CN113363968B - Method for transferring load of power distribution system of new and old transformer substation without power outage - Google Patents
Method for transferring load of power distribution system of new and old transformer substation without power outage Download PDFInfo
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- CN113363968B CN113363968B CN202110606237.4A CN202110606237A CN113363968B CN 113363968 B CN113363968 B CN 113363968B CN 202110606237 A CN202110606237 A CN 202110606237A CN 113363968 B CN113363968 B CN 113363968B
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
- H02J3/0075—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source according to economic or energy efficiency considerations, e.g. economic dispatch
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/222—Demand response systems, e.g. load shedding, peak shaving
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Abstract
The invention relates to a method for transferring load of a power distribution system of a new and old transformer substation without power outage, which comprises the following steps of 1, switching a first-loop 110kV power supply of an old station to a new station, and carrying out no-load test operation on equipment of the new station; step 2, transferring the 6kV loads of the old stations to the new stations one by one, wherein in the transferring process, a first 6kV switching station keeps loop closing operation, and a second 6kV switching station keeps loop closing operation; and 3, switching the second-time 110kV power supply of the old station to the new station to complete load transfer. The invention can still normally supply power in the process of transferring load, realizes stable transition, solves the problem of risk caused by the operation of a single power supply of a new transformer substation and an old transformer substation, can improve the operation reliability of the new transformer substation and the old transformer substation without increasing investment, and can do more beneficial things with the same cost.
Description
Technical Field
The invention relates to a method for transferring loads of a power distribution system, in particular to a method for transferring loads of a power distribution system of a new transformer substation and an old transformer substation without power outage.
Background
When equipment of a110 kV transformer substation (called an old substation for short) is aged and needs to be transformed, the problems of high in-situ transformation difficulty, long power failure time and the like exist, so that another 110kV transformer substation (called a new substation for short) is newly built near the old substation instead of transforming the old substation in situ, and when the new substation is built and needs to be put into operation, load transfer and switching between the new and old transformer substations need to be completed.
The main wiring mode of the new station and the old station is similar: 2 times of 110kV power supply incoming lines, wherein a110 kV bus is a single bus section, 2 31.5MVA main transformers and 6kV buses are single bus sections, and 21 times of 6kV cable feeder lines are provided. When load migration and switching between a new substation and an old substation exist, the following problems exist:
in the 6kV load transfer stage, because of the production requirements of part of users, the loads need to be transferred without power outage, the loads are difficult to be transferred without power outage in a new transformer substation and an old transformer substation, and the stable transition of the new transformer substation and the old transformer substation is difficult to realize;
and during the live-line operation of the old station and the new station, the old station and the new station only have 1-circuit 110kV power line to carry respective equipment and load operation of the whole station, so that the safety of the operation of the transformer stations is greatly reduced, and the power supply risk is increased by 50% by the single power operation.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method for transferring loads of a power distribution system of a new transformer substation and an old transformer substation without power outage, which can still supply power normally in the process of transferring the loads, realize stable transition and solve the risk problem caused by single power supply operation of the new transformer substation and the old transformer substation.
The technical purpose of the invention is realized by the following technical scheme:
a method for transferring load of a power distribution system of a new substation and an old substation without power outage comprises the following steps,
step 1, switching a first-time 110kV power supply of an old station to a new station, and carrying out no-load test operation on equipment of the new station;
and 3, switching the second-time 110kV power supply of the old station to the new station to complete load transfer.
