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Principle of system leakage detection
Jun 18 , 2020
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 illustrated system does not have a neutral line and is a three-phase...
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Principle and Application of Hall-effect current sensor
Aug 06 , 2020
The power factor correction (PFC) circuit and inverter circuit in the telecom rectifier and server power supply unit (PSU) all need to detect the current signal on the high-voltage side to the controller on the low-voltage side, so an isolated current sensor is used. There are many ways to implement isolated current detection, such as current transformers (CT), isolation amplifiers, and Hall effec...
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Realization of current detection in automobile electronic system
Aug 12 , 2020
Here mainly introduces the detection method of electric current, find some factors that are easy to be neglected in the design. First consider two different methods: the detection method based on the magnetic field and the detection method based on the shunt. 1. Magnetic field-based detection methods (represented by current transformers and Hall sensors) have many advantages, such as good isolatio...
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What is the difference in working principle between current transformer and voltage transformer
Sep 17 , 2020
Working principle of current transformer The working principle of the current transformer is similar to that of the transformer. The most critical difference with the voltage transformer is that under normal operation, the pressure drop on the primary and secondary windings is not large, which is equivalent to a transformer with a short-circuit fault condition. Therefore, the magnetic flux Ф in th...
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You can understand these simple voltage transformer common sense
Sep 17 , 2020
Regarding voltage transformers, in fact, many people don’t know about it. Although voltage transformers have always been near your friends and serve your daily lives, then the following is about voltage transformers. Detailed description. 1. The working principle of voltage transformer is introduced in detail The number of the voltage transformer is P.T, and the working principle of the voltage tr...
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A brief introduction to zero sequence transformer
Oct 28 , 2020
Zero-sequence current transformers are also called residual current transformers, ground current transformers or leakage current transformers. They are usually used in power fire protection equipment. When the power system generates zero-sequence grounding current, it is used in conjunction with the relay protection device for pre-protection Or monitor. The basic principle of the zero sequence cur...
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Triggering conditions for protection mechanisms of protective transformers
Mar 13 , 2022
The intelligent motor protector integrates the functions of measurement, control, protection, network communication, etc., and can protect the three-phase asynchronous motor. The modular design of the fully intelligent motor protector, the main controller and the display operation module are separated, according to the actual situation whether to use the display operation module. The product is sm...
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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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