JPH0414752B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electronic watt-hour meter equipped with a battery for power failure compensation in a housing, and more specifically to a means for preventing discharge and consumption of the battery and a voltage circuit. The present invention relates to improvements in means for electrically connecting and disconnecting between a current circuit and a current circuit.

[Prior Art] Conventionally, an electronic watt-hour meter equipped with this kind of battery for compensating power outage has been disclosed, for example, in Japanese Utility Model Publication No. 57-375. Since it was always connected to use, the battery was unnecessarily discharged and consumed. That is, even though the meter is not used during manufacturing, factory shipment, verification, and use, the battery is still in use and is discharged and consumed. As an example of means for preventing battery discharge and consumption, the structures shown in FIGS. 6 to 9 can be considered.

In the figure, 1 is the base of the electricity meter, 2 is a terminal block attached to a predetermined location on this base 1, and this terminal block 2 has a power supply terminal part 3.
In addition to the load terminal section 4, a terminal section 5 for input/output to the internal circuit of the watt-hour meter, a terminal section 6 for voltage input,
Furthermore, a test terminal section 7 for electrical connection and disconnection between the voltage circuit and current circuit of the watt-hour meter is provided. The input/output terminal section 5 and the voltage input terminal section 6 are connected to the primary side of a current transformer 8, a voltage transformer 9, and a power transformer 10. The secondary outputs of the current transformer 8 and voltage transformer 9 are input to a power pulse train converter 11, and the secondary outputs of the power transformer 10 are input to a stabilized power supply device 12. The outputs of are inputted to a count display circuit 14 via a power pulse train converter 11 and a diode 13, respectively. Further, a battery 17 is further connected to the cathode side of the diode 13 via a switch 15 and a diode 16, and the output of the power pulse train converter 11 is input to the count display circuit 14. .

In the electronic watt-hour meter having the above configuration, the battery 17
supplies power to the count display circuit 14 when no power is applied;
Stores weighing values. Also, switch 15
It is kept open (OFF) from the time of manufacture and shipment from the factory until it is inspected, and then closed (ON) and sealed at the time of inspection.

7 and 8 specifically show the housing (outer circumference) of the electronic watt-hour meter shown in FIG. 6 above.

In the figure, a cover 18 is attached to the base 1 with sealing screws 19 and 20, and is sealed after verification. Reference numeral 21 denotes a terminal cover, which is attached to the terminal box portion of the base 1 with sealing screws 22 and sealed during use. In addition, the counting display circuit 1
4, power transformer 10, power pulse train converter 1
1. Components such as battery 17 and switch 15 are as follows:
As an example, it is housed in a housing as shown in the figure.

Figures 10 to 13 are, for example,
This is a diagram showing a test terminal 7 (see FIG. 9) that makes electrical connection and disconnection between a voltage circuit and a current circuit of a conventional watt-hour meter disclosed in Publication No. 179378. Part 7 is the terminal screw 2 for actual load.
3 and test terminal screws 24 are inserted into the holes 2a, 2b of the terminal block 2 with a predetermined pitch dimension L, and are further inserted into the holes 2a, 2b of the terminal block 2, respectively.
are screwed into the screw holes of the power supply terminal piece 3a and the voltage input terminal piece 6a, which are respectively arranged on the lower side. Reference numeral 25 denotes a slide piece used for electrical connection and disconnection between the two terminal screws 23 and 24, that is, connection and disconnection of the voltage circuit and the current circuit, and has a semicircular arc-shaped notch 25a on its tip side. Further, elongated holes 25b are formed on the body side, and the test terminal screw 24 inserted into the hole 2b through the elongated hole 25b is used as a guide to move in the left-right direction.

Next, the operation of the test terminal section 7 will be explained. First, when adjusting the measurement error and verifying the error of the electronic watt-hour meter, move the slide piece 25 to the right to electrically separate the terminal screws 23 and 24 as shown in Figures 10 and 11. By doing this, the voltage circuit and current circuit are opened. At this time, the insulation distance l between the actual load terminal screw 23 and the tip of the slide piece must be a value necessary for insulation protection of the imaginary load test device used for adjusting measurement errors. On the other hand, the pitch dimension L
is regulated by the dimensions of an auto-connector that is electrically connected to an imaginary load testing device used for adjusting measurement errors, etc., and it is difficult to increase the insulation distance l.

Next, when using the actual load, use the terminal screw 2 for the actual load.
3 and the test terminal screw 24, and remove the slide piece 2.
After moving 5 to the left side, remove both terminal screws 23 and 24.
is tightened to electrically connect both terminal screws 23 and 24 as shown in FIGS. 12 and 13, thereby connecting the voltage circuit and the current circuit.

