CN112072775B

CN112072775B - Single spare power automatic switching system adaptive to 10kV bus operation mode

Info

Publication number: CN112072775B
Application number: CN202010776746.7A
Authority: CN
Inventors: 李新海; 孟晨旭; 肖星; 范德和; 曾令诚; 周恒�; 曾庆祝; 凌霞; 梁景明; 罗海鑫; 卢泳茵
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: 2021-10-08
Anticipated expiration: 2040-08-05
Also published as: CN112072775A

Abstract

The invention provides a single spare power automatic switching system of a self-adaptive 10kV bus operation mode, which solves the problem that when a 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, the conventional spare power automatic switching device cannot meet the requirement that the spare power automatic switching function can be realized by the operation of any branch of a double-branch main transformer, the single spare power automatic switching system comprises a spare power automatic switching device, a mode switcher and a bus wiring mode instruction platform, the spare power automatic switching device realizes the spare power automatic switching function according to the collected electric quantity and the input quantity, the mode switcher receives instruction information of the change of the bus wiring mode transmitted by the bus wiring mode instruction platform, the spare power automatic switching device adopts a single design, the change of the self-adaptive bus operation mode controls the switching of two section switches and four main transformer switches, and can meet the requirement of the spare power automatic switching function when the single section switch operates or the double section switch operates, the power supply reliability of the 10kV bus is improved, and the cost is saved.

Description

Single spare power automatic switching system adaptive to 10kV bus operation mode

Technical Field

The invention relates to the technical field of 10kV bus spare power automatic switching self-adaptive switching, in particular to a single spare power automatic switching system self-adapting to a 10kV bus running mode.

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, a 10kV backup automatic switching device has a main transformer backup automatic switching function in which four sections of buses are mutually dark and three main transformers are mutually standby, and a 10kV backup switch can be automatically switched on after the 10kV bus loses a working power supply, a backup power supply is put into use, power loss of a user is avoided, and the requirement of power supply reliability operation is met. However, during the investment and construction of the transformer substation, most transformer substations adopt a staged construction mode, only two main transformers (one of the main transformers becomes a single branch, the other main transformer becomes a double branch) are put into operation at the first stage, the 10kV iiam bus and the iibm bus which are supplied with power by the double branch second main transformer are communicated into the iim bus, the 10kV bus forms a connection mode of "single bus single-section two-section bus and one of the buses is a double branch incoming line" as shown in fig. 2 and fig. 3, wherein fig. 2 shows a connection mode diagram of the 10kV bus in which "single bus single-section two-section bus and one of the buses is a double branch incoming line" when the first main transformer and the second main transformer are put into operation, fig. 3 shows a connection mode diagram of the 10kV bus in which "single bus single-section two-section bus and one of the buses is a double branch incoming line" when the third main transformer and the second main transformer are put into operation, and fig. 2 shows that if the second main transformer 2DL is out of operation due to a defect, the first branch switch is switched to a change from a second main transformer 4DL power supply During the IIM, the existing 10kV spare power automatic switching device cannot realize the spare power automatic switching function, and at the moment, the I M of the bus and the II M of the bus lose working power supplies, so that the power safety event of 10kV bus voltage loss is caused, and large-area power failure of a power supply area is caused. 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 existing 10kV backup power automatic switching device cannot realize the backup power automatic switching function, and at this time, the bus iii M and the bus ii M lose the working power supply, which causes a power safety event of voltage loss of the 10kV bus, and causes a large area power failure in the power supply area.

The Chinese patent with the publication number of CN109510193A and the publication number of 2019, 3 and 22 discloses a sectional spare power automatic switching device for a distribution network switching station and an operation method thereof, which ensure that the power supply reliability of the other section of bus is not influenced when any one section of two sections of buses with loads needs to be subjected to power failure maintenance during normal operation by adding a spare incoming line, improve the power supply reliability of the 10kV switching station and simplify the configuration of the spare power automatic switching device, but the technical scheme in the patent only considers the spare power automatic switching problem of a single-branch incoming line and outgoing line, needs to add a spare line, has the burden of increasing economic investment, and does not consider the problem of realizing the spare power automatic switching when the 10kV buses are built by stages, the first adopts a wiring mode of 'single-bus single-sectional two sections of buses and one section of buses is a double-branch incoming line' and the last adopts a wiring mode of 'single-bus double-sectional four-section buses', it is not favorable for ensuring the power supply reliability in such a case.

Disclosure of Invention

The invention provides a single-body type spare power automatic switching system with a self-adaptive 10kV bus operation mode, which aims to solve the problem that when the 10kV bus connection mode is changed into a single-bus single-section two-section bus and one section of the bus is a double-branch incoming line connection mode, the existing 10kV spare power automatic switching device cannot meet the requirement that the spare power automatic switching function can be realized when any branch of a double-branch main transformer is changed into a double-branch incoming line connection mode.

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

a single spare power automatic switching system adaptive to a 10kV bus running mode is applied to 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 single branch A, a bus II AM connected with a second main transformer variable first branch B, a bus II BM connected with a second main transformer variable second branch C, and a bus III M connected with a third main transformer variable single branch D, a first section switch 3DL is connected between the bus I M and the bus II AM in series, and a second section switch 6DL is connected between the bus II BM and the bus III M in series The main transformer spare power automatic switching device comprises a third main transformer and a second main transformer, wherein a single-branch acquisition end a is connected with a first main transformer single-branch low side and a third main transformer single-branch low side, a double-branch acquisition end b is connected with a second main transformer double-branch low side, a first section acquisition end c1 is connected with a first section switch 3DL, a second section acquisition end c2 is connected with a second section switch 6DL, a mode switcher is connected with a bus wiring mode instruction platform, receives instruction information of bus wiring mode change transmitted by the bus wiring mode instruction platform, switches a bus wiring mode of a 10kV distribution network, and the spare power automatic switching device adapts to the bus operation mode change, and controlling the switching-on and switching-off of the first section switch, the second section switch, the first main transformer single-branch low-side switch, the second main transformer double-branch low-side switch and the third main transformer single-branch low-side switch according to the operation condition and the operation mode of the field device.

Preferably, the mode switcher receives instruction information sent by the bus wiring mode instruction platform, and the switched 10kV distribution network bus wiring mode includes: the single-bus single-section two-section bus comprises a single bus and two sections of buses, wherein one section of bus is in a double-branch incoming line connection mode and a single-bus double-section four-section bus connection mode; when the wiring mode of the 10kV distribution network bus is a wiring mode of 'single-bus single-section two-section bus and one section of bus is a double-branch incoming line', a bus II AM is communicated with a bus II BM to be a bus II M, and a first main transformer and a second main transformer are put into operation, a third main transformer is not put into operation, or the third main transformer and the second main transformer are put into operation, and the first main transformer is not put into operation; when the wiring mode of the 10kV distribution network bus is a single-bus double-section four-section bus, 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.

