Apparatus for power meter with safety accident prevention function

Abstract

The present invention provides a power meter testing device and a power meter testing method using the same for efficiently carrying out verification work before installing a power meter to prevent internal damage to the power meter caused by short circuits or ground faults. The power meter testing device includes i) a casing, ii) a first terminal connection part, iii) a second terminal connection part, iv) a first switch part, v) a second switch part, vi) a resistor part applied to form a closed circuit connected to each of a plurality of switches and a plurality of other switches, vii) a control part connected to each of a plurality of switches and a plurality of other switches, viii) a measuring part applied to measure a resistance value applied to the resistor part and connected to each of the resistor part and the control part, respectively, and ix) a fault alarm part applied to indicate that there is an abnormality in either a 3-phase 4-wire standalone power meter or a transformer power meter that forms a closed circuit with the resistor part when the resistance measured by the measuring part is less than a preset value.

Description

Technology Field

[0001] The present invention relates to an electric meter testing device and an electric meter testing method using the same. More specifically, the present invention relates to an electric meter testing device and an electric meter testing method using the same for efficiently conducting verification work before installation of an electric meter to prevent internal damage to the electric meter caused by short circuits or ground faults. Background Technology

[0002] An electricity meter is a device that measures the amount of power consumed by a load, displaying readings in kilowatt-hours (kWh) to measure real-time power usage. Electricity meters are used in residential, commercial, or industrial environments to monitor energy consumption and efficiently manage electricity usage.

[0003] Recently, damage to electricity meters and fires caused by short circuits or ground faults have been occurring frequently during installation. Therefore, pre-installation inspection of electricity meters is necessary. To this end, a standard tester is used to measure the resistance value of the meter to determine if there is an abnormality. However, for 3-phase 4-wire transformer-based electricity meters, 30 measurements are required, and since judgment criteria vary by measurement terminal, it is inconvenient to verify standards when changing terminals. Furthermore, as measuring and judging electricity meters takes a considerable amount of time, there are cases where some or all measurements are omitted during installation.

[0004] Figure 11 schematically illustrates the method of identifying wires and erroneous connections according to internal wiring regulations. More specifically, the upper part of Figure 11 schematically illustrates the method of identifying wires according to the Korean Electrical Equipment Regulation (KEC) 121.2 and Internal Wiring Regulation 1420-4, and the lower part of Figure 11 schematically illustrates the normal connection state and erroneous connection state of a 3-phase 4-wire standalone power meter.

[0005] As illustrated in the upper part of Fig. 13, according to Korean Electrical Installation Regulations (KEC) 121.2, L1 is brown, L2 is black, L3 is gray, and N is blue, while the protective conductor is a mixture of green and yellow. Additionally, according to Internal Wiring Regulation 1420-4, Phase A is black, Phase B is red, Phase C is blue, and Phase N is white or gray. In the normal wiring shown in the lower part of Fig. 13, the wires are connected to comply with these regulations. However, in the erroneous wiring shown in the lower part of Fig. 13, it can be seen that the secondary Phases A, C, and N are incorrectly connected. In other words, conventionally, electricity meters frequently caused errors due to such erroneous wiring. The problem to be solved

[0006] To prevent internal damage to the electricity meter caused by short circuits or ground faults, we intend to provide an electricity meter testing device for efficiently conducting verification work prior to installation. Additionally, we intend to provide an electricity meter testing method using the aforementioned electricity meter testing device. means of solving the problem

[0007] A power meter test device according to one embodiment of the present invention The power meter is automatically tested. The power meter is either i) a three-phase four-wire standalone power meter including 1S terminal, 2S terminal, 3S terminal, 0S terminal, 1S terminal, 0L terminal, 3L terminal, 2L terminal, and 1L terminal, and ii) a transformer-equipped power meter including another 1S terminal, P1 terminal, another 2S terminal, P2 terminal, another 3S terminal, P3 terminal, P0 terminal, another 3L terminal, another 2L terminal, and another 1L terminal.

[0008] The power meter testing device comprises: i) a casing; ii) a first terminal connection part protruding from the casing and including another 1S connection terminal, P1 connection terminal, 2S connection terminal, P2 connection terminal, 3S connection terminal, P3 connection terminal, P0 connection terminal, 3L connection terminal, 2L connection terminal, and 1L connection terminal, each formed corresponding to terminals included in a transformer-type power meter; iii) a second terminal connection part protruding from the casing and including another 1S connection terminal, another 2S connection terminal, another 3S connection terminal, 0S connection terminal, 0L connection terminal, another 3L connection terminal, another 2L connection terminal, and another 1L connection terminal, each formed corresponding to terminals included in a three-phase four-wire-type standalone power meter; iv) a first switch part including a plurality of switches applied to be connected to a plurality of terminals of either a three-phase four-wire-type standalone power meter or a transformer-type power meter; and v) another plurality of switches connected in parallel with the plurality of switches. It may include a second switch unit, vi) a resistor unit applied to form a closed circuit connected to each of a plurality of switches and a plurality of other switches, vii) a control unit connected to each of a plurality of switches and a plurality of other switches, viii) a measuring unit applied to measure a resistance value applied to the resistor unit connected to each of the resistor unit and the control unit, and ix) a fault alarm unit applied to indicate that there is a fault in either the 3-phase 4-wire standalone power meter and the transformer unit power meter that form a closed circuit with the resistor unit when the resistance measured by the measuring unit is less than a preset value.

[0009] The first terminal connection part and the second terminal connection part may protrude from the casing in mutually opposite directions. In paragraph 2, i) a 2S connection terminal and another 1L connection terminal, ii) a P2 connection terminal and another 2L connection terminal, iii) a 3S connection terminal and another 3L connection terminal, iv) a P3 connection terminal and an 0L connection terminal, v) a P0 connection terminal and an 0S connection terminal, vi) a 3L connection terminal and another 3S connection terminal, vii) a 2L connection terminal and another 2S connection terminal, and viii) a 1L connection terminal and another 1S connection terminal may each be positioned side by side along the aforementioned directions. For the 1S connection terminal and the P1 connection terminal, there may not be any terminals positioned side by side along the respective directions. The 1S connection terminal and the P1 connection terminal may be adjacent to a fault alarm unit. The fault alarm unit includes an LED indicator, and if there is an abnormality, the LED indicator may flash red. The fault alarm unit further includes another LED indicator, and when the power meter is normal, the other indicator may light up green. The fault alarm unit further includes an LCD display, and an abnormal terminal may be displayed on the LCD display.

