CA3034698A1 - Portable emergency power supply - Google Patents
Portable emergency power supply Download PDFInfo
- Publication number
- CA3034698A1 CA3034698A1 CA3034698A CA3034698A CA3034698A1 CA 3034698 A1 CA3034698 A1 CA 3034698A1 CA 3034698 A CA3034698 A CA 3034698A CA 3034698 A CA3034698 A CA 3034698A CA 3034698 A1 CA3034698 A1 CA 3034698A1
- Authority
- CA
- Canada
- Prior art keywords
- deicing
- power supply
- deiced
- switch
- conducting wire
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000010586 diagram Methods 0.000 description 8
- 230000008014 freezing Effects 0.000 description 7
- 238000007710 freezing Methods 0.000 description 7
- 230000001105 regulatory effect Effects 0.000 description 5
- 230000033228 biological regulation Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G7/00—Overhead installations of electric lines or cables
- H02G7/16—Devices for removing snow or ice from lines or cables
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/08—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems requiring starting of a prime-mover
Landscapes
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Direct Current Feeding And Distribution (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
ABSTRACT
A portable emergency power supply for meeting deicing demands of different lines and different power demands during power supply. In the emergency power supply, an output end of a medium-frequency generator is connected with a uncontrolled 12-pulse-wave rectification component; the uncontrolled 12-pulse-wave rectification component is connected with a series-parallel switching knife switch; and the series-parallel switching knife switch is connected with an inversion component through an emergency power supply switch so as to realize a power supply function; the uncontrolled 12-pulse-wave rectification component is configured to rectify an output current of a medium-frequency generator, where the rectified output current is referred to as rectified current; and the series-parallel switching knife switch is configured to regulate the output voltage of the medium-frequency generator and the rectified current.
The portable emergency power supply is useful in extending application range.
A portable emergency power supply for meeting deicing demands of different lines and different power demands during power supply. In the emergency power supply, an output end of a medium-frequency generator is connected with a uncontrolled 12-pulse-wave rectification component; the uncontrolled 12-pulse-wave rectification component is connected with a series-parallel switching knife switch; and the series-parallel switching knife switch is connected with an inversion component through an emergency power supply switch so as to realize a power supply function; the uncontrolled 12-pulse-wave rectification component is configured to rectify an output current of a medium-frequency generator, where the rectified output current is referred to as rectified current; and the series-parallel switching knife switch is configured to regulate the output voltage of the medium-frequency generator and the rectified current.
The portable emergency power supply is useful in extending application range.
Description
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
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.
SUMMARY
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;
[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;
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
and
[0012] the DC deicing wire connection apparatus is configured to realize DC
deicing of the distribution network lines.
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
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 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
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 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
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;
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;
1: medium-frequency generator;
2: uncontrolled 12-pulse-wave rectification component;
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 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.
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 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.
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 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.
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 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.
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.
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.
[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
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
[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
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
ZiniaxRe Umax
[0047] Maximum deicing distance i,, ¨
x
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 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
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 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 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.
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 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.
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 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.
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 heat dissipation is convenient, the rectifying effect is good, and the application of a low-voltage system is facilitated.
INDUSTRIAL APPLICABILITY
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.
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.
Claims (6)
1. A portable emergency power supply, comprising a medium-frequency generator, an uncontrolled 12-pulse-wave rectification component, a series-parallel switching knife switch, an emergency power supply switch, a Direct Current (DC) deicing switch, an inversion component, a DC deicing wire connection apparatus and a deicing three-phase short-circuiting wire; wherein 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;
the uncontrolled 12-pulse-wave rectification component is configured to rectify an output current of the medium-frequency generator, wherein the rectified output current is referred to as rectified current;
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 deicing demands of different lines and different power demands during power supply;
the inversion component is configured to invert the output voltage so as to obtain a power-frequency voltage;
the emergency power supply switch is configured to control disconnection and connection between the series-parallel switching knife switch and the inversion component;
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;
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 the DC deicing wire connection apparatus is configured to realize DC deicing of the to-be-deiced conducting wire.
the uncontrolled 12-pulse-wave rectification component is configured to rectify an output current of the medium-frequency generator, wherein the rectified output current is referred to as rectified current;
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 deicing demands of different lines and different power demands during power supply;
the inversion component is configured to invert the output voltage so as to obtain a power-frequency voltage;
the emergency power supply switch is configured to control disconnection and connection between the series-parallel switching knife switch and the inversion component;
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;
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 the DC deicing wire connection apparatus is configured to realize DC deicing of the to-be-deiced conducting wire.
