Fault detection method and device for DC circuit breaker

Abstract

The present invention discloses a fault detection method and device for a DC circuit breaker. The method comprises: after receiving a main branch detection signal, controlling multiple branch power devices included in the transfer branch to be in an off state, controlling multiple first power devices corresponding to the first number in the main branch to be in an on state, and controlling multiple second power devices corresponding to the second number in the main branch to be in an off state; responding to a shut-off operation on any one of the first power devices corresponding to the first number, judging whether the main branch current value corresponding to the main branch is zero, and obtaining a first judgment result; and determining whether any one of the first power devices is in a fault state according to the first judgment result. The present invention solves the technical problems of low maintenance efficiency and low maintenance safety existing in the related art.

Description

Technical Field

[0001] The present invention relates to the technical field of equipment detection, and in particular to a fault detection method and device for a DC circuit breaker. Background Art

[0002] Flexible DC transmission projects are in the development and construction stage, and with them come a lot of technical issues and new challenges about new equipment. For example, how to overhaul DC circuit breakers, and overhaul tools will become a device that needs to be developed urgently. At present, the overhaul tools and overhaul methods suitable for new hybrid DC circuit breakers (i.e. DC circuit breakers with main branches and transfer branches) are not safe, and only test some valve groups inside the DC circuit breaker, but fail to test the entire valve tower, resulting in low overhaul efficiency.

[0003] To address the above-mentioned problems, no effective solution has been proposed yet. Summary of the invention

[0004] The embodiments of the present invention provide a fault detection method and device for a DC circuit breaker, so as to at least solve the technical problems of low maintenance efficiency and low maintenance safety existing in the related art.

[0005] According to one aspect of an embodiment of the present invention, a fault detection method for a DC circuit breaker is provided. The DC circuit breaker includes a main branch and a transfer branch. The method includes: after receiving a main branch detection signal, controlling multiple branch power devices included in the transfer branch to be in an off state, controlling multiple first power devices corresponding to a first number in the main branch to be in an on state, and controlling multiple second power devices corresponding to a second number in the main branch to be in an off state; in response to a shutdown operation on any one of the first power devices corresponding to the first number, judging whether a main branch current value corresponding to the main branch is zero, and obtaining a first judgment result; and determining whether any one of the first power devices is in a fault state according to the first judgment result.

[0006] Optionally, the above-mentioned determining whether any one of the above-mentioned first power devices is in a fault state based on the above-mentioned first judgment result includes: if the above-mentioned first judgment result indicates that the above-mentioned main branch current value is not equal to zero, then determining that any one of the above-mentioned first power devices is in a fault state; if the above-mentioned first judgment result indicates that the above-mentioned main branch current value is equal to zero, then determining that any one of the above-mentioned first power devices is not in a fault state.

[0007] Optionally, the transfer branch includes multiple grading areas, and the multiple branch power devices included in the transfer branch are evenly distributed in the multiple grading areas. The method also includes: after receiving the transfer branch detection signal, controlling the multiple first power devices and the multiple second power devices included in the main branch to be in an off state, and controlling the multiple branch power devices included in the transfer branch to be in an on state; in response to the off operation on any branch power device in the target grading area, judging whether the transfer branch current value corresponding to the transfer branch and the partition current value corresponding to the target grading area are zero, and obtaining a second judgment result; determining whether any one of the branch power devices is in a fault state and whether the power devices included in the target grading area are in a fault state according to the second judgment result.

[0008] Optionally, the above-mentioned determining whether any one of the above-mentioned branch power devices is in a fault state and whether the power devices included in the above-mentioned target grading area are in a fault state based on the above-mentioned second judgment result includes: if the above-mentioned second judgment result indicates that the above-mentioned transfer branch current value is equal to zero, then determining that any one of the above-mentioned branch power devices is not in a fault state; if the above-mentioned second judgment result indicates that the above-mentioned partition current value is equal to zero, then determining that the power devices included in the above-mentioned target grading area are in a fault state; if the above-mentioned second judgment result indicates that the transfer branch current value is equal to zero, and the above-mentioned partition current value is equal to zero, then determining that any one of the above-mentioned branch power devices is not in a fault state.

[0009] Optionally, the method further includes: changing the current current flow direction of the DC circuit breaker, and re-controlling the multiple branch power devices included in the transfer branch to be in an off state; controlling the multiple first power devices corresponding to the first number in the main branch to be in an off state, and controlling the multiple second power devices corresponding to the second number in the main branch to be in an on state; responding to the off operation on any one of the second power devices corresponding to the second number, judging whether the main branch current value corresponding to the main branch is zero, and obtaining a third judgment result; and determining whether any one of the second power devices is in a fault state according to the third judgment result.

