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In the electronic stage table with three-phase three-line law review implementation of the table


At 0 or low power state, then the error is uncertain, leading to test three-phase three-wire meter power factor of 0.5, the measurement error for undefined. The rules of order of the power factor of O. 25 (L) state is absolutely no enamel on the check. Table 1 with three-phase three-wire law review implementation of the electronic stage table with three-phase three-line law review table table program is Professor of Engineering Peng Zhaoming by the hospital proposed by the hospital to improve the implementation of electrical measurement chamber. 1.1 fulfill the principle reason electrician shows that any three-phase three-wire and three-phase four-wire circuit the instantaneous power is p = u fifty 5 '(1), the Gong, - a phase-phase voltage instantaneous value ;,franklin marshall soldes,,-- current instantaneous value. Three-phase circuit, the average power: ['Ls'PUJ, costa + £ Ucos ~ (2) three-phase three-wire circuit is not neutral, zero-sequence current of each phase there is no path, the neutral current i is zero, that is, / ~ = io + ib + Zo --- 0 then a () (3) (3) Substituting (1), obtain p = ) The average power,, os (,) + UJ, cos (, 1o) (5),mbt chaussures paris, according to. 1.2 shows three-phase three-wire circuits Chinese (2) and (5) is completely equivalent to this test method on the table for the three-phase three-wire table provides a theoretical three-table method according to wiring diagram three table table access method that is three standard supply phase voltage, phase current, and then the table was seized power line voltage, phase current, shown in Figure 3. RM a 11RM 11RM-I1j seized a three-phase three-wire Yuan /, I, / Figure 3 Three-phase three-wire table method check wiring diagram of a table 17 a I. ¨ r. Total No. 415 37 2000 7 power to shake the bell with meter Ⅱ Iri0Muent & In ~ umentationV0L37 № 4l52000 seen from Figure 3, three-phase power output for the three-phase four-wire mode. 3 RM-11-type table for the total instantaneous power, respectively, P three-phase device the first and second power completely equivalent. 1.3 For the transformation of computing devices down after three-phase three-wire test method table table, specifications 100V, 5A when the device first and second side of the power calculation in Table 1. Form 1100V, 5A, when device A second class side of computing power due to power hoop apply standard table shows the power checklist shows the power eqmq ~ 1. OJR + P,abercrombie paris ouverture, = 3 ~ 100 /, / 3x5 = 866W ∞ m5 (P,birkenstock paris, + Ps + P ~ 3x100 /, / a ~ 5x0.5 = 433W wiring for the three-phase three-wire, voltage: 100V, current: 5A, than the results shown in Table 2 Table 2 compare the results CL311 device error PUlcos ~:, / D xl00x5 = 860W/Pxl00x5xO5 = 433W2 transformed experimental verification of instruments for the instruments used in the experiment: Germany ZERA's COM303__3 Type 0.01 Class Three-phase, tables, by the China Institute of Metrology certified by; Shenzhen Clou's CL311 type Table 0.02 Three-phase 3 validation method was used cL311 Lian-table for the table; reconstruction phase after the RM-11 sets as a standard to compare to the CL311 standards; with ZERA company COM303-3 对 CL311 standard for comparison by the comparison results in Table 2 can be seen that after transformation, the overall error of three-phase device with 0. A pair of scales vary in the extreme one, the description of the transformation test after three-phase three-wire method table table approach is feasible, the result is accurate and credible in the power factor of n5 (L] when completely avoid table RM-11 Standard low-power operation state to ensure the accuracy of three-phase devices, but also to ensure the credibility of the results validation, while the fork to meet the requirements of regulations JJG596-99 in the 0.5 (C) and 0.25 (L) and other load point of the school inspection requirements. 4 with two table method and the method with three tables compare the calibration error of law review table long two-phase three-wire 0.5 (L] are used when the power factor angle will move a little side 1 a 2, the A-phase standard power display> 0 to ensure the accuracy of calibration, while the traditional method of shifting perspective is accurate? work in practice, a large number of experiments to prove this through conventional methods, there are still some problems in Table 3 the author uses partial shift power factor 0.1 to 2. some standard table with three table method and the two table method to test the results of Table 3 with two table method and the method of the table with three different standard table of test results (test conditions Chau : three-phase three-wire, voltage: 100V, current: 5A) an l8-54 页 bottom left)
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