CN112072774B

CN112072774B - Segmented spare power automatic switching implementation method adaptive to 10kV bus operation mode change

Info

Publication number: CN112072774B
Application number: CN202010776744.8A
Authority: CN
Inventors: 李新海; 范德和; 肖星; 孟晨旭; 曾令诚; 周恒�; 曾庆祝; 梁景明; 邱天怡; 罗海鑫; 凌霞
Original assignee: Guangdong Power Grid Co Ltd; Zhongshan Power Supply Bureau of Guangdong Power Grid Co Ltd
Current assignee: Guangdong Power Grid Co Ltd; Zhongshan Power Supply Bureau of Guangdong Power Grid Co Ltd
Priority date: 2020-08-05
Filing date: 2020-08-05
Publication date: 2022-01-21
Anticipated expiration: 2040-08-05
Also published as: CN112072774A

Abstract

The invention provides a method for realizing sectional spare power automatic switching adapting to the change of a 10kV bus operation mode, which solves the problem that the conventional sectional spare power automatic switching does not meet the requirements of a single-bus single-sectional two-section bus and the problem that the function of the sectional spare power automatic switching can be realized when a main transformer becomes low and any branch operates in a double-branch incoming line mode, and comprises the following steps of: s1, collecting a bus wiring mode and determining a main transformer to be put into operation; s2, collecting related electrical quantity and switching value parameters; s3, judging whether the charging of the segmented spare power automatic switching device is finished or not, if so, executing S4; otherwise, not processing; s4, judging whether the operation condition of the sectional backup power automatic switching is met, if so, starting a delay fixed value time, tripping off a main transformer low-voltage switch corresponding to the voltage-loss bus, and executing S5, otherwise, not operating the sectional backup power automatic switching; s5, judging whether a main transformer low-voltage switch corresponding to the voltage-loss bus is in a separating position within the time of a delay fixed value, if so, closing the section switch after the time of the section switch closing delay fixed value, and successfully acting; otherwise, the sectional spare power automatic switching device discharges, and the sectional spare power automatic switching device fails to operate.

Description

Segmented spare power automatic switching implementation method adaptive to 10kV bus operation mode change

Technical Field

The invention relates to the technical field of 10kV bus subsection spare power automatic switching self-adaption switching, in particular to a subsection spare power automatic switching implementation method adapting to 10kV bus operation mode change.

Background

The automatic standby power supply switching device (hereinafter referred to as a standby automatic switching device) is a key device for improving the power supply reliability of a power system, and when a system bus working power supply loses voltage due to a fault, the standby automatic switching device quickly cuts off the working power supply and switches the standby power supply, so that the normal operating voltage of the system bus is restored, and the reliable power supply for a user is guaranteed.

As a typical design of a connection mode of a single-bus double-section four-section bus shown in fig. 1 is generally adopted as a 10kV bus of a transformer substation for collecting, distributing and directly transmitting electric energy to a power supply load, an existing 10kV sectional backup automatic switching device has a function that every two of the four sections of buses are dark standby each other, a 10kV sectional switch can be automatically switched on after any section of the 10kV bus loses a working power supply, a backup power supply is switched on, the power loss of a user is avoided, and the operation requirement of power supply reliability is met. However, during investment and construction of the transformer substation, most transformer substations adopt a staged construction mode, only two main transformers are put into operation at the first stage (one of the main transformers becomes a single branch, the other main transformer becomes a double branch), a bus ii AM and a bus ii BM which supply 10kV through the double branch second main transformer are communicated to a bus ii M, the 10kV bus forms a connection mode of a single-bus single-section two-section bus and one of the buses is a double branch incoming line as shown in fig. 2 and 3, wherein fig. 2 shows a connection mode diagram of the 10kV bus in which the single-bus single-section two-section bus and one of the buses is the double branch incoming line when the first main transformer and the second main transformer are put into operation, and fig. 3 shows a connection mode diagram of the 10kV bus in which the single-bus single-section two-section bus and one of the bus is the double branch incoming line when the third main transformer and the second main transformer are put into operation. Taking fig. 2 as an example, if the second main transformer becomes the first branch switch 2DL and the second main transformer becomes the second branch switch 4DL to supply the bus ii M due to a defect, the conventional 10kV segmented backup power automatic switching device cannot realize the segmented backup power automatic switching function, and at this time, any one of the bus i M and the bus ii M loses the working power supply, which causes a power safety event that the 10kV bus is voltage-lost, and causes a large-area power failure in the power supply area. Taking fig. 3 as an example, if the second main transformer becomes the second branch switch 4DL and the second main transformer becomes the first branch switch 2DL to supply the bus ii M due to a defect, the conventional 10kV segmented backup power automatic switching device cannot realize the segmented backup power automatic switching function, and at this time, any one of the bus iii M and the bus ii M loses the working power supply, which causes a power safety event that the 10kV bus is voltage-lost, and causes a large-area power failure in the power supply area.

Chinese patent publication No. CN104467163A, published as 2015, 3, 25, discloses a method for implementing multi-power-supply-line segmented automatic backup power switching, which can automatically adjust the charge/discharge and outlet logics according to the operation mode of primary equipment, and particularly, when the incoming line is changed from a power-supply incoming line to a load line or from a load line to a power-supply incoming line, the corresponding automatic backup power switching logic can be started, so as to improve the reliability of the automatic backup power switching operation, and avoid the fixed operation mode of the existing automatic backup power switching technology during access, so that the automatic backup power switching cannot operate in some operation modes to cause a large-area power outage, but it is necessary to continuously determine whether the incoming line is active, and it is necessary to manually operate a working power supply, and the logic control is complex.

Disclosure of Invention

The invention provides a method for realizing the sectional spare power automatic switching, which is suitable for the change of a 10kV bus operation mode, and overcomes the defects and ensures the power supply reliability of a 10kV distribution network, in order to solve the problem that the conventional 10kV sectional spare power automatic switching technology cannot meet the requirement that the sectional spare power automatic switching function can be realized when a double-branch main transformer becomes low and any branch operates when the 10kV bus wiring mode is changed into a single-bus single-sectional two-section bus and one section of the bus is a double-branch incoming line wiring mode.

In order to achieve the technical effects, the technical scheme of the invention is as follows:

a method for realizing the sectionalized spare power automatic switching adapting to the change of a 10kV bus operation mode at least comprises the following steps:

s1, collecting a 10kV bus wiring mode and determining a main transformer to be put into operation;

s2, acquiring the switching value of the low-voltage main transformer, the switching value of the sectional switch, the bus voltage and the low-voltage current electrical quantity parameter of the low-voltage main transformer;

s3, judging whether the charging of the 10kV subsection spare power automatic switching device is finished or not, if so, executing a step S4; otherwise, not processing;

s4, judging whether the switching value of the main transformer becomes low, the switching value of the section switch, the bus voltage and the electric quantity parameter of the main transformer becomes low current of the operation to meet the operation condition of the section backup power automatic switching, if so, starting the delay fixed value time t1, then tripping off the main transformer becomes low, and executing the step S5; otherwise, the 10kV subsection spare power automatic switching does not act;

s5, judging the time t of the trip waiting delay of the low-level switch_dWhether a main transformer low-voltage switch corresponding to the voltage-loss bus is in a shunting position or not is judged, if yes, the section switch is closed after the closing delay time of the section switch is t2, and the 10kV section spare power automatic switching action is successful; otherwise, the 10kV subsection spare power automatic switching discharge fails.

The 10kV bus operation mode in the step S1 and the switching value parameters, the current and voltage electrical parameters in the step S2 are collected by a corresponding collection unit in the technical field, and whether the bus in the step S4 is under voltage loss is tested by a corresponding test unit in the technical field.

