CN111682533B - Automatic switching method and device for grounding transformer - Google Patents

Abstract

The invention relates to the technical field of power supply, and provides a method and a device for automatically switching a grounding transformer. Wherein, the method comprises the following steps: firstly, detecting a power supply system to obtain power supply parameters of the power supply system, secondly, judging whether each power supply circuit unit supplies power to a corresponding load unit according to the power supply parameters, then, when the target power supply circuit unit does not supply power to the corresponding target load unit, detecting the working mode of the target grounding transformer, and finally, adjusting the connection relation between the target power supply circuit unit and the ground according to the working mode of the target grounding transformer. Compared with the prior art that the connection relation between the power supply circuit unit and the ground is adjusted by disconnecting the grounding transformer or changing the working mode of the grounding transformer by electric power workers, the automatic switching method of the grounding transformer provided by the invention automatically adjusts the connection relation between the power supply circuit unit and the ground, and improves the operation efficiency.

Description

Automatic switching method and device for grounding transformer

The invention relates to a divisional application with application date of 14.09.2018 and application number of 201811072798.5, and the invention provides an automatic grounding transformer switching method and device.

Technical Field

The embodiment of the invention relates to the technical field of power supply, in particular to a method and a device for automatically switching a grounding transformer.

Background

In the power supply system, each main transformer supplies power to the load units which are electrically connected correspondingly, and in order to ensure that the ground fault can be isolated quickly, a grounding transformer is required to be arranged in each load unit so as to build a grounding current loop. When a main transformer fails or is disconnected due to maintenance, the spare power automatic switching device can control the power supply system to be switched to other main transformers normally supplying power from the main transformers and simultaneously supply power to at least two load units. When a power supply system fails, the power supply system is rejected or misoperated due to the multiple grounding points, so that equipment is damaged or the accident range is expanded.

In the prior art, generally, an electric power worker disconnects a grounding transformer or changes the working mode of the grounding transformer to adjust the connection relation between a power supply line unit and the ground, and the operation efficiency is very low.

Disclosure of Invention

The embodiment of the invention aims to provide a method and a device for automatically switching a grounding transformer, so as to solve the problem that in the prior art, the operation efficiency of electric power workers for adjusting the connection relation between a power supply circuit unit and the ground is very low.

In order to achieve the above purpose, the embodiment of the present invention adopts the following technical solutions:

the invention provides an automatic switching method of a grounding transformer, which is used for adjusting the grounding state of a power supply system, wherein the power supply system comprises a plurality of power supply modules which are electrically connected in sequence, each power supply module comprises a power supply circuit unit and a load unit which is electrically connected with the power supply circuit, and each load unit comprises a grounding transformer; the method comprises the following steps: detecting the power supply system to obtain power supply parameters of the power supply system; judging whether each power supply circuit unit supplies power to the corresponding load unit according to the power supply parameters; when it is judged that a target power supply circuit unit does not supply power to the corresponding target load unit, detecting the working mode of the target grounding transformer; and adjusting the connection relation between the target power supply circuit unit and the ground according to the working mode of the target grounding transformer.

The invention also provides an automatic grounding transformer switching device which is used for adjusting the grounding state of a power supply system, wherein the power supply system comprises a plurality of power supply modules which are electrically connected in sequence, each power supply module comprises a power supply circuit unit and a load unit which is electrically connected with the power supply circuit, and each load unit comprises a grounding transformer; the device comprises: the parameter detection module is used for detecting the power supply system to obtain power supply parameters of the power supply system; the power supply judging module is used for judging whether each power supply circuit unit supplies power to the corresponding load unit according to the power supply parameters; the mode detection module is used for detecting the working mode of the target grounding transformer when the target power supply circuit unit is judged not to supply power to the corresponding target load unit; and the execution module is used for adjusting the connection relation between the target power supply circuit unit and the ground according to the working mode of the target grounding transformer.

Compared with the prior art, the method and the device for automatically switching the grounding transformer provided by the embodiment of the invention have the advantages that the power supply system is detected to obtain the power supply parameters of the power supply system, and whether each power supply circuit unit supplies power to the corresponding load unit is judged according to the power supply parameters; when the target power supply circuit unit is judged not to supply power to the corresponding target load unit, detecting the working mode of the target grounding transformer; and adjusting the connection relation between the target power supply circuit unit and the ground according to the working mode of the target grounding transformer. Compared with the prior art that the connection relation between the power supply circuit unit and the ground is adjusted by disconnecting the grounding transformer or changing the working mode of the grounding transformer by electric power workers, the automatic switching method of the grounding transformer provided by the invention automatically adjusts the connection relation between the power supply circuit unit and the ground, and improves the operation efficiency.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 shows a schematic structural diagram of a power supply system provided in an embodiment of the present invention.

Fig. 2 shows a block schematic diagram of an electronic device provided by an embodiment of the invention.

Fig. 3 shows a flowchart of an automatic switching method of a grounding transformer according to an embodiment of the present invention.

Fig. 4 is a flowchart illustrating sub-steps of step S101 shown in fig. 3.

Fig. 5 is a flowchart illustrating sub-steps of step S101 shown in fig. 3.

Fig. 6 is a flowchart illustrating sub-steps of step S101 shown in fig. 3.

Fig. 7 is a flowchart illustrating sub-steps of step S102 shown in fig. 3.

Fig. 8 is a flowchart illustrating sub-steps of step S102 shown in fig. 3.

Fig. 9 is a flowchart illustrating sub-steps of step S102 shown in fig. 3.

Fig. 10 is a flowchart illustrating sub-steps of step S103 shown in fig. 3.

Fig. 11 is a flowchart illustrating sub-steps of step S104 shown in fig. 3.

Fig. 12 is a block diagram illustrating an automatic grounding switching device according to an embodiment of the present invention.