Here, because the 10kV distribution network bus is in a wiring mode of "single-bus single-section two-section bus and one section of bus is a double-branch incoming line" during first-stage construction, when the bus wiring mode instruction platform sends instruction information of first-stage construction of the bus, the mode switcher receives the instruction information, in one case, two main transformers in operation are a first main transformer and a second main transformer, the third main transformer is not in operation, the first main transformer becomes a single-branch a connected with a bus im, the bus im is a single-branch incoming line, the second main transformer becomes a first branch B connected with a bus ii AM, the second main transformer becomes a second branch C connected with a bus ii BM, at this time, the bus ii AM is communicated with the bus ii BM to be a bus ii M, the bus ii M is a double-branch incoming line, and the spare power automatic switching device is used as a section spare power automatic switching of the first section switch 3DL and a spare power automatic switching of the first main transformer and the second main transformer is switched in; the other situation is that two main transformers in operation are a third main transformer and a second main transformer, the first main transformer is not in operation, a first branch B of a second main transformer variable-low is connected with a bus II AM, a second branch C of the second main transformer variable-low is connected with a bus II BM, the bus II AM is communicated with the bus II BM to form a bus II M, the bus II M is a double-branch incoming line, a single branch D of the third main transformer variable-low is connected with a bus III M, the bus III M is a single-branch incoming line, and a spare power automatic switching device is used as a subsection spare power automatic switching device of a second subsection switch 6DL and a main transformer spare power automatic switching device of the third main transformer and the second main transformer; the bus connection mode is a connection mode of a single-bus double-subsection four-section bus during the final-stage construction of a 10kV distribution network bus, when a bus connection mode command platform sends command information of the final-stage construction of the bus, a mode switcher receives the command information, three main transformers are all put into operation, a spare power automatic switching device is used as a subsection spare power automatic switching device of a first subsection switch 3DL, a subsection spare power automatic switching device of a second subsection switch 6DL, a main transformer spare power automatic switching device of the first main transformer and a second main transformer, and a main transformer spare power automatic switching device of a third main transformer and a second main transformer, the spare power automatic switching device is adaptive to the change of the operation mode of the bus according to the change of the 10kV bus connection mode, the phenomenon that the spare power automatic switching device can realize the spare power automatic switching function under the single-bus double-section four-section bus connection mode only by matching two main transformers is avoided, the technical matching complexity is reduced, and the cost is saved.

Preferably, a switch 1DL is further arranged on a line connecting the first main transformer low-changing single branch a and the bus im and used for controlling the connection and disconnection of the line connecting the first main transformer low-changing single branch a and the bus im; a switch 2DL is further arranged on a circuit connecting the first branch B of the second main transformer and the bus II AM and is used for controlling the connection and disconnection of the connecting circuit of the first branch B of the second main transformer and the bus II AM; a switch 4DL is further arranged on a line connecting the second branch C of the second main transformer with the bus II BM and is used for controlling the connection and disconnection of the connecting line between the second branch C of the second main transformer with the bus II BM; and a switch 5DL is further arranged on a circuit connecting the third main transformer variable-low single branch D and the bus III M and used for controlling the connection and disconnection of the connecting circuit connecting the third main transformer variable-low single branch D and the bus III M.

Preferably, the spare power automatic switching device comprises:

the alternating current module is used for collecting bus voltage, currents of the first main transformer low-changing single branch A and the third main transformer low-changing single branch D, and currents of the second main transformer low-changing first branch B and the second branch C;

the switch-in module is used for acquiring the switching values of the switch 1DL, the switch 5DL, the switch 2DL, the switch 4DL, the switch 3DL and the switch 6DL and the switching value of the mode switcher;

the switch-out module is used for tripping on the switch 1DL, the switch 5DL, the switch 2DL, the switch 4DL, the switch 3DL and the switch 6 DL;

the CPU processor receives and processes the information collected by the alternating current module and the switch-in module, drives the switch-out module to jump on the switch 1DL, the switch 5DL, the switch 2DL, the switch 4DL, the switch 3DL and the switch 6DL, and sends an action message and an abnormal alarm signal message;

the communication module is used for supporting the network communication between the CPU processor and the substation automation system and transmitting an action message and an abnormal alarm signal message sent by the CPU processor to the substation background monitoring system and the telecontrol communication system;

and the power supply module is respectively connected with the alternating current module, the communication module, the CPU processor, the opening module and the opening module, and converts the externally-accessed DC110V or DC220V working power supply voltage into the working power supply voltage required by the alternating current module, the communication module, the CPU processor, the opening module and the opening module.

When the 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, the alternating current module collects bus voltage, current of the first main transformer low single branch A or the third main transformer low single branch D, and current of the second main transformer low first branch B and the second branch C; when the bus connection mode is a single-bus double-section four-section bus connection mode, the alternating current module collects bus voltage, currents of the first main transformer low-changing single branch A and the third main transformer low-changing single branch D, and currents of the second main transformer low-changing first branch B and the second branch C; under two different 10kV bus wiring modes, when any branch of the double-branch main transformer becomes low, the spare power automatic switching system can acquire the current magnitude of the double-branch main transformer, so that the current magnitudes are used as the input of the spare power automatic switching system, and when any branch of the double-branch main transformer becomes low, the spare power automatic switching function can be realized by combining other matching conditions;

when the bus connection mode is 'single bus single-section two-section bus and one section of bus is a double-branch incoming line', the switching value of a switch 1DL or a switch 5DL, the switching value of a switch 2DL and a switch 4DL, and the switching value of a first section switch 3DL or a second section switch 6DL are acquired by an incoming module; if a first main transformer and a second main transformer are switched in, a switching-in module of the spare power automatic switching device acquires switching values such as a switching position, a closing position (or a hand-jumping signal) and a backup protection action locking signal of a switch 1DL on a connecting line of a first main transformer low-single branch A and a bus I M, switching values such as a switching position, a closing position (or a hand-jumping signal) and a backup protection action locking signal of a switch 2DL on a connecting line of a second main transformer low-first branch B and a bus II AM, switching values such as a switching position, a closing position (or a hand-jumping signal) and a backup protection action locking signal of a switch 4DL on a connecting line of a second main transformer low-second branch C and a bus II BM, switching values such as a switching position of a first section switch 3DL, a main transformer spare power automatic switching function pressing plate of the first main transformer and the second main transformer, a mode switching function pressing plate, a mode switching plate, Switch 2DL overhaul pressing plate, switch 4DL overhaul pressing plate, spare power automatic switching device overhaul pressing plate and other switch values; if a third main transformer and a second main transformer are put into operation, an opening module of the spare power automatic switching device acquires switching values such as a switching position, a closing position (or a hand-jumping signal) and a backup protection action locking signal of a switch 5DL on a connecting line of a single branch D of the third main transformer and a bus IIIM, switching values such as a switching position, a closing position (or a hand-jumping signal) and a backup protection action locking signal of a switch 2DL on a connecting line of a first branch B of the second main transformer and a bus IIAM, switching values such as a switching position, a closing position (or a hand-jumping signal) and a backup protection action locking signal of a switch 4DL on a connecting line of a second branch C of the second main transformer and a bus IIBM, switching values such as a switching position of a second section switch 6DL, a spare power automatic switching function pressing plate of the third main transformer and a second main transformer, a switching function pressing plate of a mode switcher, switching of the mode switcher, Switch 2DL overhaul pressing plate, switch 4DL overhaul pressing plate, spare power automatic switching device overhaul pressing plate and other switch values; when three main transformers are all put into operation, the bus connection mode is a connection mode of a single-bus double-subsection four-section bus, the switching values of a switch 1DL and a switch 5DL, the switching values of a switch 2DL and a switch 4DL and the switching values of a first subsection switch 3DL and a second subsection switch 6DL are collected by an access module; the switching-in module of the spare power automatic switching device collects switching quantities such as the switching position, the closing position (or hand-jumping signal) and the backup protection action locking signal of a switch 1DL on a connecting line of a first main transformer low-changing single branch A and a bus I M, the switching quantities such as the switching position, the closing position (or hand-jumping signal) and the backup protection action locking signal of a switch 2DL on a connecting line of a second main transformer low-changing first branch B and a bus II AM, the switching quantity of the switching position of a first section switch 3DL, the switching position, the closing position (or hand-jumping signal) and the backup protection action locking signal of a switch 5DL on a connecting line of a third main transformer low-changing single branch D and a bus III M, the switching quantities such as the switching position, the closing position (or hand-jumping signal) and the backup protection action locking signal of a switch 4DL on a connecting line of a second main transformer low-changing second branch C and a bus BM II, the switching value of the switching position of the second section switch 6DL, the switching values of the first section switch 3DL section spare power automatic switching function pressing plate, the main transformer spare power automatic switching function pressing plate of the first main transformer and the second main transformer, the second section switch 6DL section spare power automatic switching function pressing plate, the main transformer spare power automatic switching function pressing plate of the third main transformer and the second main transformer, the switching of the mode switcher, the switch 2DL overhaul pressing plate, the switch 4DL overhaul pressing plate, the spare power automatic switching device overhaul pressing plate and the like; by integrating the above collected input of the switching value and the current and voltage electrical quantity, when the double-branch main transformer becomes low and any branch runs, the spare power automatic switching system can realize the spare power automatic switching function.

