JP2605225B2 - Uninterruptible replacement method for watt hour meter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a watt-hour meter installed at each power demand destination, such as a house, for measuring power consumption. If the meter is repaired in response to a malfunction or is temporarily replaced for inspection, the specified work such as replacement of the wattmeter can be performed without interruption without stopping the power supply to the customer. The present invention relates to a method for exchanging a watt hour meter without interruption using an uninterruptible replacement tool that can be performed.

[0002]

2. Description of the Related Art If a watt hour meter is replaced in a power outage state, a great deal of trouble will be caused to a demand destination. Therefore, as a bypass type uninterruptible power meter replacement tool for a watt hour meter capable of performing a watt hour meter replacement operation without an uninterruptible power supply, the present applicant has a configuration as disclosed in JP-A-6-141426. Suggesting things.

As shown in FIGS. 16 and 17, the uninterruptible replacement tool for a watt-hour meter proposed by the present applicant has a power amount on one side of a tool body 101 made of an electrically insulating material. A plurality of electric wires 102a to 102c on a power supply side and a load side electrically connected to an internal circuit of a meter (not shown), respectively.
And a plurality of electric wire engaging portions 104a to 104c and 105a to 105c which can be collectively inserted and engaged from the side with respect to 103a to 103c.
04a to 104c and 105a to 105c, the engaging portions 104a to 104c and 105a to 1
The receiving members 106 of the electric wires 102a to 102c and 103a to 103c inserted into and engaged with 05c are slidably opened and closed, and the electric wire engaging portions 104a to 104c and 105a to 105c of the tool main body 101 are provided.
5c from the upper surface of the tool body 101 to the wire engaging portions 104a to 104c and 105a to 105c.
Screw insertion holes 111a to 111c and 1
12a to 112c are provided, and these screw insertion holes 111
a-111c and 112a-112c have the above-mentioned engaging portions 104a-104
c and electric wires 1 inserted into and engaged with 105a to 105c
Electrode screws 107a-1 that break the coating of 02a-102c and 103a-103c and are electrically connected to each electric wire
07c and 108a to 108c are inserted, and female screw holes 109a to 109c into which the electrode screws 107a to 107c and 108a to 108c are screwed are provided. A plurality of conductors 109A to 109C electrically connected to each other are embedded in the tool main body 101 coaxially with the screw insertion holes 111a to 111c and 112a to 112c.

[0004]

According to the replacement method using the uninterruptible replacement tool for the watt hour meter having the above-mentioned configuration proposed by the present applicant, the bypass type which has been implemented before that time is used. Uninterruptible replacement method, that is, two or more energizing blocks that can be separately attached to a plurality of electric wires on the power supply side and the load side that are electrically connected to the internal circuit of the watt hour meter, respectively. In the method of connecting both ends of the plurality of bypass lead wires to the connection terminal, and conducting a plurality of sets of corresponding wires on the power supply side and the load side to each other via the lead wires, this is a disadvantage of the method. Eliminates problems such as incorrect connection or short circuit between the lead wire and each wire, or connection failure or disconnection caused by unstable connection terminal tightening force, and replaces the specified watt hour meter. Work safely and securely It has the advantage of obtaining.

[0005] However, in the replacement method using the uninterruptible replacement tool for a watt-hour meter having the above-mentioned configuration proposed by the applicant of the present invention, the electrode screws 107a to 107c and 1
Even if the covering of the electric wires 102a to 102c and 103a to 103c on the power supply side and the load side is broken by the tightening of 08a to 108c, and the corresponding electric wires are electrically connected in a bypass shape, the connection state is immediately changed from the outside. In the event that a connection error or connection failure occurs, it is not possible to respond quickly, and extra time is required for the prescribed replacement work, and many replacement work are performed one after another. It was not possible to fully respond to the desire to do so.

In order to meet this demand, a light emitting element such as an LED which is turned on by the flow of a load current is interposed in a bypass electric circuit extending between a power supply side electric wire and a corresponding load side electric wire to emit light. It is conceivable to check the bypass connection state by visually checking the lighting of the element.In this case, for example, if the power consumption of the power demand destination is small or the power consumption is zero, even if the connection is accurate, Even if it is performed, it is not possible to confirm whether the bypass connection state is appropriate because the light emitting element does not light up, and there has been a problem that a predetermined replacement operation is troublesome.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is possible to easily and accurately determine the bypass connection state between a power supply-side wire and a load-side wire from the outside, regardless of the amount of power used at a demand destination. It is an object of the present invention to provide an uninterruptible replacement method for a watt hour meter which can be confirmed and can perform a predetermined uninterruptible replacement operation very efficiently.