[0010] One or more of the plurality of connection terminals included in the first terminal connection part may include i) a terminal part applied to protrude outwardly through an opening formed in the casing and connect to the terminals, and ii) a rotating body part connected to the terminal part and fixed within the casing and applied to rotate. The connection terminal may further include a protrusion formed on the rotating body part, and the rotating body part is fixed to a fixed ring formed inside the casing and rotates, and a pair of rotation limiting pieces are formed within the fixed ring with the protrusion between them, and the protrusion may be blocked by the pair of rotation limiting pieces to restrict the rotation of the rotating body part.

[0011] A test method for a power meter according to one embodiment of the present invention utilizes the power meter test device described above. A first switch unit includes a first-1 switch, and a second switch unit includes a second-10 switch. The test method for a power meter comprises: i) connecting the power meter test device to the power meter; ii) closing the first-1 switch connected to another 1S terminal; iii) closing the second-10 switch connected to another 1L terminal to form a closed circuit with a resistor unit; iv) measuring unit measuring the resistance value of the resistor unit; v) a control unit determining whether the closed circuit is short-circuited according to the resistance value; and vi) recognizing the power meter as a transformer unit power meter when the closed circuit is short-circuited.

[0012] The first switch unit may further include switches 1-2 through 1-10 connected respectively to a P1 connection terminal, another 2S connection terminal, a P2 connection terminal, another 3S connection terminal, a P3 connection terminal, a P0 connection terminal, another 3L connection terminal, another 2L connection terminal, and another 1L connection terminal. The second switch unit may further include switches 2-1 through 2-9 connected respectively to a 1S connection terminal, a P1 connection terminal, another 2S connection terminal, a P2 connection terminal, another 3S connection terminal, a P3 connection terminal, a P0 connection terminal, another 3L connection terminal, and another 2L connection terminal. A test method for an electricity meter comprises: i) interconnecting terminal P1 with terminals P2, P3, and P0 in sequence, respectively, and a measuring unit measuring the resistance value of a resistance unit; ii) interconnecting terminal P2 with terminals P3 and P0 in sequence, respectively, and a measuring unit measuring the resistance value; iii) interconnecting terminal P3 with terminal P0 in sequence. The method may further include a step in which a measuring unit measures a resistance value, and iv) a step in which, if one or more of the measured resistance values ​​are less than a preset value, a fault alarm unit indicates that there is a problem with the transformer unit power meter.

[0013] In the step of notifying that there is a malfunction in the transformer unit power meter, the preset value may be 30 kΩ. In the step of the fault alarm unit notifying that there is a malfunction in the transformer unit power meter, terminals corresponding to resistance values ​​below the preset value may be displayed as malfunctions on the LCD display included in the fault alarm unit. If one of the terminals is included together with another terminal and the measured resistance value is greater than or equal to the preset value, only the remaining terminals, excluding the one terminal, may be displayed as malfunctions on the LCD display. In the steps of measuring the resistance value of the resistor unit, a step of disconnecting the connection may be performed after connecting each terminal and measuring the resistance value.

[0014] In the step where the fault alarm unit indicates that there is an abnormality in the transformer unit power meter, the LED indicator included in the fault alarm unit may flash red. The test method of a power meter according to one embodiment of the present invention may further include the step of the fault alarm unit indicating that the transformer unit power meter is normal when the measured resistance values ​​are each greater than or equal to a preset value.

[0015] A test method for an electric power meter according to an embodiment of the present invention comprises: i) interconnecting another 1S terminal with terminals P1, P2, P3, and P0 in sequence, respectively, and a measuring unit measuring the resistance value of a resistance unit; ii) interconnecting another 1L terminal with terminals P1, P2, P3, and P0 in sequence, respectively, and a measuring unit measuring the resistance value of a resistance unit; iii) interconnecting another 2S terminal with terminals P1, P2, P3, and P0 in sequence, respectively, and a measuring unit measuring the resistance value of a resistance unit; iv) interconnecting another 2L terminal with terminals P1, P2, P3, and P0 in sequence, respectively, and a measuring unit measuring the resistance value of a resistance unit; v) interconnecting another 3S terminal with terminals P1, P2, P3, and P0 in sequence, respectively, and a measuring unit measuring the resistance value of a resistance unit; vi) connecting another 3L terminal with terminals P1, P2, P3, and P0 in sequence The method may further include the steps of interconnecting in sequence and measuring the resistance value of the resistance unit, and vii) if any one or more of the measured resistance values ​​are less than a preset value, the fault alarm unit notifies that there is a fault in the transformer unit power meter. The preset value may be 30 kΩ.

[0016] The transformer-type power meter may further include an enclosure housing another 1S terminal, a P1 terminal, another 2S terminal, a P2 terminal, another 3S terminal, a P3 terminal, a P0 terminal, another 3L terminal, another 2L terminal, and another 1L terminal. A test method for a power meter according to an embodiment of the present invention may further include: i) connecting one of the terminals to the enclosure and a measuring unit measuring the resistance value of a resistance unit; and ii) if the measured resistance value is less than a preset value, a fault alarm unit indicating that there is a fault in the transformer-type power meter. In the step of indicating that there is a fault in the transformer-type power meter, the preset value may be 5 MΩ. In the step of indicating that there is a fault in the transformer-type power meter, an LED indicator included in the fault alarm unit may flash red.