2. The portable emergency power supply according to claim 1, wherein the series-parallel switching knife switch comprises a first parallel knife switch, a second parallel knife switch and a series knife switch; wherein 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.
3. The portable emergency power supply according to claim 1 or 2, wherein the DC
deicing wire connection apparatus comprises a first positive terminal, a second positive terminal and a negative terminal;
the to-be-deiced conducting wire comprises a first to-be-deiced conducting wire and a second to-be-deiced conducting wire;
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 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 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.
deicing wire connection apparatus comprises a first positive terminal, a second positive terminal and a negative terminal;
the to-be-deiced conducting wire comprises a first to-be-deiced conducting wire and a second to-be-deiced conducting wire;
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 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 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.
4. The portable emergency power supply according to claim 1 or 2, wherein the DC
deicing wire connection apparatus comprises a first positive terminal, a second positive terminal and a negative terminal;
the to-be-deiced conducting wire comprises a first to-be-deiced conducting wire, a second to-be-deiced conducting wire and a third to-be-deiced conducting wire;
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 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.
deicing wire connection apparatus comprises a first positive terminal, a second positive terminal and a negative terminal;
the to-be-deiced conducting wire comprises a first to-be-deiced conducting wire, a second to-be-deiced conducting wire and a third to-be-deiced conducting wire;
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 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.
5. The portable emergency power supply according to claim 3 or 4, wherein the DC
deicing wire connection apparatus further comprises a deicing cable and a deicing wire clamp; wherein 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.
deicing wire connection apparatus further comprises a deicing cable and a deicing wire clamp; wherein 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.
6. The portable emergency power supply according to claim 5, wherein the deicing short-circuiting wire comprises 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.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620785937.9 | 2016-07-25 | ||
| CN201620785937.9U CN205882846U (en) | 2016-07-25 | 2016-07-25 | Have portable emergency power source of direct current ice -melt function concurrently |
| PCT/CN2017/094379 WO2018019240A1 (en) | 2016-07-25 | 2017-07-25 | Portable emergency power |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA3034698A1 true CA3034698A1 (en) | 2018-02-01 |
| CA3034698C CA3034698C (en) | 2021-05-18 |
Family
ID=57697169
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA3034698A Active CA3034698C (en) | 2016-07-25 | 2017-07-25 | Portable emergency power supply |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN205882846U (en) |
| CA (1) | CA3034698C (en) |
| WO (1) | WO2018019240A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113161965A (en) * | 2021-03-09 | 2021-07-23 | 湖南防灾科技有限公司 | Efficient direct-current ice melting device special for wind power circuit and parameter adaptation method thereof |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107658971B (en) * | 2016-07-25 | 2024-04-16 | 国网湖南省电力公司 | Portable emergency power supply with direct-current ice melting function |
| CN205882846U (en) * | 2016-07-25 | 2017-01-11 | 国网湖南省电力公司 | Have portable emergency power source of direct current ice -melt function concurrently |
| CN107482530A (en) * | 2017-09-20 | 2017-12-15 | 湖南省湘电试研技术有限公司 | Based on the Portable rural distribution exchange de-icing method and device for handing over orthogonal Two Stages |
| CN109066469A (en) * | 2018-09-17 | 2018-12-21 | 广东电网有限责任公司 | A kind of generator car Quick access device for distribution network overhead line |
| CN113451972A (en) * | 2021-07-29 | 2021-09-28 | 清远电力规划设计院有限公司 | Line alternating-current ice melting device and system |
