JPH058538Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of application of the invention) The invention provides a method for connecting a power supply and demand meter with a transformer, such as a watt-hour meter with a transformer or a composite meter for power supply and demand with a transformer, and a test switch. This relates to a test switch adapter that can be installed.

(Background of the invention) Currently, a test switch is connected to a power supply and demand meter with a transformer. The test switch is used when conducting actual load tests, imaginary load tests, etc. The wiring for the actual load test is shown in FIG. 7, and the wiring for the imaginary load test is shown in FIG. 8.

During the actual load test, by inserting the actual load test connector (not shown) into the test switch 1, the connection of the test switch 1 is switched as shown in Figure 7, and the instrument transformer is connected. The secondary voltage of the current transformer 2 is applied to both the meter under test 3 and the standard 4, and the secondary current of the current transformer 5 is applied in series to the meter under test 3 and the standard 4 to determine the actual power used by the load. The quantity is the meter under test 3
and standard device 4 at the same time.

During the imaginary load test, by inserting the imaginary load test connector (not shown) into the test switch 1, the connection of the test switch 1 is switched as shown in Figure 8, and the instrument transformer is connected. The secondary sides of the transformer 2 and the current transformer 5 are connected to an alternative meter 6, and the meter under test 3 is connected to an imaginary load generator 7. As a result, the amount of electric power generated by the imaginary load generator 7 is measured simultaneously by the meter under test 3 and the standard meter 4.

In the test switch 1, when the connector is not connected, the corresponding meter-side terminal fitting and power load-side terminal fitting (for example, between 1S and 1S) are connected.

In addition, when replacing a meter while it is installed at a customer, a short-circuit connector (not shown) is inserted into the test switch 1, so that the corresponding meter side terminal fitting and power load can be replaced. At the same time, the power load side terminal fittings P ₁ , P ₂ , P ₃ connected to the secondary side of the voltage transformer 2 are opened, and the secondary side terminal fittings of the current transformer 5 are disconnected. A short circuit is established between the power supply load side terminal fittings 1S-1L and 3S-3L connected to the side. Thereby, the meter can be replaced safely without opening the secondary side of the current transformer 5.

By the way, in general, the terminal pitch of a power supply and demand meter and the terminal pitch of a test switch are different in structure and number of terminals, and therefore are not the same. In particular, in the case of electronic watt-hour meters and electronic power supply and demand composite meters,
Since pulse service terminals and check terminals are provided in addition to the power supply load terminals, the terminal pitch is significantly different from that of the test switch. Therefore, in the past, the connection between the terminals of the power supply and demand meter and the terminals of the test switch was made using flexible vinyl wires, which made the wiring work easier as each wire had to be connected one by one. isn't it.

Furthermore, since the transformer-equipped electric power supply and demand meter is housed in an instrument box together with the test switch, the work space is small, and therefore, it is required that the meter replacement work can be performed easily even in a narrow space.

(Purpose of the invention) The purpose of the invention is to solve the above-mentioned problems, facilitate wiring work between power supply and demand meters and test switches with different terminal pitches, and reduce the need for meter replacement work. To provide a switch adapter for testing that can be easily performed even in a narrow space.

(Characteristics of the invention) In order to achieve the above object, the present invention provides a movable adapter that connects a plurality of meter side screw connection terminals at the same pitch as the terminal pitch of a power supply and demand meter with a transformer so as to protrude rearward. The same number of switch side bar terminals arranged in the case and connected to the instrument side screw connection terminals are arranged in the fixed adapter case at the same pitch as the terminal pitch of the test switch, and the movable adapter case is , a terminal connection position where the meter-side screw connection terminal is screwed to the terminal fitting in contact with the front surface of the terminal board of the power supply and demand meter with the transformer; connected to the fixed adapter case so as to be movable between a retracted terminal non-connection position,
Then, all the screw connection terminals on the instrument side are brought into contact with the terminal fittings of the electric power supply and demand meter with transformer, and the bar-shaped terminals on the switch side are all brought into contact with the electric wire insertion holes of the measurement side terminal fittings of the test switch. The present invention is characterized in that the movable adapter case is inserted into the terminal and is moved to a terminal non-connection position where the movable adapter case does not interfere with the instrument replacement work when replacing the instrument.

(Embodiment of the invention) Fig. 3 shows an embodiment of the invention installed between an electronic power supply and demand composite meter and a test switch, and Fig. 1 shows an embodiment of the invention at its terminal. FIG. 2 shows a cross section at the fixing screw.

In Figure 3, the test switch 1 has a plurality of measurement side terminal fittings 8 and terminal screws 9 on one side, and a plurality of power supply load side terminal fittings 10 and terminal screws 11 on the other side, and has a plug insertion hole 12 in the center into which the plugs of the various connectors mentioned above are inserted.