[0017] The first switch unit may further include a first-2 switch connected to a 1S terminal, and the second switch unit may further include a second-9 switch connected to a 3L terminal. A test method for a power meter according to an embodiment of the present invention may further include: i) a step of opening the first-1 switch and the second-10 switch, respectively, when the closed circuit is open; ii) a step of closing the first-2 switch and closing the second-9 switch to form another closed circuit with the resistance unit; iii) a step of measuring the resistance value of the resistance unit; iv) a step of determining whether the other closed circuit is short-circuited according to the resistance value; and v) a step of recognizing the power meter as a 3-phase 4-wire single power meter when the other closed circuit is short-circuited. The first switch unit may further include switches 1-3 to 1-9 connected to another 2S connection terminal, a P2 connection terminal, another 3S connection terminal, a P3 connection terminal, a P0 connection terminal, another 3L connection terminal, and another 2L connection terminal, respectively. The second switch section may further include switches 2-1 to 2-8 connected to a 1S connection terminal, a P1 connection terminal, another 2S connection terminal, a P2 connection terminal, another 3S connection terminal, a P3 connection terminal, a P0 connection terminal, and another 3L connection terminal, respectively.A test method for an electric power meter according to an embodiment of the present invention comprises: i) connecting a 1S terminal, a 3S terminal, an 0S terminal, an 0L terminal, a 3L terminal, and a 2L terminal in sequence to each other, and a measuring unit measuring the resistance value of a resistance unit; ii) connecting a 2S terminal, a 3S terminal, an 0S terminal, an 0L terminal, a 3L terminal, and a 2L terminal in sequence to each other, and a measuring unit measuring the resistance value of a resistance unit; iii) connecting a 2S terminal, an 0S terminal, an 0L terminal, a 3L terminal, and a 1L terminal in sequence to each other, and a measuring unit measuring the resistance value of a resistance unit; iv) connecting a 3S terminal, an 0S terminal, an 0L terminal, a 3L terminal, and a 1L terminal in sequence to each other, and a measuring unit measuring the resistance value of a resistance unit; v) connecting a 3S terminal, an 0L terminal, a 2L terminal, and a 1L terminal in sequence to each other, and a measuring unit measuring the resistance value of a resistance unit; vi) connecting an 0S terminal and an 0L terminal, The method may further include the steps of: interconnecting the 2L terminal and the 1L terminal in sequence and measuring the resistance value of the resistance unit; vii) interconnecting the 0S terminal, the 2L terminal, and the 1L terminal in sequence and measuring the resistance value of the resistance unit; viii) interconnecting the 3L terminal, the 2L terminal, and the 1L terminal in sequence and measuring the resistance value of the resistance unit; and ix) if any one or more of the measured resistance values ​​are less than a preset value, the fault alarm unit may notify that there is a fault in the 3-phase 4-wire standalone power meter. In the step of notifying that there is a fault in the 3-phase 4-wire standalone power meter, the preset value may be 30 kΩ.

[0018] In the step of indicating a fault in a 3-phase 4-wire standalone power meter, terminals corresponding to resistance values ​​below a preset value may be displayed as faulty on the LCD display included in the fault alarm unit. If one of the terminals is included together with another terminal and the measured resistance value is greater than or equal to the preset value, only the remaining terminals excluding that one terminal may be displayed as faulty on the LCD display.

[0019] In the steps of measuring the resistance value of the resistance part, a step of disconnecting the connection after connecting each terminal and measuring the resistance value may be performed. The test method of a power meter according to one embodiment of the present invention may further include a step in which, if the measured resistance values ​​are each greater than or equal to a preset value, a fault alarm unit indicates that the 3-phase 4-wire standalone power meter is normal.

[0020] A test method for an electric power meter according to one embodiment of the present invention may further include the step of connecting a second terminal connection part to a three-phase four-wire standalone electric power meter. The three-phase four-wire standalone electric power meter may further include an enclosure housing a 1S terminal, a 2S terminal, a 3S terminal, an 0S terminal, an 0L terminal, a 3L terminal, a 2L terminal, and a 1L terminal. A test method for an electric power meter according to one embodiment of the present invention may further include i) a step of connecting one of the terminals to the enclosure and a measuring part measuring the resistance value of a resistance part, and ii) a step of a fault alarm part indicating that there is an abnormality in the three-phase four-wire standalone electric power meter if the measured resistance value is less than a preset value. In the step of indicating that there is an abnormality in the three-phase four-wire standalone electric power meter, the preset value may be 5 MΩ. If another closed circuit is not short-circuited, the method may further include a step of a fault control part indicating that the electric power meter is normal. In the step of connecting the power meter test device to the power meter, the second terminal connector can be inserted into the power meter to make the connection. Effects of the invention

[0021] By programming inspection sequences and criteria, the resistance measurement and determination of abnormalities in power meters can be automated using a power meter testing device. As a result, while the manual measurement method previously imposed a heavy workload on workers, the automatic measurement method significantly improves worker convenience. For example, since the process can be switched from a manual method requiring up to 30 measurements to a single automatic measurement, work time and workload can be reduced. Furthermore, the installation of abnormal power meters due to worker error can be prevented. Additionally, fires caused by internal abnormalities in newly installed power meters can be preemptively blocked. Moreover, safety accidents involving workers caused by contact between the primary and secondary sides during three-phase operations can be prevented. Brief explanation of the drawing

[0022] FIG. 1 is a schematic block diagram of a power meter test device according to one embodiment of the present invention. FIG. 2 is a schematic perspective view of a power meter test device according to one embodiment of the present invention. Figure 3 is a schematic plan view of the power meter test device of Figure 2. Figure 4 is a schematic diagram showing the state of the power meter before and after connection of the power meter of the power meter test device of Figure 3. FIG. 5 is a schematic flowchart of a power meter test method according to one embodiment of the present invention. FIGS. 6 to 11 are schematic internal circuit diagrams of a power meter test device for the power meter type determination step of FIG. 5. Figure 12 is a schematic internal circuit diagram of a transformer-type power meter. Figure 13 is a schematic internal circuit diagram of a three-phase four-wire standalone power meter. FIG. 14 is a schematic diagram showing the method of identifying wires and erroneous connections according to internal wiring regulations. Specific details for implementing the invention

[0023] Embodiments of the present disclosure are described below with reference to the attached drawings so that those skilled in the art can easily implement them. However, the present disclosure may be embodied in various different forms and is not limited to the embodiments described herein. Furthermore, in order to clearly explain the present disclosure in the drawings, parts unrelated to the explanation have been omitted, and similar parts throughout the specification are denoted by similar reference numerals.

[0024] In the specification, when a part is described as "including" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components. Furthermore, terms such as "...part," "...unit," and "...module" as used in the specification refer to a unit that processes at least one function or operation.

[0025] In this specification, terms including ordinal numbers, such as first, second, etc., may be used to describe various components, but these components are not limited by these terms. These terms are used solely for the purpose of distinguishing one component from another. For example, without departing from the scope of the present disclosure, the first component may be named the second component, and similarly, the second component may be named the first component.

[0026] In the flowchart described with reference to the drawings in this specification, the order of operations may be changed, several operations may be merged or some operations may be divided, and certain operations may not be performed.

[0027] FIG. 1 schematically illustrates a block diagram of a power meter test device (100) according to one embodiment of the present invention. The block diagram of FIG. 1 is merely for illustrating the present invention and is not limited thereto. Accordingly, the block diagram of FIG. 1 can be modified differently.

