JP2002267701A - Display terminal for electric energy consumption - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive display terminal for an electric energy consumption storable together with an electronic type small-sized wattmeter in an instrument box of a conventional size, and allowing replacement of the electronic type wattmeter efficiently. SOLUTION: A metal case 2 is attached to an attaching metal 1 fixed to an instrument box main body, using an attaching screw 3 inserted into a slot 22 of a flange 21 provided in both side faces. The case 2 is movable on the attaching metal 1 along the slot 22 only by loosening the attaching screw 3. The case 2 is fixed normally to attaching metal 1 in a condition neighboring to the electronic type wattmeter, and is movable to a position separated aside from the wattmeter when the wattmeter is replaced due to expiration of certification. A space for replacement work of the wattmeter is secured thereby without removing the metal case 2 to conduct the replacement work efficiently and easily.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power consumption display terminal, and more particularly to a power consumption display terminal for displaying power measured by an electronic watt-hour meter provided on the side of a power consumer.

[0002]

2. Description of the Related Art A metering system is provided at a portion connected from a service side distribution line to a customer side distribution line to measure the amount of power used by a power consumer. In the case of a high-voltage consumer, such power consumption cannot be directly measured, so that it is measured using a voltage and current converter.

[0003] In such a metering system for high-voltage consumers, a test terminal for connecting a service-side distribution line to a voltage and current converter-side distribution line is integrated with an electronic watt-hour meter (combined power supply and demand meter). In the instrument box. That is, only one electronic watt-hour meter is mounted in the instrument box.

Since this electronic watt-hour meter basically only measures the amount of electric power used, only very limited items such as electric power and electric energy based on the measured value are used. Cannot be displayed.

However, in recent years, there has been a demand for a function of displaying an additional item based on a measured value of an electronic watt-hour meter. For example, if you are trying to differentiate electricity rates by time of day, or even by season, if you want to display the amount of power used in each time of day and season, or when you need more detailed measurement and measurement items, There is a demand to display active power / reactive power, power factor, delay / advance, and the like.

[0006] In response to such a demand, a power consumption display terminal separate from the electronic watt-hour meter has been developed. Such a power consumption display terminal is provided in the vicinity of an electronic watt-hour meter, and communicates with the electronic watt-hour meter to display various items based on data measured by the electronic watt-hour meter. It is displayed.

[0007] Further, in the measurement of the amount of electric power used in the fee transaction, the watt hour meter has a verification period determined by the Measurement Law, and the watt hour meter is replaced with the verified watt hour meter every time the verification is completed. Must be replaced.

[0008]

By the way, in the conventional metering system, various displays based on data measured by the electronic watt-hour meter are performed by a separately used power consumption display terminal. However, such a power consumption display terminal is large and expensive.

Therefore, there is a demand for an inexpensive power consumption display terminal that inherits and improves the functions of the conventional power consumption display terminal, and furthermore, in order to ensure compatibility of power distribution equipment, an electronic watt-hour meter is required. There is a demand that the power consumption display terminal, the test terminal, and the like be housed together in a conventional-sized instrument box.

However, in order to store the electronic watt-hour meter and the power consumption display terminal together in a conventional-sized instrument box, it is necessary to reduce both of them.
Because there is a limit to the miniaturization of electronic watt-hour meters, the power consumption display terminal should be placed in a narrow space inside the instrument box, excluding the space occupied by the test terminal and the miniaturized electronic watt-hour meter. Must be attached. Moreover,
The power consumption display terminal needs to have a display area as large as possible in order to increase the amount of information, and in the replacement work of the electronic watt-hour meter that is performed regularly, so as not to disturb the work efficiency as much as possible. There is a need to.

The present invention has been made in view of the above points, and can be housed in a conventional instrument box together with a miniaturized electronic watt-hour meter, so that the electronic watt-hour meter can be efficiently replaced. It is an object of the present invention to provide an inexpensive power consumption display terminal that can be used.