[0010] Optionally, the above-mentioned determining whether any one of the above-mentioned second power devices is in a fault state based on the above-mentioned third judgment result includes: if the above-mentioned third judgment result indicates that the above-mentioned main branch current value is not equal to zero, then determining that any one of the above-mentioned second power devices is in a fault state; if the above-mentioned third judgment result indicates that the above-mentioned main branch current value is equal to zero, then determining that any one of the above-mentioned second power devices is not in a fault state.

[0011] Optionally, the method further includes: before receiving the main branch detection signal, determining that the input voltage value of the DC circuit breaker is a maintenance voltage value, and the input current value of the DC circuit breaker is a maintenance current value.

[0012] According to another aspect of an embodiment of the present invention, a fault detection device for a DC circuit breaker is also provided. The DC circuit breaker includes a main branch and a transfer branch. The device includes: a control module, which is used to control multiple branch power devices included in the transfer branch to be in an off state, control multiple first power devices corresponding to a first number in the main branch to be in an on state, and control multiple second power devices corresponding to a second number in the main branch to be in an off state after receiving a main branch detection signal; a judgment module, which is used to respond to a shutdown operation on any one of the first power devices corresponding to the first number, judge whether the main branch current value corresponding to the main branch is zero, and obtain a first judgment result; and a determination module, which is used to determine whether any one of the first power devices is in a fault state according to the first judgment result.

[0013] According to another aspect of an embodiment of the present invention, a non-volatile storage medium is provided. The non-volatile storage medium stores a plurality of instructions. The instructions are suitable for being loaded by a processor and executing any one of the above-mentioned DC circuit breaker fault detection methods.

[0014] According to another aspect of an embodiment of the present invention, there is further provided an electronic device, comprising one or more processors and a memory, wherein the memory is used to store one or more programs, wherein when the one or more programs are executed by the one or more processors, the one or more processors implement any one of the above-mentioned DC circuit breaker fault detection methods.

[0015] In an embodiment of the present invention, a fault detection method of a DC circuit breaker is adopted. After receiving a main branch detection signal, multiple branch power devices included in the transfer branch are controlled to be in an off state, multiple first power devices corresponding to the first number in the main branch are controlled to be in an on state, and multiple second power devices corresponding to the second number in the main branch are controlled to be in an off state; in response to a shutdown operation on any one of the first power devices corresponding to the first number, it is determined whether the main branch current value corresponding to the main branch is zero, and a first judgment result is obtained; and it is determined whether any one of the first power devices is in a fault state according to the first judgment result, thereby achieving the purpose of determining the fault location by controlling the on state of the power device in the DC circuit breaker, thereby achieving the technical effect of improving fault detection efficiency and equipment maintenance safety, and further solving the technical problems of low maintenance efficiency and low maintenance safety existing in the related technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 is a flow chart of a fault detection method for a high-voltage DC circuit breaker according to an embodiment of the present invention;

[0018] Figure 2 is a schematic structural diagram of an optional DC circuit breaker according to an embodiment of the present invention;

[0019] Figure 3 is a front schematic diagram of an optional DC circuit breaker maintenance cabinet according to an embodiment of the present invention;

[0020] Figure 4 is a schematic diagram of the back side of an optional DC circuit breaker maintenance cabinet according to an embodiment of the present invention;

[0021] Figure 5 is a schematic diagram of an optional internal circuit structure of a DC circuit breaker maintenance cabinet according to an embodiment of the present invention;

[0022] Figure 6 is a diagram of an optional method for connecting a DC circuit breaker to a maintenance cabinet according to an embodiment of the present invention;

[0023] Figure 7 It is a structural schematic diagram of a fault detection device for a DC circuit breaker according to an embodiment of the present invention. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0025] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0026] According to an embodiment of the present invention, a method embodiment for fault detection of a DC circuit breaker is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0027] Figure 1 is a flow chart of a fault detection method of a DC circuit breaker according to an embodiment of the present invention, wherein the DC circuit breaker includes a main branch and a transfer branch, such as Figure 1 As shown, the method comprises the following steps:

[0028] Step S102, after receiving the main branch detection signal, controlling the multiple branch power devices included in the transfer branch to be in an off state, controlling the multiple first power devices corresponding to the first number in the main branch to be in an on state, and controlling the multiple second power devices corresponding to the second number in the main branch to be in an off state;

[0029] Step S104, in response to a shutdown operation on any one of the first power devices corresponding to the first number, determining whether a main branch current value corresponding to the main branch is zero, and obtaining a first determination result;

[0030] Step S106: determining whether any one of the first power devices is in a fault state according to the first judgment result.