[0028] As illustrated in FIG. 1, the power meter test device (100) operates by connecting to the power meter (PM). That is, the power meter test device (100) connects to the terminals of the power meter (PM) to determine whether the power meter (PM) is normal or abnormal. FIG. 1 illustrates that the power meter (PM) includes both terminals for a 3-phase 4-wire standalone power meter and terminals for a transformer-equipped power meter, but this is merely for convenience, and the power meter (PM) may be either a 3-phase 4-wire standalone power meter or a transformer-equipped power meter. As a result, the power meter test device (100) can be used to determine whether the power meter (PM) is a 3-phase 4-wire standalone power meter or a transformer-equipped power meter.

[0029] The 3-phase 4-wire standalone power meter includes multiple terminals (1S, 2S, 3S, 0S, 0L, 3L, 2L, 1L), and the transformer-equipped power meter also includes multiple terminals (1S, P1, 2S, P2, 3S, P3, P0, 3L, 2L, 1L). The 3-phase 4-wire standalone power meter and the transformer-equipped power meter may include other components in addition.

[0030] As illustrated in FIG. 1, the power meter test device (100) includes a first switch unit (10), a second switch unit (20), a resistor unit (30), a control unit (40), a measuring unit (50), a fault alarm unit (60), a casing (70) (illustrated in FIG. 2), a first terminal connection unit (80), and a second terminal connection unit (90). In addition, the power meter test device (100) may include other components.

[0031] The first switch unit (10) is connected to a plurality of terminals included in a three-phase four-wire standalone power meter or a transformer power meter. That is, the switches (SW 1-1, SW 1-2, SW 1-3, SW 1-4, SW 1-5, SW 1-6, SW 1-7, SW 1-8, SW 1-9, SW 1-10) included in the first switch unit (10) are connected to terminals (1S, 2S, 3S, 0S, 0L, 3L, 2L, 1L) included in the three-phase four-wire standalone power meter or to terminals (1S, P1, 2S, P2, 3S, P3, P0, 3L, 2L, 1L) included in the transformer power meter. Figure 1 shows 10 switches as an example. Eight switches (SW 1-2, SW 1-3, SW 1-4, SW 1-5, SW 1-6, SW 1-7, SW 1-8, SW 1-9) can be connected to the terminals (1S, 2S, 3S, 0S, 0L, 3L, 2L, 1L) included in the 3-phase 4-wire standalone power meter in correspondence. Meanwhile, ten switches (SW 1-1, SW 1-2, SW 1-3, SW 1-4, SW 1-5, SW 1-6, SW 1-7, SW 1-8, SW 1-9, SW 1-10) can be connected to the terminals (1S, P1, 2S, P2, 3S, P3, P0, 3L, 2L, 1L) included in the transformer power meter in correspondence.

[0032] Meanwhile, a second switch unit (20) may be connected in parallel with the first switch unit (10) to a three-phase four-wire standalone power meter or a transformer unit power meter. A resistor unit (30) is connected to each switch included in the first switch unit (10) and each switch included in the second switch unit (20). To determine whether there is an abnormality in the power meter (PM), one switch of the first switch unit (10) and one switch of the second switch unit (20) are closed to form a closed circuit with the resistor of the resistor unit (30), thereby determining whether there is an abnormality in the terminals of the power meter.

[0033] The control unit (40) is connected to the first switch unit (10) and the second switch unit (20) to control the opening and closing of each switch. By the control unit (40), only one switch among the switches included in the first switch unit (10) is selected and closed, and only one switch among the switches included in the second switch unit (20) is selected and closed, so that the abnormality of the power meter (PM) can be checked.

[0034] The measuring unit (50) is connected to the resistance unit (30) and the control unit (40). When a closed circuit is formed, the measuring unit (50) can measure the resistance value of the resistance unit (30). If the measured resistance value is less than the preset value, it can be seen that normal current does not flow into the power meter (PM) due to a short circuit, and a large amount of current flows bypassing through the power meter test device (100). Therefore, it can be determined that an abnormality has occurred in the corresponding terminals.

[0035] The fault alarm unit (60) can indicate that the power meter (PM) forming a closed circuit with the resistance unit (30) is faulty, i.e., defective, when the resistance measured by the measuring unit (50) is less than the preset value. If there is a fault in the power meter (PM), the LED can be displayed in red to indicate this to the outside, and the terminal with the fault can be displayed using an LCD display.

[0036] As illustrated in FIG. 1, the first terminal connection part (80) includes 10 connection terminals. Here, the 10 connection terminals may correspond to 10 transformer power meter terminals (1S, P1, 2S, P2, 3S, P3, P0, 3L, 2L, 1L) and may be a 1S connection terminal, a P1 connection terminal, a 2S connection terminal, a P2 connection terminal, a 3S connection terminal, a P3 connection terminal, a P0 connection terminal, a 3L connection terminal, a 2L connection terminal, and a 1L connection terminal. The first terminal connection part (80) can be used for a transformer power meter.

[0037] Meanwhile, the second terminal connection section (90) includes eight connection terminals. Here, the eight connection terminals may correspond to eight transformer-type power meter terminals (1S, 2S, 3S, 0S, 0L, 3L, 2L, 1L) and may be a 1S connection terminal, a 2S connection terminal, a 3S connection terminal, an 0S connection terminal, a 3L connection terminal, a 2L connection terminal, and a 1L connection terminal. The second terminal connection section (90) can be used for a three-phase four-wire standalone power meter. The first terminal connection section (80) and the second terminal connection section (90) can be used according to the type of power meter to be tested. Fine adjustment is possible if there is a difference in spacing between terminals depending on the manufacturer.

[0038] FIG. 2 schematically shows a perspective view of a power meter test device (100) according to one embodiment of the present invention. The enlarged circle of FIG. 2 shows an enlarged view of the structure of a connection terminal (801) included in the first terminal connection part (80). The structure of the power meter test device (100) of FIG. 2 is merely for illustrating the present invention and is not limited thereto. Accordingly, the structure of the power meter test device (100) can be modified differently.

[0039] As illustrated in FIG. 2, various components are built into the casing (70). Specifically, a first terminal connection part (80) protrudes from the lower side of the casing (70), and a second terminal connection part (90) protrudes from the upper side of the casing (70). The first terminal connection part (80) is used to test a three-phase four-wire standalone power meter, and the second terminal connection part (90) is used to test a transformer power meter.

