CN113471863B - Uninterrupted power supply maintenance method for direct current screen of transformer substation - Google Patents
Uninterrupted power supply maintenance method for direct current screen of transformer substation Download PDFInfo
- Publication number
- CN113471863B CN113471863B CN202010245262.XA CN202010245262A CN113471863B CN 113471863 B CN113471863 B CN 113471863B CN 202010245262 A CN202010245262 A CN 202010245262A CN 113471863 B CN113471863 B CN 113471863B
- Authority
- CN
- China
- Prior art keywords
- cable
- temporary
- direct current
- current screen
- cables
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000012423 maintenance Methods 0.000 title claims abstract description 10
- 238000011065 in-situ storage Methods 0.000 claims description 5
- 238000012544 monitoring process Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
Classifications
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The disclosure provides a method for uninterrupted power supply maintenance of a direct-current screen of a transformer substation, and belongs to the technical field of power engineering. The method comprises the following steps: providing a temporary power supply direct current screen, wherein the structure of the temporary power supply direct current screen is the same as that of the direct current screen to be overhauled; providing a temporary cable group, wherein the temporary cable group comprises a plurality of temporary cables and a plurality of temporary cable switches respectively arranged on the temporary cables; connecting each terminal on the temporary power supply direct current screen with a load opposite terminal of each load by adopting a plurality of temporary cables; sequentially closing the plurality of temporary cable switches, and sequentially opening each cable switch in the original cable group, so that the temporary power supply direct current screen supplies power to each load through the plurality of temporary cables; dismantling the direct current screen to be overhauled, and overhauling the direct current screen to be overhauled. The method can realize the overhaul of the direct current screen under the condition of no power failure, ensure the reliable operation of each device in the transformer substation and reduce the economic loss caused by power failure.
Description
Technical Field
The disclosure relates to the technical field of power engineering, in particular to a method for uninterrupted power supply maintenance of a direct current screen of a transformer substation.
Background
The power operation power supply in the transformer substation is a direct current power supply nowadays, and the direct current screen is used for supplying the direct current power supply, and provides power for controlling loads, power loads, direct current accident lighting loads and the like, so that the direct current power supply is the basis for controlling and protecting the contemporary power system.
For the transformer substation direct current screen with longer running time, after the charging module and related components reach the service life limit, the transformer substation direct current screen is easy to damage and extremely high in fault rate, and the reliable running of devices such as monitoring, monitoring and relay protection of the transformer substation can be influenced, so that the power supply reliability of the transformer substation is directly influenced. Therefore, the direct current screen needs to be overhauled and replaced.
However, in the process of overhauling and replacing the direct current screen, the power-off of the total station secondary equipment is required to be applied, so that the reliable operation of devices such as monitoring, monitoring and relay protection of a transformer substation can be influenced, primary equipment corresponding to the secondary equipment can be further caused to be forced to stop, and economic loss is caused.
Disclosure of Invention
The embodiment of the disclosure provides a method for uninterrupted power supply overhaul of a direct current screen of a transformer substation, which can realize overhaul of the direct current screen under the condition of uninterrupted power supply, ensure reliable operation of devices in the transformer substation and reduce economic loss caused by power supply. The technical scheme is as follows:
The embodiment of the disclosure provides a method for uninterrupted power supply overhaul of a direct current screen of a transformer substation, which comprises the following steps:
providing a temporary power supply direct current screen, wherein the structure of the temporary power supply direct current screen is the same as that of the direct current screen to be overhauled;
Providing a temporary cable group, wherein the temporary cable group comprises a plurality of temporary cables and a plurality of temporary cable switches respectively arranged on the temporary cables;
Connecting each terminal on the temporary power supply direct current screen with a load opposite terminal of each load by adopting the temporary cables;
sequentially closing the plurality of temporary cable switches, and sequentially opening each cable switch in the original cable group, so that the temporary power supply direct current screen supplies power to each load through the plurality of temporary cables;
and dismantling the direct current screen to be overhauled, and overhauling the direct current screen to be overhauled.
Optionally, the providing a temporary cable set includes:
recording the total number of cables in the original cable group, the cable types of each cable and the capacity of a cable switch on each cable in an operation mode that all loads supplied by the direct current screen to be overhauled are not powered off;
And setting the temporary cable group equal to the total number of the cables in the original cable group according to the total number of the cables in the original cable group, the cable types of the cables and the capacities of the cable switches on the cables, wherein the cable types of the temporary cables in the temporary cable group and the capacities of the temporary cable switches on the temporary cables are the same as the original cable group.