In one embodiment, in step 2.1, the feeder line A1F15# between the old station 6kV2 section and the second 6kV switching station is powered off and quit, the feeder line A1F0# of the old station 6kV1 section continuously supplies power, and all load operation of the second 6kV switching station is supplied with power by the old station due to the fact that a D6012 switch is in a closed state;
the section 6kV2 of the new station is electrically connected with the section D6kV2 of the second 6kV switching station through a B1F15# feeder line, the load operation of the section D6kV1 in the second 6kV switching station is powered by the first main transformer of the old station, the load operation of the section D6kV2 is powered by the second main transformer of the new station, and the step is continuously carried out until all the 6kV loads of the old station are transferred and accessed into the new station; due to the fact that the D6012 switch is in the closed state, the A1F0# feeder line and the B1F15# feeder line of the second 6kV switching station are in loop closing operation, and the loop closing operation is equivalent to the loop closing operation of the 110kV power supply 1 of the old station and the 110kV power supply 2 of the new station indirectly.
In one embodiment, step 2.2, a C6012 switch in the first 6kV switching station is turned on, a C2 switch in a C6kV2 section is turned off, an a2 switch in an old station 6kV2 section is turned off, a feeder between a old station 6kV2 section and a C6kV2 section is out of operation, and since the C6kV1 section and the C6kV2 section are communicated through a feeder where the C6012 switch is located, all loads of the first 6kV switching station are supplied with power by the old station 6kV1 section;
and connecting a feeder line where the C2 switch of the C6kV2 section is located into a B2 switch of a 6kV2 section of a new station, closing the B2 switch and a C2 switch of the first 6kV switching station, and enabling the C6kV1 section and the C6kV2 section of the first 6kV switching station to operate in a closed loop mode.
In one embodiment, step 2.3, the C1 switch of the first 6kV switching station is disconnected, the a1 switch of the old station 6kV1 section is disconnected, the feeder where the a1 switch is located is out of operation, and all loads of the first 6kV switching station are supplied with power by the second main transformer of the new station;
and connecting a feeder line where the C1 switch of the first 6kV switching station is located to a B1 switch of a 6kV1 section of the new station, and closing a B1 switch and a C1 switch to enable the 6kV1 section of the new station and the 6kV2 section of the new station to perform closed-loop operation.
In one embodiment, step 2.4, the C6012 switch of the first 6kV switching station and the D6012 switch of the second 6kV switching station are turned off, the ring opening operation is completed, and the first 6kV switching station and the second 6kV switching station are powered by the first main transformer of the new station and the second main transformer of the new station respectively.
In one embodiment, an old station first main transformer and an old station second main transformer are arranged in the old station, the capacities of the old station first main transformer and the old station second main transformer are both 31.5MVA, the specifications of an A601 switch of a voltage-reduction side old station 6kV1 section and an A602 switch of an old station 6kV2 section are 4000A, and the cut-off capacity is 40 kA.
In one embodiment, the A1F0# feeder of the old station 6kV1 section and the A1F15# feeder of the old station 6kV2 section have the specification of 4000A and the breaking capacity of 40 kA.
In one embodiment, a new station first main transformer and a new station second main transformer are arranged in the new station, the capacities of the new station first main transformer and the new station second main transformer are both 40MVA, the specifications of a B601 switch of a new station 6kV1 section at the voltage low side and a B602 switch of a new station 6kV2 section are 4000A, and the cut-off capacity is 40 kA.
In one embodiment, the specification of the B1F0# feeder of the new station 6kV1 section and the B1F15# feeder of the new station 6kV2 section is 4000A, and the cut-off capacity is 40 kA.
In one embodiment, during the loop closing operation, the load difference between the old station first main transformer and the old station second main transformer and the load difference between the new station first main transformer and the new station second main transformer are controlled to be lower than 50%, and the overload of equipment caused by the overlarge loop closing current is avoided.
In conclusion, the invention has the following beneficial effects:
the invention is suitable for substations of various voltage grades, realizes the stable transfer of the load of the old substation to the new substation, reduces the power supply to the user to the minimum, is favorable for improving the stability, the continuity and the reliability of a power supply system, has great significance for the user who is difficult to cut off power and good social benefit, simultaneously solves the problem of improving the risk caused by the single power supply operation of the new and old substations, and is favorable for reducing the operation risk of the substations.
