JP5579756B2 - Ground resistance measurement terminal board - Google Patents

Description

  The present invention relates to an improvement of a ground resistance measurement terminal board attached to a utility pole, a steel tower, etc., and in particular, eliminates the complexity of work when measuring a single or combined ground resistance of electrical equipment mounted on a utility pole or the like. The present invention relates to a ground resistance measurement terminal board capable of improving the efficiency of measurement work.

In order to prevent accidents due to electric leakage, grounding work is required by law for utility poles, steel towers, etc. equipped with electrical equipment such as transformers, lightning arresters, and high-voltage equipment. This grounding work is performed by embedding a grounding member to be a grounding electrode at a predetermined depth in the ground away from a power pole or the like and connecting a lead wire to the grounding electrode.
The connection between the conducting wire and the conducting wire connected to the electric device is made through a ground resistance measurement terminal board attached to a utility pole or the like. For example, as described in Patent Document 1, the ground resistance measurement terminal board includes a base that can be attached to a power pole and a lid that can be attached to and detached from the base, and connects a conductor from an electrical device to the base. A first terminal and a second terminal for connecting a conductive wire from a ground electrode are provided side by side, and both terminals are connected by a connectable connection tool.

Utility model registration No. 3168609

By the way, in order to keep the ground resistance below a specified value, the ground resistance is measured at regular intervals. When measuring the ground resistance, it is necessary to temporarily disconnect the electrical device and the ground electrode by temporarily removing the connection tool in order to accurately measure the ground resistance. In this state, the ground resistance of the conductive wire on the ground electrode side is measured.
In the ground resistance measurement terminal board described in Patent Document 1, the connection tool has a structure that is pressed and fixed to the terminal side with a screw. Therefore, in order to remove the connection tool, it is necessary to follow the procedure of removing the lid from the base, loosening the screw using a tool such as a screwdriver, and removing the connection tool, which is very complicated. Moreover, since the reverse procedure was followed for attachment of a connection tool, there existed a problem that work was inefficient.
The present invention has been made in view of the above circumstances, and provides a ground resistance measurement terminal board that eliminates the complexity of work when measuring ground resistance and can improve the efficiency of measurement work. For the purpose.

In order to solve the above problems, the invention according to claim 1 is a ground resistance measurement terminal board that is connected between a ground electrode and an electrical device and measures the ground resistance of the electrical device. A device-side terminal electrically connected to the electrical device, a ground-side terminal electrically connected to the grounding electrode, a base member in which the device-side terminal and the ground-side terminal are disposed, and the base member A cover member that is detachably assembled with respect to the device to cover or expose the device-side terminal and the ground-side terminal, and a device-side connecting / disconnecting piece provided on the device-side terminal, A ground-side connecting / disconnecting piece provided on the ground-side terminal, and the cover member is connected to the equipment-side connecting / disconnecting piece and the ground when the cover member is in a fully closed position where the cover member is completely attached to the base member. Electrically connected to the side connection piece A movable connecting / disconnecting piece that is electrically disconnected from the equipment-side connecting / disconnecting piece and the ground-side connecting / disconnecting piece when the cover member is in the fully open position separated from the base member. When the cover member is in an intermediate open position in the middle of the transition from the fully closed position to the fully open position, the contact piece is electrically connected to the ground side disconnect piece. And a part of the ground side terminal is exposed when the cover member is in the intermediate open position .

The invention according to claim 2 is a ground resistance measurement terminal board that is connected and arranged between a plurality of grounding electrodes and a plurality of electrical devices to measure the grounding resistance of each electrical device. A plurality of device-side terminals electrically connected to the device; a plurality of ground-side terminals electrically connected to the grounding electrodes; a base member on which the device-side terminals and the ground-side terminals are arranged; A cover member that is slidably attached to the base member in a slidable manner so as to conceal or expose the device-side terminals and the ground-side terminals. A plurality of equipment-side connecting / disconnecting pieces provided on the respective ground-side terminals, and a plurality of ground-side connecting / disconnecting pieces provided on the respective ground-side terminals, wherein the cover member is connected to the base member. When in the fully closed position When the cover member is in a state of being electrically connected to each of the ground-side connection pieces and the cover member is in a fully open position separated from the base member, each of the device-side connection pieces and each of the ground-side connection / disconnections. A movable connecting / disconnecting piece that is electrically disconnected from the piece, and the movable connecting / disconnecting piece is in an intermediate open position during the transition of the cover member from the fully closed position to the fully opened position. Maintain a state where the device side connecting / disconnecting piece and each grounding side connecting / disconnecting piece are electrically connected, and a part of each grounding side terminal is exposed when the cover member is in the intermediate open position. It is characterized by.
According to the first and second aspects of the present invention, the conduction state or non-conduction state between the equipment side connection / disconnection piece and the ground side connection / disconnection piece is switched by the movable connection / disconnection piece. The device-side connecting / disconnecting piece and the ground-side connecting / disconnecting piece are arranged on the base member, and the movable connecting / disconnecting piece is attached to a cover member that opens and closes the base member. By changing the position of the cover member with respect to the base member, the device Electrical connection / disconnection of the side connection / disconnection piece and the ground side connection / disconnection piece is performed.
In the case of shared grounding where the electrical equipment is grounded by a plurality of grounding electrodes, not only the grounding resistance of the grounding electrode alone but also the combined grounding resistance in a state where the plurality of grounding electrodes are electrically connected. It is necessary to measure. In the present invention, when the cover member is in the intermediate open state, the equipment side connecting / disconnecting piece and the grounding side connecting / disconnecting piece are electrically connected, and a part of the ground side terminal is exposed, so that the composite grounding can be easily performed. Resistance can be measured.

