CN112310874A - 220V double-charging four-feed direct current system uninterrupted safe replacement method - Google Patents
220V double-charging four-feed direct current system uninterrupted safe replacement method Download PDFInfo
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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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- 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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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Abstract
The safe replacement method without power outage for the 220V two-charging four-feed direct current system comprises power supply transfer, load transfer and sequential dismantling of a charging screen and a feeding screen, wherein the direct current power supply bus of the two-charging four-feed direct current system is arranged in the charging screen, the feeding screen and the charging screen are connected with the direct current bus through a circuit breaker, the operation process is uncharged, the load is always electrified through opening and closing of the circuit breaker, the charging screens and the feeding screen are sequentially and safely dismantled through the power supply transfer and the load transfer in the operation process, the structure of the direct current power supply system is not changed after the replacement is completed, the original power supply structure and operation setting are maintained, the safety of the whole process is remarkably improved, the construction period is remarkably shortened, the economic benefit is remarkably improved, and the safe replacement method is suitable for popularization and use in maintenance of a low-voltage direct current power supply system of a transformer.
Description
Technical Field
The invention relates to the field of transformer substation direct current system safety, in particular to a 220V double-charging four-feed direct current system uninterrupted safety replacement method.
Background
The low-voltage DC system is used in hydraulic power plant, thermal power plant, transformer substation and other users using DC equipment, and is used as power supply equipment for providing DC power supply for signal equipment, protection, automatic equipment, emergency power supply, breaker on-off and switch-on. The direct current system is an independent power supply, is not influenced by a generator, plant power and a system operation mode, and ensures that a backup power supply (a storage battery) continuously provides important equipment of the direct current power supply under the condition that external alternating current is interrupted.
The direct current system usually provides power for monitoring and action parts such as signal equipment, protection, automatic devices and the like, and the normal stable operation of the direct current system is important to the load of the power provided by the direct current system, so when the direct current system is designed, two direct current bus power supplies (charging screens) are usually adopted, the direct current bus power supplies are connected through a bus-tie switch (interconnection screen), one set of direct current bus power supply fails, the load can be connected with the other set of direct current bus by the bus-tie switch to realize continuous power supply, the power supply stability problem is well solved in the form, but the power facilities need to be regularly checked, maintained and maintained, because the direct current buses are continuously electrified, the maintenance risk of the corresponding charging screens and feeding screens is large, and therefore, the power failure is often required to be maintained, the loss of the load end of the power transformation system is large, and the traditional uninterrupted maintenance is realized, the charged screen and the feed screen are required to be detached for live-line operation, so that operators need to wear heavy protection, the whole process is very slow, the requirement on the skills of operators is high, and meanwhile certain safety risks also exist.
Chinese patent document CN 109995015a describes a 220KV two-power two-charging dc system, which uses two-in two-out incoming lines to effectively improve the reliability of the power supply, but the dc bus runs through the charging screen and the feeding screen, and when the replacement or maintenance operation is performed without shutdown, because the duration of the replacement is long, the dc bus of the detachable portion is exposed for a long time during the operation process, which becomes a dangerous potential safety hazard, and the replacement is performed in a live-line manner, which has a high technical requirement on the operator and a high operation risk.