Icon: 20-a power supply system; 21-a first power supply module; 210-a first power supply line unit; 211-a first main transformer high-voltage switch; 212-a first power supply main transformer; 213-first main transformer low-level switch; 220-a first load unit; 221-first ground connection; 2211-first ground to high switch; 2213-first grounding switch; 222 — a first load; 22-a first section switch; 23-a second power supply module; 230-a second power supply line unit; 231-a second main transformer high-level switch; 232-a second power supply main transformer; 233-a second main variable low switch; 240-a second load unit; 241-second grounding change; 2411-a second grounding transformer high-level switch; 2413-a second grounding disconnecting link; 242 — a second load; 24-a second section switch; 25-a third power supply module; 250-a third power supply line unit; 251-a third main transformer high-voltage switch; 252-a third power supply main transformer; 253-a third main variable low switch; 260-a third load unit; 261-third grounding; 2611-third ground going high switch; 2613-third ground disconnecting link; 262-a third load; 10-an electronic device; 101-a memory; 102-a memory controller; 103-a processor; 104-peripheral interfaces; 105-a display screen; 300-automatic switching device of grounding transformer; 301-parameter detection module; 302-power supply judging module; 303-a mode detection module; 304-execution module.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present invention, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.

The electronic device 10 is connected to the power supply system 20, wherein the power supply system 20 may be electrically connected to the electronic device 10 or may be communicatively connected thereto. The electronic device 10 is used to adjust the ground state of the power supply system 20.

Referring to fig. 1, the power supply system 20 includes a plurality of power supply modules and at least one section switch, two adjacent power supply modules are electrically connected through the section switch, and the section switch is used for sequentially electrically connecting the plurality of power supply modules.

Each power supply module comprises a power supply circuit unit and a load unit correspondingly and electrically connected with the power supply circuit unit. Every power supply line unit all includes that the main becomes to become the change switch, power supply owner becomes, main change becomes change switch and power supply line, and the power supply line is used for realizing that the main electricity that becomes change switch, power supply owner become and main electricity that becomes change switch connects in proper order. The main transformer low-voltage switch is electrically connected with the load unit through a power supply line. The main-transformer-side high-voltage switch may be a circuit breaker on the high-voltage side of the power supply main transformer, and the main-transformer-side low-voltage switch may be a circuit breaker on the low-voltage side of the power supply main transformer. The electronic device 10 is used to adjust the grounding state of the power supply system 20, i.e., the connection relationship between the power supply line unit and the ground.

Each load unit comprises a plurality of loads, a grounding transformer and a load line, and the plurality of loads and the grounding transformer are electrically connected with the load line. The loads and the grounding transformer are electrically connected with the power supply circuit unit through the load circuits. Each grounding transformer comprises a grounding transformer switch, a grounding main transformer, a grounding disconnecting link and a grounding resistor which are sequentially electrically connected, one end of the grounding resistor is electrically connected with the grounding disconnecting link, and the other end of the grounding resistor is connected with the ground. It should be noted that the grounding transformer high-voltage switch may be a switch between the load line and the grounding transformer, and is used for controlling connection or disconnection between the grounding transformer and the load line.

In the embodiment of the present invention, the power supply system 20 includes 3 power supply modules for illustration.

The 3 power supply modules are respectively a first power supply module 21, a second power supply module 23 and a third power supply module 25, the first power supply module 21 and the second power supply module 23 are electrically connected through a first section switch 22, and the second power supply module 23 and the third power supply module 25 are electrically connected through a second section switch 24.

The first power supply module 21 includes a first power supply circuit unit 210 and a first load unit 220, the first power supply circuit unit 210 is electrically connected to the first load unit 220, the first power supply circuit unit 210 includes a first main transformer change-over switch 211, a first power supply main transformer 212, a first main transformer change-over switch 213 and a first power supply circuit, the first main transformer change-over switch 211, the first power supply main transformer 212 and the first main transformer change-over switch 213 are electrically connected in sequence through the first power supply circuit, and the first main transformer change-over switch 213 is electrically connected to the first load unit 220 through the first power supply circuit. The first load unit 220 includes a first ground transformer 221, a plurality of first loads 222 and a first load line, the plurality of first loads 222 and the first ground transformer 221 are electrically connected to the first load line, and the plurality of first loads 222 and the first ground transformer 221 are electrically connected to the first power supply line of the first power supply line unit 210 through the first load line. The first grounding transformer 221 includes a first grounding transformer high-voltage switch 2211, a first grounding main transformer, a first grounding switch 2213 and a first grounding resistor, which are electrically connected in sequence, one end of the first grounding resistor is electrically connected to the first grounding switch 2213, the other end of the first grounding resistor is connected to ground, and the first grounding transformer high-voltage switch 2211 is electrically connected to the first load line.

The second power supply module 23 includes a second power supply circuit unit 230 and a second load unit 240, the second power supply circuit unit 230 is electrically connected to the second load unit 240, the second power supply circuit unit 230 includes a second main transformer change-over switch 231, a second power supply main transformer 232, a second main transformer change-over switch 233 and a second power supply circuit, the second main transformer change-over switch 231, the second power supply main transformer 232 and the second main transformer change-over switch 233 are electrically connected in sequence through the second power supply circuit, and the second main transformer change-over switch 233 is electrically connected to the second load unit 240 through the second power supply circuit. The second load unit 240 includes a second ground transformer 241, a plurality of second loads 242 and a second load line, the plurality of second loads 242 and the second ground transformer 241 are electrically connected to the second load line, and the plurality of second loads 242 and the second ground transformer 241 are electrically connected to the second power supply line of the second power supply line unit 230 through the second load line. The second grounding transformer 241 includes a second grounding transformer height-changing switch 2411, a second grounding main transformer, a second grounding disconnecting link 2413 and a second grounding resistor, which are electrically connected in sequence, one end of the second grounding resistor is electrically connected with the second grounding disconnecting link 2413, the other end of the second grounding resistor is connected with the ground, and the second grounding transformer height-changing switch 2411 is electrically connected with the second load circuit.

The first section switch 22 is electrically connected to both the first power supply module 21 and the second power supply module 23, one end of the first section switch 22 is electrically connected between the first power supply line unit 210 and the first load unit 220 of the first power supply module 21, and the other end of the first section switch 22 is electrically connected between the second power supply line unit 230 and the second load unit 240 of the second power supply module 23.

