KR102590513B1 - The Apparatus Of Measuring Residual Voltage In Switchboard - Google Patents

Abstract

The present invention is a residual voltage measuring device in a switchboard. More specifically, the present invention is a device that can accurately measure the residual voltage inside the switchgear through a dual residual voltage measurement method, and includes a plurality of LEDs that are inserted into the door panel of the switchgear and emit light in multiple colors. This relates to a switchgear residual voltage measuring device that can prevent electric shock accidents that may occur when workers open the door of a switchboard with residual voltage remaining by intuitively informing workers of information about the residual voltage flowing inside the switchgear. .

Description

The Apparatus Of Measuring Residual Voltage In Switchboard}

The present invention is a residual voltage measuring device in a switchboard. More specifically, the present invention is a device that can accurately measure the residual voltage inside the switchgear through a dual residual voltage measurement method, and includes a plurality of LEDs that are inserted into the door panel of the switchgear and emit light in multiple colors. This relates to a switchgear residual voltage measuring device that can prevent electric shock accidents that may occur when workers open the door of a switchboard with residual voltage remaining by intuitively informing workers of information about the residual voltage flowing inside the switchgear. .

A switchgear is an electrical facility that receives high-voltage and extra-high voltage power from a substation and distributes the power to consumers such as apartments, hotels, and factories. It may be composed of a substation facility to step down the low-voltage commercial voltage, and a distribution facility to supply the step-down power to consumers. More specifically, the switchgear may include various blocking equipment and installation equipment such as switches, transformers, circuit breakers, condensers, power fuses, lightning arresters, current transformers, and power meters.

Meanwhile, electric shock accidents are the most fatal hazard in industrial sites. Looking at the status of casualties due to electric shock accidents from 2013 to 2017, the largest number of casualties occurred due to direct contact with charging parts, etc., and most of these accidents occurred during electrical construction. /Occurs during maintenance work. In other words, the risk of accidents due to residual voltage before work is still very high, and the introduction of technology to solve this problem is required.

Conventionally, in order to prevent accidents due to residual voltage, workers performed work by checking the voltage at each desired point using a portable tester. Additionally, when a worker opens the door of a switchboard, a high level of electrostatic charge may be generated due to friction caused by materials used in clothing, including shoes, boots, and gloves, which may result in an electrostatic accident, and may cause damage to electrical panels or equipment. If you are directly exposed to an electric circuit with the door open, an accident may occur due to arcing. To prevent such safety accidents, workers wore special safety clothing and performed work to measure residual voltage. Due to this inspection process, problems arose in that work time increased and work efficiency decreased.

As a conventional technology to prevent such electrical accidents, there is a technology for protecting against electric leakage and electric shock accidents in the power system, such as Republic of Korea Patent No. 10-2397748, and the conventional technology is used to prevent insulation deterioration of power facilities. However, as mentioned above, there is no suggestion regarding technology that can check the residual voltage present inside the switchgear even from outside the switchgear when performing electrical work related to the switchgear. Therefore, there is a need for technology that allows workers to intuitively determine the residual voltage without increasing work time or reducing work efficiency when performing electrical work related to the above-mentioned switchgear.

Republic of Korea Patent No. 10-2397748 (2022.05.10.)

The present invention is a residual voltage measuring device in a switchboard. More specifically, the present invention is a device that can accurately measure the residual voltage inside the switchgear through a dual residual voltage measurement method, and includes a plurality of LEDs that are inserted into the door panel of the switchgear and emit light in multiple colors. It provides a switchgear residual voltage measuring device that can prevent electric shock accidents that may occur when workers open the door of a switchboard with residual voltage remaining by intuitively informing workers of information about the residual voltage flowing inside the switchgear. The purpose is to

In order to solve the above problems, one embodiment of the present invention is a switchboard residual voltage measuring device, which has a shape that is inserted into the enclosure of the switchboard and provides information to the user about the residual voltage present inside the switchboard. It includes a cover surrounding an information display unit and a board portion electrically connected to a busbar having a three-phase, four-wire wiring structure provided inside the switchgear, wherein the information display unit includes a case portion exposed to be visible from the outside of the switchboard; and a substrate portion provided inside the case portion, wherein the substrate portion includes a connection portion dually connected to the bus bar including an R-phase power line, an S-phase power line, a T-phase power line, and a neutral wire; and a switching unit sequentially transmitting power input from each of the R-phase power line, S-phase power line, T-phase power line, and neutral line to the voltage measuring unit; and a voltage measurement unit that measures the input voltage based on the power transmitted through the switching unit and independently measures the voltage for each power input through the dually connected connection unit. a control unit that derives information about the residual voltage based on the measured residual voltage; A communication unit that performs communication with an external terminal; and an LED unit including a plurality of LEDs that display information about the residual voltage generated based on the measured voltage in different colors according to a preset standard; a second substrate unit comprising a. The substrate portion and the second substrate portion are physically separate substrates, and are electrically connected through a plurality of connection lines, providing a device for measuring residual voltage in a switchgear.

In one embodiment of the present invention, the information display unit includes an LED display unit that displays a status according to the presence or absence of residual voltage inside the switchgear; A safety test button that performs a safety test on the switchboard; and an auxiliary power port connected to an external auxiliary power source to supply power to the residual voltage measuring device.

In one embodiment of the present invention, the plurality of LED elements included in the LED unit and installed in the central portion of the front surface of the second substrate unit emit first light generated when the control unit determines that there is no residual voltage inside the switchgear. It receives a signal and emits light in a first color, receives a second light emission control signal generated by the control unit when it determines that there is residual voltage inside the switchboard, and emits light in a second color different from the first color, and emits light in a second color different from the first color. The first and second colors emitted from a plurality of installed LED elements may be exposed to the user through the LED display unit.

In one embodiment of the present invention, the first substrate further includes a power supply unit that continuously supplies power to the residual voltage measuring device, and the power supply unit generates driving power of the residual voltage measuring device from a power line of a connected switchgear. A constant power input unit that receives input; SMPS unit that converts AC power supplied through the constant power input unit into DC power; and a power supply unit that supplies direct current power received from the SMPS unit as power supply to the residual voltage measuring device.

In one embodiment of the present invention, the connection unit includes: a first connection unit connected to a first location of the bus bar; a first step-down unit connected to the first connection unit and lowering the voltage input through the first connection unit; a second connection portion connected to a second location of the busbar; and a second step-down unit connected to the second connection unit and lowering the voltage input through the second connection unit, wherein each of the first connection unit and the second connection unit includes the R-phase power line, the S-phase power line, and the T It can be connected individually to each phase power line and neutral line.