Chinese patent document CN 109888765a describes a method for replacing a 220KV two-power-supply two-charging dc system without power cut, in which a new dc system can be installed in situ by replacing the two-power-supply two-charging dc system without power cut, and a bridge system, i.e., a temporary dc system, is omitted, so that the new system can be directly replaced. A large amount of manpower and material resources are saved, the power grid risk is reduced, and the power failure time is shortened. The change process is taken the liaison cabinet to taking the direct current system of liaison cabinet to change to old-fashioned, when later stage need be to new screen and the feed screen of charging maintain and maintain, and the operation when its dismantlement can not reach the operation position uncharged, and the risk is higher.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a 220V double-charging four-feed direct current system uninterrupted safe replacement method, on the premise that two sets of direct current power supplies are provided to ensure the reliability of power supply, the feed screen and the charging screen are conveniently and quickly connected and are disassembled without interruption, and the live operation is avoided through the power supply conversion between the charging screen and the feed screen and the opening and closing of the circuit breakers on the screens in the disassembly process, so that the maintenance efficiency is greatly improved, and meanwhile, the safety is also greatly improved.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
A220V double-charging four-feed direct current system uninterrupted safe replacement method comprises the following steps:
step 3, dismantling the original 1# direct current system feed screen 2, installing a new 1# direct current system feed screen 1, and transferring the load on the original 1# direct current system feed screen 1 to the new 1# direct current system feed screen 1;
step 4, dismantling the original 1# direct current system feed screen 1, installing a new 1# direct current system charging screen, performing power supply connection on the new 1# direct current system feed screen 1 and the feed screen 2 and the new 1# direct current system charging screen, and transferring power supply of the 2# direct current system feed screen 1 and the feed screen 2 to a new 2# direct current system;
step 5, dismantling the original 2# direct current system charging screen, installing a new 2# direct current system feeding screen 2, and transferring the load on the original 2# direct current system feeding screen 2 to the new 2# direct current system feeding screen 2;
step 6, dismantling the original 2# direct current system feed screen 2, installing a new 2# direct current system feed screen 1, and transferring the load on the original 2# direct current system feed screen 1 to the new 2# direct current system feed screen 1;
step 7, dismantling the original 2# direct current system feed screen 1, installing a new 2# direct current system charging screen, and transferring power supply of the new 2# direct current system feed screen 1 and the feed screen 2 to the new 2# direct current system charging screen;
a DC220V power supply direct current bus KM1+ and KM 1-and power supply circuit breakers 11K and 12K connected with the power supply direct current bus are arranged in the charging screen of the 1# direct current system;
two connecting circuit breakers 13K and 14K are arranged in the No. 1 direct current system feed screen 1, and two connecting circuit breakers 15K and 16K are arranged in the No. 1 direct current system feed screen 2;
the power supply breaker 11K is connected with the connecting breaker 15K, the power supply breaker 12K is connected with the connecting breaker 13K, and the 1# direct current system charging screen supplies power to the 1# direct current system feed screen 1 and the feed screen 2;
a DC220V power supply direct current bus KM2+ and KM 2-and power supply circuit breakers 21K and 22K connected with the power supply direct current bus are arranged in the 2# direct current system charging screen;
two connecting circuit breakers 23K and 24K are arranged in the No. 2 direct current system feed screen 1, and two connecting circuit breakers 25K and 26K are arranged in the No. 2 direct current system feed screen 2;
the power supply circuit breaker 21K is connected with the connecting circuit breaker 25K, the power supply circuit breaker 22K is connected with the connecting circuit breaker 23K, and the 2# direct current system charging screen supplies power for the 2# direct current system feeding screen 1 and the feeding screen 2.
The uninterrupted safe replacement method of the 220V double-charging four-feed direct current system has the following beneficial effects that:
1) the replacement period is shortened, the power supply circuit breaker of the charging screen of the direct current system and the connecting circuit breaker of the feed screen enable the power supply of the feed screen to be converted in the feed screens of other direct current systems and the feed screen of the system during replacement, and the power supply of the feed screen can be realized by connecting, disassembling and disconnecting the circuit breakers, the power supply process of the feed screen is uncharged through the circuit breakers, heavy insulation protection does not need to be worn, and the replacement efficiency is improved in reply;
2) the safety is improved, because the power supply direct current bus is arranged in the direct current charging screen, the direct current feed screen is connected with the bus through the power supply breaker, when the cabinet body is dismantled, the dismantled cabinet body does not have an exposed direct current bus any more, the safety is obviously improved, and then through the combination of the breakers, the conversion and the dismantling of power supply are realized, the charging screen and the feed screen can be safely dismantled in a power failure mode without influencing the power supply of a load, and the whole-process cable dismantling and laying operation is implemented under the power failure condition;
3) economic benefits are improved, the replacement period is shortened, requirements for personnel skills are reduced, obvious cost reduction is achieved, meanwhile, a temporary power supply system and a main power supply cable do not need to be arranged in the replacement method, and requirements for replacing consumables are also greatly reduced.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a flow chart of the safe replacement without power outage of the method of the present invention;
FIG. 2 is a schematic circuit diagram of a 220V dual-charging four-feed DC system according to the present invention;
FIG. 3 is a schematic diagram of a DC system feed panel circuit of the present invention;
FIG. 4 is a front view of an electrical cabinet of a two-charging four-feeding DC system according to the present invention;
fig. 5 is a schematic diagram of the back connection of the two-charging four-feeding dc system cabinet of the present invention.