The third power supply module 25 includes a third power supply line unit 250 and a third load unit 260, the third power supply line unit 250 is electrically connected to the third load unit 260, the third power supply line unit 250 includes a third main transformer high-voltage switch 251, a third power supply main transformer 252, a third main transformer low-voltage switch 253 and a third power supply line, the third main transformer high-voltage switch 251, the third power supply main transformer 252 and the third main transformer low-voltage switch 253 are electrically connected in sequence through the third power supply line, and the third main transformer low-voltage switch 253 is electrically connected to the third load unit 260 through the third power supply line. The third load unit 260 includes a third ground transformer 261, a plurality of third loads 262 and a third load line, the plurality of third loads 262 and the third ground transformer 261 are electrically connected to the third load line, and the plurality of third loads 262 and the third ground transformer 261 are electrically connected to the third power supply line of the third power supply line unit 250 through the third load line. The third grounding transformer 261 includes a third grounding transformer high-voltage switch 2611, a third grounding main transformer, a third grounding switch 2613 and a third grounding resistor, which are electrically connected in sequence, one end of the third grounding resistor is electrically connected to the third grounding switch 2613, the other end of the third grounding resistor is connected to the ground, and the third grounding transformer high-voltage switch 2611 is electrically connected to a third load line.

The second section switch 24 is electrically connected to both the second power supply module 23 and the third power supply module 25, one end of the second section switch 24 is electrically connected between the second power supply line unit 230 of the second power supply module 23 and the second load unit 240, and the other end of the second section switch 24 is electrically connected between the third power supply line unit 250 of the third power supply module 25 and the third load unit 260.

Referring to fig. 2, fig. 2 is a block diagram illustrating an electronic device 10 according to an embodiment of the invention. The electronic device 10 may be, but is not limited to, a smart phone, a tablet computer, a laptop portable computer, a car computer, a Personal Digital Assistant (PDA), and the like. The electronic device 10 includes a memory 101, a memory controller 102, a processor 103, a peripheral interface 104, a display screen 105, and a ground-to-ground automatic switching apparatus 300.

The memory 101, memory controller 102, processor 103, peripheral interface 104 and display screen 105 are electrically connected to each other, directly or indirectly, to enable data transmission or interaction. For example, the components may be electrically connected to each other via one or more communication buses or signal lines. The automatic grounding switching device 300 includes at least one software function module which can be stored in the memory 101 in the form of software or firmware (firmware) or is fixed in an Operating System (OS) of the electronic device 10. The processor 103 is used for executing an executable module stored in the memory 101, such as a software functional module or a computer program included in the automatic grounding switching device 300.

The Memory 101 may be, but is not limited to, a Random Access Memory (RAM), a Read Only Memory (ROM), a Programmable Read-Only Memory (PROM), an Erasable Read-Only Memory (EPROM), an electrically Erasable Read-Only Memory (EEPROM), and the like. The memory 101 is configured to store a program, and the processor 103 executes the program after receiving an execution instruction, and the method executed by the server defined by the process disclosed in the embodiment of the present invention may be applied to the processor 103, or implemented by the processor 103.

The processor 103 may be an integrated circuit chip having signal processing capabilities. The Processor 103 may be a general-purpose Processor 103, and includes a Central Processing Unit (CPU), a Network Processor (NP), a voice Processor, a video Processor, and the like; but may also be a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, discrete gate or transistor logic, discrete hardware components. The various methods, steps and logic blocks disclosed in the embodiments of the present invention may be implemented or performed. The general purpose 3 may be a microprocessor or the processor 103 may be any conventional processor 103 or the like.

The peripheral interface 104 is used to couple various input/output devices to the processor 103 as well as to the memory 101. In some embodiments, the peripheral interface 104, the processor 103, and the memory controller 102 may be implemented in a single chip. In other examples, they may be implemented separately from the individual chips.

The display 105 is used for interaction between a user and the electronic device 10, and may specifically be, but not limited to, a user inputting an instruction through the display 105, and the display 105 displaying an electronic file.

Referring to fig. 3, fig. 3 is a flowchart illustrating an automatic switching method of a grounding transformer according to an embodiment of the present invention. The automatic switching method of the grounding transformer comprises the following steps:

step S101, detecting the power supply system 20 to obtain a power supply parameter of the power supply system 20.

In the embodiment of the present invention, the power supply parameter may be, but is not limited to, a first current value of a power supply line unit of the power supply module, a second current value of a load unit, a third current value of the section switch, and a first switching state of a main change-down switch of the power supply line unit.

Referring to fig. 4, step S101 may further include the following sub-steps:

in the sub-step S1011, the current of each power supply line is detected to obtain a first current value of each power supply line.

In the first embodiment of the present invention, the first current value may be a current value of the power supply line unit of each power supply module. The power supply circuit can be a circuit for connecting a main transformer change-over switch, a power supply main transformer and a main transformer change-over switch. For example, detecting the current of each power supply line to obtain a first current value of each power supply line may be detecting the current of the first power supply line unit 210 in the first power supply module 21 to obtain the first current value of the first power supply line; detecting the current of the second power supply line unit 230 in the second power supply module 23 to obtain a first current value of the second power supply line; the current of the third power supply line unit 250 in the third power supply module 25 is detected, so as to obtain the first current value of the third power supply line.

In sub-step S1012, the current of each load line is detected to obtain a second current value of each load line.

In the first embodiment of the present invention, the second current value may be a current value of a load line of the load unit of each power supply module. The load line may be a line that connects a plurality of loads and a ground node at the same time, and since each load line simultaneously connects a plurality of loads and a ground node, the current of the load line is the total current, that is, the total current of the current flowing into the plurality of loads and the current flowing into the ground node in the same load unit. For example, detecting the current of each load line to obtain the second current value of each load line may be detecting the current of the first load line of the first load unit 220 in the first power supply module 21 to obtain the second current value of the first load line; detecting the current of the second load line of the second load unit 240 in the second power supply module 23 to obtain a second current value of the second load line; the third load line current of the third load unit 260 in the third power supply module 25 is detected to obtain a second current value of the third load line.

It should be noted that, in other embodiments of the present invention, the execution order of sub-step S1011 and sub-step S1012 may be exchanged, or sub-step S1011 and sub-step S1012 may be executed simultaneously.

Referring to fig. 5, step S101 may further include the following sub-steps:

and a substep S1013 of detecting a switching state of each main-transformer low-voltage switch to obtain a first switching state of each main-transformer low-voltage switch.