[0031] Optionally, the DC circuit breaker includes a main branch and a transfer branch, such as Figure 2As shown, the main branch and the transfer branch of the DC circuit breaker include a plurality of power devices, and the power devices may be, but are not limited to, transistors. It can be understood that the DC circuit breaker may be, but are not limited to, a high-voltage DC circuit breaker, and the branch power devices are insulated gate bipolar power devices (IGBT devices, Insulated Gate Bipolar Transistor) located in the transfer branch of the DC circuit breaker; the first power device and the second power device are IGBT devices located in the main branch of the DC circuit breaker. Among them, the first power device and the second power device correspond to different numbering forms, for example, the first power device is an IGBT device numbered in the form of 2n-1 (n=1, 2, 3....N) in the main branch, and the first power device is an IGBT device numbered in the form of 2n-1 (n=1, 2, 3....N) in the main branch.

[0032] Optionally, before receiving the main branch detection signal, it is determined that the input voltage value of the DC circuit breaker is a maintenance voltage value, and the input current value of the DC circuit breaker is a maintenance current value.

[0033] In an embodiment of the present invention, a fault detection method of a DC circuit breaker is adopted. After receiving a main branch detection signal, multiple branch power devices included in the transfer branch are controlled to be in an off state, multiple first power devices corresponding to the first number in the main branch are controlled to be in an on state, and multiple second power devices corresponding to the second number in the main branch are controlled to be in an off state; in response to a shutdown operation on any one of the first power devices corresponding to the first number, it is determined whether the main branch current value corresponding to the main branch is zero, and a first judgment result is obtained; and it is determined whether any one of the first power devices is in a fault state according to the first judgment result, thereby achieving the purpose of determining the fault location by controlling the on state of the power device in the DC circuit breaker, thereby achieving the technical effect of improving fault detection efficiency and equipment maintenance safety, and further solving the technical problems of low maintenance efficiency and low maintenance safety existing in the related technology.

[0034] Optionally, the DC circuit breaker fault detection method provided in the embodiment of the present invention can be applied to Figures 3 to 5The DC circuit breaker maintenance cabinet shown in the figure is composed of a control display screen, a voltage and current display meter, a voltage and current adjustment button, an optical fiber interface with a DC circuit breaker control panel, a power supply input interface, a DC power supply output interface, and a loop master switch. Before performing fault detection on the DC circuit breaker, the DC power supply is connected to the high-voltage DC circuit breaker, wherein the positive and negative terminals of the DC power supply output are respectively connected to the two terminals of the DC circuit breaker, and the optical fiber interface of the DC circuit breaker maintenance cabinet is connected to the test optical fiber interface of the DC circuit breaker control cabinet using the spare optical fiber of the DC circuit breaker valve tower.

[0035] Optionally, at the beginning of maintenance, first adjust the current adjustment knob in the DC circuit breaker maintenance cabinet to the minimum current position, and adjust the voltage adjustment knob to the minimum voltage position, that is, use the minimum current value and the minimum voltage value as the current input signal, open the main circuit switch, send a command through the control display screen, and transfer it to the DC circuit breaker control cabinet through the optical fiber to make the DC circuit breaker control cabinet (that is, the above-mentioned DC circuit breaker) output the insulated gate bipolar power device (IGBT, Insulated Gate Bipolar Transistor) shutdown signal, close the fast mechanical switch, so that the IGBT devices in the DC circuit breaker are all turned off, and the fast mechanical switches are all closed. Then, by adjusting the voltage knob in the DC circuit breaker maintenance cabinet (still as Figure 3 As shown in the figure, set the input voltage value of the DC circuit breaker to the maintenance voltage value, and then adjust the current knob in the DC circuit breaker maintenance cabinet to set the input current value of the DC circuit breaker to the maintenance current value.

[0036] Optionally, the above-mentioned determining whether any one of the above-mentioned first power devices is in a fault state based on the above-mentioned first judgment result includes: if the above-mentioned first judgment result indicates that the above-mentioned main branch current value is not equal to zero, then determining that any one of the above-mentioned first power devices is in a fault state; if the above-mentioned first judgment result indicates that the above-mentioned main branch current value is equal to zero, then determining that any one of the above-mentioned first power devices is not in a fault state.

[0037] As an optional embodiment, after receiving the main branch detection signal, it is detected whether the IGBT device (i.e., the first power device) configured in the same direction as the current in the main branch is in a fault state, and a command is issued to the DC circuit breaker through the DC circuit breaker maintenance cabinet, so that the optical fiber heads connected to the IGBT devices of the transfer branch all output shutdown signals, that is, the multiple branch power devices included in the transfer branch are controlled to be in the shutdown state; the optical fiber heads connected to the main branch IGBT devices output different signals, that is, the multiple first power devices corresponding to the first number in the main branch are controlled to be in the on state, and the multiple second power devices corresponding to the second number in the main branch are controlled to be in the off state, that is, the control number is 2n-1( n=1, 2, 3....N) (i.e., the first power device) is in the on state, and the IGBT device numbered 2n (n=1, 2, 3....N) (i.e., the second power device) is in the off state; the first power device numbered 1 is in the off state, and the first power devices with other numbers are in the on state; the main circuit current probe CT(m+1) is used to measure whether there is current in the main branch. If there is current in the main branch, that is, the main branch current value is not zero, it is determined that the first power device numbered 1 is in a fault state; if there is no current in the main branch, that is, the main branch current value is zero, it is determined that the first power device numbered 1 is not in a fault state. By analogy, the numbers of all the IGBT devices in the fault state in the numbered 2n-1 (n=1, 2, 3....N) are obtained, and the test results are recorded in the control display screen of the DC circuit breaker maintenance cabinet.