Detailed Description
As shown in fig. 1 and 2, a 220V two-charging four-feeding dc system non-power-off safety replacement method includes the following steps:
step 3, dismantling the original 1# direct current system feed screen 2, installing a new 1# direct current system feed screen 1, and transferring the load on the original 1# direct current system feed screen 1 to the new 1# direct current system feed screen 1;
step 4, dismantling the original 1# direct current system feed screen 1, installing a new 1# direct current system charging screen, performing power supply connection on the new 1# direct current system feed screen 1 and the feed screen 2 and the new 1# direct current system charging screen, and transferring power supply of the 2# direct current system feed screen 1 and the feed screen 2 to a new 2# direct current system;
step 5, dismantling the original 2# direct current system charging screen, installing a new 2# direct current system feeding screen 2, and transferring the load on the original 2# direct current system feeding screen 2 to the new 2# direct current system feeding screen 2;
step 6, dismantling the original 2# direct current system feed screen 2, installing a new 2# direct current system feed screen 1, and transferring the load on the original 2# direct current system feed screen 1 to the new 2# direct current system feed screen 1;
step 7, dismantling the original 2# direct current system feed screen 1, installing a new 2# direct current system charging screen, and transferring power supply of the new 2# direct current system feed screen 1 and the feed screen 2 to the new 2# direct current system charging screen;
a DC220V power supply direct current bus KM1+ and KM 1-and power supply circuit breakers 11K and 12K connected with the power supply direct current bus are arranged in the charging screen of the 1# direct current system;
two connecting circuit breakers 13K and 14K are arranged in the No. 1 direct current system feed screen 1, and two connecting circuit breakers 15K and 16K are arranged in the No. 1 direct current system feed screen 2;
the power supply breaker 11K is connected with the connecting breaker 15K, the power supply breaker 12K is connected with the connecting breaker 13K, and the 1# direct current system charging screen supplies power to the 1# direct current system feed screen 1 and the feed screen 2;
a DC220V power supply direct current bus KM2+ and KM 2-and power supply circuit breakers 21K and 22K connected with the power supply direct current bus are arranged in the 2# direct current system charging screen;
two connecting circuit breakers 23K and 24K are arranged in the No. 2 direct current system feed screen 1, and two connecting circuit breakers 25K and 26K are arranged in the No. 2 direct current system feed screen 2;
the power supply breaker 21K is connected with the connecting breaker 25K, the power supply breaker 22K is connected with the connecting breaker 23K, and the 2# direct current system charging screen supplies power for the 2# direct current system feed screen 1 and the feed screen 2;
the setting of charging panel multichannel power supply circuit breaker and feed screen multiple connection circuit breaker provides convenience for the safe transfer of power supply transfer, the feed screen can be convenient supply power in 1#, 2# direct current system and transfer, simultaneously, when this system when normal use, also can switch between 1# direct current system power supply and 2# direct current system power supply mode through the change over switch that sets up on 1# direct current system charging screen and 2# direct current system charging screen to deal with the emergency of one of them set of system inefficacy.
As shown in fig. 1, the above step 1 includes the steps of:
step 1.1, power supply transfer, connecting 14K and 24K by using a cable, switching on 14K and 24K, disconnecting 12K and 13K, removing the cable between 12K and 13K, supplying power to the No. 1 direct current system feed screen 1 by the No. 2 direct current system feed screen 1,
connecting 16K and 26K by using a cable, switching on 16K and 26K, switching off 11K and 15K, and removing the cable between 11K and 15K, wherein the No. 1 direct current system feed screen 2 is supplied with power by the No. 2 direct current system feed screen 2;
step 1.2, removing a storage battery output cable from a storage battery pack of the 1# direct current system to a charging screen of the 1# direct current system, disconnecting a power inlet wire breaker of the charging screen of the 1# direct current system, and removing a power inlet wire cable of the charging screen of the 1# direct current system;
and step 1.3, removing the charging screen of the 1# direct current system.