By the way, adjusting the measurement error of an electronic watt-hour meter,
Tests and certifications are generally performed using the imaginary load test method. The imaginary load test method is a method in which the voltage and current applied to the electronic watt-hour meter are supplied from separate power sources.Compared to the actual load test method, the power supply equipment needs to be of a smaller capacity, and the voltage, current, and their phase are There is an advantage that the angle can be adjusted without interference.

When performing adjustment or testing using the imaginary load test method, it is necessary to electrically open the voltage circuit and current circuit of the electronic watt-hour meter. On the other hand, when actually using an electronic watt-hour meter,
Measurement cannot be performed unless the voltage circuit and current circuit are connected.

[Problems to be Solved by the Invention] As described above, the conventional electronic watt-hour meter is provided with the switch 15 as a means for preventing discharge and consumption of the battery 17 for power outage compensation. , usually the cover 1 as shown in FIG.
Therefore, during verification, it is necessary to remove the cover 18 and close the switch 15, resulting in poor workability. Also, if you forget to close it at this time and seal it, you will have to temporarily unseal the sealing screws 19 and 20 and remove the cover 18. Furthermore, after closing the switch 15, you will have to deal with the process of distribution, storage, installation and use. There was a problem that the battery 17 was unnecessarily discharged and consumed. Furthermore, conventional electronic power meters
Since the test terminal section 7 is configured as described above, both terminal screws 23, 2 are required for actual load use.
4 to move the slide piece 25 and electrically connect these two terminal screws, it is not only a hassle to have to tighten each of the terminal screws 23 and 24, but also There were also concerns about loosening and forgetting to tighten. Furthermore, during an imaginary load test, it has been difficult to ensure sufficient insulation protection for the electronic watt-hour meter body and the imaginary load test device, since the l dimension (insulation distance) cannot be sufficiently secured.

The present invention has been made to solve the above-mentioned problems, and makes it unnecessary to close the switch 15 when using an actual load, thereby preventing unnecessary discharge and consumption of the battery 17 during the process of installation and use. , there is no need to move the slide piece in order to use it under actual load, and there is no need to worry about loosening over time or forgetting to tighten it. It is an object of the present invention to provide an electronic watt-hour meter that can provide sufficient insulation protection for the device.

[Means for Solving the Problems] The electronic watt-hour meter of the present invention is configured so that the housing of the meter can be separated into an element part and a terminal part, and the element part and the terminal part can be separated and separated. By coupling, the switch for preventing discharge and consumption of the battery is opened and closed, and at the same time, the switch for connecting and opening the voltage circuit and the current circuit is opened and closed.

[Function] In the present invention, when the element part and the terminal part are connected, the switch for preventing discharge and consumption of the battery and the switch for connecting and opening the voltage circuit and the current circuit are automatically closed, and the switch for preventing discharge and consumption is closed. It is possible to prevent forgetting to close the valve and at the same time, it can be used under actual load. In addition, when the element section and the terminal section are separated, both of the switches can be opened to prevent the battery from discharging and depleting, and also to allow the battery to be subjected to an imaginary load test.

[Embodiment] Hereinafter, the present invention will be described with reference to an embodiment shown in FIGS. 1 to 5, in which parts corresponding to conventional ones are denoted by the same reference numerals. In Figures 1 to 3,
The count display circuit 14 and the like are housed inside the cover 18, and a switch 27 for electrically connecting and disconnecting the voltage circuit and current circuit of the electronic watt-hour meter is located near the back side of the cover 18. In addition, the plug terminals 28a, 28b, 28c
are provided to constitute the element section 29. The switches 26 and 27 are reed switches whose opening and closing are controlled by permanent magnets or electromagnets.

4 and 5 show the terminal section 30, in which the terminal block 2 is attached to the base 1,
A power supply terminal section 3 is provided inside this terminal block 2.
and the load terminal section 4 are housed, and the plug terminals 28a, 2 are housed on the surface side of the base 1.
Receipts 31a, corresponding to 8b and 28c, respectively.
31b and 31c are respectively provided, and these receivers 31a, 31b and 31c are connected to the power supply terminal section 3 and the load terminal section 4, respectively. The terminal section 30 is provided with a horizontally long permanent magnet 32 at a position facing each of the switches 26 and 27 of the element section.