In one embodiment of the present invention, the voltage measurement unit includes a first voltage measurement unit and a second voltage measurement unit, and the switching unit is configured to determine the voltage input at the first position of the R-phase power line and the voltage input from the S-phase power line. A first switching unit that sequentially transmits the voltage input at the first position, the voltage input at the first position of the T-phase power line, and the voltage input at the neutral line to the first voltage measurement unit according to a preset rule; and a voltage input at the second position of the R-phase power line, a voltage input at the second position of the S-phase power line, a voltage input at the second position of the T-phase power line, and a voltage input from the neutral line. A second switching unit sequentially transmits the voltage to the second voltage measuring unit according to a preset rule, wherein each of the first voltage measuring unit and the second voltage measuring unit measures the received voltage, and the measured voltage. Information about can be transmitted to the control unit.

In one embodiment of the present invention, the control unit performs a first voltage judgment step when the residual voltage measuring device is operating with a constant power supply, and the first voltage judgment step includes the voltage measured at the first position and A measured voltage comparison step of comparing the magnitude of the voltage measured at the second location; A first judgment step of determining whether the larger measured voltage is less than or equal to a preset first reference voltage; and a second determination step of determining whether the smaller measured voltage is greater than or equal to a preset second reference voltage. The color displayed on the LED unit may be determined based on the result of the first voltage determination step.

In one embodiment of the present invention, the control unit performs a second voltage judgment step when the residual voltage measuring device is operating as an auxiliary power source, and the second voltage judgment step determines the voltage measured at the first location and A measured voltage comparison step of comparing the magnitude of the voltage measured at the second location; A third judgment step of determining whether the voltage measured to be larger is greater than a preset third reference voltage may be included, and the color displayed on the LED unit may be determined based on the result of the second voltage judgment step.

According to one embodiment of the present invention, a worker can check the residual voltage status from outside even without opening the door of the switchboard, which has the effect of shortening work time.

According to one embodiment of the present invention, a worker can check the residual voltage status from outside even without opening the door of the switchboard, which has the effect of preventing various safety accidents that may occur when the door is opened.

According to one embodiment of the present invention, by measuring the residual voltage in duplicate, it is possible to measure more accurately than by measuring the residual voltage singly, which has the effect of preventing safety accidents due to residual voltage.

According to one embodiment of the present invention, by measuring the voltage from two independent voltage measuring units for the doubly measured residual voltage, even if one voltage measuring unit fails, the residual voltage can be measured from the remaining voltage measuring unit. This can be effective in preventing safety accidents caused by residual voltage.

According to one embodiment of the present invention, necessary information can be intuitively provided only with a predetermined LED element without a separate display device, and the structure can be simplified to enable simple insertion into the door panel of the switchgear, resulting in easy installation. there is.

According to one embodiment of the present invention, by using a substrate and device of a size and quantity optimized for performing the function of measuring residual voltage, it is possible to minimize production costs and facilitate installation.

Figure 1 schematically shows a switchboard in which the switchboard residual voltage measuring device of the present invention according to an embodiment of the present invention is installed.
Figure 2 schematically shows the external appearance of a switchgear residual voltage measuring device according to an embodiment of the present invention.
Figure 3 schematically shows the internal configuration of a distribution board residual voltage measuring device according to an embodiment of the present invention.
Figure 4 schematically shows the configuration of a busbar, a dually connected connection unit, and a switching unit according to an embodiment of the present invention.
Figure 5 schematically shows the process of measuring the residual voltage inside the switchgear according to an embodiment of the present invention.
Figure 6 schematically shows a connection unit, a constant power input unit, and a communication line connection unit according to an embodiment of the present invention.
Figure 7 schematically shows the internal configuration of a power supply unit according to an embodiment of the present invention.
Figure 8 schematically shows residual voltage information according to LED color displayed on the LED display unit according to an embodiment of the present invention.
Figure 9 schematically shows an information display unit according to an embodiment of the present invention.
Figure 10 schematically shows the steps of performing the first voltage determination step according to an embodiment of the present invention.
Figure 11 schematically shows the execution steps of the second voltage determination step according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS Various embodiments and/or aspects are now disclosed with reference to the drawings. In the following description, for purposes of explanation, numerous specific details are set forth to facilitate a general understanding of one or more aspects. However, it will also be appreciated by those skilled in the art that this aspect(s) may be practiced without these specific details. The following description and accompanying drawings set forth in detail certain example aspects of one or more aspects. However, these aspects are illustrative and some of the various methods in the principles of the various aspects may be utilized, and the written description is intended to encompass all such aspects and their equivalents.

Additionally, terms including ordinal numbers, such as first, second, etc., may be used to describe various components, but the components are not limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. For example, a first component may be named a second component, and similarly, the second component may also be named a first component without departing from the scope of the present invention. The term and/or includes any of a plurality of related stated items or a combination of a plurality of related stated items.

In addition, in the embodiments of the present invention, unless otherwise defined, all terms used herein, including technical or scientific terms, are generally understood by those skilled in the art to which the present invention pertains. It has the same meaning as Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and unless clearly defined in the embodiments of the present invention, have an ideal or excessively formal meaning. It is not interpreted as

Figure 1 schematically shows a switchboard in which the switchboard residual voltage measuring device 10000 of the present invention according to an embodiment of the present invention is installed.

As shown in FIG. 1, the switchboard residual voltage measuring device 10000 of the present invention is inserted into the door panel of the switchboard and is capable of intuitively providing the operator with the residual voltage status of the switchboard. Meanwhile, the residual voltage measuring device 10000 is preferably inserted into the door panel as shown in FIG. 1, but it can be inserted after drilling a hole in the panel that constitutes the enclosure of the switchgear, but not in the door.

Referring to the content described in [Background Technology of the Invention] of this specification, in the past, in order to measure the residual voltage inside the switchgear, the operator opened the door of the switchboard and then directly applied a tester to the wires or electrical facilities inside. I had to make contact. However, if a worker opens the door of a switchboard with residual voltage remaining, he or she may be easily exposed to safety accidents such as electric shock. To solve this problem, the inventor of the present invention designed the switchgear residual voltage measuring device (10000) of the present invention. did. Below, the technical features of the residual voltage measuring device 10000 will be described in detail.

Figure 2 schematically shows the external appearance of a switchgear residual voltage measuring device 10000 according to an embodiment of the present invention.

As shown in FIG. 2, the device 10000 for measuring residual voltage in a switchboard includes an information display unit 2100 that has a shape inserted into the enclosure of the switchboard and provides information to the user about the residual voltage present inside the switchboard; It includes a cover surrounding a substrate portion electrically connected to a busbar having a three-phase, four-wire wiring structure provided inside the switchgear, wherein the information display unit 2100 includes a case portion exposed to be visible from the outside of the switchgear. .