According to a third aspect of the present invention, in the first or second aspect, the movable connecting / disconnecting piece includes a projecting piece extending in a sliding direction of the cover member, and the equipment-side connecting / disconnecting piece and the ground-side connecting / disconnecting piece are The protruding piece is slidably held.
In the invention of claim 3, since the protruding piece is sandwiched between the equipment-side connecting piece and the ground-side connecting piece, the conduction between the movable connecting piece, the equipment-side connecting piece and the ground-side connecting piece is ensured. can do.
According to a fourth aspect of the present invention, in any one of the first to third aspects, the ground-side terminal includes a measurement terminal that is exposed when the cover member is in the intermediate open position. Features.
In the case of shared grounding where the electrical equipment is grounded by multiple grounding poles, measure not only the grounding resistance of the grounding pole alone but also the combined grounding resistance when multiple grounding poles are electrically connected. There is a need. In the invention of claim 4, when the measurement terminal is exposed with the cover member in an intermediate open state, and since the equipment side connecting / disconnecting piece and the grounding side connecting / disconnecting piece are electrically connected, the composite grounding can be easily performed. Resistance can be measured.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the base member includes a locking portion that fixes the cover member in each of a fully closed position and an intermediate open position, and the cover The member includes a locked portion that is locked to the locking portion.
In the invention of claim 5, when measuring the combined grounding resistance, the position of the cover member is fixed at the intermediate open position.
According to a sixth aspect of the present invention, in any one of the first to fifth aspects, the cover member is transparent.
According to the sixth aspect of the present invention, it is possible to perform the ground resistance measurement work while visually confirming the connection state of the device side connecting / disconnecting piece and the ground side connecting / disconnecting piece and the movable connecting / disconnecting piece.

  According to the present invention, the device-side connecting / disconnecting piece and the ground-side connecting / disconnecting piece are arranged on the base member, and the cover member is provided with the movable connecting / disconnecting piece that is electrically connected to or disconnected from each connecting piece. Without using a tool, etc., simply open and close the cover member to connect and disconnect the ground wire and equipment wire, eliminating the complexity of work when measuring ground resistance and improving the efficiency of the measurement work Is possible.

(A) (b) is a perspective view of the grounding resistance measurement terminal board which concerns on 1st embodiment of this invention. (A)-(c) is a top view which shows the relationship between the position of the cover member with respect to a base member, and the position of each connection piece. (A) is a figure explaining the measurement principle of a grounding resistance, (b) is a figure which shows the electric potential curve in each point. It is a schematic diagram which shows the structure at the time of installing the grounding resistance measurement terminal board of this invention in a utility pole. (A) (b) is the circuit block diagram which showed the outline for demonstrating the method to measure a grounding resistance using the grounding resistance measurement terminal board which concerns on 1st embodiment of this invention. (A)-(c) is the circuit block diagram which showed the outline for demonstrating the method to measure a grounding resistance using the grounding resistance measurement terminal board which concerns on 1st embodiment of this invention. It is a perspective view of a ground resistance measurement terminal board according to a modified embodiment of the present invention. (A)-(c) is a top view which shows the relationship between the position of the cover member with respect to a base member, and the position of each connection piece. It is a perspective view of the grounding resistance measurement terminal board which concerns on 2nd embodiment of this invention. (A)-(c) is a top view which shows the relationship between the position of the cover member with respect to a base member, and the position of each connection piece. (A) and (b) are the circuit block diagrams which showed the outline for demonstrating the method to measure a grounding resistance using the grounding resistance measurement terminal board which concerns on this embodiment.

[First embodiment]
A ground resistance measurement terminal board according to a first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a perspective view of a ground resistance measurement terminal board according to the present embodiment. The ground resistance measurement terminal board according to the present embodiment is characterized in that a connection piece for connecting and disconnecting an electric device and a ground electrode is attached to the cover member.

  The ground resistance measurement terminal board 1 is a terminal board for measuring the ground resistance of an electrical equipment connected between the grounding electrode and the electrical equipment, and the equipment-side terminal 30 electrically connected to the electrical equipment. A ground-side terminal 50 electrically connected to the grounding electrode, a base member 10 on which the device-side terminal 30 and the ground-side terminal 50 are disposed, and a base member 10 that is slidably and detachably assembled to the base member 10. A cover member 70 for concealing the side terminal 30 and the ground side terminal 50 in a concealed state (fully closed state) or an exposed state (fully open state), a device side connecting / disconnecting piece 37 provided on the device side terminal 30, and a ground side terminal 50, and the cover member 70 is connected to the equipment-side connection / disconnection piece 37 and the ground-side connection / disconnection when the cover member 70 is in the fully closed position where the cover member 70 is completely attached to the base member 10. Electrically connected simultaneously with piece 57 A movable connecting / disconnecting piece 80 that is electrically disconnected from the device-side connecting / disconnecting piece 37 and the ground-side connecting / disconnecting piece 57 when the cover member 70 is in the fully open position separated from the base member 10. The movable connecting / disconnecting piece 80 is in a state in which the device-side connecting / disconnecting piece 37 and the ground-side connecting / disconnecting piece 57 are electrically connected when the cover member 70 is in an intermediate open position on the way from the fully closed position to the fully open position. Is configured to maintain.