In a second embodiment of the invention, the first switching state may be a switching state of a main step-down switch of the power supply line unit of each power supply module, wherein the first switching state comprises open and closed. For example, the detecting the switch state of each main-transformer low-voltage switch to obtain the first switch state of each main-transformer low-voltage switch may be detecting the switch state of the first main-transformer low-voltage switch 213 of the first power supply circuit unit 210 in the first power supply module 21 to obtain the first switch state of the first main-transformer low-voltage switch 213; detecting the switching state of a second main-transformer low-voltage switch 233 of a second power supply circuit unit 230 in the second power supply module 23 to obtain a first switching state of the second main-transformer low-voltage switch 233; the switching state of the third main-transformer low-voltage switch 253 of the third power supply circuit unit 250 in the third power supply module 25 is detected, and the first switching state of the third main-transformer low-voltage switch 253 is obtained.

In sub-step S1014, the current of each load line is detected to obtain a second current value of each load line.

In a second embodiment of the present invention, the second current value may be a current value of a load line of a load unit of each power supply module. The load line may be a line that connects a plurality of loads and a ground node at the same time, and since each load line simultaneously connects a plurality of loads and a ground node, the current of the load line is the total current, that is, the total current of the current flowing into the plurality of loads and the current flowing into the ground node in the same load unit. For example, detecting the current of each load line to obtain the second current value of each load line may be detecting the current of the first load line of the first load unit 220 in the first power supply module 21 to obtain the second current value of the first load line; detecting the current of the second load line of the second load unit 240 in the second power supply module 23 to obtain a second current value of the second load line; the third load line current of the third load unit 260 in the third power supply module 25 is detected to obtain a second current value of the third load line.

It should be noted that, in other embodiments of the present invention, the execution order of sub-step S1013 and sub-step S1014 may be exchanged, or sub-step S1013 and sub-step S1014 may be executed simultaneously.

Referring to fig. 6, step S101 may further include the following sub-steps:

and a substep S1015, detecting the current of each load line to obtain a second current value of each load line.

In the third embodiment of the present invention, the second current value may be a current value of a load line of the load unit of each power supply module. The load line may be a line that connects a plurality of loads and a ground node at the same time, and since each load line simultaneously connects a plurality of loads and a ground node, the current of the load line is the total current, that is, the total current of the current flowing into the plurality of loads and the current flowing into the ground node in the same load unit. For example, detecting the current of each load line to obtain the second current value of each load line may be detecting the current of the first load line of the first load unit 220 in the first power supply module 21 to obtain the second current value of the first load line; detecting the current of the second load line of the second load unit 240 in the second power supply module 23 to obtain a second current value of the second load line; the third load line current of the third load unit 260 in the third power supply module 25 is detected to obtain a second current value of the third load line.

And a substep S1016, detecting the current of each section switch to obtain a third current value of each section switch.

In the third embodiment of the present invention, the third current value may be a current value of each of the segment switches. Detecting the current of each section switch to obtain a third current value of each section switch, which can be understood as detecting the current of the first section switch 22 connected to the first power supply module 21 and the second power supply module 23 to obtain the third current value of the first section switch 22; and detecting the current of a second section switch 24 connecting the second power supply module 23 and the third power supply module 25 to obtain a third current value of the second section switch 24.

It should be noted that in other embodiments of the present invention, the execution order of sub-step S1015 and sub-step S1016 may be exchanged, or sub-step S1015 and sub-step S1016 may be executed simultaneously.

And step S102, judging whether each power supply circuit unit supplies power to the corresponding load unit according to the power supply parameters.

In the embodiment of the present invention, determining whether each power supply line unit supplies power to its corresponding load unit may be understood as determining whether the first power supply line unit 210 supplies power to the first load unit 220, whether the second power supply line unit 230 supplies power to the second load unit 240, and whether the third power supply line unit 250 supplies power to the third load unit 260.

Referring to fig. 7, in step S102 corresponding to the above sub-step S1011 and sub-step S1012, step S102 may further include the following sub-steps:

and a substep S1021, judging whether the power supply line unit supplies power to the corresponding load unit according to the first current value and the second current value.

In the first embodiment of the present invention, the determining whether the power supply line unit supplies power to its corresponding load unit according to the first current value and the second current value may be understood as determining whether the first power supply line unit 210 supplies power to the first load unit 220, whether the second power supply line unit 230 supplies power to the second load unit 240, and whether the third power supply line unit 250 supplies power to the third load unit 260 according to the first current value and the second current value. For example, whether the first power supply line unit 210 supplies power to the first load unit 220 is determined according to a first current value of a first power supply line of the first power supply line unit 210 in the first power supply module 21 and a second current value of a first load line of the first load unit 220 in the first power supply module 21; judging whether the second power supply line unit 230 supplies power to the second load unit 240 according to a first current value of a second power supply line of the second power supply line unit 230 in the second power supply module 23 and a second current value of a second load line of the second load unit 240 in the second power supply module 23; and judging whether the third power supply line unit 250 supplies power to the third load unit 260 according to a first current value of a third power supply line of the third power supply line unit 250 in the third power supply module 25 and a second current value of a third load line of the third load unit 260 in the third power supply module 25.

In the sub-step S1022, when the first current value is not equal to the second current value, it is determined that the power supply line unit does not supply power to the corresponding load unit.

In the first embodiment of the present invention, when the first current value is not equal to the second current value, it is determined that the power supply line unit does not supply power to the corresponding load unit, which may be understood as when the first current value of the first power supply line unit 210 in the first power supply module 21 is not equal to the second current value of the first load line of the first load unit 220 in the first power supply module 21, it is determined that the first power supply line unit 210 does not supply power to the first load unit 220; when the first current value of the second power supply line unit 230 in the second power supply module 23 is not equal to the second current value of the second load line of the second load unit 240 in the second power supply module 23, it is determined that the second power supply line unit 230 does not supply power to the second load unit 240; when the first current value of the third power supply line unit 250 in the third power supply module 25 is not equal to the second current value of the third load line of the third load unit 260 in the third power supply module 25, it is determined that the third power supply line unit 250 does not supply power to the third load unit 260.

Referring to fig. 8, in step S102 corresponding to the above sub-step S1013 and sub-step S1014, step S102 may further include the following sub-steps:

and a substep S1023 of judging whether the power supply circuit unit supplies power to the corresponding load unit or not according to the first switch state and the second current value.