[0040] As illustrated in the enlarged circle of FIG. 2, the connection terminal (801) included in the first terminal connection part (80) is a 1S connection terminal and includes a terminal part (8011), a rotating body part (8013), and a protrusion part (8015). The rotating body part (8013) is fixed within the casing (70) and can rotate in the direction of the arrow. As a result, the terminal part (8011) can be adjusted so that it protrudes outward through the opening (701) and corresponds to the spacing distance of the terminals of the power meter when connected to them. Therefore, even if the spacing distance of the terminals varies slightly depending on the manufacturer of the power meter, the power meter test device (100) can be properly connected to the power meter by adjusting the connection terminal (801). A protrusion part (8015) is formed on the rotating body part (8013). The protrusion part (8015) is formed in the shape of a rectangular parallelepiped. The rotating body part (8013) is fixed to the fixed ring part (703) formed inside the casing (70) and rotates. Since a pair of rotation limiting pieces (7031) are formed within the fixed ring part (703) with a protrusion (8015) in between, the rotating body part (8013) rotates in the direction of the arrow, but rotation is restricted because the protrusion (8015) is blocked by the pair of rotation limiting pieces (7031). For example, since the rotation angle of the rotating body part (8013) is limited to 60°, interference caused by contact between adjacent terminal parts (8011) can be prevented. Meanwhile, although not shown in FIG. 2, the structure of such a connection terminal (801) can be applied in the same way to the second terminal connection part (90).

[0041] Meanwhile, a power supply unit (75) is installed on the upper surface of the casing (70). By turning the power supply unit (75) ON / OFF, power can be supplied to or stopped from the power meter test device (100). Meanwhile, the fault alarm unit (60) can serve as a display unit. That is, the fault alarm unit (60) includes an LED indicator light (601, 603) and an LCD display window (605). The LED indicator light (601, 603) includes an LED indicator light (601) that lights up red and an LED indicator light (603) that lights up green. As a result, if the power meter connected to and tested by the power meter test device (100) is normal, the LED indicator light (603) lights up to display green. Conversely, if the power meter test device (100) detects that there is a problem with the power meter, the LED indicator light (601) lights up to display red. Along with this, the terminal with a defect is specifically indicated on the LCD display (605). Here, the terminal may be indicated as a pair or as a single terminal due to the test characteristics of the power meter test device (100). That is, if one of the terminals among the pair recognized as having a defect is found to have a resistance value greater than the preset value when measured together with the other terminal, and the terminal is determined to be normal, only the remaining terminal is indicated as having a defect. Meanwhile, the remaining detailed display process of the fault alarm unit (60) is easily understood by a person with ordinary knowledge in the technical field to which the present invention belongs, so a detailed explanation thereof is omitted.

[0042] FIG. 3 schematically shows a plan view of the power meter test device (100) of FIG. 2. The plan view of FIG. 3 is merely for illustrating the present invention and is not limited thereto. Accordingly, the plan view of FIG. 3 can be modified differently.

[0043] As illustrated in FIG. 3, in the first terminal connection section (80), ten connection terminals, namely, connection terminal (1S), connection terminal (P1), connection terminal (2S), connection terminal (P2), connection terminal (3S), connection terminal (P3), connection terminal (P0), connection terminal (3L), connection terminal (2L), and connection terminal (1L), are arranged side by side along the -x-axis direction. The first terminal connection section (80) is used for connecting to test a transformer power meter, namely a CT (current transformer) power meter or a high-voltage power meter. Additionally, in the second terminal connection section (90), eight connection terminals, namely, connection terminal (1S), connection terminal (2S), connection terminal (3S), connection terminal (0S), connection terminal (1S), connection terminal (0L), connection terminal (3L), connection terminal (2L), and connection terminal (1L), are arranged side by side along the x-axis direction. The second terminal connection part (90) is used for connecting to test a three-phase four-wire single power meter.

[0044] The first terminal connection part (80) protrudes in the direction of the -z axis, and the second terminal connection part (90) protrudes in the direction of the +z axis, so that both protrude from the casing (70) in mutually opposite directions. Accordingly, the transformer part power meter can be connected through the lower first terminal connection part (80), and the 3-phase 4-wire single power meter can be connected through the upper second terminal connection part (90), so the power meter test device (100) has a connection structure that is desirable for testing the power meter.

[0045] Meanwhile, as shown in FIG. 2, the lower connection terminal (2S) and the upper connection terminal (1L) are positioned side by side along the z-axis direction. Additionally, the lower connection terminal (P2) and the upper connection terminal (2L), the lower connection terminal (3S) and the upper connection terminal (3L), the lower connection terminal (P3) and the upper connection terminal (0L), the lower connection terminal (P0) and the upper connection terminal (0S), the lower connection terminal (3L) and the upper connection terminal (3S), the lower connection terminal (2L) and the upper connection terminal (2S), and the lower connection terminal (1L) and the upper connection terminal (1S) also form the same positional structure. The lower terminal (1S) and the terminal (P1) are positioned side by side below the fault alarm unit (60). There are no terminals positioned side by side along the z-axis direction between the lower terminal (1S) and the terminal (P1).

[0046] FIG. 4 schematically shows the state of the power meter (PM) of the power meter test device (100) of FIG. 3 before and after connection. The connection state of the power meter test device (100) of FIG. 4 is merely for illustrating the present invention and is not limited thereto. Accordingly, the connection state of the power meter test device (100) of FIG. 4 can be modified differently. FIG. 3 shows a 3-wire 4-phase power meter as an example.

[0047] As illustrated in FIG. 3, the second terminal connection part (90) can be inserted into the power meter (PM) to connect the power meter test device (100) to the power meter (PM). In this case, when the power of the power meter test device (100) is turned on, the power meter (PM) is automatically tested by the power meter test device (100). As a result, if there is a problem with the power meter (PM), the LED indicator (601) flashes red, and the terminal of the power meter (PM) where the problem was found is displayed on the LCD display (605).

[0048] FIG. 5 schematically illustrates a flowchart of a power meter test method according to one embodiment of the present invention. The flowchart of FIG. 5 is merely for illustrating the present invention and is not limited thereto. Accordingly, the flowchart of FIG. 5 may be modified differently.

[0049] As illustrated in FIG. 5, the power meter testing method includes the step (S10) of first connecting the power meter to the power meter testing device and turning on the power of the power meter testing device, and the step (S20) of determining the type of power meter. In these steps, prior to testing the power meter, it is first determined whether the power meter is a three-phase four-wire standalone power meter or a transformer-equipped power meter. First, in step (S10), the power meter is connected to the power meter testing device and the power of the power meter testing device is turned ON. In this case, the first terminal connection part of the power meter testing device is connected to the power meter. The type of power meter can be determined in step (S20) using the first terminal connection part. This will be explained in detail below through FIG. 6 to 10.