The base member 10 is made of an insulator, and the device-side terminal 30 and the ground-side terminal 50 are disposed on one surface (front surface).
The bottom plate 11 positioned at the lower end of the base member 10 protrudes to the surface side of the base member 10, and the equipment line insertion port 13 for inserting a conductive wire (hereinafter referred to as “equipment line”) from the electrical equipment into the bottom plate 11. In addition, a ground wire insertion port 15 for inserting a conductive wire (hereinafter referred to as “ground wire”) from the ground electrode is formed through.
Slide guides 17 that slidably guide the cover member 70 are formed on both side surfaces of the base member 10 so as to extend in the direction of arrow A in the figure. That is, the cover member 70 is guided by the slide guide 17 and slides in the direction of arrow A in the figure. Stoppers 19 (19 a, 19 b, 19 c) that maintain the cover member 70 in a fully closed state or an intermediate open state are formed to protrude at both ends and an intermediate portion in the longitudinal direction (vertical direction in the drawing) of the slide guide 17.
Further, the base member 10 is formed with a belt hole 21 through which a belt for fixing the base member 10 to a utility pole or the like passes through both side surfaces of the base member 10.

The device side terminal 30 includes a connection portion 31 that conducts the device line inserted from the device line insertion port 13 on the lower end side, and includes a device side connection piece 37 connected to the movable connection / disconnection piece 80 on the upper end side. Yes. In addition, the connection part 31 and the apparatus side connection / disconnection piece 37 are electrically connected by the conductor plate 43 attached to the base member 10 surface.
The connecting portion 31 is a part for electrically and mechanically fixing the device line, and includes a screw 33 screwed to the base member 10 and a pressing plate 35 pressed against the conductor plate 43 by the screw 33. . The device line inserted from below the device line insertion port 13 toward the surface of the base member 10 is held between the conductor plate 43 and the pressing plate 35 and fixed by screws 33.
The apparatus-side connecting / disconnecting piece 37 has two conductor pieces 39 arranged to face each other and project from the conductor plate 43 in a direction intersecting the surface of the base member 10. Between the two conductor pieces 39, a holding recess 41 (clamping portion) for holding the movable connecting / disconnecting piece 80 is formed and extends in the direction of arrow A (sliding direction of the cover member 70) in the figure. By sandwiching the movable connecting / disconnecting piece 80 between the two conductor pieces 39, conduction between the device-side connecting / disconnecting piece 37 and the movable connecting / disconnecting piece 80 is ensured.

Since the ground-side terminal 50 has substantially the same configuration as the device-side terminal 30, only the outline and differences will be described. The ground side terminal 50 includes a connection portion 51 that conducts the ground wire inserted from the ground wire insertion port 15 on the lower end side, and a ground side connection / disconnection piece 57 connected to the movable connection / disconnection piece 80 on the upper end side. Yes. The connecting part 51 includes a screw 53 and a pressing plate 55. The ground-side connecting / disconnecting piece 57 has two conductor pieces 59 that form a holding recess 61 (clamping portion). Further, the connecting portion 51 and the ground side connecting / disconnecting piece 57 are electrically connected by a conductor plate 63. By sandwiching the movable connecting / disconnecting piece 80 between the two conductor pieces 59, electrical connection between the device-side connecting / disconnecting piece 57 and the movable connecting / disconnecting piece 80 is ensured.
Unlike the device-side terminal 30, the ground-side terminal 50 has a measurement terminal 65 extending from the lower end of the conductor plate 63 toward the lower end of the base member 10 (see FIG. 2).

The cover member 70 is an insulator that covers the surface of the base member 10, and has a fitting recess 71 that fits with the slide guide 17 of the base member 10 on the inner surface thereof. The fitting recess 71 is a recess extending in the sliding direction of the cover member 70 (in the direction of arrow A in the figure). Locked portions 73 (73a, 73b, 73c) that are locked to the stopper 19 are formed to protrude at appropriate positions in the middle portion of the fitting recess 71. Note that the locked portion 73 is locked to the stopper 19 so as to prevent the cover member 70 from sliding when the fully closed state and the intermediate open state where the measurement terminal 65 is exposed.
When a force in the direction of arrow A is applied to the cover member 70 in a state where the locked portion 73 is locked to the stopper 19, the locked portion 73 gets over the stopper 19, and the cover member 70 is slid. be able to. Further, when the locked portion 73a gets over the stopper 19c in the process of moving the cover member 70 in the opening direction, the cover member 70 can be completely removed from the base member 10.
In addition, the cover member 70 can visually recognize the electrical continuity state between the device side connecting / disconnecting piece 37 and the ground side connecting / disconnecting piece 57 and the movable connecting / disconnecting piece 80 in a state where the base member 10 is concealed or opened in the middle. Thus, it is desirable to use an acrylic transparent cover.

  The movable connecting / disconnecting piece 80 is fixed to the inner surface side of the cover member 70 (the surface facing the surface of the base member 10). The movable connecting / disconnecting piece 80 includes two protruding pieces 81 (protruding portions) that protrude toward the surface of the base member and extend in the sliding direction of the cover member 70 when the cover member 70 is attached to the base member 10. ing. The two protruding pieces 81 are electrically and mechanically connected by a connecting piece 83.

