KR20230164496A - Electronic device for determining ground fault of power line using rcd circuit and imd circuit and operating method thereof - Google Patents

Abstract

In the electronic device for determining a ground fault of a power line connected to a DC/AC power converter that outputs a converter status signal indicating whether the converter is in operation to a control circuit according to various embodiments of the present application, it is connected to the power line and determines whether the converter is in operation. A DC/AC power converter that outputs a converter status signal representing to a control circuit; an IMD circuit connected to one end of the DC/AC power converter and outputting a signal indicating the insulation state of the power line to a control circuit; an RCD circuit connected to the other end of the DC/AC power converter and outputting a signal for determining whether a leakage current in the power line exists to a control circuit; and a control circuit connected to the DC/AC power converter, the IMD circuit, and the RCD circuit, wherein the control circuit: operates the power converter based on a converter status signal received from the DC/AC power converter. If it is confirmed that the power converter is operating based on the converter status signal, determine whether the power line is grounded using the signal received from the RCD circuit, and determine whether the power converter is operating based on the converter status signal. If it is confirmed that the power converter is not in operation, it is possible to determine whether the power line is grounded using the signal received from the IMD circuit.

Description

Electronic device and operating method for determining ground fault of power line using RCD circuit and IMD circuit {ELECTRONIC DEVICE FOR DETERMINING GROUND FAULT OF POWER LINE USING RCD CIRCUIT AND IMD CIRCUIT AND OPERATING METHOD THEREOF}

The present invention relates to an electronic device that determines a ground fault in a power line, and specifically relates to an electronic device that determines a ground fault in a power line using an RCD (residual current devices) circuit and an IMD (insulation monitoring device) circuit.

The detection accuracy of ground faults in ungrounded or high-resistance grounded power systems is generally not high. This is because the size of the fault current is very small and false detections often occur due to the internal structure of the system equipment. Generally, residual current devices (RCD) circuits and insulation monitoring devices (IMD) circuits are widely used in ungrounded or high-resistance grounded power systems.

Looking at FIG. 1 for explaining a general IMD circuit structure, the insulation monitoring device 10 corresponding to the IMD circuit includes a coupler resistance (Rc, 180) connected to the power lines (hereinafter power lines, 170) of the system, and a signal measurement circuit. A signal generation circuit 130 that applies a triangle wave signal to the power line 170 through (120) and the coupler resistor 180, is formed between the power line 170 and ground, and includes an insulation resistance (Re) and a capacitor ( It is connected to the impedance 160 consisting of Ce), the signal measurement circuit 120 including the detection resistance (Rm), and the signal measurement circuit 120, and controls other components and determines the voltage difference across the detection resistor and the detection resistance. It may include a control circuit 100 that calculates and monitors the impedance 160 value based on at least one of the currents flowing through the . The IMD circuit generally injects a signal into the power line and analyzes the signal returning within the loop to determine whether there is a ground fault.

Looking at FIG. 2 to explain a general RCD circuit structure, a neutral conductor 210 is installed on the power line, and the current balance between the two conductors is detected through the sensor 220 to determine whether there is a ground fault.

However, when using an IMD circuit, an erroneous determination of a ground fault may occur depending on the internal configuration of the equipment installed in the system, and when using an RCD circuit, an erroneous determination of a ground fault may occur if the stopping or operating current in the system is very small. There was a drawback.

The purpose of this application is to solve the above-mentioned problems, and aims to provide an electronic device that controls the operation of the IMD circuit and the RCD circuit using a control board and more effectively determines whether there is a ground fault by selectively using the signals received from the two circuits. .

In the electronic device for determining a ground fault of a power line connected to a DC/AC power converter that outputs a converter status signal indicating whether the converter is in operation to a control circuit according to various embodiments of the present application, the electronic device is connected to one end of the DC/AC power converter. an IMD circuit that outputs a signal indicating the insulation state of the power line to a control circuit; an RCD circuit connected to the other end of the DC/AC power converter and outputting a signal for determining whether a leakage current in the power line exists to a control circuit; and a control circuit connected to the DC/AC power converter, the IMD circuit, and the RCD circuit, wherein the control circuit: operates the power converter based on a converter status signal received from the DC/AC power converter. Based on the converter status signal, the power converter is checked to determine whether the power converter is operating, and if it is confirmed that the power converter is operating based on the converter status signal, whether the power line is grounded using a signal received from the RCD circuit. If it is confirmed that the power converter is not in operation, it is possible to determine whether the power line is grounded using the signal received from the IMD circuit.