When the bus connection mode is a single-bus single-section two-section bus connection mode, and one section of the bus is a double-branch incoming line connection mode, if two main transformers in operation are a first main transformer and a second main transformer, a switching-out module of the spare power automatic switching device can be used for switching out switching-out amounts of a first main transformer low-voltage switch 1DL, a second main transformer low-voltage switch 2DL, a second main transformer low-voltage switch 4DL, a first section switch 3DL and the like; if the two main transformers in operation are a third main transformer and a second main transformer, the switching-out module of the spare power automatic switching device can be used for switching out switching-out quantities of a tripping third main transformer low-voltage switch 5DL, a tripping second main transformer low-voltage switch 2DL, a tripping second main transformer low-voltage switch 4DL, a tripping second section switch 6DL and the like;

when three main transformers are put into operation and the bus connection mode is a single-bus double-subsection four-section bus connection mode, the spare power automatic switching device can open and close the switching-off quantities of a first main transformer low-voltage switch 1DL, a second main transformer low-voltage switch 2DL, a second main transformer low-voltage switch 4DL, a first subsection switch 3DL, a third main transformer low-voltage switch 5DL and a second subsection switch 6 DL.

Preferably, a logic judgment unit is arranged on the CPU processor, the logic judgment unit includes a segmented spare power automatic switching logic judgment unit and a main transformer spare power automatic switching logic judgment unit, the segmented spare power automatic switching logic judgment unit is used for completing logical judgment of segmented spare power automatic switching, the main transformer spare power automatic switching logic judgment unit is used for completing logical judgment of main transformer spare power automatic switching, and the segmented spare power automatic switching logic judgment unit and the main transformer spare power automatic switching logic judgment unit perform logical judgment on information acquired by the alternating current module and the switching-in module, and drive the switching-out module to trip-switch the switch 1DL, the switch 5DL, the switch 2DL, the switch 4DL, the switch 3DL and the switch 6 DL.

The CPU processor is provided with a sectional spare power automatic switching logic judgment unit and a main transformer spare power automatic switching logic judgment unit, the sectional spare power automatic switching logic judgment unit and the main transformer spare power automatic switching logic judgment unit are both provided with logic judgment programs, and the corresponding sectional spare power automatic switching logic judgment program and the main transformer spare power automatic switching logic judgment program are switched in according to the change of the 10kV bus operation mode; the logic judgment program of the subsection spare power automatic switching logic judgment unit refers to a logic judgment program of a first subsection switch 3DL subsection spare power automatic switching and a logic judgment program of a second subsection switch 6DL subsection spare power automatic switching, and the logic judgment program of the main transformer spare power automatic switching logic judgment unit refers to a main transformer spare power automatic switching logic program of a first main transformer and a second main transformer and a main transformer spare power automatic switching logic program of a third main transformer and the second main transformer; as shown in fig. 2, when the two main transformers are first main transformer and second main transformer, the 10kV bus im voltage, bus iim voltage, switch 1DL, switch 2DL, switch 4DL, and switch 3DL participate in the sectional backup power automatic switching of the first sectional switch 3DL and the main transformer backup power automatic switching logic judgment program of the first main transformer and second main transformer, as shown in fig. 3, when the two main transformers are third main transformer and second main transformer, the 10kV bus iiim voltage, bus iim voltage, switch 5DL, switch 2DL, switch 4DL, and switch 6DL participate in the sectional backup power automatic switching of the second sectional switch 6DL and the main transformer backup power automatic switching logic judgment program of the third main transformer and second main transformer, as shown in fig. 1, when the three main transformers are put into operation, the 10kV bus im voltage, bus iiam voltage, switch 1DL, switch 2DL, and switch 3DL participate in the sectional backup power automatic switching logic judgment program of the first sectional switch 3DL and the first main transformer and second main transformer, the 10kV bus IIIM voltage, the bus II BM voltage, the switch 5DL, the switch 4DL and the switch 6DL participate in a subsection spare power automatic switching of the second subsection switch 6DL and a main transformer spare power automatic switching logic judgment program of a third main transformer and a second main transformer; the spare power automatic switching logic judgment program of the spare power automatic switching device carries out self-adaptive logic judgment according to information acquired by the alternating current module and the switching-in module, and solves the problem that when the 10kV bus wiring mode is changed into a single-bus single-section two-section bus and one section of the bus is in a double-branch incoming line wiring mode, the existing 10kV spare power automatic switching device cannot meet the requirement that the spare power automatic switching function can be realized when any branch of a double-branch main transformer is changed into any branch of the double-branch main transformer.

