RIV law. Partial discharge can produce the phenomenal early that radio disturbs to be known by people place. For example people often uses radio voltage to disturb appearance to as a result of,detect bureau put pair of radio news report and radio pilot to disturb, already established the standard of measurement technique. With RIV the watch detects bureau put slotted line way and pulse electric current measure a way continuously measure circuit likeness. In addition, still can use to receive coil to as a result of,be received bureau the electromagnetic wave that put and gives out, check object and different ambient conditions to differring, the central frequency that the amplifier that choose frequency can choose to differ (arrive from tens of thousands of hertz hundred thousands of hertz) , compare in order to obtain the biggest letter a confusion of voices. This kind of method already was used at checking the bureau of club of electric machinery line and the long cable that do not have screen layer to put position.
Light measures a way. Light measures Farley to use bureau the ray radiation that puts generation undertakes detecting. In transformer oil, the smooth wavelengh that all sorts of discharge give out is different, research makes clear it is normally between 500 ～ 700mm. The law is measured to come in lab benefit consumed analytic bureau put the respect such as feature and insulation deterioration had obtained very great progress, but because the optical equipment that measure a way is sophisticated costly, sensitivity is low, and needing material be detectinged is transparent to light, be in consequently actual in cannot apply.
Radio frequency detects law. Use Luo Guofu this base line circle is in from transformer neutral dot measure take signal, metrical signal frequency can achieve 30 thousand kilohertz to this, raise what end puts to measure frequency greatly, test system setup is convenient at the same time, detect the run mode that equipment does not change power system. But to transformer of three-phase electric power, gotten signal is the total that three-phase bureau puts signal, cannot undertake differentiating, and signal suffers outside interference easily. As the development of technology of digital filter wave, radio frequency detects the law is in bureau put online wider application received in detecting.
Ultrahigh frequency method is in bureau put the application in detecting
Muscularity of China north report learns to begin from 2002, put the bureau that in recent years the popular ultrahigh frequency technology on international applies at GIS, transformer, electric machinery and cable to wait detect research works. Up to now till, study the job obtained very great progress, finished ultrahigh frequency law to be used at transformer bureau to put detected feasibility test and verify, developed an automation ultrahigh frequency bureau puts testing system, the means control signal that can carry programmed control is collected and data stores. All sorts of lab models that designed bureau of imitate transformer interior to put, the means of the means that distributings through phasic statistic and spectrum had the research of pattern recognition, obtained very good result. Designed an ultrahigh frequency bureau that is based on the spot to put testing system for the foundation with laboratory testing system, the model that in Henan on Feburary 23, 2003 some transformer substation is running is successful ground SFPSZ9-220 kilovolt / 120000 kilovolt install advocate change had installation and test, realized home to experiment first with what check at actual and online installation. A string of 1 in this transformer the cover is checked again later during, installed the stationary that is based on signal of ultrahigh frequency demodulation to monitor a system to dog for a long time its bureau puts an activity. Combine the research positive result of the lab, designed to be based on labour to accuse the UHF bureau of machine to put online monitoring and warning device, came true online and successive the historical trend that collects analysis of data, phasic statistic and ultrahigh frequency signal to change along with time analyses a function.
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