CN112242666B - Method for replacing outgoing cable of line with radial structure - Google Patents
Method for replacing outgoing cable of line with radial structure Download PDFInfo
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- CN112242666B CN112242666B CN202011048827.1A CN202011048827A CN112242666B CN 112242666 B CN112242666 B CN 112242666B CN 202011048827 A CN202011048827 A CN 202011048827A CN 112242666 B CN112242666 B CN 112242666B
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- 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
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/02—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for overhead lines or cables
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- 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
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/06—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for laying cables, e.g. laying apparatus on vehicle
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Abstract
The invention relates to the field of power distribution network maintenance methods, in particular to a method for replacing an outgoing cable of a radial structure line, which comprises the following steps: selecting an unused space switch interval below a power supply side bus of the overhead line with a radial structure for accessing a new laid cable; with the air switch interval as a starting point, laying a new cable to a tower on an overhead line in advance; connecting with an overhead line in a live working mode; when the line operating parameters meet a hot-fall condition, the original outgoing cables of the overhead line are shifted, replaced and reconnected in a hot-fall switching mode; and when the line operation parameters do not meet the hot switching condition, the original outgoing cables of the overhead lines are shifted, replaced and reconnected in a cold switching mode. The invention can change the overhead line and the users on the overhead line from the newly laid cable to supply power by adopting a hot-to-cold mode in advance when the outgoing cable is subjected to power failure maintenance and displacement replacement, thereby greatly reducing the loss of the number of users caused by line replacement and greatly improving the power supply reliability, the power operator environment and the satisfaction degree of the power consumption of the users.
Description
Technical Field
The invention relates to the field of power distribution network maintenance methods, in particular to a method for replacing an outgoing cable of a radial structure line.
Background
Along with the continuous development of national economy, urbanization of urbanization is continuously promoted, roads or cable trench bodies of certain road sections are excavated and repaired frequently because of municipal construction requirements, at the moment, underground outgoing cables under the roads or in the trench bodies are forced to be powered off to be shifted so as to avoid the influences of municipal construction and the like, but the outgoing cables are usually in a live-line running state, power is supplied to a looped network or a circuit connected with a wiring by virtue of an opposite side power supply II during shifting, the outgoing cables can be shifted, changed and connected in a power-off mode in a power-off shifting mode, and the fact that power consumption of users on the circuit is not influenced is guaranteed.
As shown in fig. 1, when the excavation and repair area 2 occurs in the outgoing cable 1 buried section between the power supply i and the overhead line, due to the existence of the opposite side power supply II, the operation mode of the overhead line can be changed from the original power transmission output of the power supply i to the power transmission output of the opposite side power supply II through the hot switching operation of the outgoing switch 3, and then the outgoing switch 3 in the excavation and repair area and the outgoing interval switch in the power supply i are disconnected, so that the outgoing cable in the excavation and repair area 2 is powered off, and the outgoing cable in the construction area is shifted and replaced in cooperation with the excavation and repair of the road, at this time, the users 1, 2, 3, 4 and 5 on the overhead line are supplied with power by the power supply II, and the normal power consumption is not affected.
However, for the radial structure line without the opposite side power supply II, as shown in fig. 2, when the outgoing cable 1 of the power supply i is buried in the section, which is required by municipal engineering construction, for excavation and repair, because the excavation and repair area 2 is located at the power head of the overhead line, the outgoing switch 3 in the repair area and the outgoing interval switch in the power supply i are disconnected, so that the rear-section radial structure overhead line is completely powered off, and the user 1, the user 2, the user 3, the user 4, and the user 5 are accompanied and stopped, until the excavation and repair of the outgoing cable is completed, or the outgoing cable is shifted, changed, and connected, the outgoing interval switch in the power supply i and the outgoing switch 3 in the repair area can be reconnected, and power supply to the user 1, the user 2, the user 3, the user 4, and the user 5 is restored.
Because the excavation and trimming work of municipal engineering construction or the time consumption of the displacement, replacement, re-connection and re-connection of the outgoing cable is long, for the radial structure line shown in fig. 2, the displacement, replacement, re-connection of the outgoing cable can generate great loss of the number of users in power failure, and the power supply reliability, the power operator environment and the satisfaction degree of the power consumption of the users are seriously influenced.
