Note: Descriptions are shown in the official language in which they were submitted.
CA 03034698 2019-01-22
PORTABLE EMERGENCY POWER SUPPLY
TECHNICAL FIELD
[0001] The present disclosure belongs to the technical field of electric
engineering, and
for example, relates to a portable emergency power supply.
BACKGROUND
[0002] The widespread rain and snow freezing hazard in South of China led to a
great
loss in 2008. Due to wide distribution, most of power distribution network
lines are
located in a micro-topographic and micro-weather region, and tower falling and
line
breaking accidents occur frequently. To research and develop a simple and
efficient
deicing and power generating apparatus for a power distribution network is
critical for
improving the intensity of the distribution networks and ensuring the
reliability in power
supply. At present, some research and development institutions already develop
a
portable deicing apparatus for a power distribution network based on medium-
frequency
voltage regulation and rectification, and the apparatus achieves a certain
effect in the rain
and snow freezing hazard. However, since the apparatus only has a DC deicing
function,
the apparatus is only used in several days with consecutive low temperature
weather and
is even in an idle state in several successive years. The deicing apparatus
often cannot be
used at the idle state due to a series of problems such as the aging of a
generator storage
battery, incapability of being started due to power shortage, damage of
rectifying
modules and the like. Meanwhile, a low utilization rate of the deicing
apparatus severely
influences popularization and application of the portable deicing apparatus,
and the
coverage is small. Moreover, the portable deicing apparatus is not high in
deicing
efficiency and can only melt one to two stages of a pole at one time. When a
severe
freezing hazard occurs, pole falling and line breaking of the distribution
network line
cannot be effectively prevented.
CA 03034698 2019-01-22
SUMMARY
[0003] The present disclosure provides a portable emergency power supply. The
apparatus can be used as an emergency power supply to guarantee the power
supply at
ordinary times and can be used for deicing the power distribution lines when a
power
distribution network has the rain and snow freezing hazard, so that the
utilization rate
and coverage of the apparatus are increased, and the safe operation of the
power
distribution network lines can be powerfully supported.
[0004] A portable emergency power supply includes a medium-frequency
generator, an
uncontrolled 12-pulse-wave rectification component, a series-parallel
switching knife
switch, an emergency power supply switch, a DC deicing switch, an inversion
component, a DC deicing wire connection apparatus and a deicing three-phase
short-circuiting wire, where
[0005] an output end of the medium-frequency generator is connected with the
uncontrolled 12-pulse-wave rectification component, the uncontrolled 12-pulse-
wave
rectification component is connected with the series-parallel switching knife
switch, and
the series-parallel switching knife switch is connected with the inversion
component
through the emergency power supply switch so as to realize a power supply
function;
[0006] the uncontrolled 12-pulse-wave rectification component is configured to
rectify
an output current of the medium-frequency generator, where the rectified
output current
is referred to as rectified current;
[0007] the series-parallel switching knife switch is configured to regulate an
output
voltage of the medium-frequency generator and the rectified current so as to
meet a
deicing demand of different lines and different power demands during power
supply;
[0008] the inversion component is configured to invert the output voltage so
as to
obtain a power frequency voltage;
[0009] the emergency power supply switch is configured to control
disconnection and
connection between the series-parallel switching knife switch and the
inversion
component;
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[0010] the series-parallel switching knife switch is further connected with
the DC
deicing wire connection apparatus through the DC deicing switch; the DC
deicing wire
connection apparatus is configured to be connected with a first end of a to-be-
deiced
conducting wire; and a second end of the to-be-deiced conducting wire is
subjected to
three-phase short-circuiting connection through the deicing three-phase short-
circuiting
wire so as to realize a DC deicing function;
[0011] the DC deicing switch is configured to control connection and
disconnection
between the series-parallel switching knife switch and the DC deicing wire
connection
apparatus and is mutually interlocked with the emergency power supply switch;
and
[0012] the DC deicing wire connection apparatus is configured to realize DC
deicing of
the distribution network lines.
[0013] Optionally, the series-parallel switching knife switch includes a first
parallel
knife switch, a second parallel knife switch and a series knife switch; where
the first
parallel knife switch is connected with the second parallel knife switch in
parallel, a first
end of the series knife switch is connected with a first end of the first
parallel knife
switch, and a second end of the series knife switch is connected with a first
end of the
second parallel knife switch.