Drawings
FIG. 1 is a schematic diagram of an old station of the present invention;
FIG. 2 is a schematic diagram of a new station of the present invention;
FIG. 3 is a schematic wiring diagram of a C6kV2 section feeder transfer load of a first 6kV switchyard of the present invention;
fig. 4 is a schematic wiring diagram of a C6kV1 segment feeder transfer load of a first 6kV switchyard of the present invention;
FIG. 5 is a schematic diagram of a new station as a backup power source for an old station;
fig. 6 is a schematic diagram of an old station as a backup power source for a new station.
In the figure, the shaded portion of the switch indicates that the switch is in a closed state, and the blank portion of the switch indicates that the switch is in an open state.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
It should be noted that all the directional terms such as "upper" and "lower" referred to herein are used with respect to the view of the drawings, and are only for convenience of description, and should not be construed as limiting the technical solution.
The invention provides a method for transferring load of a power distribution system of a new transformer substation and an old transformer substation without power outage,
step 1, switching a first-time 110kV power supply of an old station to a new station, and carrying out no-load test operation on equipment of the new station; installing primary equipment, secondary equipment, cable facilities and the like of a transformer substation in each built functional building of a new station, completing handover tests of all equipment such as an integrated automation system, power dispatching automation and a communication system thereof, debugging work such as dotting of the secondary equipment and joint debugging work of the whole system, and having the condition of power transmission starting; the step does not relate to the reconstruction work of the old station;
and 3, switching the second-time 110kV power supply of the old station to the new station to complete load transfer.
In the present invention, as shown in fig. 1, the old station includes: 2 times of 110kV power supply incoming lines, wherein 110kV buses are single bus segments and are divided into two segments, 2 31.5MVA main transformers and 6kV buses are single bus segments and are divided into two segments, and 21 times of 6kV cable feeder lines are fed; the 2-loop 110kV power supply is respectively and electrically connected with two sections of 110kV buses, the two sections of 110kV bus electric connections are respectively and electrically connected with 2 31.5MVA main transformers (namely a first main transformer of an old station and a second main transformer of the old station), the 2 31.5MVA main transformers are respectively and electrically connected with two sections of 6kV buses, the two sections of 6kV buses are respectively and electrically connected with 21-loop 6kV cable feeder lines, and the 110kV voltage is reduced to 6kV voltage for use;
the 110kV bus is divided into an old station 110kV1 section and an old station 110kV2 section, and the 6kV bus is divided into an old station 6kV1 section and an old station 6kV2 section.
The old station 110kV1 section and the old station 110kV2 section are electrically connected through a line with an A1012 switch; an A1357 switch is arranged between the 110kV power supply and the 110kV1 section of the old station, and an A1358 switch is arranged between the 110kV power supply and the 110kV2 section of the old station; an A1101 switch is arranged between the section 110kV1 of the old station and a first main transformer of the old station, and an A1102 switch is arranged between the section 110kV2 of the old station and a second main transformer of the old station; an old station 601 switch is arranged between the first main transformer of the old station and the section 6kV1 of the old station, and an old station 602 switch is arranged between the second main transformer of the old station and the section 6kV2 of the old station; the old station 6kV1 section and the old station 6kV2 section are electrically connected through a line with an A6012 switch; an old station 6kV1 section is provided with an A1FO # feeder line, and an old station 6kV2 section is provided with an A1F15# feeder line.
