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Design principle of high-precision clamp meter


Impedance, load is the. Table 2 secondary winding leakage impedance of M, t, M winding resistance and leakage resistance, respectively scoop and load the NsR ~ s, M. As the two primary current clamp meter for the same current. So it may be regarded as the two primary access to a current series. By the reciprocity theorem can be easily obtained clamp meter error. Quantitative statement of reciprocity: in the 1, l-side current,[link widoczny dla zalogowanych], the voltage received at both ends of the 2,2, 2,2 side is equal to the current, the voltage received at both ends 1,1. Then use the current source and voltage source equivalent conversion between, can be drawn as Figure 2 Figure 3 shows the equivalent form. Core 2 (second to clamp meter) across the primary winding voltage of M {Nl | N3 {i \The equivalent circuit of core 1 error (the first to clamp meter) across the primary winding voltage of M \+ N3Nz1) nfl a (z2 + ≯ + R {f} {tzz +, z + Rft) i and I, I the voltage across t for the above two voltage and. taking into account the West \there are puzzle】 (2) from (2) that, combined clamp meter error of a ?:±?± mother, base ± 璺! zz'z3 (3) by (3) that, combined type clamp meter clamp meter error is the error of a single product (Excluding, t it). visible. with this method is not difficult to obtain highly accurate clamp meter. To manufacture and ease of use, so stern = . In fact,[link widoczny dla zalogowanych], NL = 1. Clamp Table I, manufacturing and traditional manufacturing methods the same. the second to clamp meter just need to double the secondary winding turns, and tap in the middle. This should be properly increasing the core cross-section core diameter chop population S, the S / d remain unchanged. proposed to be increased to increase the cross-section core height. When core diameter and stay out of the winding window area OK,[link widoczny dla zalogowanych], as long as the winding time filled the space set aside, then the / pi is a constant, it is independent of wire diameter. Typically, less than 500 turn secondary, the current density to take 3 ~ 5m. When the post-secondary stern increases the number of turns , secondary current I becomes smaller,[link widoczny dla zalogowanych], z,[link widoczny dla zalogowanych], and, simultaneously increased. can increase the load voltage to obtain the necessary puzzle, but not to R, q should be increased to at ,>÷,, and the voltage amplification by the amplifier (note that . This time, the amplifier output current and power is very d'lj, with the most common op-amp can meet the requirements.) adding an op amp as is convenient and cheap. so on, should take a small value, and meet Ro < - ≯ requirements, which will improve the accuracy of clamp meter. Third, the conclusion above, a detailed analysis of our high-precision clamp meter design and manufacture of the error sources and should pay attention to. Our conclusion has been confirmed by experiments So to create a 0.1 - 0.02 Clamp Meter is a safe. This completely solved the line current measurement with high accuracy, which is that people dream of the past century. of the results of this study will be dedicated to the reader. but without the patented form, its purpose is to enable the majority of producers and researchers are able to enjoy the results in a timely manner. References I LU Wen down. with two-port network theory to the design of high accuracy current and sensor each flat type shunt. metrology .1985.52 C-prison Sur. Geshou Ren. basic circuit theory. People's Education Press, .1979 f Han Songlin compiled and distributed (on the next page i0) in the three-phase three-wire power-down protection is not treated with closed the principle of the triangle to be detected. In this paper, the combination of theory and practice based on the extracted power-down protection alarm circuit has a wide range of promotional value. IV Conclusion This article describes the program of orthogonal cross complementing the provision of compensation after pressure full performance of the prototype type test, and through the Northeast Electricity Authority and the Liaoning Provincial Bureau of Technical Supervision, co-chaired the appraisal. more than 200 products now available through the site 4 more than a year to run, trampling to users. now is based on user requests a power-down timing function and the development of automatic tracking type of new products, customers and readers want the support and correction. I Yusheng Rong References - drop the voltage transformer secondary circuit of audio and spoon. electrical measuring Li & Instrumentation .1991.12. PT secondary cable drop compensation for automatic tracking of audio and spoon. Electrical Measurement & Instrumentation .199253 Peng Shixiong book. voltage transformer secondary wire drop testing error caused by energy metering calculation and the more technology changes - Water Power Press, 1987, spacious (Zhou Guangyi compiled and distributed)
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