[0014] Optionally, the DC deicing wire connection apparatus includes a first
positive
terminal, a second positive terminal and a negative terminal;
[0015] the to-be-deiced conducting wire includes a first to-be-deiced
conducting wire
and a second to-be-deiced conducting wire;
[0016] a first end of the first positive terminal is connected with a first
end of the
second positive terminal and is configured to access a positive electrode of
the DC
deicing switch, and a first end of the negative terminal is configured to
access a negative
electrode of the deicing switch; and
[0017] a second end of the first positive terminal is suspended; a second end
of the
second positive terminal is connected with the first to-be-deiced conducting
wire; and a
second end of the negative terminal is connected with the second to-be-deiced
conducting wire; or the second end of the first positive terminal is connected
with the
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first to-be-deiced conducting wire; the second end of the second positive
terminal is
suspended; and the second end of the negative terminal is connected with the
second
to-be-deiced conducting wire.
[0018] Optionally, the DC deicing wire connection apparatus includes a first
positive
terminal, a second positive terminal and a negative terminal;
[0019] the to-be-deiced conducting wire includes a first to-be-deiced
conducting wire, a
second to-be-deiced conducting wire and a third to-be-deiced conducting wire;
[0020] a first end of the first positive terminal is connected with a first
end of the
second positive terminal and is configured to access a positive electrode of
the DC
deicing switch, and a first end of the negative terminal is configured to
access a negative
electrode of the deicing switch; and
[0021] a second end of the second positive terminal is connected with the
first
to-be-deiced conducting wire, a second end of the negative terminal is
connected with
the second to-be-deiced conducting wire, and the second end of the first
positive terminal
is connected with the third to-be-deiced conducting wire.
[0022] Optionally, the DC deicing wire connection apparatus further includes a
deicing
cable and a deicing wire clamp; where
[0023] at least one of the first positive terminal, the second positive
terminal and the
negative terminal is connected with the deicing wire clamp through the deicing
cable,
and the deicing wire clamp is configured to be connected with the first end of
the
to-be-deiced conducting wire.
[0024] Optionally, the deicing short-circuiting wire includes a short-
circuiting wire
clamp and a short-circuiting cable, and is arranged at the second end of the
to-be-deiced
conducting wire and is configured to enable the to-be-deiced conducting wire
in a
distribution network line to realize three-phase short-circuiting grounding so
as to
perform DC deicing.
[0025] The portable emergency power supply provided by the present disclosure
simultaneously has a DC deicing function and an emergency power supply
function,
thereby greatly extending an application range, and is used as the emergency
power
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supply at ordinary times and used for the DC deicing of the power distribution
network
lines at an ice covering period; the portable emergency power supply is wide
in the
application range, has a potential of being widely popularized, and can
greatly improve
the capacity of the rural power distribution network lines for resisting the
extensive rain
and snow freezing hazard after being widely used; the portable emergency power
supply
has a multi-circuit regulation function, is wide in power supply and deicing
range, and
has a control system which is simple and convenient; and the deicing voltage
is good in
DC performance. By adopting a power supply mode that the power is generated in
a
medium-frequency manner and then rectified and inverted, the dimension and
weight of
the generator are greatly reduced, the generator can be carried manually by
two persons,
and the emergency power supply and deicing maneuverability are strong; the
wire
connection wire clamp is adopted to perform the deicing connection and three-
phase
short-circuiting connection, so that the wire connection is convenient, and
the deicing
efficiency is high; and meanwhile, the end is grounded in a three-phase short-
circuiting
manner, so that dangers such as reverse power transmission and the like when
the
distribution network line is deiced can be effectively prevented.
BRIEF DESCRIPTION OF DRAWINGS
[0026] Fig. 1 is a schematic structural diagram illustrating a portable
emergency power
supply in the present embodiment;
[0027] Fig. 2 is a schematic structural diagram illustrating a series-parallel
switching
knife switch in the present embodiment; switchover
[0028] Fig. 3 is a schematic structural diagram illustrating a DC deicing wire
connection apparatus 7 in the present embodiment; and
[0029] Fig. 4 is a schematic structural diagram illustrating a deicing three-
phase
short-circuiting wire 9 in the present embodiment.