The new station is connected to the old station in a similar manner, as shown in fig. 2, and comprises: 2 times of 110kV power supply incoming lines, wherein 110kV buses are single bus segments and are divided into two segments, 2 40MVA main transformers and 6kV buses are single bus segments and are divided into two segments, and 21 times of 6kV cable feeder lines are fed back; the 2-loop 110kV power supply is respectively and electrically connected with two sections of 110kV buses, the two sections of 110kV buses are respectively and electrically connected with 2 40MVA main transformers (namely a first main transformer of a new station and a second main transformer of the new station), the 2 40MVA main transformers are respectively and electrically connected with two sections of 6kV buses, the two sections of 6kV buses are respectively and electrically connected with 21-loop 6kV cable feeder lines, and the 110kV voltage is reduced to 6kV voltage for use;
wherein, the 110kV bus is divided into a new station 110kV1 section and a new station 110kV2 section, and the 6kV bus is divided into a new station 6kV1 section and a new station 6kV2 section.
The new station 110kV1 section and the new station 110kV2 section are electrically connected through a line with a B1012 switch; a B1357 switch is arranged between the 110kV power supply and the 110kV1 section of the new station, and a B1358 switch is arranged between the 110kV power supply and the 110kV2 section of the new station; a B1101 switch is arranged between the section 110kV1 of the new station and a first main transformer of the new station, and a B1102 switch is arranged between the section 110kV2 of the new station and a second main transformer of the new station; a new station 601 switch is arranged between the section of the first main transformer of the new station and the section of 6kV1 of the new station, and a new station 602 switch is arranged between the section of the second main transformer of the new station and the section of 6kV2 of the new station; the section 6kV1 of the new station is electrically connected with the section 6kV2 of the new station through a line with a B6012 switch; a section of 6kV1 of the new station is provided with a B1FO # feeder line, and a section of 6kV2 of the new station is provided with a B1F15# feeder line.
From the path of electric power circulation, the electric power that flows out at old station or new station respectively gets into first 6kV switchyard and second 6kV switchyard, wherein, first 6kV switch section includes C6kV1 section and C6kV2 section, sets up C6012 switch between C6kV1 section and C6kV2 section, and second 6kV switch section includes D6kV1 section and D6kV2 section, sets up D6012 switch between D6kV1 section and D6kV2 section.
When the old station is normally used, the section 6kV1 of the old station is electrically connected with the section D6kV1 through an A1 # feeder line 1FO, and the section 6kV1 of the old station is electrically connected with the section C6kV1 through a line with an A1 switch and a C1 switch; the old station 6kV2 section is electrically connected with the D6kV2 section through an A1F15# feeder line, the old station 6kV2 section is electrically connected with the C6kV2 section through a line with an A2 switch and a C2 switch, namely, the load operation of the first 6kV switch station and the second 6kV switch station is completely borne by the old station.
It can be seen that when a new station is put into normal use, the new station needs to bear all the load operations of the first 6kV switching station and the second 6kV switching station, that is: the section 6kV1 of the new station is electrically connected with the section D6kV1 through a B1FO # feeder line, and the section 6kV1 of the new station is electrically connected with the section C6kV1 through a line with a B1 switch and a C1 switch; the section 6kV2 of the new station is electrically connected with the section D6kV2 through a B1F15# feeder, and the section 6kV2 of the new station is electrically connected with the section C6kV2 through a line with a B2 switch and a C2 switch. The invention realizes that the first 6kV switching station and the second 6kV switching station are not influenced and can normally run in the process of switching the load between the old station and the new station.
Each secondary production unit of the iron and steel enterprise is generally provided with a 2-circuit 6kV cable loop, and when one cable feeder is in power failure, the other cable feeder can meet 100% of production load power consumption of each unit. The solution of the invention is feasible.
