JP6488344B1 - Leak current meter - Google Patents

Abstract

Leakage current measurement work can be performed easily and in a short time, an off-the-shelf leakage ammeter can be used, a leakage current of a lead-in wire at a high place can be easily measured, a clamp portion The lead-in wire should be able to be inserted into the clamp part even when is closed. A leakage ammeter having clamp portions 3 and 4 at the upper end of a main body portion, a follower portion 12 that can be attached to the clamp portion 3, a housing 5 that can be attached to the lower end side of the main body portion, and a housing 5 Sliding part 9 that can slide within a predetermined range in the vertical direction, elastic member 10 that urges sliding part 9 downward, and clamped driven part 12 in conjunction with sliding upward of sliding part 9 Leakage ammeter for high places provided with a rod part 11 for moving the part 3 in the closing direction, a connecting part 22 provided at the lower end part of the sliding part 9 and insertion auxiliary parts 24 and 25 attached to the tips of the clamp parts 3 and 4 . [Selection] Figure 2

Description

  The present invention relates to a leakage ammeter, and more particularly to a clamp-type leakage ammeter suitable for measuring a leakage current of a low-voltage lead-in wire at a height of about 1 to 4 m above the head.

Surveys on general electric works are conducted at least once every four years in accordance with Article 96 of the Enforcement Regulations of the Electricity Business Act Article 57 and Article 92 of the Act (Regular Survey) Basic requirements and standard survey items have been established in order to properly implement this.
As one of the standard survey items in the distribution panel, it is stipulated to measure leakage current with a leakage ammeter at a measurable location in the distribution panel. As one item of the investigation in the absence, it is stipulated that the insulation state of the electric circuit is confirmed by a leak ammeter at a place where it can be measured outdoors.
However, the low-voltage lead-in wire, especially in places that can be measured outdoors, is stipulated in Article 116 of the Electrical Equipment Technical Standards and Interpretation as “House side: 2.5 m or more on the ground surface” and “Road crossing: 5 m or more on the ground surface”. Therefore, there are many cases where the height is 1 to 4 m above the head, and there is a problem that the work becomes large and measurement is difficult.

In order to solve such a problem, Patent Document 1 (Japanese Unexamined Patent Application Publication No. 2009-118586) supports an insulating container (22) and an insulating container (22) for housing a clamp-type ammeter (10). Insulation operation rod (24), lock insulation plate (26) attached to one side of the insulation vessel (22), spacer (27) and lock release insulation attached to the other side of the insulation vessel (22) An indirect hot wire tool (20) provided with a plate (28) and the like is described.
The work process for attaching the clamp-type ammeter (10) to the high-voltage hot wire A using the indirect hot wire tool (20) is as follows.
(1) Store the clamp-type ammeter (10) in the insulating container (22) and manually release the lock mechanism (16).
(2) The spacer (27) is sandwiched between the CT clamps (12a) and (12b) (see FIG. 3).
(3) Operate the insulation operating rod (24) to bring the clamp-type ammeter (10) closer to the high-voltage live wire A and from the gap generated in the CT clamps (12a) and (12b) opened by the spacer (27) The high-pressure live wire A is inserted (see FIG. 4).
(4) The curved portion of the spacer (27) is pressed against the high-pressure live wire A. Then, the spacer (27) is detached, and the CT clamps (12a) and (12b) are closed by the biasing force by the spring force (see FIG. 6).
(5) The insulating operation rod (24) is operated to bring the insulating container (22) closer to the high-pressure hot wire A. Then, the sliding portion (16a) is pushed up by the lock insulating plate (26), and the CT clamps (12a) and (12b) are fixed in a closed state (see FIG. 6).
(6) The insulating operation rod (24) is operated to move the insulating container (22) away from the high-pressure live line A. Then, the insulating container (22) is detached from the clamp type ammeter (10).