Disclosure of Invention
In order to solve the problems, the invention provides a method for replacing a line outgoing cable with a radial structure.
The invention provides a method for replacing an outgoing cable of a radial structure line, which comprises the following steps:
selecting an unused space isolation switch below a power supply side bus of the overhead line with a radial structure for accessing a new laid cable;
and with the space isolation switch as a starting point, laying a new outgoing cable to a tower which is convenient for the upper pole to be accessed on the overhead line in advance, namely selecting one tower which can newly lay the upper pole of the outgoing cable except the original upper pole of the outgoing cable of the overhead line.
After the newly laid outgoing cable is fed to the pole, a live working mode is adopted to newly install an outgoing switch, the newly installed outgoing switch is in a broken position, and then the newly laid outgoing cable, the newly installed outgoing switch and the overhead line are connected in a live working mode;
when the line operating parameters meet the hot-fall condition (the load, the phase angle difference and the like are less than or equal to the set threshold value, and the phase sequence is consistent), the original outgoing cable of the overhead line is shifted, replaced and reconnected by adopting a hot-fall switching mode (completely uninterrupted power supply), namely: firstly, closing a space switch used as a new outlet cable below a power side bus; and then closing the new outgoing switch after the phases are correct at two sides of the new outgoing switch of the upper rod of the newly laid outgoing cable overhead line, pulling the interval between the original outgoing cable switch and the original outgoing cable switch of the power supply side bus, and then shifting, replacing and reconnecting the original outgoing cable of the overhead line in a power failure mode.
After the original outgoing cable of the overhead line is subjected to power failure, displacement, replacement and reconnection, firstly closing an original outgoing cable interval switch of a power supply side bus, and then closing an original outgoing cable switch after the phases are faultless at two sides of the original outgoing cable switch; and finally, pulling apart the newly-installed outgoing switch and a spacing switch used as a newly-installed outgoing cable below the power supply side bus, dismantling the newly-installed outgoing switch and the leads at two sides in a live-line operation mode, dismantling the newly-installed outgoing cable, and recovering the operation mode of the original radial structure circuit.
When the line operating parameters do not satisfy the hot condition (load, phase angle difference and the like are greater than the set threshold value and phase sequence is inconsistent), the original outgoing cable of the overhead line is shifted, replaced and reconnected by adopting a cold switching mode (short-time power failure), namely: firstly, closing a space switch used as a new outlet cable below a power side bus; and after the phases on two sides of a new outgoing cable switch of the upper rod of the newly laid outgoing cable overhead line are correct, pulling the original outgoing cable switch open, closing the new outgoing cable switch, pulling the original outgoing cable interval switch of the power supply side bus open, and finally, shifting, replacing and reconnecting the original outgoing cable of the overhead line in a power failure mode.
After the original outgoing cable of the overhead line is subjected to power failure, displacement, replacement and reconnection, the original outgoing cable interval switch of the power supply side bus is closed, then after the phases on two sides of the original outgoing cable switch are correct, the newly-installed outgoing switch is pulled open, then the original outgoing cable switch is closed, then the interval switch which is used as the newly-installed outgoing cable below the power supply side bus is pulled open, and finally the leads on two sides of the newly-installed outgoing cable switch are detached in a live-line operation mode. And (4) removing the newly laid outgoing cable and recovering the operation mode of the original radial structure line.
Preferably, when the original outgoing cable of the overhead line is shifted, replaced and reconnected in a hot back-switching mode, the newly laid outgoing cable can be an engineering cable or a bypass flexible cable, and the newly installed outgoing switch can be an engineering section switch or a bypass load switch.
Preferably, when the original outgoing cable of the overhead line is shifted, replaced and reconnected in a cold-reverse switching mode, the newly laid outgoing cable can be an engineering cable or a bypass flexible cable, and the newly installed outgoing switch can be an engineering section switch or an engineering breaker switch or a bypass load switch.
Preferably, by adopting the method, when the newly-installed outgoing cable and the newly-installed outgoing switch are the engineering cable and the engineering breaker switch, the original outgoing cable and the outgoing switch can be replaced according to maintenance needs, namely, the original outgoing cable and the outgoing switch which need to be shifted and replaced are finally dismounted, and the newly-installed outgoing cable and the newly-installed outgoing switch are reserved to replace the original outgoing cable and the outgoing switch to normally supply power to the overhead line.
