CN114498313A - Flexible connecting bus bridge and switch cabinet transitional connection method - Google Patents
Flexible connecting bus bridge and switch cabinet transitional connection method Download PDFInfo
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- CN114498313A CN114498313A CN202210122419.9A CN202210122419A CN114498313A CN 114498313 A CN114498313 A CN 114498313A CN 202210122419 A CN202210122419 A CN 202210122419A CN 114498313 A CN114498313 A CN 114498313A
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- cabinet
- switch cabinet
- interconnection
- flexible
- bus
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/20—Bus-bar or other wiring layouts, e.g. in cubicles, in switchyards
- H02B1/202—Cable lay-outs
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/20—Bus-bar or other wiring layouts, e.g. in cubicles, in switchyards
- H02B1/22—Layouts for duplicate bus-bar selection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B3/00—Apparatus specially adapted for the manufacture, assembly, or maintenance of boards or switchgear
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- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
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Abstract
The invention discloses a flexible interconnection bus bridge and a switch cabinet transition connection method. The flexible connecting bus bridge comprises a cable, a first cable terminal head accessory, a second cable terminal head accessory, a first wiring lug and a second wiring lug; a first end of the cable is connected with the first cable termination accessory, and a second end of the cable is connected with the second cable termination accessory; the first wiring lug is connected with the first cable terminal accessory, and the second wiring lug is connected with the second cable terminal accessory; the first wiring lug and the second wiring lug are respectively connected with a busbar of the isolation cabinet or the switch cabinet. The technical scheme of the embodiment of the invention realizes the uninterrupted switching operation of the new switch cabinet and the old switch cabinet with different sizes, and meets the requirement of users on electric energy.
Description
Technical Field
The invention relates to the technical field of power supply and distribution, in particular to a transition connection method for a flexible interconnection bus bridge and a switch cabinet.
Background
The switch cabinet is a quite important device in the power grid, and the operation condition of the switch cabinet directly influences the safety and stability of the power grid. When the switch cabinet has the conditions of ageing of equipment components, high failure rate and the like, the switch cabinet needs to be modified, and a user generally selects the technical scheme of original transformation by combining comprehensive factors such as investment, field, construction condition and the like of the modification.
In some important electricity utilization occasions, the main wiring mode of the bus is generally set to be in a single bus section mode. Because the electricity consumption user is important, the user must be ensured not to cut off the power, and when the old switch cabinet is transformed, the old switch cabinet cannot be dismantled after the power of two sections of buses is cut off. When switching operation is required, because the sizes of the new switch cabinet and the old switch cabinet are different, uninterrupted load transfer is difficult to realize.
The uninterrupted switching operation of the existing new switch cabinet and the old switch cabinet with different sizes becomes a problem to be solved urgently in the industry.
Disclosure of Invention
The invention provides a flexible interconnection bus bridge and a switch cabinet transition connection method, which are used for achieving the effect of uninterrupted switching operation of a new switch cabinet and an old switch cabinet with different sizes.
According to an aspect of the present invention, there is provided a flexible communication bus bridge comprising:
the cable terminal comprises a cable, a first cable terminal head accessory, a second cable terminal head accessory, a first wiring lug and a second wiring lug;
a first end of the cable is connected with the first cable termination accessory, and a second end of the cable is connected with the second cable termination accessory;
the first wiring lug is connected with the first cable terminal accessory, and the second wiring lug is connected with the second cable terminal accessory;
the first wiring lug and the second wiring lug are respectively connected with a busbar of the isolation cabinet or the switch cabinet.
Optionally, the flexible bus bar bridge further comprises: a suspension arm of a transition bus bridge is arranged,
the transition bus bridge suspension arm is fixed on the roof of the space where the switch cabinet and/or the isolation cabinet are/is located; the cable is fixed to the roof through the transition bus bridge boom.
According to a second aspect of the present invention, a switch cabinet transition connection method is provided, which is applied to a distribution line, where the distribution line includes a first bus bar and a second bus bar, and the first bus bar is provided with a first switch device, a first interconnection switch cabinet and a first isolation cabinet; the second bus is provided with second switch equipment, a second connection switch cabinet and a second isolation cabinet;
the first end of the first switch device is connected with a first power supply, the second end of the first switch device is connected with a first load, the second end of the first switch device is connected with the first end of the first isolation cabinet, the second end of the first isolation cabinet is connected with the first end of the first interconnection switch, and the second end of the first interconnection switch is connected with the second end of the second interconnection switch;
the first end of the second switch device is connected with a second power supply, the second end of the second switch device is connected with a second load, the second end of the second switch device is connected with the first end of the second isolation cabinet, and the second end of the second isolation cabinet is connected with the first end of the second connection switch;
the switch cabinet transition connection method comprises the following steps:
manufacturing a flexible connecting bus bridge; the flexible communication bus bridge comprises a cable, a first cable terminal accessory, a second cable terminal accessory, a first wiring lug and a second wiring lug; a first end of the cable is connected with the first cable termination accessory, and a second end of the cable is connected with the second cable termination accessory; the first wiring lug is connected with the first cable terminal accessory, and the second wiring lug is connected with the second cable terminal accessory;
connecting the second tie switch cabinet to the first isolation cabinet through the flexible tie bus bridge;
dismantling the first interconnection switch cabinet and installing a new first interconnection switch cabinet;
connecting the new first interconnection switch cabinet with the second isolation cabinet through the flexible interconnection bus bar bridge;
and (4) dismantling the second contact switch cabinet and installing a new second contact switch cabinet.