| CN113917297A (en) * | 2021-10-11 | 2022-01-11 | 广东电网有限责任公司广州供电局 | Cable detection device and cable detection system |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1229876A1 (en) * | 1983-11-16 | 1986-05-07 | Южное Отделение Ордена Октябрьской Революции Всесоюзного Государственного Проектно-Изыскательского И Научно-Исследовательского Института Энергетических Систем И Электрических Сетей "Энергосетьпроект" | Device for melting glazed frost on wires of electric power lines |
| RU2422963C2 (en) * | 2009-05-08 | 2011-06-27 | Открытое акционерное общество "Научно-исследовательский институт по передаче электроэнергии постоянным током высокого напряжения" (ОАО "НИИПТ") | Device to melt silver thaw on wires and cables of overhead line (versions) |
| CN201590771U (en) * | 2009-06-18 | 2010-09-22 | 江西省电力科学研究院 | Multipurpose large-power controllable power source |
| CN102684128A (en) * | 2012-06-01 | 2012-09-19 | 湖南省电力公司科学研究院 | Portable ultra-short agricultural distribution network DC ice melting device |
| CN103950394B (en) * | 2014-03-25 | 2015-03-25 | 株洲变流技术国家工程研究中心有限公司 | Alternating current and direct current mixed traction power supply system with ice melting function |
| CN205882846U (en) * | 2016-07-25 | 2017-01-11 | 国网湖南省电力公司 | Have portable emergency power source of direct current ice -melt function concurrently |
-
2016
- 2016-07-25 CN CN201620785937.9U patent/CN205882846U/en active Active
-
2017
- 2017-07-25 CA CA3034698A patent/CA3034698C/en active Active
- 2017-07-25 WO PCT/CN2017/094379 patent/WO2018019240A1/en active Application Filing
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113161965A (en) * | 2021-03-09 | 2021-07-23 | 湖南防灾科技有限公司 | Efficient direct-current ice melting device special for wind power circuit and parameter adaptation method thereof |
| CN113161965B (en) * | 2021-03-09 | 2022-07-19 | 湖南防灾科技有限公司 | Efficient direct-current ice melting device special for wind power circuit and parameter adaptation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CA3034698C (en) | 2021-05-18 |
| WO2018019240A1 (en) | 2018-02-01 |
| CN205882846U (en) | 2017-01-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA3034698C (en) | Portable emergency power supply | |
| CN103915808B (en) | DC ice melting device based on voltage source type current converter and control method thereof | |
| CN109217458B (en) | Hybrid main power supply system of electric ship and control method | |
| CN100511899C (en) | AC line-feeding deicing connection plan for current-exchanging station | |
| WO2021136286A1 (en) | System and method for melting ice on overhead line by using photovoltaic power generation | |
| CN102623941A (en) | Direct current deicing device for 10KV rural power grid distribution line | |
| CN211183434U (en) | Double-end direct current power distribution system | |
| CN215835111U (en) | Direct-current ice melting system applied to overhead ground wire and direct-current ice melting equipment thereof | |
| CN210416940U (en) | Marine power system for water quality monitoring | |
| CN107658971B (en) | Portable emergency power supply with direct-current ice melting function | |
| CN106684795A (en) | Direct current deicing apparatus based on three-phase bridge type full-control structure | |
| CN202134875U (en) | Mobile series-connection direct-current ice melting device | |
| CN209217793U (en) | Electric ship mixing main power source system | |
| CN112234567A (en) | Novel uncontrolled direct current ice melting device and ice melting method thereof | |
| RU2235397C2 (en) | Ice glaze melting apparatus | |
| CN104577926B (en) | The test platform of wire ground wire combination DC ice melting can be realized | |
| CN204651854U (en) | A kind of ice-melt supply unit | |
| CN202749783U (en) | Direct current ice melting and static var compensation device | |
| CN111697598A (en) | Mode switching system and mode switching method for electrified railway | |
| CN102299499A (en) | Ice melting scheme of circuit alternating-current short circuit after voltage reduction for 10kV power supply through 35kV main transformer | |
| EP3229251B1 (en) | Direct-current interruption device | |
| CN104037704A (en) | DC (Direct Current)-based deicing and SVG (Static Var Generator) device capable of realizing stepless voltage regulation | |
| CN201234103Y (en) | Transmission line DC ice melting device capable of combined use | |
| CN203942248U (en) | Based on the DC de-icing device under 12-phase rectification with induced voltage inhibit feature | |
| CN203481758U (en) | Output switching system of direct current ice-melting device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request |
Effective date: 20190122 |