Preferably, the implementation method is applied to a sectional spare power automatic switching of a 10kV distribution network, as shown in fig. 1, the 10kV distribution network comprises a first main transformer, a second main transformer, a third main transformer, a bus im connected with the first main transformer step-down single branch a, a bus iiam connected with the second main transformer step-down first branch B, a bus iibm connected with the second main transformer step-down second branch C, and a bus iiim connected with the third main transformer step-down single branch D, a first sectional switch 3DL is connected in series between the bus im and the bus iiam, a second sectional switch 6DL is connected in series between the bus iibm and the bus iiim, and a switch 1DL is arranged on a line connecting the first main transformer step-down single branch a and the bus im; a switch 2DL is arranged on a circuit connecting the first branch B of the second main transformer with the bus II AM; a switch 4DL is arranged on a circuit connecting the second main transformer variable-low second branch C with the bus II BM; a switch 5DL is arranged on a circuit connecting the third main transformer variable-low single branch D with the bus IIIM, and I1-I4 represent current values collected by the current transformers; the 10kV bus wiring mode comprises a single-bus single-section two-section bus wiring mode and a single-bus double-section four-section bus wiring mode, wherein one section of the bus is a double-branch incoming line wiring mode.

Here, switch 1DL is used for controlling the break-make of the connecting line between first main transformer and low level single branch a and bus im, switch 2DL is used for controlling the break-make of the connecting line between second main transformer and low level first branch B and bus iiam, switch 4DL is used for controlling the break-make of the connecting line between second main transformer and low level second branch C and bus iibm, and switch 5DL is used for controlling the break-make of the connecting line between third main transformer and low level single branch D and bus iiim.

Preferably, when the 10kV bus connection mode is a single-bus single-section two-section bus connection mode, and one section of bus is a double-branch incoming line connection mode, a first main transformer is put into operation, a second main transformer is put into operation, a third main transformer is not put into operation, or the second main transformer is put into operation, the third main transformer is put into operation, and the first main transformer is not put into operation, and a bus II AM is communicated with a bus II BM to form a bus II M; when the 10kV bus connection mode is a single-bus double-section four-section bus connection mode, the first main transformer, the second main transformer and the third main transformer are all put into operation, and the bus II AM is not communicated with the bus II BM.

When the 10kV bus connection mode is a single-bus single-section two-section bus connection mode, and one section of bus is a double-branch incoming line connection mode, namely when only two main transformers are put into operation at the first stage of transformer substation construction; when the 10kV bus connection mode is a single-bus double-section four-section bus connection mode, namely when three main transformers are all put into operation in the corresponding transformer substation construction final stage.

Preferably, the 10kV bus connection mode is switched by one of control word switching, hard pressing plate switching, soft pressing plate switching or operation handle switching.

Preferably, the acquired parameters of step S2 include:

when the 10kV bus wiring mode is a single-bus single-section two-section bus wiring mode, and one section of bus is a double-branch incoming line wiring mode, the collected parameters are as follows: the switch position, the closed position (or the hand-jump signal) and the switching value of a backup protection action locking signal of the switch 1DL or the switch 5 DL; the switch position switching amount of the first section switch 3DL or the switch position switching amount of the second section switch 6 DL; the switch positions, the closed positions (or hand-jumping signals) of the switch 2DL and the switch 4DL, and the switching values of the backup protection locking signals; the voltage of the bus IIM; the voltage of the bus I M or the bus III M; current of switch 1DL or switch 5 DL; switch 2DL and switch 4 DL.

When the 10kV bus connection mode is a single-bus double-section four-section bus connection mode, the collected parameters are as follows: the switching position switching amount of the first section switch 3DL and the switching position switching amount of the second section switch 6 DL; the switch positions of the switch 1DL and the switch 5DL, the closed position (or a hand-jump signal), and the switching value of a backup protection action locking signal; current of switch 1DL and switch 5 DL; the switch positions, the closed positions (or hand-jumping signals) of the switch 2DL and the switch 4DL, and the switching values of the backup protection locking signals; current of switch 2DL and switch 4 DL; the voltage of the buses IIAM and IIBM; bus im and bus iiim.

Preferably, the criteria for completing the charging of the segment backup power automatic switching device in step S3 are: the sectional spare power automatic switching meets all charging conditions and finishes charging after charging delay fixed value time t 0;

the charging conditions include: A. the hard pressing plate with the segmented spare power automatic switching function is switched; B. the soft pressing plate with the segmented spare power automatic switching function is switched in; C. controlling character input by a sectional spare power automatic switching mode; D. the switch position of the section switch is a position division; E. the three-phase voltage of two sections of buses connected with the section switch in series is more than or equal to a bus voltage fixed value Uy;

the conditions of the sectional spare power automatic switching discharge are as follows: A. withdrawing the sectional spare power automatic switching function soft pressing plate or the sectional spare power automatic switching function hard pressing plate; B. the switch position of the sectional switch is closed, and the discharging delay fixed value time t4 is passed; C. when the sectional spare power automatic switching device is not started, the position signal of the low-level switch after being switched is from 1 → 0 or the hand jump signal is from 0 → 1; D. when the sectional spare power automatic switching device is not started, a low-change switch backup protection action blocking signal is from 0 → 1; E. receiving other external blocking signals; F. any one section of bus in the two sections of buses connected with the section switch in series generates PT three-phase disconnection; G. PT (potential transformer) disconnection occurs in two sections of buses connected with the section switch in series; when any one of the conditions of the sectional spare power automatic switching discharge is met, the sectional spare power automatic switching discharge is carried out.

Here, when the above charging conditions are all satisfied, it can be further determined whether charging is completed, and the two segments of buses connected in series with the sectionalizing switch refer to: when the 10kV bus wiring mode is a single-bus single-section two-section bus wiring mode, one section of bus is a double-branch incoming line wiring mode, a first main transformer and a second main transformer are put into operation, and a third main transformer is not put into operation, a bus I M and a bus II M; when the 10kV bus wiring mode is a single-bus single-section two-section bus wiring mode, one section of bus is a double-branch incoming line wiring mode, the second main transformer and the third main transformer are put into operation, and the first main transformer is not put into operation, the bus II M and the bus III M; when the 10kV bus connection mode is a single-bus double-section four-section bus connection mode and the first main transformer, the second main transformer and the third main transformer are all put into operation, the bus I M, the bus II AM, the bus II BM and the bus III M are connected in series.

Preferably, when the 10kV bus connection mode is a single-bus single-segment two-section bus and one of the buses is a double-branch incoming line connection mode, the first main transformer and the second main transformer are put into operation, the third main transformer is not put into operation, the segment backup power automatic switching completes charging, and the segment backup power automatic switching action condition and the action logic include:

under the operation mode that at least one of the switch 1DL is in the on-position state, the switch 2DL and the switch 4DL is in the operation state and the sectional switch 3DL is in the off-position state, if the conditions that the three-phase voltage of a bus I M is smaller than a non-voltage fixed value Uw and the current of the switch 1DL is smaller than a non-current fixed value Iw are simultaneously met, the first main transformer low-voltage switch 1DL is jumped after the 10kV sectional backup power automatic switching is started for a delay fixed value time t1, and if the delay fixed value time t is waited for the tripping of the low-voltage switch_dWhen the internal switch 1DL is in the open position, the first section switch 3 is switched on after the section switch is switched on for a certain time t2DL, the segmented spare power automatic switching action is successful; if the time t is delayed when the low-level switch is tripped_dAnd if the rear switch 1DL is still in the closed position, the sectional backup power automatic switching device discharges and returns, and the sectional backup power automatic switching device fails to operate.