[0030] List of reference numerals:
1: medium-frequency generator;
2: uncontrolled 12-pulse-wave rectification component;
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3: series-parallel switching knife switch;
4: emergency power supply switch;
5: DC deicing switch;
6: inversion component;
7: DC deicing wire connection apparatus;
8: to-be-deiced conducting wire;
9: deicing three-phase short-circuiting wire;
31: series knife switch;
32: first parallel knife switch;
33: second parallel knife switch;
71: negative terminal;
72: first positive terminal;
73: second positive terminal;
74: deicing cable;
75: deicing wire clamp;
91: short-circuiting wire clamp;
92: short-circuiting cable.
DETAILED DESCRIPTION
[0031] The portable emergency power supply is wide in application. If the
portable
power supply has a deicing capacity, then a configuration rate of a deicing
component is
greatly increased, and safety and power supply reliability of a power
distribution network
in rain and snow freezing hazards can be effectively supported while an
emergency
power supply guaranteeing function is realized.
[0032] Fig. 1 is a schematic structural diagram illustrating a portable
emergency power
supply in the present embodiment. Fig. 2 is a schematic structural diagram
illustrating a
series-parallel switching knife switch in the present embodiment. Fig. 3 is a
schematic
structural diagram illustrating a DC deicing wire connection apparatus 7 in
the present
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embodiment. Fig. 4 is a schematic structural diagram illustrating a deicing
three-phase
short-circuiting wire 9 in the present embodiment.
[0033] As shown in Fig. 1, a portable emergency power supply having a DC
deicing
function includes a medium-frequency generator 1, an uncontrolled 12-pulse-
wave
rectification component 2, a series-parallel switching knife switch 3, an
emergency
power supply switch 4, a DC deicing switch 5, an inversion component 6, a DC
deicing
wire connection apparatus 7 and a deicing three-phase short-circuiting wire 9.
[0034] An output end of the medium-frequency generator 1 is connected with the
uncontrolled 12-pulse-wave rectification component 2; the uncontrolled 12-
pulse-wave
rectification component 2 is connected with the series-parallel switching
knife switch 3;
and the series-parallel switching knife switch 3 is connected with the
inversion
component 6 through the emergency power supply switch 4 so as to realize a
power
supply function.
[0035] The uncontrolled 12-pulse-wave rectification component 2 is configured
to
rectify an output current of the medium-frequency generator 1, and the
rectified output
current is referred to as rectified current.
[0036] The series-parallel switching knife switch 3 is configured to regulate
an output
voltage of the medium-frequency generator 1 and the rectified current so as to
meet a
deicing demand of different lines and different power demands during power
supply.
[0037] The inversion component 6 is configured to invert the output voltage
corresponding to the rectified current to obtain a power frequency voltage.
[0038] The emergency power supply switch 4 is configured to control
disconnection
and connection between the series-parallel switching knife switch 3 and the
inversion
component 6.
[0039] The series-parallel switching knife switch 3 is further connected with
the DC
deicing wire connection apparatus 7 through the DC deicing switch 5; the DC
deicing
wire connection apparatus 7 is configured to be connected with a first end of
a
to-be-deiced conducting wire 8; and a second end of the to-be-deiced
conducting wire 8
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is subjected to three-phase short-circuiting connection through the deicing
three-phase
short-circuiting wire 9 so as to realize a DC deicing function.
[0040] The DC deicing switch 5 is configured to control connection and
disconnection
between the series-parallel switching knife switch 3 and the DC deicing wire
connection
apparatus 7 and is mutually interlocked with the emergency power supply switch
4.
[0041] The DC deicing wire connection apparatus 7 is configured to realize DC
deicing
of the to-be-deiced conducting wire.