Preferably, if there is no unused space switch below the power supply side bus, the unused space switch or the mobile medium voltage power outlet space switch in the transformer substation, the switchyard or the ring network unit in which the ring network or the interconnection line has been put into operation is selected near the overhead line.
Preferably, the tower on which the newly laid outgoing cable is arranged can be a tower on the original overhead line, or a new upright pole without power outage in a live-line working mode, or a newly built branch line without power outage and led out to an upright pole at a proper position from the overhead line.
Preferably, the original outgoing cable of the overhead line is shifted, replaced and reconnected by adopting a hot back-off switching mode (completely uninterrupted power supply), or the original outgoing cable of the overhead line is shifted, replaced and reconnected by adopting a cold back-off switching mode (short-time power failure) in a power utilization valley period.
By using the present invention, the following effects can be achieved:
the method for replacing the outgoing cable of the line with the radial structure can change the overhead line and the users on the overhead line from the newly laid cable to supply power in a hot-to-cold mode in advance when the outgoing cable is subjected to power failure maintenance and displacement replacement, the users do not have power failure perception in the whole range by adopting the hot-to-cold mode, the overhead line only generates short-time power failure time of several minutes by adopting the cold-to-cold mode, and compared with the time consumption of at least several hours for once replacing the outgoing cable by adopting the power supply side power failure maintenance mode in a displacement replacement mode, the loss of the number of users caused by line migration and modification is greatly reduced, and the power supply reliability, the power operator environment and the satisfaction degree of power utilization of the users are greatly improved.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic diagram of a cable of an overhead line shifted and replaced during ring network or contact wiring;
FIG. 2 is a schematic diagram of a radial structure line shift replacement modified overhead line outgoing cable;
fig. 3 is a schematic flow chart of a method for replacing a radial line outgoing cable according to an embodiment of the present invention;
FIG. 4-1 is a schematic diagram of a newly laid outgoing cable and a newly installed outgoing switch during hot backward switching;
FIG. 4-2 is a schematic diagram of a newly laid outgoing cable and a newly installed outgoing switch during cold backward switching;
FIG. 5 is a schematic diagram of a radial configuration circuit being changed to be powered by a newly laid cable and a newly installed outlet switch;
FIG. 6 is a schematic diagram of a shifting, replacing and connecting process of an outgoing cable of an overhead line with a radial structure;
fig. 7 is a schematic diagram of a radial structure line displacement changed to a cable.
Note: 1. the method comprises the following steps of an original outgoing cable 2, an excavation and trimming area 3, an original outgoing switch 4, a new outgoing switch 5, a new laid cable 6 and an outgoing cable after displacement, replacement and reconnection.
Detailed Description
The technical solutions of the present invention will be further described below with reference to the accompanying drawings, but the present invention is not limited to these embodiments.
The basic idea of the invention is to lay a new engineering cable or flexible cable in the power supply side or in the transformer substation, switch station or ring network unit of the looped network or interconnection wiring or the mobile medium-voltage power supply outlet side near the overhead line, to connect the overhead line with the overhead line of the radial structure line through the new outlet switch, to supply power to the overhead line by two outlet cables, then to disconnect the switches of the original outlet cables at the two sides of the power supply and the overhead line to change and connect, after the change and connection work is finished, to operate the switches at the two sides of the original outlet cable, to restore the overhead line to be supplied with power by the two outlet cables, and finally to remove the new laying cable and the new outlet switch by adopting the live working mode. The newly laid engineering cable or the newly installed breaker outlet switch can directly replace the original outlet cable and the outlet switch to normally supply power to the overhead line. Therefore, the loss of the number of users caused by power failure, maintenance, displacement, replacement and change of the connecting outlet cable is avoided or greatly reduced, the power supply reliability and the user power utilization satisfaction degree are effectively improved, and huge economic benefits and social benefits are brought to enterprises.
Based on the above ideas, an embodiment of the present invention provides a method for replacing a line outgoing cable with a radial structure, as shown in fig. 3, including the following steps:
s1: and selecting an unused space isolation switch below the power supply side bus of the overhead line with the radial structure for accessing a new laid cable.