The work process for removing the clamp-type ammeter (10) from the high-voltage hot wire A using the indirect hot wire tool (20) is as follows.
(7) The clamp-type ammeter (10) is housed in the insulating container (22), and the U-shaped part (281) at the tip of the unlocking insulating plate (28) is connected to the protrusion (16c) of the sliding part (16a). ) (See FIG. 7).
(8) The insulating operation rod (24) is operated to move the insulating container (22) away from the high-pressure live line A. Then, the protrusion (16c) is pushed downward by the unlocking insulating plate (28), and the CT clamps (12a) and (12b) are opened (see FIG. 8).
(9) The insulating operation rod (24) is operated to move the insulating container (22) further away from the high-pressure live wire A. Then, the CT clamps (12a) and (12b) are separated from the high-pressure live line A and are simultaneously closed by urging by the spring force (see FIG. 9).
However, the indirect hot wire tool (20) described in Patent Document 1 is a work in which a spacer (27) is sandwiched between CT clamps (12a) and (12b), and a clamp type ammeter (10) is attached to a high voltage hot wire A. After removing the insulating container (22), when removing the clamp-type ammeter (10) from the high-voltage live wire A, the insulating container (22) is stored and the unlocking insulating plate (28) is placed on the protrusion (16c). There is a problem that it is difficult to remember the handling and takes a long time.

JP 2009-118586 A

The first object of the present invention is to solve the above-described problem and to perform a leakage current measurement operation with a leakage ammeter easily and in a short time.
Moreover, this invention makes it the 2nd subject to be able to perform the measurement operation | work of a leakage current easily and in a short time by attaching to the leakage ammeter currently marketed generally.
Furthermore, the third object of the present invention is to make it possible to easily measure the leakage current of the lead-in wire at a height of about 1 to 4 m above the head without using a stepladder or the like, and the clamp part of the leakage ammeter is closed. Even if it becomes a state, it makes it the 4th subject to enable a lead-in wire to be inserted in a clamp part, without resetting an open state again.

The invention according to claim 1 is a leakage ammeter comprising a main body part and a pair of clamp parts (3, 4) provided on the upper end side of the main body part so as to be openable and closable.
A driven part (12) attached to one clamp part (3);
A sliding portion (9) provided on the lower end side of the main body portion so as to be slidable within a predetermined range in the vertical direction;
An interlocking part (11) for moving the driven part (12) in a direction in which the one clamp part (3) is closed in conjunction with the upward sliding of the sliding part (9) ;
An elastic member (10) for urging the sliding portion (9) downward;
When the sliding portion (9) is at the lower limit position, the driven portion (12) is movable in both directions, and the one clamp portion (3) is openable and closable .

The invention according to claim 2 is the leakage ammeter according to claim 1,
A housing (5) attachable to a lower end side of the main body,
The sliding portion (9) is provided to be slidable within a predetermined range in the vertical direction with respect to the housing (5).

The invention according to claim 3 is the leakage ammeter according to claim 1 or 2 ,
The sliding portion (9) can hold the main body portion and has a connecting portion (22) capable of connecting a length portion at a lower end portion thereof.

The invention according to claim 4 is the leakage ammeter according to any one of claims 1 to 3 ,
A pair of insertion assisting portions (24, 25) respectively attached to the tips of the pair of clamp portions (3, 4);
The pair of insertion assisting portions (24, 25) is characterized in that the upper side is open in a state where the pair of clamp portions (3, 4) are closed.

According to the leakage ammeter of the invention according to claim 1, the driven portion (12) is moved in the direction in which one clamp portion (3) is closed in conjunction with the upward sliding of the sliding portion (9). Since the interlocking portion (11) is provided, the sliding portion (9) is set to the lower limit position, the pair of clamp portions (3, 4) are opened, and the lead-in wire (26) is placed in the clamp portion (3, 4). It is possible to close one clamp part (3) simply by inserting it into the upper part and then sliding the sliding part (9) upward, so that the leakage current can be measured easily and in a short time. Can do.
Further, an elastic member (10) for urging the sliding portion (9) downward is provided, and when the sliding portion (9) is at the lower limit position, the driven portion (12) is movable in both directions. Since the clamp part (3) can be freely opened and closed, the sliding part (9) is normally in the lower limit position, and the clamp part (3) can be held in the open state.
Then, with the clamp portions (3, 4) held open, the lead-in wire (26) is inserted into the clamp portions (3, 4) and once the sliding portion (9) is slid upward. Even if the clamp portions (3, 4) are closed and then the sliding portion (9) returns to the lower limit position, the clamp portions (3, 4) can be kept closed until the leakage current measurement is completed.
Furthermore, after the measurement of the leakage current is completed, the clamps (3, 4) can be pushed open by the lead-in wire (26) simply by pulling the leakage ammeter downward. Can be removed.