In the second embodiment of the present invention, determining whether the power supply line unit supplies power to its corresponding load unit according to the first switching state and the second current value may be understood as determining whether the first power supply line unit 210 supplies power to the first load unit 220, whether the second power supply line unit 230 supplies power to the second load unit 240, and whether the third power supply line unit 250 supplies power to the third load unit 260 according to the first switching state and the second current value. For example, whether the first power supply line unit 210 supplies power to the first load unit 220 is determined according to a first switching state of the first main variable-low switch 213 of the first power supply line unit 210 in the first power supply module 21 and a second current value of the first load line of the first load unit 220 in the first power supply module 21; judging whether the second power supply line unit 230 supplies power to the second load unit 240 according to a first switching state of a second main variable low-voltage switch 233 of the second power supply line unit 230 in the second power supply module 23 and a second current value of a second load line of the second load unit 240 in the second power supply module 23; and judging whether the third power supply line unit 250 supplies power to the third load unit 260 according to a first switching state of a third main variable low-voltage switch 253 of the third power supply line unit 250 in the third power supply module 25 and a second current value of a third load line of the third load unit 260 in the third power supply module 25.

And a substep S1024, determining that the power supply line unit does not supply power to the corresponding load unit when the first switch is off and the second current value is greater than the first preset current value.

In a second embodiment of the present invention, when the first switch is turned off and the second current value is greater than the first preset current value, it is determined that the power supply line unit does not supply power to the corresponding load unit. The first preset current value may be, but is not limited to, 0, 0.01, 0.05, etc., and the second current value greater than the first preset current value indicates that the load line of the load unit corresponding to the second current value has current. It can be understood that when the first switch state of the first main variable-low switch 213 of the first power supply line unit 210 in the first power supply module 21 is off and the second current value of the first load line of the first load unit 220 in the first power supply module 21 is greater than the first preset current value, it is determined that the first power supply line unit 210 does not supply power to the first load unit 220; when the first switch state of the second main transformer low-voltage switch 233 of the second power supply circuit unit 230 in the second power supply module 23 is off and the second current value of the second load circuit of the second load unit 240 in the second power supply module 23 is greater than the first preset current value, it is determined that the second power supply circuit unit 230 does not supply power to the second load unit 240; when the first switching state of the third main variable low-voltage switch 253 of the third power supply circuit unit 250 in the third power supply module 25 is off and the second current value of the third load circuit of the third load unit 260 in the third power supply module 25 is greater than the first preset current value, it is determined that the third power supply circuit unit 250 does not supply power to the third load unit 260.

Referring to fig. 9, in step S102 corresponding to the above sub-step S1015 and sub-step S1016, step S102 may further include the following sub-steps:

and a sub-step S1025 of determining whether the power supply line unit supplies power to the corresponding load unit according to the second current value and the third current value.

In the third embodiment of the present invention, the determining whether the power supply line unit supplies power to the corresponding load unit according to the second current value and the third current value may be understood as determining whether the first power supply line unit 210 supplies power to the first load unit 220, whether the second power supply line unit 230 supplies power to the second load unit 240, and whether the third power supply line unit 250 supplies power to the third load unit 260 according to the second current value and the third current value. For example, whether the first power supply line unit 210 supplies power to the first load unit 220 is determined according to the second current value of the first load line of the first load unit 220 in the first power supply module 21 and the third current value of the first section switch 22; judging whether the second power supply line unit 230 supplies power to the second load unit 240 according to a second current value of a second load line of the second load unit 240 in the second power supply module 23, a third current value of the first section switch 22 and a third current value of the second section switch 24; and judging whether the third power supply line unit 250 supplies power to the third load unit 260 according to the second current value of the third load line of the third load unit 260 in the third power supply module 25 and the third current value of the second section switch 24.

In the sub-step S1026, when the second current value is equal to the third current value and is greater than the second predetermined current value, it is determined that the power supply line unit does not supply power to the corresponding load unit.

In a third embodiment of the present invention, when the second current value and the third current value are equal to each other and are both greater than the second preset current value, it is determined that the power supply line unit does not supply power to the corresponding load unit. The second preset current value may be, but is not limited to, 0, 0.01, 0.05, etc., and the second current value and the third current value both being greater than the second preset current value indicate that the load line of the load unit corresponding to the second current value has current, and the section switch corresponding to the third current value has current. It can be understood that when the second current value of the first load line of the first load unit 220 in the first power supply module 21 and the third current value of the first section switch 22 are equal and are both greater than the second preset current value, it is determined that the first power supply line unit 210 does not supply power to the first load unit 220; when the second current value of the second load line of the second load unit 240 in the second power supply module 23 is equal to the third current value of the first section switch 22 (or the third current value of the second section switch 24) and is greater than a second preset current value, it is determined that the second power supply line unit 230 does not supply power to the second load unit 240; when the second current value of the third load line of the third load unit 260 in the third power supply module 25 is equal to the third current value of the second section switch 24 and both are greater than the second preset current value, it is determined that the third power supply line unit 250 does not supply power to the third load unit 260.

And step S103, when the target power supply circuit unit is judged not to supply power to the corresponding target load unit, detecting the working mode of the target grounding transformer.

In the embodiment of the present invention, when a power supply line unit does not supply power to its corresponding load unit, the power supply line unit is determined as a target power supply line unit, the load unit corresponding to the target line unit is determined as a target load unit, and a ground fault included in the target load unit is determined as a target ground fault. Since each load unit includes a grounding transformer, the grounding transformer included in the target load unit is identified as the target grounding transformer. For example, if the first power supply line unit 210 does not supply power to the first load unit 220, the first power supply line unit 210 is identified as a target power supply line unit, the first load unit 220 is identified as a target load unit, and the ground fault included in the target load unit is identified as a target ground fault. The working modes of the target grounding transformer comprise a grounding transformer mode, a station transformer mode and a grounding transformer and station transformer mode.

Referring to fig. 10, step S103 may further include the following sub-steps:

and step S1031, detecting the switching state of the target grounding disconnecting link to obtain a second switching state of the target grounding disconnecting link, wherein the second switching state comprises switching-on and switching-off.