[0012]

According to the present invention, in order to solve the above-mentioned problems, in a power consumption display terminal capable of displaying various information based on data measured by an electronic watt-hour meter, A mounting bracket fixed in the instrument box main body adjacent to the electronic watt-hour meter, a metal case housing an indicator and an electronic circuit therein and detachably attached to the mounting bracket, Mounting screws for fixing a metal case to the fixing bracket, wherein the metal case is provided with flanges on both sides formed with elongated holes through which the mounting screws are inserted, and the mounting screws are loosened. Thus, there is provided a used power amount display terminal characterized in that the terminal can be moved in a direction of coming and going with respect to the electronic watt-hour meter.

According to such a power consumption display terminal,
During normal use, fix the metal case to the mounting bracket with the mounting screw as close to the electronic watt-meter as possible, and loosen the mounting screw when replacing the electronic watt-hour meter when the certification expires. The case can be moved away from the electronic wattmeter. With this, the metal case fixed to the mounting bracket can be arranged in a state of being partially overlapped with the electronic watt-hour meter in the mounted state,
The space occupied by the electronic watt-hour meter can be effectively used. Also, when replacing the electronic watt-hour meter following the expiration of the certification, the metal case can be moved away from the electronic watt-hour meter, so it is possible to take sufficient working space around the electronic watt-hour meter, Therefore, the replacement work of the electronic watt-hour meter can be performed without removing the used power amount display terminal from the instrument box main body.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings, taking as an example a case where the present invention is applied to a weighing system for high-pressure customers.

FIG. 1 is an exploded perspective view showing a power consumption display terminal according to the present invention, and FIG. 2 is a perspective view showing an assembled state of the power consumption display terminal according to the present invention. The power consumption display terminal according to the present invention includes a mounting bracket 1, a metal case 2,
It is composed of a book mounting screw 3, a plastic block 4, a metal cover 5, and a cover sealing screw 6.

The mounting bracket 1 is mounted on the instrument box main body side to form a mounting base for mounting the metal case 2 thereon. The metal case 2 is an aluminum case integrally formed by a die-casting manufacturing technique, in which an electronic circuit board for processing measurement data sent from, for example, a liquid crystal display unit and an electronic watt-hour meter. And are accommodated. The mounting screw 3 is for fixing the metal case 2 to the mounting bracket 1. The plastic block 4 is a member that fixes a cable to which power and measurement data are supplied from an electronic watt-hour meter and that holds a terminal for connecting a cable that transmits measurement data to the outside. The metal cover 5 is for protecting the reset switch and the like provided on the plastic block 4 and the metal case 2 and has a door mechanism so as not to come off when it is opened and closed. The cover sealing screw 6 is connected to the metal cover 5.
Is fixed to the metal case 2.

FIG. 3 is a view showing details of the mounting bracket.
(A) is a front view of a mounting bracket, (B) is a bottom view of the mounting bracket. The mounting bracket 1 includes a base 11, an upright portion 12 erected from both side ends thereof, and a case receiving portion 13 extending parallel to the base 11 and extending outward from each other at the top of the upright portion 12. It is configured.

The base 11 is provided with mounting holes 14 and 15 for mounting the mounting bracket 1 to the instrument box main body.
The upright portion 12 is for holding the metal case 2 at a predetermined distance from the instrument box main body. The display window of the metal case 2 and the display window of the electronic watt-hour meter have substantially the same height. It is intended to make efficient use of the space occupied by the electronic wattmeter. The case receiving portion 13 is provided with mounting screws 3 for fixing the metal case 2.
Is provided, and the upper surface thereof is a flat sliding surface for sliding the metal case 2.

The base 11, the upright 12, and the
In addition, the case receiving portion 13 can be made at low cost because the metal plate cut or punched into a predetermined shape is simply bent.

FIGS. 4A and 4B show details of the metal case. FIG. 4A is a front view of the metal case, and FIG. 4B is a cross-sectional view taken along the line aa of FIG. The metal case 2 has flanges 21 on both sides thereof. The flange 21 has a long hole 22 for inserting the mounting screw 3 and a hole 23 for passing a string used for sealing. Is provided. The elongated hole 22 provided in the flange 21 allows the metal case 2 to slide on the surface of the case receiving portion 13 of the mounting bracket 1 with the mounting screw 3 loosened. By sliding the metal case 2 and moving it from a predetermined position, it is possible to secure a sufficient working space when replacing the electronic watt-hour meter, and to use this power usage display terminal. It is possible to efficiently replace the electronic watt-hour meter without removing it.