According to the invention according to claim 2 , in addition to the effect of the invention according to claim 1, the housing (5) that can be attached to the lower end side of the main body is further provided, and the sliding portion (9) is the housing ( Since it is provided to be slidable within a predetermined range in the vertical direction with respect to 5), a commercially available leakage ammeter can be attached to the housing (5) for use.

According to the invention of claim 3, in addition to the effects of the invention according to claim 1 or 2, the sliding portion (9) with is capable of holding the main body portion, it can be connected to Takeshaku portion at its lower end Since it has a connecting part (22), it is possible to easily measure the leakage current of the lead-in wire at a height of about 1 to 4 m above the head without using a stepladder or the like.
That is, after connecting the length portion of an appropriate length to the connection portion (22) and opening the clamp portion (3), the lead wire (26) is held by the length portion and the clamp portion (3, 4). If you insert it inside and press the lower part of the clamp part (3, 4) against the lead-in line (26), the sliding part (9) slides upward and one clamp part (3) closes. Leakage ammeters can be easily set even for lead-in wires in high places, and the measurement of leakage current can be performed easily and in a short time.

According to the invention according to claim 4 , in addition to the effects of the invention according to any one of claims 1 to 3 , a pair of insertion assisting parts (24) respectively attached to the tips of the pair of clamp parts (3, 4). 25), and the pair of insertion assisting portions (24, 25) is open on the upper side in a state where the pair of clamping portions (3, 4) is closed, so that the clamping portions (3, 4) are closed. However, without operating the one clamp part (3) or the driven part (12) at all, the insertion auxiliary part (24, 25) is simply pushed into the lead-in line (26), and is inserted into the clamp part (3, 4). A lead-in wire (26) can be inserted.
In addition, even when the clamp portions (3, 4) that are opened are closed for some reason, the clamp portions (3, 4) are not set again in the open state. 3, 4) A lead-in wire (26) can be inserted.

FIG. 3 is a perspective view of an attachment constituting the leakage ammeter according to the first embodiment. The figure which shows the state which open | released the clamp part of the leakage ammeter which concerns on Example 1. FIG. The figure immediately after inserting a lead-in wire in the leak current meter concerning Example 1, and closing a clamp part. The figure just before removing the leakage ammeter which concerns on Example 1 from a lead-in wire. The figure which shows the other method of inserting a lead wire in the leakage ammeter which concerns on Example 1. FIG. The figure which shows the state which open | released and closed the clamp part of the leak ammeter which concerns on Example 2. FIG.

Hereinafter, embodiments of the present invention will be described by way of examples.
For the sake of convenience, in this specification, the side with the clamp part of the leakage ammeter (upper side in the drawing) is referred to as the upper side, and the side with the main body part of the leakage ammeter (lower side in the drawing) is referred to as the lower side.

FIG. 1 is a perspective view of an attachment 1 constituting the leakage ammeter according to the first embodiment. FIG. 2 is a perspective view of the leakage ammeter according to the first embodiment in which a leakage ammeter 2 generally sold is attached to the attachment 1. It is a figure (Drawing 2 (A) is a figure seen from the front side, Drawing 2 (B) is a figure seen from the back side) which shows a state where clamp parts 3 and 4 of a leak current meter concerning Example 1 were opened.
In addition, when the clamp parts 3 and 4 of the leak ammeter 2 are urged in the closing direction or the opening direction by a spring or the like, the spring or the like is removed and attached to the attachment 1.
As shown in FIGS. 1 and 2, the attachment 1 has a housing 5 into which the main body of the leakage ammeter 2 can be inserted, a protrusion 6 that can be inserted into a screw hole of the leakage ammeter 2, and the housing 5. A fixture 8 that can be fixed with a screw 7, a sliding portion 9 that can be inserted into the casing 5 and that can slide in the vertical direction with respect to the casing 5, and a sliding portion 9 from the lower surface of the casing 5. The elastic member 10 is urged downward.

