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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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Selection of residual current device in EV charging pile / module
Jun 17 , 2020
With the explosive growth of the number of new energy vehicles in the past two years, the construction scale of its supporting facilities and charging piles has also expanded. The growth of the new energy vehicle market is inseparable from the construction of basic charging facilities. How to ensure the safety of electricity used in the charging process, especially to prevent the leakage current f...
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Miniature current transformers
Jun 09 , 2020
Miniature current transformers are divided into miniature current transformers (including miniature current transformers) and miniature voltage transformers. It is a device in the power industry and is generally used in various power instruments for measurement and protection. Compared with ordinary transformers, micro-transformers have a smaller size (the size of fingernails can be achieved) and ...
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Choose a good DC immunity current transformer cores
Jun 09 , 2020
DC immunity current transformer Applications Electronic electricity meter Product Features 1 S type closed-loop magnetic circuit: low sensitivity to interference sources, usually no shielding requirements. 2 Working principle of electromagnetic conversion, no semiconductor device: High reliability, only few additional circuits are needed 3 Simple assembly with only a few components: low assembly c...
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The difference between current transformer and zero sequence current transformer
Jun 09 , 2020
1. The basic function of current transformers The 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. Working principle o...
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How to DIY your home energy monitor with ZENTAR CT?
May 25 , 2020
1.What you need to buy? Split core current transformer from Zentar(CT313@100A) Mircocontroller Display Resistors Capacitors Protoboards Headphone jacks 2.Design a case by one-time 3D printer 3.Design a system to ingest data from energy monitors 4.Archiving data 5.Calculate the consumption in total 6.Arduino sofeware 7.Install current transformer 8.Expose data 9.Develop app 10.Read the datas and en...
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How to use display advertising to break through traffic bottlenecks and build your own current transformer brand?
May 24 , 2020
How to use display advertising to break through traffic bottlenecks and build your own current transformer brand? 1.Cartoon with different type and visual figures Case study: 7 reasons why you need to work with titoma https://www.youtube.com/watch?v=ydLXCJSvGNU 2.Talk our split core current transformer by your client Empathy Case: KEY SMART From the perspective of the customer, from little boy to ...
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What is the effect of current transformer in open circuit condition
May 23 , 2020
The current transformer, CT, has fewer primary winding turns. When using, the primary winding is connected in series in the circuit under test, and the secondary winding has more turns. It is used in series with the current coils of measuring instruments and relays. ,So the CT is close to short circuit during normal operation. The magnitude of the CT secondary current is determined by the primary ...
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Analysis of current transformer voltage output
May 23 , 2020
Current-type signals, the external characteristics of the ideal situation, is equivalent to a very large voltage source in series with a very large internal resistance. In this way, when the load impedance is much smaller than its internal resistance, the current is always equal to its "short circuit current". Its main advantages are: as long as the resistance of the transmission line and the cont...
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Several basic concepts about accuracy and linearity
May 21 , 2020
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 the absolute error of the measured point to the reference value (range); 4....
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