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Namangan Institute of Engineering and Technology
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Bog'liq ТўпламNamangan Institute of Engineering and Technology
nammti.uz
10.25.2023
Pg.35
to the fact that the produced electricity is transmitted over long distances through overhead
transmission lines, there are cases of failures due to external influences on overhead transmission
lines compared to the rest of the devices. This leads to line shutdowns and reduced reliability.
Conditions that negatively affect the operation of air lines include, first of all, atmospheric
phenomena and natural disasters, the influence of flora and fauna, unusual factors associated with
human activity, as well as the interaction of air and technical failures can be cited as an example. In
110, 220, 500 kV networks, emergency shutdowns are caused by natural disasters and human
factors.
Determining the location of damage OMP technical tools are widely used for use in overhead
lines of all voltage classes. Depending on the voltage class, OMP devices are divided into two types:
OMP devices in networks with large short-circuit currents to the ground
OMP devices in networks with small short-circuit currents to the ground
Semiconductor and microprocessor inverters are used to measure and store current and
voltage. Compared to semiconductor devices, microprocessor-based recording devices allow for
more complex OMP algorithms, easier reprogramming and more accurate calculations when
changing network parameters. The performance of microprocessor-based OMP devices does not
exceed 5% error in determining the distance to the damaged location. In the event of a fault in the
monitored line, OMP devices perform the functions of measuring and storing the currents and
voltages of the short-circuit mode. Processing of measurement results is carried out after the line is
switched off by relay protection
1 - picture. Determining the location of damage in overhead power lines
If there is a fault at any point in the line connecting substations 1 and 2 in this figure, for
example, a single-phase short circuit occurs. Indicators installed at the ends of the line record the
emergency current and voltage. we get the distance of the damage site:
L
x
=
I 2Z+U2 − U1
Z0 ( I1 + I2 )
(km)
(1)
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