[0038] In an optional embodiment, the transfer branch includes a plurality of hierarchical regions, and the plurality of branch power devices included in the transfer branch are evenly distributed in the plurality of hierarchical regions, and the method further includes:

[0039] After receiving the transfer branch detection signal, controlling the plurality of first power devices and the plurality of second power devices included in the main branch to be in an off state, and controlling the plurality of branch power devices included in the transfer branch to be in an on state;

[0040] In response to a shutdown operation on any branch power device in the target classification area, determining whether a transfer branch current value corresponding to the transfer branch and a partition current value corresponding to the target classification area are zero, and obtaining a second determination result;

[0041] It is determined whether any one of the branch power devices is in a fault state and whether the power devices included in the target classification area are in a fault state according to the second judgment result.

[0042] Optionally, the above-mentioned determining whether any one of the above-mentioned branch power devices is in a fault state and whether the power devices included in the above-mentioned target grading area are in a fault state based on the above-mentioned second judgment result includes: if the above-mentioned second judgment result indicates that the above-mentioned transfer branch current value is equal to zero, then determining that any one of the above-mentioned branch power devices is not in a fault state; if the above-mentioned second judgment result indicates that the above-mentioned partition current value is equal to zero, then determining that the power devices included in the above-mentioned target grading area are in a fault state; if the above-mentioned second judgment result indicates that the transfer branch current value is equal to zero, and the above-mentioned partition current value is equal to zero, then determining that any one of the above-mentioned branch power devices is not in a fault state.

[0043] Optional, such as Figure 6 As shown, after detecting the IGBT device (i.e., the first power device) configured in the same direction as the current in the main branch, it is started to detect whether the IGBT device in the transfer branch is in a fault state, and whether the diodes included in the multiple graded areas corresponding to the transfer branch are in a fault state; a command is sent to the DC circuit breaker control panel through the DC circuit breaker maintenance cabinet, so that the optical fiber heads connected to the IGBT of the main branch all output shutdown signals, that is, control the multiple first power devices and the multiple second power devices included in the above-mentioned main branch to be in the shutdown state, and the optical fiber heads connected to the transfer branch IGBT output different signals, that is, control the numbered IGBTs in the transfer branch. The branch power device with number 1 is in the off state, and the other branch power devices are in the on state. If the transfer branch current probe CT(m+2) detects that there is no current in the transfer branch, it is determined that the branch power device with number 1 is not in a fault state; if the main branch current probe CT(m+1) detects that there is current in the main branch, and the graded current probe CT1 in the graded area (i.e. graded area 1) where the branch power device with number 1 is located detects that there is no current in the graded area, then the diode in the graded area 1 is in a fault state. If CT(m+1) and CT1 both detect current, it is determined that the branch power device with number 1 is in a fault state. By analogy, the IGBT device numbers in the faulty state on all transfer branches and the graded area to which the diodes in the faulty state belong are obtained, and the test results are recorded in the control display screen of the DC circuit breaker maintenance cabinet.

[0044] In an optional embodiment, the above method further includes:

[0045] Changing the current flow direction of the DC circuit breaker, re-controlling the multiple branch power devices included in the transfer branch to be in the off state; controlling the multiple first power devices corresponding to the first number in the main branch to be in the off state, and controlling the multiple second power devices corresponding to the second number in the main branch to be in the on state;

[0046] In response to a shut-down operation on any one of the second power devices corresponding to the second number, determining whether a main branch current value corresponding to the main branch is zero, and obtaining a third determination result;

[0047] It is determined whether any one of the second power devices is in a fault state according to the third judgment result.

[0048] Optionally, the above-mentioned determining whether any one of the above-mentioned second power devices is in a fault state based on the above-mentioned third judgment result includes: if the above-mentioned third judgment result indicates that the above-mentioned main branch current value is not equal to zero, then determining that any one of the above-mentioned second power devices is in a fault state; if the above-mentioned third judgment result indicates that the above-mentioned main branch current value is equal to zero, then determining that any one of the above-mentioned second power devices is not in a fault state.

[0049] Optionally, before changing the current flow direction of the DC circuit breaker, a command is sent to the DC circuit breaker through the DC circuit breaker maintenance cabinet to control the shutdown of all IGBT devices. The current knob is adjusted to the minimum current position, the voltage knob is adjusted to the minimum voltage position, and the main switch is turned off.