Optionally, after the second switchgear cabinet is removed and a new second switchgear cabinet is installed, the method further includes:
and installing a new bus-bar bridge between the new second interconnection switch cabinet and the new first interconnection switch cabinet, and taking the flexible interconnection bus-bar bridge out of operation.
Optionally, the removing the first interconnection switch cabinet and installing a new first interconnection switch cabinet includes:
dismantling a first interconnection switch cabinet and an outlet cable of the first interconnection switch cabinet, and installing a new first interconnection switch cabinet;
and restoring to install the outlet cable of the new first interconnection switch cabinet.
Optionally, the removing the second gang switch cabinet and installing a new second gang switch cabinet includes:
removing outlet cables of a second contact switch cabinet and the second contact switch cabinet, and installing a new second contact switch cabinet; and restoring to install the outlet cable of the new second connection switch cabinet.
Optionally, the connecting the new first interconnection switchgear to the second isolation switchgear through the flexible interconnection bus bar bridge includes:
extending the first end of the flexible interconnection bus-bar bridge from the upper end cover behind the first interconnection switch cabinet to the bottom of the cabinet, and mounting the first end on the lower end bus-bar of the first interconnection switch cabinet; the second end of the flexible connecting bus bar bridge extends downwards into the bottom of the cabinet from the upper end cover behind the second isolation cabinet and is installed on the lower end bus bar;
and transferring a second load connected with the second interconnection switch cabinet to the first interconnection switch cabinet through the flexible interconnection bus bridge, and taking the second interconnection switch cabinet out of operation.
Optionally, the connecting the second interconnection switchgear to the first isolation switchgear through the flexible interconnection bus bridge includes:
extending the first end of the flexible connecting bus-bar bridge downwards into the bottom of the cabinet from the upper end cover behind the second connecting switch cabinet, and installing the first end on a lower end bus-bar of the second connecting switch cabinet; the second end of the flexible connecting bus bar bridge extends downwards into the bottom of the cabinet from the upper end cover behind the first isolation cabinet and is arranged on the lower end bus bar;
and transferring the first load connected with the first interconnection switch cabinet to the second interconnection switch cabinet through the flexible interconnection bus bar bridge, and withdrawing the first interconnection switch cabinet from operation.
Optionally, the connecting the new first interconnection switchgear to the second isolation switchgear through the flexible interconnection bus bar bridge includes:
the first wiring lug of the flexible interconnection bus bar bridge is connected with a lower end busbar of the first interconnection switch cabinet;
and the second wiring lug of the flexible connecting bus bridge is connected with the lower end busbar of the second isolation cabinet.
Optionally, the connecting the second interconnection switchgear to the first isolation switchgear through the flexible interconnection bus bridge includes: the first wiring lug of the flexible interconnection bus bar bridge is connected with a lower end busbar of the second interconnection switch cabinet;
and the second wiring lug of the flexible connecting bus bridge is connected with the lower end bus bar of the first isolation cabinet.
The technical scheme of the embodiment of the invention comprises the steps that a flexible connecting bus bridge is arranged, wherein the flexible connecting bus bridge comprises a cable, a first cable terminal accessory, a second cable terminal accessory, a first wiring lug and a second wiring lug; a first end of the cable is connected with the first cable termination accessory, and a second end of the cable is connected with the second cable termination accessory; the first wiring lug is connected with the first cable terminal accessory, and the second wiring lug is connected with the second cable terminal accessory; the first wiring lug and the second wiring lug are respectively connected with the isolation cabinet or a busbar of the switch cabinet, so that uninterrupted switching operation of a new switch cabinet and an old switch cabinet with different sizes is realized, and the requirement of a user on electric energy is met.