In the embodiment of the invention, the grounding switch in the target grounding transformer of the target load unit is confirmed as the target grounding switch. The second switching state may be a switching state of the target earth knife switch, wherein the second switching state includes open and closed. For example, when the first power supply line unit 210 does not supply power to the first load unit 220, the first power supply line unit 210 is determined as a target power supply line unit, the first load unit 220 is determined as a target load unit, the first grounding transformer 221 is determined as a target grounding transformer, the first grounding switch 2213 is determined as a target grounding switch, the switch state of the target grounding switch is detected, and the second switch state of the target grounding switch can be understood as the switch state of the first grounding switch 2213 is detected to obtain the second switch state of the first grounding switch 2213; when the second power supply line unit 230 does not supply power to the second load unit 240, the second power supply line unit 230 is determined as a target power supply line unit, the second load unit 240 is determined as a target load unit, the second grounding transformer 241 is determined as a target grounding transformer, the second grounding disconnecting link 2413 is determined as a target grounding disconnecting link, the switching state of the target grounding disconnecting link is detected, and the second switching state of the target grounding disconnecting link can be understood as detecting the switching state of the second grounding disconnecting link 2413 to obtain the second switching state of the second grounding disconnecting link 2413; when the third power supply line unit 250 does not supply power to the third load unit 260, the third power supply line unit 250 is determined as a target power supply line unit, the third load unit 260 is determined as a target load unit, the third grounding transformer 261 is determined as a target grounding transformer, the third grounding switch 2613 is determined as a target grounding switch, the switching state of the target grounding switch is detected, and the second switching state of the target grounding switch can be understood as the switching state of the third grounding switch 2613 is detected to obtain the second switching state of the third grounding switch 2613.

And a substep S1032 of determining the working mode of the target grounding transformer as the station transformer mode when the second switch state is open.

In the embodiment of the invention, the working modes comprise a grounding transformation mode, a station transformation mode and a grounding transformation and station transformation mode. When the second switching state is open, the operation mode of the target grounding transformer is determined as the station transformer mode, which can be understood as that when the target grounding switch is the first grounding switch 2213, and the switching state of the first grounding switch 2213 is open, the operation mode of the first grounding transformer 221 is determined as the station transformer mode; when the target grounding disconnecting link is the second grounding disconnecting link 2413, and the switching state of the second grounding disconnecting link 2413 is open, determining the working mode of the second grounding transformer 241 as a station transformer mode; when the target grounding switch is the third grounding switch 2613, and the switching state of the third grounding switch 2613 is open, the operation mode of the third grounding transformer 261 is determined as the station transformer mode.

And a substep S1033 of detecting the current of the target grounding transformer to obtain a fourth current value of the target grounding transformer.

In the embodiment of the present invention, the fourth current value may be a current value flowing into the target ground. The step of detecting the current of the target grounding transformer to obtain the fourth current value of the target grounding transformer can be understood as detecting the current flowing into the first grounding transformer 221 to obtain the fourth current value of the first grounding transformer 221 when the target grounding transformer is changed into the first grounding transformer 221; when the target grounding is changed into the second grounding transformer 241, detecting the current flowing into the second grounding transformer 241 to obtain a fourth current value of the second grounding transformer 241; when the target ground is changed to the third ground contact 261, the current flowing into the third ground contact 261 is detected, and a fourth current value of the third ground contact 261 is obtained.

And a substep S1034, determining the operation mode of the target grounding transformer as the grounding transformer and station transformer mode when the fourth current value is larger than the third preset current value.

In the embodiment of the present invention, the third preset current value may be a current threshold value set by a user according to an actual situation, and when the fourth current value is greater than the third preset current value (for example, 5A), the operation mode of the target grounding transformer is determined as the grounding transformer and station transformer mode. It can be understood that, when the target grounding becomes the first grounding transformer 221 and the fourth current value of the first grounding transformer 221 is greater than the third preset current value, the operation mode of the first grounding transformer 221 is determined as the grounding-transformer-station-compatible transformer mode; when the target grounding is changed into the second grounding transformer 241, and the fourth current value of the second grounding transformer 241 is larger than the third preset current value, determining the working mode of the second grounding transformer 241 as a grounding transformer and station transformer mode; when the target grounding is changed into the third grounding transformer 261, and the fourth current value of the third grounding transformer 261 is larger than the third preset current value, the working mode of the third grounding transformer 261 is determined as the grounding transformer and station transformer mode.

And a substep S1035 of determining the operation mode of the target grounding transformer as the grounding transformer mode when the fourth current value is not greater than the preset current value.

In the embodiment of the present invention, when the fourth current value is not greater than (less than or equal to) the third preset current value, the operation mode of the target grounding is determined as the grounding mode. It is understood that, when the target ground is changed to the first ground change 221 and the fourth current value of the first ground change 221 is not greater than the third preset current value, the operation mode of the first ground change 221 is determined as the ground change mode; when the target grounding is changed into the second grounding transformer 241, and the fourth current value of the second grounding transformer 241 is not greater than the third preset current value, determining the working mode of the second grounding transformer 241 as a grounding transformer mode; when the target ground is changed to the third ground contact 261 and the fourth current value of the third ground contact 261 is not greater than the third preset current value, the operation mode of the third ground contact 261 is determined as a ground contact mode.

And step S104, adjusting the connection relation between the target power supply circuit unit and the ground according to the working mode of the target grounding transformer.

In the embodiment of the invention, the target power supply circuit unit is connected with the ground through the target grounding transformer of the target load unit. The connection relation between the target power supply circuit unit and the ground is adjusted according to the working mode of the target grounding transformer, so that the grounding transformer is disconnected when the working mode of the target grounding transformer is a grounding transformer mode, namely the connection between the target power supply circuit unit and the ground is disconnected; when the working mode of the target grounding transformer is a grounding transformer and station transformer mode, disconnecting the grounding transformer, namely disconnecting the target power supply circuit unit from the ground; when the working mode of the target grounding transformer is the station transformer mode, the grounding transformer mode is kept to be changed into the original station transformer mode.

Referring to fig. 11, step S104 may further include the following sub-steps:

in sub-step S1041, when the operation mode of the target earth-fault is the earth-fault mode, the earth-fault high switch of the target earth-fault is controlled to be turned off.