Optionally, the cable type includes a control cable and a closing cable, the operating voltage of the control cable is 220V, and the operating voltage of the closing cable is 240V.
Optionally, the connecting each terminal on the temporary power supply dc screen with a load opposite terminal of each load by using the temporary cables includes:
recording the position of each load;
Determining the wiring position of each cable in the original cable group, wherein the wiring position of the cable comprises the terminal position of a terminal on the direct current screen to be overhauled, which is connected with one end of the cable, and the terminal position of a load opposite terminal of the load, which is connected with the other end of the cable;
And according to the position of each load and the wiring position of each cable in the original cable set, connecting each terminal on the temporary power supply direct current screen with a load opposite terminal of each load by adopting the temporary cables.
Optionally, the sequentially closing the plurality of temporary cable switches and sequentially opening each cable switch in the original cable set, so that the temporary power supply dc screen supplies power to each load through the plurality of temporary cables, including:
Sequentially closing a plurality of temporary cable switches one by one, and after closing one temporary cable switch at a time, opening the cable switch on one cable corresponding to the temporary cable in the original cable group until all the temporary cable switches in the temporary cable group are closed and all the cable switches in the original cable group are opened;
the cable corresponding to the temporary cable in the original cable is the cable with the same wiring position as the temporary cable.
Optionally, the closing the temporary cable switches sequentially includes:
And after sequentially closing the temporary cable switches on the temporary cables connected with the same load, sequentially closing the temporary cable switches on the temporary cables connected with the next load.
Optionally, the method further comprises:
after each terminal on the temporary power supply direct current screen is connected with a load opposite terminal of each load by adopting the plurality of temporary cables, before the plurality of temporary cable switches are sequentially closed, whether the pressure difference between the input end and the output end of each temporary cable switch meets the inspection requirement is measured.
Optionally, the measuring whether the differential pressure between the input end and the output end of each temporary cable switch meets the checking requirement includes:
and measuring whether the voltage difference between the input end and the output end of the switch on each temporary cable is lower than 5V.
Optionally, the method further comprises:
installing a new direct current screen in situ of the direct current screen to be overhauled;
connecting the new direct current screen with each load by adopting each cable in the original cable set;
and sequentially closing the cable switches in the original cable group, and sequentially opening the temporary cable switches in the temporary cable group, so that the new direct current screen supplies power to the loads through the original cable group.
Optionally, the method further comprises:
and removing the temporary power supply direct current screen and the temporary cable group.
The technical scheme provided by the embodiment of the disclosure has the beneficial effects that at least:
A temporary cable set is provided to replace the original cable set by providing a temporary power supply direct current screen to replace the direct current screen to be overhauled. And connecting each terminal on the temporary power supply direct current screen with a load opposite terminal of each load by adopting a plurality of temporary cables in the temporary cable group so as to realize the connection between the temporary direct current screen and each load. Then sequentially closing a plurality of temporary cable switches in the temporary power supply cable group, connecting the temporary power supply direct current screen with the power supply of the direct current screen to be overhauled in parallel, enabling the temporary power supply direct current screen and the direct current screen to be overhauled to supply power to loads simultaneously, sequentially disconnecting each cable switch in the original cable group, enabling the temporary power supply direct current screen to supply power to each load through a plurality of temporary cables, and replacing the direct current screen to be overhauled. At the moment, the direct current screen to be overhauled does not supply power to the load, the direct current screen to be overhauled can be dismantled, the overhauling of the direct current screen is realized under the condition of no power failure, the reliable operation of each device in a transformer substation is ensured, and the economic loss caused by power failure is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and other drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.
Fig. 1 is a flowchart of a method for uninterrupted power supply maintenance of a direct current screen of a transformer substation provided by an embodiment of the disclosure;
Fig. 2 is a flowchart of a method for uninterrupted power supply maintenance of a dc screen of a transformer substation according to an embodiment of the present disclosure;
fig. 3 is a schematic diagram of overhauling a dc screen of a substation according to an embodiment of the present disclosure;
fig. 4 is a schematic connection diagram of a temporary power supply dc screen according to an embodiment of the present disclosure.