Under the operation mode of 'switch 1DL is in on position, switch 2DL is in operation state, switch 4DL is in maintenance state and sectional switch 3DL is in off position', if the conditions that 'the three-phase voltage of a bus IIM is less than a non-voltage fixed value Uw, the current of switch 2DL is less than a non-current fixed value Iw and switch 4DL is in maintenance state' are met at the same time; then the 10kV subsection spare power automatic switching jumps to the first branch switch 2DL of the second main transformer after the starting delay fixed value time t1, and if the tripping of the low-transformer switch waits for the delay fixed value time t_dWhen the inner switch 2DL is in the off position, the first section switch 3DL is switched on after the section switch is switched on for a delay fixed value time t2, and the section backup power automatic switching action is successful; if the time t is delayed when the low-level switch is tripped_dAnd if the rear switch 2DL is still in the closed position, the sectional backup power automatic switching device discharges and returns, and the sectional backup power automatic switching device fails to operate.

Under the operation mode of 'switch 1DL is in on position, switch 2DL is in maintenance state, switch 4DL is in operation state, and section switch 3DL is in off position', if the conditions that 'the three-phase voltage of the bus IIM is less than the non-voltage fixed value Uw, the current of the switch 4DL is less than the non-current fixed value Iw and the switch 2DL is in maintenance state' are met at the same time; then the second main transformer becomes the second branch switch 4DL after the 10kV subsection backup power automatic switching is started for the delay fixed value time t1, and if the step-down switch is tripped for the delay fixed value time t_dWhen the inner switch 4DL is in the off position, the first section switch 3DL is switched on after the section switch is switched on for a delay fixed value time t2, and the section backup power automatic switching action is successful; if the time t is delayed when the low-level switch is tripped_dIf the rear switch 4DL is still in the on position, the sectional backup power automatic switching device discharges and returns, and the sectional backup power automatic switching device fails to operate.

Under the operation mode of ' switch 1DL is in on position, switch 2DL is in operation state, switch 4DL is in operation state and sectional switch 3DL is in off position ', if the conditions that the three-phase voltage of a bus IIM is less than a non-voltage fixed value Uw, the current of the switch 2DL is less than a non-current fixed value Iw and the current of the switch 4DL is less than the non-current fixed value Iw ' are met at the same time; thenThe second main transformer becomes the first branch switch 2DL and the second branch switch 4DL after the 10kV subsection spare power automatic switching is started for the delay fixed value time t1, and if the step-down switch is tripped for the delay fixed value time t_dWhen the inner switch 2DL and the switch 4DL are in the off position, the first section switch 3DL is switched on after the section switch switching-on delay fixed value time t2, and the section backup power automatic switching action is successful; if the time t is delayed when the low-level switch is tripped_dAnd if any one of the rear switch 2DL and the switch 4DL is still in the on position, the sectional backup power automatic switching device discharges and returns, and the sectional backup power automatic switching device fails to operate.

Under the operation mode that the switch 1DL is in the on-position state, the switch 2DL is in the operation state, the switch 4DL is in the hot standby state and the sectional switch 3DL is in the off-position state, if the conditions that the three-phase voltage of the bus IIM is smaller than the non-voltage fixed value Uw, the current of the switch 2DL is smaller than the non-current fixed value Iw and the switch 4DL is in the hot standby state are met at the same time; then the 10kV subsection spare power automatic switching jumps after the starting delay fixed value time t1 to the second main transformer to become the first branch switch 2DL and the second branch switch 4DL, if the tripping of the low transformer switches waits for the delay fixed value time t_dWhen the inner switch 2DL and the switch 4DL are in the off position, the first section switch 3DL is switched on after the section switch switching-on delay fixed value time t2, and the section backup power automatic switching action is successful; if the time t is delayed when the low-level switch is tripped_dAnd if any one of the rear switch 2DL and the switch 4DL is still in the on position, the sectional backup power automatic switching device discharges and returns, and the sectional backup power automatic switching device fails to operate.

Under the operation mode of ' switch 1DL is in on position, switch 2DL is in hot standby state, switch 4DL is in operation state, and segmented switch 3DL is in off position ', if the conditions that the three-phase voltage of a bus IIM is less than a non-voltage fixed value Uw, the current of switch 2DL is in hot standby state and the current of switch 4DL is less than a non-current fixed value Iw ' are met at the same time; then the 10kV subsection spare power automatic switching jumps after the starting delay fixed value time t1 to the second main transformer to become the first branch switch 2DL and the second branch switch 4DL, if the tripping of the low transformer switches waits for the delay fixed value time t_dWhen the inner switch 2DL and the switch 4DL are in the off position, the first section switch 3DL is switched on after the section switch switching-on delay fixed value time t2, and the section backup power automatic switching action is successful; if the time t is delayed when the low-level switch is tripped_dAnd if any one of the rear switch 2DL and the switch 4DL is still in the on position, the sectional backup power automatic switching device discharges and returns, and the sectional backup power automatic switching device fails to operate.

Preferably, when the 10kV bus connection mode is a single-bus single-segment two-section bus and one of the buses is a double-branch incoming line connection mode, the second main transformer and the third main transformer are put into operation, the first main transformer is not put into operation, the segment backup power automatic switching completes charging, and the segment backup power automatic switching operation conditions and the operation logic are as follows:

under the operation mode that the switch 5DL is in the closed position, at least one switch of the switch 2DL and the switch 4DL is in the operation state and the sectional switch 6DL is in the separated position, if the conditions that the three-phase voltage of the bus IIIM is smaller than the non-voltage fixed value Uw and the current of the switch 5DL is smaller than the non-current fixed value Iw are met at the same time are met; then the third main transformer low-voltage switch 5DL is jumped after the 10kV subsection spare power automatic switching is started for the delay fixed value time t1, and if the low-voltage switch is tripped and waits for the delay fixed value time t_dWhen the internal switch 5DL is in the off position, the second section switch 6DL is switched on after the section switch is switched on for a delay fixed time t2, and the section backup power automatic switching action is successful; if the time t is delayed when the low-level switch is tripped_dAnd if the rear switch 5DL is still in the closed position, the sectional backup power automatic switching device discharges and returns, and the sectional backup power automatic switching device fails to operate.

Under the operation mode of ' the switch 5DL is in the on-position, the switch 2DL is in the operation state, the switch 4DL is in the maintenance state and the sectional switch 6DL is in the off-position ', if the conditions that the three-phase voltage of the bus IIM is smaller than the non-voltage fixed value Uw, the current of the switch 2DL is smaller than the non-current fixed value Iw and the switch 4DL is in the maintenance state ' are met at the same time; then the 10kV subsection spare power automatic switching jumps to the first branch switch 2DL of the second main transformer after the starting delay fixed value time t1, and if the tripping of the low-transformer switch waits for the delay fixed value time t_dWhen the internal switch 2DL is in the off position, the second section switch 6DL is switched on after the section switch is switched on for a delay fixed time t2, and the section backup power automatic switching action is successful; if the time t is delayed when the low-level switch is tripped_dAnd if the rear switch 2DL is still in the closed position, the sectional backup power automatic switching device discharges and returns, and the sectional backup power automatic switching device fails to operate.

When the switch 5DL is in the closed position, the switch 2DL is in the maintenance state, the switch 4DL is in the running state and the section switch6DL is in a position-division operation mode, if the conditions that the three-phase voltage of the bus IIM is smaller than a non-voltage fixed value Uw, the switch 2DL is in a maintenance state and the current of the switch 4DL is smaller than a non-current fixed value Iw are met at the same time are met; then the second main transformer becomes the second branch switch 4DL after the 10kV subsection backup power automatic switching is started for the delay fixed value time t1, and if the step-down switch is tripped for the delay fixed value time t_dWhen the internal switch 4DL is in the off position, the second section switch 6DL is switched on after the section switch is switched on for a delay fixed time t2, and the section backup power automatic switching action is successful; if the time t is delayed when the low-level switch is tripped_dIf the rear switch 4DL is still in the on position, the sectional backup power automatic switching device discharges and returns, and the sectional backup power automatic switching device fails to operate.