[0008]

In order to achieve the above object, an uninterruptible power supply replacement method for an electricity meter according to the present invention is formed on one side of a tool main body made of an electrically insulating material. A plurality of wire engaging portions which can be collectively inserted and engaged with a plurality of wires on a power supply side and a load side respectively electrically connected to an internal circuit of the watt hour meter, and these wire engaging portions; An electric wire receiving member that is slidably opened and closed on the opening side of the electric tool and receives the electric wire inserted and engaged in each engaging portion, and a portion corresponding to each electric wire engaging portion of the tool main body, Each of the wires is inserted and held in a screw insertion hole penetrated from the upper surface to each wire engaging portion, and breaks the coating of the wire inserted into and engaged with each of the above engaging portions at its tip blade portion with the screwing operation. An electrode screw that is electrically connected to the A plurality of conductors buried in the fixture main body and having female screw holes into which the above-mentioned electrode screws are screwed, and corresponding ones of the electrode screws corresponding on the power supply side and the load side are electrically connected to each other; Current transformers respectively attached to the bypass circuits between the plurality of electric wires on the side and the corresponding plurality of wires on the load side, and the load currents connected to the output terminals of the respective current transformers and passing through the bypass circuits. A non-interruptible replacement of the watt-hour meter using an uninterruptible replacement tool having a light-emitting element for bypass connection status display that lights up when the power flows, wherein the load current flowing through the bypass circuit is a constant value. When the value is less than 1, a resistance load is forcibly connected to the load side, and the lighting of the light emitting element is confirmed.

[0009]

According to the present invention, when the watt hour meter is replaced,
First, in a state in which the electric wire receiving members of the uninterruptible power tool are slid to release the electric wire engaging portions, hold the tool body and hold the electric wire engaging portions on the power supply side and the load side of the watt hour meter. The tool body is set to each electric wire by simultaneously inserting and engaging the electric wire from the side and closing the opening of each electric wire engaging portion by sliding the receiving member. Next, by sequentially tightening the electrode screws using an electric screwdriver or the like, the coating of each wire is broken by the tip blades of the electrode screws, and the electrode screws and the wires are electrically connected. As a result, the electric wire on the power supply side and the corresponding electric wire on the load side are electrically conducted through the conductor and the electrode screw buried in the tool body, and a connection state without erroneous connection is obtained. Replacement of the meter can be performed safely, reliably, and efficiently without interruption.

The output terminals of the current transformers attached to the bypass circuits between the plurality of electric wires on the power supply side and the corresponding plurality of electric wires on the load side in the tool used for such uninterruptible replacement work are provided. Since the light-emitting element for indicating the bypass connection state between the power supply side and the load side is connected, if the power supply side and the load side wires are bypass connected as predetermined, the load current flowing through the bypass circuit As a result, the light emitting element is turned on.

By the way, for example, when the power consumption of the power demand destination is small or the power consumption is zero, the light emitting element does not turn on even if the electric wires on the power supply side and the load side are correctly bypass connected as prescribed. . Therefore, in such a case, the lighting of the light emitting element is checked by forcibly connecting a resistive load to the load side. This allows the worker to visually check the lighting of the light-emitting element regardless of the amount of power used by the demand destination to accurately check the quality of the bypass connection state. Can be detected and the response can be promptly made.

[0012]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing an outline of an uninterruptible replacement method performed by using the uninterruptible replacement tool for a watt hour meter of the present invention, and FIG. 2 is a side view thereof.

In FIGS. 1 and 2, reference numeral 1 denotes a single-type watt-hour meter, which is mounted on the surface of an instrument mounting plate 2 fixed to a wall W or the like and electrically connected to an internal circuit thereof. The two electric wires 3a and 3b on the power supply side and the two electric wires 4a and 4b on the load side are exposed and arranged, respectively. The two electric wires 3a, 3b on the power supply side and the two electric wires 4a, 4b on the load side are respectively bundled into one thick conduit tube 3A, 4A and guided to the power supply and the load. As shown in FIG. 2, the vicinity of the connection between the electric wires 3a, 3b, 4a, and 4b and the watt hour meter 1 is bent in a substantially rectangular shape in a side view, as shown in FIG.

5 is for connecting the two electric wires 3a, 3b on the power supply side and the two electric wires 4a, 4b on the load side in a bypass manner when the watt-hour meter 1 is replaced or replaced. An uninterruptible replacement tool, the uninterruptible replacement tool 5
Is configured as follows.