The logic judgment program of the sectional spare power automatic switching logic unit comprises a first sectional switch 3DL sectional spare power automatic switching logic program and a second sectional switch 6DL sectional spare power automatic switching logic program; when the wiring mode of the 10kV bus is a 'single-bus single-section two-section bus and one section of bus is a double-branch incoming line' wiring mode, the bus II AM and the II BM bus are communicated to form a bus II M, when the first main transformer and the second main transformer are put into operation and the third main transformer is not put into operation, the first sectional switch 3DL sectional spare power automatic switching function pressing plate is switched on, the spare power automatic switching device collects the switch position of the sectional switch 3DL, the switch position, the closed position or the hand jump signal of the switch 1DL, the backup protection action locking signal switch quantity and the three-phase current, the switch position, the closed position or the hand jump signal of the switch 2DL, the backup protection action locking signal switch quantity and the three-phase current, the switch position, the closed position or the hand jump signal of the switch 4DL, the backup protection action locking signal switch quantity and the three-phase current, and executes a first sectional switch 3DL sectional spare power automatic switching logic program; when a third main transformer and a second main transformer are put into operation and a first main transformer is not put into operation, the second section switch 6DL section spare power automatic switching function pressing plate is put into operation, the spare power automatic switching device collects the switch position of the second section switch 6DL, the switch position, the closed position or the hand jump signal of the switch 5DL, the backup protection action locking signal switch quantity and the three-phase current, the switch position, the closed position or the hand jump signal of the switch 2DL, the backup protection action locking signal switch quantity and the three-phase current, the switch position, the closed position or the hand jump signal of the switch 4DL, the backup protection action locking signal switch quantity and the three-phase current, and the second section switch 6DL section spare power automatic switching logic program is executed.

When the wiring mode of a 10kV bus is a wiring mode of a single-bus double-subsection four-section bus, a first main transformer, a second main transformer and a third main transformer are all put into operation, a bus II AM is not communicated with a bus II BM, when a first subsection switch 3DL subsection automatic backup power switching function pressing plate is switched in, a spare automatic power switching device collects the switch position of a subsection switch 3DL, the switch position, the closed position or a hand trip signal of a switch 1DL, the switching quantity and the three-phase current of a backup protection action locking signal, the switch position, the closed position or the hand trip signal of a switch 2DL, the switching quantity and the three-phase current of the backup protection action locking signal, and executes a first subsection switch 3DL subsection automatic backup power switching logic program; when the second section switch 6DL section spare power automatic switching function pressing plate is switched in, the spare power automatic switching device collects the switch position of the second section switch 6DL, the switch position, the closed position or the hand trip signal of the switch 5DL, the backup protection action locking signal switch quantity and the three-phase current, the switch position, the closed position or the hand trip signal of the switch 4DL, the backup protection action locking signal switch quantity and the three-phase current, and executes the second section switch 6DL section spare power automatic switching logic program.

The logic judgment program of the main transformer spare power automatic switching logic unit comprises main transformer spare power automatic switching logic programs of a first main transformer and a second main transformer and main transformer spare power automatic switching logic programs of a third main transformer and the second main transformer; when the wiring mode of the 10kV bus is a 'single-bus single-section two-section bus and one section of bus is a double-branch incoming line' wiring mode, the bus II AM and the II BM bus are communicated to form a bus II M, when the first main transformer and the second main transformer are put into operation and the third main transformer is not put into operation, the spare power automatic switching function pressing plate of the first main transformer and the second main transformer is switched on, the spare power automatic switching device collects the switch position of a section switch 3DL, the switch position, the closed position or the hand trip signal of a switch 1DL, the backup protection action blocking signal switching value and the three-phase current, the switch position, the closed position or the hand trip signal of a switch 2DL, the backup protection action blocking signal switching value and the three-phase current, the switch position, the closed position or the hand trip signal of a switch 4DL, the backup protection action blocking signal switching value and the three-phase current, and a main transformer spare power automatic switching logic program of the first main transformer and the second main transformer is executed; when a third main transformer and a second main transformer are put into operation and a first main transformer is not put into operation, a main transformer automatic switching function pressing plate of the third main transformer and the second main transformer is put into operation, a standby automatic switching device collects the switch position of a second section switch 6DL, the switch position, the closed position or a hand trip signal of a switch 5DL, the backup protection action blocking signal switching value and three-phase current, the switch position, the closed position or the hand trip signal of a switch 2DL, the backup protection action blocking signal switching value and three-phase current, the switch position, the closed position or the hand trip signal of a switch 4DL, the backup protection action blocking signal switching value and three-phase current, and a main transformer automatic switching logic program of the third main transformer and the second main transformer is executed.

When the wiring mode of a 10kV bus is a wiring mode of a single-bus double-subsection four-section bus, a first main transformer, a second main transformer and a third main transformer are all put into operation, a bus IIAM is not communicated with a bus IIBM, when a main transformer automatic backup power switching function pressing plate of the first main transformer and the second main transformer is switched in, a backup automatic switching device collects the switch position of a subsection switch 3DL, the switch position, the switched-off position or a hand trip signal of a switch 1DL, the switching quantity and the three-phase current of a backup protection action locking signal, the switch position, the switched-off position or the hand trip signal of a switch 2DL, the switching quantity and the three-phase current of the backup protection action locking signal, and a main transformer automatic switching logic program of the first main transformer and the second main transformer is executed; when the main transformer automatic backup power switching function pressing plates of the third main transformer and the second main transformer are switched on, the automatic backup power switching device collects the switch position of the second section switch 6DL, the switch position, the closed position or the hand trip signal of the switch 5DL, the backup protection action locking signal switch quantity and the three-phase current, the switch position, the closed position or the hand trip signal of the switch 4DL, the backup protection action locking signal switch quantity and the three-phase current, and executes a main transformer automatic backup power switching logic program of the third main transformer and the second main transformer.

Through the cooperation, avoid present being equipped with the phenomenon that the device needs two cooperations just can realize the spare power automatic switching function under the two section four section generating lines wiring modes of single generating line to take place, when solving when 10kV generating line wiring mode change to "single generating line list segmentation two sections generating lines and one of them section generating line be two branch inlet wires" wiring mode, present being equipped with the problem that the device can not satisfy two branch owner and become arbitrary branch operation of step-down and all can realize the spare power automatic switching function.

Preferably, the switch-out module is connected with an external outlet relay and a signal relay, and when the CPU processor sends out instructions to trip-in switches 1DL, 5DL, 2DL, 4DL, 3DL and 6DL, the switch-out module drives the trip-in outlet relays of the corresponding switches 1DL, 5DL, 2DL, 4DL, 3DL and 6DL to operate; when the spare power automatic switching device acts, the CPU sends an action signal command, and then the output module drives the signal relay to act to send an action message; when the spare power automatic switching device is abnormal, the CPU sends an abnormal alarm signal command, and then the output module drives the signal relay to act and sends an abnormal alarm message.

Preferably, the backup power automatic switching device further comprises a management panel, the management panel is connected with the power module and supplies power through the power module, the management panel comprises a display and a human-computer input module, the display is respectively connected with the CPU processor and the human-computer input module and used for displaying information collected by the alternating current module and the switching-in module and a backup power automatic switching action report processed by the CPU processor, and the human-computer input module is connected with the display and used for a worker to check the device setting value, the parameter and the action report and input a printing instruction of the backup power automatic switching setting value, the setting value and the action report.

Preferably, the communication module supports the 61850/103 universal specification of the substation.

Preferably, the working power supply voltage of the alternating current module, the CPU processor, the communication module and the management panel is DC5V, the working power supply voltage of the input module and the output module is DC110V or DC220V, and when the switching value collected by the input module is positive DC110V or DC220V, the switching value is input.

Preferably, the mode switcher adopts one of control word switching, hard pressure plate switching, soft pressure plate switching or operating handle switching to switch a 10kV distribution network bus connection mode.