Here, the relationship between the ground-side connecting / disconnecting piece 57 and the device-side connecting / disconnecting piece 37 and the movable connecting / disconnecting piece 80 will be described with reference to FIG. FIG. 2 is a plan view showing the relationship between the position of the cover member relative to the base member and the position of each connecting / disconnecting piece.
(A) is a state in which the cover member 70 is fully closed, that is, the cover member 70 completely covers the surface of the base member 10, and all of the device side terminal 30 and the ground side terminal 50 are completely hidden by the cover member 70. It is in a state. Each protruding piece 81 of the movable connecting / disconnecting piece 80 is sandwiched between the two conductor pieces 39 of the device-side connecting / disconnecting piece 37 and the two conductor pieces 59 of the ground-side connecting / disconnecting piece 57. Is a state where it is electrically connected to both the device-side connecting / disconnecting piece 37 and the ground-side connecting / disconnecting piece 57 simultaneously.
(B) shows an intermediate open state in which the measurement terminal 65 is exposed by sliding the cover member 70 from the state of (a). At this time, each projecting piece 81 of the movable connecting / disconnecting piece 80 is sandwiched between the two conductor pieces 39 of the device side connecting / disconnecting piece 37 and the two conductor pieces 59 of the ground side connecting / disconnecting piece 57, respectively. The contact piece 80 is maintained in a state where it is electrically connected to both the device-side connection / disconnection piece 37 and the ground-side connection / disconnection piece 57 simultaneously.
(C) has shown the fully open state which removed the cover member 70 from the state of (b). At this time, each protruding piece 81 of the movable connecting / disconnecting piece 80 is separated from the two conductor pieces 39 of the device-side connecting / disconnecting piece 37 and the two conductor pieces 59 of the ground-side connecting / disconnecting piece 57. Reference numeral 80 denotes a state in which the apparatus side connecting / disconnecting piece 37 and the ground side connecting / disconnecting piece 57 are not electrically connected. Note that the cover member 70 may be attached to the base member 10 as long as the movable connection / disconnection piece 80 is separated from the ground-side connection / disconnection piece 57 and the device-side connection / disconnection piece 37 and is in a non-conductive state.

  Next, before explaining how to use the ground resistance measurement terminal board according to the present invention, a general ground resistance measurement method will be described with reference to FIG. FIG. 3A is a diagram for explaining the measurement principle of the ground resistance. FIG. 3B shows a potential curve at each point. In order to measure the ground resistance, as shown in FIG. 3A, the auxiliary electrode P3 is separated from the ground electrode P1 by 10 m or more and buried in the ground. Then, an oscillator 201 is connected between the ground electrode P1 and the auxiliary electrode P3, and an ammeter 202 is inserted in series. Further, a voltmeter 203 is connected between the ground electrode P1 and the auxiliary electrode P2. In this state, a voltage V0 having a predetermined frequency is output from the oscillator 201. When the auxiliary electrode P2 is buried between P1 and P3, a portion where the potential is flat is generated (see FIG. 3B). A voltmeter 203 is inserted between P1 and P2, and the flat voltage is measured. When the voltage at that time is V1, and the current of the ammeter 202 is I, the ground resistance R1 of the ground electrode P1 is obtained by R1 = V1 / I (Ω) (see the Encyclopedia of Electricity, edited by Ohm).

  FIG. 4 is a schematic diagram showing the configuration when the ground resistance measurement terminal board of the present invention is installed on a utility pole. The ground resistance measurement terminal board 1 is wound and fixed by a metal belt 205 at a predetermined height position of the utility pole 204. Also connected from the ground resistance measurement terminal board 1 are a device wire 206 connected to an electrical device (transformer, lightning arrester, high voltage device, etc.) to be grounded (not shown) and a conductive wire (ground wire 207) embedded in the utility pole 204. The ground wire 207 is connected to a conductor 210 connected to a ground electrode 209 embedded in the ground 208. 4 shows an example (single grounding) in which one electric device is grounded by a single grounding electrode 209 with respect to the utility pole 204.

5 and 6 are circuit configuration diagrams schematically illustrating a method for measuring the ground resistance using the ground resistance measurement terminal board according to the present embodiment. In addition, the same number is attached | subjected and demonstrated to the same structure as the above-mentioned structure.
As shown in FIG. 5, in the case of single grounding, one electric device A is connected to the grounding electrode 209 via the grounding resistance measurement terminal board 1. That is, the device A is electrically connected to the ground resistance measurement terminal board 1 by the device line 206, and the ground electrode 209 is electrically connected to the ground resistance measurement terminal board 1 by the ground wire 207.
In the fully closed state of the cover member 70 shown in FIG. 2A, the device side terminal 30 and the ground side terminal 50 and the movable connecting / disconnecting piece 80 are electrically connected to each other, and the device A is grounded. (The circuit configuration shown in FIG. 5A).
When measuring the ground resistance, as shown in FIG. 2C, the cover member 70 is fully opened, and the movable connecting / disconnecting piece 80 is separated from the device side terminal 30 and the ground side terminal 50. The circuit configuration at this time is as shown in FIG. Then, by connecting a measurement device (not shown) to the measurement terminal 65 and measuring, the ground resistance of the ground A can be accurately measured.