FIGS. 3 to 5 are views showing a specific configuration of the uninterruptible replacement tool 5. In these figures, reference numeral 6 denotes a tool molded from an electrically insulating resin material such as hard vinyl chloride. In the main body, one side of the
Wires 3a, 3b and two wires 4a, 4 on the load side
A total of four wire engaging portions 7a, 7b and 8a, 8b which can be inserted and engaged collectively from the side with respect to b are formed in a substantially inverted U-shape in a front view. 6A is an upper lid of the tool body 6.

Reference numeral 9 denotes an electric wire receiving member provided on the opening side of the four electric wire engaging portions 7a, 7b and 8a, 8b, and a pair of right and left receiving pieces 9 divided in the longitudinal direction.
A, 9B, which are slidably openable and closable in left and right lateral directions along holes 10 formed in both side walls of the wire engaging portions 7a, 7b and 8a, 8b in the tool body 6. The electric wires 3a, 3b and 4 inserted and engaged with the respective electric wire engaging portions 7a, 7b and 8a, 8b
a and 4b are received and held. The receiving member 9 has an arc-shaped receiving surface, and has a circular cross section in this embodiment.

The hole 10 on one side of the tool body 6
As shown in FIG. 6, the left and right ends are formed in the shape of a vertically long hole, and the opening edges of the receiving pieces 9A and 9B are inclined with respect to the sliding direction as shown in FIG. It is edged so that it can be inserted from the direction, and is formed on the tapered surfaces 10A and 10B.

Reference numerals 11a, 11b and 12a, 12b denote the respective engaging portions 7a, 7b, 8 from the upper lid 6A of the tool body 6 corresponding to the respective wire engaging portions 7a, 7b, 8a, 8b.
a, 8b are screw insertion holes vertically provided, and these screw insertion holes 11a, 11b and 12a, 12b are
Electrode screws 13a, 13b and 14 to be screwed in
a and 14b are inserted.

The above electrode screws 13a, 13b and 14
As shown in FIGS. 7 and 8, these electrode screws 13a, 13b and 14a, 14
b, the wires 3a, 3b and 4a, 4b engaged with the wire engaging portions 7a, 7b, 8a, 8b and received and held by the receiving member 9 break the coating of the electrode screws. 13a, 13b and 14a, 14
The blade part 31A divided into four in the circumferential direction for electrically connecting b to each of the electric wires 3a, 3b and 4a, 4b is formed.

Reference numerals 15A, 15B, 15C, and 15D denote copper connection conductors embedded in the tool body 6 coaxially with the screw insertion holes 11a, 11b and 12a, 12b, as shown in FIG. The conductor 15A on the power supply side and the conductor 15B on the load side are connected with the rivet 1 in the space 6B of the tool body 6.
6A (FIGS. 10 and 11), the conductor 15C on the power supply side and the conductor 15C on the load side.
D is electrically connected to each other via lead wires 16B stopped by rivets 16b.

As shown in FIGS. 10 and 11, the conductors 15A to 15D are formed with female screw holes 15a for screwing the upper screw portions 31B of the electrode screws 13a, 13b and 14a, 14b. Electrode screws 13a, 1
3b, 14a, and 14b are screwed into the respective blade portions 31A so that the wire engaging portions 7a, 7b, and 8
a, 8b. The conductors 15A to 15D are formed with rivet connection holes 15b on the lead wire side as shown in FIGS.

Each of the above electrode screws 13a, 13b and 14
As shown in FIG. 7, a small-diameter non-threaded portion 31D is formed between the upper and lower threaded portions 31B and 31C.
When the a, 13b and 14a, 14b are unscrewed, the small-diameter non-threaded portion 31D is disengaged from the female screw portions 15a on the conductors 15A to 15D side by a fixed unscrewing amount, and idles. The heads of the electrode screws 13a, 13b and 14a, 14b are restricted from projecting upward from the upper lid 6A.

The above-mentioned electrode screws 13a, 13b and 14
The outer diameters of the wires 3a, 3b are slightly smaller than the width L between the left and right side surfaces 70A, 70B (FIG. 15) of the wire engaging portions 7a, 7b and 8a, 8b.
b and 4a, 4b are evenly pressed against the receiving member 9;
Left and right side surfaces 70A, 70B of a, 7b and 8a, 8b
Are adapted to restrict lateral displacement of the electric wires 3a, 3b and 4a, 4b.

