JPH045020Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention removably connects the power metering display body and the terminal body, and electrically connects the metering display unit and the terminal body using a connector. This is related to the connected electric energy measuring device.

[Prior Art] In recent years, when replacing a power consumption measuring device based on maintenance and inspection, it is required to perform the replacement while the power supply line remains in a live state. Therefore, a conventional idea has been known in which only the electric energy measurement display part is replaced while the terminal part side is kept in a live wire state. This is to prevent the disadvantages of replacing the terminal part, which is in a live wire state, due to a failure in the metering display part, whereas the terminal part can be used almost semi-permanently.

[Problems to be solved by the invention] However, this type of power meter has different rated values, such as 30A, 120A, and 200A, so the measurement display part and terminal part must be separated for each rated value. Each component had to be prepared in advance, which increased the number of parts and was extremely wasteful.

This invention was made in order to eliminate the above-mentioned conventional drawbacks, and the purpose is to reduce the number of parts and provide an efficient electric energy measuring device.

[Means for solving the problem] This invention includes a display unit that displays the rated value in the terminal unit, and a detector that detects the rated value of the terminal unit in the weighing display unit, and a detector that detects the rated value of the terminal unit. and an arithmetic circuit that calculates the rated value of the terminal section in response to a detection signal from the arithmetic circuit, and applies a pulse signal of a power amount corresponding to the rated value calculated by the arithmetic circuit to the count display circuit. do.

[Function] In this invention, terminal bodies with multiple ratings can be connected to one weighing display body.
It is possible to reduce the number of parts of the metering display main body and provide an efficient electric energy measuring device.

[Example] Hereinafter, an example of this invention will be described with reference to the drawings.

FIG. 1 is an electrical circuit diagram showing an example of a power meter according to this invention.

In the figure, 1 is a terminal portion, 2 is a power consumption measurement display portion, and both portions 1 and 2 are electrically connected by a connector ST. The terminal section 1 includes a voltage transformer CT that converts the load voltage of the circuit under test into a voltage proportional to it, a current transformer PT that converts the load current into a current proportional to it, and a voltage transformer ET for the power supply. , and a display section 15 that displays the rated value.

In addition, 1S, 2S and 1L, 2L are transformers.
External connection terminal for connecting the primary sides of CT, PT, and ET to the circuit under test.

On the other hand, the measurement display section 2 displays both transformers CT and PT.
A power pulse train conversion circuit 3 converts the output signal of the power pulse train converter ET into a multiplication pulse train, a counting display circuit 4 that counts and displays the pulses from the power pulse train converter 3, and obtains a DC voltage from the voltage of the voltage transformer ET to convert the power It includes a power supply circuit 5 that supplies DC voltage to the pulse train conversion circuit 3 and the count display circuit 4.

Further, the weighing display section 2 includes a detector 16 that reads the rated value of the terminal section 1 from the display section 15, and a determination section that receives a detection signal from the detector 16 and determines the rated value of the terminal section 1. It includes a circuit 17 and an arithmetic circuit 18 that receives the discrimination signal discriminated by the discrimination circuit 17 and converts it into an amount of power corresponding to the rated value.

This arithmetic circuit 18 includes, for example, a frequency dividing circuit 19 that divides the frequency of an output pulse from a power pulse train conversion circuit.
and output terminals 19a to 19n of this frequency dividing circuit 19.
and a switching circuit 20 that switches the output signal from and applies it to the count display circuit 4.

Further, the detector 16 includes, for example, a light emitting element D.
1, D2 and light receiving elements TR1, TR2.

FIG. 2 shows an example of the electric power meter according to this invention, with FIG. 2a being a side view and FIG. 2b being a plan view. In the figure, 21 is the terminal portion 1 shown in FIG.
Reference numeral 22 indicates a terminal section main body constituting the weighing display section 2, and 22 indicates a weighing display section main body forming the weighing display section 2.

The terminal body 21 is made of, for example, a metal base, and the weighing display body 22 is made of a metal cover with a display window 22a formed on the top surface and which closes the opening of the metal base 21. The frame 22b provided at the lower end of this cover 22 includes
A protrusion 24 equipped with a fastening member 23 made of a screw body
The cover 22 is removably fixed to the metal base 21 by fastening the fastening member 23 to a fixing piece 25 fixed to the outer wall of the metal base 21.

Inside the metal base 21, transformers CT, PT, and ET are mounted on an electrical insulating stand (not shown), and external connection terminals 1S and 2 for connection to the circuit under test are installed.
S, 1L, and 2L are fixed. Further, an electrically insulating base 26 as shown in FIGS. 3a and 3b is fixed to the upper opening of the metal base 21, and receiving terminals 27 of the connector ST are set on this base 26.