[0050] Optionally, the positive and negative output lines of the DC power supply are swapped and connected on both sides of the circuit breaker to change the current current flow direction of the above-mentioned DC circuit breaker, and the IGBG device (i.e., the second power device) corresponding to the second number 2n (n=1, 2, 3....N) of the main branch is tested. This process is consistent with the above-mentioned detection of whether the first power device is in a fault state, and will not be repeated here. According to the above-mentioned method steps for detecting the first power device, the number of the IGBG device in the fault state corresponding to the second number 2n (n=1, 2, 3....N) of the main branch and the graded area to which the diode failure belongs can be obtained.

[0051] In an optional embodiment, the above method further includes:

[0052] Before receiving the main branch detection signal, it is determined that the input voltage value of the DC circuit breaker is a maintenance voltage value, and the input current value of the DC circuit breaker is a maintenance current value.

[0053] Optionally, before determining that the input voltage value of the DC circuit breaker is the inspection voltage value and the input current value of the DC circuit breaker is the inspection current value, first adjust the current adjustment knob in the DC circuit breaker inspection cabinet to the minimum current position and the voltage adjustment knob to the minimum voltage position, that is, use the minimum current value and the minimum voltage value as the current input signal, open the main circuit switch, send a command through the control display screen, and transfer it to the DC circuit breaker control cabinet through the optical fiber so that the DC circuit breaker control cabinet (that is, the DC circuit breaker) outputs an insulated gate bipolar power device (IGBT device, InsulatedGate Bipolar Transistor) shutdown signal, close the fast mechanical switch, so that the IGBT devices in the DC circuit breaker are all turned off and the fast mechanical switches are all closed. Then, the input voltage value of the DC circuit breaker is set to the inspection voltage value by adjusting the voltage knob in the DC circuit breaker inspection cabinet, and then the input current value of the DC circuit breaker is set to the inspection current value by adjusting the current knob in the DC circuit breaker inspection cabinet.

[0054] As an optional embodiment, the present invention provides a fault detection method for a DC circuit breaker, the method is applied to Figures 3 to 5The DC circuit breaker maintenance cabinet shown in the figure comprises: before the maintenance test, connecting the DC power supply, connecting the positive and negative output lines of the DC power supply to the two sides of the DC circuit breaker respectively, connecting the optical fiber interface of the DC circuit breaker maintenance cabinet to the test optical fiber interface of the DC circuit breaker control cabinet using the spare optical fiber of the DC circuit breaker valve tower; when the maintenance starts, firstly adjusting the current adjustment knob to the minimum current position, adjusting the voltage adjustment knob to the minimum voltage position, turning on the main circuit switch, sending a command through the control display screen to the DC circuit breaker control cabinet through the optical fiber, so that the DC circuit breaker control cabinet outputs an IGBT device shutdown signal, closing the fast mechanical switch, so that all IGBTs in the DC circuit breaker are shut down, and all fast mechanical switches are closed, then adjusting the voltage knob to the maintenance voltage value, and then adjusting the current knob to the maintenance current value; starting to detect whether the IGBT device (i.e., the first power device) configured in the same direction as the current in the main branch is in a fault state, and through the DC circuit breaker maintenance The cabinet sends a command to the DC circuit breaker control panel, and finally records the test results on the control display screen of the DC circuit breaker maintenance cabinet; start to detect whether the IGBT devices in the transfer branch and the diodes included in multiple classification areas are in a fault state, and send a command to the DC circuit breaker control panel through the DC circuit breaker maintenance cabinet, and finally record the test results on the control display screen of the DC circuit breaker maintenance cabinet; after the test, the DC circuit breaker maintenance cabinet outputs control to the DC circuit breaker control panel to turn off all IGBTs, adjust the current knob to the minimum current position, adjust the voltage knob to the minimum voltage position, and turn off the main switch of the DC circuit breaker maintenance cabinet; swap the positive and negative DC power supply lines and connect them on both sides of the DC circuit breaker, and repeat the above process to obtain the positions of all IGBT failures and the classification areas to which the diodes fail; after the test, send a command to the DC circuit breaker control panel through the DC circuit breaker maintenance cabinet to open the fast mechanical switch.

[0055] In this embodiment, a fault detection device for a DC circuit breaker is also provided, which is used to implement the above-mentioned embodiments and preferred implementation modes, and the descriptions that have been made will not be repeated. As used below, the terms "module" and "device" can implement a combination of software and / or hardware for a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceivable.