One end of the rod portion 11 is pivotally supported on one side of the housing 5 and the lower portion of the other side, and the other end of the rod portion 11 has clamps 3 and 4 of the leak current meter 2. A driven portion 12 that can be attached to one of the clamp portions 3 is provided.
Since the follower 12 is substantially U-shaped and a cushioning material 13 such as a sponge is provided on the rod 11 side, when the main body of the leakage ammeter 2 is inserted into the housing 5, one of the clamps 3 is inserted from the side so that it can be mounted without rattling.
Further, the lower end portion of the housing 5 is provided with a retaining portion 14 that extends downward. The retaining portion 14 passes through a hole provided in the lower surface of the sliding portion 9, and a washer 15 larger than the hole is fixed to the lower end portion of the retaining portion 14 with a screw 16.
Therefore, even if the sliding portion 9 is urged downward by the elastic member 10 or pulled downward, it does not come out of the housing 5. Further, when the sliding portion 9 is pushed upward, the upper edge 18 of the sliding portion 9 faces the side surface of the housing 5 before the lower surface of the sliding portion 9 contacts the lower end portion of the housing 5. The sliding portion 9 can slide within a predetermined range in the vertical direction with respect to the housing 5.
An arc-shaped notch 19 is provided at the upper end of the other side surface of the housing 5 so that the dial portion does not collide when the main body of the leakage ammeter 2 is inserted into the housing 5. In order to prevent the display part of the leak current meter 2 from being hidden, a rectangular window part 20 is provided.

On the upper part of the other side surface of the sliding part 9, the display part of the leak current meter 2 is hidden in a state where the elastic member 10 urges downward and the lower surface of the sliding part 9 is in contact with the washer 15. In order to prevent this, a U-shaped cutout window 21 is provided.
In the state where the sliding portion 9 is pushed upward and the upper edge 18 hits the protrusion 17 and stops, the lower portion of the rod portion 11 is pushed by the upper end portion of the sliding portion 9, so that the driven portion 12. Will be in the state which can take only the position which the clamp part 3 closes.
On the contrary, when the sliding portion 9 is urged downward or pulled downward and the lower surface of the sliding portion 9 is in contact with the washer 15, the sliding portion 9 slides with the lower portion of the rod portion 11. Since there is a margin in which the rod portion 11 can rotate between the upper end portion of the moving portion 9, the driven portion 12 is movable between a position where the clamp portions 3, 4 are closed and a position where the clamp portion 3 is opened.
A connecting portion 22 extending downward is provided at the lower end portion of the sliding portion 9. The connecting portion 22 is for connecting a lengthy portion (not shown), and an L-shaped guide portion 23 is provided to receive a pin provided at the upper end of the lengthy portion and make it difficult to remove. It is.
The length portion may be a rod-like shape that can be connected to the connecting portion 22, but if the length portion can be expanded and contracted and a stopper is attached to the expansion and contraction portion, the length can be adjusted and fixed.
Leakage ammeter 2 can be easily attached to a low-voltage lead-in wire (hereinafter referred to as “lead-in wire”) at a height of about 1 to 4 m above the head without using a stepladder or the like by connecting a length portion to connecting portion 22. While being able to measure an electric current, the leakage ammeter 2 can be easily removed after that from a lead-in wire.

As shown in FIG. 2, insertion auxiliary portions 24 and 25 for a pair of lead wires are attached to the tips of the clamp portions 3 and 4.
The pair of insertion assisting portions 24 and 25 have rectangular holes into which the tip portions of the clamp portions 3 and 4 can be inserted, respectively.
Further, a recess having substantially the same width as that of the distal end portion of the clamp portion 3 is formed on the distal end side of the hole into which the clamp portion 3 of the insertion assisting portion 24 is inserted, and the clamp portion 4 of the insertion assisting portion 25 is inserted. A recess having a width slightly wider than the width of the distal end side of the insertion assisting portion 24 is formed on the distal end side of the hole.
Therefore, when closing the clamp portions 3 and 4, the distal end side of the insertion assisting portion 24 can enter the recess of the insertion assisting portion 25.