[0050] FIGS. 6 to 11 schematically illustrate the internal circuit diagram of a power meter test device for the step of determining the type of power meter of FIG. 5. The internal circuit diagram of the power meter test device of FIGS. 6 to 11 is merely for illustrating the present invention and is not limited thereto. Accordingly, the internal circuit diagram of FIGS. 6 to 11 may be modified differently.

[0051] First, as illustrated in FIG. 6, the type of power meter is initially unknown. Therefore, to determine the type of power meter, a power meter test device (100) is connected to the power meter and the power is turned on. That is, a closed circuit is formed by closing the switch (SW 1-1) and the switch (SW 2-10), which are respectively included in the first switch unit (10) and the second switch unit (20) included in the power meter test device (100). If the power meter (PM) is a transformer-type power meter, the switch (SW 1-1) and the switch (SW 2-10) correspond to both terminals of the transformer-type power meter. In this case, a closed circuit is formed, and the resistance of the resistor unit (30) is lower than the preset value, so a short circuit can be confirmed.

[0052] That is, as illustrated in FIG. 7, when the power meter (PM) is a transformer-type power meter, the terminal (1S) and the terminal (1L) are electrically connected to each other due to their structure. Thus, the terminal (1S) and the terminal (1L) are connected to form a closed circuit with the resistor (30). Here, the switch (SW 1-1) corresponds to the terminal (1S), and the switch (SW 2-10) corresponds to the terminal (1L). Since the resistance value of the resistor (30) appears lower than the preset value due to the short circuit, it can be confirmed through this that the power meter (PM) is a transformer-type power meter.

[0053] FIG. 8 illustrates a case where the resistance value of the resistor (30) appears to be greater than the preset value, so that no short circuit occurs. That is, when the resistance value of the resistor (30) appears higher than the preset value, the terminal (1S) and terminal (1L) can be seen as not existing and open, and no short circuit phenomenon occurs. In this case, since the type of power meter (PM) cannot be determined, a switch change is required.

[0054] Accordingly, as illustrated in FIG. 9, the closed switches (SW 1-1) and (SW 2-10) are opened, and the switches (SW 1-2) and (SW 2-9) are closed. That is, the switches (SW 1-2) and (SW 2-9), respectively included in the first switch unit (10) and the second switch unit (20) included in the power meter test device (100), are closed to form a closed circuit. If the power meter (PM) is a 3-phase 4-wire single power meter, the switches (SW 1-21) and (SW 2-9) correspond to both terminals of the 3-phase 4-wire single power meter. In this case, a closed circuit is formed, and the resistance of the resistor unit (30) is lower than the preset value, so a short circuit can be confirmed.

[0055] That is, as illustrated in FIG. 10, when the power meter (PM) is a three-phase four-wire standalone power meter, the switch (SW 1-2) and the switch (SW 2-9) correspond to the terminal (1S) and terminal (3L) included in the three-phase four-wire standalone power meter, respectively. When the resistance value applied to the resistance part (30) is measured and the resistance value is less than the preset value, it can be seen that a short circuit has occurred, so it can be seen that the terminal (1S) and terminal (3L) are connected and a closed circuit is formed. As a result, the power meter (PM) is identified as a three-phase four-wire standalone power meter.

[0056] Conversely, as illustrated in FIG. 11, if the resistance value is greater than the preset value, it can be considered that no short circuit has occurred. As a result, since it is impossible to determine the power meter (PM) by the power meter test device (100), it is considered that an error has occurred.

[0057] Returning to FIG. 5, if the type of power meter is determined to be a transformer-type power meter in step (S20), the steps on the left side of FIG. 5 are executed. In this case, the automatic test method for the power meter includes the steps of measuring the resistance value between P terminals (S30), determining whether the resistance value is less than 30 kΩ (S40), flashing the LED indicator red in the first mode and indicating the terminal as an abnormal terminal on the LCD display if the resistance value is less than 30 kΩ (S50), measuring the resistance value between terminals other than P terminals and the resistance value between the terminal and the enclosure if the resistance value is 30 kΩ or more (S60), determining whether the resistance value is less than 5 MΩ (S70), flashing the LED indicator red in the second mode and indicating the terminal as an abnormal terminal on the LCD display if the resistance value is less than 5 MΩ (S80), and lighting the LED indicator green if the resistance value is 5 MΩ or more (S90). In addition, the automatic testing method for electricity meters may include other steps. Each step is explained in more detail below.

[0058] In step (S30), the resistance value between the P terminals is measured. That is, the resistance value between the P terminals (P0, P1, P2, P3), which do not exist in the 3-phase 4-wire standalone power meter but exist only in the transformer-equipped power meter, is measured. This is explained in more detail through Fig. 12.

[0059] FIG. 12 schematically illustrates the internal circuit diagram of a transformer-type power meter. More specifically, the transformer-type power meter refers to a G-type 3-phase 4-wire transformer-type electronic power meter. The internal circuit diagram of the transformer-type power meter in FIG. 12 is merely for illustrating the present invention and is not limited thereto. Accordingly, the internal circuit diagram of FIG. 12 can be modified differently.

[0060] As illustrated in FIG. 12, there are 10 terminals (1S, P1, 2S, P2, 3S, P3, P0, 3L, 2L, 1L) inside the transformer-type power meter. Terminal (1S) and terminal (1L) are connected to the first phase. Here, S means supply and L means load. Thus, terminal (1S) is connected to the input supply line of the first phase, and terminal (1L) is connected to the load side of the first phase. Terminal (2S) and terminal (2L) are connected to the second phase in a manner similar to the connection between terminal (1S) and terminal (1L). That is, terminal (2S) is connected to the input supply line of the second phase, and terminal (2L) is connected to the load side of the second phase. Terminal (3S) is connected to the input supply line of the third phase, and terminal (3L) is connected to the load side of the third phase. Terminals (P1, P2, P3) are connected to current transformers (CTs) associated with each phase. P1 is connected to the CT of the first phase, P2 is connected to the CT of the second phase, and P3 is connected to the CT of the third phase. The transformer-mounted power meter can measure the current flowing through each phase for which power consumption calculation is required via the terminals (P1, P2, P3). Terminal (P0) is the common return point of the CTs. Terminal (P0) serves as the neutral point for the CT connections.

[0061] Returning to Fig. 5, in step (S30), the resistance value between the P terminals is measured. That is, in the internal circuit of the transformer-type power meter of Fig. 12 described above, the terminals (P0, P1, P2, P3) are interconnected in sequence as shown below, and the measuring unit measures the resistance value for a total of six cases as shown below. Since only magnetic coupling through the CT can be observed through these terminals and they must not be directly connected to one another or to ground, checking the insulation allows one to verify whether the CT circuit is not damaged and is operating correctly.

[0062] Terminal (P1) - Terminal (P2)

[0063] Terminal (P1) - Terminal (P3)

[0064] Terminal (P1) - Terminal (P0)

[0065] Terminal (P2) - Terminal (P3)

[0066] Terminal (P2) - Terminal (P0)

[0067] Terminal (P3) - Terminal (P0)

[0068] In step (S40), it is determined whether one or more of the measured resistance values ​​are less than a preset value. Here, the preset value may be, for example, 30 kΩ. If the resistance value is less than 30 kΩ, it can be considered that the closed circuit is short-circuited due to a large amount of current flowing through the power meter test device. Therefore, since it can be considered that damage has occurred between the P terminals, in step (S50), the LED indicator may blink red in the first mode, and the terminal may be indicated as an abnormal terminal on the LCD display. For example, the first mode may be a slow blinking of red. Conversely, if the resistance value is greater than or equal to the preset value, the process proceeds to step (S60) to measure the resistance value between terminals other than those between the P terminals measured in the previous step (S30). Additionally, the resistance value between the terminal and the enclosure is also measured. Measuring the resistance between the terminals (1S, 1L, 2S, 2L, 3S, 3L) allows for good mutual connection between the phases or between the phase and the neutral line. In other words, it is possible to verify whether the wiring of the transformer-based power meter complies with specifications and to check for internal short circuits. The combinations for measuring resistance values ​​between terminals other than the P terminals are as follows.

[0069] Terminal (1S) - Terminal (P1)

[0070] Terminal (1S) - Terminal (P2)

[0071] Terminal (1S) - Terminal (P3)

[0072] Terminal (1S) - Terminal (P0)

[0073] Terminal (1L) - Terminal (P1)

[0074] Terminal (1L) - Terminal (P2)

[0075] Terminal (1L) - Terminal (P3)

[0076] Terminal (1L) - Terminal (P0)

[0077] Terminal (2S) - Terminal (P1)

[0078] Terminal (2S) - Terminal (P2)

[0079] Terminal (2S) - Terminal (P3)

[0080] Terminal (2S) - Terminal (P0)

[0081] Terminal (2L) - Terminal (P1)

[0082] Terminal (2L) - Terminal (P2)

[0083] Terminal (2L) - Terminal (P3)

[0084] Terminal (2L) - Terminal (P0)

[0085] Terminal (3S) - Terminal (P1)

[0086] Terminal (3S) - Terminal (P2)

[0087] Terminal (3S) - Terminal (P3)

[0088] Terminal (3S) - Terminal (P0)

[0089] Terminal (3L) - Terminal (P1)

[0090] Terminal (3L) - Terminal (P2)

[0091] Terminal (3L) - Terminal (P3)

[0092] Terminal (3L) - Terminal (P0)

[0093] Meanwhile, the resistance value between the terminal and the enclosure is also measured. This allows for the identification of potential leakage paths that could cause serious safety hazards, or accidental grounding of the power meter in the transformer unit while it is in operation. This helps prevent electric shock or fire.

[0094] In step (S70), it is checked whether the resistance value measured in step (S60) is less than a preset value. Here, the preset value may be, for example, 5 MΩ. If the measured resistance value is less than the preset value, it can be seen that a large amount of current has flowed into the power meter test device and a short circuit has occurred in the transformer-type power meter. That is, a short circuit may have occurred between terminals other than the P terminals, or between a terminal and the enclosure. Therefore, proceed to step (S80) to flash red in the second mode, and the abnormal terminal may be displayed on the LCD display along with the abnormal terminal from step (S50). For example, the second mode may be a high-speed red flash. That is, if red flashes at 1-second intervals in the first mode of step (S50), red flashes at 0.5-second intervals in the second mode of step (S80). Conversely, if the resistance value in step (S70) is greater than or equal to the preset value, proceed to step (S80) and light up the LED indicator in green.

[0095] Returning to step (S20) of FIG. 5, if the type of power meter is determined to be a 3-phase 4-wire standalone power meter, the processes on the right side of FIG. 5 are executed. That is, the power meter test method includes the steps of measuring the resistance value between terminals (S35), determining whether the resistance value is less than 30 kΩ (S45), if the resistance value is less than 30 kΩ, flashing the LED indicator red in the first mode and indicating the terminal as an abnormal terminal on the LCD display (S50), measuring the resistance value between the terminal and the enclosure if the resistance value is 30 kΩ or more (S65), determining whether the resistance value is less than 5 MΩ (S75), if the resistance value is less than 5 MΩ, flashing the LED indicator red in the second mode and indicating the terminal as an abnormal terminal on the LCD display (S80), and if the resistance value is 5 MΩ or more, lighting the LED indicator green (S90). Some steps of the test method for such a three-phase four-wire standalone power meter are identical to some steps of the test method for the aforementioned transformer-equipped power meter, so their detailed description is omitted, and the steps that are not identical are described below.

[0096] In step (S35) of FIG. 5, the resistance value between the terminals is measured. This is explained in detail through FIG. 13.

[0097] FIG. 13 schematically shows the internal circuit diagram of a three-phase four-wire standalone power meter. The internal circuit diagram of the three-phase four-wire standalone power meter in FIG. 13 is merely for illustrating the present invention and is not limited thereto. Accordingly, the internal circuit diagram of FIG. 13 can be modified differently.

[0098] As illustrated in FIG. 13, there are eight terminals (1S, 2S, 3S, 0S, 0L, 3L, 2L, 1L) inside the three-phase four-wire standalone power meter. The terminals (1S, 2S, 3S) are phase supply terminals; terminal (1S) is used for the first phase supply, terminal (2S) is used for the second phase supply, and terminal (3S) is used for the third phase supply. Terminal (0S) is a neutral supply terminal and is connected to the neutral wire. Terminal (0S) functions as a common return path for current in all three phases. The terminals (1L, 2L, 3L) function as output terminals connected to each phase load. Terminal (1L) is for the first phase load, terminal (2L) is for the second phase load, and terminal (3L) is for the third phase load. Terminal (0L) is a terminal corresponding to terminal (0S) and is connected to the neutral line connected to the load. Meanwhile, terminals (1S, 2S, 3S) and terminals (1L, 2L, 3L) are each interconnected. Through this, the supply and load terminals of each phase can be independently connected to the power meter, allowing the consumption of each phase to be accurately measured.

[0099] Returning to Fig. 5, in step (S35), the resistance values ​​between these terminals (1S, 2S, 3S, 0S, 0L, 3L, 2L, 1L) are measured. The combination of terminals for measuring resistance values ​​is as follows.

[0100] Terminal (1S) - Terminal (2S)

[0101] Terminal (1S) - Terminal (3S)

[0102] Terminal (1S) - Terminal (0S)

[0103] Terminal (1S) - Terminal (0L)

[0104] Terminal (1S) - Terminal (3L)

[0105] Terminal (1S) - Terminal (2L)

[0106] Terminal (2S) - Terminal (3S)

[0107] Terminal (2S) - Terminal (0S)

[0108] Terminal (2S) - Terminal (0L)

[0109] Terminal (2S) - Terminal (3L)

[0110] Terminal (2S) - Terminal (1L)

[0111] Terminal (3S) - Terminal (0S)

[0112] Terminal (3S) - Terminal (0L)

[0113] Terminal (3S) - Terminal (2L)

[0114] Terminal (3S) - Terminal (1L)

[0115] Terminal (0S) - Terminal (3L)

[0116] Terminal (0S) - Terminal (2L)

[0117] Terminal (0S) - Terminal (1L)

[0118] In step (S45), it is determined whether one or more of the measured resistance values ​​are less than a preset value. Here, the preset value may be, for example, 30 kΩ. If the resistance value is less than 30 kΩ, it can be considered that the closed circuit is short-circuited because the amount of current flowing through the power meter test device is high. Therefore, since it can be considered that damage has occurred between the terminals, in step (S50), the LED indicator may blink red in the first mode and the LCD display may indicate the terminal as abnormal. For example, the first mode may be a slow blinking of red. Conversely, if the resistance value is greater than or equal to the preset value, the process proceeds to step (S65) to measure the resistance value between the terminal and the enclosure.

[0119] In step (S75), it is checked whether the resistance value measured in step (S65) is less than a preset value. Here, the preset value may be, for example, 5 MΩ. If the measured resistance value is less than the preset value, it can be considered that there is leakage current. Therefore, proceed to step (S80) to flash the LED indicator red in the second mode, and display the fault terminal on the LCD display along with the fault terminal from step (S50). Conversely, if the resistance value in step (S75) is greater than or equal to the preset value, proceed to step (S80) to light the LED indicator green.

[0120] Although embodiments of the present disclosure have been described in detail above, the scope of the present disclosure is not limited thereto, and various modifications and improvements by those skilled in the art using the basic concepts of the present disclosure as defined in the following claims also fall within the scope of the present disclosure. Explanation of the symbols

[0121] 10. First switch section 20. Second switch section 30. Resistance section 40. Control unit 50. Measurement section 60. Fault Alarm Unit 601, 603. LED indicator 605. LCD display 70. Casing 701. Opening 703. Fixed wound 7031. Rotation limiting pieces 75. Power Supply 80. First terminal connection part 801. Connection Terminal 8011. Terminal section 8013. Rotating body part 8015. Protrusion 90. Second terminal connection part 100. Electricity meter test device PM. Electricity Meter

Claims

Claim 1 A power meter test device for automatically testing a power meter, wherein the power meter is any one of a three-phase four-wire standalone power meter comprising a 1S terminal, a 2S terminal, a 3S terminal, an OS terminal, a 1S terminal, an OL terminal, a 3L terminal, a 2L terminal, and a 1L terminal, and a transformer-type power meter comprising another 1S terminal, a P1 terminal, another 2S terminal, a P2 terminal, another 3S terminal, a P3 terminal, a P0 terminal, another 3L terminal, another 2L terminal, and another 1L terminal, and the power meter test device comprises a casing, and a first terminal protruding from the casing and formed corresponding to each of the terminals included in the transformer-type power meter, comprising another 1S connection terminal, a P1 connection terminal, a 2S connection terminal, a P2 connection terminal, a 3S connection terminal, a P3 connection terminal, a P0 connection terminal, a 3L connection terminal, a 2L connection terminal, and a 1L connection terminal. A connection portion; a second terminal connection portion comprising another 1S connection terminal, another 2S connection terminal, another 3S connection terminal, an 0S connection terminal, an 0L connection terminal, another 3L connection terminal, another 2L connection terminal, and another 1L connection terminal, which protrude from the casing and are formed corresponding to the terminals included in the three-phase four-wire standalone power meter; a first switch portion comprising a plurality of switches applied to be connected to the plurality of terminals of either the three-phase four-wire standalone power meter or the transformer power meter; a second switch portion comprising another plurality of switches connected in parallel with the plurality of switches; a resistor portion applied to form a closed circuit by being connected to each of the plurality of switches and each of the plurality of other switches; a control portion connected to each of the plurality of switches and each of the plurality of other switches; a measuring portion applied to measure a resistance value applied to the resistor portion, each connected to the resistor portion and the control portion; and when the resistance measured by the measuring portion is less than a preset value,It includes a fault alarm unit applied to indicate that there is a fault in either the 3-phase 4-wire standalone power meter and the transformer power meter forming a closed circuit with the resistor unit, wherein the first terminal connection unit and the second terminal connection unit protrude from the casing in mutually opposite directions, and the 2S connection terminal and the other 1L connection terminal, the P2 connection terminal and the other 2L connection terminal, the 3S connection terminal and the other 3L connection terminal, the P3 connection terminal and the 0L connection terminal, the P0 connection terminal and the 0S connection terminal, the 3L connection terminal and the other 3S connection terminal, the 2L connection terminal and the other 2S connection terminal, and the 1L connection terminal and the other 1S connection terminal are each positioned side by side along the said direction, and the fault alarm unit includes an LED indicator light, and when there is a fault, the LED indicator light flashes red, and one or more of the plurality of connection terminals included in the first terminal connection unit are formed in the casing A power meter testing device comprising: a terminal portion applied to protrude to the outside through an opening and connect to the terminals; and a rotating body portion connected to the terminal portion and fixed within the casing and applied to rotate. Claim 2 A power meter test device according to claim 1, wherein the connection terminal further includes a protrusion formed on the rotating body part, the rotating body part is fixed to a fixed ring formed inside the casing and rotates, a pair of rotation limiting pieces are formed within the fixed ring with the protrusion between them, and the protrusion is blocked by the pair of rotation limiting pieces to limit the rotation of the rotating body part.

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