Under the operation mode of ' the switch 5DL is in the on-position, the switch 2DL is in the operation state, the switch 4DL is in the operation state and the sectional switch 6DL is in the off-position ', if the conditions that the three-phase voltage of the bus IIM is smaller than the no-voltage fixed value Uw, the current of the switch 2DL is smaller than the no-current fixed value Iw and the current of the switch 4DL is smaller than the no-current fixed value Iw ' are met at the same time; then the 10kV subsection spare power automatic switching jumps after the starting delay fixed value time t1 to the second main transformer to become the first branch switch 2DL and the second branch switch 4DL, if the tripping of the low transformer switches waits for the delay fixed value time t_dWhen the internal switch 2DL and the switch 4DL are in the off position, the second section switch 6DL is switched on after the section switch is switched on for a delay fixed value time t2, and the section backup power automatic switching action is successful; if the time t is delayed when the low-level switch is tripped_dAnd if any one of the rear switch 2DL and the switch 4DL is still in the on position, the sectional backup power automatic switching device discharges and returns, and the sectional backup power automatic switching device fails to operate.

Under the operation mode that the switch 5DL is in the on-position, the switch 2DL is in the operation state, the switch 4DL is in the hot standby state and the sectional switch 6DL is in the off-position, if the conditions that the three-phase voltage of the bus IIM is smaller than the non-voltage fixed value Uw, the current of the switch 2DL is smaller than the non-current fixed value Iw and the switch 4DL is in the hot standby state are met at the same time; then the 10kV subsection spare power automatic switching jumps after the starting delay fixed value time t1 to the second main transformer to become the first branch switch 2DL and the second branch switch 4DL, if the tripping of the low transformer switches waits for the delay fixed value time t_dWhen the inner switch 2DL and the switch 4DL are in the off position, the switch-on time is delayed and timed through the section switchAfter the value time t2, the second section switch 6DL is closed, and the section spare power automatic switching action is successful; if the time t is delayed when the low-level switch is tripped_dAnd if any one of the rear switch 2DL and the switch 4DL is still in the on position, the sectional backup power automatic switching device discharges and returns, and the sectional backup power automatic switching device fails to operate.

Under the operation mode of ' switch 5DL is on-position, switch 2DL is in hot standby state, switch 4DL is in running state, and sectionalized switch 6DL is in split position ', if the conditions that the three-phase voltage of the bus IIM is less than the non-voltage fixed value Uw, the switch 2DL is in hot standby state, and the current of the switch 4DL is less than the non-current fixed value Iw ' are met at the same time; then the 10kV subsection spare power automatic switching jumps after the starting delay fixed value time t1 to the second main transformer to become the first branch switch 2DL and the second branch switch 4DL, if the tripping of the low transformer switches waits for the delay fixed value time t_dWhen the internal switch 2DL and the switch 4DL are in the off position, the second section switch 6DL is switched on after the section switch is switched on for a delay fixed value time t2, and the section backup power automatic switching action is successful; if the time t is delayed when the low-level switch is tripped_dAnd if any one of the rear switch 2DL and the switch 4DL is still in the on position, the sectional backup power automatic switching device discharges and returns, and the sectional backup power automatic switching device fails to operate. Preferably, when the 10kV bus connection mode is a single-bus double-section four-section bus connection mode, the first main transformer, the second main transformer and the third main transformer are all put into operation, the bus iiam is not communicated with the bus iibm, the sectional backup power automatic switching completes charging, and the sectional backup power automatic switching action conditions and the action logic include: the bus I M and the bus II AM are mutually dark standby spare power automatic switching devices, and the bus II BM and the bus III M are mutually dark standby spare power automatic switching devices.

When the first main transformer, the second main transformer and the third main transformer are all put into operation, the bus II AM is not communicated with the bus II BM, and the sectional spare power automatic switching technology can realize the sectional spare power automatic switching function.

Preferably, the switch in the operating state satisfies: when the maintenance pressing plate corresponding to the switch is in an exit state, the switch is in a closed position or the switch current is greater than or equal to a current constant value Iy;

the switch is in a hot standby state to meet the following conditions: the maintenance pressing plate corresponding to the switch is in an exit state, the switch is in a position division state, and the switch current is smaller than the no-current fixed value Iw;

the switch is in the maintenance state and satisfies: the maintenance pressing plate corresponding to the switch is in a putting-in state.

Compared with the prior art, the technical scheme of the invention has the beneficial effects that:

the invention provides a method for realizing the sectional spare power automatic switching adapting to the change of a 10kV bus operation mode, which determines a main transformer to be operated according to a 10kV bus wiring mode, collects related switching value and current and voltage electrical quantity parameters, realizes the 10kV sectional spare power automatic switching function by adapting to the change of the 10kV bus wiring mode and the change of the variable switching state of a double-branch main transformer, solves the problem that the prior 10kV sectional spare power automatic switching technology cannot meet the function of realizing the sectional spare power automatic switching function by the variable operation of any branch of the double-branch main transformer when the 10kV bus wiring mode is changed into a single-bus single-section two-section bus and one section of the bus is a double-branch incoming line wiring mode, meets the functional requirements of the 10kV bus on a 10kV sectional spare power automatic switching device by adopting a single-bus single-section two-section bus at the first stage and one section of the double-branch incoming line at the last stage and adopting a single-bus double-section four-section bus wiring mode at the last stage during the sectional spare power automatic switching device of a transformer substation, the sectional backup power automatic switching logic is simple and clear, and the reliable operation of a 10kV bus is guaranteed.

Drawings

FIG. 1 is a wiring structure diagram of the operation mode of a single-bus double-section four-section bus according to the present invention;

fig. 2 shows a single-bus single-section two-section bus of the transformer substation provided by the invention, which is only put into operation in the first stage of construction of the first main transformer and the second main transformer, wherein one section of the bus is a double-branch incoming line wiring mode structure diagram.

Fig. 3 shows a single-bus single-section two-section bus of the transformer substation provided by the invention, which is only put into operation in the first stage of construction of the second main transformer and the third main transformer, wherein one section of the bus is a double-branch incoming line wiring mode structure diagram.

Fig. 4 is a schematic flow chart of a method for implementing the sectionalized backup power automatic switching device which is adapted to the change of the 10kV bus operation mode and is proposed in the embodiment of the present invention.

Fig. 5 is a logic diagram of a sectional backup power automatic switching operation in a dual branch incoming line connection mode of a single bus, a single sectional two-section bus and a bus only running a first main transformer and a second main transformer according to an embodiment of the present invention.

Fig. 6 is a logic diagram of a sectional backup power automatic switching operation in a dual branch incoming line connection mode of a single bus single-section two-section bus only running a second main transformer and a third main transformer, which is proposed in the embodiment of the present invention.

Detailed Description

The drawings are for illustrative purposes only and are not to be construed as limiting the patent;

for better illustration of the present embodiment, certain parts of the drawings may be omitted, enlarged or reduced, and do not represent actual dimensions;

it will be understood by those skilled in the art that certain well-known descriptions of the figures may be omitted.

The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.