[0042] The medium-frequency generator 1 in the present embodiment may adopt a
commercially available TFDJ-12 light-weight generator with a dimension of 0.7
m X 0.7
m X 0.6 m, a weight of 80 kg, a generation power of 12 kW, a generation
frequency of
400 Hz and an output voltage range of 12V to 24V and with a voltage-current
display
function. The uncontrolled 12-pulse-wave rectification component 2 may adopt
an
XDJS-20 12-pulse-wave rectifier with a rated current of 500A and a rated
voltage of 30V.
The series-parallel switching knife switch 3 may adopt a CK-20 small-sized
switching
knife switch. The emergency power supply switch 4 and the deicing power supply
switch
are connected by adopting a cable. The inversion component 6 may adopt a
commercially available FLUKENB-9 inverter with the inversion power of 9kW,
having a
voltage display function and basically capable of meeting power supply demands
of
small-sized emergency fields. A connector in the DC deicing wire connection
apparatus 7
may adopt a self-made connector and has a shunt for measuring the deicing
current. The
current through capacity is 500A. The deicing cable may adopt a JV-120 cable.
A length
of each cable is 30m, and a length of each wire connection wire clamp is 3m.
Each phase
is formed by connecting two cables, and the deicing wire connection demand of
all
distribution network lines can be met. The deicing three-phase short-
circuiting wire may
be configured same with the deicing wire clamp and is grounded by virtue of a
short-circuiting cable with a grounding nail, wherein the medium-frequency
generator is
a special synchronous generator for generating three-phase medium-frequency
electric
power. Generally the frequency range of the medium-frequency generator is
greater than
the power frequency and less than 10000Hz.
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[0043] During emergency power supply, the emergency power supply switch 4 and
the
deicing power supply switch 5 are disconnected, the emergency power supply
switch 4
and the deicing power supply switch 5 may be disconnected by the operation
personnel,
the DC output is enabled to reach the rated voltage of the inversion component
6 by
regulating the voltage of the medium-frequency generator 1 and the series-
parallel
switching knife switch 3, the medium-frequency generator is switched off, the
emergency power supply switch 4 is switched on, the deicing power supply
switch 5 is
still in a disconnected state, and the emergency power supply function can be
realized by
starting the medium-frequency generator 1.
[0044] During DC deicing, the deicing wire connection is performed according
to a
deicing scheme, that is, the DC deicing wire connection apparatus 7 is
connected to a
circuit shown in Fig. 1. The three-phase short-circuiting grounding is
performed, that is,
the first end of the deicing three-phase short-circuiting wire 9 is connected
to the circuit
shown in Fig. 1; the second end is grounded; the position of the series-
parallel knife
switch 3 is regulated; the voltage of the medium-frequency generator 1 is
regulated to a
minimum position; the deicing power supply switch 5 is switched on; the
emergency
power supply switch 4 is disconnected; the medium-frequency generator 1 is
started; the
voltage is regulated to the corresponding deicing current; the DC deicing is
implemented;
and after the DC deicing is completed, the phase-changing deicing is performed
by the
DC deicing wire connection apparatus 7 until the three-phase deicing is
completely
ended. During deicing, the minimum output voltage is obtained when the series-
parallel
switching knife switch 3 is in parallel connection, that is, when the series
knife switch 31
is disconnected and the first parallel knife switch 32 and the second parallel
knife switch
33 are switched on; and the maximum output voltage is obtained when the series-
parallel
switching knife switch 3 is in series connection, that is, when the series
knife switch 31
is switched on, and the first parallel knife switch 32 and the second parallel
knife switch
33 are disconnected. The output voltage is calculated as follows:
LIDc = 1.25kUAc
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[0045] Upcis the output voltage during DC deicing; brAc is the output voltage
of the
medium-frequency generator 1, the output voltage range of the medium-frequency
generator 1 may be 12V to 24V, k in the formula is a coefficient during series
connection, the output voltage range obtained by calculation is 15V to 60V
during DC
deicing, and a DC deicing range can be calculated according to multiple linear
parameters of the rural distribution network lines.
n
[0046] Minimum deicing distance 1m =' =
ZiniaxRe
Umax
[0047] Maximum deicing distance i,, ¨
x
[0048] Uõ,iõ is the minimum output DC voltage (15V), LT,, is the maximum
output
DC voltage (60V), 4õiõ and 4,a, are respectively minimum deicing current and
maximum deicing current corresponding a specific linear conducting wire, R0 is
the
resistance per unit length of the linear conducting wire, and the resistance
coefficients
during two-phase series connection and in two-parallel and one-series
connection are
respectively 2 and 1.5. The deicing distance range of the apparatus can be
calculated as
shown in Table 1 according to the formula and the conducting wire parameters.