It should be understood that the statements in this section do not necessarily identify key or critical features of the embodiments of the present invention, nor do they necessarily limit the scope of the invention. Other features of the present invention will become apparent from the following description.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a flexible interconnecting bus bridge according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of another flexible interconnecting bus bridge according to an embodiment of the present invention;
fig. 3 is a flowchart of a switch cabinet transition connection method according to an embodiment of the present invention;
fig. 4 is a flowchart of another switch cabinet transition connection method provided by the embodiment of the invention;
fig. 5 is a flowchart of another switch cabinet transition connection method according to an embodiment of the present invention;
fig. 6 is a flowchart of another switch cabinet transition connection method according to an embodiment of the present invention;
fig. 7 is a flowchart of another switch cabinet transition connection method according to an embodiment of the present invention;
fig. 8 is a flowchart of another switch cabinet transition connection method according to an embodiment of the present invention;
fig. 9 is a flowchart of another switch cabinet transition connection method according to an embodiment of the present invention;
fig. 10 is a flowchart of another switch cabinet transition connection method according to an embodiment of the present invention;
fig. 11 is a main wiring diagram of a 35kV power supply system provided by the embodiment of the invention;
fig. 12 is a layout diagram of a 35kV switch cabinet provided by the embodiment of the invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in other sequences than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a schematic structural diagram of a flexible connecting bus bridge according to an embodiment of the present invention. Referring to fig. 1, a flexible interconnection bus bridge according to an embodiment of the present invention includes a cable 1, a first cable termination accessory 2, a second cable termination accessory 3, and first and second terminal lugs 4 and 5; the first end of the cable 1 is connected with a first cable terminal accessory 2, and the second end of the cable 1 is connected with a second cable terminal accessory 3; the first wiring lug 4 is connected with the first cable terminal accessory 2, and the second wiring lug 5 is connected with the second cable terminal accessory 3; the first wiring lug 4 and the second wiring lug 5 are respectively connected with a busbar 10 of the isolation cabinet or the switch cabinet.
Specifically, the length of the cable 1 can be set as required, and the position errors of the bus coupler and the bus coupler isolation cabinet of the old switch cabinet and the new switch cabinet do not need to be considered, so that the cable is suitable for various position deviations between the old switch cabinet and the new switch cabinet. The first cable termination accessory 2 can be connected with the first end of the cable 1 in advance, the second cable termination accessory 3 can be connected with the second end of the cable 1, relevant test work is well done, and the cable termination accessory has the condition of being capable of being installed at any time. Therefore, the time for connecting the two sections of bus equipment is shortest, the risk that non-bus-connection equipment such as a new switch cabinet and an old switch cabinet performs switching operation is reduced, and the power supply reliability is improved. The first wiring lug 4 and the second wiring lug 5 are respectively connected with a busbar 10 of an isolation cabinet or a switch cabinet, and the first wiring lug 4 and the second wiring lug 5 are simple to manufacture, flexible and convenient to mount and can be used repeatedly. After the flexible connecting bus bridge is used and removed, the flexible connecting bus bridge can be used in other occasions.
The flexible communication bus bridge provided by the embodiment comprises a cable, wherein a first end of the cable is connected with a first wiring lug through a first cable terminal accessory, and a second end of the cable is connected with a second wiring lug through a second cable terminal accessory; first wiring lug and second wiring lug are used for being connected with the female arranging of isolation cabinet or cubical switchboard respectively, make the isolation cabinet and/or cubical switchboard that the size is inequality like this, are convenient for pass through flexible contact generating line bridging, are convenient for shift the load of old cubical switchboard to the load of new cubical switchboard, realize the load shift between the new cubical switchboard and the old cubical switchboard of size difference, have improved the reliability of power supply.
Alternatively, fig. 2 is a schematic diagram of another flexible bus bar bridge according to an embodiment of the present invention. Referring to fig. 2, the flexible interconnection bus bar bridge provided by the embodiment of the present invention may further include a transition bus bar bridge boom 6, wherein the transition bus bar bridge boom 6 is fixed on the roof of the space where the switch cabinet and/or the isolation cabinet are located; the cable 1 is fixed to the roof by means of a transition bus bridge boom 6.
Specifically, set up like this and make flexible contact generating line bridge be fixed in on the roof through transition generating line bridge davit 6, avoid walking the handcart that line influence cubical switchboard or isolation cabinet of flexible contact generating line bridge to open, further promote the practicality of flexible contact generating line bridge.
Fig. 3 is a flowchart of a switch cabinet transition connection method according to an embodiment of the present invention. Referring to fig. 3, the switch cabinet transition connection method provided by the embodiment of the present invention is applied to a distribution line, where the distribution line includes a first bus and a second bus, and the first bus is provided with a first switch device, a first interconnection switch cabinet and a first isolation cabinet; the second bus is provided with second switch equipment, a second connection switch cabinet and a second isolation cabinet; the first end of the first switch device is connected with a first power supply, the second end of the first switch device is connected with a first load, the second end of the first switch device is connected with the first end of the first isolation cabinet, the second end of the first isolation cabinet is connected with the first end of the first interconnection switch, and the second end of the first interconnection switch is connected with the second end of the second interconnection switch; the first end of the second switch device is connected with a second power supply, the second end of the second switch device is connected with a second load, the second end of the second switch device is connected with the first end of the second isolation cabinet, and the second end of the second isolation cabinet is connected with the first end of the second connection switch.