If no available space switch is arranged below the power supply side bus, other unused space switches or mobile medium-voltage power supply outgoing line space switches which are already put into operation and are used in a transformer substation, a switch station or a ring network unit of a ring network or a tie connection can be selected nearby the overhead line.
S2: and with the space isolation switch as a starting point, laying a new outgoing cable to a tower convenient for the upper pole to be connected onto the overhead line in advance.
The new cable can be an engineering cable or a flexible cable according to the situation. The tower of the newly laid cable upper pole can utilize the tower on the original overhead line, namely, the existing tower of the newly laid cable upper pole can be supplied at a position outside the original outlet cable upper pole of the overhead line, and the live working mode can also be adopted, so that the live new upright pole or the live new branch line is led out to a proper position from the overhead line, thereby facilitating the newly laid cable upper pole.
S3: and after the newly laid outgoing cable is fed onto the pole, a live working mode is adopted to newly install an outgoing switch, the newly installed outgoing switch is in an off position, and the newly laid outgoing cable, the newly installed outgoing switch and the overhead line are connected by the live working mode.
S4: when the line operation parameters meet the hot-fall condition (the load, the phase angle difference and the like are less than or equal to the set threshold value, and the phase sequence is consistent), the original outgoing cable of the overhead line is shifted, replaced and reconnected by adopting a hot-fall switching mode (completely uninterrupted power supply).
Before the work of municipal excavation and finishing in the outgoing cable area, shifting, replacing, changing, connecting and the like of the outgoing cable is started, a spacing switch which is used as a new outgoing cable below a power side bus is closed; and then closing the new outgoing switch after the phases are correct at two sides of the new outgoing switch of the pole on the overhead line of the newly laid outgoing cable, wherein two outgoing cables are arranged from the power supply side, and the overhead line is simultaneously supplied with power through different access points at the power supply side. Then the original outgoing cable switch and the original outgoing cable interval switch of the power side bus are pulled open, the overhead line is isolated by the new switch below the power side bus, the newly laid cable and the newly installed outgoing switch output power transmission and keep normal operation, the electricity consumption of the user on the overhead line is not influenced,
and (3) removing the leads and the outgoing cables on the two sides of the pole switch at the outgoing cable of the overhead line in a live working mode, and shifting, replacing and reconnecting the original outgoing cable of the overhead line in a power failure mode.
After the original outgoing cable of the overhead line is subjected to power failure, displacement, replacement and reconnection, leads on two sides of the original outgoing cable switch are lapped in a live working mode, and the outgoing cable subjected to displacement, replacement, reconnection and reconnection is connected with the overhead line. And closing the original outgoing cable interval switch of the power supply side bus, and closing the original outgoing switch after the phases are verified to be correct at two sides of the original outgoing cable switch, wherein the overhead line is simultaneously powered by the two outgoing cables.
And finally, pulling apart a newly-installed outlet switch and a spacing switch used as a new outlet cable below a power supply side bus, removing the newly-installed outlet switch and two side leads by adopting a live working mode, removing the newly-laid outlet cable, recovering the overhead line to a mode of operating a radial structure line supplied with power by the original power supply side spacing and the original outlet cable upper rod position, and switching the whole operation process by live working and hot reversing, wherein the power consumption of a user is not sensed by power failure, and the number of users is generated when the power failure does not exist.
In addition, newly laid engineering cables and newly installed circuit breaker switches can replace original outgoing cables and switches, and the original outgoing cable switches and outgoing cables on the overhead lines can be thoroughly removed in a live working mode.
S5: when the line operation parameters do not meet the hot-fall conditions (the load, the phase angle difference and the like are larger than set thresholds, and the phase sequence is inconsistent), the original outgoing cables of the overhead lines are shifted, replaced and reconnected by adopting a cold-fall switching mode (short-time power failure).
When the line operation parameters do not meet the hot-trip condition, the fault power loss caused by the switch tripping is avoided to possibly generate excessive inrush current at the moment when a newly-installed line switch is closed. The operation can also be carried out by adopting a cold-reverse switching mode, and a space switch which is used as a new outgoing cable below a power supply side bus is closed firstly; and after the phases on two sides of a new outgoing cable switch of the upper rod of the newly laid outgoing cable overhead line are correct, pulling the original outgoing cable switch open, closing the new outgoing cable switch, pulling the original outgoing cable interval switch of the power supply side bus open, and finally, shifting, replacing and reconnecting the original outgoing cable of the overhead line in a power failure mode. At the moment, the overhead line is fed by a newly used interval switch below a power supply side bus, a newly laid cable and a newly installed and uninstalled switch to keep normal operation, but short-time power failure with short interval time is generated in the switching process of the switch, and generally within a few minutes.