As shown in FIG. 6, in the case of common grounding, the electric equipment A and the electric equipment B are grounded via the ground resistance measurement terminal boards 1a and 1b, respectively. That is, the device A is electrically connected to the ground resistance measurement terminal board 1a through the device line 206a, and the ground electrode 209a is electrically connected to the ground resistance measurement terminal board 1a through the ground wire 207a. Device B is also grounded in the same manner as device A. Further, the device line 206a and the device line 206b are connected by an aerial joint ground line 211.
When the cover member 70 of each ground resistance measurement terminal board 1 is in the fully closed state shown in FIG. 2A, the equipment side terminal 30 and the ground side terminal 50 of each ground resistance measurement terminal board 1 and the movable connecting / disconnecting piece 80. Are electrically connected to each other and the device A and the device B are grounded (circuit configuration shown in FIG. 6A).

When measuring the combined ground resistance of the ground A and the ground B, the cover member 70 of the ground resistance measurement terminal board 1a connected to one of the devices A is in an intermediate open state to expose the measurement terminal 65a (FIG. 2B). reference). The circuit configuration at this time remains as shown in FIG. Then, by connecting a measuring instrument (not shown) to the measuring terminal 65a, the combined ground resistance can be measured.
Subsequently, when measuring the single ground resistance of the ground A, the cover member 70 of the ground resistance measurement terminal board 1a is fully opened, and the movable connecting / disconnecting piece 80a is separated from the device side terminal 30 and the ground side terminal 50a (FIG. 2). (See (c)). The circuit configuration at this time is as shown in FIG. Then, by connecting a measuring instrument (not shown) to the measurement terminal 65a, it is possible to accurately measure the ground resistance of the ground A alone.
Similarly, if the cover member 70 of the ground resistance measurement terminal board 1b is fully opened and the measuring instrument is connected to the measurement terminal 65b, the ground resistance of the ground B alone can be measured (the circuit configuration of FIG. 6C). ).

  As described above, according to the present embodiment, the device-side connecting / disconnecting piece and the ground-side connecting / disconnecting piece are arranged on the base member, and the movable connecting / disconnecting piece that is electrically connected to or disconnected from each connecting piece is covered with the cover member. Therefore, without using a tool such as a screwdriver, just opening and closing the cover member exposes the terminals (or conductors) required for ground resistance measurement, and connects and disconnects the ground wire and equipment wire. Therefore, it is possible to eliminate the complexity of the work when measuring the ground resistance and to improve the efficiency of the measurement work.

[Modified Embodiment]
A ground resistance measurement terminal board according to a modified embodiment of the present invention will be described with reference to FIG. FIG. 7 is a perspective view of a ground resistance measurement terminal board according to a modified embodiment of the present invention. In the ground resistance measurement terminal board according to the present embodiment, the shape of the connecting / disconnecting piece is different from that of the first embodiment. The same members as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
The device-side connecting / disconnecting piece 90 of the ground resistance measuring terminal board 2 is disposed on the upper end side of the base member 10, and sandwiches the movable connecting / disconnecting piece 110 with the conductor plate 43, and a sandwiching piece 91. The pressing piece 91 is inserted into the conductor plate 43 by inserting the pressing piece 91 into the base member 10 and the shaft of the screw 93 positioned between the head of the screw 93 and the pressing piece 91. And an elastically biased spring 95. The movable connecting / disconnecting piece 110 is held between the conductor plate 43 and the pressing piece 91. Thus, since the movable connection / disconnection piece 110 is pinched | interposed by the conductor plate 43 and the pinching piece 91, conduction | electrical_connection with the apparatus side connection / disconnection piece 90 and the movable connection / disconnection piece 110 can be ensured. Note that the upper end portion 91 a of the pinching piece 91 is curved in a direction away from the surface of the base member 10, thereby facilitating introduction of the movable connecting / disconnecting piece 110 between the conductor plate 43 and the pinching piece 91.
The ground-side connecting / disconnecting piece 100 has the same configuration as the device-side connecting / disconnecting piece 90, and includes a pinching piece 101, a screw 103, and a spring 105.

  The movable connecting / disconnecting piece 110 includes two protruding pieces 111 that are electrically connected to the device-side connecting / disconnecting piece 90 and the ground-side connecting / disconnecting piece 100, respectively. Each protruding piece 111 is a conductor extending in the sliding direction (arrow A direction) of the cover member 70, and has a recess 113 at the intermediate portion in the width direction. The shaft portion of the screw 93 or the screw 103 passes through the recess 113 in the process of connecting to the ground-side connecting / disconnecting piece 100 or the device-side connecting / disconnecting piece 90. The two projecting pieces 111 are electrically and mechanically connected by a connecting piece 115.

Here, the relationship between the ground-side connecting / disconnecting piece 100 and the equipment-side connecting / disconnecting piece 90 and the movable connecting / disconnecting piece 110 is shown in FIG. FIG. 8 is a plan view showing the relationship between the position of the cover member relative to the base member and the position of each connecting / disconnecting piece. (A) shows a fully closed state of the cover member 70, (b) shows an intermediate open state in which the measurement terminal 65 is exposed, and (c) shows a fully open state. As shown in the drawing, the position of the cover member 70 with respect to the base member 10 and the electrical connection relationship are the same as those in the first embodiment, and FIGS. 8A to 8C are respectively the same as FIGS. Since it corresponds to c), detailed description is omitted.
Since the method of use is the same as in the first embodiment, the description thereof will be omitted. In this modified embodiment, the same effect as that of the first embodiment can be obtained.