The mode switcher can adopt different switching modes to switch the bus connection mode of the 10kV distribution network, and after the mode switcher switches the bus connection mode of the 10kV distribution network, the spare power automatic switching device carries out logic judgment according to the collected electric quantity and switching quantity and controls the on-off of the switch 1DL, the switch 5DL, the switch 2DL, the switch 4DL, the switch 3DL and the switch 6 DL.

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

the invention provides a single spare power automatic switching system of a self-adaptive 10kV bus operation mode, a mode switcher of the system is connected with a bus wiring mode instruction platform, receives instruction information of bus wiring mode change transmitted by the bus wiring mode instruction platform, switches the bus wiring mode of a 10kV distribution network, a spare power automatic switching device adopts single design to adapt to the bus operation mode change, controls a switch 1DL, a switch 5DL, a switch 2DL, a switch 4DL, a switch 3DL and a switch 6DL, can meet the spare power automatic switching function requirement when a single-section switch operates or a double-section switch operates, solves the problem that when the 10kV bus wiring mode changes 'a single-bus single-section two-section bus and one section bus is a double-branch incoming line' wiring mode, the existing spare power automatic switching device can not meet the requirement that the spare power automatic switching function can be realized when a main transformer becomes lower and either branch operates, the method has the advantages that the matching complexity of related wiring technologies is reduced, the investment cost is saved, the functional requirements of a wiring mode that a single-bus single-section two-section bus is adopted at the first stage and a single-bus double-section four-section bus is adopted at the final stage for the 10kV spare power automatic switching device at the first stage during the staged construction of the transformer substation are met, and the reliable operation of the 10kV bus is guaranteed.

Drawings

Fig. 1 is a structural connection diagram of the single spare power automatic switching system provided by the invention when applied to a 10kV distribution network;

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

Fig. 3 shows a connection mode structure diagram of a single-bus single-segment two-segment bus in which only a third main transformer and a second main transformer are put into operation at the first stage of the construction of the transformer substation, and one segment of the bus is a double-branch incoming line.

Fig. 4 is a block diagram of the backup power automatic switching device according to 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

The invention provides a single spare power automatic switching system adaptive to a 10kV bus running mode, which is applied to a 10kV distribution network, and has the specific connection structure shown in figure 1, 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 second branch C, and a bus III M connected with a third main transformer variable-low single branch D, a first section switch 3DL is connected between the bus I M and the bus II AM in series, a second section switch 6DL is connected between the bus II BM and the bus III M in series, as shown in figure 1, the single spare power automatic switching system comprises a spare power automatic switching device, a mode switch and a bus wiring mode instruction platform, and the spare power automatic switching device is used as the section spare power automatic switching device of the first section switch 3DL, the section switch 6DL, The system comprises a main transformer automatic backup switching device of a first main transformer and a second main transformer, a main transformer automatic backup switching device of a third main transformer and a second main transformer, a single-branch acquisition end a is connected with a first main transformer single-branch low side and a third main transformer single-branch low side, a double-branch acquisition end b is connected with a second main transformer double-branch low side, a first section acquisition end c1 is connected with a first section switch 3DL, a second section acquisition end c2 is connected with a second section switch 6DL, a mode switch is connected with a bus wiring mode instruction platform, instruction information of bus wiring mode change transmitted by the bus wiring mode instruction platform is received, the bus wiring mode of a 10kV distribution network is switched, and the switching of the first section switch, the second section switch, the first main transformer single-branch low side switch, the second main transformer low side switch and the third main transformer single-branch low side switch are controlled according to the switching condition and the operation mode of field equipment.

The mode switcher receives the instruction information that bus wiring mode instruction platform sent, and the 10kV that switches joins in marriage the wiring mode of net generating line and includes: the single-bus single-section two-section bus comprises a single bus and two sections of buses, wherein one section of bus is in a double-branch incoming line connection mode and a single-bus double-section four-section bus connection mode; when the wiring mode of the 10kV distribution network bus is a single-bus single-section two-section bus and one section of the bus is a double-branch incoming line wiring mode, specifically referring to fig. 2 or fig. 3, a bus II AM is communicated with a bus II BM to form a bus II M, and a first main transformer and a second main transformer are put into operation as shown in fig. 2 or a third main transformer and a second main transformer are put into operation as shown in fig. 3; when the wiring mode of the 10kV distribution network bus is the wiring mode of a single-bus double-section four-section bus, the connection structure diagram can be seen in fig. 1, the bus II AM is not communicated with the bus II BM, and the first main transformer, the second main transformer and the third main transformer are all put into operation.

In specific implementation, because the 10kV distribution network bus is in a wiring mode of 'single-bus single-section two-section bus and one section of bus is double-branch incoming line' during first-stage construction, when the bus wiring mode instruction platform sends instruction information of first-stage construction of a bus, the mode switcher receives the instruction information, one condition is that two main transformers in operation are a first main transformer and a second main transformer, a third main transformer is not in operation, the first main transformer becomes a single branch A which is connected with a bus I M, the bus I M is a single-branch incoming line, the second main transformer becomes a first branch B which is connected with a bus II AM, the second main transformer becomes a second branch C which is connected with a bus II BM, the bus II AM is communicated with the bus II BM to be a bus II M, the bus II M is a double-branch incoming line, the spare power automatic switching device is used as a subsection spare power automatic switching device of a first subsection switch 3DL, and the main transformer spare power automatic switching device of the first main transformer and the second main transformer, and the specific structure is shown in figure 2; the other situation is that two main transformers in operation are a third main transformer and a second main transformer, the first main transformer is not in operation, a first branch B of a second main transformer variable-low is connected with a bus II AM, a second branch C of the second main transformer variable-low is connected with a bus II BM, the bus II AM is communicated with the bus II BM to form a bus II M, the bus II M is a double-branch incoming line, a single branch D of the third main transformer variable-low is connected with a bus III M, the bus III M is a single-branch incoming line, a spare power automatic switching device is used as a subsection spare power automatic switching device of a second subsection switch 6DL, and a main transformer spare power automatic switching device of the third main transformer and the second main transformer is accessed, and the specific structure is shown in FIG. 3; when a 10kV distribution network bus is in a final-stage construction, the bus is in a single-bus double-subsection four-section bus connection mode, when a bus connection mode instruction platform sends instruction information of the final-stage construction of the bus, a mode switcher receives the instruction information, three main transformers are all put into operation, a spare power automatic switching device is used as subsection spare power automatic switching of a first subsection switch 3DL and a second subsection switch 6DL, and main transformer spare power automatic switching of the first main transformer and the second main transformer and main transformer spare power automatic switching of a third main transformer and the second main transformer, the structural connection is shown in figure 1, according to the change of a 10kV bus connection mode, the spare power automatic switching device is self-adaptive to the change of the bus operation mode, the first subsection switch, the second subsection switch, the first main transformer single-branch low-side switch, the second main transformer double-branch low-side switch and the third main transformer single-branch low-side switch are controlled to meet the function requirement of the spare power automatic switching during the operation of a single-section switch or the operation of a double-section switch, the phenomenon that the conventional spare power automatic switching device can realize the spare power automatic switching function under the single-bus double-section four-section bus in a self-adaptive manner only by matching two spare power automatic switching devices is avoided, the technical matching complexity is reduced, and the cost is saved.