The step 2 comprises the following steps:
step 2.1, installing a new No. 1 direct current system feed screen 2 at the position of the dismantled No. 1 direct current charging screen;
step 2.2, connecting 13K with a connecting breaker 15K 'of the new No. 1 direct current system feed screen 2 by using a cable, closing 13K and 15K', and supplying power to the new No. 1 direct current system feed screen 2 by connecting the No. 1 direct current system feed screen 1 with the breaker 13K;
and 2.3, load transfer, laying a new No. 1 direct current system feed screen 2 branch feeder cable, and transferring the load on the original No. 1 direct current system feed screen 2 to the new No. 1 direct current system feed screen 2.
As shown in fig. 1, the above step 3 includes the steps of:
3.1, disconnecting 16K and 26K, removing cables between 16K and 26K, and disconnecting the feed screen 2 of the 1# direct current system from the feed screen 2 of the 2# direct current system;
3.2, removing the feed screen 2 of the 1# direct current system, and installing a new feed screen 1 of the 1# direct current system at the original position;
3.3, connecting 26K with a new No. 1 direct current system feed screen 2 connecting breaker 16K 'by using a cable, closing 26K and 16K', disconnecting 13K and 15K ', removing the cable between 13K and 15K', and supplying power to the new No. 1 direct current system feed screen 2 by connecting the No. 2 direct current system feed screen 2 with the breaker 26K;
step 3.4, connecting the 15K ' with a new No. 1 direct current system feed screen 1 connecting breaker 13K ' by using a cable, closing the 15K ' and the 13K ', and supplying power to the new No. 1 direct current system feed screen 1 by connecting the new No. 1 direct current system feed screen 2 with the breaker 15K ';
and 3.5, load transfer, laying a feeder cable of a branch 1 of the feed screen of the new 1# direct current system, and transferring the load on the feed screen 1 of the original 1# direct current system to the feed screen 1 of the new 1# direct current system.
As shown in fig. 1, the above step 4 includes the steps of:
step 4.1, disconnecting 14K and 24K, removing cables between 14K and 24K, and disconnecting the feed screen 1 of the 1# direct current system from the feed screen 1 of the 2# direct current system;
step 4.2, removing the feed screen 1 of the 1# direct current system, and installing a new charging screen of the 1# direct current system at the original position;
step 4.3, connecting and supplying power to a storage battery pack of the charging screen of the new 1# direct current system, laying a storage battery output cable from the storage battery pack of the 1# direct current system to the charging screen of the new 1# direct current system, laying a power inlet cable of the charging screen of the new 1# direct current system, and closing a power inlet circuit breaker of the charging screen of the new 1# direct current system;
step 4.4, connecting the charging screen power supply circuit breakers 12K ' and 14K ' of the new 1# direct current system by cables, switching on 12K ' and 14K ', switching off 13K ' and 15K ', and removing the cables between 13K ' and 15K ', wherein the feeding screen 1 of the new 1# direct current system is supplied with power by the charging screen power supply circuit breaker 12K ' of the new 1# direct current system;
step 4.5, connecting the charging screen power supply circuit breaker 11K 'and the charging screen power supply circuit breaker 15K' of the new 1# direct current system by using a cable, closing the 11K 'and the 15K', and connecting the charging screen of the new 1# direct current system with the feeding screen 2 of the new 1# direct current system;
step 4.6, connecting 24K with a connecting breaker 13K ' of the new No. 1 direct current system feed screen 1 by using a cable, closing 24K and 13K ', disconnecting 22K and 23K, removing the cable between 22K and 23K, and supplying power to the No. 2 direct current system feed screen 1 by connecting the new No. 1 direct current system feed screen 1 with the connecting breaker 13K ';
and 4.7, disconnecting 21K and 25K, removing the cable between 21K and 25K, and connecting the feed screen 2 of the 2# direct current system with a breaker 16K' for power supply through the feed screen 2 of the new 1# direct current system.
As shown in fig. 1, the above step 5 includes the steps of:
step 5.1, removing a storage battery output cable from a storage battery pack of the 2# direct current system to a charging screen of the 2# direct current system, disconnecting a power inlet wire breaker of the charging screen of the 2# direct current system, and removing the power inlet wire cable of the charging screen of the 2# direct current system;
step 5.2, removing the 2# direct current system charging screen, and installing a new 2# direct current system feeding screen 2 in the original position;
step 5.3, connecting 23K with a breaker 26K 'connected with the feed screen 2 of the new 2# direct current system by a cable, closing 23K and 26K', and supplying power to the feed screen 2 of the new 2# direct current system by connecting the feed screen 1 of the 2# direct current system with the breaker 23K;
and 5.4, load transfer, laying a 2-branch feeder cable of the feed screen of the new 2# direct current system, and transferring the load on the feed screen 2 of the original 2# direct current system to the feed screen 2 of the new 2# direct current system.