Schematically, Figure 2 (a) shows the front of the residual voltage measuring device 10000, and Figure 2 (b) shows the rear of the residual voltage measuring device 10000. That is, in this specification, the direction in which the information display unit 2100 shown in (a) of FIG. 2 is exposed is defined as the front of the residual voltage measuring device 10000, and therefore, the direction in which the information display unit 2100 shown in (a) of FIG. 2 is exposed is defined as the front of the residual voltage measuring device 10000. This part corresponds to the rear of the current and voltage measuring device.

Specifically, Figure 2 (a) shows the information display unit 2100 of the residual voltage measuring device 10000, and with reference to Figure 1, the information display unit 2100 is displayed on the switchboard in a form visible from the outside of the switchboard. can be inserted. The information display unit 2100 displays the residual voltage status inside the switchboard through LEDs, etc., or provides a button to operate the residual voltage measuring device 10000. A detailed description of the information display unit 2100 will be described later.

Figure 2(b) shows the cover of the residual voltage measuring device 10000, and the cover has a shape that surrounds the internal substrate portion. The configuration shown in (b) of FIG. 2 is installed in a form that is inserted into the switchgear, referring to FIG. 1. As shown in (b) of FIG. 2, the rear of the residual voltage measuring device 10000 is provided with a configuration in which a plurality of wires and communication lines can be electrically connected, and the configuration is directly connected to the substrate portion. Through this configuration, the substrate unit can receive driving power from the residual voltage measuring device 10000 or be electrically connected to a bus bar, and can communicate with an external terminal. The external terminal may be a control PC that manages the switchboard, and a worker or manager can monitor the information measured by the residual voltage measuring device 10000 through the control PC.

The residual voltage measuring device 10000 is preferably capable of measuring the residual voltage of a connected switchgear, but according to an embodiment of the present invention, the residual voltage measuring device 10000 measures the power, voltage, current, and power factor of the connected switchboard. Data such as measured power, voltage, current, and power factor are transmitted to the control PC, and the control PC can monitor the status of the corresponding switchboard based on the received data. Meanwhile, according to another embodiment of the present invention, the residual voltage measuring device 10000 can measure the phase voltage, line-to-line voltage, active power, reactive power, frequency, active power amount, reactive power amount and phase of the connected switchgear. . In this way, overvoltage, low voltage, power outage, changes in energization status, etc. of the switchboard can be monitored remotely in real time, which has the effect of lowering the probability of safety accidents by eliminating the need for workers to directly contact the switchboard.

Figure 3 schematically shows the internal configuration of a switchgear residual voltage measuring device 10000 according to an embodiment of the present invention.

As shown in FIG. 3, the device 10000 for measuring residual voltage in a switchgear includes an information display unit 2100 that has a shape inserted into the enclosure of the switchboard and provides information to the user about the residual voltage present inside the switchboard; It includes a cover surrounding a substrate portion electrically connected to a busbar having a three-phase, four-wire wiring structure provided inside the switchgear, wherein the information display unit 2100 includes a case portion exposed to be visible from the outside of the switchgear; and a substrate portion provided inside the case portion, wherein the substrate portion includes a connection portion 1100 dually connected to the bus bar including an R-phase power line, an S-phase power line, a T-phase power line, and a neutral line; and a switching unit 1200 that sequentially transfers power input from each of the R-phase power line, S-phase power line, T-phase power line, and neutral line to the voltage measurement unit 2400; a first substrate unit 1000 including a; And a voltage measurement unit ( 2400); A control unit 2200 that derives information about the residual voltage based on the measured residual voltage; A communication unit 2300 that performs communication with an external terminal; and an LED unit 2600 including a plurality of LEDs that display information about the residual voltage generated based on the measured voltage in different colors according to a preset standard. A second substrate unit 2000 including a. The first substrate 1000 and the second substrate 2000 are physically separate substrates and are electrically connected through a plurality of connection lines.

Specifically, as shown in FIG. 3, the switchgear residual voltage measuring device 10000 of the present invention is electrically connected to a busbar with a three-phase four-wire wiring structure, but is double-connected, and at the same location is an R-phase power line, Its technical feature is that it is connected to all of the S-phase power line, T-phase power line, and neutral line, measures each voltage, and then notifies the user if any residual voltage is detected above a preset standard.

The first position and the second position in FIG. 3 are shown to explain the dual connection configuration, and the first position and the second position may correspond to physically different positions as shown in FIG. 3. However, according to an embodiment of the present invention, it may correspond to the same location. Through the above-described configuration, the residual voltage can be measured more accurately compared to the conventional technology for measuring the residual voltage of a single point or single power line, which has the effect of preventing safety accidents.

In addition, the residual voltage measuring device 10000 is provided with a first substrate portion 1000 and a second substrate portion 2000. The first substrate portion 1000 and the second substrate portion 2000 correspond to physically separate and separate substrates, and the first substrate portion 1000 and the second substrate portion 2000 are the first substrate portion. The connection portion 1400 and the second substrate connection portion 2500 are electrically connected through a plurality of connection lines.

In the case of the residual voltage measuring device 10000 of the present invention, since it is inserted into a hole drilled in the enclosure of a switchboard, the smaller the size, the more advantageous. That is, if all the components of the present invention are provided on one substrate, the size of the substrate becomes too large, reducing the effectiveness of the device, and if all components are provided on a small substrate, measurement accuracy and electrical stability deteriorate. Accordingly, the inventor of the present invention secured stability and performance while reducing the size by placing two substrates in the cover of the residual voltage measuring device 10000. In addition, each of the two boards is a double-sided PCB, and the devices provided on the board are efficiently arranged to ensure both space efficiency and electrical stability.

As shown in FIG. 3, the connection part 1100 of the first substrate 1000 is electrically connected to the bus bar and can measure the residual voltage flowing in the bus bar. More specifically, the connection part 1100 includes a first connection part 1111 (see FIG. 4) and a second connection part 1121 (see FIG. 4), and the first connection part 1111 is located at the first position of the bus bar. When connected, the second connection unit 1121 is connected to the second location of the bus bar and receives power from each location. A more detailed description of the connection unit 1100 will be provided later in the description of FIG. 4 .