The electronic device according to one embodiment further includes a user interface including a communication module, and the user interface can transmit the status signal to an external system.

The control circuit according to one embodiment may control a breaker connected to the power line to be opened when it is determined that a ground fault has occurred in the power line according to the determination of whether a ground fault has occurred.

The control circuit according to one embodiment stops the operation of the IMD circuit when it is confirmed that the power converter is in operation based on the converter status signal, and stops the operation of the IMD circuit when the power converter is not in operation based on the converter status signal. If confirmed, the operation of the RCD circuit can be stopped.

Figure 1 is a diagram for explaining a general IMD circuit structure.
Figure 2 is a diagram for explaining a general RCD circuit structure.
Figure 3 is a block diagram of an electronic device that determines a ground fault in a power line according to various embodiments of the present disclosure.
Figure 4 is a diagram to explain a filter existing in a DC/AC power converter.
Figure 5 is a circuit diagram for explaining the operation of an electronic device that determines a ground fault in a power line according to various embodiments of the present disclosure.
FIG. 6 is a flowchart illustrating a method of operating an electronic device that determines a ground fault in a power line according to various embodiments of the present disclosure.
The above drawings are provided as examples so that the idea of the present invention can be sufficiently conveyed to those skilled in the art.
Accordingly, the present invention is not limited to the drawings presented below and may be embodied in other forms.
Additionally, like reference numerals refer to like elements throughout the specification.
In addition, it should be noted that in the above drawings, to facilitate understanding, certain parts are enlarged or reduced not in proportion to the scale.

Various embodiments are now described with reference to the drawings. In this specification, various descriptions are presented to provide a better understanding of the disclosure. However, it is clear that these embodiments may be practiced without these specific descriptions.

As used herein, the terms “component,” “module,” “system,” and the like refer to a computer-related entity, hardware, firmware, software, a combination of software and hardware, or an implementation of software. For example, a component may be, but is not limited to, a process running on a processor, a processor, an object, a thread of execution, a program, and/or a computer. For example, both an application running on an electronic device and the electronic device can be a component. One or more components may reside within a processor and/or thread of execution. A component can be localized within one computer. A component may be distributed between two or more computers. Additionally, these components can execute from various computer-readable media having various data structures stored thereon. Components can communicate, for example, with one or more data packets (e.g., data and/or signals from one component interacting with other components in a local system, distributed system, other systems and networks such as the Internet). Depending on the data being transmitted, the communication may be carried out locally and/or remotely.

Additionally, the term “or” is intended to mean an inclusive “or” and not an exclusive “or.” That is, unless otherwise specified or clear from context, “X utilizes A or B” is intended to mean one of the natural implicit substitutions. That is, either X uses A; X uses B; Or, if X uses both A and B, “X uses A or B” can apply to either of these cases. Additionally, the term “and/or” as used herein should be understood to refer to and include all possible combinations of one or more of the related listed items.

Additionally, the terms “comprise” and/or “comprising” should be understood to mean that the corresponding feature and/or element is present. However, the terms “comprise” and/or “comprising” should be understood as not excluding the presence or addition of one or more other features, elements and/or groups thereof. Additionally, unless otherwise specified or the context is clear to indicate a singular form, the singular terms herein and in the claims should generally be construed to mean “one or more.”

And, the term “at least one of A or B” should be interpreted to mean “a case containing only A,” “a case containing only B,” and “a case of combining A and B.”

Those skilled in the art will additionally recognize that the various illustrative logical blocks, components, modules, circuits, means, logic, and algorithm steps described in connection with the embodiments disclosed herein may be implemented using electronic hardware, computer software, or a combination of both. It must be recognized that it can be implemented with To clearly illustrate the interchangeability of hardware and software, various illustrative components, blocks, configurations, means, logics, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented in hardware or software will depend on the specific application and design constraints imposed on the overall system. A skilled technician can implement the described functionality in a variety of ways for each specific application. However, such implementation decisions should not be construed as taking the scope beyond the scope of this disclosure.

The description of the presented embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art. The general principles defined herein may be applied to other embodiments without departing from the scope of the disclosure. Therefore, the present invention is not limited to the embodiments presented herein. The present invention is to be interpreted in the broadest scope consistent with the principles and novel features presented herein.

