With the development of computer technology, virtual instrument has been an important developing direction of power parameter measurement. This paper briefly introduces the significance and current situation of power parameter measurement, points out existing deficiencies of traditional power parameter measurement, puts forward and develops a virtual compositive test system for power parameter...

Electricity is one of the most important energy sources, and the quality of electricity is nearly correlative with our lives. However, as the fast development of power electron technology, and the diversified equipment of power electron, home electrical instruments and other no-linear charges greatly increase, harmonics contamination of power system increases severity, and badly affects the qu...

The multi-rate electric charge policy is broadly used in our country during these years. It can effectively ease the situation of power emergency, and regulate the electric power load curve. Civil aviation enterprises and factories consume a great part of the annual electricity supply, by positively adopting the multi-rate policy, will not only be helpful to the target of peak shaving and val...

Because of the reform of electric power market, the anomaly of electric energy metering device is value by people more and more, but the surveillance to electric power metering device originally already hasn’t adapt the situation. Therefore, the paper put forward topic that studies information-based monitor system for anomaly of electric energy metering device. At first, the paper analyzed v...

At present, the Time and Frequency System of high accuracy which contains many atomic clocks builds and keeps a time scale according some algorithm. And the atomic clock has to be in a good state. The Atomic Clock Performance Analysis Platform Software is a tool of evaluating the run-state of clocks. And it is one important part of the Atomic Clock Time and Frequency System, and is also the pr...

This paper presents a new type of temperature-compensated crystal oscillator, which is based upon the crystal resonator force-frequency characteristic. Introduces the traditional temperature compensated crystal oscillator, such as TCXO, MCXO and DTCXO, and the development of temperature-compensated technique. Specify the major steps in the fabrication flow of a crystal resonator.On the basis ...

A design of spectrum analyzer based on Visual Instrument (VI) technology is introduced in this paper. The spectrum analyzer has the same functions as a traditional spectrum analyzer, and also has a customized, friendly user interface. Its main functions include: 1) signal real-time display in time scale; 2) signal real-time power spectrum display in frequency domain; 3) filter, with an option ...

As harmonic contamination is increasingly severe, the introduction of active power filter (APF) is an important development trend. The analog control method of APF is not flexible and the precision is not perfect. With the rapid development of low price and high performance DSP technology, digital control method is replacing the traditional anolog control method, so this dissertation mainly re...

The electric systems are seriously threatened by flashover of iced and contaminated insulators, which are caused by leakage current (LC). The change and development of LC is one of the main decisive factors of flashover. Inspecting the change and development of LC during the icing flashover and contamination flashover can help to analyze the mechanics of insulators and the developing process o...

With the development of science and technology, the phase measurement technique has gone deep into many fields and departments and it requires more and more precised.The purpose of subject is to achieve the phase difference measurement of two 50 Hz sine signals. Based on the further analysis about all kinds of phase measurement system, the research of phase measurement system for 50 Hz sine s...