As shown in fig. 1, the above step 6 includes the steps of:
6.1, disconnecting 16K 'and 26K, removing cables between 16K' and 26K, and disconnecting the 2# direct current system feed screen 2 from the new 1# direct current system feed screen 2;
6.2, removing the original 2# direct current system feed screen 2, and installing a new 2# direct current system feed screen 1 in the original position;
step 6.3, connecting 16K ' with 25K ' by using a cable, switching on 16K ', 25K ', switching off 23K and 26K ', detaching the cable between 23K and 26K ', and connecting the new No. 2 direct current system feed screen 2 with the new No. 1 direct current system feed screen 2 to a breaker 16K ' for power supply;
step 6.4, connecting the new 2# direct current system feed screen 1 with the circuit breakers 24K ' and 26K ' by cables, closing the 24K ' and 26K ', and supplying power to the new 2# direct current system feed screen 1 by connecting the new 2# direct current system feed screen 2 with the circuit breaker 26K ';
and 6.5, load transfer, laying a feeder cable of a branch 1 of the feed screen of the new 2# direct current system, and transferring the load on the feed screen 1 of the original 2# direct current system to the feed screen 1 of the new 2# direct current system.
As shown in fig. 1, the above step 7 includes the steps of:
7.1, disconnecting 13K 'and 24K, removing the cable between 13K' and 24K, and disconnecting the feed screen 1 of the 2# direct current system and the feed screen 1 of the new 1# direct current system;
7.2, removing the original 2# direct current system feed screen 1, and installing a new 2# direct current system charging screen in the original position;
7.3, connecting and supplying power to a storage battery pack of a charging screen of the new 2# direct current system, laying a storage battery output cable from the storage battery pack of the new 2# direct current system to the charging screen of the new 2# direct current system, laying a power inlet cable of the charging screen of the new 2# direct current system, and closing a power inlet circuit breaker of the charging screen of the new 2# direct current system;
step 7.4, connecting the power supply circuit breakers 22K ' and 22K ' of the charging screen of the new 2# direct current system by cables, switching on 22K ' and 22K ', switching off 24K ' and 26K ', and removing the cables between 24K ' and 26K ', wherein the power supply circuit breaker 22K ' of the charging screen of the new 2# direct current system supplies power to the feed screen 1 of the new 2# direct current system;
and 7.5, connecting the power supply circuit breakers 21K ' and 26K ' of the charging screen of the new 2# direct current system by cables, switching on 21K ' and 26K ', switching off 16K ' and 25K ', and removing the cables between 16K ' and 25K ', wherein the power supply circuit breaker 21K ' of the charging screen of the new 2# direct current system supplies power to the feed screen 2 of the new 2# direct current system.
In the power supply transfer process, the idle connection breaker of the feed screen is connected with other feed screens, the breaker is closed to be electrically connected with the target feed screen, then the breaker connected with the electric cabinet to be dismantled is disconnected, the cable is dismantled, transfer non-electric operation is realized by the disconnection of the breaker, and the load of the feed screen is always electrified in the transfer process.
Above-mentioned removal in-process of screen charges, earlier make its feed screen of former power supply shift to other electric cabinets power supplies through the power transfer, then with the screen of charging and storage battery and with the power between be connected in proper order the disconnection, because place in the screen of charging in the power supply DC bus, can not leave naked electrified copper bar on the scene after the screen of charging is demolishd, the safety risk that the naked electrified copper bar brought in the whole change in-process rest process has been avoided, also need not originally to the setting of the safe isolation region of original region to naked copper bar.