Referring
to Fig. 3, the to-be-deiced conducting wire 8 is a three-phase conducting wire
which is
successively an upper phase conducting wire, a middle phase conducting wire
and a
lower phase conducting wire from top to bottom. The series connection in two
phases
may refer to that the second positive terminal 73 in Fig. 3 is connected with
the upper
phase conducting wire, the negative terminal 71 is connected with the lower
phase
conducting wire, the upper and lower phase conducting wires are connected in
series,
and the first positive terminal 72 is suspended, that is, the middle phase
conducting wire
is not deiced temporarily. Optionally, the series connection in two phases may
also refer
to that the first positive terminal 72 in Fig. 3 is connected with the middle
phase
conducting wire, the negative terminal 71 is connected with the lower phase
conducting
wire, the upper and lower phase conducting wires are connected in series, and
the second
positive terminal 73 is suspended, that is, the upper phase conducting wire is
not deiced
temporarily. The two-parallel and one-series connection refers to that the
negative
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terminal 71 is connected with the lower phase conducting wire in Fig. 3, the
first positive
terminal 72 is connected with the middle phase conducting wire, the second
positive
terminal 73 is connected with the upper phase conducting wire, and the
negative terminal
71 and the first positive terminal 72 are connected together so as to realize
the parallel
connection between the upper phase conducting wire and the middle phase
conducting
wire; then the upper phase conducting wire and the middle phase conducting
wire are
connected with the lower phase conducting wire in series, and only the lower
phase
conducting wire is deiced.
Table 1
Type of conducting wire Maximum deicing distance (m) Minimum deicing
distance (n)
Lalx35 273 34
LGJx50 .311 38
LGJx70 347 45
LG Jx95 384 50
Laix120 406 49
LGJx150 430 48
[0049] The above deicing solution may refer to a solution formulated for a
specific
deicing line before the deicing and includes such contents as wire connection,
a deicing
voltage value, predicted deicing time and the like.
[0050] A working principle of the portable emergency power supply of the
present
embodiment is as follows: the medium-frequency generator 1 is used as a
deicing and
emergency power supply; the apparatus adopts the middle-frequency power
generation
manner, so that the dimension and weight of the generator are greatly reduced
in the case
of ensuring constant power and voltage, and a high-quality DC voltage can be
output by
virtue of processing of the uncontrolled 12-pulse-wave rectification component
2. Two
output circuits of the uncontrolled 12-pulse-wave rectification component 2
are
converged through the series-parallel switching knife switch 3; when the
series knife
switch 31 is switched on, the two output circuits of the uncontrolled 12-pulse-
wave
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rectification component 2 are connected in series, and a maximum voltage can
be
obtained; and when the first parallel knife switch 32 and the second parallel
knife switch
33 are switched on, the two output circuits of the uncontrolled 12-pulse-wave
rectification component 2 are connected in parallel, and a maximum current can
be
obtained. The output of the series-parallel switching knife switch 3 is
connected to the
inversion component 6 through the emergency power supply switch 4; the DC
voltage is
inverted; the DC voltage of 220V or 50Hz can be output by regulating the
output voltage
of the medium-frequency generator 1; and the output DC voltage can be used for
the
emergency power supply in the case of power failure or field construction. The
output of
the series-parallel switching knife switch 3 is connected to the DC deicing
wire
= connection apparatus 7 through the DC deicing switch 5; the first
positive terminal 72 in
the DC deicing wire connection apparatus 7 is connected with the second
positive
terminal 73; the first positive terminal 72 and the second positive terminal
73 are
simultaneously connected to a positive electrode of the DC deicing switch 5;
the negative
terminal 71 is connected to a negative electrode of the deicing switch 5; each
of the first
positive terminal 72, the second positive terminal 73 and the negative
terminal 71 is
connected with the deicing wire clamp 75 through a deicing cable 74; the
corresponding
wire clamp is connected to the to-be-deiced conducting wire 8 before the
deicing; and
the three-phase short-circuiting grounding is realized at the tail end of the
to-be-deiced
conducting wire through the short-circuiting wire clamp 91 and the short-
circuiting cable
92 so as to perform DC deicing.
