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Inspection of factory current transformers and resolution of abnormal instances
Mar 13 , 2022
1. Items to be checked when the current transformer is regularly inspected. How to correctly judge whether there is a fault and how to deal with it. What are the common faults of current transformers? Common faults of current transformers are: 1. The secondary side of the current transformer is open circuit 2. The temperature of the current transformer is too high during operation 3. There is smok...
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The basic concept of zero-sequence current protection
Mar 13 , 2022
The basic concept of zero-sequence current protection is based on Kirchhoff's current law: the algebraic sum of the complex currents flowing into any node in the circuit is equal to zero. When the line and electrical equipment are normal, the vector sum of the currents of each phase is equal to zero. Therefore, the secondary winding of the zero-sequence current transformer has no signal output, an...
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The Function of Current Transformer and How to Handle Its Common Malfunction
Jun 17 , 2022
The current transformer is based on the electromagnetic inductionprinciple. It is composed of closed iron core and winding. The turns of its first winding are very small, stringed in the circuit whose current needs to be measured. Thus, it is often flowed through by the full-load current of the line. The turns of its second winding are much than the former,&...
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Usage Principle of Current Transformer
Jun 17 , 2022
1)The wiring of the current transformer should follow the series principle: the primary winding should be connected in series with the circuit under test, while the secondary winding should be connected in series with all loadded instruments. 2)Selecting appropriate transformation ratio according to the measured current, otherwise the error will be larger. At the same time, one side of the se...
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Three main parameters that interfere with the accuracy of Rogowski coils
Jun 18 , 2022
Electronic current transformers are based on Rogowski coils with small size, light weight, wide frequency band, factors that more or less affect the accuracy of the coil in the measurement operation, such as the size of the circuit conductor under test relative to the coil, and external electromagnetic interference. , The circuit under test has the advantages of large conductor volume range, no ma...
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Analysis of Magnetization Curve of Ferrite Core for Transformer
Jun 18 , 2022
Ferrite is a material that is relatively cheap in magnetic materials, and has good magnetic permeability and magnetic saturation strength, so it is now used in many current transformers, and in open-close current transformers, it is often based on customers. Therefore, we choose ferrites of different materials, such as PC40 and high-conductivity ferrite. We know that PC40 has a certain magnetic pe...
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Leakage protection can save lives, The installation of this type of inductor must be clear
Jun 18 , 2022
1. Residual current transformer wiring Before installing the residual current transformer, it is necessary to identify the phase line, N line and PE line in the power network. The phase line and the N line should pass through the residual current transformer together as much as possible, and the PE line should not pass through the transformer. In the system software, if the N line does not pass th...
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Current transformer selection points
Jul 19 , 2022
Current transformer selection points: (1) The rated frequency of the current transformer should be consistent with the current frequency of the line under test. (2) Select the rated voltage of the current transformer according to the voltage level of the line under test to ensure the safety of the staff and the instrument. Never use a current transformer with a lower rated voltage to measure line ...
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