Referring to fig. 1, a switch 1DL is further disposed on a line connecting the first main transformer low-voltage single branch a and the bus im, and is used for controlling on-off of a connection line connecting the first main transformer low-voltage single branch a and the bus im; a switch 2DL is further arranged on a circuit connecting the first branch B of the second main transformer and the bus II AM and is used for controlling the connection and disconnection of the connecting circuit of the first branch B of the second main transformer and the bus II AM; a switch 4DL is further arranged on a line connecting the second branch C of the second main transformer with the bus II BM and is used for controlling the connection and disconnection of the connecting line between the second branch C of the second main transformer with the bus II BM; and a switch 5DL is further arranged on a line connecting the third main transformer low-changing single branch D and the bus IIIM and used for controlling the connection and disconnection of a connecting line between the third main transformer low-changing single branch D and the bus IIIM, and in addition, current transformers I1-I4 are further arranged on the low sides of the main transformers.

Referring to a structure diagram of the backup power automatic switching device shown in fig. 4, the backup power automatic switching device includes:

the communication module is used for supporting the network communication between the CPU processor and the substation automation system and transmitting an action message and an abnormal alarm signal message sent by the CPU processor to the substation background monitoring system and the telecontrol communication system; the communication module supports the universal 61850/103 protocol of the transformer substation.

And the power supply module is respectively connected with the alternating current module, the communication module, the CPU processor, the opening module and the opening module, converts the externally accessed DC110V or DC220V working power supply voltage into the working power supply voltage required by the alternating current module, the communication module, the CPU processor, the opening module and the opening module, the working power supply voltage of the alternating current module, the CPU processor, the communication module and the management panel is DC5V, the working power supply voltage of the opening module and the opening module is DC110V or DC220V, and when the switching value collected by the opening module is DC110V or DC220V positive electricity level, the switching value is opened.

Referring to fig. 4, when the automatic backup power switching device is connected to a 10kV distribution network line, the single-branch acquisition end a, the double-branch acquisition end b, the first segment acquisition end c1, and the second segment acquisition end c2 correspond to the ac module and the access module of the automatic backup power switching device.

In this embodiment, when the 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, the ac module collects the bus voltage, the current of the first main transformer low single branch a or the third main transformer low single branch D, and the current of the second main transformer low first branch B and the second branch C; when the bus connection mode is a single-bus double-section four-section bus connection mode, the alternating current module collects bus voltage, currents of a first main transformer low-changing single branch A and a third main transformer low-changing single branch D, and currents of a second main transformer low-changing first branch B and a second branch C; namely, under two different 10kV bus wiring modes, when any branch of the double-branch main transformer becomes low, the spare power automatic switching system can acquire the current magnitude of the double-branch main transformer, and the current magnitudes are used as the input of the spare power automatic switching system and are combined with other matching conditions, so that when any branch of the double-branch main transformer becomes low, the spare power automatic switching function can be realized.

In specific implementation, when the bus connection mode is "single bus single-section two-section bus and one section of the bus is a double-branch incoming line", referring to fig. 2, if a first main transformer and a second main transformer are put into operation, an opening module of the backup automatic switching device collects switching quantities such as a switching position, a closing position (or a hand trip signal), a backup protection action blocking signal and the like of a switch 1DL on a connection line of a first main transformer low-changing single branch a and a bus im, switching quantities such as a switching position, a closing position (or a hand trip signal), a backup protection action blocking signal and the like of a switch 2DL on a connection line of a second main transformer low-changing first branch B and a bus ii AM, switching quantities such as a switching position, a closing position (or a hand trip signal), a backup protection action blocking signal and the like of a switch 4DL on a connection line BM of a second main transformer low-changing second branch C and a bus ii, and a switching position of a switch 3DL on a connection line, the automatic switching system comprises a first sectional switch 3DL sectional spare power automatic switching function pressing plate, a main transformer spare power automatic switching function pressing plate of a first main transformer and a second main transformer, switching of a mode switcher, a switch 2DL overhaul pressing plate, a switch 4DL overhaul pressing plate, a spare power automatic switching device overhaul pressing plate and other switching values. Referring to fig. 3, if a third main transformer and a second main transformer are switched in, the switching module of the backup automatic switching device collects switching values such as the switching position, the closed position (or the hand trip signal), the backup protection action blocking signal and the like of the switch 5DL on the connecting line of the single branch D of the third main transformer and the bus iiim, switching values such as the switching position, the closed position (or the hand trip signal), the backup protection action blocking signal and the like of the switch 2DL on the connecting line of the first branch B of the second main transformer and the bus iiam, switching values such as the switching position, the closed position (or the hand trip signal), the backup protection action blocking signal and the like of the switch 4DL on the connecting line of the second branch C of the second main transformer and the bus iibm, switching values of the switching position of the second section switch 6DL, a section backup automatic switching function pressing plate of the second section switch 6DL, a main automatic switching function pressing plate of the third main transformer and a main transformer, a backup automatic switching function pressing plate of the second main transformer, Switching values of a mode switcher, a switch 2DL overhaul pressing plate, a switch 4DL overhaul pressing plate, a spare power automatic switching device overhaul pressing plate and the like;

as shown in figure 1, when three main transformers are all put into operation, the bus connection mode is a connection mode of a single-bus double-subsection four-section bus, an opening module of the spare power automatic switching device acquires switching values such as the switching position, the closing position (or a hand-trip signal) and a standby protection action locking signal of a switch 1DL on a connecting line of a first main transformer-changing single branch A and a bus I M, the switching values such as the switching position, the closing position (or the hand-trip signal) and the standby protection action locking signal of a switch 2DL on a connecting line of a second main transformer-changing single branch B and a bus II AM, the switching value of a switching position of a first section switch 3DL, the switching position, the closing position (or the hand-trip signal) and the standby protection action locking signal of a switch 5DL on a connecting line of a third main transformer-changing single branch D and a bus III M, the switching position, the standby protection action locking signal and the like of a switch 4DL on a connecting line of a second main transformer-changing second branch C and a bus II BM, Switching values such as a closing position (or a hand-jumping signal), a backup protection action locking signal and the like, switching values of a switching position of a second section switch 6DL, a first section switch 3DL section spare power automatic switching function pressing plate, a main transformer spare power automatic switching function pressing plate of a first main transformer and a second main transformer, a second section switch 6DL section spare power automatic switching function pressing plate, a main transformer spare power automatic switching function pressing plate of a third main transformer and a second main transformer, switching of a mode switcher, a switch 2DL overhaul pressing plate, a switch 4DL overhaul pressing plate, a spare power automatic switching device overhaul pressing plate and the like; by integrating the acquisition input of the switching value and the current and voltage electrical quantities, when the double-branch main transformer becomes low and any branch runs, the spare power automatic switching system can realize the spare power automatic switching function.