Detailed Description
For the purposes of clarity, technical solutions and advantages of the present disclosure, the following further details the embodiments of the present disclosure with reference to the accompanying drawings.
Fig. 1 is a flowchart of a method for uninterrupted power supply maintenance of a dc screen of a transformer substation according to an embodiment of the present disclosure, as shown in fig. 1, the method includes:
step 101, a temporary power supply direct current screen is provided.
The structure of the temporary power supply direct current screen is equal to that of the direct current screen to be overhauled.
The temporary power supply dc screen is, for example, identical to the dc screen to be serviced in terms of the position and number of terminals and the magnitude of the output current. For example, the power supply dc screen and the dc screen to be overhauled may be the same type dc screen.
The DC screen is a novel DC system for digital control, protection, management and measurement.
Step 102, providing a temporary cable set.
The structure of the temporary power supply direct current screen can be equal to that of the direct current screen to be overhauled.
And 103, connecting each terminal on the temporary power supply direct current screen with a load opposite terminal of each load by adopting a plurality of temporary cables.
In this embodiment, the load may be a secondary device in the substation, where the secondary device includes a device for monitoring, relay protection, and so on. The secondary equipment can control and protect primary equipment in the transformer substation.
And 104, sequentially closing the plurality of temporary cable switches, and sequentially opening each cable switch in the original cable group, so that the temporary power supply direct current screen supplies power to each load through the plurality of temporary cables.
And 105, dismantling the direct current screen to be overhauled, and overhauling the direct current screen to be overhauled.
The embodiment of the disclosure provides a temporary cable group to replace the original cable group by providing a temporary power supply direct current screen to replace the direct current screen to be overhauled. And connecting each terminal on the temporary power supply direct current screen with a load opposite terminal of each load by adopting a plurality of temporary cables in the temporary cable group so as to realize the connection between the temporary direct current screen and each load. Then sequentially closing a plurality of temporary cable switches in the temporary power supply cable group, connecting the temporary power supply direct current screen with the power supply of the direct current screen to be overhauled in parallel, enabling the temporary power supply direct current screen and the direct current screen to be overhauled to supply power to loads simultaneously, sequentially disconnecting each cable switch in the original cable group, enabling the temporary power supply direct current screen to supply power to each load through a plurality of temporary cables, and replacing the direct current screen to be overhauled. At the moment, the direct current screen to be overhauled does not supply power to the load, the direct current screen to be overhauled can be dismantled, the overhauling of the direct current screen is realized under the condition of no power failure, the reliable operation of each device in a transformer substation is ensured, and the economic loss caused by power failure is reduced.
Fig. 2 is a flowchart of another method for uninterrupted power supply maintenance of a dc screen of a transformer substation according to an embodiment of the present disclosure, as shown in fig. 2, where the method includes:
step 201, a temporary power supply dc screen is provided.
The structure of the temporary power supply direct current screen is equal to that of the direct current screen to be overhauled.
The power supply dc screen is, for example, identical to the terminals and the number of terminals on the dc screen to be serviced, as well as the magnitude of the output current. For example, the power supply dc screen and the dc screen to be overhauled may be the same type dc screen.
In this embodiment, the temporary power supply dc screen may be disposed around the dc screen to be overhauled, that is, the distance is smaller than the set value.
Step 202, providing a temporary cable set.
The structure of the temporary power supply direct current screen is equal to that of the direct current screen to be overhauled.
Illustratively, step 202 may include:
The first step is to record the total number of cables in the original cable set, the cable types of each cable and the capacity of the cable switch on each cable in the operation mode that all loads supplied by the direct current screen to be overhauled are not powered off.
The original cable set is used for connecting each terminal on the direct current screen to be overhauled with a load opposite terminal of each load, and the cable type comprises a control cable and a closing cable.
Optionally, the cable type includes a control cable and a closing cable, the working voltage of the control cable is 220V, and the working voltage of the closing cable is 240V.
For example, the cable switch located on the control cable may be referred to as a control switch, the switch located on the closing cable may be a closing switch, and the control switch and the closing switch are both air switches.
An air switch, also known as an air circuit breaker, is one type of circuit breaker. The air switch is a switch integrating control and multiple protection functions, and can be automatically opened as long as the current in the circuit exceeds the rated current. Besides the functions of contacting and breaking the circuit, the air switch can also protect short circuit, serious overload, undervoltage and the like of the circuit or the electrical equipment.