After the original outgoing cable of the overhead line is subjected to power failure, displacement, replacement and reconnection, the original outgoing cable interval switch of the power supply side bus is closed, then after the phases on two sides of the original outgoing cable switch are correct, the newly-installed outgoing switch is pulled open, then the original outgoing cable switch is closed, then the interval switch which is used as the newly-installed outgoing cable below the power supply side bus is pulled open, and finally the leads on two sides of the newly-installed outgoing cable switch are detached in a live-line operation mode. And (4) removing the newly laid outgoing cable and recovering the operation mode of the original radial structure line. At this time, in the switching process of the switch, a short interval time, generally a short-time power failure within several minutes, is generated again.
The cold switching mode of the switch is usually arranged in the power utilization valley time period such as in the morning, so that the influence on the power utilization of the user is reduced as much as possible. Compared with a power supply side full-stop displacement replacement-changed outlet cable, the loss of the number of households in power failure is greatly reduced.
Above-mentioned whole operation process, whole the adoption live working mode is gone on, except adopting the mode of cold falling switching can produce the power failure of a plurality of minutes of short-term twice, other periods can not produce the power failure.
In addition, newly laid engineering cables and newly installed circuit breaker switches can replace original outgoing cables and switches, and the original outgoing cable switches and outgoing cables on the overhead lines can be thoroughly removed in a live working mode.
Example one
In this embodiment, the outgoing cable is replaced by hot-reversing, and fig. 4-1 is a schematic diagram of a newly laid outgoing cable and a newly installed outgoing switch during hot-reversing switching. As shown in fig. 4-1, because the excavation trimming area 2 is on the path of the outgoing cable 1 of the overhead line, the outgoing cable of the overhead line needs to be shifted, replaced and reconnected, at this time, a space isolation switch below the power bus is selected as a starting point of a newly laid cable 5, the overhead line 2# rod is used as an end point for laying an engineering cable or a bypass flexible cable, the outgoing switch is newly installed on the 2# rod, and the newly installed outgoing switch is in an off position.
When the load switching is carried out in a hot-falling mode, firstly, a space switch below a power supply bus is closed, then, phases are checked at two sides of a newly-installed switch 4 of the 2# tower, the newly-installed switch of the 2# tower is closed after the situation that the phases are correct is confirmed, and at the moment, the overhead circuit is powered through an outgoing cable 1, an outgoing switch 3, a newly-laid cable 5 and the newly-installed switch 4 respectively at two intervals in the same power supply.
Fig. 5 is a schematic diagram of a radial structure circuit changed to be powered by a new laid cable and a new outgoing switch. As shown in fig. 5, the 1# rod outgoing line switch 3 is pulled open, the leads on the two sides of the switch are removed in a live working mode, and the outgoing line cable 1 on the 1# rod is removed; or the cable on the pole is reserved according to construction needs, and a sufficient safe distance is kept between the cable and the outgoing switch and the charged body, and at the moment, the overhead line is powered by a mode of using a newly laid cable 5 and a newly installed outgoing switch 4 at an interval below a bus in the power supply.
Fig. 6 is a schematic diagram of the displacement, replacement and reconnection process of the outgoing cable of the overhead line with the radial structure. As shown in fig. 6, the original outgoing cable interval switch under the power supply internal bus is disconnected, and the outgoing cable 6 is replaced and connected by adopting a power failure maintenance mode. After the outgoing cable is shifted, replaced and reconnected, the outgoing cable interval switch below the internal bus of the power supply is closed, and the outgoing switch 3 is closed after the phase error is detected at the two sides of the outgoing switch at the fault position. At the moment, the overhead line is powered by two intervals in the same power supply through the outgoing cable 1, the outgoing switch 3, the newly laid cable 5 and the newly installed switch 4.