Example 1

As shown in fig. 4, the flow diagram of the implementation method of the sectionalized spare power automatic switching adapting to the change of the operation mode of the 10kV bus provided by the invention is applied to the sectionalized spare power automatic switching of a 10kV distribution network, the 10kV distribution network comprises a first main transformer, a second main transformer, a third main transformer, a bus im connected with a first main transformer low-changing single branch a, a bus iiam connected with a first main transformer low-changing branch B, a bus iibm connected with a second main transformer low-changing branch C, and a bus iiim connected with a third main transformer low-changing single branch D, a first sectionalizing switch 3DL is connected between the bus im and the bus iiam in series, a second sectionalizing switch 6DL is connected between the bus iibm and the bus iiim in series, and a switch 1DL is arranged on a line connecting the first main transformer low-changing single branch a and the bus im; a switch 2DL is arranged on a circuit connecting the first branch B of the second main transformer with the bus II AM; a switch 4DL is arranged on a circuit connecting the second main transformer variable-low second branch C with the bus II BM; a switch 5DL is arranged on a circuit connecting the third main transformer variable-low single branch D with the bus IIIM; the 10kV bus wiring mode comprises a single-bus single-section two-section bus wiring mode and a single-bus double-section four-section bus wiring mode, wherein one section of the bus is a double-branch incoming line wiring mode. The method comprises the following steps:

s1, collecting a 10kV bus wiring mode and determining a main transformer to be put into operation; when the 10kV bus connection mode is a single-bus single-section two-section bus connection mode, and one section of bus is a double-branch incoming line connection mode, a first main transformer is put into operation, a second main transformer is put into operation, a third main transformer is not put into operation or the second main transformer is put into operation, the third main transformer is put into operation, the first main transformer is not put into operation, a bus II AM and a bus II BM are communicated to form a bus II M, and the method corresponds to the time when only two main transformers are put into operation at the first stage of transformer substation construction; when the 10kV bus connection mode is a single-bus double-section four-section bus connection mode, the first main transformer, the second main transformer and the third main transformer are all put into operation, and the bus II AM and the bus II BM are not communicated and correspond to the time when the three main transformers are all put into operation in the final construction period of the transformer substation; the 10kV bus wiring mode is switched by one of the modes of controlling character input and output, hard pressing plate input and output, soft pressing plate input and output or operating handle switching.

S2, acquiring the switching value of the low-voltage main transformer, the switching value of a section switch, the bus voltage and the low-voltage current electrical quantity parameter of the main transformer in operation; the collected parameters of step S2 include:

S3, judging whether charging of the sectional spare power automatic switching device in the 10kV bus connection mode is completed or not, if so, executing a step S4; otherwise, not processing; the standard for completing the charging of the sectional spare power automatic switching device is as follows: the sectional spare power automatic switching meets all charging conditions and finishes charging after charging delay fixed value time t 0;

the charging conditions are as follows: A. the hard pressing plate with the segmented spare power automatic switching function is switched; B. the soft pressing plate with the segmented spare power automatic switching function is switched in; C. controlling character input by a sectional spare power automatic switching mode; D. the switch position of the section switch is a position division; E. and the three-phase voltage of two sections of buses connected with the section switch in series is more than or equal to the fixed voltage Uy of the buses. When the charging conditions are all satisfied, whether charging is completed or not can be further judged.

S4, judging whether the switching value of the main transformer becomes low, the switching value of the section switch, the bus voltage and the electric quantity parameter of the main transformer becomes low current of the operation to meet the operation condition of the section backup power automatic switching, if so, starting the delay fixed value time t1, then tripping off the main transformer becomes low, and executing the step S5; otherwise, the sectional spare power automatic switching device does not act in the 10kV bus connection mode;

s5, judging the time t of the trip waiting delay of the low-level switch_dIf the main transformer low-voltage switch corresponding to the voltage-loss bus is in the off position, the section switch is closed after the closing delay time of the section switch is t2, and the section spare power automatic switching action in the 10kV bus connection mode is successful; otherwise, the sectional spare power automatic switching device discharges, and the sectional spare power automatic switching device fails to operate in a 10kV bus connection mode. The conditions of the sectional spare power automatic switching discharge are as follows: A. withdrawing the sectional spare power automatic switching function soft pressing plate or the sectional spare power automatic switching function hard pressing plate; B. the switch position of the sectional switch is closed, and the discharging delay fixed value time t4 is passed; C. when the sectional spare power automatic switching device is not started, the position signal of the low-level switch after being switched is from 1 → 0 or the hand jump signal is from 0 → 1; D. when the sectional spare power automatic switching device is not started, a low-change switch backup protection action blocking signal is from 0 → 1; E. receiving other external blocking signals; F. two-section bus serially connected with section switchAny section of bus in the line has PT three-phase disconnection; G. PT (potential transformer) disconnection occurs in two sections of buses connected with the section switch in series; when any one of the conditions of the sectional spare power automatic switching discharge is met, the sectional spare power automatic switching discharge is carried out.

In this embodiment, referring to fig. 5, a logic diagram of a sectional backup power automatic switching operation in a dual branch incoming line operation mode of a single bus single-section two-section bus only running a first main transformer and a second main transformer is shown, that is:

when the 10kV bus connection mode is a single bus single-section two-section bus and one section of the bus is a double branch incoming line connection mode, as shown in fig. 2, the first main transformer and the second main transformer are in operation, and the third main transformer is not in operation. Referring to fig. 5, the charging is completed by the segment backup power automatic switching, and the operating conditions and the operating logic of the segment backup power automatic switching are as follows:

under the operation mode that at least one of the switch 1DL is in the on-position state, the switch 2DL and the switch 4DL is in the operation state and the sectional switch 3DL is in the off-position state, if the conditions that the three-phase voltage of a bus I M is smaller than a non-voltage fixed value Uw and the current of the switch 1DL is smaller than a non-current fixed value Iw are simultaneously met, the first main transformer low-voltage switch 1DL is jumped after the 10kV sectional backup power automatic switching is started for a delay fixed value time t1, and if the delay fixed value time t is waited for the tripping of the low-voltage switch_dWhen the internal switch 1DL is in the open position, the first section switch 3DL is switched on after the section switch is switched on for a delay fixed value time t2, and the section backup power automatic switching action is successful; if the time t is delayed when the low-level switch is tripped_dAnd if the rear switch 1DL is still in the closed position, the sectional backup power automatic switching device discharges and returns, and the sectional backup power automatic switching device fails to operate.

Under the operation mode of 'switch 1DL is in on position, switch 2DL is in operation state, switch 4DL is in maintenance state and sectional switch 3DL is in off position', if the conditions that 'the three-phase voltage of a bus IIM is less than a non-voltage fixed value Uw, the current of switch 2DL is less than a non-current fixed value Iw and switch 4DL is in maintenance state' are met at the same time; then the 10kV subsection spare power automatic switching jumps to the first branch switch 2DL of the second main transformer after the starting delay fixed value time t1, and if the tripping of the low-transformer switch waits for the delay fixed value time t_dWhen the internal switch 2DL is in the open position, the first subsection is closed after the closing delay time of the subsection switch is set to be a fixed value t2The switch 3DL is switched on and off, and the sectional spare power automatic switching action is successful; if the time t is delayed when the low-level switch is tripped_dAnd if the rear switch 2DL is still in the closed position, the sectional backup power automatic switching device discharges and returns, and the sectional backup power automatic switching device fails to operate.

Under the operation mode of ' switch 1DL is in on position, switch 2DL is in operation state, switch 4DL is in operation state and sectional switch 3DL is in off position ', if the conditions that the three-phase voltage of a bus IIM is less than a non-voltage fixed value Uw, the current of the switch 2DL is less than a non-current fixed value Iw and the current of the switch 4DL is less than the non-current fixed value Iw ' are met at the same time; then the 10kV subsection spare power automatic switching jumps after the starting delay fixed value time t1 to the second main transformer to become the first branch switch 2DL and the second branch switch 4DL, if the tripping of the low transformer switches waits for the delay fixed value time t_dWhen the inner switch 2DL and the switch 4DL are in the off position, the first section switch 3DL is switched on after the section switch switching-on delay fixed value time t2, and the section backup power automatic switching action is successful; if the time t is delayed when the low-level switch is tripped_dAnd if any one of the rear switch 2DL and the switch 4DL is still in the on position, the sectional backup power automatic switching device discharges and returns, and the sectional backup power automatic switching device fails to operate.