The power input through the connection unit 1100 is transmitted to the voltage measurement unit 2400 of the second substrate unit 2000 through the switching unit 1200, and the voltage measurement unit 2400 measures the voltage of the received power. Afterwards, information about the residual voltage is transmitted to the control unit 2200 of the second substrate unit 2000. At this time, the voltage measuring unit 2400 includes a first voltage measuring unit 2410 (see FIG. 5) and a second voltage measuring unit 2420 (see FIG. 5), and the first voltage measuring unit 2410 The magnitude of the residual voltage input through the first connection unit 1111 is measured, and the second voltage measurement unit 2420 measures the magnitude of the residual voltage input through the second connection portion 1121.

The power supply unit 1300 of the first substrate unit 1000 receives predetermined power from the power line of the connected switchboard and distributes it as driving power to each element provided in the residual voltage measuring device 10000. Additional description of the power supply unit 1300 will be provided later with reference to FIG. 7 . Information or power generated or transmitted from the connection unit 1100, the switching unit 1200, and the power unit 1300 are transmitted through the first substrate connection unit 1400 of the first substrate unit 1000 and the second substrate. It may be transmitted to the second substrate unit 2000 through the second substrate connection unit 2500 of the unit 2000. As described above, the first substrate connection portion 1400 and the second substrate connection portion 2500 are electrically connected through a plurality of connection lines.

Referring to the description of FIG. 2, the communication unit 2300 of the second substrate unit 2000 performs communication with an external terminal. As an embodiment of the present invention, the communication unit 2300 may perform data communication with an external terminal through a serial communication method such as RS-485, and as another embodiment of the present invention, the communication unit 2300 may perform data communication using MODBUS. Data communication with an external terminal can be performed using a LAN communication method such as TCP. The above-described embodiment and the other embodiments are compatible with each other, and a manager or worker can monitor the three-phase voltage and status of a remotely connected switchboard without directly measuring the residual voltage of the switchboard in the field. It can provide real-time monitoring of overvoltage, undervoltage, power outage, and energization status change data from the switchboard.

The control unit 2200 of the second substrate unit 2000 controls the operation of the residual voltage measuring device 10000, which includes the above-described configuration, and controls the residual voltage based on the residual voltage measured by the voltage measuring unit 2400. Derive information about voltage. The control unit 2200 transmits a light emission command to the LED unit 2600 (see FIG. 8) provided in the second substrate unit 2000 based on the derived information, and the light emitted from the LED unit 2600 is provided to the user through the information display unit 2100 of the second substrate unit 2000. The LED unit 2600 can emit light in multiple colors, and the user can intuitively determine whether residual voltage exists inside the switchgear by looking at the color of the emitted light. The information display unit 2100 further includes a safety test button 2120 and an auxiliary power port 2130 that allow the residual voltage measuring device 10000 to perform a safety test, and a more detailed description thereof is shown in Figure 2. This will be explained later in the explanation of 9.

Figure 4 schematically shows the configuration of the connection unit 1100 and the switching unit 1200 dually connected to the bus bar according to an embodiment of the present invention, and Figure 5 shows the remaining structure inside the switchgear according to an embodiment of the present invention. The process by which voltage is measured is schematically shown.

As shown in FIG. 4, the connection part 1100 includes a first connection part 1111 connected to a first position of the bus bar; A first step-down unit 1112 connected to the first connection unit 1111 and lowering the voltage input through the first connection unit 1111; a second connection unit 1121 connected to a second location of the busbar; and a second step-down unit 1122 that is connected to the second connection unit 1121 and lowers the voltage input through the second connection unit 1121, and includes the first connection unit 1111 and the second connection unit. (1121) Each is individually connected to the R-phase power line, S-phase power line, T-phase power line, and neutral line.

As shown in FIG. 5, the voltage measuring unit 2400 includes a first voltage measuring unit 2410 and a second voltage measuring unit 2420, and the switching unit 1200 is configured to measure the voltage of the R-phase power line. The voltage input at the first position, the voltage input at the first position of the S-phase power line, the voltage input at the first position of the T-phase power line, and the voltage input from the neutral line according to preset rules. A first switching unit 1210 that sequentially transmits data to the first voltage measuring unit 2410; and a voltage input at the second position of the R-phase power line, a voltage input at the second position of the S-phase power line, a voltage input at the second position of the T-phase power line, and a voltage input from the neutral line. A second switching unit (1220) sequentially transmits to the second voltage measuring unit (2420) according to a preset rule, wherein the first voltage measuring unit (2410) and the second voltage measuring unit (2420) ) Each measures the received voltage and transmits information about the measured voltage to the control unit 2200.

Specifically, as described above, the first connection unit 1111 is connected to each of the R-phase power line, S-phase power line, T-phase power line, and neutral line at the first position, and then the power from each is transferred to the first step-down unit ( 1112). The first step-down unit 1112 lowers the power or voltage input through the first connection unit 1111 to a power or voltage below a preset standard. In addition, the second connection unit 1121 connects each of the R-phase power line, S-phase power line, T-phase power line, and neutral line at the second location, and then transmits power from each to the second step-down unit 1122. The first step-down unit 1112 and the second step-down unit 1122 lower the power or voltage input through the second connection unit 1121 to a power or voltage below a preset standard, and the first substrate unit It serves to protect the circuits of (1000) and the second substrate unit (2000).

As shown in FIG. 4, in each of the first step-down section 1112 and the second step-down section 1122 (hereinafter referred to as step down section), the power from each of the R-phase power line, S-phase power line, T-phase power line, and neutral line is It is independently transmitted to the first switching unit 1210 and the second switching unit 1220 (hereinafter commonly referred to as the switching unit 1200), and each of the first switching unit 1210 and the second switching unit 1220 is transmitted. Outputs one power out of the four powers received. The operation process of the switching unit 1200 is shown in FIG. 5.

As shown in FIG. 5, the four powers output from the step-down unit are sequentially output one by one according to preset rules in the switching unit 1200 and are transmitted to the corresponding voltage measurement unit 2400. In other words, the four switching elements included in each of the switching units 1200 shown in FIG. 5 are closed one by one according to preset rules, so that the power input from each of the R-phase power line, S-phase power line, T-phase power line, and neutral line Only one power is transmitted to the voltage measurement unit 2400. Meanwhile, the switching element shown in FIG. 5 is a configuration for explanation and may correspond to an actual physical element according to one embodiment of the present invention, but may correspond to a logical element according to another embodiment of the present invention. .

As an embodiment of the present invention, the switching unit 1200 may operate according to preset rules encoded in an element that performs the switching operation, and as another embodiment of the present invention, the switching unit 1200 may be programmed in the control unit 2200. It can operate according to preset or encoded rules. It is preferable that the first switching unit 1210 and the second switching unit 1220 operate independently of each other. The voltage measuring unit 2400, which receives the power transmitted through the first substrate connection unit 1400 and the second substrate connection unit 2500, measures the voltage at each of the R-phase power line, S-phase power line, T-phase power line, and neutral line. It measures, generates residual voltage information based on the measured voltage, and transmits it to the control unit 2200. That is, the residual voltage information includes all information about the residual voltage in the R-phase power line, the residual voltage in the S-phase power line, the residual voltage in the T-phase power line, and the residual voltage in the neutral line.