At the center of the metal case 2 is provided a large display window 24 for viewing a display disposed inside. In FIG. 4A, a block accommodating portion 25 for accommodating the plastic block 4 is formed in an upper right portion thereof. A hole 25a for fixing the plastic block 4 housed in the block housing portion 25 from the back side with a screw (not shown) is provided in the upper right part of the metal case 2, and the metal cover 5 is swingable. A bearing portion 25b that supports the shaft is provided. Further, a hole 2 for a reset switch is provided below the block accommodating portion 25.
6a, a hole 26b for a manual setting switch, a hole 27 for a manual meter reading connector, and a hole 28 for a display screen operation switch
a, 28b are provided. Here, metal case 2
Block 4, fitted with a reset switch hole 26a, a manual setting switch hole 26b, and a manual meter connector 2
7 is covered with a metal cover 5 at the time of use, and the metal cover 5 is fixed to the metal case 2 by a cover sealing screw 6. The metal cover 5 can be opened when a reset switch or the like is used. However, since the metal cover 5 is still attached to the bearing portion 25b of the metal case 2, the metal cover 5 falls off during the operation. No electric shock accidents occur.

The metal case 2 is shown in FIGS.
The back side is closed by the same aluminum lid 29 as shown in FIG. 5A and 5B are diagrams showing details of the mounting screw, in which FIG. 5A is a plan view of the head of the mounting screw, and FIG.
Is a side view of the mounting screw.

The mounting screw 3 has a columnar head 31, a shaft 32, and a thread 33. The head 31 is provided with a knurling process for preventing slippage on a side surface thereof, and is provided with a hole 34 through which a string used for sealing is passed. Furthermore, the head 31
Is provided with a cross hole 35 on the top surface.

FIG. 6 is a front view of the metering system showing the state of attachment of the power consumption display terminal, and FIG. 7 is a side view of the metering system showing the state of attachment of the power consumption display terminal.
In these figures, the illustrated weighing system 70 is for outdoor installation and is shown with the instrument box cover removed. Therefore, during normal use, an instrument box cover (not shown) is attached.

The metering system 70 is arranged in a meter box main body 71 indicated by a broken line from the top in the order of a power consumption display terminal 72, an electronic watt-hour meter 73, and a test terminal 74.

The power consumption display terminal 72 is constituted by fixing the metal case 2 to the mounting bracket 1 with the mounting screw 3. As shown in the side view of FIG. 7, by providing the mounting bracket 1, the metal case 2 can be held in a state of being pushed out to the front. Since the electronic watt-hour meter 73 has a projecting portion 73a projecting upward substantially at the center in the depth direction, a rectangular parallelepiped space including the projected shape of the projecting portion 73a usually has a dead space. However, since the metal case 2 can be attached and fixed at a position forward of the protruding portion 73a, the power consumption display terminal 72 can effectively use the dead space, and only that much. The size of the metal case 2 can be increased, and the display space can be increased.
Also, by pushing the metal case 2 to the front,
Display window 24 of metal case 2 and power consumption display terminal 72
When the display window and the display window are at substantially the same height and the mounting screw 3 is loosened, the metal case 2 can be smoothly slid along the case receiving portion 13 of the mounting bracket 1.

Next, when the verification of the electronic watt-hour meter 73 attached as described above is completed, the electronic watt-hour meter 73 must be replaced with a verified one. Will be described.

FIG. 8 is a front view of the weighing system showing an attached state of the used electric power display terminal when the electronic wattmeter is replaced, and FIG. 9 shows an attached state of the used electric energy display terminal when the electronic wattmeter is replaced. It is a side view of the weighing system shown.

In normal use, the metal case 2 of the power consumption display terminal 72 is attached with its lower end overlapping the projection 73a of the electronic watt-hour meter 73. The replacement work of the electronic watt-hour meter 73 cannot be performed.

When replacing the electronic watt-hour meter 73,
First, the mounting screw 3 and the flange 21 of the metal case 2
After removing the seal attached to the metal case 2,
Is loosened, and the metal case 2 is slid upward in the direction indicated by the arrow 75 in the drawing, whereupon the mounting screw 3 is tightened and temporarily fixed. The sliding amount of the metal case 2 at this time is determined by the length of the long hole 22 in the long axis direction.