The power supply side electric wire 3a and the load side electric wire 4a
Lead 16A which is a part of a bypass circuit between
As shown in FIG. 14, current transformers 19A and 19B are respectively attached to the lead wires 16B which are part of a bypass circuit between the power supply side electric wire 3b and the load side electric wire 4b, as shown in FIG. The output terminals of these current transformers 19A and 19B are connected to LEDs 20A and 20B as light emitting elements for confirming the connection between the power supply side and the load side.
0A, 20B are window holes 21A, 21A,
21B. Reference numerals 22A and 22B denote cord-like bodies for retaining the receiving pieces 9A and 9B to the tool body 6 side, respectively.

Next, a description will be given of a work for replacing the watt-hour meter 1 without interruption using the uninterruptible replacement tool 5 having the above-described configuration. First, a pair of left and right receiving pieces 9A, 9B of the receiving member 9 in the tool body 6 are respectively slid to release the electric wire engaging portions 7a, 7b and 8a, 8b, and the respective electrode screws 13a, 13b, 1
4a and 14b are moved so that their tip blade portions 31A are retracted from the wire engaging portions 7a and 7b and 8a and 8b.

In this state, holding the tool body 6, the electric wire engaging portions 7a, 7b and 8a, 8b are connected to the electric wires 3a, 3b and 4a, 4b on the power supply side and the load side of the wattmeter 1 from the front side. The plug-in engagement is performed at once. Then, a pair of receiving pieces 9A and 9B of the receiving member 9 are inclined as shown in FIG.
By inserting and sliding in the holes 10 while guiding them along the lines 0B, the opening sides of the wire engaging portions 7a, 7b and 8a, 8b are closed,
The tool body 6 is set on each of the wires 3a, 3b and 4a, 4b.

Since the receiving member 9 is divided into two in the longitudinal direction into a pair of receiving pieces 9A and 9B, the working space in the sliding direction for inserting and removing these receiving pieces 9A and 9B is small. Since the opening edge of the hole 10 is formed on the tapered surfaces 10A and 10B, the receiving pieces 9A and 9B can be inserted obliquely as shown in FIG. Even in a narrow space, a predetermined set and reset operation can be easily performed. In addition, since the receiving pieces 9A and 9B have a circular cross section, there is no directionality of insertion / removal into / from the hole 10 as compared with a rectangular one, so that the setting operation is further facilitated.

Next, using an electric torque driver or the like, the tip bit is connected to each of the electrode screws 13a, 13a.
Each of the electrode screws 13a, 13b and 14a, 14b is tightened while controlling the torque one by one by operating the torque driver after engaging with the driver grooves of the heads of the heads 3b, 14a, 14b. 13
The covering of the electric wires 3a, 3b and 4a, 4b is broken by the tip blade portions 31A of the a, 13b and 14a, 14b, and the electrode screws 13a, 13b, 14a, 14b and the electric wires 3a, 3b, 4a, 4b and Are electrically connected.

Here, since the tip blade portion 31A of each of the electrode screws 13a, 13b and 14a, 14b is divided into four in the circumferential direction, each of the electric wires 3a, 3b with a small torque.
And 4a, 4b can be broken, thereby reducing the required strength of the receiving pieces 9A, 9B, and making it easier to reduce the size of the entire tool. Further, by making the receiving pieces 9A and 9B circular in cross section, the electrode screws 13a and 13b and 14a and 14b
It is possible to increase the contact pressure when tightening to the a, 3b and 4a, 4b, further promoting the breaking performance of the coating.

The electric wire engaging portions 7a, 7b and 8a, 8b are connected to the electrode screws 13a, 13b, 14a, 14a, respectively.
Since both side surfaces 70A, 70B along the tightening direction of 14b are opposed to each other, each of the electric wires 3a, 3b, 4
The electrode screws 13a, 13b and 14 may be located at any position within the width L between the side surfaces 70A and 70B.
a, 14b, the coating is reliably broken, and the wires 3a, 3b and 4a, 4
Regardless of the difference in the diameter of b, both side surfaces 70A, 70B
Thus, the coating can be reliably broken without causing an error due to the lateral displacement due to the position regulating action of the cover.

As a result, the electric wires 3a, 3
b and the corresponding electric wires 4a, 4b on the load side, regardless of their diameters, have conductors 15A in the tool body 6.
~ 15D, lead wires 16A, 16B and electrode screw 13
By-pass conduction is ensured electrically through a, 13b, 14a, 14b.