Fig. 7 is a schematic diagram of a radial structure line displacement changed to a cable. As shown in fig. 6, the newly-installed outgoing switch 4 and the newly-laid outgoing cable interval switch below the power supply internal bus are disconnected, the newly-installed switch lead and the switch on the 2# rod are disassembled in a live working mode, the newly-laid cable 5 is disassembled and recovered, the overhead line is changed to the original running mode unchanged, and only the outgoing cable position is changed according to the excavation and repair requirements.
In the embodiment, as the core phase and loop hot reversing mode is adopted to switch the power supply of the overhead line, no short-time power failure exists in the whole process, the loss of the number of the users is zero in the power failure, the cable replacement needs at least several hours compared with the normal power failure maintenance displacement, the number of the users is dozens of times compared in the power failure, the loss of the number of the users in the power failure is not generated, and the power supply reliability and the power operator environment are greatly improved.
Example two:
in the second embodiment, the outgoing cable is replaced in a cold pouring mode. As shown in fig. 4-2, because the excavation trimming area 2 is on the path of the outgoing cable 1 of the overhead line, the outgoing cable of the overhead line needs to be shifted, replaced and reconnected, at this time, the space below the power bus is selected as the starting point of new laying cable, the overhead line 2# rod is used as the end point for laying engineering cable or bypass flexible cable, the outgoing switch is newly installed on the 2# rod, and the newly installed outgoing switch is in the off position.
The power supply is switched by adopting a cold reverse switching mode, firstly, a space switch below a power bus is switched on, after the two sides of a 2# rod new outgoing line switch are checked to be correct, the 1# rod outgoing line switch 3 is switched off, then the 2# rod new outgoing line switch 4 is switched on, and at the moment, the overhead line is powered by a mode of newly laying a cable 5 and newly arranging the outgoing line switch 4 through the space below the bus in the power supply. During the above operation, a short power cut, typically within a few minutes, is generated on the overhead line.
As shown in fig. 5, the live working mode is adopted, the leads at the two sides of the switch are removed, and the outgoing cable 1 on the # 1 rod is removed; or the cable on the rod is reserved according to construction needs, and a sufficient safety distance is kept between the cable and the switch and the electrified body.
As shown in fig. 6, the original outgoing cable interval switch under the power supply internal bus is disconnected, and the outgoing cable is replaced and changed in a power failure maintenance mode. After the outgoing cable is shifted, replaced and reconnected, the original outgoing cable interval switch below the bus in the power supply is closed, after the phases are checked to be correct at two sides of the outgoing switch at the disconnected position, the 2# rod is firstly pulled open to newly install the outgoing switch 4, then the 1# rod outgoing switch 3 is closed, and at the moment, the overhead line is powered by the original interval in the power supply, the shifted and reconnected outgoing cable 6 and the original outgoing switch 3. During this operation, the overhead line again generates a short power outage, typically within minutes, with a very short interval.
Disconnecting a newly laid outgoing cable interval switch below a bus in a power supply, removing a newly installed switch lead and a switch on a 2# rod in a live working mode, removing and withdrawing a newly laid cable, changing an overhead line to an original running mode unchanged, only changing the outgoing cable position according to municipal engineering construction excavation and finishing requirements, and changing a path, as shown in fig. 7.
In this embodiment, because the power supply of the overhead line is switched by adopting a cold-down mode, a short-time power failure of two times of minutes occurs on the overhead line, taking fig. 7 as an example, the cumulative duration of two short-time power failures is longest 20 minutes, the house number loss during power failure is (5 × 1/3) × 2 ≈ 1.67 hours per house, at least several hours are needed compared with the normal power failure maintenance displacement cable replacement, and the house number loss during power failure is dozens of times of comparison, so that the house number loss during power failure is greatly reduced, and the power supply reliability and the power operator environment are effectively improved.
Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (9)
1. A method for replacing a line outgoing cable with a radial structure is characterized by comprising the following steps:
selecting an unused space isolation switch below a power supply side bus of the overhead line with a radial structure for accessing a new laid cable;
with the space isolation switch as a starting point, laying a new outgoing cable to a tower convenient for the upper pole to be connected onto the overhead line in advance;
after the newly laid outgoing cable is fed to the pole, a live working mode is adopted to newly install an outgoing switch, the newly installed outgoing switch is in a broken position, and then the newly laid outgoing cable, the newly installed outgoing switch and the overhead line are connected in a live working mode;
when the line operating parameters meet a hot-fall condition, the original outgoing cables of the overhead line are shifted, replaced and reconnected in a hot-fall switching mode;
after the original outgoing cable of the overhead line is subjected to power failure, displacement, replacement and reconnection, firstly closing an original outgoing cable interval switch of a power supply side bus, and then closing an original outgoing cable switch after the phases are faultless at two sides of the original outgoing cable switch; finally, pulling apart a newly-installed outgoing switch and a spacing switch used as a newly-installed outgoing cable below a power supply side bus, removing the newly-installed outgoing switch and leads at two sides by adopting a live working mode, removing the newly-installed outgoing cable, and recovering the original radial structure circuit operation mode;
when the line operation parameters do not meet the hot-fall condition, the original outgoing cables of the overhead line are shifted, replaced and reconnected in a cold-fall switching mode;
after the original outgoing cable of the overhead line is subjected to power failure, displacement, replacement and reconnection, firstly, closing an original outgoing cable interval switch of a power supply side bus, then, after the phases on two sides of the original outgoing cable switch are correct, firstly, pulling out a newly-installed outgoing switch, then, closing the original outgoing cable switch, then, pulling out an interval switch which is used as a new outgoing cable below the power supply side bus, and finally, dismantling leads on two sides of the newly-installed outgoing switch in a live-line operation mode, dismantling the newly-installed outgoing cable and recovering the operation mode of the original radial structure line.
2. The method for replacing the outgoing cable of the radial line structure according to claim 1, wherein the step of performing replacement and reconnection on the original outgoing cable of the overhead line in a hot back-switching manner comprises the following steps:
firstly, closing a space switch used as a new outlet cable below a power side bus; and then closing the new outgoing switch after the phases are correct at two sides of the new outgoing switch of the upper rod of the newly laid outgoing cable overhead line, pulling the original outgoing cable switch and the original outgoing cable interval switch of the power supply side bus, and then shifting, replacing and reconnecting the original outgoing cable of the overhead line in a power failure mode.
3. The method for replacing the outgoing cable of the radial line structure according to claim 1, wherein the step of performing replacement and reconnection on the original outgoing cable of the overhead line in a cold-reverse switching mode comprises the following steps:
firstly, closing a space switch used as a new outlet cable below a power side bus; and after the phases on two sides of a new outgoing cable switch of the upper rod of the newly laid outgoing cable overhead line are correct, pulling the original outgoing cable switch open, closing the new outgoing cable switch, pulling the original outgoing cable interval switch of the power supply side bus open, and finally, shifting, replacing and reconnecting the original outgoing cable of the overhead line in a power failure mode.
4. The method for replacing the outgoing cable of the radial structure line as claimed in claim 1, wherein when the original outgoing cable of the overhead line is replaced and reconnected by hot back-switching, the newly laid outgoing cable is an engineering cable, and the newly installed outgoing switch is an engineering section switch.
5. The method for replacing the outgoing cable of the radial line structure according to claim 1, wherein when the original outgoing cable of the overhead line is replaced and reconnected by cold reverse switching, the newly laid outgoing cable is an engineering cable, and the newly installed outgoing switch is an engineering section switch.
6. The method for replacing the outgoing cable of the radial structure circuit as claimed in claim 4 or 5, wherein when the newly laid outgoing cable is an engineering cable and the newly installed outgoing switch is an engineering breaker switch, the original outgoing cable and the outgoing switch are replaced according to the maintenance requirement.
7. The method for replacing the outgoing cable of the radial-structure line as claimed in claim 1, wherein if there is no unused space switch below the power-side bus, the unused space switch or the mobile medium-voltage power outgoing space switch in the transformer substation, the switch station or the ring network unit of the looped network or the interconnection line which has been put into operation is selected nearby near the overhead line.
8. The method for replacing the outgoing cable of the radial-structure line as claimed in claim 1, wherein the tower on which the outgoing cable is newly laid is a tower on an original overhead line, or a new upright pole without power cut is adopted in a live-line operation mode, or a newly-built branch line is led out from the overhead line to a pole at a proper position without power cut.
9. The method as claimed in claim 1, wherein the original outgoing cables of the overhead line are replaced by hot switching or cold switching during the off-peak period.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011048827.1A CN112242666B (en) | 2020-09-29 | 2020-09-29 | Method for replacing outgoing cable of line with radial structure |
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