And a second step of setting a temporary cable group equal to the total number of the cables in the original cable group according to the total number of the cables in the original cable group, the cable types of the cables and the capacities of the cable switches on the cables.
Wherein the cable type of each temporary cable in the temporary cable group and the capacity of the temporary cable switch on each temporary cable are the same as the original cable group.
Through the arrangement mode, after the direct current screen to be overhauled is dismantled, the temporary cable group can completely replace the original cable group, so that the temporary direct current screen can supply power for each load through the temporary cable group.
And 203, connecting each terminal on the temporary power supply direct current screen with a load opposite terminal of each load by adopting a plurality of temporary cables.
Illustratively, step 203 may include:
and a first step of recording the positions of the loads.
In this embodiment, the location of each load is the physical location of each load. For example, the load may include a 35KV load, a10 KV load, etc., where the 35KV load is located in one room and the 10KV load is located in another room. At this time, the room number of each load connected with the direct current screen to be overhauled can be recorded.
In an implementation manner of this embodiment, the numbers of the loads may be recorded, and the positions of the loads corresponding to the numbers may be obtained according to a cable laying table, where the cable laying table may be obtained from a construction drawing when building a station.
And secondly, determining the wiring position of each cable in the original cable group, wherein the wiring position of the cable comprises the terminal position of a terminal on the direct current screen to be overhauled, which is connected with one end of the cable, and the terminal position of a load opposite terminal of a load, which is connected with the other end of the cable.
Illustratively, each cable has a number, and the connection positions of the two ends of each cable can be obtained by looking up the cable laying table according to the number of each cable.
And thirdly, connecting each terminal on the temporary power supply direct current screen with a load opposite terminal of each load by adopting a plurality of temporary cables according to the position of each load and the wiring position of each cable in the original cable group.
Fig. 3 is an overhaul schematic diagram of a dc screen of a transformer substation provided in an embodiment of the present disclosure, as shown in fig. 3, a dc screen 1 to be overhauled is connected to a load opposite terminal 2 through an original cable set 4, and a temporary power supply dc screen 3 is connected to the load opposite terminal 2 through a temporary cable set 5. At this time, the direct current screen 1 to be overhauled and the temporary power supply direct current screen 3 can both supply power for loads.
Fig. 4 is a schematic connection diagram of a temporary power supply dc screen according to an embodiment of the present disclosure, as shown in fig. 4, in this embodiment, the load includes a 35KV load and a 10KV load.
The temporary power supply direct current screen 3 is connected with the 35KV load cabinet terminal 1 of the corresponding 35KV load through the first temporary cable S11 and the second temporary cable S12.
The temporary power supply direct current screen 3 is connected with the 10KV load cabinet terminal 1 of the corresponding 10KV load through a third temporary cable S21 and a fourth temporary cable S22.
The temporary power supply dc screen 3 is connected to other terminals through other cables.
The first temporary cable S11 and the third temporary cable S21 are all closing cables, and closing switches are arranged on the first temporary cable S11 and the third temporary cable S21. The second temporary cable S12 and the fourth temporary cable S22 are control cables, and control switches are arranged on the control cables.
Step 204, measuring whether the differential pressure between the input end and the output end of each temporary cable switch meets the checking requirement.
Optionally, step 204 may include:
it is measured whether the voltage difference between the input and output of the switch on each temporary cable is below 5V.
When the pressure difference is lower than 5V, the size of the generated circulating current can not exceed 5A after the subsequent temporary power supply direct current screen is connected with the power supply of the direct current screen to be overhauled in parallel, so that the load can be smoothly converted after the temporary power supply direct current screen is connected with the power supply of the direct current screen to be overhauled in parallel, and larger impact can not be generated.
Optionally, after performing step 204, before performing step 205, the method may further include:
And electrifying and debugging the temporary direct current screen to ensure that the temporary direct current screen works normally after operation.
And 205, sequentially closing the plurality of temporary cable switches, and sequentially opening each cable switch in the original cable group, so that the temporary power supply direct current screen supplies power to each load through the plurality of temporary cables.
Illustratively, step 205 may include:
and sequentially closing the temporary cable switches one by one, and after closing one temporary cable switch each time, disconnecting the cable switch on one cable corresponding to the temporary cable in the original cable group until the temporary cable switches in the temporary cable group are all closed, and disconnecting the cable switches in the original cable group. The cables corresponding to the temporary cables in the original cables are cables with the same wiring positions as the temporary cables.