By moving the metal case 2 upward, a sufficient working space is created between the metal case 2 and the electronic watt-hour meter 73. It becomes removable in the front direction shown. Therefore, replacement work such as removal of the electronic watt-hour meter 73 and installation of a new electronic watt-hour meter can be performed efficiently.

When the replacement of the electronic watt-hour meter is completed, the metal case 2 is slid downward until the lower end thereof contacts the electronic watt-hour meter 73, and the mounting screw 3 is sufficiently tightened there. The metal case 2 is fixed to the mounting bracket 1.

As described above, the replacement work of the electronic watt-hour meter can be performed without removing the used power amount display terminal 72 from the instrument box main body 71.

[0034]

As described above, according to the present invention, the metal case accommodating the display and the electronic circuit therein is mounted by using the mounting screws inserted into the long holes of the flanges provided on both sides of the metal case. It was configured to be attached to a mounting bracket fixed in the instrument box body. As a result, it is possible to move without removing the metal case and secure sufficient replacement work space for the electronic watt-hour meter by simply loosening the mounting screw. This can be easily performed without removing the power amount display terminal.

Further, since the metal case can be moved to the mounting bracket and fixed at a predetermined height from the instrument box main body, in the mounted state, the metal case is brought as close as possible to the electronic wattmeter, and The electric wattmeter can be arranged so as to overlap with the protruding portion thereof, and the space occupied by the electronic wattmeter can be effectively used.

Further, since the power consumption display terminal of the present invention can be housed in a conventional instrument box together with the miniaturized electronic watt-hour meter, the terminal is more compact and lower than the case of external attachment. The cost can be reduced, and application as a weighing system for low-pressure consumers becomes possible.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a power consumption display terminal according to the present invention.

FIG. 2 is a perspective view showing an assembled state of a power consumption display terminal according to the present invention;

3A and 3B are diagrams showing details of a mounting bracket, wherein FIG. 3A is a front view of the mounting bracket, and FIG. 3B is a bottom view of the mounting bracket.

FIG. 4 is a view showing details of a metal case, and FIG.
FIG. 2 is a front view of a metal case, and FIG. 2B is a cross-sectional view of FIG.

5A and 5B are diagrams showing details of the mounting screw, wherein FIG. 5A is a plan view of a head of the mounting screw, and FIG. 5B is a side view of the mounting screw.

FIG. 6 is a front view of the weighing system showing an attached state of the used power amount display terminal.

FIG. 7 is a side view of the weighing system showing an attached state of the used power amount display terminal.

FIG. 8 is a front view of the weighing system showing an attached state of the used power amount display terminal when the electronic wattmeter is replaced.

FIG. 9 is a side view of the metering system showing an attached state of the used power amount display terminal when the electronic wattmeter is replaced.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 mounting bracket 2 metal case 3 mounting screw 4 plastic block 5 metal cover 6 cover sealing screw 11 base 12 upright portion 13 case receiving portion 14, 15 mounting hole 16 screw hole 21 flange 22 long hole 24 display window 25 block housing Unit 29 Lid 70 Metering system 71 Instrument box main body 72 Display terminal of used electric energy 73 Electronic watt-hour meter 73a Projection 74 Test terminal

Claims (3)

[Claims] 1. A power consumption display terminal capable of displaying various information based on data measured by an electronic watt-hour meter, wherein the terminal is adjacent to the electronic watt-hour meter in an instrument box body. A metal case accommodating a display and an electronic circuit therein and being removably attached to the mounting metal, and a mounting screw for fixing the metal case to the fixing metal. The metal case is provided with flanges on both sides formed with long holes through which the mounting screws are inserted, and comes into contact with and separates from the electronic watt-hour meter in a state where the mounting screws are loosened. A power consumption display terminal characterized by being movable in a direction. 2. The power consumption display according to claim 1, wherein the mounting bracket has a display window of the electronic watt-hour meter and a display window of the metal case substantially at the same height. Terminal. 3. The mounting bracket has a base fixed to the instrument box main body by bending a metal plate sheared or punched into a predetermined shape, and an upright portion standing from both side ends thereof. The power consumption display terminal according to claim 1, wherein a case receiving portion is formed at a top portion of the upright portion and extends parallel to the base portion and outward from each other.