The general current transformer can convert the primary current with a large value to a secondary current with a smaller value according to a certain transformation ratio, so that it can be used for maintenance and accurate measurement. The main function of the zero-sequence current transformer is to protect the operation and disconnect the switching…
Most technicians are very familiar with the GFCI sensor for ground fault current detection.The detection principle is as follows: In a three-phase system, a chip-type RCMU (leakage current monitoring unit) is placed on the bus. The most important thing is that all three buses pass through the middle hole of the RCMU randomly. The…
1. The basic function of current transformersThe current transformers can convert primary currents with larger values to secondary currents with lower values through a certain transformation ratio, which are used for protection and measurement purposes. For example, a current transformer with a transformation ratio of 400/5 can convert the actual 400A current to 5A current.2.…
Brief description Principle The main characteristics of RCD are shown in the below picture. Its iron core surrounds all current-carrying conductors of an electrical circuit, and the magnetic flux generated in the magnetic core is related to the arithmetic and current of these conductor currents in an instant; the current flowing in one direction is…
The Critical Impact of Open Circuit Conditions in Current Transformers Current transformers (CTs) are indispensable in the measurement and monitoring of electrical currents in various applications. Understanding the impact of open circuit conditions on these devices is crucial for maintaining safety and reliability in electrical systems. How Current Transformers Operate A current transformer typically features…
Before talking about accuracy and linearity, let us talk about the concepts of several errors: 1. Absolute error: the difference between the measured value and the ideal value; 2. Relative error: the ratio of the absolute error of the measured point to the ideal value of the measured point; 3. Reference error: the ratio of…