In the embodiment of the invention, when the working mode of the target grounding transformer is the grounding transformer mode, the grounding transformer high switch of the target grounding transformer is controlled to be disconnected, namely, the target power supply line unit is disconnected from the ground. It can be understood that when the target ground becomes the first ground change 221 and the operation mode of the first ground change 221 is the ground change mode, the first ground change high switch 2211 for controlling the first ground change 221 to be disconnected, that is, the connection of the first power supply line unit 210 to the ground is disconnected; when the target grounding is changed into the second grounding transformer 241 and the operation mode of the second grounding transformer 241 is the grounding transformer mode, the second grounding transformer high switch 2411 of the second grounding transformer 241 is controlled to be turned off, namely, the connection of the second power supply line unit 230 and the ground is disconnected; when the target ground is changed to the third ground transition 261 and the operation mode of the third ground transition 261 is the ground transition mode, the third ground transition high switch 2611 controlling the third ground transition 261 is turned off, that is, the third power supply line unit 250 is disconnected from the ground.

And a substep S1042 of controlling the grounding transformer high switch of the target grounding transformer to be opened when the working mode of the target grounding transformer is the grounding transformer and station transformer mode, controlling the target grounding disconnecting link to be opened after time delay, and then controlling the grounding transformer high switch to be closed.

In the embodiment of the invention, when the working mode of the target grounding transformer is the grounding transformer and station transformer mode, the grounding transformer high-switch of the target grounding transformer is controlled to be opened, after time delay, the target grounding disconnecting link is controlled to be opened, and then the grounding transformer high-switch is controlled to be closed. Namely, the working mode of the target grounding transformer is adjusted from the grounding transformer and station transformer mode to the station transformer mode, and the target power supply line unit is disconnected from the ground. It can be understood that, when the target ground is changed to the first ground transformer 221, the operation mode of the first ground transformer 221 is the ground-to-station variable mode, the first ground transformer 221 high switch of the first ground transformer 221 is controlled to be opened, after a time delay, the first ground switch 2213 is controlled to be opened, and the first ground-to-station variable switch 2211 is controlled to be closed, that is, the operation mode of the first ground transformer 221 is adjusted from the ground-to-station variable mode to the station variable mode, and the connection between the first power supply line unit 210 and the ground is disconnected; when the target grounding is changed into the second grounding transformer 241, the working mode of the second grounding transformer 241 is a grounding-to-station variable mode, the second grounding transformer 241 high switch of the second grounding transformer 241 is controlled to be opened, after a delay, the second grounding disconnecting link 2413 is controlled to be opened, and then the second grounding-to-station variable switch 2411 is controlled to be closed, namely, the working mode of the second grounding transformer 241 is adjusted from the grounding-to-station variable mode to the station-to-station variable mode, and the connection between the second power supply line unit 230 and the ground is disconnected; when the target grounding is changed into the third grounding transformer 261, the operation mode of the third grounding transformer 261 is the grounding-transformer-station-sharing-used variable mode, the high switch of the third grounding transformer 261 is controlled to be opened, after time delay, the third grounding disconnecting link 2613 is controlled to be opened, the third grounding-transformer-station-sharing-used variable mode is controlled to be closed, namely, the operation mode of the third grounding transformer 261 is adjusted to be the station-using variable mode from the grounding-transformer-station-sharing-used variable mode, and the third power supply line unit 250 is disconnected from the ground. It should be noted that a certain delay (e.g., 1S) may be added between every two adjacent actions, so as to ensure the safety of the operation.

Referring to fig. 12, fig. 12 is a block diagram illustrating an automatic grounding switching device 300 according to an embodiment of the present invention. The automatic grounding-to-ground switching device 300 includes a parameter detection module 301, a power supply determination module 302, a mode detection module 303, and an execution module 304.

The parameter detecting module 301 is configured to detect the power supply system 20 to obtain a power supply parameter of the power supply system 20.

In this embodiment of the present invention, the parameter detecting module 301 may be configured to execute step S101.

And a power supply determining module 302, configured to determine whether each power supply line unit supplies power to its corresponding load unit according to the power supply parameter.

In this embodiment of the present invention, the power supply determining module 302 may be configured to execute step S102.

And the mode detection module 303 is configured to detect an operating mode of the target ground fault when it is determined that the target power supply line unit does not supply power to the corresponding target load unit.

In this embodiment of the present invention, the mode detection module 303 may be configured to execute step S103.

And the execution module 304 is configured to adjust a connection relationship between the target power supply line unit and the ground according to the operating mode of the target ground fault.

In this embodiment of the present invention, the execution module 304 may be configured to execute step S104.

In summary, according to the automatic switching method and apparatus for a grounding transformer provided by the present invention, firstly, a power supply system is detected to obtain a power supply parameter of the power supply system, secondly, whether each power supply line unit supplies power to its corresponding load unit is determined according to the power supply parameter, then, when it is determined that a target power supply line unit does not supply power to its corresponding target load unit, a working mode of the target grounding transformer is detected, and finally, a connection relationship between the target power supply line unit and ground is adjusted according to the working mode of the target grounding transformer. Compared with the prior art that the connection relation between the power supply circuit unit and the ground is adjusted by disconnecting the grounding transformer or changing the working mode of the grounding transformer by electric power workers, the automatic switching method and the automatic switching device for the grounding transformer automatically adjust the connection relation between the power supply circuit unit and the ground, and improve the operation efficiency.

In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

In addition, the functional modules in the embodiments of the present invention may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.

The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes. It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

Claims (8)

1. The automatic switching method of the grounding transformer is characterized by being used for adjusting the grounding state of a power supply system, wherein the power supply system comprises a plurality of power supply modules which are sequentially and electrically connected, each power supply module comprises a power supply circuit unit and a load unit which is electrically connected with the power supply circuit, and each load unit comprises the grounding transformer; each grounding transformer comprises a grounding transformer high switch, a grounding main transformer, a grounding disconnecting link and a grounding resistor which are electrically connected in sequence, one end of the grounding resistor is electrically connected with the grounding disconnecting link, and the other end of the grounding resistor is connected with the ground; the method comprises the following steps:

detecting the power supply system to obtain power supply parameters of the power supply system;

judging whether each power supply circuit unit supplies power to the corresponding load unit according to the power supply parameters;

when it is judged that a target power supply circuit unit does not supply power to the corresponding target load unit, detecting the working mode of the target grounding transformer; the working modes comprise a grounding transformation mode, a station transformation mode and a grounding transformation and station transformation combined mode;