[0056] According to an embodiment of the present invention, there is also provided an embodiment of a device for implementing the above-mentioned DC circuit breaker fault detection method. Figure 7 is a schematic structural diagram of a fault detection device for a DC circuit breaker according to an embodiment of the present invention. Figure 7 As shown, the DC circuit breaker includes a main branch and a transfer branch, and the fault detection device of the DC circuit breaker includes: a control module 700, a judgment module 702, and a determination module 704, wherein:

[0057] The control module 700 is used to control the multiple branch power devices included in the transfer branch to be in an off state after receiving the main branch detection signal, control the multiple first power devices corresponding to the first number in the main branch to be in an on state, and control the multiple second power devices corresponding to the second number in the main branch to be in an off state;

[0058] The judgment module 702 is connected to the control module 700 and is used to respond to the shutdown operation of any one of the first power devices corresponding to the first number, judge whether the main branch current value corresponding to the main branch is zero, and obtain a first judgment result;

[0059] The determination module 704 is connected to the judgment module 702 and is used to determine whether any one of the first power devices is in a fault state according to the first judgment result.

[0060] In an embodiment of the present invention, the control module 700 is set to control the multiple branch power devices included in the transfer branch to be in an off state, control the multiple first power devices corresponding to the first number in the main branch to be in an on state, and control the multiple second power devices corresponding to the second number in the main branch to be in an off state after receiving the main branch detection signal; the judgment module 702 is connected to the control module 700 and is used to respond to the off operation of any one of the first power devices corresponding to the first number, judge whether the main branch current value corresponding to the main branch is zero, and obtain a first judgment result; the determination module 704 is connected to the judgment module 702 and is used to determine whether any one of the first power devices is in a fault state according to the first judgment result, thereby achieving the purpose of determining the fault location by controlling the on state of the power device in the DC circuit breaker, thereby achieving the technical effect of improving the fault detection efficiency and the safety of equipment maintenance, and further solving the technical problems of low maintenance efficiency and low maintenance safety existing in the related technology.

[0061] It should be noted that the above modules can be implemented by software or hardware. For example, for the latter, it can be implemented in the following ways: the above modules can be located in the same processor; or the above modules can be located in different processors in any combination.

[0062] It should be noted that the control module 700, the judgment module 702, and the determination module 704 correspond to steps S102 to S106 in the embodiment, and the examples and application scenarios implemented by the modules and the corresponding steps are the same, but are not limited to the contents disclosed in the embodiment. It should be noted that the modules as part of the device can be run in a computer terminal.

[0063] It should be noted that the optional or preferred implementation of this embodiment can refer to the relevant description in the embodiment, which will not be repeated here.

[0064] The above-mentioned DC circuit breaker fault detection device may also include a processor and a memory. The above-mentioned control module 700, judgment module 702, determination module 704, etc. are all stored in the memory as program modules, and the processor executes the above-mentioned program modules stored in the memory to implement corresponding functions.

[0065] The processor includes a kernel, which retrieves the corresponding program module from the memory. The kernel may be one or more. The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. The memory includes at least one memory chip.

[0066] According to an embodiment of the present application, an embodiment of a non-volatile storage medium is also provided. Optionally, in this embodiment, the non-volatile storage medium includes a stored program, wherein when the program is executed, the device where the non-volatile storage medium is located is controlled to execute any one of the DC circuit breaker fault detection methods.

[0067] Optionally, in this embodiment, the non-volatile storage medium may be located in any computer terminal in a computer terminal group in a computer network, or in any mobile terminal in a mobile terminal group, and the non-volatile storage medium includes a stored program.

[0068] Optionally, when the program is running, the device where the non-volatile storage medium is located is controlled to perform the following functions: after receiving the main branch detection signal, the multiple branch power devices included in the above-mentioned transfer branch are controlled to be in an off state, the multiple first power devices corresponding to the first number in the above-mentioned main branch are controlled to be in an on state, and the multiple second power devices corresponding to the second number in the above-mentioned main branch are controlled to be in an off state; in response to the shutdown operation on any one of the first power devices corresponding to the above-mentioned first number, it is determined whether the main branch current value corresponding to the above-mentioned main branch is zero, and a first judgment result is obtained; and it is determined whether any one of the above-mentioned first power devices is in a fault state according to the above-mentioned first judgment result.

[0069] Optionally, when the program is running, the device where the non-volatile storage medium is located is controlled to perform the following functions: if the above-mentioned first judgment result indicates that the above-mentioned main branch current value is not equal to zero, it is determined that any one of the above-mentioned first power devices is in a fault state; if the above-mentioned first judgment result indicates that the above-mentioned main branch current value is equal to zero, it is determined that any one of the above-mentioned first power devices is not in a fault state.

[0070] Optionally, when the program is running, the device where the non-volatile storage medium is located is controlled to perform the following functions: after receiving the transfer branch detection signal, the multiple first power devices and the multiple second power devices included in the main branch are controlled to be in an off state, and the multiple branch power devices included in the transfer branch are controlled to be in an on state; in response to a shutdown operation on any branch power device in the target grading area, it is determined whether the transfer branch current value corresponding to the transfer branch and the partition current value corresponding to the target grading area are zero, and a second judgment result is obtained; based on the second judgment result, it is determined whether any one of the branch power devices is in a fault state, and whether the power devices included in the target grading area are in a fault state.

