---Approved by the Awarding Committee
of Dayu Water Resources Scientific and Technology Awards,
HRC's "Digital Electric Leakage Protection Technology"
was bestowed second prize of 2010 Dayu Water Resources
Science and Technology Awards by MWR.
The project is conducted with the
aim of solving the problem of a low level of electric
leakage protection technology. In regard of soft technology,
the knowledge of the variation rules of leakage currents
remained at perceptual stage, lacking scientific basis;
the rated operating currents of leakage protection and
the set value of operating time are roughly categorized
with wide dead zones. In regard of hardware technology,
problems derived from the application of analog electronic
circuit which bore few functions and big error values.
The main research achievements include: setting up mathematic
model for electric leakage protection which is suitable
for China's rural grid, on the basis of scientific analyzes
of the distribution rule of electric leakage currents
in rural grid; putting forward more scientific and reasonable
set values of rated operating currents and operating time
of electric leakage protection which have greatly enhanced
the sensitivity and security; developing specialized integrated
circuit chip for digital leakage protector which has significantly
improved the performance of the leakage protector; revising
Specifications for Installation and Operation of Protector
against Electric Leakage in Rural Areas(SD219¡ª87) based
on the latest research achievements. The promulgation
and implementation of the new specification plays a magnificent
role in guiding the installation and operation of the
protector against electric leakage in rural network.(2010-11-03)