[0051] The series-parallel switching knife switch 3 in the present embodiment
can
realize the selection of high voltage and high current (that is, the maximum
voltage can
reach 60V during series connection, and the maximum current can reach 400A
during
parallel connection, which are sufficient for deicing the conducting wire of
the power
distribution network); the deicing demands of different lines and different
power
demands during power supply can be met; the first parallel knife switch 32 and
the
second parallel knife switch 33 are interlocked (that is, the first parallel
knife switch 32
and the second parallel knife switch 33 are simultaneously disconnected or
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simultaneously connected), and are simultaneously interlocked with the series
knife
switch 31 (that is, the series knife switch 31 must be in a disconnected state
when the
first parallel knife switch 32 and the second parallel knife switch 33 are
switched on) so
as to prevent the short circuit; by virtue of the emergency power supply
switch 4 and the
DC deicing switch 5, the DC deicing and the emergency power supply can be
directly
switched, and the two switches are interlocked; simultaneous deicing of the
conducting
wires of two phases and the deicing of the conducting wire of one phase can be
realized
through the DC deicing wire connection apparatus 7; the second positive
terminal 73 and
the negative terminal 71 are connected with the conducting wires of the two
phases so as
to realize the two-phase series deicing; the conducting wires of the two
phases are
simultaneously deiced; and the second positive terminal 73, the first positive
terminal 72
and the negative terminal 71 are simultaneously connected with the conducting
wires of
three phases so as to realize the two-parallel and one-series deicing, and
only the
conducting wires in series are deiced.
[0052] Optionally, the present embodiment adopts the medium-frequency power
generation technology as a power supply to be firstly rectified, and then the
rectified DC
voltage is inverted to obtain the power-frequency voltage, so that the
dimension and
weight of the emergency power supply are reduced in the case of ensuring the
constant
power. Meanwhile, the DC voltage can be directly used for deicing, and the
application
maneuverability of the apparatus is strong.
[0053] Optionally, the present embodiment adopts the cable and the wire
connection
wire clamp to connect the to-be-deiced conducting wire and to realize the
three-phase
short-circuiting connection, so that the wire connection is convenient, and
the deicing
efficiency is high; and meanwhile, the short-circuiting grounding way is
adopted at the
tail end, so that the danger of reverse power transmission when the rural
distribution
network lines are deiced can be effectively avoided.
[0054] Optionally, the present embodiment adopts the uncontrolled 12-pulse-
wave
rectification component as the rectifier of the medium-frequency generator in
the present
embodiment, so that the control system of the apparatus is simple and
convenient, the
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heat dissipation is convenient, the rectifying effect is good, and the
application of a
low-voltage system is facilitated.
INDUSTRIAL APPLICABILITY
[0055] The portable emergency power supply provided by the present embodiment
simultaneously has a DC deicing function and an emergency power supply
function,
thereby greatly extending the application range, and is used as the emergency
power
supply at ordinary times and used for the DC deicing of the power distribution
network
lines at an ice covering period; the portable emergency power supply is wide
in
application range, and can greatly improve the capacity of the rural
distribution network
lines for resisting the widespread rain and snow freezing hazard after being
widely used;
and the portable emergency power supply has a multi-circuit regulation
function, is wide
in the power supply and deicing range, and has the control system which is
simple and
convenient; and the deicing voltage is good in DC performance. By adopting a
power
supply mode that the power is generated in a medium-frequency manner and then
rectified and inverted, the dimension and weight of the generator are greatly
reduced, and
the emergency power supply and deicing maneuverability are strong. The wire
connection wire clamp is adopted to perform the deicing connection and three-
phase
short-circuiting connection, so that the wire connection is convenient, and
the deicing
efficiency is high; and meanwhile, the three-phase short-circuiting grounding
is adopted
at the tail end, so that the danger of reverse power transmission when the
distribution
network lines are deiced can be effectively prevented.
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