The electronic power supply and demand composite meter 13 has multiple functions such as a normal wattmeter, a precision wattmeter, a reactive wattmeter, and a maximum demand wattmeter, and is covered on the outside by a base 14 and a meter cover 15. . Instrument cover 15 is attached to base 14 by screws 16. The instrument cover 15 is provided with a display window section 17 and an operation section cover 18 that can be opened and closed.
Various data are displayed through 7, and an operation section (not shown) can be operated by opening the operation section cover 18. A terminal board 19 is provided below the base 14, and a plurality of terminal fittings 20 are provided.
and a terminal screw 21 (FIG. 1). The terminal pitch of the terminal fitting 20 is smaller than that of the test switch 1 because there are many terminals.

The test switch adapter 22 includes a fixed adapter case 23 made of an insulating material and a movable adapter case 24 made of an insulating material, which is fixed to an instrument mounting plate (not shown).
and a guide plate 25. The guide plate 25 is
A guide groove 27 that is fixed to the fixed adapter case 23 and that fits into the pin 26 of the movable adapter case 24
The movable adapter case 24 is connected to the fixed adapter case 23 so as to be movable between the terminal connection position shown in FIG. 3 and the terminal non-connection position shown in FIG.

The internal structure of the test switch adapter 22 will be explained with reference to FIGS. 1 and 2.

A guide plate 25 is fixed to both sides of the back surface of the fixed adapter case 23 with screws 28, and the fixed adapter case 23 itself is fixed to an instrument mounting plate (not shown) with screws 29. A plurality of switch-side rod-shaped terminals 30 are fixed to the fixed adapter case 23 in a state of protruding downward. The pitch of the switch side rod-shaped terminals 30 is determined to be the same as the terminal pitch of the test switch 1. The switch side rod-shaped terminal 30 is inserted into the wire insertion hole 31 of the measurement side terminal fitting 8 of the test switch 1 and is electrically connected.

The movable adapter case 24 is a first case 24a.
and a second case 24b. The first case 24a has a pin 26, and the fixed adapter case 23 is connected via the pin 26 and the guide plate 25.
connected to. The first case 24a has a screw insertion hole 32 into which the screw 29 is inserted. 2nd case 2
4b has terminal fittings 20 with the same pitch as the terminal fittings 20 of the electronic power supply and demand composite meter 13.
The same number of conductive plates 33 are arranged so as to be insulated from each other, and one end thereof is connected to the switch side rod-shaped terminal 30 by a connecting wire 34. The other end of the conductive plate 33 is mechanically and electrically connected to the meter side screw connection terminal 35 by being press-fitted into a hole in the conductive plate 33 . The instrument side threaded connection terminal 35 has a connection screw 35a at its center. Instrument side screw connection terminal 35
protrudes to the outside through the terminal insertion hole 36 of the first case 24a. The connection screw 35a is connected to the terminal fitting 2
The meter-side threaded connection terminal 35 is connected to the terminal fitting 20 by being screwed into the screw hole 37 provided on the front surface of the 0. A driver insertion hole 38 into which a driver is inserted is provided in the portion of the second case 24b facing each connection screw 35a.

The first case 24a and the second case 24b are fixed with screws 39. A fixing screw 40 is attached to the first case 24a and the second case 24b, and the threaded portion thereof largely protrudes from the first case 24a. In order to fix the terminal block 41 in the terminal board 19 to the base 14, a bolt 42 is screwed into a fixing metal fitting 43, and a fixing screw 40 is screwed into this fixing metal fitting 43.

When connecting the electronic power supply and demand composite meter 13 and the test switch 1 using the test switch adapter 22, first, connect the switch side rod-shaped terminals 30 all at once to the test switch 1's meter side terminal. Insert the wire into the wire insertion hole 31 of the metal fitting 8 and tighten the terminal screw 9. Next, with the movable adapter case 24 moved to the terminal connection position shown in FIGS. 1 to 3, the movable adapter case 24 is brought into contact with the front surface of the terminal board 19,
The fixing screw 40 is screwed into the fixing fitting 43 and fixed. In this state, the instrument side threaded connection terminals 35 are all in contact with the terminal fitting 20, and if the connection screws 35a are sequentially screwed into the screw holes 37 of the terminal fitting 20, the instrument side threaded connection terminals 35 are in contact with the terminal fitting 20. Connection terminal 35
is the terminal fitting 20 of the electronic power supply and demand composite meter 13
connected to. Thereafter, the test switch 1 and the test switch adapter 22 are fixed to the instrument mounting plate with screws and screws 29, respectively. The connection completion state is shown in FIGS. 1-3. In this way, the switch side rod-shaped terminals 30 are all inserted into the wire insertion hole 31, and the meter side screw connection terminals 35 are brought into contact with the terminal fitting 20 all at once, so flexible electric wires can be used as in the conventional case. The wiring work can be made much easier than when the wires are inserted one by one into the terminal insertion hole 31 and the wire insertion hole 44 (FIG. 1) of the terminal fitting 20.