In such a bypass state, the watt-hour meter 1 is detached and a new watt-hour meter 1 is attached, so that power supply to the load side is not stopped, and the watt-hour meter 1 is uninterrupted. Can be replaced.

In the replacement work as described above, the electric wires 3a and 3b on the power supply side and the corresponding electric wires 4a and 4a on the load side are connected.
4b is definitely bypassed, the current transformer 19
A and 19B detect the load current, and the LEDs 20A and 20B connected to these light up. Therefore, by visually recognizing whether or not the LEDs 20A and 20B are turned on during construction, it is possible to easily confirm whether or not there is a connection error or a connection failure, and to perform a proper connection reliably.

By the way, in the above-mentioned replacement work, a case where the power consumption of the demand destination is small and the load is very small, or a case where the power consumption is zero and there is no load are considered. In such a case, when the load current is, for example, about 1A, L
Since the lighting current of the EDs 20A and 20B is lower than the minimum current value, the LEDs 20A and 20B are not connected even if the connection is properly made.
B does not light. Therefore, in such a case, immediately after the bypass connection is completed, as shown in FIG. 14, for example, a resistance load Ro prepared separately from the tool such as a connection checker is forcibly and instantaneously connected in parallel to the load side. As a result, the load resistance is instantaneously increased, and the LEDs 20A, 20
It is possible to accurately and easily check whether or not bypass conduction is good or not by turning on B. In this case, it is preferable to use, for example, a connection checker having heat radiation performance such as a compact dryer because the resistance load involves heat generation.

When the replacement work of the watt-hour meter 1 is completed, the electrode screws 13a, 13b and 14a, 14b are sequentially unscrewed using an electric torque screwdriver or the like. 13a, 13b
And a small-diameter non-threaded portion 3 at an intermediate portion between 14a and 14b.
1D is formed, the electrode screws 13a, 13
As shown in FIG. 11, when the unscrewing amount becomes constant, the upper threaded portion 31B of the b, 14a, and 14b is disengaged from the female threaded hole 15a of the load 15A to 15D, and the small threaded portion 31D is disengaged. As a result, the heads of the electrode screws 13a, 13b and 14a, 14b are restricted from projecting above the upper lid 6A of the tool body 6. Therefore, there is no occurrence of a situation in which the electrode screws are inadvertently short-circuited via a conductor such as a driver bit, and the tool can be reset safely and properly.

The electrode screw 1 can be repeatedly used.
In the case where the 3a, 13b and 14a, 14b are worn or the like, these are removed from the insertion holes 11a, 11b and 1 of the tool body 6.
It is necessary to take out from 2a, 12b and exchange it. In such a case, after turning the tool body 6 upside down,
When the electrode screws 13a, 13b and 14a, 14b are unscrewed with a screwdriver or the like, the lower screw portion 31C engages with the female screw holes 15a of the conductors 15A to 15D and is screwed. ,
The electrode screws 13a, 13b and 14a, 14b can be pulled out from the insertion holes 11a, 11b and 12a, 12b, taken out from the tool body 6, and easily replaced.

In the above embodiment, the tool corresponding to the replacement of the single-type watt-hour meter has been described. However, the replacement of the single-type watt-hour meter in which the electric wires on the power supply side and the load side are increased by one each. Even with a corresponding tool, the same effects as those of the above embodiment can be obtained.

[0038]

As described above, according to the present invention, the output terminals of the current transformers respectively attached to the bypass circuits between the plurality of electric wires on the power supply side and the plurality of electric wires on the load side corresponding to these are connected. By using an uninterruptible replacement tool connecting a light emitting element that indicates a bypass connection state between the power supply side and the load side, when the power supply side and the load side electric wires are bypass connected as predetermined, By lighting the light emitting element with the load current flowing through the bypass electric circuit and visually checking the lighting of the light emitting element, it is possible to immediately confirm whether the bypass connection state is good or not. In addition, if the power consumption of the power demand destination is small or the power consumption is zero, and even if the power supply side and the load side wires are correctly bypass connected as predetermined, the light emitting element does not light up, By forcibly connecting a resistive load to the load side, the lighting of the light emitting element can be easily confirmed. Thus, regardless of the power consumption of the demand destination, the worker can visually confirm the lighting of the light emitting element to accurately determine whether the bypass connection state is good or not, and can also check the connection error and the connection failure. Detect immediately and respond quickly. Therefore, there is an effect that the replacement work of a large number of watt-hour meters can be performed one after another accurately, safely, and very efficiently without spending extra time for the predetermined replacement work.