The switch cabinet transition connection method provided by the embodiment of the invention comprises the following steps:
s101, manufacturing a flexible connecting bus bridge; the flexible communication bus bridge comprises a cable, a first cable terminal accessory, a second cable terminal accessory, a first wiring lug and a second wiring lug; a first end of the cable is connected with the first cable termination accessory, and a second end of the cable is connected with the second cable termination accessory; the first wiring lug is connected with the first cable terminal accessory, and the second wiring lug is connected with the second cable terminal accessory.
Specifically, the flexible connecting bus bridge is manufactured before load transfer, so that the switching operation time can be saved.
S102, connecting the second connection switch cabinet with the first isolation cabinet through the flexible connection bus bridge.
Specifically, the second interconnection switch cabinet is connected with the first isolation cabinet through the flexible interconnection bus bar bridge, the load of the first interconnection switch cabinet is transferred to the second bus bar, and the original load of the first bus bar is supplied with power through the second bus bar.
S103, removing the first interconnection switch cabinet and installing a new first interconnection switch cabinet.
Specifically, the first interconnection switch cabinet is removed, and a new first interconnection switch cabinet is installed. The dimensions of the new first tie switchgear are different from the dimensions of the first tie switchgear.
And S104, connecting the new first interconnection switch cabinet with the second isolation cabinet through the flexible interconnection bus bar bridge.
Specifically, the load of the second bus is transferred to a new first interconnection switch cabinet through the flexible interconnection bus bridge, so that the first bus supplies power to the load of the second bus through the new first interconnection switch cabinet.
And S105, detaching the second contact switch cabinet and installing a new second contact switch cabinet.
Specifically, the second switchgear cabinet is removed, and a new second switchgear cabinet is installed, where the size of the new second switchgear cabinet is different from the size of the second switchgear cabinet. The new first tie switchgear may be sized the same as the new second tie switchgear.
According to the transitional connection method of the switch cabinet, provided by the embodiment of the invention, the flexible connection bus bridge is manufactured; connecting the second tie switch cabinet to the first isolation cabinet through the flexible tie bus bridge; the first interconnection switch cabinet is removed, and a new first interconnection switch cabinet is installed; connecting the new first interconnection switch cabinet with the second isolation cabinet through the flexible interconnection bus bridge; demolish the second contact cubical switchboard to install new second contact cubical switchboard, realized that the size at new first contact cubical switchboard and first contact cubical switchboard is different, realize through flexible contact generating line bridge under the circumstances that the load does not cut off the power supply, switch over the first load of first bus to the second bus, and switch over the second load of second bus to first bus, realize the not outage switching operation of the new cubical switchboard that the size is different and old cubical switchboard, satisfy the demand of user to the electric energy.
Optionally, fig. 4 is a flowchart of another switch cabinet transition connection method provided in the embodiment of the present invention. On the basis of the above embodiment, referring to fig. 4, the switch cabinet transition connection method provided by the embodiment of the invention includes:
s101, manufacturing a flexible connecting bus bridge.
S102, connecting the second connection switch cabinet with the first isolation cabinet through the flexible connection bus bridge.
S103, removing the first interconnection switch cabinet and installing a new first interconnection switch cabinet.
And S104, connecting the new first interconnection switch cabinet with the second isolation cabinet through the flexible interconnection bus bar bridge.
And S105, detaching the second contact switch cabinet and installing a new second contact switch cabinet.
S201, installing a new bus connection bus bridge between the new second connection switch cabinet and the new first connection switch cabinet, and enabling the flexible bus connection bridge to be out of operation.
Specifically, because the new second tie switch cabinet is the same as the new first tie switch cabinet in size, a new bus-tie bus bridge is installed between the new second tie switch cabinet and the new first tie switch cabinet, and the flexible bus-tie bridge is removed from operation, so that the new second tie switch cabinet and the new first tie switch cabinet are connected through the new bus-tie bus bridge, and the first bus and the second bus are mutually standby.
Optionally, fig. 5 is a flowchart of another switch cabinet transition connection method according to an embodiment of the present invention. Referring to fig. 5, the switch cabinet transition connection method provided by the embodiment of the invention includes:
s101, manufacturing a flexible connecting bus bridge.
S102, connecting the second connection switch cabinet with the first isolation cabinet through the flexible connection bus bridge.
S301, removing a first interconnection switch cabinet and an outlet cable of the first interconnection switch cabinet, and installing a new first interconnection switch cabinet; and recovering and installing the outlet cable of the new first interconnection switch cabinet.
Specifically, the cable of being qualified for the next round of competitions of first interconnection cubical switchboard is used for connecting first isolation cabinet, resumes installing the cable of being qualified for the next round of competitions of new first interconnection cubical switchboard for new first interconnection cubical switchboard is connected with first isolation cabinet through the cable of being qualified for the next round of competitions.