In the process of dismantling the feed screen, the load of the original feed screen is transferred to a newly installed feed cabinet, then the original feed screen is subjected to power-off dismantling operation, the load of the original feed screen is transferred to other existing feed screens in some existing replacing methods, the number of redundant feed lines of the existing feed screen is required to be larger than that of the feed screen needing load transfer, the feed screen is limited more, a large number of residual feed lines are not reasonable in economic cost when the feed screen is used, in the process of dismantling the feed screen, cables are dismantled from the lower part of a power-off circuit breaker, instead of dismantling the cables from an electrified direct current bus in many existing systems, and safety is greatly improved.
After the replacement is completed, the whole system still keeps the 1# direct current system charging screen to supply power for the 1# direct current system feeding screen 1 and the 1# direct current system feeding screen 2, the 2# direct current system charging screen supplies power for the 2# direct current system feeding screen 1 and the 2# direct current system feeding screen 1, the circuit structure of the system is not changed, and the original circuit structure and operation setting are still followed.
Claims (8)
1. A220V double-charging four-feed direct current system uninterrupted safe replacement method is characterized by comprising the following steps:
step 1, transferring power supply of a feed screen 1 and a feed screen 2 of a 1# direct current system to a 2# direct current system, and dismantling a charging screen of the original 1# direct current system;
step 2, installing a new No. 1 direct current system feed screen 2, and transferring the load on the original No. 1 direct current system feed screen 2 to the new No. 1 direct current system feed screen 2;
step 3, dismantling the original 1# direct current system feed screen 2, installing a new 1# direct current system feed screen 1, and transferring the load on the original 1# direct current system feed screen 1 to the new 1# direct current system feed screen 1;
step 4, dismantling the original 1# direct current system feed screen 1, installing a new 1# direct current system charging screen, performing power supply connection on the new 1# direct current system feed screen 1 and the feed screen 2 and the new 1# direct current system charging screen, and transferring power supply of the 2# direct current system feed screen 1 and the feed screen 2 to a new 2# direct current system;
step 5, dismantling the original 2# direct current system charging screen, installing a new 2# direct current system feeding screen 2, and transferring the load on the original 2# direct current system feeding screen 2 to the new 2# direct current system feeding screen 2;
step 6, dismantling the original 2# direct current system feed screen 2, installing a new 2# direct current system feed screen 1, and transferring the load on the original 2# direct current system feed screen 1 to the new 2# direct current system feed screen 1;
step 7, dismantling the original 2# direct current system feed screen 1, installing a new 2# direct current system charging screen, and transferring power supply of the new 2# direct current system feed screen 1 and the feed screen 2 to the new 2# direct current system charging screen;
a DC220V power supply direct current bus KM1+ and KM 1-and power supply circuit breakers 11K and 12K connected with the power supply direct current bus are arranged in the charging screen of the 1# direct current system;
two connecting circuit breakers 13K and 14K are arranged in the No. 1 direct current system feed screen 1, and two connecting circuit breakers 15K and 16K are arranged in the No. 1 direct current system feed screen 2;
the power supply breaker 11K is connected with the connecting breaker 15K, the power supply breaker 12K is connected with the connecting breaker 13K, and the 1# direct current system charging screen supplies power to the 1# direct current system feed screen 1 and the feed screen 2;
a DC220V power supply direct current bus KM2+ and KM 2-and power supply circuit breakers 21K and 22K connected with the power supply direct current bus are arranged in the 2# direct current system charging screen;
two connecting circuit breakers 23K and 24K are arranged in the No. 2 direct current system feed screen 1, and two connecting circuit breakers 25K and 26K are arranged in the No. 2 direct current system feed screen 2;
the power supply circuit breaker 21K is connected with the connecting circuit breaker 25K, the power supply circuit breaker 22K is connected with the connecting circuit breaker 23K, and the 2# direct current system charging screen supplies power for the 2# direct current system feeding screen 1 and the feeding screen 2.
2. The uninterrupted safe replacement method for the 220V two-charging four-feeding direct current system as claimed in claim 1, wherein the step 1 comprises the following steps:
step 1.1, power supply transfer, namely connecting 14K and 24K by using a cable, switching on 14K and 24K, switching off 12K and 13K, and removing the cable between 12K and 13K, wherein the 1# direct current system feed screen 1 is powered by the 2# direct current system feed screen 1;
connecting 16K and 26K by using a cable, switching on 16K and 26K, switching off 11K and 15K, and removing the cable between 11K and 15K, wherein the No. 1 direct current system feed screen 2 is supplied with power by the No. 2 direct current system feed screen 2;
step 1.2, removing a storage battery output cable from a storage battery pack of the 1# direct current system to a charging screen of the 1# direct current system, disconnecting a power inlet wire breaker of the charging screen of the 1# direct current system, and removing a power inlet wire cable of the charging screen of the 1# direct current system;
and step 1.3, removing the charging screen of the 1# direct current system.