As described above, the technical feature of the present invention is to independently measure the voltage at the first and second positions. More specifically, the first voltage measurement unit 2410 and the second voltage measurement unit 2420 each include one or more processors, and each processor individually measures the voltage at the first location and the second location. is measured, and the residual voltage information for each is transmitted to the control unit 2200.

Through this configuration, even if one of the two voltage measurement lines (connection unit 1100 - step-down units 1112 and 1122 - voltage measurement unit 2400) breaks down in an emergency, the corresponding distribution board is connected through the other voltage measurement line. The internal residual voltage can be measured, making maintenance easy and preventing a decrease in work efficiency due to breakdown.

In addition, as an embodiment of the present invention, when the first location and the second location correspond to different locations and a plurality of electronic equipment or electrical devices exist between the first location and the second location, the plurality of electronic devices It is possible to measure the residual voltage remaining inside equipment or electrical devices, which allows the residual voltage to be measured more accurately compared to the method of measuring the residual voltage at a single fixed point, and has the effect of ensuring the safety of workers. It can be performed.

Figure 6 schematically shows a connection unit 1100, a constant power input unit 1310, and a communication line connection unit 1500 according to an embodiment of the present invention.

Referring to Figure 2 (b), schematically, Figure 6 (a) shows the rear of the residual voltage measuring device 10000, and Figure 6 (b) shows the residual voltage measuring device 10000. The right side is shown.

Specifically, the rear of the residual voltage measuring device 10000 is provided with a configuration in which a plurality of wires and communication lines can be electrically connected. More specifically, the first connection unit 1111 provided on the left rear of the residual voltage measuring device 10000 is electrically connected to each of the R-phase power line, S-phase power line, T-phase power line, and neutral line at the first position of the bus bar. It is connected to the second connection part 1121 provided on the left rear of the residual voltage measuring device 10000, and the second connection part 1121 is electrically connected to each of the R-phase power line, S-phase power line, T-phase power line, and neutral line at the second position of the bus bar. It is connected to . As shown in (a) of FIG. 6, each of the four contact points included in each of the first connection part 1111 and the second connection part 1121 can be fixed to the wire using a bolt, and the four contact points Each is connected to the R-phase power line, S-phase power line, T-phase power line, and neutral line of the busbar, respectively. In Figure 6 (a), as an embodiment of the present invention, the second connection part 1121 is shown as being provided at the bottom of the first connection part 1111. However, according to another embodiment of the present invention, the second connection part 1121 is provided at the bottom of the first connection part 1111. The first connection part 1111 may be provided at the bottom of the second connection part 1121.

As shown in (a) of FIG. 6, a constant power input unit 1310 and a communication line connection unit 1500 are provided on the right rear side of the residual voltage measuring device 10000. The constant power input unit 1310 includes, but is not limited to, three contact points provided at the top among a plurality of contact points provided on the right rear side of the residual voltage measuring device 10000. Three wires fixed with bolts included in the three contact points provided at the top are connected to the power line of the corresponding switchboard and constantly supply power to the residual voltage measuring device (10000).

The communication line connection unit 1500 includes, but is not limited to, three contact points provided at the bottom among a plurality of contact points provided on the right rear side of the residual voltage measuring device 10000. The three communication lines fixed with bolts included in the three contact points provided at the bottom are directly or indirectly connected to an external terminal such as a control PC to transmit or receive data measured by the residual voltage measuring device (10000). You can.

The contact point provided between the constant power input unit 1310 and the communication line connection unit 1500 is an embodiment of the present invention, and is used to measure current, voltage, or other information (e.g., power factor, frequency, phase, etc.) Electrical wires, etc. may be connected.

As shown in FIG. 6(b), the substrate portion of the present invention is surrounded by a cover, and the right side of FIG. 6(b) is the front of the residual voltage measuring device 10000, where the information display portion 2100 is located. It is the exposed direction, and the left side of Figure 6 (b) corresponds to the rear of the residual voltage measuring device 10000.

Figure 7 schematically shows the internal configuration of the power supply unit 1300 according to an embodiment of the present invention.

As shown in FIG. 7, the first substrate unit 1000 further includes a power supply unit 1300 that continuously supplies power to the residual voltage measuring device 10000, and the power supply unit 1300 is connected to A constant power input unit 1310 that receives driving power of the residual voltage measuring device 10000 from the power line of the switchgear; SMPS unit 1320 that converts AC power supplied through the constant power input unit 1310 into DC power; and a power supply unit 1330 that supplies direct current power received from the SMPS unit 1320 as power supply to the residual voltage measuring device 10000.

Specifically, with reference to (a) of FIG. 6, the constant power input unit 1310 performs the role of receiving predetermined power from the power line of the connected switchboard, and when power is supplied to the switchboard, the constant power input unit 1310 1310 can always receive power through the power line. Power input through the constant power input unit 1310 is transmitted to the SMPS unit 1320.

The SMPS unit 1320 includes a Switched Mode Power Supply (SMPS) including one or more A/D conversion modules. That is, the SMPS unit 1320 converts the AC power input through the constant power input unit 1310 into DC power and smoothes it, thereby stably supplying the DC power required to drive the residual voltage measuring device 10000. so that it can be accomplished. As an embodiment of the present invention, the SMPS unit 1320 may further include a power factor correction circuit, etc. The DC power converted in this way is transmitted to the entire residual voltage measuring device 10000 through the power supply unit 1330 and used as driving power of the residual voltage measuring device 10000.

Figure 8 schematically shows residual voltage information according to LED color displayed on the LED display unit according to an embodiment of the present invention, and Figure 9 schematically shows the information display unit 2100 according to an embodiment of the present invention. .

As shown in Figures 8 and 9, the switchgear residual voltage measuring device 10000 includes an information display unit 2100 that provides the user with information about the residual voltage present inside the switchgear; and based on the measured voltage and an LED unit 2600 including a plurality of LEDs that display information about the generated residual voltage in different colors according to a preset standard.

