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Current transformers occupy a vital part of the measurement and protection system for any electrical installation. Therefore, it is imperative that the choice of CT performed with full knowledge of programs and number of relays and meters to be connected to a network. A current transformer with the wrong load rating or the wrong class of accuracy would seriously compromise the performance measurement and protection system. Calculating the burden of a Current Transformer. The burden of the current transformer indicates in its nameplate. The burden is assessed in VA. If 15VA or 25 VA. VA has indicated Rated load transf?mat? can take. Current transformer is connected by wires to a measuring instrument or protection relay. The load by the current transformer is connected, and the impedance of the connecting wires, which connect. Shall have the right to charge the device to be found in the datasheet to the manufacturer's. The total burden is the sum of the burden of connected devices and the resistance of the wires. Inductive component of the resistance of the wire is usually neglected, as it is minimal. The burden of the current transformer may increase over time as the resistance of connecting wires may slightly increase due to age, changes in temperature and give the connection. Therefore, the CT will never be filled with 100% capacity. Current Classification TransformersDepending on their applications, current transformers can be divided into measurement and protection current transformers. Measuring transformers high accuracy. However, they have a low saturation temperature. They are so deliberately, so that measuring instruments are not damaged by high fault currents. In case of error given the transducer and the output remains saturated in the field of measuring instruments. Transformers are classified as 0. 1.0. 3, 0. 5, 1. Values ??indicate the percentage error in the primary rated current. So a 100 / 5 CT with 0. 3 Accurate has a maximum error of 0.. 3100 primary when the. The current transformers used for protection, has less accuracy compared to measuring current transformers. They have very high saturation limit. This is necessary because they need to continue current sensors even at high error values. Protection of transformers are classified as 5P10, 10P10, etc.. The first letter in the notation indicates the maximum percentage error. The last digit indicates how many times the rated currentClick here for more similar articles
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