Correct use and maintenance of transformer verification

The verification of the correct use and maintenance information: transformer produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Transformer verification measurement accuracy is not high, but because of its working circuit is more complex, a series of technical characteristics, in particular, it calls for verification or measure, must be used correctly. One, the influence of the external magnetic field in transformer verification experiment. More flow meter manufacturers choose model price quote you are welcome to inquire, here is a transformer verification details correct use and maintenance of the article. Transformer verification measurement accuracy is not high, but because of its working circuit is more complex, a series of technical characteristics, in particular, it calls for verification or measure, must be used correctly. One, the influence of the external magnetic field in transformer verification lab, relating to, measuring equipment and power supply equipment even for large current current-carrying conductor must carry on the reasonable layout, otherwise, will make the transformer verification produces large error. In general, at least let transformer check leave flow device with large current conductor is not less than 3 to 15) Meters. Second, the connection mode and checked the standard transformer transformer connected to the transformer verification, you must first ensure correct wiring of polarity. Otherwise, from taking differential circuit of signal may not have two current ( Or voltage) The difference between the, but two current ( Or voltage) Check sum, easy to transformer burn out. Second, must also consider the discretion of the transformer potential client. For current transformer, only when the primary circuit in the L1 side and the secondary circuit of K1 and was close to the ground potential, measuring its from the L1 injected current and output current from the K1 end, on behalf of the real error of the transformer. For voltage transformer, the X client and X client at low potential, and A end with Q end at A high potential, according to the JJG314 - 1994 procedures, when the test will be a standard transformer were found in a side and transformer end short connect together, and in both take second level voltage difference between the X client. If the polarity at the potential to reverse, may cause leakage error. For the current transformer and voltage transformer, the high accuracy ( For example, 0. 05 level above) , the influence of the factors is more obvious. But in 0. Below level 1 transformer experiment, effect is relatively weak. Third, grounding problem is a method to reduce the influence of leakage current. Verification in the transformer transformer verification or impedance admittance measurements made, both current transformer and voltage transformer, consider will remain the state of low potential transformer verification circuit, reduce the leakage current to the ground. For current transformer, however, the difference comparison method is adopted to improve the verification, and does not allow the K1 end grounding directly, thus to choose reasonable according to the actual situation of the specific circuit ground. In order to make the grounding measures are effective, when use transformer verification for verification or measurements, be sure to set the panel to the grounding terminal is reliable. In order to reduce current transformer primary circuit for transformer verification of leakage current, also want to primary circuit grounding measures. In general, when the primary rated current is greater than 1 a, can either side of the earth in the primary circuit. But when the primary rated current is greater than or equal to 1 a, according to the JJG313 - 1994 of the regulation, should adopt symmetric branch of the measures to realize the virtual ground. Of course, some weak current transformer in the circuit itself sets the auxiliary circuit and allow direct grounding, thus reducing the operational problems. Four, range checking instrument function is more, reasonable selection of transformer when use must function switch right, range to choose. Otherwise easy to cause unnecessary human failure. Verification, for example, the rated secondary current of 1 a current transformer, if he puts the range of the transformer check 5 a position, it is easy to make the participants current transformer with the standard current transformer overload 5 times, this is very dangerous. For the verification of voltage transformer are also in a similar situation. Five, the load matching error characteristics of current transformer and voltage transformer for load impedance ( Or admittance) Is very sensitive, if choose not to load matching, is likely to produce, or make the client in the standard process of transformer phrase. Therefore, to access transformer verification standard transformer and checked transformer impedance ( Or admittance) Matching, that is, to make the test circuit is to the actual load is equal to the transformer in the specified in the technical conditions of rated load. Due to the transformer circuit verification have already constitute a part of the load to the transformer, so need to verification of transformer circuit ( Including wire) To load ( The impedance and admittance) The test. Then, combined with the actual data of the current load box or voltage load boxes, with proper parameters of wires are accurately after the match, will work. Six, the polarity test before the formal verification error, should first check the polarity of right and wrong, if the wired way right, still found polarity indicator action, suggests that checked transformer internal polarity has a problem, otherwise should be test again.

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