IEEE Electrification - September 2021 - 125

Figure 6. A mobile dc de-icing vehicle.
efficiency can be improved by using the dc de-icing method.
A portable dc thermal de-icing device with its small
size and flexibility, which could also be mounted on
mobile systems, is more suitable for hard-to-access
regions in power distribution network.
Mobile De-Icing Vehicle
Since power distribution lines are shorter in length, a
mobile device is used to perform the de-icing function.
A mobile de-icing vehicle (MDIV) is a truck-mounted
converter, shown in Figure 6, which is employed
around the world and can be routed to de-ice several
lines before and during ice storms. The dc de-icing
process of MDIV is carried out by converting the ac
power to dc current to perform the de-icing process
when the distribution voltage is relatively low, and the
ice-melting distance is relatively short. Therefore, the
heat-based dc de-icing device rectifies the power generated
by the mobile power supply for de-icing of the
power distribution network. Then the rectified dc voltage
is applied to the three-phase circuit by grounding
the three phases at the end of the line. The ice-melting
current can be adjusted using the voltage of the vehicle-mounted
power supply. MDIV can often melt the
ice on 3-mi-long lines and is ideal for partial and complete
de-icing of distribution network lines. Because
the branch line is separated from the main line by a
switch, the main line can keep the power supply and
reduce the blackout range when melting the ice.
Portable De-Icing Device
A portable dc de-icing device (PDID), shown in Figure 7,
is a small, lightweight de-icing device that can be easily
moved around and used in areas of distribution system
that are not easily accessible by MDIV. A PDID's rectifier
transforms the ac voltage generated by the portable
generator into a dc current to melt the accumulated ice
on the line. The only drawback of this compact PDID is
its short ice-melting distance. Statistically, there is a
higher chance of a pole collapse or a line breakage during
an ice storm in the power distribution network. The
economic loss caused by power outages resulting from
a pole collapse or a line breakage during an ice storm
and the emergency repair and recovery are considerable.
However, the investment cost of a distribution network
de-icing system to mitigate possible disruptions
Figure 7. A portable dc de-icing device.
IEEE Electrification Magazine / SEPTEMBER 2021 125

IEEE Electrification - September 2021

Table of Contents for the Digital Edition of IEEE Electrification - September 2021

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IEEE Electrification - September 2021 - Cover3
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