In the invention, a110 kV power supply is not newly built, the new station still uses the 2-turn 110kV power supply incoming line of the old station, as shown in figures 1-6, the specific implementation method of the invention is as follows:
firstly, closing an A1358 switch at a110 kV2 section of an old station, switching a110 kV power supply at a110 kV2 section of the old station to a110 kV2 section of a new station, and closing a B1358 switch, wherein at the moment, the loads of a first 6kV switching station and a second 6kV switching station are powered by a110 kV power supply with only 1 circuit;
secondly, the A1F15# feeder line between the section 6kV2 of the old station and the second 6kV switching station is cut off and quit, the A1F0# feeder line at the section 6kV1 of the old station continuously supplies power, and all loads of the second 6kV switching station are supplied with power by the old station due to the fact that a D6012 switch is in a closed state;
thirdly, a section 6kV2 of the new station is electrically connected with a section D6kV2 of the second 6kV switching station through a B1F15# feeder line, the load operation of the section D6kV1 in the second 6kV switching station is powered by the first main transformer of the old station, the load operation of the section D6kV2 is powered by the second main transformer of the new station, and the step is continuously carried out until all the 6kV loads of the old station are transferred and accessed into the new station; because the D6012 switch is in a closed state, a feeder A1F0# and a feeder B1F15# of a second 6kV switching station are subjected to loop closing operation, which is equivalent to that a110 kV power supply 1 of an old station and a110 kV power supply 2 of a new station are subjected to loop closing operation indirectly, and the loop closing operation is a necessary condition for transferring loads without power outage of the old station and the new station;
fourthly, a C6012 switch in the first 6kV switch station is turned on, a C2 switch in a C6kV2 section is turned off, an A2 switch in a 6kV2 section of an old station is turned off, a feeder line between the 6kV2 section of the old station and a C6kV2 section is quitted to operate, the C6kV1 section and the C6kV2 section are communicated through the feeder line where the C6012 switch is located, and all loads of the first 6kV switch station are supplied with power by the 6kV1 section of the old station;
fifthly, connecting a feeder line where a C2 switch of the C6kV2 section is located with a B2 switch of a 6kV2 section of a new station, and closing the B2 switch and a C2 switch of a first 6kV switching station to enable the C6kV1 section and the C6kV2 section of the first 6kV switching station to operate in a closed loop mode;
sixthly, disconnecting a C1 switch of the first 6kV switching station, disconnecting an A1 switch of a 6kV1 section of the old station, enabling a feeder line where an A1 switch is located to quit running, and enabling all loads of the first 6kV switching station to be supplied with power by a second main transformer of the new station;
seventhly, connecting a feeder line where a C1 switch of the first 6kV switching station is located to a B1 switch of a 6kV1 section of the new station, closing a B1 switch and a C1 switch, and enabling a 6kV1 section of the new station and a 6kV2 section of the new station to perform closed-loop operation;
and eighthly, disconnecting the C6012 switch of the first 6kV switching station and the D6012 switch of the second 6kV switching station to complete ring opening operation, and enabling the first 6kV switching station and the second 6kV switching station to be powered by a first main transformer of a new station and a second main transformer of the new station respectively.
And step nine, switching the 110kV power supply 1 of the old station into a B1357 switch of a110 kV1 section of the new station, and closing the B1357 switch.
The load transfer work of the 2-circuit power feeder of one user is completed, and the loads of other users are also completed according to the scheme until all the loads of the old station are transferred.
In the closed-loop operation process, the load difference between the first main transformer of the old station and the second main transformer of the old station and the load difference between the first main transformer of the new station and the second main transformer of the new station are controlled to be lower than 50%, and the overload of equipment caused by the overlarge closed-loop current is avoided.
The capacities of the switch 601, the switch 602, the feeder switch 1F0# and the feeder switch 1F15# of the old station and the new station are completely consistent. Thus, the old station and the new station can be contacted. The A1357 switch power supply incoming line of the old station carries all the loads of the old station to operate, and the B1358 switch power supply incoming line of the new station carries all the loads of the new station to operate. The new station and the old station respectively have a return 110kV power supply to operate, the A1F0# feeder is hung on the 6kV system of the old station A to operate, the B1F15# feeder is hung on the 6kV system of the new station B to operate, the A1F0# feeder and the B1F15# feeder of the second 6kV switching station also operate in a single-bus section mode, and therefore the power supply can serve as a second return power supply for the old station and the new station to be mutually standby.