Network function, artificial neural network, and neural network may be used interchangeably herein.

Various embodiments described herein can be implemented, for example, in recording and storage media readable by a computer or similar device using software, hardware, or a combination thereof.

According to hardware implementation, the embodiments described herein include application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), and field programmable gate arrays (FPGAs). It may be implemented using at least one of processors, controllers, micro-controllers, microprocessors, and other electrical units for performing functions. In some cases, as described herein, The described embodiments may be implemented in the processor of the electronic device itself.

Figure 3 is a block diagram of an electronic device that determines a ground fault in a power line according to various embodiments of the present disclosure.

Referring to FIG. 3, the electronic device 300 for determining a ground fault of the power line 310 according to various embodiments of the present application includes a control board 301, a user interface 302, an IMD circuit 303, and an RCD circuit ( 304) may be included. A DC/AC power converter 310 may be disposed on the power line 310 to output a converter status signal indicating whether the DC/AC power converter 312 is operating to the control board 301.

Circuit breakers 311 and 313 disposed on the power line 310 may be opened or shorted according to a signal from the control board 301. The IMD circuit 303 is connected to one end of the DC/AC power converter 312 and can output a signal indicating the insulation state of the power line 310 to the control board 301. The RCD circuit 304 is connected to the other end of the DC/AC power converter 312 and can output a signal for determining whether leakage current of the power line 310 exists to the control board 301.

The control board 301 is connected to the DC/AC power converter 312, the user interface 302, the IMD circuit 303, the RCD circuit 304, and the circuit breaker 313, and controls the overall system configuration. The circuit can be referred to collectively.

Although the scope of the present application is not limited thereto, referring to FIG. 4, the DC/AC power converter 312 may generally be composed of a DC filter, a transistor, and an AC filter. The filter may include, for example, a filter including a capacitor connected to ground, as shown in FIG. 5 . A filter including a capacitor connected to ground as shown in FIG. 5 has excellent filter effect, but when the circuit breaker in FIGS. 3 and 4 is shorted, a current-carrying circuit may be formed between the ground and the power line 310. Referring to FIG. 4, if the circuit breaker is shorted and the capacitor in the filter forms a current-carrying circuit, the IMD circuit 303 may malfunction. Accordingly, taking into account the fact that the IMD circuit 303 may malfunction, a method for ensuring reliability in determining whether the power line 310 of the electronic device 300 has a ground fault in the overall system will be described in detail below. .

The control board 301 may check whether the power converter is operating based on a converter status signal indicating whether the power converter is operating received from the DC/AC power converter 312.

When it is confirmed by the control board 301 that the power converter 312 is in operation, it is possible to determine whether the power line is grounded using the signal received from the RCD circuit 304. Since the RCD circuit 303 has the ability to detect a ground fault when the circuit breakers 311 and 313 are shorted and the power converter 312 operates, the control board 301 has the RCD circuit 304 and the IMD circuit 303. It is possible to determine whether there is a ground fault based on the signal received from the RCD circuit 304 among the signals received from .

When it is confirmed by the control board 301 that the power converter 312 is not in operation, it is possible to determine whether the power line 310 is grounded using the signal received from the IMD circuit 303. Since the IMD circuit 303 has the ability to detect a ground fault when the circuit breakers 311 and 313 are open and the power converter 312 operates, the control board 301 has the RCD circuit 304 and the IMD circuit 303. It is possible to determine whether there is a ground fault based on the signal received from the IMD circuit 303 among the signals received from . Depending on the determination of whether a ground fault exists, the control board 302 may control the circuit breaker connected to the power line to be opened when it is determined that a ground fault has occurred in the power line.

The electronic device 300 according to various embodiments of the present application may further include a user interface 301 including a communication module, and the control board 302 may transmit the status signal to an external system through the user interface 301. It can be sent to .

According to one embodiment, when the control board 302 determines that the power converter 312 is operating based on the converter status signal, it stops the operation of the RCD circuit 304 and states the converter status signal. If it is confirmed that the power converter 312 is not in operation based on the signal, the operation of the IMD circuit 303 may be stopped. In this way, by stopping the operation of a configuration that has decided not to use the corresponding signal, it can have the effect of saving power.

FIG. 6 is a flowchart illustrating a method of operating an electronic device that determines a ground fault in a power line according to various embodiments of the present disclosure.