3 is a view immediately after inserting the lead-in wire 26 into the leakage ammeter according to the first embodiment and closing the clamp portions 3 and 4 (FIG. 3A is a view from the front side, and FIG. 3B is a view from the back side. Figure).
A procedure for attaching the leakage ammeter according to the first embodiment to the state shown in FIG. 3 from the state shown in FIG.
(1) The leakage ammeter in the state of FIG. 2 is brought close to the lead-in wire 26, and the lead-in wire 26 is inserted from the gap between the open clamp portions 3 and 4 and the insertion auxiliary portions 24 and 25.
(2) The length portion connected to the sliding portion 9 or the connecting portion 22 is operated to press the lower side of the clamp portions 3 and 4 against the lead-in wire 26, and the upper edge 18 of the sliding portion 9 has the protrusion 17. Slide upward (in the direction of the arrow on the lower side in FIG. 3) until it hits.
(3) Then, the lower part of the rod part 11 is pushed by the upper end part of the sliding part 9, the driven part 12 moves to the direction (arrow direction of FIG. 3 upper side) which the clamp part 3 closes, and the clamp part 3 is a shock absorbing material. 13 is pushed and closed (the state shown in FIG. 3 is reached).

FIG. 4 is a view (FIG. 4A is a view seen from the front side, and FIG. 4B is a view seen from the back side) immediately before the leakage ammeter according to the first embodiment is removed from the lead-in wire.
A procedure for removing the leakage ammeter according to the first embodiment from the state shown in FIG. 4 until the state shown in FIG.
(4) The clamp portions 3 and 4 and the insertion assisting portion 24 closing the lead-in wire 26 by operating the length portion connected to the sliding portion 9 or the connecting portion 22 of the leakage ammeter in the state of FIG. , 25 (position of FIG. 4).
(5) From the state of FIG. 4, the length portion connected to the sliding portion 9 or the connecting portion 22 is further operated to pull the leakage ammeter downward (in the arrow direction on the lower side of FIG. 4).
(6) Then, the driven part 12 is in a state of being movable between the position where the clamp part 3 is closed and the position where the clamp part 3 is opened, so that when the lead-in wire 26 pushes the clamp parts 3, 4 and the insertion auxiliary parts 24, 25. The clamp part 3 and the insertion auxiliary part 24 move in the opening direction (the arrow direction on the upper side in FIG. 4), and the lead-in wire 26 comes off from the clamp parts 3 and 4 (the state shown in FIG. 2 is obtained).

FIG. 5 is a view showing another method of inserting a lead-in wire into the leakage ammeter according to the first embodiment (FIG. 5A is a view seen from the front side, and FIG. 5B is a view seen from the back side).
From the state of FIG. 5 to the state of FIG. 3, that is, another procedure for attaching the leakage ammeter according to the first embodiment to the lead-in wire 26 will be described.
(7) Operate the length portion connected to the sliding portion 9 or the connecting portion 22, and set the leakage ammeter in the direction in which the lead-in wire 26 approaches the insertion auxiliary portions 24, 25 (in the direction of the straight arrow on the upper side in FIG. 5). The lead-in wire 26 is bitten into the joint portion between the insertion assisting portions 24 and 25 (the state shown in FIG. 5).
(8) Here, the sliding portion 9 is not pushed up so much by the urging force of the elastic member 10, and the driven portion 12 moves between a position where the clamp portions 3 and 4 are closed and a position where the clamp portion 3 is opened. Since it is in a free state, the clamp part 3 and the insertion auxiliary part 24 move in the opening direction (in the direction of the arcuate arrow on the upper side of FIG. Is inserted inside.
(9) After the lead-in wire 26 is inserted into the clamp portions 3 and 4, the length portion connected to the sliding portion 9 or the connecting portion 22 is further operated, and the lower side of the clamp portions 3 and 4 is moved. When pressed against the lead-in wire 26 and the sliding portion 9 is slid upward (in the direction of the arrow on the lower side in FIG. 3) until the upper edge 18 hits the protrusion 17, the driven portion 12 is connected to the clamp portion 3, as in (3) above. 4 moves in the closing direction (the arrow direction on the upper side in FIG. 3), and the clamp portion 3 is pushed by the cushioning material 13 to close (becomes the state shown in FIG. 3).