In addition, the information display unit 2100 includes LED display units 2111 to 2112 that display the status according to the presence or absence of residual voltage inside the switchgear; A safety test button (2120) that performs a safety test on the switchgear; and an auxiliary power port 2130 that is connected to an external auxiliary power source to supply power to the residual voltage measuring device 10000, and is included in the LED unit 2600, and the second substrate unit 2000 A plurality of LED elements installed in the central portion of the front of the control unit 2200 emit light in a first color by receiving a first light emission signal generated by determining that there is no residual voltage inside the switchgear, and the control unit 2200 receives a second light emission control signal generated by determining that there is residual voltage inside the switchgear and emits light in a second color different from the first color, and a first color emitted from a plurality of LED elements installed in the central portion, and The second color is exposed to the user through the LED display units 2111 to 2112.

Schematically, Figure 8 (a) shows the process by which the control unit 2200 transmits a light emitting signal to the LED unit 2600, and Figure 8 (b) shows the color displayed on the LED display units 2111 to 2112. It shows the residual voltage status of the switchboard. FIG. 9 shows the information display unit 2100 shown in FIG. 2(a) in more detail.

Specifically, as shown in FIG. 8, the control unit 2200 determines whether a residual voltage exists inside the switchgear based on the residual voltage information received from the voltage measurement unit 2400. According to one embodiment of the present invention, only when the residual voltage is 0, it can be determined that there is no residual voltage inside the switchboard. According to another embodiment of the present invention, when the residual voltage information is less than a preset standard, it can be determined that there is no residual voltage inside the switchgear. It can be determined that there is no residual voltage. When the control unit 2200 determines that there is no residual voltage inside the switchboard, the control unit 2200 generates and transmits a first light emission signal to the LED unit 2600 to emit light in the first color. The LED unit 2600 that receives this emits light in the first color, and the first color may correspond to green in a preferred embodiment.

Meanwhile, the control unit 2200 detects any remaining voltage among the R-phase power line, S-phase power line, T-phase power line, and neutral line of the busbar at each of the first and second positions received from the voltage measurement unit 2400. If the voltage is higher than the preset standard, it is determined that residual voltage exists inside the switchgear.

For example, the voltages in each of the R-phase power line, S-phase power line, T-phase power line, and neutral line at the first location are all less than a preset standard, and the voltages at each of the R-phase power line, S-phase power line, and neutral line at the second location are If the voltages at all are less than the preset standard, but the voltage measured on the T-phase power line at the second location is more than the preset standard, the control unit 2200 determines that there is residual voltage inside the corresponding switchgear, A second light emission signal is generated and transmitted to the LED unit 2600 to emit light in a second color. The LED unit 2600 that receives the second light emission signal emits light in the second color, and the second color may correspond to red in a preferred embodiment.

The first color and the second color are not limited to the above-mentioned example, but must be set to different colors, and should be set so that a user located outside the switchboard can intuitively determine the residual voltage status inside the switchboard.

As shown in FIG. 9, the information display unit 2100 includes an LED display unit (2111 to 2112), an auxiliary power port 2130, and a safety test button 2120, and the LED display units (2111 to 2112) are It includes a 1 LED display unit 2111 and a 2 LED display unit 2112. As described above, the control unit 2200 generates a light-emitting signal based on the information received from the first voltage measurement unit 2410 and the second voltage measurement unit 2420, and transmits the light-emitting signal to the LED unit 2600. Send. The LED unit 2600 includes a plurality of LED elements installed on the front surface of the second substrate unit 2000.

Preferably, the LED unit 2600 includes a first LED unit (not shown) and a second LED unit (not shown), and the light emitted from the first LED unit is transmitted to the user through the first LED display unit 2111. The light emitted from the second LED unit is exposed to the user through the second LED display unit 2112. The first LED unit is installed on the front upper part of the second substrate unit 2000, and may include a first LED element, a second LED element, and a third LED element, referring to FIG. 9. It is preferable that each of the first LED element, the second LED element, and the third LED element are spaced apart from each other at the same distance.

The first LED display unit 2111 includes three holes drilled at positions corresponding to the positions where the first LED element, the second LED element, and the third LED element are installed in the second substrate unit 2000, and the three holes Through this, light emitted from the first LED element, the second LED element, and the third LED element may be exposed to the user. At the bottom of each of the three holes, words meaning 'danger', 'safety', and 'diagnosis' may be written. More specifically, through the light emitted from each LED element included in the first LED unit, the user can check whether the switchgear is safe (no residual voltage), dangerous (whether residual voltage exists), or whether the switchgear is outside the switchboard. Alternatively, it can be determined whether diagnosis of the residual voltage measuring device 10000 is required.

Referring to FIG. 9, the second LED unit is spaced apart from the first LED unit and is installed in the shape of a lightning bolt at the front center of the second substrate unit 2000, and includes a plurality of LED elements that emit light in two or more colors as described above. Includes. The second LED display unit 2112 includes a lightning-shaped logo provided at a position corresponding to the position of the second LED unit installed in the shape of a lightning bolt, and the border of the lightning-shaped logo can be exposed in the color that the second LED unit emits. It is preferable that it is made of a light-transmitting material.

The second LED unit may include a plurality of LED elements, preferably 2 to 6 LED elements, and more preferably 4 to 5 LED elements. Through the color of light emitted from each LED element included in the second LED unit, the user can determine whether the switchgear is safe (e.g., when emitting light in the first color) or dangerous (e.g., when emitting light in the first color) even outside the switchgear. For example, if light is emitted in the second color), it can be detected.

The information display unit 2100 includes a safety test button 2120 that performs a safety test on the switchboard. When the user presses the safety test button 2120, the switch installed on the second substrate unit 2000 receives the user's press input and transmits it to the control unit 2200, and the control unit 2200 receives the press input. Correspondingly, the residual voltage measuring device 10000 is made to perform a safety test on the switchboard. The safety test is a process of re-measuring the residual voltage of the switchboard. After pressing the safety test button (2120), the user opens the door of the switchboard by looking at the information provided through the LED display units (2111 to 2112). Can perform electrical work.

Additionally, the information display unit 2100 includes an auxiliary power port 2130. The auxiliary power port 2130 is a configuration that can receive auxiliary power, and may preferably correspond to a USB port. As described above, the residual voltage measuring device 10000 receives driving power from the power line of the connected switchgear. However, in the case of most electrical work, it is preferable to perform it under a power outage. When a power outage occurs, the driving power of the residual voltage measuring device (10000) is not supplied, making it impossible to measure the residual voltage inside the switchgear or the measured residual voltage. Information cannot be provided to users.

The purpose of the present invention is to prevent electric shock accidents when workers perform electrical work due to the presence of residual voltage inside the switchgear even though the power is out. In order to solve this problem, the residual voltage measuring device 10000 is installed such as an auxiliary battery. By connecting auxiliary power to the auxiliary power port 2130, only the residual voltage measuring device 10000 can be operated while the switchgear is in a power outage.

