There are many methods for current measurement, each suitable for different occasions, and each method has its own characteristics. This article introduces several commonly used current measurement methods and compares their respective characteristics. The Baijian test will answer for you and I hope it can help you
1. Electromagnetic current transformer
Electromagnetic current transformer is the most commonly used measuring equipment in the power system, with mature technology, low cost, and very high accuracy. It is currently the most commonly used measuring equipment.
. However, electromagnetic current transformers have many limitations:1. The difficulty of insulation, especially above 500kV, increases the volume, quality, and price of the transformer due to insulation 2. When the dynamic range is small and the current is high, the CT will experience saturation, which will prevent the secondary protection from correctly identifying the fault phenomenon
3. The output signal of the transformer needs to be laid with cables to the secondary equipment, and also needs to be converted into digital quantities through secondary conversion 4. CT open circuit can generate high voltage, endangering personal and equipment safety 5. It is prone to ferromagnetic resonance 6. The current transformer has high accuracy at the specified operating frequency, but it can adapt to a narrow frequency range, especially cannot transmit direct current. In addition, there is excitation current during the operation of the current transformer, so it is an inductive component and has the same drawbacks as a shunt
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