3. The uninterrupted safe replacement method for the 220V two-charging four-feeding direct current system as claimed in claim 1, wherein the step 2 comprises the following steps:
step 2.1, installing a new No. 1 direct current system feed screen 2 at the position of the dismantled No. 1 direct current charging screen;
step 2.2, connecting 13K with a connecting breaker 15K 'of the new No. 1 direct current system feed screen 2 by using a cable, closing 13K and 15K', and supplying power to the new No. 1 direct current system feed screen 2 by connecting the No. 1 direct current system feed screen 1 with the breaker 13K;
and 2.3, load transfer, laying a new No. 1 direct current system feed screen 2 branch feeder cable, and transferring the load on the original No. 1 direct current system feed screen 2 to the new No. 1 direct current system feed screen 2.
4. The uninterrupted safe replacement method for the 220V two-charging four-feeding direct current system as claimed in claim 1, wherein the step 3 comprises the following steps:
3.1, disconnecting 16K and 26K, removing cables between 16K and 26K, and disconnecting the feed screen 2 of the 1# direct current system from the feed screen 2 of the 2# direct current system;
3.2, removing the feed screen 2 of the 1# direct current system, and installing a new feed screen 1 of the 1# direct current system at the original position;
3.3, connecting 26K with a new No. 1 direct current system feed screen 2 connecting breaker 16K 'by using a cable, closing 26K and 16K', disconnecting 13K and 15K ', removing the cable between 13K and 15K', and supplying power to the new No. 1 direct current system feed screen 2 by connecting the No. 2 direct current system feed screen 2 with the breaker 26K;
step 3.4, connecting the 15K ' with a new No. 1 direct current system feed screen 1 connecting breaker 13K ' by using a cable, closing the 15K ' and the 13K ', and supplying power to the new No. 1 direct current system feed screen 1 by connecting the new No. 1 direct current system feed screen 2 with the breaker 15K ';
and 3.5, load transfer, laying a feeder cable of a branch 1 of the feed screen of the new 1# direct current system, and transferring the load on the feed screen 1 of the original 1# direct current system to the feed screen 1 of the new 1# direct current system.
5. The uninterrupted safe replacement method for the 220V two-charging four-feeding direct current system as claimed in claim 1, wherein the step 4 comprises the following steps:
step 4.1, disconnecting 14K and 24K, removing cables between 14K and 24K, and disconnecting the feed screen 1 of the 1# direct current system from the feed screen 1 of the 2# direct current system;
step 4.2, removing the feed screen 1 of the 1# direct current system, and installing a new charging screen of the 1# direct current system at the original position;
step 4.3, connecting and supplying power to a storage battery pack of the charging screen of the new 1# direct current system, laying a storage battery output cable from the storage battery pack of the 1# direct current system to the charging screen of the new 1# direct current system, laying a power inlet cable of the charging screen of the new 1# direct current system, and closing a power inlet circuit breaker of the charging screen of the new 1# direct current system;
step 4.4, connecting the charging screen power supply circuit breakers 12K ' and 14K ' of the new 1# direct current system by cables, switching on 12K ' and 14K ', switching off 13K ' and 15K ', and removing the cables between 13K ' and 15K ', wherein the feeding screen 1 of the new 1# direct current system is supplied with power by the charging screen power supply circuit breaker 12K ' of the new 1# direct current system;
step 4.5, connecting the charging screen power supply circuit breaker 11K 'and the charging screen power supply circuit breaker 15K' of the new 1# direct current system by using a cable, closing the 11K 'and the 15K', and connecting the charging screen of the new 1# direct current system with the feeding screen 2 of the new 1# direct current system;
step 4.6, connecting 24K with a connecting breaker 13K ' of the new No. 1 direct current system feed screen 1 by using a cable, closing 24K and 13K ', disconnecting 22K and 23K, removing the cable between 22K and 23K, and supplying power to the No. 2 direct current system feed screen 1 by connecting the new No. 1 direct current system feed screen 1 with the connecting breaker 13K ';
and 4.7, disconnecting 21K and 25K, removing the cable between 21K and 25K, and connecting the feed screen 2 of the 2# direct current system with a breaker 16K' for power supply through the feed screen 2 of the new 1# direct current system.