Therefore, the cover 18 housing the element section 29
When the base 1 housing the terminal section 30 is connected in the same way as the conventional meter shown in FIGS. 7 and 8, the magnetic force of the permanent magnet 32 causes both switches 2
6 and 27 are automatically closed to connect the voltage circuit and current circuit of the electronic watt-hour meter, and the battery 1 for power outage compensation.
7 and the count display circuit 14 are electrically connected at the same time and can be used for actual load, and when the element section 29 and the terminal section 30 are separated, the switches 26 and 27 are automatically opened. A voltage circuit, a current circuit, a battery 17 and a count display circuit 14 are separated from each other.
are electrically opened at the same time, allowing an imaginary load test of the element section 29 to be carried out, and at the same time, the function of preventing discharge and consumption of the battery 17 is activated.

As described above, the electronic watt-hour meter of the present invention is configured such that the element section 29 and the terminal section 30 can be separated into the cover 18 side and the base 1 side, so that when adjusting measurement errors and testing, , element section 2
9 can be provided alone, and there is no need to provide it in combination with the terminal section 30. Therefore, it is sufficient to adjust and test the measurement error of the electronic watt-hour meter only on the element part 29, and in that case, the test terminal part (not shown) excluding the permanent magnet 32 from the terminal part 30 and the element part 29 in combination, the switch 26 will not close and the voltage circuit and current circuit can be kept electrically open, making it possible to perform an imaginary load test.

Furthermore, when the electronic watt-hour meter is actually used, the switch 26 can be closed by combining the element section 29 and the terminal section 30, and the voltage circuit and current circuit can be connected. Since the electrical connection state can be maintained, the electronic watt-hour meter can measure the amount of power used by the circuit under test.

In addition, even if the element section 29 is in a sealed state, if it is separated from the terminal section 30, the switch 27
are separated, so the battery 17 is not discharged and consumed, and the element part 29 and the terminal part 3 are connected when using an actual load.
Since 0 is connected, the switch 27 is automatically closed and power failure compensation can be performed.

In addition, in the above embodiment, the switch 26,
Although a reed switch is used as 27, for example, a micro switch is used, and its actuator comes into contact with the terminal part 30 when connecting the element part 29 and the terminal part 30, and operates. 27 may be closed.

Further, in order to ensure a high degree of insulation between the voltage circuit and the current circuit during adjustment or testing, a switch with a high dielectric strength value may be used as the switch 26.

[Effects of the Invention] As described above, according to the present invention, both switches are configured so that they are automatically closed only by connecting the element portion and the terminal portion. This eliminates the need to remove the cover and close the discharge wear prevention switch, move and tighten the slide piece 24, and prevent forgetting to close the discharge wear prevention switch and loosening of the tightening part of the slide piece over time. There is no need to worry about forgetting to tighten it, and it is also possible to improve the insulation protection of the electronic watt-hour meter body and the imaginary load test equipment during imaginary load tests. Further, since the element section and the terminal section are separated except when using the actual load, unnecessary discharge and consumption of the battery is prevented until the actual load is used, and a small and inexpensive battery can be used.

In addition, if the two switches described above are installed close to each other, one actuator for operating the switches can be provided by one actuator, which has the effect of making the structure inexpensive.

[Brief explanation of drawings]

Figures 1 to 5 all show one embodiment of the present invention, with Figure 1 being a block diagram showing the circuit configuration, Figure 2 being a side view of the element section, and Figure 3 being the rear view of the element part. Figure 4 is a front view of the terminal part, Figure 5 is a side view of the terminal part, Figures 6 to 13 all show conventional electronic watt-hour meters, and Figure 6 shows the circuit configuration. Figure 7 is a front view, Figure 8 is a block diagram showing
The figure is a side view, Figure 9 is a front view showing the terminal section,
Figures 0 and 11 are a front view and a cross-sectional view of the test terminal section, respectively, showing an enlarged view of section A in Figure 9;
FIGS. 12 and 13 are a front view and a cross-sectional view, respectively, showing the state when the slide piece is moved to the left from the positions shown in FIGS. 10 and 11. In the figure, 14 is a count display circuit (holding circuit);
17 is a battery (power supply), 26 and 27 are switches, 2
9 is an element section, and 30 is a terminal section. In each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] 1 A terminal section for connecting to the circuit under test, and a terminal section that is separably coupled to this terminal section via a terminal that can be freely connected and detached to detect the load voltage and load current level of the circuit under test and count the detection results. an element section having a holding circuit for displaying and memorizing and holding the measured value, and the element section has the voltage circuit and current circuit that are connected when the element section and the terminal section are connected and are opened when they are separated. An electronic watt-hour meter characterized in that it is equipped with a connection switch for connecting the holding circuit and its power supply for power outage compensation.