[Brief description of the drawings]

FIG. 1 is a front view showing an outline of an uninterruptible replacement method performed by using an uninterruptible replacement tool for a watt hour meter of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a front view showing a specific configuration of an uninterruptible replacement tool of the watt hour meter.

FIG. 4 is a plan view of FIG. 3;

FIG. 5 is a right side view of FIG. 3;

FIG. 6 is a side view showing an insertion hole of a receiving member.

FIG. 7 is a front view showing an electrode screw.

FIG. 8 is a bottom view showing a tip blade portion of the electrode screw.

FIG. 9 is a plan view of the tool body with an upper lid removed.

FIG. 10 is a partially broken side view showing a screwed state of an electrode screw with a conductor.

FIG. 11 is a partially cutaway side view showing an idling state of an electrode screw with respect to a conductor.

FIG. 12 is a front view showing a conductor.

FIG. 13 is a side view of FIG.

FIG. 14 is an electric circuit diagram showing connection of LEDs.

FIG. 15 is a front view showing the insertion posture of the receiving piece.

FIG. 16 is a front view showing a conventional uninterruptible power replacement tool for a watt hour meter.

FIG. 17 is a vertical sectional side view of FIG. 16;

[Explanation of symbols]

 Reference Signs List 1 Electricity meter 3a, 3b Power supply side electric wire 4a, 4b Load side electric wire 5 Uninterruptible replacement tool 7a, 7b, 8a, 8b Electric wire engaging part 9 Electric wire receiving member 11a, 11b, 12a, 12b Screw insertion Holes 13a, 13b, 14a, 14b Electrode screw 15A to 15D Conductor 15a Female screw hole 19A, 19B Current transformer 20A, 20B LED (light emitting element) Ro Resistance load

 ──────────────────────────────────────────────────の Continued on the front page (72) Kenji Morita 2-82, Watanabe-dori, Chuo-ku, Fukuoka City, Fukuoka Prefecture Within Kyushu Electric Power Co., Inc. (72) Toshiyuki Kiyo, 2-chome Watanabe, Chuo-ku, Fukuoka City, Fukuoka Prefecture No. 1-82 Kyushu Electric Power Co., Inc. 1 Tokyo Equipment Manufacturing Co., Ltd. (72) Inventor Toshiro Kono 4445-1, Fukuma-cho, Munakata-gun, Fukuoka Prefecture Tokyo Equipment Manufacturing Co., Ltd. (72) Inventor Takeo Miyaishi 2-3-3 Higashitenma, Kita-ku, Osaka-shi, Osaka No. 21 Nichido Electric Works, Ltd. (72) Inventor Tatsuo Nomura 2-3-21 Higashi Tenma, Kita-ku, Osaka-shi, Osaka Nichido Electric Co., Ltd. Document JP flat 6-141426 (JP, A) JitsuHiraku Akira 61-119274 (JP, U) JitsuHiraku flat 4-51670 (JP, U)

Claims (1)

(57) [Claims] 1. A plurality of electric wires on a power supply side and a load side formed on one side of a tool body made of an electrically insulating material and electrically connected to an internal circuit of a watt hour meter. A plurality of wire engaging portions that can be inserted and engaged collectively from the wire, and a wire that is slidably provided on the opening side of these wire engaging portions and that receives the wire inserted and engaged in each engaging portion. A receiving member and a portion corresponding to each wire engaging portion of the tool main body are inserted and held in a screw insertion hole penetrated from the upper surface of the tool main body to each wire engaging portion, and the tip thereof with the screwing operation An electrode screw that is electrically connected to each wire by breaking the coating of the wire inserted and engaged with each of the engagement portions with the blade portion, and embedded in the tool body coaxially with the screw insertion hole, Each electrode screw has a female screw hole into which it is screwed. A plurality of conductors corresponding to each other on a source side and a load side are respectively attached to bypass electric paths between a plurality of conductors electrically connected to each other, a plurality of electric wires on a power supply side and a plurality of electric wires on a corresponding load side. Current transformer
The watt hour meter is turned off using an uninterruptible replacement tool that is connected to the output terminal of each of these current transformers and is provided with a light emitting element for indicating a bypass connection state that lights when a load current flows through the bypass electric circuit. A method for replacing by a power outage, wherein when a load current flowing through the bypass circuit is less than a predetermined value, a resistive load is forcibly connected to a load side to check lighting of the light emitting element. Uninterruptible replacement method for meter.