And S104, connecting the new first interconnection switch cabinet with the second isolation cabinet through the flexible interconnection bus bar bridge.
And S105, detaching the second contact switch cabinet and installing a new second contact switch cabinet.
Optionally, fig. 6 is a flowchart of another switch cabinet transition connection method according to an embodiment of the present invention. Referring to fig. 6, the switch cabinet transition connection method provided by the embodiment of the invention includes:
s101, manufacturing a flexible connecting bus bridge.
S102, connecting the second connection switch cabinet with the first isolation cabinet through the flexible connection bus bridge.
S103, removing the first interconnection switch cabinet and installing a new first interconnection switch cabinet.
And S104, connecting the new first interconnection switch cabinet with the second isolation cabinet through the flexible interconnection bus bar bridge.
S401, removing outlet cables of a second contact switch cabinet and the second contact switch cabinet, and installing a new second contact switch cabinet; and restoring to install the outlet cable of the new second connection switch cabinet.
Specifically, the outgoing cable of the second contact switch cabinet is used for connecting the second isolation cabinet, and installation of a new outgoing cable of the second contact switch cabinet is resumed, so that the new second contact switch cabinet is connected with the second isolation cabinet through the outgoing cable.
Optionally, fig. 7 is a flowchart of another switch cabinet transition connection method according to an embodiment of the present invention. Referring to fig. 7, the switch cabinet transition connection method provided by the embodiment of the invention includes:
s101, manufacturing a flexible connecting bus bridge.
S102, connecting the second connection switch cabinet with the first isolation cabinet through the flexible connection bus bridge.
S103, removing the first interconnection switch cabinet and installing a new first interconnection switch cabinet.
S501, extending the first end of the flexible interconnection bus bar bridge downwards into the cabinet bottom from the upper end cover behind the first interconnection switch cabinet, and installing the first end of the flexible interconnection bus bar bridge on a lower end bus bar of the first interconnection switch cabinet; and the second end of the flexible connecting bus bridge extends downwards into the cabinet bottom from the upper end cover behind the second isolation cabinet and is arranged on the lower end bus bar.
Specifically, set up like this and make the first end of flexible interconnection generating line bridge down stretch into at the bottom of the cabinet from the upper end cover behind the first interconnection cubical switchboard, install on the female row of the lower extreme of first interconnection cubical switchboard. The second end of flexible contact bus bridge is kept apart the upper end cover behind the cabinet from the second and is down stretched into at the bottom of the cabinet, installs on female arranging of lower extreme, makes first contact cubical switchboard keep apart the female row of lower extreme of cabinet and second through female arranging of its lower extreme and be connected, realizes shifting the load of second generating line to first contact cubical switchboard.
S502, transferring a second load connected with the second interconnection switch cabinet to the first interconnection switch cabinet through the flexible interconnection bus bridge, and enabling the second interconnection switch cabinet to be out of operation.
In particular, the second switchgear cabinet can be taken out of operation by opening a circuit breaker connected to the second switchgear cabinet.
And S105, detaching the second contact switch cabinet and installing a new second contact switch cabinet.
Optionally, fig. 8 is a flowchart of another switch cabinet transition connection method provided in an embodiment of the present invention. Referring to fig. 8, the switch cabinet transition connection method provided by the embodiment of the invention includes:
s101, manufacturing a flexible connecting bus bridge.
S601, extending the first end of the flexible connection bus bridge downwards into the cabinet bottom from the upper end cover behind the second connection switch cabinet, and installing the first end on a lower end bus bar of the second connection switch cabinet; and the second end of the flexible connecting bus bridge extends downwards into the cabinet bottom from the upper end cover behind the first isolation cabinet and is arranged on the lower end bus bar.
Specifically, set up like this and make the first end of flexible contact generating line bridge down stretch into at the bottom of the cabinet through the upper end cover behind the second contact cubical switchboard, install on female arranging of the lower extreme of second contact cubical switchboard. The second end of flexible tie bus bridge is installed on female arranging of lower extreme from the upper end cover down stretching into at the bottom of the cabinet behind the first isolation cabinet, realizes shifting the load of first generating line to second tie cubical switchboard.
S602, transferring a first load connected with the first interconnection switch cabinet to the second interconnection switch cabinet through the flexible interconnection bus bridge, and enabling the first interconnection switch cabinet to be out of operation.
Specifically, the first tie switch cabinet can be taken out of operation by disconnecting the circuit breaker connected with the first tie switch cabinet.
S103, removing the first interconnection switch cabinet and installing a new first interconnection switch cabinet.
And S104, connecting the new first interconnection switch cabinet with the second isolation cabinet through the flexible interconnection bus bar bridge.
And S105, detaching the second contact switch cabinet and installing a new second contact switch cabinet.
Optionally, fig. 9 is a flowchart of another switch cabinet transition connection method provided in an embodiment of the present invention. Referring to fig. 9, the switch cabinet transition connection method provided by the embodiment of the invention includes:
s101, manufacturing a flexible connecting bus bridge.
S102, connecting the second connection switch cabinet with the first isolation cabinet through the flexible connection bus bridge.
S103, removing the first interconnection switch cabinet and installing a new first interconnection switch cabinet.
S701, connecting the first wiring lug of the flexible interconnection bus bar bridge with a lower end bus bar of the first interconnection switch cabinet; and the second wiring lug of the flexible connecting bus bridge is connected with the lower end busbar of the second isolation cabinet.
Specifically, the material of first wiring lug and second wiring lug is soft, and the female row of the lower extreme of being convenient for first wiring lug and first interconnection cubical switchboard is reliably connected, and the female row of the lower extreme of second wiring lug and second isolation cabinet is connected, and does not receive the size restriction of first wiring lug and second wiring lug.
And S105, detaching the second contact switch cabinet and installing a new second contact switch cabinet.
Optionally, fig. 10 is a flowchart of another switch cabinet transition connection method according to an embodiment of the present invention. Referring to fig. 10, the switch cabinet transition connection method provided by the embodiment of the invention includes:
s101, manufacturing a flexible connection bus bridge.
S801, connecting the first wiring lug of the flexible connection bus bar bridge with a lower end bus bar of the second connection switch cabinet; and the second wiring lug of the flexible connecting bus bridge is connected with the lower end busbar of the first isolation cabinet.
Specifically, because the material of first wiring lug and second wiring lug is soft, be convenient for first wiring lug and the female reliable connection of arranging of the lower extreme of second connection cubical switchboard, second wiring lug is connected with the female row of the lower extreme of first isolation cabinet, and does not receive the size restriction of first wiring lug and second wiring lug.
S103, removing the first interconnection switch cabinet and installing a new first interconnection switch cabinet.
And S104, connecting the new first interconnection switch cabinet with the second isolation cabinet through the flexible interconnection bus bar bridge.
And S105, detaching the second contact switch cabinet and installing a new second contact switch cabinet.
Exemplarily, fig. 11 is a main wiring diagram of a 35kV power supply system provided by the embodiment of the present invention. Fig. 12 is a layout diagram of a 35kV switch cabinet provided by the embodiment of the invention. On the basis of the above embodiment, with reference to fig. 2, 11, and 12, the main content of this embodiment is to reform a first interconnection switch cabinet and a second interconnection switch cabinet of a regional substation, including a 35kV interconnection switch cabinet, by two stages:
the first stage is as follows: demolish the old 35kV of regional transformer substation and contact cubical switchboard II M, demolish and install new contact cubical switchboard II M after accomplishing, lay and install 35kV contact cubical switchboard II M300-12 to the interim cable of contact isolation cabinet I M3001, start the power transmission to the new 35kV contact cubical switchboard II M of installing after accomplishing.
The method comprises the following specific steps:
step 1, construction preparation.
And 2, removing the old 35kV contact switch cabinet IIM, the outgoing cable and the contact bus bridge.
Whether field equipment is in a maintenance state needs to be checked when a 35kV interconnection switch cabinet II M and an interconnection bus bar bridge are dismantled, a field isolation cabinet 3001, a bus coupler 30012, a Boshan station 4F10, a #2 power distribution transformer 302, a II bus power meter II M PT, a blast furnace station 3G2 and a #4 power generation transformer group 304 and a switch cabinet are checked to be in a maintenance state, and lines of the #2 power distribution transformer, the #4 main transformer and the Boshan station and the blast furnace station are in a power failure state.
And 3, installing a new 35kV interconnection switch cabinet II M.
And 4, completing a new II M test of the 35kV interconnection switch cabinet.
And 5, restoring and installing a new outlet cable of the 35kV interconnection switch cabinet IIM.
And 6, manufacturing a flexible connecting bus bridge.
Specifically, materials such as 35kV single-core cables and cable accessories with enough length are prepared according to the distance between an old interconnection switch cabinet and a new interconnection switch cabinet of a field high-voltage chamber.
In order not to influence the operation of the handcart, the flexible connecting bus bridge is hung on the roof of the high-pressure chamber, a transition bus bridge suspension arm is manufactured at a proper position of the high-pressure chamber, and the flexible connecting bus bridge is pulled up through the transition bus bridge suspension arm.
Illustratively, according to the cross-sectional flow of the bus bar bridge and the interconnection switch cabinet of the original interconnection switch cabinet being 1600A, the load current when the two bus bars are operated in a row is 800A, therefore, a 3001 bus-coupled isolation cabinet and a 30012 bus-coupled interconnection switch cabinet are connected by a 35kV single-core cable by 1 x 500mm2As a temporary bus bridge for switching operation, the cutoff amount is 1000A, and the requirement during switching operation can be met.