Under the operation mode of 'switch 1DL is in on position, switch 2DL is in operation state, switch 4DL is in hot standby state and sectional switch 3DL is in off position', if the conditions that 'the three-phase voltage of the bus IIM is less than the non-voltage fixed value Uw and the switches are simultaneously satisfied', the bus IIM is switched onThe current of 2DL is less than the no-current constant value Iw, and the switch 4DL is in the hot standby state' condition; then the 10kV subsection spare power automatic switching jumps after the starting delay fixed value time t1 to the second main transformer to become the first branch switch 2DL and the second branch switch 4DL, if the tripping of the low transformer switches waits for the delay fixed value time t_dWhen the inner switch 2DL and the switch 4DL are in the off position, the first section switch 3DL is switched on after the section switch switching-on delay fixed value time t2, and the section backup power automatic switching action is successful; if the time t is delayed when the low-level switch is tripped_dAnd if any one of the rear switch 2DL and the switch 4DL is still in the on position, the sectional backup power automatic switching device discharges and returns, and the sectional backup power automatic switching device fails to operate.

Under the operation mode of ' switch 1DL is in on position, switch 2DL is in hot standby state, switch 4DL is in operation state, and segmented switch 3DL is in off position ', if the conditions that the three-phase voltage of a bus IIM is less than a non-voltage fixed value Uw, the current of switch 2DL is in hot standby state and the current of switch 4DL is less than a non-current fixed value Iw ' are met at the same time; then the 10kV subsection spare power automatic switching jumps after the starting delay fixed value time t1 to the second main transformer to become the first branch switch 2DL and the second branch switch 4DL, if the tripping of the low transformer switches waits for the delay fixed value time t_dWhen the inner switch 2DL and the switch 4DL are in the off position, the first section switch 3DL is switched on after the section switch switching-on delay fixed value time t2, and the section backup power automatic switching action is successful; if the time t is delayed when the low-level switch is tripped_dAnd if any one of the rear switch 2DL and the switch 4DL is still in the on position, the sectional backup power automatic switching device discharges and returns, and the sectional backup power automatic switching device fails to operate. Referring to fig. 6, a schematic diagram of a sectional backup power automatic switching operation logic when only a single bus of the second main transformer and a single sectional two-section bus of the third main transformer are operated and one section of the bus is in a double-branch incoming line operation mode is shown, when a 10kV bus connection mode is the single bus of the single sectional two-section bus and one section of the bus is in the double-branch incoming line connection mode, referring to fig. 3, the second main transformer and the third main transformer are operated, the first main transformer is not operated, the sectional backup power automatic switching operation is completed, and the sectional backup power automatic switching operation conditions and the operation logic are as follows:

under the operation mode of 'switch 5DL is on, at least one switch of switch 2DL and switch 4DL is in operation state, and segmented switch 6DL is in off position', if the sameThe conditions that the three-phase voltage of the bus IIIM is smaller than a non-voltage fixed value Uw and the current of the switch 5DL is smaller than a non-current fixed value Iw are met; then the third main transformer low-voltage switch 5DL is jumped after the 10kV subsection spare power automatic switching is started for the delay fixed value time t1, and if the low-voltage switch is tripped and waits for the delay fixed value time t_dWhen the internal switch 5DL is in the off position, the second section switch 6DL is switched on after the section switch is switched on for a delay fixed time t2, and the section backup power automatic switching action is successful; if the time t is delayed when the low-level switch is tripped_dAnd if the rear switch 5DL is still in the closed position, the sectional backup power automatic switching device discharges and returns, and the sectional backup power automatic switching device fails to operate.

Under the operation mode of ' switch 5DL is on, switch 2DL is in maintenance state, switch 4DL is in operation state, and sectionalized switch 6DL is in split position ', if the conditions that the three-phase voltage of the bus IIM is less than the non-voltage fixed value Uw, the switch 2DL is in maintenance state, and the current of the switch 4DL is less than the non-current fixed value Iw ' are met at the same time; then the second main transformer becomes the second branch switch 4DL after the 10kV subsection backup power automatic switching is started for the delay fixed value time t1, and if the step-down switch is tripped for the delay fixed value time t_dWhen the internal switch 4DL is in the off position, the second section switch 6DL is switched on after the section switch is switched on for a delay fixed time t2, and the section backup power automatic switching action is successful; if the time t is delayed when the low-level switch is tripped_dWhen the rear switch 4DL is still in the closed position, the sectionalized backup power automatic switching discharges and returns, and sectionalizedThe backup automatic switching action fails.

Under the operation mode that the switch 5DL is in the on-position, the switch 2DL is in the operation state, the switch 4DL is in the hot standby state and the sectional switch 6DL is in the off-position, if the conditions that the three-phase voltage of the bus IIM is smaller than the non-voltage fixed value Uw, the current of the switch 2DL is smaller than the non-current fixed value Iw and the switch 4DL is in the hot standby state are met at the same time; then the 10kV subsection spare power automatic switching jumps after the starting delay fixed value time t1 to the second main transformer to become the first branch switch 2DL and the second branch switch 4DL, if the tripping of the low transformer switches waits for the delay fixed value time t_dWhen the internal switch 2DL and the switch 4DL are in the off position, the second section switch 6DL is switched on after the section switch is switched on for a delay fixed value time t2, and the section backup power automatic switching action is successful; if the time t is delayed when the low-level switch is tripped_dAnd if any one of the rear switch 2DL and the switch 4DL is still in the on position, the sectional backup power automatic switching device discharges and returns, and the sectional backup power automatic switching device fails to operate.

Under the operation mode of ' switch 5DL is on-position, switch 2DL is in hot standby state, switch 4DL is in running state, and sectionalized switch 6DL is in split position ', if the conditions that the three-phase voltage of the bus IIM is less than the non-voltage fixed value Uw, the switch 2DL is in hot standby state, and the current of the switch 4DL is less than the non-current fixed value Iw ' are met at the same time; then 10kV subsection spare power automatic switching warp starting delayJumping the second main transformer after a time constant t1 to lower the first branch switch 2DL and the second branch switch 4DL, and waiting for a time constant t when the lower switch is tripped_dWhen the internal switch 2DL and the switch 4DL are in the off position, the second section switch 6DL is switched on after the section switch is switched on for a delay fixed value time t2, and the section backup power automatic switching action is successful; if the time t is delayed when the low-level switch is tripped_dAnd if any one of the rear switch 2DL and the switch 4DL is still in the on position, the sectional backup power automatic switching device discharges and returns, and the sectional backup power automatic switching device fails to operate.

Above, the switch is in the operating state and satisfies: when the maintenance pressing plate corresponding to the switch is in an exit state, the switch is in a closed position or the switch current is greater than or equal to a current constant value Iy;

When the 10kV bus connection mode is a single-bus double-section four-section bus connection mode, a first main transformer, a second main transformer and a third main transformer are all put into operation, a bus II AM and a bus II BM are not communicated, the sectional spare power automatic switching is used for completing charging, the bus I M and the bus II AM are mutually dark spare power automatic switching, the bus II BM and the bus III M are mutually dark spare power automatic switching, and at the moment, the conventional sectional spare power automatic switching technology can realize the sectional spare power automatic switching function.

