Many non-linear loads are used in normal life and industry recently, along with more and more modern equipments of industry and civil electronic instruments are used. It is polluting our electronic web more and more badly. It has an impact on the high running of the city economic and the life quality of people. The users and the electronic web fell across some abnormal accidents that were caus...

Intelligent instrument is a kind of intelligent measuring and controlling system that combines computer technology and measuring and controlling technology with MCU being its main body. Intelligent instrument has many strongpoints which tradional instrument hasn’t, such as automatic operation, data processing and friendly man-machine conversation function. So, it can be applied widely in all...

With the rapid development of modern industry and widespread application of power electronic devices, harmonic pollution is becoming more and more serious, which has a serious negative impact on the power quality as well as the normal operation of various electrical equipments. Harmonic detection is the main aspect of harmonic problem research. Real-time and accurate detection of harmonic qua...

Electrical energy is main energy sources of country economy and people\’s life. The characteristic of electric power production is that power plant generates electricity, transmission department transmits electricity, distribution department distributes electricity,consumer consumes electricity. These four sections to connect a system, complete at the same time. How to sell and purchase ...

The Digital Oscilloscope has perfect functions, higher indicators.How to ensure its accuracy in accordance with the law,is of great significance to guarantee the effectiveness of search and production test data.There are two problems need to be solved:First, according to the characteristics of Digital Oscilloscope and measured technical parameters, how to select the test items, formulate an a...

In the development of industry, mineral is important and can’t be replaced. But the superficial mineral was limited, after some years’excavation, they can’t satisfy the need any more, so we must search the deep-seated mineral. However, the instrument we used now can’t complete this new task, so the more powerful instruments should be designed and produced. The 3-components flux-gates ...

In recent years, the electrical harmonic pollution is getting more and more serious with the far-ranging application of power electronics technologies. It has become a curse to power system, which deteriorates the quality of electric energy. Active power filter (APF) is an advanced power electric device, which can be used for integrated compensating harmonic. Compared with some conventional me...

With the development of electric power industry and the expanding of many towns,220kV transmission lines have been becoming the main grid of most cities. Inevitably,500kV transmission lines which located in the suburbs enter the towns, and the highvoltage electric substations along with the high voltage transmission lines emerged inthe residential area. The electromagnetic pollution to the nei...

Portable Multifunction Wide-Range Testing Meter is a research project of JiangXi GanZhou Power Company. It is designed for testing various electric parameters. Traditionally, We need several testing meters to test all these electric parametes, such as universal meter, etc. While with this testing meter, we got all this functions together, It saves money and reduce maintaining time. After analy...

In recent years, with the development of power electronics technology, many kinds of power electronics devices are widely used. On one hand, they made power energy transformation and application conveniently; on the other hand, they lead to serious reactive power and harmonic current pollution in the power system. Active power filter is a new power electronic device which can effectively comp...