[Second Embodiment]
A ground resistance measurement terminal board according to a second embodiment of the present invention will be described with reference to FIG. FIG. 9 is a perspective view of a ground resistance measurement terminal board according to the second embodiment of the present invention. The ground resistance measurement terminal board according to the present embodiment is characterized in that a connection piece for connecting and disconnecting a plurality of electrical devices and a plurality of ground electrodes is attached to the cover member. Hereinafter, the same reference numerals are given to the same members as those in the first embodiment, and the description thereof is omitted.

The ground resistance measurement terminal board 3 is a terminal board that is connected and arranged between a plurality of grounding electrodes and a plurality of electrical devices, and is used to measure the ground resistance of each electrical device, and is electrically connected to the two electrical devices. The two equipment-side terminals 30 (30a, 30b), the two ground-side terminals 50 (50a, 50b) electrically connected to the two grounding electrodes, the equipment-side terminal 30 and the ground-side terminal 50 are arranged. A base member 10, and a cover member 70 that is slidably attached to the base member 10 in a slidable manner to hide or expose the device-side terminal 30 and the ground-side terminal 50. Two device-side connecting / disconnecting pieces 37 (37a, 37a) provided in each of the side terminals 30, and two ground-side connecting / disconnecting pieces 57 (57a, 57b) provided in each of the ground-side terminals 50, The cover member 70 includes When the bar member 70 is in the fully closed position fully attached to the base member 10, it is in a state of being electrically connected to each device-side connecting / disconnecting piece 37 and each grounding-side connecting / disconnecting piece 57, and the cover member 70 is connected to the base member 10. The movable connecting / disconnecting piece 120 which is electrically disconnected from each device-side connecting / disconnecting piece 37 and each grounding-side connecting / disconnecting piece 57 when in the fully open position separated from the movable connecting / disconnecting piece 120 is provided with the cover member 70. Is in an intermediate open position on the way from the fully closed position to the fully open position, and is configured to maintain the state in which each device side connecting / disconnecting piece 37 and each ground side connecting / disconnecting piece 57 are electrically connected. Yes.
In the following description, when a set of members having the same configuration (for example, the device-side terminal 30a and the device-side terminal 30b) is not particularly distinguished, the alphabet in the reference numerals is omitted (“device-side terminal 30”). ")".

  Both end portions in the width direction of the upper surface plate 23 positioned at the upper end portion of the base member 10 protrude to the surface side of the base member 10, and device line insertion openings 13 (13a, 13a, 13b) is formed through. The intermediate portion in the width direction of the upper surface plate 23 serves as a passage path for the movable connecting / disconnecting piece 120. The bottom plate 11 positioned at the lower end of the base member 10 is formed with through-holes 15 (15a, 15b) through which the ground lines from the two ground poles are inserted.

The device side terminal 30 is disposed on the upper end side of the base member 10. Each device-side terminal 30 is disposed at both ends in the width direction of the base member 10, and is connected to the connection portion 31 that conducts the device line inserted from the device line insertion port 13 and the movable connecting / disconnecting piece 120. The apparatus side connecting / disconnecting piece 37 is provided. The connecting portion 31 and the device side connecting / disconnecting piece 37 are electrically connected by a conductor plate 43.
FIG. 9 shows an example of the positional relationship between each connecting portion 31 and each device-side connecting / disconnecting piece 37 in the width direction of the base member 10, and the arrangement location (installation position) is arbitrarily determined. Can do.

The ground side terminal 50 is disposed on the lower end side of the base member 10. Each ground-side terminal 50 is disposed at both ends in the width direction of the base member 10, and is connected to the connection portion 51 that conducts the ground wire inserted from the ground wire insertion port 15 and the movable connecting / disconnecting piece 120. The grounding side connecting / disconnecting piece 57 is provided. The connecting portion 51 and the ground side connecting / disconnecting piece 57 are electrically connected by a conductor plate 63.
The ground-side connecting / disconnecting piece 57 is disposed at a position that is in series with the device-side connecting / disconnecting piece 37 in the sliding direction of the cover member 70 (arrow A direction). That is, the device-side connecting / disconnecting piece 37a and the ground-side connecting / disconnecting piece 57a, and the device-side connecting / disconnecting piece 37b and the ground-side connecting / disconnecting piece 57b are arranged in series in the sliding direction of the cover member 70, respectively. 41 and 61 are arranged on a straight line.
Note that the measurement terminal 65 extends from the lower end of each conductor plate 63 toward the lower end of the base member 10 (see FIG. 10).

Since the main structure of the cover member 70 is the same as that of the first embodiment, the description thereof is omitted.
Similarly to the movable connecting / disconnecting piece 80 in the first embodiment, the movable connecting / disconnecting piece 120 faces the surface of the base member 10 when the cover member 70 is attached to the base member 10. Two projecting pieces 121 (121a, 121b: projecting portions) that project in the sliding direction of the cover member 70 are provided. The two protruding pieces 121 are electrically and mechanically connected by a connecting piece 123.

