The current transformer plays an important role in the electrical, so the requirements for some characteristics of the current transformer are also relatively high, in order to get used to the sensitivity and speed of electrical action.
1. According to the equivalent circuit diagram of the current transformer, the principle and characteristics of two kinds of current transformer ratio viewing experimental methods (current method and voltage method) are discussed, and a simple and reliable current transformer ratio viewing field experiment method is introduced-voltage method.
The field ratio inspection experiment is always listed as an important experimental item when the current transformer is metamatized and after the winding is replaced. Although the accuracy of the current transformer ratio should be ensured by the production department, due to various reasons, errors can occasionally be detected during field experiments (most of which are caused by taps). Therefore, the field variable ratio viewing experiment has become a constant project for many years.
The working principle of the current transformer is roughly the same as that of the transformer, the difference is that the alternating main magnetic flux in the transformer core is generated by the communication voltage at both ends of the primary coil, while the alternating main magnetic flux in the core of the current transformer is generated by the current in the primary coil, and the primary main magnetic flux induces the secondary potential in the secondary coil to produce the secondary current.
From the working principle of the current transformer, it can be seen that the ratio of the transformer to the transformer ratio is the ratio of the number of turns of the primary coil to the number of turns of the secondary coil, and the main reasons affecting the ratio error of the current transformer are: (1) the magnitude of the current, the ratio difference and the angular difference increase with the decrease of the secondary current; (2) The size, specific difference and angular difference of the secondary load decrease with the decrease of the secondary load; (3) The power factor of the secondary load, with the increase of the power factor of the secondary load, the specific difference decreases and the angular difference increases; (4) the influence of power supply frequency; (5) Other elements. The internal parameters of the current transformer may also cause ratio errors, such as the impedance in the secondary coil, the core cross-section, the core data, the number of turns of the secondary coil, etc., but this is determined by the design and production.
Error experiments on current transformer changes should be completed by the manufacturer at the time of the factory experiment or carried out in the laboratory. However, the field experiment of the current transformer ratio belongs to the nature of viewing, that is, the key points are to check the turns ratio without considering the above-mentioned reasons that affect the current transformer ratio error. According to the electrotechnical principle, the turns ratio is equal to the reciprocal of the voltage ratio or the current ratio. Therefore, both the measured voltage ratio and the measured current ratio can be used to calculate the turns ratio. Sick grating intelligent and dedicated life.
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