In specific implementation, when two main transformers in operation are a first main transformer and a second main transformer, a switching-out module of the spare power automatic switching device can be used for switching out switching-out amounts of a tripping first main transformer low-voltage switch 1DL, a tripping second main transformer low-voltage switch 2DL, a tripping second main transformer low-voltage switch 4DL, a tripping first section switch 3DL and the like; when the two main transformers in operation are a third main transformer and a second main transformer, the switching-out module of the spare power automatic switching device can be used for switching out switching-out quantities of a tripping third main transformer low-voltage switch 5DL, a tripping second main transformer low-voltage switch 2DL, a tripping second main transformer low-voltage switch 4DL, a tripping second section switch 6DL and the like; when three main transformers are put into operation and a 10kV bus is in a connection mode of a single-bus double-subsection four-section bus, the spare power automatic switching device can be used for opening and closing a first main transformer low-voltage switch 1DL, a second main transformer low-voltage switch 2DL, a first subsection switch 3DL, a second main transformer low-voltage switch 4DL, a third main transformer low-voltage switch 5DL, a second subsection switch 6DL and the like.

The CPU processor is provided with a logic judgment unit, the logic judgment unit comprises a subsection spare power automatic switching logic judgment unit and a main transformer spare power automatic switching logic judgment unit, the subsection spare power automatic switching logic judgment unit is used for finishing logic judgment of subsection spare power automatic switching, the main transformer spare power automatic switching logic judgment unit is used for finishing logic judgment of main transformer spare power automatic switching, and the subsection spare power automatic switching logic judgment unit and the main transformer spare power automatic switching logic judgment unit perform logic judgment on information collected by an alternating current module and a switching-in module to drive the switching-out module to trip-close a switch 1DL, a switch 5DL, a switch 2DL, a switch 4DL, a switch 3DL and a switch 6 DL.

In specific implementation, a CPU processor is provided with a sectional spare power automatic switching logic judgment unit and a main transformer spare power automatic switching logic judgment unit, the sectional spare power automatic switching logic judgment unit and the main transformer spare power automatic switching logic judgment unit are both provided with logic judgment programs, and the corresponding sectional spare power automatic switching logic judgment program and the main transformer spare power automatic switching logic judgment program are switched in according to the change of a 10kV bus operation mode; the logic judgment program of the subsection spare power automatic switching logic judgment unit refers to a logic judgment program of a first subsection switch 3DL subsection spare power automatic switching and a logic judgment program of a second subsection switch 6DL subsection spare power automatic switching, and the logic judgment program of the main transformer spare power automatic switching logic judgment unit refers to a main transformer spare power automatic switching logic program of a first main transformer and a second main transformer and a main transformer spare power automatic switching logic program of a third main transformer and the second main transformer; as shown in fig. 2, when the two main transformers are first main transformer and second main transformer, the 10kV bus im voltage, bus iim voltage, switch 1DL, switch 2DL, switch 4DL, and switch 3DL participate in the sectional backup power automatic switching of the first sectional switch 3DL and the main transformer backup power automatic switching logic judgment program of the first main transformer and second main transformer, as shown in fig. 3, when the two main transformers are third main transformer and second main transformer, the 10kV bus iiim voltage, bus iim voltage, switch 5DL, switch 2DL, switch 4DL, and switch 6DL participate in the sectional backup power automatic switching of the second sectional switch 6DL and the main transformer backup power automatic switching logic judgment program of the third main transformer and second main transformer, as shown in fig. 1, when the three main transformers are put into operation, the 10kV bus im voltage, bus iiam voltage, switch 1DL, switch 2DL, and switch 3DL participate in the sectional backup power automatic switching logic judgment program of the first sectional switch 3DL and the first main transformer and second main transformer, the 10kV bus IIIM voltage, the bus II BM voltage, the switch 5DL, the switch 4DL and the switch 6DL participate in a subsection spare power automatic switching of the second subsection switch 6DL and a main transformer spare power automatic switching logic judgment program of a third main transformer and a second main transformer; the spare power automatic switching logic judgment program of the spare power automatic switching device carries out self-adaptive logic judgment according to information acquired by the alternating current module and the switching-in module, and solves the problem that when the 10kV bus wiring mode is changed into a single-bus single-section two-section bus and one section of the bus is in a double-branch incoming line wiring mode, the existing 10kV spare power automatic switching device cannot meet the requirement that the spare power automatic switching function can be realized when any branch of a double-branch main transformer is changed into any branch of the double-branch main transformer.

In this embodiment, as shown in fig. 4, the switch-out module is connected to the external outlet relay and the signal relay, and when the CPU processor issues an instruction to trip on the switch 1DL, the switch 5DL, the switch 2DL, the switch 4DL, the switch 3DL, and the switch 6DL, the switch-out module drives the trip-out relay of the corresponding switch 1DL, the switch 5DL, the switch 2DL, the switch 4DL, the switch 3DL, and the switch 6DL to operate; when the spare power automatic switching device acts, the CPU sends an action signal command, and then the output module drives the signal relay to act to send an action message; when the spare power automatic switching device is abnormal, the CPU sends an abnormal alarm signal command, and then the output module drives the signal relay to act and sends an abnormal alarm message.

In this embodiment, as shown in fig. 4, the backup power automatic switching device further includes a management panel, the management panel is connected to the power module, and supplies power through the power module, the management panel includes a display and a human-machine input module, the display is respectively connected to the CPU processor and the human-machine input module, and is configured to display information collected by the ac module and the start-up module, and a backup power automatic switching action report processed by the CPU processor, and the human-machine input module is connected to the display and is configured to allow a worker to view device setting values, parameters, and action reports and input backup power automatic switching setting value modification, setting values, and action report printing instructions.

In specific implementation, the mode switcher can adopt one of control word switching, hard pressure plate switching, soft pressure plate switching or operation handle switching to switch the bus connection mode of the 10kV distribution network.

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 single spare power automatic switching system adaptive to a 10kV bus running mode is applied to 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 single branch A, a bus II AM connected with a second main transformer variable first branch B, a bus II BM connected with a second main transformer variable second branch C, and a bus III M connected with a third main transformer variable single branch D, a first section switch 3DL is connected between the bus I M and the bus II AM in series, and a second section switch 6DL is connected between the bus II BM and the bus III M in series The main transformer spare power automatic switching device comprises a main transformer spare power automatic switching device of a first main transformer and a second main transformer, a main transformer spare power automatic switching device of a third main transformer and a second main transformer, a single-branch acquisition end a of the spare power automatic switching device is connected with a first main transformer single-branch low side and a third main transformer single-branch low side, a double-branch acquisition end b of the spare power automatic switching device is connected with a second main transformer double-branch low side, a first section acquisition end c1 of the spare power automatic switching device is connected with a first section switch 3DL, a second section acquisition end c2 of the spare power automatic switching device is connected with a second section switch 6DL, a mode switcher is connected with a bus wiring mode instruction platform, instruction information of bus wiring mode change transmitted by the bus wiring mode instruction platform is received, the bus wiring mode of a 10kV distribution network is switched, the operation mode of a spare power automatic switching device self-adaptive bus is changed, and the first section switch 3DL, the second section switch 6DL, the spare power automatic switching device of the first main transformer and the second main transformer is controlled according to the field device and the field device, The first main transformer single-branch low-side switch 1DL, the second main transformer double-branch low-side switch 2DL, the second main transformer double-branch low-side switch 4DL and the third main transformer single-branch low-side switch 5DL are connected and disconnected;