Here, the relationship between the ground side connection / disconnection piece 57 and the device side connection / disconnection piece 37 and the movable connection / disconnection piece 120 will be described with reference to FIG. FIG. 10 is a plan view showing the relationship between the position of the cover member relative to the base member and the position of each connecting / disconnecting piece.
(A) is a state in which the cover member 70 is fully closed, that is, the cover member 70 completely covers the surface of the base member 10, and all of the device side terminal 30 and the ground side terminal 50 are completely hidden by the cover member 70. It is in a state. The protruding piece 121a of the movable connecting / disconnecting piece 120 is sandwiched between two conductor pieces 39a of the device-side connecting / disconnecting piece 37a and two conductor pieces 59a of the ground-side connecting / disconnecting piece 57a. The protruding piece 121b of the movable connecting / disconnecting piece 120 is sandwiched between the two conductor pieces 39b of the device-side connecting / disconnecting piece 37b and the two conductor pieces 59b of the ground-side connecting / disconnecting piece 57b. That is, the movable connecting / disconnecting piece 120 is electrically connected to both the device-side connecting / disconnecting pieces 37 and the grounding-side connecting / disconnecting pieces 57 simultaneously.
(B) has shown the intermediate | middle open state which moved the cover member 70 from the state of (a), and exposed the measurement terminals 65a and 65b. At this time, the two protruding pieces 121 of the movable connecting / disconnecting piece 120 are sandwiched between the conductor piece 39 of each device-side connecting / disconnecting piece 37 and the conductor piece 59 of each ground-side connecting / disconnecting piece 57, respectively. The piece 120 is maintained in a state where it is electrically connected to both the device-side connecting / disconnecting pieces 37 and the ground-side connecting / disconnecting pieces 57 simultaneously.
(C) has shown the fully open state which removed the cover member 70 from the state of (b). At this time, the protruding piece 121a of the movable connecting / disconnecting piece 120 is separated from the device-side connecting / disconnecting piece 37a and the ground-side connecting / disconnecting piece 57a. Further, the protruding piece 121b of the movable connecting / disconnecting piece 120 is separated from the device-side connecting / disconnecting piece 37b and the ground-side connecting / disconnecting piece 57b. Therefore, the movable connecting / disconnecting piece 120 is electrically disconnected from the device-side connecting / disconnecting piece 37 and the ground-side connecting / disconnecting piece 57. The cover member 70 may be attached to the base member 10 as long as the movable connection / disconnection piece 120 is separated from the device-side connection / disconnection piece 37 and the ground-side connection / disconnection piece 57 and is in a non-conductive state.

FIG. 11 is a circuit configuration diagram schematically illustrating a method for measuring the ground resistance using the ground resistance measurement terminal board according to the present embodiment. In addition, the same number is attached | subjected and demonstrated to the same structure as the above-mentioned structure.
In the ground resistance measurement terminal board 3 according to the present embodiment, the electric equipment A and the electric equipment B are commonly grounded to the ground A and the ground B through the ground resistance measurement terminal board 3, respectively. That is, the device A is electrically connected to the ground resistance measurement terminal board 3 by the device line 206a and the device B is connected by the device line 206b. The ground electrode 209a is electrically connected to the ground resistance measurement terminal board 3 via the ground wire 207a, and the ground electrode 209b is electrically connected to the ground resistance measurement terminal board 3.
When the cover member 70 of the ground resistance measurement terminal board 3 is in the fully closed state shown in FIG. 10A, the device side terminal 30a and the ground side terminal 50a, the device side terminal 30b and the ground side terminal 50b, and the device side terminal 30a. And the device side terminal 30b are electrically connected to the movable connecting / disconnecting piece 120, and the device A and the device B are grounded (circuit configuration shown in FIG. 11A).

When measuring the combined ground resistance of the ground A and the ground B, as shown in FIG. 10B, the cover member 70 of the ground resistance measurement terminal board 3 is opened in the middle, and the measurement terminals 65a and 65b are exposed. The circuit configuration at this time remains as shown in FIG. Then, by connecting a measuring instrument (not shown) to either the measurement terminal 65a or the measurement terminal 65b, the combined ground resistance of the ground A and the ground B can be measured.
Subsequently, when measuring the single ground resistance of the ground A and the ground B, the cover member 70 of the ground resistance measurement terminal board 3 is fully opened, and the movable connecting / disconnecting piece 120 is separated from the ground side terminals 50a and 50b. Let The circuit configuration at this time is as shown in FIG. If a measuring instrument (not shown) is connected to the measurement terminal 65a, the ground resistance of the ground A can be accurately measured. If the measuring instrument is connected to the measuring terminal 65b, the ground resistance of the ground B can be measured accurately.

As described above, according to the present embodiment, the terminal (or conductor) necessary for measuring the ground resistance is exposed by opening and closing the cover member without using a tool such as a screwdriver. Since the connection and disconnection of the wire is performed, it is possible to eliminate the complexity of the work when measuring the ground resistance and to improve the efficiency of the measurement work.
In addition, it cannot be overemphasized that it is good also as a structure which clamps a movable connection / disconnection piece between conductor plates like modified embodiment. In the present embodiment, the ground resistance measurement terminal board having two device side terminals and two ground side terminals has been described. However, there may be three or more device side terminals and ground side terminals.