adjusting the connection relation between the target power supply circuit unit and the ground according to the working mode of the target grounding transformer;

the step of detecting the operating mode of the target grounding transformer when it is determined that the target power supply line unit does not supply power to the target load unit corresponding thereto includes:

detecting the switching state of a target grounding knife switch to obtain a second switching state of the target grounding knife switch, wherein the second switching state comprises switching-on and switching-off;

when the second switch state is open, determining the working mode of the target grounding transformer as a station transformer mode;

detecting the current of the target grounding transformer to obtain a fourth current value of the target grounding transformer;

when the fourth current value is larger than a third preset current value, determining the working mode of the target grounding transformer as a variable mode for the grounding transformer and the station;

when the fourth current value is not larger than a preset current value, determining the working mode of the target grounding transformer as a grounding transformer mode;

the step of adjusting the connection relationship between the target power supply line unit and the ground according to the working mode of the target grounding transformer comprises the following steps:

when the working mode of the target grounding transformer is a grounding transformer mode, controlling the grounding transformer high switch of the target grounding transformer to be switched off;

and when the working mode of the target grounding transformer is a grounding transformer and station transformer mode, controlling the grounding transformer high-voltage switch of the target grounding transformer to be switched off, after time delay, controlling the target grounding disconnecting link to be switched off, and then controlling the grounding transformer high-voltage switch to be switched on.

2. The method of claim 1, wherein the power supply line unit comprises a power supply line, the load unit further comprises a plurality of loads and load lines, the plurality of loads and the ground transformer are electrically connected to the load lines, the power supply parameters comprise a first current value of the power supply line and a second current value of the load line in each power supply module, and the step of detecting the power supply system to obtain the power supply parameters of the power supply system comprises:

detecting the current of each power supply line to obtain a first current value of each power supply line;

and detecting the current of each load circuit to obtain a second current value of each load circuit.

3. The method of claim 2, wherein the step of determining whether each of the power supply line units supplies power to the corresponding load unit according to the power supply parameter comprises:

judging whether the power supply line unit supplies power to the corresponding load unit or not according to the first current value and the second current value;

and when the first current value is not equal to the second current value, judging that the power supply line unit does not supply power to the corresponding load unit.

4. The method of claim 1, wherein the power supply line unit includes a main transformer low-level switch, the load unit further includes a plurality of loads and load lines, the plurality of loads and the ground transformer are electrically connected to the load lines, and the power supply parameters include a first switching state of the main transformer low-level switch and a second current value of the load lines in each power supply module; the step of detecting the power supply system to obtain the power supply parameters of the power supply system comprises the following steps:

detecting the switching state of each main transformer low-level switch to obtain a first switching state of each main transformer low-level switch;

and detecting the current of each load circuit to obtain a second current value of each load circuit.

5. The method of claim 4, wherein the first switch state comprises closed and open; the step of judging whether each power supply circuit unit supplies power to the corresponding load unit according to the power supply parameters comprises the following steps:

judging whether the power supply line unit supplies power to the corresponding load unit or not according to the first switching state and the second current value;

and when the first switch is in a disconnected state and the second current value is larger than a first preset current value, judging that the power supply line unit does not supply power to the corresponding load unit.

6. The method of claim 1, wherein the power supply system further comprises at least one section switch, each section switch is used for connecting two adjacent power supply modules, the load unit further comprises a plurality of loads and load lines, the plurality of loads and the ground contact are electrically connected to the load lines, the power supply parameters comprise a second current value of the load lines in each power supply module and a third current value of the section switch, and the step of detecting the power supply system to obtain the power supply parameters of the power supply system comprises:

detecting the current of each load circuit to obtain a second current value of each load circuit;

and detecting the current of each sectional switch to obtain a third current value of each sectional switch.

7. The method of claim 6, wherein the step of determining whether each of the power supply line units supplies power to the corresponding load unit according to the power supply parameter comprises:

judging whether the power supply line unit supplies power to the corresponding load unit or not according to the second current value and the third current value;

and when the second current value is equal to the third current value and is greater than a second preset current value, determining that the power supply line unit does not supply power to the corresponding load unit.

8. The automatic grounding transformer switching device is characterized by being used for adjusting the grounding state of a power supply system, wherein the power supply system comprises a plurality of power supply modules which are sequentially and electrically connected, each power supply module comprises a power supply circuit unit and a load unit which is electrically connected with the power supply circuit, and each load unit comprises a grounding transformer; each grounding transformer comprises a grounding transformer high switch, a grounding main transformer, a grounding disconnecting link and a grounding resistor which are electrically connected in sequence, one end of the grounding resistor is electrically connected with the grounding disconnecting link, and the other end of the grounding resistor is connected with the ground; the device comprises:

the parameter detection module is used for detecting the power supply system to obtain power supply parameters of the power supply system;

the power supply judging module is used for judging whether each power supply circuit unit supplies power to the corresponding load unit according to the power supply parameters;

the mode detection module is used for detecting the working mode of the target grounding transformer when the target power supply circuit unit is judged not to supply power to the corresponding target load unit; the working modes comprise a grounding transformation mode, a station transformation mode and a grounding transformation and station transformation combined mode;

the execution module is used for adjusting the connection relation between the target power supply circuit unit and the ground according to the working mode of the target grounding transformer;

the mode detection module is further configured to:

detecting the switching state of a target grounding knife switch to obtain a second switching state of the target grounding knife switch, wherein the second switching state comprises switching-on and switching-off;

when the second switch state is open, determining the working mode of the target grounding transformer as a station transformer mode;

detecting the current of the target grounding transformer to obtain a fourth current value of the target grounding transformer;

when the fourth current value is larger than a third preset current value, determining the working mode of the target grounding transformer as a variable mode for the grounding transformer and the station;

when the fourth current value is not larger than a preset current value, determining the working mode of the target grounding transformer as a grounding transformer mode;

the execution module is further configured to:

when the working mode of the target grounding transformer is a grounding transformer mode, controlling the grounding transformer high switch of the target grounding transformer to be switched off;

and when the working mode of the target grounding transformer is a grounding transformer and station transformer mode, controlling the grounding transformer high-voltage switch of the target grounding transformer to be switched off, after time delay, controlling the target grounding disconnecting link to be switched off, and then controlling the grounding transformer high-voltage switch to be switched on.

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