the measurement of symmetrical three-phase circuit reactive power watt meter readings can be positive or negative (that might be biased, but also may reverse biased), l0l 3W is a three phase circuit of a reactive power absorption of B or issued out of the reactive power required by the nature of the circuit - capacitive or inductive, or according to the characteristics of power - have owed to Reed decision. 4. If the three-phase power supply line is not clear sign of the Zodiac,[link widoczny dla zalogowanych], the Figure 2 A, B, C should be interpreted as arbitrary,[link widoczny dla zalogowanych], as long as the current coil watt power line was connected in one phase , the voltage across the coil in the other two-phase power line, three-phase circuit can be measured reactive power, the watt meter readings of dealing with 3. References 1 Chiu off the source editor. Circuit (Third Edition) Higher Education Press .19892 Huang Muyi editor. power with the network theory. Wuhan; Huazhong University Press, 1987A Figure 4MEASUREMENT0FTHEREACTIVEP0WERINTHREE-PHASEBALANCEDCIRCUITSLiHongHuangKaishengYangJie (GuangdongUnjversityofTechnology, WuShanCampusDept.ofIndustrialAutomation) AbstractThefundamentalsofthemeasurementoftheIeactivepowerinthree-phasebalancedcircuitsarediscussedindetail.ThegeneralconclusionisgJvenaboutthedataindicatedbythemeter-whichisusedtom ~.: asLIrethereactivepower-Andreadingmaybepositiveornegtivewhenthephasesequencesofthesourseisnotconfirmed. Dian UhpeedowyK

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