6. The uninterrupted safe replacement method for the 220V two-charging four-feeding direct current system as claimed in claim 1, wherein the step 5 comprises the following steps:
step 5.1, removing a storage battery output cable from a storage battery pack of the 2# direct current system to a charging screen of the 2# direct current system, disconnecting a power inlet wire breaker of the charging screen of the 2# direct current system, and removing the power inlet wire cable of the charging screen of the 2# direct current system;
step 5.2, removing the 2# direct current system charging screen, and installing a new 2# direct current system feeding screen 2 in the original position;
step 5.3, connecting 23K with a breaker 26K 'connected with the feed screen 2 of the new 2# direct current system by a cable, closing 23K and 26K', and supplying power to the feed screen 2 of the new 2# direct current system by connecting the feed screen 1 of the 2# direct current system with the breaker 23K;
and 5.4, load transfer, laying a 2-branch feeder cable of the feed screen of the new 2# direct current system, and transferring the load on the feed screen 2 of the original 2# direct current system to the feed screen 2 of the new 2# direct current system.
7. The uninterrupted safe replacement method for the 220V two-charging four-feeding direct current system as claimed in claim 1, wherein the step 6 comprises the following steps:
6.1, disconnecting 16K 'and 26K, removing cables between 16K' and 26K, and disconnecting the 2# direct current system feed screen 2 from the new 1# direct current system feed screen 2;
6.2, removing the original 2# direct current system feed screen 2, and installing a new 2# direct current system feed screen 1 in the original position;
step 6.3, connecting 16K ' with 25K ' by using a cable, switching on 16K ', 25K ', switching off 23K and 26K ', detaching the cable between 23K and 26K ', and connecting the new No. 2 direct current system feed screen 2 with the new No. 1 direct current system feed screen 2 to a breaker 16K ' for power supply;
step 6.4, connecting the new 2# direct current system feed screen 1 with the circuit breakers 24K ' and 26K ' by cables, closing the 24K ' and 26K ', and supplying power to the new 2# direct current system feed screen 1 by connecting the new 2# direct current system feed screen 2 with the circuit breaker 26K ';
and 6.5, load transfer, laying a feeder cable of a branch 1 of the feed screen of the new 2# direct current system, and transferring the load on the feed screen 1 of the original 2# direct current system to the feed screen 1 of the new 2# direct current system.
8. The non-power-off safe replacement method for the 220V two-charging four-feeding direct current system as claimed in claim 1, wherein the step 7 comprises the following steps:
7.1, disconnecting 13K 'and 24K, removing the cable between 13K' and 24K, and disconnecting the feed screen 1 of the 2# direct current system and the feed screen 1 of the new 1# direct current system;
7.2, removing the original 2# direct current system feed screen 1, and installing a new 2# direct current system charging screen in the original position;
7.3, connecting and supplying power to a storage battery pack of a charging screen of the new 2# direct current system, laying a storage battery output cable from the storage battery pack of the new 2# direct current system to the charging screen of the new 2# direct current system, laying a power inlet cable of the charging screen of the new 2# direct current system, and closing a power inlet circuit breaker of the charging screen of the new 2# direct current system;
step 7.4, connecting the power supply circuit breakers 22K ' and 22K ' of the charging screen of the new 2# direct current system by cables, switching on 22K ' and 22K ', switching off 24K ' and 26K ', and removing the cables between 24K ' and 26K ', wherein the power supply circuit breaker 22K ' of the charging screen of the new 2# direct current system supplies power to the feed screen 1 of the new 2# direct current system;
and 7.5, connecting the power supply circuit breakers 21K ' and 26K ' of the charging screen of the new 2# direct current system by cables, switching on 21K ' and 26K ', switching off 16K ' and 25K ', and removing the cables between 16K ' and 25K ', wherein the power supply circuit breaker 21K ' of the charging screen of the new 2# direct current system supplies power to the feed screen 2 of the new 2# direct current system.
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