FIG. 6 is a view (only a view seen from the front side) showing a state in which the clamp portions 3 and 4 of the leakage ammeter according to the second embodiment are opened and closed.
In the second embodiment, a communication function is added to the commercially available leakage ammeter 2 used in the first embodiment, except for the case 5, the fixture 8 and the insertion assisting portions 24 and 25 of the first embodiment. The leakage ammeter 30 is replaced with the above.
And the rod part 11, the driven part 12, the cushioning material 13, the retaining part 14, the washer 15, the screw 16 and the protrusion 17 provided in the housing 5 of the first embodiment are attached to the main part of the leakage ammeter 30. Other configurations (sliding portion 9, elastic member 10, and length portion) are almost the same as those in the first embodiment.
Therefore, the number is changed to the rod part 31, the driven part 32, the cushioning material 33, the retaining part 34, the washer 35, the screw 36, and the protrusion 37 only for the configuration directly provided on the main body part of the leakage ammeter 30. About the structure of this, the same number as Example 1 is used and description is abbreviate | omitted.
Needless to say, the insertion assisting portions 24 and 25 of the first embodiment may be attached to the tips of the clamp portions 3 and 4 of the second embodiment.

The relationship between the movement of the sliding portion 9 and the movement of the clamp portions 3 and 4 in the leakage ammeter according to the second embodiment will be briefly described.
When the sliding portion 9 is urged downward or pulled downward and the lower surface of the sliding portion 9 is in contact with the washer 35 (the state shown in FIG. 6A), the rod portion Since there is room for the rod part 31 to be rotatable between the lower part of the slider 31 and the upper end part of the sliding part 9, the driven part 32 is movable between the position where the clamp part 3 is closed and the position where it is opened. .
In the state where the sliding portion 9 is pushed upward and the upper edge 18 hits the protrusion 37 and stops, the lower portion of the rod portion 31 is pushed by the upper end portion of the sliding portion 9, so that the driven portion 32. Will be in the state which can take only the position which the clamp part 3 closes.
Since these relationships are the same as the movement of the sliding portion 9 and the movement of the clamp portions 3 and 4 in the leakage current meter according to the first embodiment, the procedure for attaching the leakage current meter according to the second embodiment to the lead-in wire 26 is as follows. The procedure for attaching the leakage ammeter according to the first embodiment to the lead-in wire 26 is the same as the above procedure (1) to (3), and the procedure for removing the leakage ammeter according to the second embodiment from the lead-in wire 26 is also changed from the lead-in wire 26 to the first embodiment. It becomes the same as the said procedure (4)-(6) which removes the leakage ammeter which concerns.

The modification of the leakage ammeter which concerns on Example 1 and 2 is listed.
(1) In Example 1, the sliding part 9 holds the housing 5, and in Example 2, the sliding part 9 holds the main body of the leakage ammeter. The part 9 may not hold the case 5 or the main body part as long as it can slide within a predetermined range in the vertical direction with respect to the case 5 or the main body part of the leakage ammeter.
(2) In the first and second embodiments, the rod portions 11 and 31 are pivotally supported at one end so that the lower portion of the rod portion 11 is the upper end of the sliding portion 9 as the sliding portion 9 is pushed up. However, the mechanism for pushing up the sliding portion 9 and the interlocking mechanism of the driven portion 12 is not limited to such a mechanism. A mechanism such as a rack and pinion mechanism or a slider cam mechanism that changes linear motion to rotational motion may be used.
Therefore, in the claims, the configuration corresponding to the rod portions 11 and 31 is described as an interlocking portion.