When the temporary cable switch is closed, the cable in which the temporary cable switch is positioned and the cable switch on the cable in the corresponding original cable group are closed, and the temporary direct current screen and the direct current screen to be overhauled can supply power for the load at the same time. And then the cable switch in the corresponding original cable group is disconnected, and at the moment, the temporary direct current screen supplies power for the load.
In one implementation manner of this embodiment, after the temporary cable switches on the temporary cables connected to the same load are sequentially closed, the temporary cable switches on the temporary cables connected to the next load may be sequentially closed. The switches are closed in turn according to the connections to the respective loads.
In another implementation manner of this embodiment, the temporary cable switches on the temporary cables may be sequentially closed according to the connection positions of the temporary cables on the temporary dc screen from top to bottom and from left to right.
In still another implementation manner of this embodiment, the temporary cable switches on the temporary cables corresponding to the numbering sequence of the original cables in the temporary cable group may be sequentially closed according to the numbering sequence of the original cables in the original cable group.
And 206, dismantling the direct current screen to be overhauled, and overhauling the direct current screen to be overhauled.
Wherein, only one end of each cable in the original cable group is separated from each output terminal of the direct current screen to be overhauled, and the connection between the other end of each cable in the original cable group and the load opposite terminal of each load is reserved. So as to facilitate the subsequent installation of a new dc screen.
Step 207, installing a new direct current screen in situ of the direct current screen to be overhauled.
For example, the new dc screen may be placed in the room where the dc screen is to be serviced, enabling in-situ installation.
Through the new direct current screen of in-situ installation at waiting to overhaul the direct current screen, can adopt former cable group to be connected new direct current screen with the load, reduce the laying again of cable group, improve the maintenance, the change efficiency of transformer substation direct current screen.
Step 208, connecting the new dc screen with each load by using each cable in the original cable set.
One end of each cable in the original cable group can be connected with each terminal on the new direct current screen according to the wiring position of each cable in the original cable group.
Illustratively, each cable has a number, and the connection positions of the two ends of each cable can be obtained by looking up the cable laying table according to the number of each cable.
And 209, sequentially closing all cable switches in the original cable group, and sequentially opening all the temporary cable switches in the temporary cable group, so that the new direct current screen supplies power to all loads through the original cable group.
Illustratively, step 209 may include:
and closing each cable switch in the original cable group one by one in sequence, and after closing one cable switch each time, opening the temporary cable switch on one temporary cable corresponding to the original cable in the temporary cable group until each cable switch in the original cable group is closed and each temporary cable switch in the temporary cable group is opened. One temporary cable corresponding to the original cable in the temporary cable group is a cable with the same wiring position as the original cable.
When the cable switch in the original cable group is closed, the original cable where the original cable switch is located and the temporary cable switch on the temporary cable in the corresponding temporary cable group are both closed, and the temporary direct current screen and the direct current screen to be overhauled can supply power for the load at the same time. And then the temporary cable switch in the corresponding temporary cable is disconnected, and at the moment, the new direct current screen supplies power for the load.
In one implementation manner of this embodiment, after the original cable switches on the original cables connected to the same load are sequentially closed, the original cable switches on the original cables connected to the next load are sequentially closed. The switches are closed in turn according to the connections to the respective loads.
In another implementation manner of this embodiment, the original cable switches on the original cables may be sequentially closed according to the connection positions of the original cables on the new dc screen from top to bottom and from left to right.
In another implementation manner of this embodiment, the original cable switches on the original cables may be sequentially closed according to the serial numbers of the original cables in the original cable group.
And 210, removing the temporary power supply direct current screen and the temporary cable group.
Wherein the other end of the temporary cable group can be detached from the load opposite terminal of the load.
The embodiment of the disclosure provides a temporary cable group to replace the original cable group by providing a temporary power supply direct current screen to replace the direct current screen to be overhauled. And connecting each terminal on the temporary power supply direct current screen with a load opposite terminal of each load by adopting a plurality of temporary cables in the temporary cable group so as to realize the connection between the temporary direct current screen and each load. Then sequentially closing a plurality of temporary cable switches in the temporary power supply cable group, connecting the temporary power supply direct current screen with the power supply of the direct current screen to be overhauled in parallel, enabling the temporary power supply direct current screen and the direct current screen to be overhauled to supply power to loads simultaneously, sequentially disconnecting each cable switch in the original cable group, enabling the temporary power supply direct current screen to supply power to each load through a plurality of temporary cables, and replacing the direct current screen to be overhauled. At the moment, the direct current screen to be overhauled does not supply power to the load, the direct current screen to be overhauled can be dismantled, the overhauling of the direct current screen is realized under the condition of no power failure, the reliable operation of each device in a transformer substation is ensured, and the economic loss caused by power failure is reduced.