The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent;

it should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A method for realizing the segmented spare power automatic switching adapting to the change of a 10kV bus operation mode is characterized by at least comprising the following steps:

s5, judging the time t of the trip waiting delay of the low-level switch_dWhether a main transformer low-voltage switch corresponding to the voltage-loss bus is in a shunting position or not is judged, if yes, the section switch is closed after the closing delay time of the section switch is t2, and the 10kV section spare power automatic switching action is successful; otherwise, the 10kV subsection spare power automatic switching discharge fails;

the implementation method is applied to the sectional spare power automatic switching of a 10kV distribution network, wherein the 10kV distribution network comprises a first main transformer, a second main transformer, a third main transformer, a bus I M connected with a first main transformer variable-low single branch A, a bus II AM connected with a second main transformer variable-low first branch B, a bus II BM connected with a second main transformer variable-low branch C, and a bus III M connected with a third main transformer variable-low single branch D, a first sectional switch 3DL is connected between the bus I M and the bus II AM in series, a second sectional switch 6DL is connected between the bus II BM and the bus III M in series, and a switch 1DL is arranged on a circuit connected with the bus I M and the first main transformer variable-low single branch A; a switch 2DL is arranged on a circuit connecting the first branch B of the second main transformer with the bus II AM; a switch 4DL is arranged on a circuit connecting the second main transformer variable-low second branch C with the bus II BM; a switch 5DL is arranged on a circuit connecting the third main transformer variable-low single branch D with the bus IIIM; the 10kV bus wiring mode comprises the following steps: the single-bus single-section two-section bus adopts a wiring mode of a double branch incoming line and a wiring mode of a single-bus double-section four-section bus;

when the 10kV bus connection mode is a single bus single-section two-section bus and one section of bus is a double branch incoming line connection mode, the first main transformer and the second main transformer are put into operation, the third main transformer is not put into operation, the sectional backup power automatic switching completes charging, and the sectional backup power automatic switching action conditions and the action logic of the steps S4 and S5 include:

under the operation mode that at least one of the switch 1DL is in the on-position state, the switch 2DL and the switch 4DL is in the operation state and the sectional switch 3DL is in the off-position state, if the conditions that the three-phase voltage of a bus I M is smaller than a non-voltage fixed value Uw and the current of the switch 1DL is smaller than a non-current fixed value Iw are simultaneously met, the first main transformer low-voltage switch 1DL is jumped after the 10kV sectional backup power automatic switching is started for a delay fixed value time t1, and if the delay fixed value time t is waited for the tripping of the low-voltage switch_dWhen the internal switch 1DL is in the open position, the first section switch 3DL is switched on after the section switch is switched on for a delay fixed value time t2, and the section backup power automatic switching action is successful; if the time t is delayed when the low-level switch is tripped_dWhen the rear switch 1DL is still in the closed position, the sectional backup power automatic switching device discharges and returns, and the sectional backup power automatic switching device fails to operate;

under the operation mode of 'switch 1DL is in on position, switch 2DL is in operation state, switch 4DL is in maintenance state and sectional switch 3DL is in off position', if the conditions that 'the three-phase voltage of a bus IIM is less than a non-voltage fixed value Uw, the current of switch 2DL is less than a non-current fixed value Iw and switch 4DL is in maintenance state' are met at the same time; then the 10kV subsection spare power automatic switching jumps to the first branch switch 2DL of the second main transformer after the starting delay fixed value time t1, and if the tripping of the low-transformer switch waits for the delay fixed value time t_dWhen the inner switch 2DL is in the off position, the first section switch 3DL is switched on after the section switch is switched on for a delay fixed value time t2, and the section backup power automatic switching action is successful; if the time t is delayed when the low-level switch is tripped_dWhen the rear switch 2DL is still in the closed position, the sectional backup power automatic switching device discharges and returns, and the sectional backup power automatic switching device fails to operate;

in the state that the switch 1DL is on and off2DL is in a maintenance state, 4DL is in an operation state, and 3DL is in a position division operation mode, if the conditions that three-phase voltage of a bus IIM is smaller than a non-voltage fixed value Uw, current of 4DL is smaller than a non-current fixed value Iw and 2DL is in a maintenance state are met at the same time; then the second main transformer becomes the second branch switch 4DL after the 10kV subsection backup power automatic switching is started for the delay fixed value time t1, and if the step-down switch is tripped for the delay fixed value time t_dWhen the inner switch 4DL is in the off position, the first section switch 3DL is switched on after the section switch is switched on for a delay fixed value time t2, and the section backup power automatic switching action is successful; if the time t is delayed when the low-level switch is tripped_dWhen the rear switch 4DL is still in the closed position, the sectional backup power automatic switching device discharges and returns, and the sectional backup power automatic switching device fails to operate;

under the operation mode of ' switch 1DL is in on position, switch 2DL is in operation state, switch 4DL is in operation state and sectional switch 3DL is in off position ', if the conditions that the three-phase voltage of a bus IIM is less than a non-voltage fixed value Uw, the current of the switch 2DL is less than a non-current fixed value Iw and the current of the switch 4DL is less than the non-current fixed value Iw ' are met at the same time; then the 10kV subsection spare power automatic switching jumps after the starting delay fixed value time t1 to the second main transformer to become the first branch switch 2DL and the second branch switch 4DL, if the tripping of the low transformer switches waits for the delay fixed value time t_dWhen the inner switch 2DL and the switch 4DL are in the off position, the first section switch 3DL is switched on after the section switch switching-on delay fixed value time t2, and the section backup power automatic switching action is successful; if the time t is delayed when the low-level switch is tripped_dIf any one of the rear switch 2DL and the switch 4DL is still in the on position, the sectional backup power automatic switching device discharges and returns, and the sectional backup power automatic switching device fails to operate;

under the operation mode that the switch 1DL is in the on-position state, the switch 2DL is in the operation state, the switch 4DL is in the hot standby state and the sectional switch 3DL is in the off-position state, if the conditions that the three-phase voltage of the bus IIM is smaller than the non-voltage fixed value Uw, the current of the switch 2DL is smaller than the non-current fixed value Iw and the switch 4DL is in the hot standby state are met at the same time; then the 10kV subsection spare power automatic switching jumps after the starting delay fixed value time t1 to the second main transformer to become the first branch switch 2DL and the second branch switch 4DL, if the tripping of the low transformer switches waits for the delay fixed value time t_dInternal switch 2DL and switchIf the switches 4DL are all in the off position, the first section switch 3DL is switched on after the section switch is switched on for a delay fixed value time t2, and the section backup power automatic switching action is successful; if the time t is delayed when the low-level switch is tripped_dIf any one of the rear switch 2DL and the switch 4DL is still in the on position, the sectional backup power automatic switching device discharges and returns, and the sectional backup power automatic switching device fails to operate;

2. The method for realizing the segmented spare power automatic switching adapting to the change of the operation mode of the 10kV bus according to claim 1, wherein when the connection mode of the 10kV bus is a single-bus single-segmented two-section bus and one section of the bus is a connection mode of a double branch incoming line, a first main transformer is switched on, a second main transformer is switched on, a third main transformer is not switched on or the second main transformer, the third main transformer is switched on, the first main transformer is not switched on, and a bus IIAM is communicated with a bus IIBM to form a bus IIM; when the 10kV bus connection mode is a single-bus double-section four-section bus connection mode, the first main transformer, the second main transformer and the third main transformer are all put into operation, and the bus II AM is not communicated with the bus II BM.

3. The method for realizing the sectionalized automatic power switch-on adaptive to the change of the 10kV bus operation mode according to claim 1 or 2, wherein the 10kV bus connection mode is switched by controlling one of a character switching mode, a hard pressure plate switching mode, a soft pressure plate switching mode or an operation handle switching mode.

4. The method for realizing the sectionalized automatic power switch-on adaptive to the change of the 10kV bus operation mode according to claim 3, wherein the acquired parameters in the step S2 comprise:

when the 10kV bus wiring mode is a single-bus single-section two-section bus wiring mode, and one section of bus is a double-branch incoming line wiring mode, the collected parameters are as follows: the switch position, the closed position or the hand jump signal of the switch 1DL or the switch 5DL, and the switching value of a backup protection action locking signal; the switch position switching amount of the first section switch 3DL or the switch position switching amount of the second section switch 6 DL; the switch positions, the closed positions or the hand jump signals of the switch 2DL and the switch 4DL, and the switching values of the backup protection action locking signals; the voltage of the bus IIM; the voltage of the bus I M or the bus III M; current of switch 1DL or switch 5 DL; current of switch 2DL and switch 4 DL;

when the 10kV bus connection mode is a single-bus double-section four-section bus connection mode, the collected parameters are as follows: the switching position switching amount of the first section switch 3DL and the switching position switching amount of the second section switch 6 DL; the switch positions, the closed positions or the hand jump signals of the switch 1DL and the switch 5DL, and the switching values of the backup protection action locking signals; current of switch 1DL and switch 5 DL; the switch positions, the closed positions or the hand jump signals of the switch 2DL and the switch 4DL, and the switching values of the backup protection action locking signals; current of switch 2DL and switch 4 DL; the voltage of the buses IIAM and IIBM; bus im and bus iiim.

