|| 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 HRJFD-2A 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 HRJFD-2A 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, Shengyang
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 HRJFD-2A 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 HRJFD-2A 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
(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
(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
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
Minimum positional error:＜50mm(laboratory)＜ 250mm (spot)