[0071] Optionally, when the program is running, the device where the non-volatile storage medium is located is controlled to perform the following functions: if the second judgment result indicates that the transfer branch current value is equal to zero, it is determined that any one of the branch power devices is not in a fault state; if the second judgment result indicates that the partition current value is equal to zero, it is determined that the power devices included in the target grading area are in a fault state; if the second judgment result indicates that the transfer branch current value is equal to zero and the partition current value is equal to zero, it is determined that any one of the branch power devices is not in a fault state.

[0072] Optionally, when the program is running, the device where the non-volatile storage medium is located is controlled to perform the following functions: changing the current current flow direction of the above-mentioned DC circuit breaker, and re-controlling the multiple branch power devices included in the above-mentioned transfer branch to be in the off state; controlling the multiple first power devices corresponding to the first number in the above-mentioned main branch to be in the off state, and controlling the multiple second power devices corresponding to the second number in the above-mentioned main branch to be in the on state; in response to the shutdown operation on any one of the second power devices corresponding to the above-mentioned second number, judging whether the main branch current value corresponding to the above-mentioned main branch is zero, and obtaining a third judgment result; determining whether any one of the above-mentioned second power devices is in a fault state according to the above-mentioned third judgment result.

[0073] Optionally, when the program is running, the device where the non-volatile storage medium is located is controlled to perform the following functions: if the third judgment result indicates that the main branch current value is not equal to zero, it is determined that any one of the second power devices is in a fault state; if the third judgment result indicates that the main branch current value is equal to zero, it is determined that any one of the second power devices is not in a fault state.

[0074] Optionally, when the program is running, the device where the non-volatile storage medium is located is controlled to perform the following functions: before receiving the above-mentioned main branch detection signal, determine that the input voltage value of the above-mentioned DC circuit breaker is a maintenance voltage value, and the input current value of the above-mentioned DC circuit breaker is a maintenance current value.

[0075] According to an embodiment of the present application, an embodiment of a computer program product is also provided. When executed on a data processing device, the computer program product is suitable for executing a program that initializes any of the steps of the above-mentioned DC circuit breaker fault detection method.

[0076] Optionally, the above-mentioned computer program product, when executed on a data processing device, is suitable for executing a program initialized with the following method steps: after receiving a main branch detection signal, controlling multiple branch power devices included in the above-mentioned transfer branch to be in an off state, controlling multiple first power devices corresponding to the first number in the above-mentioned main branch to be in an on state, and controlling multiple second power devices corresponding to the second number in the above-mentioned main branch to be in an off state; in response to a shutdown operation on any one of the first power devices corresponding to the above-mentioned first number, judging whether the main branch current value corresponding to the above-mentioned main branch is zero, and obtaining a first judgment result; determining whether any one of the above-mentioned first power devices is in a fault state according to the above-mentioned first judgment result.

[0077] According to an embodiment of the present invention, an electronic device is also provided, which includes a processor, a memory, and a program stored in the memory and executable on the processor. When the processor executes the program, the following steps are implemented: after receiving a main branch detection signal, multiple branch power devices included in the transfer branch are controlled to be in an off state, multiple first power devices corresponding to the first number in the main branch are controlled to be in an on state, and multiple second power devices corresponding to the second number in the main branch are controlled to be in an off state; in response to a shutdown operation on any one of the first power devices corresponding to the first number, it is determined whether the main branch current value corresponding to the main branch is zero to obtain a first judgment result; and it is determined whether any one of the first power devices is in a fault state according to the first judgment result.

[0078] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0079] In the above embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0080] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the modules can be a logical function division. There may be other division methods in actual implementation, such as multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, modules or indirect coupling or communication connection of modules, which can be electrical or other forms.

[0081] The modules described as separate components may or may not be physically separated, and the components shown as modules may or may not be physical modules, that is, they may be located in one place or distributed on multiple modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present embodiment.

[0082] In addition, each functional module in each embodiment of the present invention may be integrated into one processing module, or each module may exist physically separately, or two or more modules may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of software functional modules.

[0083] If the integrated module is implemented in the form of a software function module and sold or used as an independent product, it can be stored in a computer-readable non-volatile storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a non-volatile storage medium, including a number of instructions to enable a computer device (which can be a personal computer, server or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned non-volatile storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, disk or optical disk and other media that can store program codes.

