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Watt Some Problems in use

More complex wiring, the slightest mistake and easy access error occurs 44 * result in instrument damage or experimental failure. Which could be considered in the measurement before the first current meter,[link widoczny dla zalogowanych], voltmeter, watt combination (Figure 4). Circuit 4 (a) and around 4 (b), respectively wattmeter voltage coil connected and followed before the two ways, both the choice of wiring as described above. Irrespective of wiring, should be aware of: voltmeter and ammeter should be respectively watt coil and current coil voltage is directly connected. To accurately measure the results of measurement is required to amend, adopt Figure 4 (a) P = P when wiring a PwI-Pl = P12RwI +1 Rl where an ammeter ammeter internal resistance of a power loss Gu R 4 to Figure 4 (b ) connection mode T2TT2P = P '. PwV_Pv = one by one P-R power loss of a voltage meter voltage meter to test resistance to facilitate the measurement circuit can be further improved (Figure 5). Access in the circuit under test in two flexible connector (commercially available). Were used as voltage taps and current jack. Plug is inserted into the first two metal surface contact, the circuit normal conduction. 4, three tables will be set around the circuit sets the current New Zealand side branch access current plugs 1,2 are the inner and outer core. When inserted into the current jack ZK, the two metal sheets were opened and the plug, the outer core turns on, current flows through the combination of the three current branch table. Group of three tables in Figure 4, the circuit sets the voltage slip-side access New Zealand 3 solid plug or plug above the current internal and external short circuit as the voltage of the two core plugs,[link widoczny dla zalogowanych], when inserted into the voltage plug LZK2, the single point of the circuit under test contact, then electricity, Figure 5Z combination of the improved circuit of the three tables,[link widoczny dla zalogowanych], the wiring is simple, measured easily and quickly. And the state in the power circuit under measurement, this time in order to avoid current or pull the plug when wattmeter current coil and the ammeter the impact of New York at both ends in parallel 1,3-bypass switch. Can be inserted into the first bypass switch is closed. Combination of the three tables shorted current branch, the bypass switch off immediately after insertion, the normal test. In the measurement of electrical parameters can be inserted after the starting voltage, current plug to avoid the impact of the starting current of the instrument. Combination of the three tables can also monitor the load side of voltage and current. To the right choice using wattmeter voltage,[link widoczny dla zalogowanych], current limit, not according to the pointer to determine whether the full amount of partial restrictions are correct; so use Wattmeter AC circuits, regardless of the need to measure voltage, current, required to access voltmeter, ammeter monitoring of voltage and current is more than watt voltage and current range, the three tables can be easily combined to achieve this function References 1 Central China Normal University and so on. Electrical Engineering. Beijing: Higher Education Press, 19832. Jing-yuan. Ammeter voltage meter and power meter testing procedures reference Beijing: Publishing measured Du, 1985 ... ● _ ... ● ~ ■ ■ 【】 page 33 are connected to iron-nickel alloy I. = (0.03 ~ 0.06) nD (A) cold-rolled silicon steel sheet I = (0,3 ~ 0.6) zrD. (A) demagnetization line when I, ≤ 6A, the circuit in Figure 3; when I> 6A, the circuit in Figure 4. Then N should be open, so as to avoid too much damage induced potential calibrator and calibrator when the demagnetization current is only used to read the work, that is used to measure the excitation current 【demagnetization, = KI. Demagnetization in Figure 3, or when the connected lines in Figure 4, the regulator in the zero closing, adjust the regulator to make even gentle rise to the current I. = I (field winding N: 1 turn) and then dropped to zero uniformly smooth. Can be repeated 1 to 2 times. 4 Conclusion of a conventional electromagnetic tests, which can be used in small transformers and transformer equipment (such as precision transformer or converter or booster, auxiliary transformers and isolation transformers, etc.), according to the actual parameters need to re-design of the test applicable to Taiwan, a combination of special transformers. This not only reduces the cost of such equipment, but also applies to the special tests, while simplifying the test line. Easy to operate, the test results more accurate. For example,[link widoczny dla zalogowanych], the use described in this article dedicated measuring magnetic properties of current transformers with up-flow device, and transformer calibrator with Taiwan, it is easy to measure the iron-nickel alloy and cold-rolled silicon steel core full magnetization curve, and test results are accurate and reliable. References 1 Zhao Xiumin. ATT-type current transformer using garlic magnetization curve measured error of measurement. The motor industry. 1959 (5): 26 ~ 272 Machinery Industrial Research Institute of Shanxi Province calibrator measured by transformer magnetic core. Rinse with electric instruments, 1968 (10): 23 ~ 313 Zhao flea braces. The initial and maximum core frequency determination of permeability meter, 1992 (5): 22 ~ 254 Zhao Xiumin current transformer. Taiyuan: Shanxi Science Education Press, l99045 ・

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