Through the information display unit 2100 including the above-described configuration, it is possible to intuitively provide the user with the residual voltage status of the corresponding switchgear without a separate display configuration.

Figure 10 schematically shows the steps of performing the first voltage determination step according to an embodiment of the present invention.

As shown in FIG. 10, the control unit 2200 performs a first voltage judgment step when the residual voltage measuring device 10000 is operating with constant power, and the first voltage judgment step is performed on the first voltage judgment step. A measured voltage comparison step of comparing the magnitude of the voltage measured at the location and the voltage measured at the second location; A first judgment step of determining whether the larger measured voltage is less than or equal to a preset first reference voltage; And a second determination step of determining whether the smaller measured voltage is more than a preset second reference voltage; and determining a color to be displayed on the LED unit 2600 based on the result of the first voltage determination step. do.

Specifically, when the control unit 2200 is receiving driving power through the constant power input unit 1310, that is, when the connected switchgear is in operation, the control unit 2200 may perform the first voltage determination step as follows.

The control unit 2200 controls a total of four voltages (R-phase power line, S-phase power line, T-phase power line, and residual voltage in the neutral line) measured at the first location and a total of four voltages measured at the second location. All sizes are compared (S10), and the largest voltage among a total of eight pieces of residual voltage information is set as V _H , and the smallest voltage is designated as V _L (S11).

Thereafter, the control unit 2200 determines whether the V _L exceeds the first reference voltage (S12), and if the V _L exceeds the first reference voltage, the control unit 2200 determines that the voltage inside the switchgear is in an overvoltage state. . If V _L is less than or equal to the first reference voltage, the control unit 2200 determines whether V _H exceeds the first reference voltage (S13). If V _H exceeds the first reference voltage, It is determined that the voltage inside the switchgear is in an overvoltage state.

The control unit 2200 determines whether V _L and V _H are less than the first reference voltage and V _H is less than the second reference voltage (S14). If V _H is less than the second reference voltage, the control unit 2200 It is determined that the voltage inside the switchgear is in a low voltage state. When V _L and V _H are less than or equal to the first reference sum and V _H is greater than or equal to the second reference sum, the control unit 2200 determines whether V _L is less than the second reference sum (S15), and When V _L is less than the second reference voltage, the voltage inside the switchboard is determined to be in a low voltage state, and when V _L is greater than the second reference voltage, the state inside the switchgear is determined to be normal.

According to one embodiment of the present invention, the first reference voltage is preferably set to +10% of the normal voltage, and the second reference voltage is preferably set to -10% of the normal voltage.

Meanwhile, the control unit 2200 emits light including a command to turn on or maintain an off state for each LED element included in the first LED unit according to the performance result (overvoltage, undervoltage, normal) of the first voltage judgment step. A signal can be transmitted, and in one embodiment of the present invention, a light emitting signal is transmitted to the second LED unit to display different colors, and the second LED unit displays a first color, a second color, and a light emitting signal according to the light emitting signal. It can emit light in one of the third colors.

Figure 11 schematically shows the execution steps of the second voltage determination step according to an embodiment of the present invention.

As shown in FIG. 11, when the residual voltage measuring device 10000 is operating as an auxiliary power source, a second voltage judgment step is performed, and the second voltage judgment step is performed by measuring the voltage measured at the first location and the second voltage judgment step. A measured voltage comparison step of comparing the magnitude of the voltage measured at two positions; And a third judgment step of determining whether the larger measured voltage is more than a preset third reference voltage; and determining a color to be displayed on the LED unit 2600 based on the result of the second voltage judgment step. do.

Specifically, when the control unit 2200 is receiving driving power through the auxiliary power port 2130, that is, when the connected switchgear is in a power outage, the control unit 2200 may perform the second voltage determination step as follows.

The control unit 2200 controls a total of four voltages (R-phase power line, S-phase power line, T-phase power line, and residual voltage in the neutral line) measured at the first location and a total of four voltages measured at the second location. All sizes are compared (S20), and the largest voltage among a total of eight residual voltage information is set as V _H , and the smallest voltage is designated as V _L (S21).

Thereafter, the control unit 2200 determines whether the V _H exceeds the third reference voltage (S22), and if the V H exceeds the third reference voltage, it determines that a residual voltage exists inside the switchgear. Conversely, when V _H is less than or equal to the third reference voltage, the control unit 2200 determines that there is no residual voltage inside the switchgear. Referring to the description of FIGS. 8 to 9, when it is determined that there is no residual voltage inside the switchgear, the control unit 2200 may transmit a first light-emitting signal to the second LED unit, and inside the switchboard. If it is determined that a residual voltage exists, the control unit 2200 may transmit a second light-emitting signal to the first LED unit.

According to one embodiment of the present invention, a worker can check the residual voltage status from outside even without opening the door of the switchboard, which has the effect of shortening work time.

According to one embodiment of the present invention, a worker can check the residual voltage status from outside even without opening the door of the switchboard, which has the effect of preventing various safety accidents that may occur when the door is opened.

According to one embodiment of the present invention, by measuring the residual voltage in duplicate, it is possible to measure more accurately than by measuring the residual voltage singly, which has the effect of preventing safety accidents due to residual voltage.

According to one embodiment of the present invention, by measuring the voltage from two independent voltage measuring units for the doubly measured residual voltage, even if one voltage measuring unit fails, the residual voltage can be measured from the remaining voltage measuring unit. This can be effective in preventing safety accidents caused by residual voltage.

According to one embodiment of the present invention, necessary information can be intuitively provided only with a predetermined LED element without a separate display device, and the structure can be simplified to enable simple insertion into the door panel of the switchgear, resulting in easy installation. there is.

According to one embodiment of the present invention, by using a substrate and device of a size and quantity optimized for performing the function of measuring residual voltage, it is possible to minimize production costs and facilitate installation.

As described above, although the embodiments have been described with limited examples and drawings, various modifications and variations can be made by those skilled in the art from the above description. For example, the described techniques are performed in a different order than the described method, and/or components of the described system, structure, device, circuit, etc. are combined or combined in a different form than the described method, or other components are used. Alternatively, appropriate results may be achieved even if substituted or substituted by an equivalent. Therefore, other implementations, other embodiments, and equivalents of the claims also fall within the scope of the claims described below.