A method of determining a ground fault of a power line to which the DC/AC power converter 312 is connected according to various embodiments of the present application may be performed by the control board 302.

In step 610, the control board 302 may check whether the power converter 312 is operating based on the converter status signal received from the DC/AC power converter 312.

In step 620, the control board 302 determines that the power converter 3120 is operating based on the converter status signal, and in step 630, the control board 302 receives the signal from the RCD circuit. Using this, it is possible to determine whether the power line 310 has a ground fault.

In step 620, when it is confirmed that the power converter is not in operation based on the converter status signal, in step 640, the control board 302 determines whether the power line is grounded using the signal received from the IMD circuit. can do. Since the detailed information on the operating method of the electronic device that determines the ground fault is the same as described above, detailed description will be omitted.

Those skilled in the art will understand that information and signals can be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols and chips that may be referenced in the above description include voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields. It can be expressed by particles or particles, or any combination thereof.

Those of skill in the art will understand that the various illustrative logical blocks, modules, processors, means, circuits and algorithm steps described in connection with the embodiments disclosed herein may be used in electronic hardware, (for convenience) It will be understood that the implementation may be implemented by various forms of program or design code (referred to herein as software) or a combination of both. To clearly illustrate this interoperability of hardware and software, various illustrative components, blocks, modules, circuits and steps have been described generally above with respect to their functionality. Whether this functionality is implemented as hardware or software depends on the specific application and design constraints imposed on the overall system. A person skilled in the art may implement the described functionality in a variety of ways for each specific application, but such implementation decisions should not be construed as departing from the scope of the present application.

The various embodiments presented herein may be implemented as a method, apparatus, or article of manufacture using standard programming and/or engineering techniques. The term article of manufacture includes a computer program, carrier, or media accessible from any computer-readable storage device. For example, computer-readable storage media includes magnetic storage devices (e.g., hard disks, floppy disks, magnetic strips, etc.), optical disks (e.g., CDs, DVDs, etc.), smart cards, and Includes, but is not limited to, flash memory devices (e.g., EEPROM, cards, sticks, key drives, etc.). Additionally, various storage media presented herein include one or more devices and/or other machine-readable media for storing information.

It is to be understood that the specific order or hierarchy of steps in the processes presented is an example of illustrative approaches. It is to be understood that the specific order or hierarchy of steps in processes may be rearranged within the scope of the present disclosure, based on design priorities. The appended method claims present elements of the various steps in a sample order but are not meant to be limited to the particular order or hierarchy presented.

The description of the presented embodiments is provided to enable any person skilled in the art to use or practice the present disclosure. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be applied to other embodiments without departing from the scope of the disclosure. Accordingly, the disclosure is not limited to the embodiments presented herein, but is to be construed in the broadest scope consistent with the principles and novel features presented herein.

Claims (4)

In an electronic device that determines a ground fault in a power line to which a DC/AC power converter is connected,
an insulation monitoring devices (IMD) circuit connected to one end of the DC/AC power converter and outputting a signal indicating the insulation state of the power line to a control circuit;
an RCD (residual current devices) circuit connected to the other end of the DC/AC power converter and outputting a signal for determining the presence of leakage current in the power line to a control circuit;
It includes a control circuit connected to the DC/AC power converter, the IMD circuit, and the RCD circuit,
The control circuit is:
Based on the converter status signal received from the DC/AC power converter, determine whether the power converter is operating,
When it is confirmed that the power converter is operating based on the converter status signal, determine whether the power line is grounded using the signal received from the RCD circuit,
When it is confirmed that the power converter is not in operation based on the converter status signal, determining whether the power line is grounded using the signal received from the IMD circuit,
An electronic device that determines ground faults in power lines.
According to paragraph 1,
Further comprising a user interface including a communication module,
The user interface transmits the status signal to an external system,
An electronic device that determines ground faults in power lines.
According to paragraph 1,
The control circuit is,
Controlling the breaker connected to the power line to be opened when it is determined that a ground fault of the power line has occurred, according to the determination of whether or not there is a ground fault.
An electronic device that determines ground faults in power lines.
According to paragraph 1,
The control circuit is,
If it is determined that the power converter is operating based on the converter status signal, stopping the operation of the RCD circuit,
Stopping the operation of the IMD circuit when it is determined that the power converter is not in operation based on the converter status signal,
An electronic device that determines ground faults in power lines.

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