Our country is vast, the development of electric power resource and power consumption is extremely unbalanced. The distance between electric power and power load centre is gradually increasing. And highly efficient energy-saving, safe and reliable ultra-high voltage (UHV) transmission technology has been put to the agenda. China Electric Power Research Institute (Beijing) constructed the coun...

In practical application of partial discharge on-line monitoring system inpower transformer based on UHF method, we found the valve has much impact todetection. The paper studies the characteristic of UHF wave in the pipe in case ofbutterfly valve. UHF signal was decayed and distorted a lot when it passed metalvalve plate. The metal pipe is high pass filter. We design the on-line installation...

To solve the Petersen coil grounding system after the failure of the arc suppression, making capacitive current online tracking measurement, this paper analyses various operating modes, then design the electronic tapping point

In order to get more knowledge of the propagation and attenuation characteristics of theUHF signals in GIS, to economize the UHF sensors in GIS station, this paper use experimentaland emulationalmethodtoanalyzethepropagation characteristicsof the UHFsignalsin GIS.First of all, the XFDTD software is used to model straight cavity, Tshape corner, insulator,line breaker, In this way, the general ...

Because power transformer in electric power system is one of the best key equipments, on-line partial discharge (PD) monitoring of power transformer to prevent insulation paroxysmal accident of power transformer has very important value and has become a hotspot in research. Field acquisition PD signal has the strong interferences Because of a great amount of electromagnetic interferences in o...

In recent years, with the improvement of capacity and voltage-level of HV equipments, it becomes more and more important to keep HV equipment safely running in employed years. In addition, insulation aging takes most of proportion of HV equipment accident. Therefore, to keep HV equipment in good condition, firstly, it should keep insulation in good condition. Then, we need a way that can measu...

Large transformer is one of the most important apparatus in power system. The main insulation of large transformer is always subjected to the thermal, electrical and environmental stress during the long-term operation. So partial discharge takes place in the weak parts, gradually developed and resulted in the aging of insulation. It is very significant for measuring partial discharge (PD) to e...

For high voltage(HV) on-site testing, the AC frequency-tuned series resonant test system(ACRF system) have been recognized to be the most cost-effective and only practicable solution because of the advantages of the ACRF system: a very good weight-to-test power ratio and very low power demands. The ACRF system is tuned into resonance with the test object by a voltage of variable frequency supp...

With the development of electrical industrial, XLPE has been used widely because of its superior electrical and mechanical property. In order to ensure the safety of transmission network, detection of XLPE has been paid great attention, and the on-line monitoring and location of partial discharge occurred in XLPE become one of the issues of general interest.Based on the transmission characteri...

The security of service is a focal point in the mind of the worker and manager of power system. The periodical inspection is the important tache in the routine work of power system and using ground wire is the important method to ensure the security of inspection. It is a desiderate-solved problem to improve the using reliability of the ground wire. In order to realize the real-time monitor a...