(3) The leakage ammeter of Example 1 includes an elastic member 10 that urges the sliding portion 9 downward with respect to the housing 5, and the leakage ammeter of Example 2 leaks the sliding portion 9. Although the elastic member 10 that urges the main body of the ammeter downward is provided, the elastic member 10 may not be provided.
In such a case, it is better to provide a mechanism (such as a click mechanism) that temporarily holds the sliding portion 9 at either the upper limit position or the lower limit position.
(4) In the first and second embodiments, when the sliding portion 9 is at the lower limit position, the driven portion 12 is movable in both directions and one clamp portion 3 is openable and closable. Is moved to a position where one of the clamp portions 3 is opened, and when the sliding portion 9 is located at the upper limit position, the driven portion 12 is moved to a position where one of the clamp portions 3 is closed. Anyway.
As a mechanism for that purpose, the clamp mechanism 3 or 4 may be urged in the opening direction with the same mechanism as in the first and second embodiments, or when the sliding portion 9 is at the lower limit position, It is good also as a mechanism which moves the driven part 12 to the position which one clamp part 3 opens.
In such a case, the clamp portions 3 and 4 are held in the open state with the sliding portion 9 as the lower limit position, and the lead wire 26 is inserted in that state, and then the clamp portions 3 and 4 are closed with the slide portion 9 as the upper limit position. Holding the state and measuring the leakage current in that state, returning the sliding portion 9 to the lower limit position, holding the clamp portions 3 and 4 in the open state, and removing the leakage ammeter from the lead-in wire 26 in that state; Become.

(5) In Embodiments 1 and 2, the lower end of the sliding portion 9 has the connecting portion 22 that can connect the length portion, but if it is dedicated to leakage current measurement performed within the reach of the hand There is no need to provide the connecting portion 22.
Conversely, when dedicated to measuring the leakage current of a lead-in wire that is at a high place from the reachable range, the sliding portion 9 and an appropriate length of the length portion (which can be expanded and contracted) may be integrated. good.
(6) Although the first embodiment has the pair of insertion assisting portions 24 and 25 attached to the tips of the pair of clamp portions 3 and 4, respectively, the insertion assisting portions 24 and 25 are the same as in the second embodiment. May not be provided.
Further, instead of mounting the insertion assisting parts 24, 25, the shape of the tip part itself of the pair of clamp parts 3, 4 is such that the upper side is open when the pair of clamp parts 3, 4 is closed. It is good as a thing.

DESCRIPTION OF SYMBOLS 1 Attachment 2 Leakage ammeter currently sold 3, 4 Clamp part 5 Case 6 Protrusion 7 Screw 8 Fixing tool 9 Sliding part 10 Elastic member 11 Rod part 12 Drive part 13 Buffering material 14 Stopping part 15 Washer 16 Screw 17 ridge 18 upper edge 19 notch portion 20 window portion 21 notch window portion 22 connecting portion 23 guide portion 24, 25 auxiliary insertion portion 26 lead-in wire 31 rod portion 32 driven portion 33 cushioning material 34 retaining portion 35 washer 36 screw 37 Ridge

Claims (4)

A leakage ammeter comprising a main body part and a pair of clamp parts provided on the upper end side of the main body part so as to be freely opened and closed,
A follower mounted on one of the clamps;
A sliding portion provided on the lower end side of the main body portion so as to be slidable in a predetermined range in the vertical direction;
An interlocking portion that moves the driven portion in a direction in which the one clamp portion is closed in conjunction with the upward sliding of the sliding portion ;
An elastic member for urging the sliding portion downward ;
The leakage ammeter according to claim 1, wherein when the sliding portion is at a lower limit position, the driven portion is movable in both directions, and the one clamp portion is openable and closable . A housing that can be attached to the lower end of the main body;
The leakage ammeter according to claim 1, wherein the sliding portion is provided so as to be slidable within a predetermined range in the vertical direction with respect to the housing. Together with the sliding portion is capable of retaining the main body portion, the leakage current meter according to claim 1 or 2, characterized in that a connecting portion connectable to Takeshaku portion at its lower end. Having a pair of insertion assisting parts respectively attached to the tips of the pair of clamp parts;
The leakage ammeter according to any one of claims 1 to 3 , wherein the pair of insertion assisting portions are open on the upper side when the pair of clamp portions are closed.