[0084] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A DC circuit breaker fault detection method, characterized in that: The DC circuit breaker comprises a main branch and a transfer branch, and the method comprises: After receiving the main branch detection signal, control the multiple branch power devices included in the transfer branch to be in an off state, control the multiple first power devices corresponding to the first number in the main branch to be in an on state, and control the multiple second power devices corresponding to the second number in the main branch to be in an off state; In response to a shutdown operation on any one of the first power devices corresponding to the first number, determining whether a main branch current value corresponding to the main branch is zero, and obtaining a first determination result; Determine whether any one of the first power devices is in a fault state according to the first judgment result; Wherein, the transfer branch includes multiple grading areas, and the multiple branch power devices included in the transfer branch are evenly distributed in the multiple grading areas. The method also includes: after receiving the transfer branch detection signal, controlling the multiple first power devices and the multiple second power devices included in the main branch to be in an off state, and controlling the multiple branch power devices included in the transfer branch to be in an on state; in response to the off operation on any branch power device in the target grading area, judging whether the transfer branch current value corresponding to the transfer branch and the partition current value corresponding to the target grading area are zero, and obtaining a second judgment result; determining whether any branch power device is in a fault state and whether the diode included in the target grading area is in a fault state according to the second judgment result.

2. The method according to claim 1, characterized in that The determining, according to the first judgment result, whether any one of the first power devices is in a fault state comprises: If the first judgment result indicates that the main branch current value is not equal to zero, it is determined that any one of the first power devices is in a fault state; If the first judgment result indicates that the main branch current value is equal to zero, it is determined that any one of the first power devices is not in a fault state.

3. The method according to claim 1, characterized in that The determining, according to the second judgment result, whether any one of the branch power devices is in a fault state, and whether the diode included in the target classification area is in a fault state, includes: If the second judgment result indicates that the transfer branch current value is equal to zero, it is determined that any one of the branch power devices is not in a fault state; If the second judgment result indicates that the transfer branch current value is not equal to zero, and if the second judgment result indicates that the partition current value is equal to zero, then determining that the diode included in the target grading area is in a fault state; If the second judgment result indicates that the transfer branch current value is not equal to zero, and the partition current value is not equal to zero, it is determined that any one of the branch power devices is in a fault state.

4. The method according to claim 1, characterized in that The method further comprises: Changing the current flow direction of the DC circuit breaker, re-controlling the multiple branch power devices included in the transfer branch to be in the off state; controlling the multiple first power devices corresponding to the first number in the main branch to be in the off state, and controlling the multiple second power devices corresponding to the second number in the main branch to be in the on state; In response to a shut-down operation on any one of the second power devices corresponding to the second number, determining whether a main branch current value corresponding to the main branch is zero, and obtaining a third determination result; It is determined whether any one of the second power devices is in a fault state according to the third judgment result.

5. The method according to claim 4, characterized in that The determining, according to the third judgment result, whether any one of the second power devices is in a fault state comprises: If the third judgment result indicates that the main branch current value is not equal to zero, it is determined that any one of the second power devices is in a fault state; If the third judgment result indicates that the main branch current value is equal to zero, it is determined that any one of the second power devices is not in a fault state.

6. The method according to any one of claims 1 to 5, characterized in that The method further comprises: Before receiving the main branch detection signal, it is determined that the input voltage value of the DC circuit breaker is a maintenance voltage value, and the input current value of the DC circuit breaker is a maintenance current value.

7. A fault detection device for a DC circuit breaker, characterized in that: The DC circuit breaker includes a main branch and a transfer branch, and the device includes: A control module, configured to, after receiving a main branch detection signal, control a plurality of branch power devices included in the transfer branch to be in an off state, control a plurality of first power devices corresponding to a first number in the main branch to be in an on state, and control a plurality of second power devices corresponding to a second number in the main branch to be in an off state; a judgment module, configured to respond to a shutdown operation on any one of the first power devices corresponding to the first number, judge whether a main branch current value corresponding to the main branch is zero, and obtain a first judgment result; a determination module, configured to determine whether any one of the first power devices is in a fault state according to the first judgment result; The device is also used for: after receiving a transfer branch detection signal, controlling the multiple first power devices and the multiple second power devices included in the main branch to be in an off state, and controlling the multiple branch power devices included in the transfer branch to be in an on state; in response to a shutdown operation on any branch power device in a target grading area, judging whether a transfer branch current value corresponding to the transfer branch and a partition current value corresponding to the target grading area are zero, and obtaining a second judgment result; determining whether any one of the branch power devices is in a fault state and whether the diode included in the target grading area is in a fault state according to the second judgment result.

8. A non-volatile storage medium, characterized in that: The non-volatile storage medium stores a plurality of instructions, and the instructions are suitable for being loaded by a processor and executing the fault detection method for a DC circuit breaker according to any one of claims 1 to 6.

9. An electronic device, characterized in that: It comprises one or more processors and a memory, wherein the memory is used to store one or more programs, wherein when the one or more programs are executed by the one or more processors, the one or more processors implement the fault detection method for a DC circuit breaker according to any one of claims 1 to 6.

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