高壓檢測設備NAJF局部放電超聲自動定位系統。國家“七五”重點科技攻關項目“大型變壓器局部放電超聲定位方法及裝置的研究“課題中研制的NAJF-03系統為解決這一問題提供了有效手段。
NAJF-03局部放電超聲自動定位系統，先后在葛州壩500kV開關站、武漢鳳凰山500kV變電站、上海變壓器廠、合肥變壓器廠、武鋼等處對數百臺變壓器，電抗器進行局部放電超聲測量。
NAJF-03 automatic positioning system for PD discharge
*以來，運作中大型變壓器的故障檢測及定位始終是電氣工程師們關注的焦點問題。國家“七五”重點科技攻關項目“大型變壓器局部放電超聲定位方法及裝置的研究“課題中研制的NAJF-03系統為解決這一問題提供了有效手段。
NAJF-03系統先后在葛州壩500kV開關站、武漢鳳凰山500kV變電站、上海變壓器廠、合肥變壓器廠、衡陽變壓器廠、廣州*、武漢*、湖南*、重慶變壓器廠、武鋼等處對數百臺變壓器，電抗器進行局部放電超聲測量。該系統工作可靠、操作方便，滿足測量要求。作為電力部“八五”重點推廣項目之一，目前該電裝置已廣泛應用于東北、華中、華東、華北和西北等有關單位的電力測試研究及現場測量。
NAJF-03超聲定位系統集高性能計算機、高靈敏度局放聲測探頭、程控放大濾波、高速A/D轉換器、瞬態波形記錄、信號分析、故障定位計算機軟件于一體，適用于大型變壓器和充油高電壓電器設備以及GIS和其他電力運行設備中局部放電超聲信號的采集、測量、分析和定位以及在線監測。
NAJF-03超聲定位系統對通常產生的變壓器圍屏、引線、金屬件及高壓線圈表面的放電能迅速判明故障位置。定位誤差小于250mm，整套測量系統能檢測出小于1000pC局部放電量的超聲信號。
功能與特點：
1、基于Windows平臺下的軟件，使局部放電超聲波探測的操作、分析更簡捷。
2、超聲波傳感器具有低噪聲、高靈敏度和抗干擾性能，使信號的獲取更可靠。
3、具有局部放電超聲波信號的電-聲定位和聲-聲定位功能，使現場測量更靈活。
4、任意選擇超聲波信號的球面定位計算或雙曲面定位計算，使定位結果更精確。
5、用立體幾何圖形展現超聲波探頭和定位點的坐標位置。
6、方便建立測量和定位的數據庫，便于進一步分析和管理。
7、本儀器還可以作為局部放電在線監測儀使用，可監測電力設備的局放產生和發生發展。
技術參數：
超聲探頭靈敏度：-150dB
輸入通道數：6/8
A/D轉換精度：8bit±1/2LSB
采樣長度：32k/通道
zui小可測放電量：＜50pC(實驗室） ＜300(1000)pC（現場）
zui小定位誤差：＜50mm(實驗室)＜ 250mm（現場）
NAJF-03 Type Local Discharge Ultrasonic Automatic Positioning Device
The failure testing and positioning of operating the medium and large sized transformers have always been the points that electrical engineers focus for a long time. The NAJF-03 system, manufactured in the large-sized transformer local discharge ultrasonic position method and equipment research subject which is one of the national key scientific and technological project has provided an effective solution.
The NAJF-03 system has carried the ultrasonic measurement to the local discharge of the hundreds of transformers and reactor in Gezhou Dam 500kV switch station, Wuhan Phoenix Mountain 500kV transformer substation, Shanghai transformer factory, Hefei transformer factory, Hengyang transformer factory, Guangzhou power supply bureau, Hunan electricity generating board, Chongqing transformers factory and Wuhan steel. This system has the advantage of operation reliable and easy to operate. It can meet the needs of measurement. As one of the key items of the of eight-five project, this electrical device has been widely used for the spot test and research in the related unit in the north, east, central and northwest parts of China.
The NAJF-03 ultrasonic positioning system which is including the high performance computer, high-sensitivity local discharge sound probe, programmed amplified filter, high-speed A/D transducer, transient waveform recording, signal analysis and fault location software is applied for acquiring, measuring, analyzing, positioning and spot observing the local discharge ultrasonic signal in the large-sized transformer, oil-immersed high voltage electrical apparatus and the GIS electrical operation equipment.
The NAJF-03 ultrasonic positioning system can position the fault and the error is less than 250mm. The whole measuring system can find out the local discharge ultrasonic signal which is less than 1000pC.
Functions and characteristics:
(1) Making the detecting operation of local discharge ultrasonic more convenient and the analyzing more simple under the platform of the windows.
(2) Making the signal acquired more reliably for the ultrasonic sensor has the performance of low noise, high-sensitivity and anti-jamming.
(3) Making the spot testing more flexible with the local discharge ultrasonic signal electrical-acoustical position and acoustical-acoustical position functions
(4) Making the result of the position more precisely by choosing freely the spherical position calculation and the hyperboloid position calculation of the ultrasonic signal.
(5) Showing the position coordinates by ultrasonic probe and the locating point by solid geometric drawing.
(6) Convenient for building the measuring and positioning database for further analyzing and managing.
(7) Be the local discharge on-line detecting instrument which is useful for detecting the local generating and developing.
Technical parameter:
The sensitivity of the ultrasonic probe: -150dB
A/D conversion accuracy: 8bit±1/2LSB
Sample length: 32k/channel
Minimum detectable discharge:＜50pC (laboratory)＜300(1000)pC (spot)
Minimum positional error:＜50mm(laboratory)＜ 250mm (spot)
