Correct use and maintenance of transformer calibrator

Abstract: The correct use and maintenance information of the transformer calibrator is provided by the excellent flowmeter and flowmeter manufacturers and quotation manufacturers. The measurement accuracy of the transformer calibrator is not too high, but due to its complex working line, especially its series of technical characteristics, it is required to be used correctly during verification or measurement. First, the influence of external magnetic field in the experiment of the transformer calibrator. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the details of the correct use and maintenance of the transformer calibrator. The measurement accuracy of the transformer calibrator is not too high, but due to its complex working line, especially its series of technical characteristics, it is required to be used correctly during verification or measurement. 1. The influence of external magnetic field In the laboratory of the transformer calibrator, the relevant measuring equipment and power supply equipment, and even the current-carrying wires with large currents, should be reasonably arranged, otherwise, the transformer calibrator will produce a large amount of electricity. error. Generally speaking, at least keep the transformer calibrator away from the current riser and the high-current conductor at a distance of not less than (3-15) meters. 2. Wiring method When connecting the standard transformer and the tested transformer to the transformer calibrator, the polarity of the wiring must be correct first. Otherwise, the signal obtained from the difference circuit may not be the difference between the two currents (or voltages), but the sum of the two currents (or voltages), which is easy to burn out the transformer calibrator. Secondly, the high and low potential ends of the transformer must also be considered. For a current transformer, only when the L1 terminal in the primary circuit and the K1 terminal in the secondary circuit are close to the ground potential, the current injected from the L1 terminal and the current output from the K1 terminal are measured to represent the mutual inductance. true error of the device. For the voltage transformer, its X terminal and x terminal are at low potential, while A terminal and Q terminal are at high potential. According to the JJG314-1994 regulations, the a terminal of the standard transformer is connected to the tested transformer a during verification. The terminals are shorted together, and the difference in the secondary voltage is taken between the X terminals of the two. If the polarity of the potential terminals is reversed, leakage errors may occur. For current transformers and voltage transformers, when the accuracy is high (such as above 0.05), the influence of this factor is more obvious. However, when the test is performed on transformers below 0.1, the effect is relatively weak. 3. Grounding Problems Grounding is a method to reduce the influence of leakage current. When the transformer calibrator is used for the verification of the transformer or the measurement of the impedance admittance, no matter for the current transformer or the voltage transformer, it should be considered that the circuit of the transformer calibrator is always in a low potential state to reduce its Leakage current to ground. However, for the current transformer, when the difference comparison method is used for verification, it is not allowed to directly ground its K1 terminal, so a reasonable grounding point should be selected according to the actual situation of the specific circuit. In order to make this grounding measure effective, the grounding terminal button set on the panel must be grounded reliably when using the transformer calibrator for verification or measurement. In order to reduce the leakage current generated by the primary circuit of the current transformer to the transformer calibrator, grounding measures should also be taken for the primary circuit. In general, when the primary current rating is greater than 1A, it can be grounded on either side of the primary circuit. However, when the primary rated current is greater than or equal to 1A, according to the provisions of JJG313-1994, the measures of symmetrical branches should be used to realize the virtual ground. Of course, some weak current transformers set up auxiliary grounding points in their own circuits and allow direct grounding, which reduces the trouble in operation. 4. Reasonable selection of range The transformer calibrator has many functions. When using it, the function switch must be selected correctly, and the range must be selected accurately. Otherwise, it is easy to cause unnecessary human failures. For example, when calibrating a current transformer with a rated secondary current of 1A, if the range of the transformer calibrator is set to the position of 5A, it is easy to make the tested current transformer and the standard current transformer produce 5 times the difference. Overload, which is very dangerous. Similar problems also exist for the verification of voltage transformers. 5. The error characteristics of the load matching current transformer and voltage transformer are very sensitive to the load impedance (or admittance). If the load selection does not match, it is likely to cause misjudgment, or make the tested transformer in the standard transmission process. Inaccurate. For this reason, impedance (or admittance) matching should be carried out on the standard transformer connected to the transformer calibrator and the tested transformer respectively, that is, the actual load borne in the calibration circuit should be equal to the technical conditions of the transformer. rated load specified in . Since the relevant circuit of the transformer calibrator has already formed a part of the load for the transformer, it is necessary to test the internal load (impedance or admittance) of the relevant circuit (including the wire) of the transformer calibrator first. Then, combined with the actual parameters of the current load box or voltage load box, after accurate matching with connecting wires with appropriate parameters,can work. 6. Polarity test Before the formal verification error, the correctness of the polarity must be checked first. If the connection method is correct and the polarity indicator is still found to work, it means that there is a problem with the internal polarity of the tested transformer, otherwise it should be checked. Test again. If the measurement line is normal at this time, it means that the polarity of the tested transformer is reversed. This step must not be omitted, otherwise it is easy to cause human accidents. 7. The secondary open circuit of the current transformer For general current transformers, the number of turns of the secondary winding is very high. Under the condition of working with rated current, once the secondary open circuit occurs, it will cause a lot of damage to the secondary winding. High open-circuit voltage endangers equipment and personal safety, so during the current transformer test, it is forbidden to open-circuit under rated current.

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