The foregoing description of the preferred embodiments of the present disclosure is provided for the purpose of illustration only, and is not intended to limit the disclosure to the particular embodiments disclosed, but on the contrary, the intention is to cover all modifications, equivalents, alternatives, and alternatives falling within the spirit and principles of the disclosure.
Claims (2)
1. A method for uninterrupted power supply maintenance of a direct current screen of a transformer substation, the method comprising:
providing a temporary power supply direct current screen, wherein the structure of the temporary power supply direct current screen is the same as that of the direct current screen to be overhauled, and the structure comprises terminal positions and terminal quantity;
Under the operation mode that all loads supplied by the direct current screen to be overhauled are not powered off, recording the total number of cables in the original cable set, the cable type of each cable and the capacity of a cable switch on each cable;
Setting a temporary cable group equal to the total number of cables in the original cable group according to the total number of cables in the original cable group, the cable types of the cables and the capacity of cable switches on the cables, wherein the cable types of the temporary cables in the temporary cable group and the capacity of the temporary cable switches on the temporary cables are the same as those of the original cable group, the cable types comprise a control cable and a closing cable, the cable switches on the control cable are control switches, the switches on the closing cable are closing switches, the working voltage of the control cable is 220V, and the working voltage of the closing cable is 240V;
recording the position of each load, wherein the loads comprise 35KV loads and 10KV loads;
Determining the wiring position of each cable in the original cable group, wherein the wiring position of the cable comprises the terminal position of a terminal on the direct current screen to be overhauled, which is connected with one end of the cable, and the terminal position of a load opposite terminal of the load, which is connected with the other end of the cable;
According to the position of each load and the wiring position of each cable in the original cable set, connecting each terminal on the temporary power supply direct current screen with a load opposite terminal of each load by adopting the temporary cables;
measuring whether the pressure difference between the input end and the output end of each temporary cable switch is lower than 5V or not so as to ensure that the size of the generated circulating current is not more than 5A after the temporary power supply direct current screen is connected with the power supply of the direct current screen to be overhauled in parallel;
Sequentially closing a plurality of temporary cable switches one by one, and after closing one temporary cable switch at a time, opening the cable switch on one cable corresponding to the temporary cable in the original cable group until all the temporary cable switches in the temporary cable group are closed and all the cable switches in the original cable group are opened, wherein the cable corresponding to the temporary cable in the original cable is the cable with the same wiring position as the temporary cable;
dismantling the direct current screen to be overhauled, and overhauling the direct current screen to be overhauled;
installing a new direct current screen in situ of the direct current screen to be overhauled;
Connecting one end of each cable in the original cable set with each terminal on the new direct current screen according to the wiring position of each cable in the original cable set;
Sequentially closing all the cable switches in the original cable group, and sequentially opening all the temporary cable switches in the temporary cable group, so that the new direct current screen supplies power for all the loads through the original cable group;
The temporary cable switches are sequentially closed one by one, and the temporary cable switch comprises any one of the following implementation modes:
Sequentially closing the temporary cable switches on the temporary cables connected with the same load, and sequentially closing the temporary cable switches on the temporary cables connected with the next load;
According to the wiring positions of the temporary cables on the temporary direct current screen, sequentially closing the temporary cable switches on the temporary cables from top to bottom and from left to right;
And sequentially closing the temporary cable switches on the temporary cables corresponding to the serial numbers of the cables in the temporary cable group according to the serial numbers of the cables in the original cable group.