And 7, installing a new 35kV interconnection switch cabinet IIM to the flexible interconnection bus bridge.
The flexible connecting bus bridge installation method comprises the following steps: the cable can adopt flexible cable, and the upper end cover after the cabinet 3001 is kept apart from old contact to the first end of flexible cable down stretches into at the bottom of the cabinet, installs on female arranging of lower extreme, and the upper end cover after the switch cabinet 30012 is kept apart from new contact to the second end of flexible cable down stretches into at the bottom of the cabinet, installs on female arranging of lower extreme.
And 8, completing switching operation.
All loads with 35kV contact cubical switchboard IM pass through flexible contact generating line bridge switching operation, shift to 35kV contact cubical switchboard II M, withdraw from the operation of 35kV contact cubical switchboard IM.
And a second stage: demolish old 35kV of regional transformer substation and contact cubical switchboard I M, flexible contact generating line bridge, install new contact cubical switchboard I M, install new 35kV and contact cubical switchboard I M and new 35kV and contact cubical switchboard II M's generating line bridge, start the power transmission to new installation 35kV and contact cubical switchboard I M after the completion.
The method comprises the following specific steps:
step one, construction preparation.
And step two, removing the old 35kV interconnection switch cabinet I M, the outgoing cable and the flexible interconnection bus bridge.
When a 35kV interconnection switch cabinet IM is dismantled, 35kV 3001, 30012, 4F4, 301, IM PT, 3G1 and 303 and the switch cabinet are required to be in a maintenance state, and lines of a #1 power distribution transformer, a #3 main transformer and a Boshan station and a blast furnace station are in a power failure state.
And step three, installing a new 35kV interconnection switch cabinet IM.
And step four, completing the test of the newly installed 35kV interconnection switch cabinet IM.
And step five, restoring and installing a new outlet cable of the 35kV interconnection switch cabinet I M.
And sixthly, installing a new flexible interconnection bus bridge from the 35kV interconnection switch cabinet I M to the interconnection switch cabinet II M.
And step seven, installing a new bus-bar bridge.
For example, a 3001 isolated cabinet of a 35kV 1M buscouple to a bus-bar bridge of a 30012 switchgear of a 35kV 2M buscouple. The positions of all sections of the bus-bar bridge need to be checked before installation, rework caused by installation errors is prevented, and all sections of the bus-bar bridge are transported into a high-voltage cabinet; after the copper bus is installed, checking whether the phase sequence of the 35kV first bus 1M and the phase sequence of the 35kV second bus 2M are correct or not; and cleaning dust in the bus-bar bridge of the bus-bar connector, and sealing plates after cleaning.
All work of reforming old cubical switchboard into new cubical switchboard is accomplished, and the switching operation that does not have a power failure during the transformation has been realized, avoids influencing normal production.
The method adopting the flexible connecting bus bridge as the temporary transition bus bridge has large allowable error: the position errors of the bus coupler of the old cabinet and the new switch cabinet and the bus coupler isolation cabinet do not need to be considered, and larger position deviation is allowed to occur. And (3) reducing the power supply risk: the flexible connection cable heads on two sides can be manufactured in advance, relevant test work is well done, and the flexible connection cable head has the condition of being capable of being installed at any time. Therefore, the time for connecting the two sections of bus equipment is shortest, and the risk that no bus tie equipment is used for switching operation of a new switch and an old switch cabinet is reduced. The manufacturing is simple: the flexible connection is simple to manufacture and flexible and convenient to install. The material is easy to obtain: flexible coupling materials are readily available. The material can be repeatedly used: after the flexible connection is used and removed, the flexible connection can be used in other occasions.
It should be understood that various forms of the flows shown above may be used, with steps reordered, added, or deleted. For example, the steps described in the present invention may be executed in parallel, sequentially, or in different orders, and are not limited herein as long as the desired results of the technical solution of the present invention can be achieved.
The above-described embodiments should not be construed as limiting the scope of the invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A flexible interconnection bus bridge, comprising:
the cable terminal comprises a cable, a first cable terminal head accessory, a second cable terminal head accessory, a first wiring lug and a second wiring lug;
a first end of the cable is connected with the first cable termination accessory, and a second end of the cable is connected with the second cable termination accessory;
the first wiring lug is connected with the first cable terminal accessory, and the second wiring lug is connected with the second cable terminal accessory;
the first wiring lug and the second wiring lug are respectively connected with a busbar of the isolation cabinet or the switch cabinet.
2. The flexible communication bus bridge of claim 1, further comprising: a suspension arm of a transition bus bridge is arranged,
the transition bus bridge suspension arm is fixed on the roof of the space where the switch cabinet and/or the isolation cabinet are/is located; the cable is fixed to the roof through the transition bus bridge boom.