When replacing the electronic power supply and demand composite meter 13 while it is installed in a consumer, the fixing screw 40
from the fixing fitting 43, and each connecting screw 35a from the screw hole 37 of the terminal fitting 20. Then, in order to remove the movable adapter case 24 from the front surface of the terminal board 19, it is moved from the terminal connection position shown in FIGS. 1 to 3 to the terminal non-connection position shown in FIGS. 4 to 6.
This movement route is indicated by an arrow 45 in FIGS. 4 and 6. In the terminal non-connection position, the movable adapter case 24 is connected to the terminal board 19 as shown in FIGS.
Since the test switch adapter 22 is set back downward from the front of the electronic power supply and demand meter, when the screws of the electronic power supply and demand composite meter 13 are removed from the meter mounting plate, the test switch adapter 22 does not get in the way. 13 can be pulled forward, allowing instrument replacement work to be easily performed even in a narrow space such as an instrument box. In addition, the movable adapter case 24 is attached to the terminal board 1.
Also serves as the terminal cover for item 9.

The test switch adapter according to the present invention is particularly useful when replacing a conventional inductive meter with an electronic meter, since the conventional test switch can be used as is.

Although the illustrated embodiment is an example in which it is used in a complex electric power supply and demand meter with a transformer, the present invention is not limited to this, and the present invention is not limited to this. It can also be applied to meters etc.

(Effects of the invention) As explained above, according to the invention, the movable adapter connects a plurality of meter side screw connection terminals at the same pitch as the terminal pitch of a power supply and demand meter with a transformer so as to protrude rearward. The same number of switch side bar terminals arranged in the case and connected to the instrument side screw connection terminals are arranged in the fixed adapter case at the same pitch as the terminal pitch of the test switch, and the movable adapter case is , a terminal connection position where the meter side screw connection terminal is screwed to the terminal fitting in contact with the front surface of the terminal board of the power supply and demand meter with the transformer, and from the front side of the terminal board of the power supply and demand meter with the transformer. connected to the fixed adapter case so as to be movable between a retracted terminal non-connection position,
Then, all the threaded connection terminals on the meter side are brought into contact with the terminal fittings of the electric power supply and demand meter with transformer, and the bar-shaped terminals on the switch side are all brought into contact with the electric wire insertion holes of the measurement side terminal fittings of the test switch. At the same time, when replacing a meter, the movable adapter case is moved to a position where the terminals are not connected so that it does not interfere with the meter replacement work, so it can be easily inserted between an electronic demand and supply meter with a different terminal pitch and a test switch. Wiring work can be facilitated, and instrument replacement work can be easily performed even in a narrow space.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of the terminal section of an embodiment of the present invention installed between an electronic power supply and demand composite meter and a test switch, and Figure 2 is a section of the fixing screw. 3 is a perspective view, FIG. 4 is a sectional view of the terminal of an embodiment of the present invention with the movable adapter case moved to the non-terminal connection position, and FIG. 5 is a fixed view. Figure 6 is a cross-sectional view of the screw part, Figure 6 is a perspective view, Figure 7 is a circuit diagram showing the connection of the test switch during an actual load test, and Figure 8 is a diagram of the test switch during an imaginary load test. FIG. 3 is a circuit diagram showing connections. 1... Test switch, 8... Meter side terminal fitting,
10...Power load side terminal fitting, 13...Electronic power supply and demand composite instrument, 19...Terminal board, 20...Terminal fitting, 22...Test switch adapter, 23...
...Fixed adapter case, 24...Movable adapter case, 24a...First case, 24b...Second case, 25...Guide plate, 26...Pin, 27...
...Guide groove, 30...Switch side rod-shaped terminal, 31...
...Wire insertion hole, 33...Conductive plate, 34...Connection wire, 35...Instrument side screw connection terminal, 35a...
Connection screw, 37...screw hole, 40...fixing screw,
43...Fixing bracket, 44...Wire insertion hole.

Claims (1)

[Scope of utility model registration request] A plurality of meter side screw connection terminals are arranged in a movable adapter case so as to protrude rearward at the same pitch as the terminal pitch of the electric power supply and demand meter with a transformer, and are respectively connected to the meter side screw connection terminals. The same number of switch side bar terminals are arranged in a fixed adapter case at the same pitch as the terminal pitch of the test switch, and the movable adapter case is placed in contact with the front surface of the terminal board of the power supply and demand meter with transformer. The terminal is movable between a terminal connection position where the instrument side screw connection terminal is screwed to the terminal fitting and a terminal non-connection position where the terminal is retracted from the front surface of the terminal board of the power supply and demand meter with the transformer. A test switch adapter connected to a fixed adapter case.