5. The method for realizing the sectionalized automatic power switch adapted to the change of the operation mode of the 10kV bus according to claim 4, wherein the standard for completing the charging of the sectionalized automatic power switch in the step S3 is as follows: the sectional spare power automatic switching meets all charging conditions and finishes charging after charging delay fixed value time t 0;

6. The method for realizing the sectional backup power automatic switching adapting to the change of the operation mode of the 10kV bus according to claim 5, wherein when the connection mode of the 10kV bus is a single-bus single-sectional two-section bus and one section of the bus is a connection mode of a double branch incoming line, a second main transformer and a third main transformer are put into operation, a first main transformer is not put into operation, the sectional backup power automatic switching completes charging, and the operation conditions and the operation logic of the sectional backup power automatic switching comprise:

under the operation mode that at least one of the switch 5DL is in an on-position state, the switch 2DL and the switch 4DL is in an operation state and the sectional switch 6DL is in an off-position state, if the conditions that the three-phase voltage of a bus III M is smaller than a non-voltage fixed value Uw and the current of the switch 5DL is smaller than a non-current fixed value Iw are met at the same time, the third main transformer low-voltage switch 5DL is jumped after the 10kV sectional backup power automatic switching is started for a delay fixed value time t1, and if the delay fixed value time t is waited for the tripping of the low-voltage switch_dWhen the internal switch 5DL is in the off position, the second section switch 6DL is switched on after the section switch is switched on for a delay fixed time t2, and the section backup power automatic switching action is successful; if the time t is delayed when the low-level switch is tripped_dWhen the rear switch 5DL is still in the closed position, the sectional backup power automatic switching device discharges and returns, and the sectional backup power automatic switching device fails to operate;

under the operation mode of 'switch 5DL is in on position, switch 2DL is in operation state, switch 4DL is in maintenance state and sectional switch 6DL is in off position', if the conditions that 'the three-phase voltage of a bus IIM is less than a non-voltage fixed value Uw, the current of the switch 2DL is less than a non-current fixed value Iw and the switch 4DL is in maintenance state' are met at the same time, the second main transformer becomes the first branch switch 2DL after the 10kV sectional spare power automatic switching is started for a delay fixed value time t1, and if the delay fixed value time t is waited for when the step-down switch is tripped, the step-down switch becomes the first branch switch 2DL_dWhen the internal switch 2DL is in the off position, the second section switch 6DL is switched on after the section switch is switched on for a delay fixed time t2, and the section backup power automatic switching action is successful; if the time t is delayed when the low-level switch is tripped_dWhen the rear switch 2DL is still in the closed position, the sectional backup power automatic switching device discharges and returns, and the sectional backup power automatic switching device fails to operate;

under the operation mode of ' switch 5DL is in on position, switch 2DL is in maintenance state, switch 4DL is in operation state and section switch 6DL is in off position ', if the conditions that ' the three-phase voltage of a bus IIM is less than a non-voltage fixed value Uw, the current of the switch 2DL is in maintenance state and the current of the switch 4DL is less than a non-current fixed value Iw ' are met at the same time ', the 10kV section spare power automatic switching jumps to the lower-voltage second branch switch 4DL after the starting delay fixed value time t1, and if the lower-voltage switch trips to wait the delay fixed value time t_dWhen the internal switch 4DL is in the off position, the second section switch 6DL is switched on after the section switch is switched on for a delay fixed time t2, and the section backup power automatic switching action is successful; if the time t is delayed when the low-level switch is tripped_dWhen the rear switch 4DL is still in the closed position, the sectional backup power automatic switching device discharges and returns, and the sectional backup power automatic switching device fails to operate;

under the operation mode of ' switch 5DL is in on position, switch 2DL is in operation state, switch 4DL is in operation state and section switch 6DL is in off position ', if the conditions that the three-phase voltage of a bus IIM is less than a non-voltage fixed value Uw, the current of the switch 2DL is less than a non-current fixed value Iw and the current of the switch 4DL is less than a non-current fixed value Iw ' are met at the same time, the 10kV section spare power automatic switching jumps after the starting delay fixed value time t1 to jump the first branch switch 2DL and the second branch switch 4DL of the second main transformer, and if the delay fixed value time t is waited for the tripping of the low-transformer switch_dThe internal switch 2DL and the switch 4DL are in the separated position, thenAfter the section switch closing delay fixed value time t2, the second section switch 6DL is closed, and the section backup power automatic switching action is successful; if the time t is delayed when the low-level switch is tripped_dIf any one of the rear switch 2DL and the switch 4DL is still in the on position, the sectional backup power automatic switching device discharges and returns, and the sectional backup power automatic switching device fails to operate;

under the operation mode of 'switch 5DL is on-position, switch 2DL is in operation state, switch 4DL is in hot standby state and sectional switch 6DL is in off-position', if the conditions of 'three-phase voltage of bus IIM is less than no-voltage fixed value Uw, current of switch 2DL is less than no-current fixed value Iw and switch 4DL is in hot standby state' are met at the same time, the 10kV sectional backup power automatic switching jumps after the starting delay fixed value time t1 to become the first main transformer and the second branch switch 2DL, and if the step-down switch trips to wait for the delay fixed value time t_dWhen the internal switch 2DL and the switch 4DL are in the off position, the second section switch 6DL is switched on after the section switch is switched on for a delay fixed value time t2, and the section backup power automatic switching action is successful; if the time t is delayed when the low-level switch is tripped_dIf any one of the rear switch 2DL and the switch 4DL is still in the on position, the sectional backup power automatic switching device discharges and returns, and the sectional backup power automatic switching device fails to operate;

under the operation mode of 'switch 5DL is on-position, switch 2DL is in hot standby state, switch 4DL is in operation state and sectional switch 6DL is in off-position', if the conditions that 'the three-phase voltage of bus IIM is less than non-voltage fixed value Uw, switch 2DL is in hot standby state and the current of switch 4DL is less than no-current fixed value Iw' are met at the same time, the 10kV sectional backup power automatic switching jumps after the starting delay fixed value time t1 to become the first main transformer and the second branch switch 2DL, and if the step-down switch trips to wait for the delay fixed value time t_dWhen the internal switch 2DL and the switch 4DL are in the off position, the second section switch 6DL is switched on after the section switch is switched on for a delay fixed value time t2, and the section backup power automatic switching action is successful; if the time t is delayed when the low-level switch is tripped_dAnd if any one of the rear switch 2DL and the switch 4DL is still in the on position, the sectional backup power automatic switching device discharges and returns, and the sectional backup power automatic switching device fails to operate.

7. The method for realizing the sectionalized automatic power switch-on suitable for the change of the operation mode of the 10kV bus according to claim 6, wherein when the connection mode of the 10kV bus is a connection mode of a single-bus double-sectionalized four-section bus, a first main transformer, a second main transformer and a third main transformer are all operated, a bus IIAM is not communicated with a bus II BM, and the sectionalized automatic power switch-on finishes charging, wherein the operation conditions and the operation logic of the sectionalized automatic power switch-on in the steps S4 and S5 comprise: the bus I M and the bus II AM are mutually dark standby spare power automatic switching devices, and the bus II BM and the bus III M are mutually dark standby spare power automatic switching devices.

8. The method for realizing the sectionalized automatic bus transfer adapting to the change of the 10kV bus operation mode according to claim 7, wherein when a switch is in an operation state, the conditions that: when the maintenance pressing plate corresponding to the switch is in an exit state, the switch is in a closed position or the switch current is greater than or equal to a current constant value Iy;