3. The switch cabinet transition connection method is characterized by being applied to a distribution line, wherein the distribution line comprises a first bus and a second bus, and the first bus is provided with a first switch device, a first interconnection switch cabinet and a first isolation cabinet; the second bus is provided with second switch equipment, a second connection switch cabinet and a second isolation cabinet;
the first end of the first switch device is connected with a first power supply, the second end of the first switch device is connected with a first load, the second end of the first switch device is connected with the first end of the first isolation cabinet, the second end of the first isolation cabinet is connected with the first end of the first interconnection switch, and the second end of the first interconnection switch is connected with the second end of the second interconnection switch;
the first end of the second switch device is connected with a second power supply, the second end of the second switch device is connected with a second load, the second end of the second switch device is connected with the first end of the second isolation cabinet, and the second end of the second isolation cabinet is connected with the first end of the second contact switch;
the switch cabinet transition connection method comprises the following steps:
manufacturing a flexible connecting bus bridge; the flexible communication bus bridge comprises a cable, a first cable terminal accessory, a second cable terminal accessory, a first wiring lug and a second wiring lug; a first end of the cable is connected with the first cable termination head accessory, and a second end of the cable is connected with the second cable termination head accessory; the first wiring lug is connected with the first cable terminal accessory, and the second wiring lug is connected with the second cable terminal accessory;
connecting the second tie switch cabinet to the first isolation cabinet through the flexible tie bus bridge;
dismantling the first interconnection switch cabinet and installing a new first interconnection switch cabinet;
connecting the new first interconnection switch cabinet with the second isolation cabinet through the flexible interconnection bus bar bridge;
and (4) dismantling the second contact switch cabinet and installing a new second contact switch cabinet.
4. The method of claim 3, further comprising, after said removing the second switchgear cabinet and installing a new second switchgear cabinet:
and installing a new bus connection bus bridge between the new second connection switch cabinet and the new first connection switch cabinet, and withdrawing the flexible connection bus bridge from operation.
5. The method of claim 3, wherein removing the first tie switchgear and installing a new first tie switchgear comprises:
dismantling a first interconnection switch cabinet and an outlet cable of the first interconnection switch cabinet, and installing a new first interconnection switch cabinet;
and restoring to install the outlet cable of the new first interconnection switch cabinet.
6. The method of claim 3, wherein said removing a second switchgear cabinet and installing a new second switchgear cabinet comprises:
removing outlet cables of a second contact switch cabinet and the second contact switch cabinet, and installing a new second contact switch cabinet; and restoring to install the outlet cable of the new second connection switch cabinet.
7. The method of claim 3, wherein said connecting said new first tie switchgear to said second insulated switchgear through said flexible tie bus bridge comprises:
extending the first end of the flexible interconnection bus-bar bridge downwards into the cabinet bottom from the upper end cover behind the first interconnection switch cabinet, and mounting the first end on the lower end busbar of the first interconnection switch cabinet; the second end of the flexible connecting bus bar bridge extends downwards into the bottom of the cabinet from the upper end cover behind the second isolation cabinet and is installed on the lower end bus bar;
and transferring a second load connected with the second interconnection switch cabinet to the first interconnection switch cabinet through the flexible interconnection bus bar bridge, and withdrawing the second interconnection switch cabinet from operation.
8. The method of claim 3, wherein said connecting said second tie cabinet to said first isolation cabinet via said flexible tie bus bridge comprises:
extending the first end of the flexible connecting bus bridge downwards into the cabinet bottom from the upper end cover behind the second connecting switch cabinet, and mounting the first end on a lower end bus bar of the second connecting switch cabinet; the second end of the flexible connecting bus bar bridge extends downwards into the bottom of the cabinet from the upper end cover behind the first isolation cabinet and is arranged on the lower end bus bar;
and transferring the first load connected with the first interconnection switch cabinet to the second interconnection switch cabinet through the flexible interconnection bus bar bridge, and withdrawing the first interconnection switch cabinet from operation.
9. The method of claim 3, wherein said connecting said new first tie switchgear to said second insulated switchgear through said flexible tie bus bridge comprises:
the first wiring lug of the flexible interconnection bus bar bridge is connected with a lower end busbar of the first interconnection switch cabinet;
and the second wiring lug of the flexible connecting bus bridge is connected with the lower end busbar of the second isolation cabinet.
10. The method of claim 3, wherein said connecting said second tie cabinet to said first isolation cabinet via said flexible tie bus bridge comprises:
the first wiring lug of the flexible interconnection bus bar bridge is connected with a lower end bus bar of the second interconnection switch cabinet;
and the second wiring lug of the flexible connecting bus bridge is connected with the lower end busbar of the first isolation cabinet.
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| CN114498313B (en) | 2023-02-03 |
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