the spare power automatic switching device comprises:

the switching module is used for acquiring switching values of a first main transformer single-branch low-side switch 1DL, a second main transformer double-branch low-side switch 2DL, a second main transformer double-branch low-side switch 4DL, a first section switch 3DL and a second section switch 6DL and a switching value of the mode switch;

the switching-out module is used for switching a first main transformer single-branch low-side switch 1DL, a third main transformer single-branch low-side switch 5DL, a second main transformer double-branch low-side switch 2DL, a second main transformer double-branch low-side switch 4DL, a first section switch 3DL and a second section switch 6 DL;

the CPU processor receives and processes the information acquired by the alternating current module and the switching-in module, drives the switching-out module to jump and connect the first main transformer single-branch low-side switch 1DL, the third main transformer single-branch low-side switch 5DL, the second main transformer double-branch low-side switch 2DL, the second main transformer double-branch low-side switch 4DL, the first section switch 3DL and the second section switch 6DL, and sends an action message and an abnormal alarm signal message; the CPU processor is provided with a logic judgment unit, the logic judgment unit comprises a subsection spare power automatic switching logic judgment unit and a main transformer spare power automatic switching logic judgment unit, the subsection spare power automatic switching logic judgment unit is used for finishing logic judgment of subsection spare power automatic switching, the main transformer spare power automatic switching logic judgment unit is used for finishing logic judgment of main transformer spare power automatic switching, the subsection spare power automatic switching logic judgment unit and the main transformer spare power automatic switching logic judgment unit perform logic judgment on information collected by an alternating current module and a main transformer switching-in module, and a switching-out module is driven to jump a first main transformer single-branch low-side switch 1DL, a third main transformer single-branch low-side switch 5DL, a second main transformer double-branch low-side switch 2DL, a second double-branch low-side switch 4DL, a first subsection switch 3DL and a second subsection switch 6 DL;

the power supply module is respectively connected with the alternating current module, the communication module, the CPU processor, the opening module and the opening module, and converts the externally-accessed DC110V or DC220V working power supply voltage into the working power supply voltage required by the alternating current module, the communication module, the CPU processor, the opening module and the opening module;

when the bus connection mode is a single bus single-section two-section bus connection mode, and one section of the bus is a double-branch incoming line connection mode, the alternating current module collects bus voltage, current of a first main transformer low single branch A or a third main transformer low single branch D, and current of a second main transformer low first branch B and a second branch C; when the bus connection mode is a single-bus double-section four-section bus connection mode, the alternating current module collects bus voltage, currents of the first main transformer low-changing single branch A and the third main transformer low-changing single branch D, and currents of the second main transformer low-changing first branch B and the second branch C; namely, under two different 10kV bus wiring modes, when the double-branch main transformer becomes to run in any branch, the spare power automatic switching system can acquire the current magnitude of the double-branch main transformer.

2. The single spare power automatic switching system capable of adapting to the operation mode of the 10kV bus according to claim 1, wherein the mode switcher receives instruction information sent by a bus wiring mode instruction platform, and the switched wiring mode of the 10kV distribution network bus comprises: the single-bus single-section two-section bus comprises a single bus and two sections of buses, wherein one section of bus is in a double-branch incoming line connection mode and a single-bus double-section four-section bus connection mode; when the wiring mode of the 10kV distribution network bus is a single-bus single-section two-section bus and one section of the bus is a double-branch incoming line wiring mode, the bus IIAM is communicated with the bus IIBM to be a bus IIM, and a first main transformer and a second main transformer are put into operation, a third main transformer is not put into operation, or the third main transformer and the second main transformer are put into operation, and the first main transformer is not put into operation; when the wiring mode of the 10kV distribution network bus is a single-bus double-section four-section bus wiring 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 single spare power automatic switching system for the operation mode of the adaptive 10kV bus according to claim 1, wherein a switch 1DL is further arranged on a line connecting the first main transformer-substation single branch A and the bus IM and is used for controlling the connection and disconnection of the line connecting the first main transformer-substation single branch A and the bus IM; a switch 2DL is further arranged on a circuit connecting the first branch B of the second main transformer and the bus II AM and is used for controlling the connection and disconnection of the connecting circuit of the first branch B of the second main transformer and the bus II AM; a switch 4DL is further arranged on a line connecting the second branch C of the second main transformer with the bus II BM and is used for controlling the connection and disconnection of the connecting line between the second branch C of the second main transformer with the bus II BM; and a switch 5DL is further arranged on a circuit connecting the third main transformer variable-low single branch D and the bus III M and used for controlling the connection and disconnection of the connecting circuit connecting the third main transformer variable-low single branch D and the bus III M.

4. The self-adaptive 10kV bus operation mode single spare power automatic switching system according to claim 3, the switch-out module is connected with an external outlet relay and a signal relay, when the CPU processor drives the switch-out module to jump and connect commands in a first main transformer single-branch low-side switch 1DL, a third main transformer single-branch low-side switch 5DL, a second main transformer double-branch low-side switch 2DL, a second main transformer double-branch low-side switch 4DL, a first section switch 3DL and a second section switch 6DL, the switching-out module drives the tripping outlet relays of the corresponding switches, namely a first main transformer single-branch low-side switch 1DL, a third main transformer single-branch low-side switch 5DL, a second main transformer double-branch low-side switch 2DL, a second main transformer double-branch low-side switch 4DL, a first section switch 3DL and a second section switch 6DL to act; when the spare power automatic switching device acts, the CPU sends an action signal command, and then the output module drives the signal relay to act to send an action message; when the spare power automatic switching device is abnormal, the CPU sends an abnormal alarm signal command, and then the output module drives the signal relay to act and sends an abnormal alarm message.

5. The single spare power automatic switching system with the self-adaptive 10kV bus operation mode according to claim 4, wherein the spare power automatic switching device further comprises a management panel, the management panel is connected with the power supply module and supplies power through the power supply module, the management panel comprises a display and a human-computer input module, the display is respectively connected with the CPU processor and the human-computer input module and used for displaying information collected by the alternating current module and the switching-in module and a spare power automatic switching action report processed by the CPU processor, and the human-computer input module is connected with the display and used for a worker to check device constant values, parameters and action reports and input a spare power automatic switching constant value modification, constant value and action report printing instruction.

6. The single spare power automatic switching system for the adaptive 10kV bus operation mode according to claim 5, wherein the communication module supports a universal 61850/103 protocol for substations.

7. The single spare power automatic switching system with the adaptive 10kV bus running mode according to claim 6, wherein the working power supply voltage of the alternating current module, the CPU processor, the communication module and the management panel is DC5V, the working power supply voltage of the input module and the output module is DC110V or DC220V, and when the switching value collected by the input module is DC110V or DC220V positive level, the switching value is input.

8. The single spare power automatic switching system for the self-adaptive 10kV bus running mode according to claim 2, wherein the mode switcher switches the bus connection mode of the 10kV distribution network by adopting one of control word switching, hard pressure plate switching, soft pressure plate switching or operating handle switching.