Further, a display section 15 for displaying the rated value of the terminal section 1 is set on the base 26, and this display section 1
5 is constructed by forming a through hole 15 in a light shielding plate, for example.

On the other hand, the lower opening of the cover 22 has a fourth
An electrically insulating base 29 as shown in figures a and b is fixed, and a connector is set on the base 26.
Plug-in terminal 30 inserted into receiving terminal 27 of ST
is set at the base 29.

Further, the base 29 includes light emitting elements D1 and D.
2 and a detector 16 consisting of light receiving elements TR1 and TR2.
is set.

Next, the operation of the above configuration will be explained.

The metal base 21 and the cover 22 are connected as shown in FIG. 2, and the terminal section 1 and the weighing display section 2 shown in FIG. ) External connection terminal 1
Connect to S, 2S and 1L, 2L.

This allows voltage transformer CT and current transformer PT to
A voltage proportional to the load voltage of the circuit under test and a current proportional to the load current are output from the circuit. The output signals of both transformers CT and PT are applied to a power pulse train conversion circuit 3 and converted into a multiplication pulse train.

On the other hand, the detector 16 detects the through hole 1 of the display section 15.
The arrangement and number of the terminal portions 5 are detected, and the detected signal is applied to the determination circuit 17 to determine the rated value of the terminal portion 1. Based on the discrimination signal discriminated by the discrimination circuit 17, the switching circuit 20 is driven, and the output terminals 19a to 19n of the frequency dividing circuit 19 are switched so as to display the amount of power corresponding to the rated value of the terminal section 1. ,
A frequency divided signal from the frequency dividing circuit 19 is applied to the count display circuit 4.

This allows the rated value of the terminal section 1 (for example,
30A, 120A, 200A), it becomes possible to measure the electric energy with one measurement display section 2, and the number of parts can be reduced to provide an efficient electric energy measuring device.

[Effects of the invention] As described above, according to this invention, it is possible to reduce the number of parts and provide an efficient electric energy measuring device.

[Brief explanation of the drawing]

Fig. 1 is an electric circuit diagram showing an embodiment of the electric energy measuring device according to this invention, Fig. 2 shows an example of the electric energy measuring device according to this invention, and Fig. 2a is a side view;
Fig. 3b shows a plan view, Fig. 3 shows an example of the terminal part side constituting the above-mentioned electric energy measuring device, Fig. 3a shows a side view,
FIG. 3b is a plan view, FIG. 4 is an example of the power measurement display section of the power meter, FIG. 4a is a side view, and FIG. 4b is a plan view. 1...Terminal section, 2...Measuring display section, ST...Connector, PT...Voltage transformer, CT...Current transformer, ET...Power supply voltage transformer, 3...Power pulse train conversion circuit, 4 ... Counting display circuit, 5 ... Power supply circuit, 1S, 2S, 1L, 2L ... External connection terminal, 15 ... Rated value display section, 16 ... Detector, 1
7...Discrimination circuit, 18...Arithmetic circuit, 21...Metal base, 22...Cover. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] In a power consumption measuring device in which a power consumption display unit and a terminal unit are removably connected and the measurement display unit and the terminal unit are electrically connected by a connector, the terminal unit is connected to the circuit under test. a voltage transformer that converts the load voltage of the circuit under test into a voltage proportional to it, a current transformer that converts the load current into a current proportional to it, and a display section that displays the rated value. The measurement display section includes a power pulse train conversion circuit that converts the output signals of both the transformers into a multiplication pulse train, a counting display circuit that counts and displays the pulses from the power pulse train conversion circuit, and a voltage display circuit that converts the output signals of the transformers into a multiplication pulse train, a counting display circuit that counts and displays the pulses from the power pulse train conversion circuit, and a voltage of the circuit under test. a power supply circuit that obtains a DC voltage from and supplies the DC voltage to the power pulse train conversion circuit and the count display circuit, a detector that detects the rated value display section set at the terminal section, and a detection signal from this detector. A discriminating circuit receives the discrimination signal and determines the rated value of the terminal section, and an arithmetic circuit receives the discriminating signal discriminated by the discriminating circuit and converts it into an electric energy corresponding to the rated value. A power amount measuring device characterized in that a pulse signal of power amount corresponding to a rated value is applied to the counting display circuit, and the power amount of multiple ratings is measured with one measurement display section.