After the A1F15# feeder load of the old station is transferred to a section 6kV2 of a new station of the new station, if the 110kV power supply 1(A1357 switch) of the old station loses power and cannot recover power supply within a short time, the 110kV power supply 2(B1358 switch) of the new station is reduced to 6kV through a main transformer and is sent to a 6kV bus of the old station through a B1F15# feeder of the new station to supply power to all loads of the old station.
As can be seen from fig. 5, the new station can act as a backup power source for the old station, and the new station supplies power to the old station as follows: the 110kV power supply 2(B1358 switch) of the new station → the segment of the new station 110kV2 → the B1102 switch → the second main transformer of the new station → the B602 switch → the segment of the new station 6kV2 → the B1F15# switch → the B1F15# line cable → the segment of the D6kV2 of the second 6kV switching station → the D6012 switch → the segment of the D6kV1 → the A1F0# line cable → the A1F0# switch of the old station → the segment of the old station 6kV1 → the a6012 switch → the segment of the old station 6kV2 → the power supply to all the 6kV loads of the old station.
On the contrary, if the 110kV power supply 2(B1358 switch) of the new station loses power and cannot recover power supply within a short time, the 110kV power supply 1(a1357 switch) of the old station is stepped down to 6kV through the main transformer and is sent to the 6kV bus of the new station through the A1F0# feeder to supply power to all loads of the new station. The supply route map is as follows:
as shown in fig. 6, the old station is routed to the new station as follows: the 110kV power supply 1(a1357 switch) of the old station → the old station 110kV1 segment → a1101 switch → the first main transformer of the old station → a601 switch → the old station 6kV1 segment → A1F0# switch → A1F0# line cable → the D6kV1 segment of the second 6kV switching station → D6012 switch → D6kV2 segment → B1F15# line cable → the B1F15# switch of the new station → the new station 6kV2 segment → B6012 switch → the new station 6kV1 segment → supply of power to all the 6kV loads of the new station.
The invention can realize mutual standby in the process of transferring load without power cut, thereby greatly improving the operation reliability. By adding the 6kV connecting line between the old station and the new station, the operation reliability during the load transfer and access to the new station can be increased by more than 50%, the method is particularly suitable for a newly-built transformer substation, but on a reconstruction project that a power supply is not newly increased, the operation reliability of the new station and the old station can be improved without newly increasing investment, and the same cost can be used for doing more beneficial things.
The invention is suitable for substations of various voltage grades, realizes the stable transfer of the load of the old substation to the new substation, reduces the power supply to the user to the minimum, is favorable for improving the stability, the continuity and the reliability of a power supply system, has great significance for the user who is difficult to cut off power and good social benefit, simultaneously solves the problem of improving the risk caused by the single power supply operation of the new and old substations, and is favorable for reducing the operation risk of the substations.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (6)
1. A method for transferring load of a power distribution system of a new substation and an old substation without power outage is characterized by comprising the following steps,
step 1, switching a first-time 110kV power supply of an old station to a new station, and carrying out no-load test operation on equipment of the new station;
step 2, transferring the 6kV loads of the old station to the new station one by one, wherein in the transferring process, the first 6kV switch station keeps closed-loop operation, and the second 6kV switch station keeps closed-loop operation;
step 2.1, the A1F15# feeder line between the old station 6kV2 section and the second 6kV switching station is cut off and quit, the A1F0# feeder line of the old station 6kV1 section supplies power continuously, and all loads of the second 6kV switching station are supplied with power by the old station due to the fact that a D6012 switch is in a closed state;