  1, 2 and 3 ... Ground resistance measurement terminal board, 10 ... Base member, 11 ... Bottom plate, 13 ... Equipment wire insertion port, 15 ... Ground wire insertion port, 17 ... Slide guide, 19 ... Stopper, 21 ... Belt hole, 23 DESCRIPTION OF SYMBOLS ... Upper surface plate, 30 ... Equipment side terminal, 31 ... Connection part, 33 ... Screw, 35 ... Pressing plate, 37 ... Equipment side connection / disconnection piece, 39 ... Conductor piece, 41 ... Recess for clamping, 43 ... Conductor plate, 50 DESCRIPTION OF SYMBOLS ... Ground side terminal, 51 ... Connection part, 53 ... Screw, 55 ... Pressing plate, 57 ... Ground side connecting / disconnecting piece, 59 ... Conductor piece, 61 ... Recess for clamping, 63 ... Conductor plate, 65 ... Measurement terminal, 70 DESCRIPTION OF SYMBOLS ... Cover member, 71 ... Fitting recess, 73 ... Locked part, 80 ... Movable connecting / disconnecting piece, 81 ... Protruding piece, 83 ... Connecting piece, 90 ... Equipment side connecting / disconnecting piece, 91 ... Clamping piece, 93 ... Screw, 95 ... Spring, 100 ... Contact / disconnection piece, 101 ... Pressing piece, 103 ... Screw, 105 ... Spring, DESCRIPTION OF SYMBOLS 10 ... Movable connecting / disconnecting piece, 111 ... Protruding piece, 113 ... Recessed part, 115 ... Connecting piece, 120 ... Moving connecting / disconnecting piece, 121 ... Protruding piece, 123 ... Connecting piece, 201 ... Oscillator, 202 ... Ammeter, 203 ... Voltage 204: Electric pole, 205 ... Metal belt, 206 ... Equipment wire, 207 ... Ground wire, 208 ... Ground, 209 ... Ground electrode, 210 ... Conductor, 211 ... Overhead common ground wire

Claims (6)

A ground resistance measurement terminal board for measuring the ground resistance of the electrical equipment connected between the ground electrode and the electrical equipment,
A device-side terminal electrically connected to the electrical device;
A ground side terminal electrically connected to the ground electrode;
A base member in which the device side terminal and the ground side terminal are arranged;
A cover member that is slidably attached to the base member in a slidable manner so that the device side terminal and the ground side terminal are concealed or exposed;
A device-side connecting / disconnecting piece provided on the device-side terminal;
A ground-side connecting / disconnecting piece provided on the ground-side terminal,
The cover member is in a state of being electrically connected to the device-side connecting / disconnecting piece and the ground-side connecting / disconnecting piece when the cover member is in a fully closed position fully attached to the base member. A movable connecting / disconnecting piece that is electrically disconnected from the equipment-side connecting / disconnecting piece and the ground-side connecting / disconnecting piece when in the fully open position separated from the base member;
The movable connecting / disconnecting piece electrically connects the device-side connecting / disconnecting piece and the grounding-side connecting / disconnecting piece when the cover member is in an intermediate open position on the way from the fully closed position to the fully open position. to maintain the state,
A part of the ground side terminal is exposed when the cover member is in the intermediate open position . A ground resistance measurement terminal board that is connected between a plurality of grounding electrodes and a plurality of electrical devices to measure the grounding resistance of each electrical device,
A plurality of device-side terminals electrically connected to each of the electrical devices;
A plurality of ground-side terminals electrically connected to each grounding electrode;
A base member in which each device-side terminal and each ground-side terminal are arranged, and is slidably attached to the base member in a slidable manner, and each device-side terminal and each ground-side terminal are concealed, or A cover member to be exposed,
A plurality of device side connecting / disconnecting pieces provided on each of the device side terminals,
A plurality of ground-side connecting / disconnecting pieces provided on each of the ground-side terminals,
The cover member is in a state of being electrically connected to each device side connecting / disconnecting piece and each grounding side connecting / disconnecting piece when the cover member is in a fully closed position fully attached to the base member. When the member is in the fully open position separated from the base member, the device includes a movable connecting / disconnecting piece that is electrically disconnected from each device-side connecting / disconnecting piece and each grounding-side connecting / disconnecting piece,
The movable connecting / disconnecting piece electrically connects each device-side connecting / disconnecting piece and each grounding-side connecting / disconnecting piece when the cover member is in an intermediate open position on the way from the fully closed position to the fully open position. maintaining the state of being connected to,
A part of each of the ground side terminals is exposed when the cover member is in the intermediate open position .   2. The movable connecting / disconnecting piece includes a protruding piece extending in a sliding direction of the cover member, and the apparatus-side connecting / disconnecting piece and the ground-side connecting / disconnecting piece slidably hold the protruding piece. Or the ground resistance measurement terminal board of 2.   4. The ground resistance measurement terminal board according to claim 1, wherein the ground side terminal includes a measurement terminal that is exposed when the cover member is in the intermediate open position. 5. .   The base member includes a locking portion that fixes the cover member to each of a fully closed position and an intermediate open position, and the cover member includes a locked portion that is locked to the locking portion. The grounding resistance measurement terminal board according to any one of claims 1 to 4, wherein the grounding resistance measurement terminal board is provided.   The ground resistance measurement terminal board according to any one of claims 1 to 5, wherein the cover member is transparent.

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