Claims (8)

As a device for measuring residual voltage in a switchgear,
A board that has a shape that is inserted into the enclosure of the switchgear and is electrically connected to an information display unit that provides the user with information about the residual voltage present inside the switchgear and a bus bar having a three-phase, four-wire wiring structure provided inside the switchboard. A case portion including a cover surrounding the portion, wherein the information display portion is exposed to be visible from the outside of the switchgear; and
It includes a substrate portion provided inside the case portion,
The substrate part,
A connection part for dual connection to the bus bar including an R-phase power line, an S-phase power line, a T-phase power line, and a neutral line; and
A first substrate unit including a switching unit that sequentially transfers power input from each of the R-phase power line, S-phase power line, T-phase power line, and neutral line to a voltage measurement unit; and
a voltage measurement unit that measures the input voltage based on the power transmitted through the switching unit and independently measures the voltage for each power input through the dually connected connection unit;
a control unit that derives information about the residual voltage based on the measured residual voltage;
A communication unit that performs communication with an external terminal; and
An LED unit including a plurality of LEDs that display information about the residual voltage generated based on the measured voltage in different colors according to a preset standard; a second substrate unit including a;
The first substrate portion and the second substrate portion are physically separate substrates and are electrically connected through a plurality of connection lines,
The connection part is,
a first connection part connected to a first position of the busbar;
a first step-down unit connected to the first connection unit and lowering the voltage input through the first connection unit;
a second connection portion connected to a second location of the busbar; and
It includes a second step-down unit connected to the second connection unit and lowering the voltage input through the second connection unit,
Each of the first connection part and the second connection part is individually connected to each of the R-phase power line, S-phase power line, T-phase power line, and neutral line,
The voltage measuring unit includes a first voltage measuring unit and a second voltage measuring unit,
The switching unit,
The voltage input at the first position of the R-phase power line, the voltage input at the first position of the S-phase power line, the voltage input at the first position of the T-phase power line, and the voltage input from the neutral line. a first switching unit sequentially transmitting data to the first voltage measuring unit according to preset rules; and
The voltage input at the second position of the R-phase power line, the voltage input at the second position of the S-phase power line, the voltage input at the second position of the T-phase power line, and the voltage input from the neutral line. It includes a second switching unit that sequentially transmits to the second voltage measuring unit according to preset rules,
Each of the first voltage measurement unit and the second voltage measurement unit measures the received voltage and transmits information about the measured voltage to the control unit,
The control unit,
When the residual voltage measuring device is operating with constant power, a first voltage judgment step is performed,
The first voltage determination step is,
A measured voltage comparison step of comparing the magnitude of the voltage measured at the first location and the voltage measured at the second location;
A first judgment step of determining whether the larger measured voltage is less than or equal to a preset first reference voltage; and
It includes a second determination step of determining whether the smaller measured voltage is more than a preset second reference voltage,
A switchboard residual voltage measuring device that determines a color displayed on the LED unit based on the results of the first voltage determination step.
In claim 1,
The information display unit,
An LED display unit that displays the status according to the presence or absence of residual voltage inside the switchgear;
A safety test button that performs a safety test on the switchboard; and
An auxiliary power port connected to an external auxiliary power source to supply power to the residual voltage measuring device.
In claim 2,
A plurality of LED elements included in the LED unit and installed in the central portion of the front surface of the second substrate unit,
The control unit determines that there is no residual voltage inside the switchgear and receives a first light-emitting signal generated to emit light in a first color,
The control unit determines that there is residual voltage inside the switchgear and receives a second light emission control signal generated to emit light in a second color different from the first color,
The first and second colors emitted from a plurality of LED elements installed in the central portion are exposed to the user through the LED display unit.
In claim 1,
The first substrate unit further includes a power supply unit that continuously supplies power to the residual voltage measuring device,
The power supply unit,
A constant power input unit that receives driving power of the residual voltage measuring device from the power line of the connected switchgear;
An SMPS unit that converts AC power supplied through the constant power input unit into DC power; and
A power supply unit that supplies direct current power received from the SMPS unit as the supply power of the residual voltage measuring device.
delete delete delete As a device for measuring residual voltage in a switchgear,
A board that has a shape that is inserted into the enclosure of the switchgear and is electrically connected to an information display unit that provides the user with information about the residual voltage present inside the switchgear and a bus bar having a three-phase, four-wire wiring structure provided inside the switchboard. A case portion including a cover surrounding the portion, wherein the information display portion is exposed to be visible from the outside of the switchgear; and
It includes a substrate portion provided inside the case portion,
The substrate part,
A connection part for dual connection to the bus bar including an R-phase power line, an S-phase power line, a T-phase power line, and a neutral line; and
A first substrate unit including a switching unit that sequentially transfers power input from each of the R-phase power line, S-phase power line, T-phase power line, and neutral line to a voltage measurement unit; and
a voltage measurement unit that measures the input voltage based on the power transmitted through the switching unit and independently measures the voltage for each power input through the dually connected connection unit;
a control unit that derives information about the residual voltage based on the measured residual voltage;
A communication unit that performs communication with an external terminal; and
An LED unit including a plurality of LEDs that display information about the residual voltage generated based on the measured voltage in different colors according to a preset standard; a second substrate unit including a;
The first substrate portion and the second substrate portion are physically separate substrates and are electrically connected through a plurality of connection lines,
The connection part is,
a first connection part connected to a first position of the busbar;
a first step-down unit connected to the first connection unit and lowering the voltage input through the first connection unit;
a second connection portion connected to a second location of the busbar; and
It includes a second step-down unit connected to the second connection unit and lowering the voltage input through the second connection unit,
Each of the first connection part and the second connection part is individually connected to each of the R-phase power line, S-phase power line, T-phase power line, and neutral line,
The voltage measuring unit includes a first voltage measuring unit and a second voltage measuring unit,
The switching unit,
The voltage input at the first position of the R-phase power line, the voltage input at the first position of the S-phase power line, the voltage input at the first position of the T-phase power line, and the voltage input from the neutral line. a first switching unit sequentially transmitting data to the first voltage measuring unit according to preset rules; and
The voltage input at the second position of the R-phase power line, the voltage input at the second position of the S-phase power line, the voltage input at the second position of the T-phase power line, and the voltage input from the neutral line. It includes a second switching unit that sequentially transmits to the second voltage measuring unit according to preset rules,
Each of the first voltage measurement unit and the second voltage measurement unit measures the received voltage and transmits information about the measured voltage to the control unit,
The control unit,
When the residual voltage measuring device is operating as an auxiliary power source, a second voltage determination step is performed,
The second voltage judgment step is,
A measured voltage comparison step of comparing the magnitude of the voltage measured at the first location and the voltage measured at the second location; and
A third judgment step of determining whether the larger measured voltage is higher than the preset third reference voltage,
A switchboard residual voltage measuring device that determines a color displayed on the LED unit based on the results of the second voltage determination step.

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