2. The method according to claim 1, wherein the method further comprises:
and removing the temporary power supply direct current screen and the temporary cable group.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010245262.XA CN113471863B (en) | 2020-03-31 | 2020-03-31 | Uninterrupted power supply maintenance method for direct current screen of transformer substation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010245262.XA CN113471863B (en) | 2020-03-31 | 2020-03-31 | Uninterrupted power supply maintenance method for direct current screen of transformer substation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113471863A CN113471863A (en) | 2021-10-01 |
| CN113471863B true CN113471863B (en) | 2024-06-25 |
Family
ID=77865580
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010245262.XA Active CN113471863B (en) | 2020-03-31 | 2020-03-31 | Uninterrupted power supply maintenance method for direct current screen of transformer substation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113471863B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2888718Y (en) * | 2006-03-29 | 2007-04-11 | 门宇华 | A non-stop DC operated power supply device for substation |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101841170B (en) * | 2008-12-25 | 2016-04-27 | 厦门蓝溪科技有限公司 | A kind of storage battery parallel power supply method |
| DE102009006504A1 (en) * | 2009-01-28 | 2010-07-29 | Lutz, Ferdinand, Dr. | Controller and single-phase transformer arrangement for alternating current system, has output windings switched over set of switches and bypassed over another set of switches, and controller for controlling actuation of sets of switches |
| CN102064598A (en) * | 2010-11-30 | 2011-05-18 | 山东电力集团公司威海供电公司 | Uninterrupted switching device for DC power supply in transformer substation |
| CN102437640A (en) * | 2011-11-28 | 2012-05-02 | 武汉供电公司变电检修中心 | Special movable maintenance power supply system for direct-current screen |
| CN205945206U (en) * | 2016-07-12 | 2017-02-08 | 瓮福（集团）有限责任公司 | Incessant direct current power supply unit |
| CN207601280U (en) * | 2017-11-27 | 2018-07-10 | 广州市扬新技术研究有限责任公司 | A kind of accumulator group state on-line measurement circuit |
| CN109950822B (en) * | 2019-03-29 | 2021-06-04 | 国网湖北省电力有限公司宜昌供电公司 | Uninterrupted replacing method for 110KV one-power one-charging direct-current system |
| CN110277779B (en) * | 2019-05-13 | 2020-09-11 | 国家电网有限公司 | Power supply device for temporarily replacing direct current screen |
-
2020
- 2020-03-31 CN CN202010245262.XA patent/CN113471863B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2888718Y (en) * | 2006-03-29 | 2007-04-11 | 门宇华 | A non-stop DC operated power supply device for substation |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113471863A (en) | 2021-10-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11318858B2 (en) | Intelligent electric-vehicle charging station | |
| CN102280864A (en) | Post-failure live treatment method for protection device of distribution network system and portable protection device | |
| CN109274182A (en) | The long-range integrated monitoring platform of DC power supply | |
| CN114172236A (en) | Automatic system for intelligent switching of storage batteries of transformer substation | |
| CN102074994B (en) | Charging device of direct-current (DC) system | |
| CN113471863B (en) | Uninterrupted power supply maintenance method for direct current screen of transformer substation | |
| CN113437795B (en) | Mobile box transformer substation vehicle with input voltage automatic switching function | |
| CN112216173B (en) | Alternating current-direct current power supply simulation system | |
| KR102332571B1 (en) | An electric power supply method of the control unit for pad mounted type switchgear for underground line | |
| US6420850B1 (en) | Telecommunication power distribution systems and apparatuses and methods of supplying power to a telecommunication device | |
| CN107240885B (en) | Method for searching fault with non-corresponding background display position of double-bus isolating switch | |
| CN216750949U (en) | Portable integrated form electric transformation system | |
| KR100532925B1 (en) | Detection techniques of line-to-earth fault section in ungrounded network base on distribution automation | |
| CN219554656U (en) | Maintenance power distribution optimizing equipment | |
| CN219739969U (en) | Power supply circuit of energy storage high-voltage box | |
| CN213813868U (en) | Circuit breaker control circuit fault point positioning device | |
| EP2972433B1 (en) | System for automation of measurement of backup-batteries capacity in a telecommunications power station | |
| CN216721001U (en) | Power supply system of auxiliary safety power supply of nuclear power station | |
| CN217427761U (en) | Automatic access system of standby charger | |
| CN219576692U (en) | Electric power system and emergency control power supply device thereof | |
| CN208971400U (en) | Compressor test variable-voltage power supply device | |
| CN221727947U (en) | 10KV generating set parallel operation system | |
| CN118336841A (en) | Building block fast assembly type direct current power supply overhauls interim screen | |
| CN207780583U (en) | A kind of soft straight starting device of multivoltage | |
| CN116683622A (en) | Fall insurance monitoring device and using method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |