JP2011253710A - Terminal block device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a terminal block device which can confirm a charge/failure state in an AC circuit without taking time and effort, does not cause anxiety about wrong operation by a measuring instrument, does not create a risk of short circuit or electric shock, and can also confirm the charge/failure state without erroneous recognition even when a current does not flow through a measuring section.SOLUTION: The terminal block device includes a terminal block 3 having power input terminals 4 (4u, 4v, 4w) and load connection terminals 5 (5u, 5v, 5w) connected at every phase of a three-phase AC circuit via a conductor 9. Between the power input terminals 4 and a grounded ground terminal 6, display lamps 7 between the terminal block and the ground are provided which are turned on when there is the potential difference between the terminal block and the ground, and between the load connection terminals 5, the display lamps 8 between phases are provided which are turned on when there is the potential difference between the phases.

Description

  The present invention relates to a terminal block device provided in a panel such as a control panel, and more particularly to a terminal block device for an AC circuit that integrates an indicator lamp that is turned on when there is a potential difference between ground and between phases.

  Patent Documents 1 and 2 described below are known as terminal block devices in which indicator lights are integrated. Among these, Patent Document 1 relates to a terminal block device with a charging indicator lamp, and an indicator lamp socket is connected between a plus terminal and a minus power circuit connected in parallel to an auxiliary relay to a plus power circuit. The charging state of the auxiliary relay circuit can be identified by the indicator lamp inserted in the lamp socket.

  Patent Document 2 relates to a terminal block structure. When a terminal block provided in a control panel for controlling an electric heater is operated by connecting the electric heater, the current flowing through the electric heater is detected and turned on. By installing the indicator lamp to be integrated, the current state can be monitored.

Japanese Utility Model Publication No. 5-88121 JP 2006-19173 A

By the way, in the AC circuit terminal block, it is necessary to confirm the presence or absence of the voltage between the ground and the phase using a voltage measuring instrument etc. when determining the charge / power failure of the electric wire, but it is determined that there are many terminals The work was very laborious and time consuming. Further, in the voltage measurement work, there is a possibility that an error occurs in the range setting of the measuring instrument, a short circuit accident due to the measurement lead wire, or an electric shock accident due to contact with the charged part.
Looking at the conventional known technology from this point of view, the terminal block device of Patent Document 1 (Japanese Utility Model Publication No. 5-88121) is for a DC circuit and cannot be used for AC as it is. The above-mentioned problems cannot be overcome. Patent Document 2 (Japanese Patent Application Laid-Open No. 2006-19173) also has a terminal block structure that detects the passage of current in an AC circuit. Since the configuration does not light up, it is not possible to properly determine the state of charge / power failure, and the above-mentioned problems cannot be overcome.

  The present invention has been made in view of such circumstances, and can check the charging / discharging state in an AC circuit without taking time, and can eliminate the fear of erroneous operation by a measuring instrument, short circuit, and electric shock. In addition, the main object is to provide a terminal block device capable of confirming a charge / power failure state without misunderstanding even when no current flows through the measurement site.

  In order to achieve the above object, a terminal block device according to the present invention comprises a terminal block having a power input terminal and a load connection terminal electrically connected via a conductor for each phase of a three-phase AC circuit. The terminal block is connected between the grounded ground terminal and each phase and is grounded when there is a potential difference between the ground (when there is a phase voltage) And a phase-indicating lamp that is turned on when there is a potential difference (when there is a line voltage).

  More specifically, a ground-to-ground indicator lamp is provided between each of one terminal of the power input terminal and the load connection terminal and the ground terminal, and a phase indicator lamp is provided between the power input terminal and the load. You may make it provide between each terminal of the other terminal with a connection terminal.

  Therefore, in the charged state, all of the ground-to-ground indicator lamp and the phase-to-phase indicator lamp are turned on if normal, and in the power failure state, all of the ground-to-ground indicator lamp and the inter-phase indicator lamp are turned off. As a result, it is possible to visually determine the state of charge / outage without using a measuring instrument.

  In addition, if the wire of any phase is disconnected on the upstream side (power side) from the power input terminal, power is not supplied to that phase even in the charged state, so the ground connected to that phase Since the inter-phase indicator lamp is turned off and the two inter-phase indicator lamps connected to the phase are extinguished, the three indicator lamps are extinguished simultaneously.

  For this reason, it is possible to grasp the disconnection of the cable on the power source side by confirming that some of the indicator lamps are turned off, and the circuit check becomes easy. At this time, if one of the phases is disconnected, the three indicator lamps are turned off at the same time. Therefore, a light-off pattern different from the light-off pattern due to a poor display lamp failure (a pattern in which the three indicator lights are turned off at the same time). ) Can be obtained, and can be distinguished from extinguishing due to defective indicator lamps.

  The interposition indicator lamp is arranged on the line connecting the power input terminal and the load connection terminal in the vicinity of the terminal of each phase to which it is connected, and the interphase indicator lamp is connected to the power input terminal and the load connection terminal. You may make it arrange | position in the position shifted from the line to connect. With such a configuration, it is possible to quickly identify a location having a defect.

Further, the power input terminal and the load connection terminal are configured to have a screw receiver that can be electrically connected to a front end portion of the male screw at a terminal portion of a screw hole into which the male screw is screwed. An inter-indicator lamp is connected between a screw receiver and a ground terminal provided on each of one terminal of the power input terminal and the load connecting terminal, and the interphase indicator lamp is connected to the power input terminal and the power input terminal. It is good to connect between the screw receiving provided in each of the other terminal with a load connection terminal.
By adopting such a configuration, since the male screw of the terminal is not firmly tightened and the indicator lamp is turned off when there is a looseness, it becomes possible to easily identify a contact failure due to the loosening of the male screw.

  The ground-to-ground indicator lamp and the interphase indicator lamp may emit light with different colors. With such a configuration, it is possible to recognize the lighting pattern (light-out pattern) without misunderstanding.

As described above, according to the terminal block device of the present invention, in each AC phase, there is provided a ground-to-ground indicator lamp that is connected between the ground terminal and each phase and lights when there is a potential difference between the ground. Because the phase indicator lamp that is connected between the phases and lights up when there is a potential difference between the phases is provided, even in the AC circuit, it is possible to instantly check the power failure status without trouble, and at the measurement site Even when no current is flowing, it is possible to confirm the charge / power failure state without misunderstanding. In addition, since a measuring instrument is not required to confirm the charge / power failure state, there is no worry of erroneous operation of the measuring instrument, and it is possible to eliminate short circuits and electric shock accidents. For this reason, it becomes possible to ensure efficiency and safety of the separation work or the like.
In addition, if a failure occurs in any of the phases, a light-off pattern different from that when the light is turned off due to an indicator light failure is obtained, so there is no risk of misidentification due to an indicator light failure and reliability can be improved. Become.

  In addition, the power input terminal and the load connection terminal are configured by having a screw receiver that can be electrically connected to the tip of the male screw at the end of the screw hole into which the male screw is screwed. Is connected between the screw receiver of one terminal of the power input terminal and the load connection terminal and the ground terminal, and the interphase indicator is connected to the screw of the other terminal of the power input terminal and the load connection terminal. Since the indicator lamp does not light up when the male screw of the terminal is not firmly tightened by connecting between the receptacles, it is possible to identify a connection failure due to loosening of the male screw.

  Furthermore, the interposition indicator lamp is arranged in proximity to the terminal of each phase to which it is connected on the line connecting the power input terminal and the load connection terminal, and the interphase indicator lamp is arranged on the power input terminal and the load connection terminal. By disposing at a position shifted from the line connecting the two, it is possible to quickly identify a location having a defect.

  Furthermore, by causing the ground-to-ground indicator lamp and the interphase indicator lamp to emit light in different colors, it is possible to grasp the lighting or extinguishing pattern without misidentification, and the current situation is easily grasped.

FIG. 1 is a diagram showing an example of a three-phase AC circuit provided with a terminal block device according to the present invention. 2A and 2B are diagrams showing a terminal block device according to the present invention, in which FIG. 2A is a plan view thereof, and FIG. 2B is a side view showing a charged state. FIG. 3 is a diagram showing a case where the terminal block device according to the present invention is in a power failure state. FIG. 4 is a diagram showing a state in the case where there is a disconnection of the power supply side V phase of the terminal block device according to the present invention or a loosening of the male screw of the V phase power input terminal. FIG. 5 is a diagram showing a state where the power supply side V-phase and W-phase are disconnected or the external thread of the power input terminal is loose in the terminal block device according to the present invention. FIG. 6 is a diagram illustrating a state where the ground wire of the terminal block device according to the present invention is broken or the ground wire is disconnected from the ground terminal.

  Embodiments of a terminal block device according to the present invention will be described below with reference to the accompanying drawings.

  In FIG. 1, a terminal block device 1 according to the present invention is provided on the secondary side of a three-phase transformer 2 of a three-phase AC circuit, and as shown in FIG. A power input terminal 4 (4u, 4v, 4w), a plurality of load connection terminals 5 (5u, 5v, 5w) arranged opposite to each other, and the power input terminal 4 and the load connection terminal 5 for each phase. It is configured to have an electric wire, a conductive plate 9 and the like that are connected inside the terminal block, and FIG. 2 shows only three phases and one circuit.

  Further, the terminal block 3 is provided with a ground terminal 6 installed through a ground wire 6a, and there is a potential difference between the power input terminals 4u, 4v, 4w of each phase and the ground terminal 6 between the ground. An earth-to-ground indicator lamp 7, which is an AC voltage specification LED or the like that is turned on in some cases, is disposed in a state in which a lighting portion is exposed from the terminal block 3. Further, the terminal block 3 is provided with an interphase indicator lamp 8 composed of an LED having an AC voltage specification connected between the phases of the load connection terminals 5u, 5v and 5w in a state where the lighting portion is exposed from the terminal block. Has been.

  In this example, each ground-to-ground indicator lamp 7 is positioned in front of the corresponding power input terminal 4u, 4v, 4w, that is, on the line connecting the power input terminal 4 and the load connection terminal 5 and close to the power input terminal 4. In addition, each phase indicator lamp 8 is shifted in the same direction from the front of the corresponding load connection terminals 5u, 5v, 5w, that is, from the line connecting the power input terminal 4 and the load connection terminal 5. The phase indicator lamps connected between adjacent load connection terminals are arranged at equidistant positions from the adjacent load connection terminals, and are arranged between the load connection terminals at both ends. The connected phase indicator lamp is disposed at a position shifted from the front of one load connection terminal to the side not interfering with the other phase indicator lamp).

  In this example, the ground indicator lamp 7 and the interphase indicator lamp 8 emit light in different colors. The ground indicator lamp 7 is, for example, orange, and the interphase indicator lamp 8 is For example, light is emitted in green.

  Each of the power input terminal 4 (4u, 4v, 4w) and the load connection terminal 5 (5u, 5v, 5w) is provided at the terminal portion of the screw hole into which the male screw 10 having conductivity and the male screw 10 are screwed. It is comprised from the screw | thread receiving 11 which has the electroconductivity which can be electrically connected with the front-end | tip part of the external thread 10.

  Each of the ground-to-ground indicator lamps 7 has one terminal connected to the ground terminal 6, the other terminal connected to the screw receiver 11 of the power input terminal 4, and each of the inter-phase indicator lights 8 One terminal is connected to the screw receiver 11 of the load connection terminal 5, the other terminal is connected to the screw receiver 11 of the other load connection terminal 5, and the male screw 10 is firmly screwed to the screw receiver 11. Only, the electric wires (the power supply line 12 and the load connection electric wire 13) attached to the terminals (the power input terminal 4 and the load connection terminal 5) are electrically connected to the screw receiver 11 via the male screw 10. (When not screwed firmly, the electric wire attached to the terminal is not electrically connected to the screw receiver 11 via the male screw 10).

  In the above configuration, the power supply line 12 of each phase is connected from the secondary side of the three-phase transformer 2 to the power input terminal 4 of the terminal block 3, and each phase on the load side is connected to the load connection terminal 5 of the terminal block 3. When the load connecting wire 13 is connected, the terminal is in a charged state, the male screw of each terminal is not loosened, and there is no disconnection between the secondary side of the three-phase transformer 2 and the terminal block 3. As shown in FIG. 2A, six indicator lights (three ground-to-ground indicator lights 7 and three interphase indicator lights 8) are lit and it can be visually confirmed that they are charged.

  Further, in the power failure state, as shown in FIG. 3, six indicator lights (three ground-to-ground indicator lights 7 and three interphase indicator lights 8) are turned off and all indicator lights 7 and 8 are turned off at the same time. Can only be considered when there is a power outage, so the state of power outage can be visually confirmed.

  Furthermore, between the secondary side of the three-phase transformer 2 and the terminal block 3, for example, when the V-phase is disconnected, or the male screw 10 of the V-phase power input terminal 4v is loosened, the male screw 10 and the screw receiver 4 is not electrically connected to the V-phase power input terminal 4u, as shown in FIG. 4, the V-phase ground indicator lamp 7 is extinguished, The interphase indicator lamp 8 connected between the U-V and V-W phases is also turned off. It is conceivable that the turn-off of the indicator light is caused by a failure of the indicator light, but the turn-off due to the failure of the indicator light is rare, and it is difficult to think that the three indicator lights turn off at the same time. When the lamp is extinguished, it can be seen that the corresponding phase of the ground-to-ground indicator lamp 7 is a broken wire or a loose male screw. On the contrary, when only one indicator lamp is turned off, it is possible to confirm that the indicator lamp is defective.

  As described above, since the one-phase disconnection of the power supply side or the looseness of the screws is recognized by simultaneously turning off the three indicator lamps, it can be distinguished from the extinction by the indicator lamp failure even by visual observation. It becomes possible, and it becomes possible to improve reliability.

  Furthermore, between the secondary side of the three-phase transformer 2 and the terminal block 3, for example, when the V phase and the W phase are disconnected or the male screw 10 of the power input terminals 4v and 4w is loose, FIG. As shown, since power is not supplied to the V-phase and W-phase power input terminals 4u and 4w, the V-phase and W-phase indicator lamps 7 are turned off, and U-V, V-W, W The -U phase indicator lamp 8 is also turned off. For this reason, only the U-phase ground-to-ground indicator lamp 7 is turned on (since five places are turned off at the same time), it is possible to visually recognize that the two phases are disconnected or the male screw 10 is loose. It becomes possible.

  When the ground wire 6a is disconnected or disconnected from the ground terminal 6, as shown in FIG. 6, all ground-to-ground indicators 7 are turned off, and U-V, V-W, W-U The phase indicator lamp 8 is turned on. For this reason, when such a lighting state is confirmed, it becomes possible to recognize that the ground wire 6a is disconnected or disconnected.

For this reason, it is possible to visually check the charge / power failure of the electric wires during inspection and patrol, so that voltage check by a measuring instrument is unnecessary, and the working time can be shortened. In addition, since it is not necessary to check the voltage with a measuring instrument, there is no erroneous operation with the measuring instrument, and it is possible to prevent a short circuit or an electric shock accident.
Furthermore, since it is possible to grasp the disconnection of the AC secondary circuit or the looseness of the male screw 10 by confirming the lighting pattern (light-off pattern), the circuit check can be easily performed.

  In the above configuration, the ground-to-ground indicator lamp 7 that is turned on when there is a potential difference between the power input terminal 4 (4u, 4v, 4w) and the ground terminal 6 is provided, and the load connection terminal 5u, 5v, 5w) An example of providing an interphase indicator lamp 8 that is turned on when there is a potential difference between the phases has been shown, but the ground indicator lamp 7 only needs to be able to confirm the presence or absence of a voltage between the ground terminal 6 and the phase, In addition, since the interphase indicator lamp 8 only needs to be able to confirm the presence or absence of the voltage between the phases, the inter-ground indicator lamp 7 is provided between the load connection terminal 5 (5u, 5v, 5w) and the ground terminal 6, and the interphase display Even if the lamp 8 is provided between the phases of the power input terminals, the same effect can be obtained.

DESCRIPTION OF SYMBOLS 1 Terminal block apparatus 3 Terminal blocks 4, 4u, 4v, 4w Power supply input terminal 5, 5u, 5v, 5w Load connection terminal 6 Ground terminal 7 Ground-to-ground indicator lamp 8 Interphase indicator lamp 9 Conductor 10 Male screw 11 Screw receiver

Claims (5)

  A terminal block having a power input terminal and a load connection terminal electrically connected via a conductor for each phase of the three-phase AC circuit is provided, and the terminal block is connected between the grounded ground terminal and each phase. A terminal block device comprising a ground-to-ground indicator lamp that is lit when there is a potential difference between grounds and a phase-indicator lamp that is connected between phases and is lit when there is a potential difference between phases.   The ground-to-ground indicator lamp is provided between each of the one terminal of the power input terminal and the load connection terminal and the ground terminal, and the phase-to-phase indicator lamp includes the power input terminal and the load connection terminal. The terminal block device according to claim 1, wherein the terminal block device is provided between each of the other terminals. The power input terminal and the load connection terminal are configured to have a male screw and a screw receiver that can be electrically connected to a distal end portion of the male screw at a terminal portion of a screw hole into which the male screw is screwed.
The ground-to-ground indicator lamp is connected between a screw receiver and a ground terminal provided on one of the terminals of the power input terminal and the load connection terminal, and the interphase indicator lamp is connected to the power input terminal. The terminal block device according to claim 2, wherein the terminal block device is connected between screw receivers provided on the other terminals of the load connection terminal and the load connection terminal.   The interposition indicator lamp is disposed on a line connecting the power input terminal and the load connection terminal in proximity to a terminal of each phase to which it is connected, and the interphase indicator lamp includes the power input terminal and the load. 4. The terminal block device according to claim 1, wherein the terminal block device is disposed at a position shifted from a line connecting the connection terminals. 5. The terminal block device according to any one of claims 1 to 4, wherein the ground-to-ground indicator lamp and the interphase indicator lamp emit light with different colors.

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