With the development of reformation in power system and the startup of reconstruct project of the network, the power supply enterprises must have the commercialized reformation that include the production and management mode in order to supply good service for the electric energy producer and user openly and fairly. The main content of the project is the system that every urban household shoul...

With the more and more high demand and deep study on the power quality, it asks for more and higher demand to the power quality analyzer: it should not only has the ability to comprehensively analyse power quality indexes, but also has the linking net and mass storage functions, the two functions not only can conveniently measure, analyse and govern the power quality from extensive scope, but ...

Vibration measurement is an essential part of the detecting system to monitor systemstatus and diagnose fault. It has become indispensable in the automation production. Soeffectively measures and analyses various vibrations are practically significant. In this paper,we carry out a vibration measurement system based on CCD imaging sensor. There are aserial of works in which CCD imaging sensors ...

The test of the electric field intensity is always very important in electronics and electro-techniques. The traditional measure equipment of the electric field may change the field so that measure precision and safety may be affected. But these shortcomings can be conquered by the techniques of fiber optic sensing.The system of fiber optic transmission and intelligent test for the signal of e...

Grounding the power system is an important issue,Ground will have a direct bearing on electrical equipment and personal Security.The accuracy of grounding resistance measurement is directly related to the correct judgement of the network of ground construction quality, and the grounding in the operation of the network .So increasing the accuracy of ground resistance measurement is very import...

The technique administrative of electric energy metering device is important work. The electric energy metering device includes the all kinds of the watt-hour meters and the potential transformer and the current transformer and the secondary circuit and theelectric energy metering case. The main administrative work is to periodically check-up the state of devices.To distinguish connect station...

As one of the most common equipments the engineers use in research and development, the oscilloscope has been widely used in project measurements. The Digital Storage Oscilloscope(DSO)has become one of the most fast-developed equipments because of its proper characteristics.With the enhancing requirements on speed, precision and intelligence in modern measurement, traditional measuring instru...

With the increasing popularization of the electric energy meter, the high performance energy metering IC have been applied in electric automation system widely. Actual energy metering IC mainly uses sigma-delta ADC to convert the voltage and current signal collected by instrument transformer to digital signal. This ADC adopts oversampling、 noise-shaping and digital filtering technique. It ha...

With the development of the power and electronic technology, the harmonic problem from the power and electronic devices have a potential threaten to the safety, stability and economical operation and a very bad influence to the electrical environment around. The source of the harmonic wave in the power system mainly comes from all kinds of nonlinear devices.The efficiency of the devices which ...

In this paper, a real time power spectrum analysis of low frequency radom signal based on digital filters is introduced, and a design way of real time arithmetic is given. The correlation method and FFT method of the power spectrum estimation could not completely reflect the concept of the power spectrum of the non-stationary random signals because of data truncation. And the method of parame...