the section 6kV2 of the new station is electrically connected with the section D6kV2 of the second 6kV switching station through a B1F15# feeder line, the load operation of the section D6kV1 in the second 6kV switching station is powered by the first main transformer of the old station, the load operation of the section D6kV2 is powered by the second main transformer of the new station, and the step is continuously carried out until all the 6kV loads of the old station are transferred and accessed into the new station; because the D6012 switch is in a closed state, a A1F0# feeder line and a B1F15# feeder line of a second 6kV switch station are subjected to loop closing operation, and a110 kV power supply 1 of an old station and a110 kV power supply 2 of a new station are subjected to loop closing operation;
2.2, a C6012 switch in the first 6kV switching station is turned on, a C2 switch in a C6kV2 section is turned off, an A2 switch in a 6kV2 section of an old station is turned off, a feeder line between the 6kV2 section of the old station and a C6kV2 section of the old station is withdrawn from operation, the C6kV1 section and the C6kV2 section are communicated through the feeder line where the C6012 switch is located, and all loads of the first 6kV switching station are supplied with power by the 6kV1 section of the old station;
connecting a feeder line of a C2 switch at a C6kV2 section into a B2 switch at a 6kV2 section of a new station, closing the B2 switch and a C2 switch of a first 6kV switching station, and enabling a C6kV1 section and a C6kV2 section of the first 6kV switching station to perform closed-loop operation;
2.3, disconnecting the C1 switch of the first 6kV switching station, disconnecting the A1 switch of the 6kV1 section of the old station, stopping the operation of a feeder line where the A1 switch is located, and supplying power to all loads of the first 6kV switching station by a second main transformer of the new station;
connecting a feeder line where a C1 switch of a first 6kV switching station is located to a B1 switch of a 6kV1 section of a new station, and closing a B1 switch and a C1 switch to enable a 6kV1 section of the new station and a 6kV2 section of the new station to perform closed-loop operation;
step 2.4, disconnecting a C6012 switch of the first 6kV switching station and a D6012 switch of the second 6kV switching station, completing ring opening operation, and enabling the first 6kV switching station and the second 6kV switching station to be powered and operated by a first main transformer of a new station and a second main transformer of the new station respectively;
and 3, switching the second-time 110kV power supply of the old station to the new station to complete load transfer.
2. The method for uninterrupted load transfer of the distribution system of the old and new transformer substations as claimed in claim 1, wherein the old substation is provided with a first main transformer of the old substation and a second main transformer of the old substation, the capacities of the first main transformer of the old substation and the second main transformer of the old substation are both 31.5MVA, the specifications of the switch a601 in the section of the old substation 6kV1 and the switch a602 in the section of the old substation 6kV2 at the voltage-lowering side are 4000A, and the switching-off capacity is 40 kA.
3. The method for uninterrupted load transfer of the distribution system of the old and new substations as claimed in claim 1, wherein the A1F0# feeder of the old station 6kV1 section and the A1F15# feeder of the old station 6kV2 section have the specification of 4000A and the cut-off capacity of 40 kA.
4. The method for uninterrupted load transfer of the distribution system of the old and new substations as claimed in claim 3, wherein the new substation is provided with a first main transformer of the new substation and a second main transformer of the new substation, the capacities of the first main transformer of the new substation and the second main transformer of the new substation are both 40MVA, the specifications of the B601 switch of the new substation in the section of 6kV1 and the B602 switch of the new substation in the section of 6kV2 at the voltage-reduction side are 4000A, and the switching capacity is 40 kA.
5. The method for uninterrupted load transfer of the distribution system of the old and new substations as claimed in claim 4, wherein the B1F0# feeder of the new station 6kV1 section and the B1F15# feeder of the new station 6kV2 section have the specification of 4000A and the cut-off capacity of 40 kA.
6. The method for uninterrupted load transfer of the distribution system of the old and new substations as claimed in any one of claims 1 to 5, wherein during the operation of the closed loop, the difference between the loads of the first main transformer of the old substation and the second main transformer of the old substation and the loads of the first main transformer of the new substation and the second main transformer of the new substation is controlled to be less than 50%, so as to avoid overload of the equipment caused by excessive current of the closed loop.
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