JP2000338141A - Apparatus and method for measuring voltage and apparatus and method for measuring electric energy - Google Patents

Abstract

PROBLEM TO BE SOLVED: To measure the voltage and the electric energy with high workability for a long period by detecting the voltage information by a sensor without electrically contacting the sensor with a conductor, and determining the voltage by the operation on the basis of the voltage. SOLUTION: A voltage sensor 2 outputs the voltage information between insulating coated-wires 8, 9 to an A/D converter through an operation amplifier and a filter part. A probe 3 is contacted with an electrode at a load 10 side of a NFB 7 to output the reference voltage to the A/D converter. When an SW4 is pressed, a CPU compares the voltage information with the reference voltage, detects the magnification and the phase difference (correction information), and stores the same in a storage part, and a value of the voltage information is corrected on the basis thereof and stored in the storage part as a voltage value. A current sensor 5 supplies the voltage in proportion to a current value to the A/D converter through the operation amplifier through the insulating coated-wire 8 at the load 10 side of the NFB 7, and stores the same in the storage part. The CPU reads out the voltage value and the current value, and determines the electric power by multiplying the same, the electric power is integrated by time to determine the electric energy, and the electric energy is displayed on a display unit 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for measuring a voltage or an electric energy, and more particularly to a technique for calibrating information on a voltage measured in a non-contact manner to measure a normal voltage or an electric energy.

[0002]

2. Description of the Related Art The use of electricity that began with electric lights is currently
It changes shape and is widespread. The reason is that electricity is safer and more accessible than other energies.

However, even with this safe and familiar electricity, it is not good to waste energy with limited resources.

[0004] In order to know how much electricity is wasted, there is a case where it is desired to know the detailed usage status of electric power. For example, in order to minimize waste of power of a company, there is a case where it is desired to know the use status of lighting and air conditioning for each floor. Even in ordinary households, the total usage can be found on the bill, but there are times when it is desired to know the usage of each room. Further, there are cases where it is desired to know the usage status per time.

In such a case, a device for measuring power is installed in a breaker assigned to each room and each area, and the amount of used power is checked. The power on which this power is based is obtained by multiplying the voltage by the current. Therefore, it is necessary to measure the voltage and the current.

Conventionally, current has been measured without contact using a magnetic field generated when the current flows. For example, the measurement is performed by passing the loop of the clamp CT through an electric wire to be measured.

On the other hand, voltage measurement is performed by directly connecting (connecting) a cord of a measuring instrument to an electrode. This connection is maintained by temporarily fixing a cord to the electrode. For example, the cord of the measuring instrument was fixed to the breaker terminal by bundling it with an electric wire.

Alternatively, the terminal of the breaker is sandwiched between alligator clips at the tip of the cord of the measuring instrument, and the terminals are connected (connected).

[0009]

However, the method of bundling the cord of the measuring instrument on the electric wire has a problem that the cord of the measuring instrument causes poor contact. For example, when the measuring instrument cord and the electric wire are bundled together at the breaker terminal, the breaker terminal originally does not have a structure in which a number of wires can be sandwiched, which causes a contact failure.

[0010] Further, when the terminals of the breaker are fixed with the alligator clips for a long period of time, there is a problem that the alligator clips come off due to vibration and deterioration of the spring.

Further, the switchboard on which the breaker is installed has little extra space, and if the cord of the measuring instrument is fixed to the electrode, the lid cannot be closed.

Accordingly, a first problem to be solved by the present invention is to solve the above problems.

A second problem to be solved by the present invention is as follows.
An object of the present invention is to provide a technique capable of obtaining a voltage and an electric energy with good workability.

[0014]

An object of the present invention is to provide a device for measuring voltage, a sensor for detecting voltage information in a state in which the conductor is not in electrical contact with the conductor, and a voltage information from the sensor. A voltage measuring device is characterized in that the voltage measuring device further comprises a calculating means for obtaining a voltage.

In particular, there is provided a device for measuring a voltage, a sensor for detecting voltage information in a state in which the conductor is not in electrical contact with the conductor, and correction information for obtaining a voltage from the voltage information from the sensor. The problem is solved by a voltage measuring device comprising: a correction information measuring means for measuring; and a calculating means for obtaining a voltage from voltage information from the sensor and correction information from the correction information measuring means.

Further, there is provided a device for measuring voltage, a sensor for detecting voltage information in a state where the conductor is not in electrical contact with the conductor, and correction information for obtaining a voltage from the voltage information from the sensor. , A storage unit for storing the correction information from the correction information measuring unit, reading the correction information from the storage unit, and obtaining a voltage from the correction information and the voltage information from the sensor. The voltage measurement device is characterized by having a calculation means.

The sensor of the above voltage measuring device preferably has a configuration in which electrodes are arranged on both sides of a dielectric and a lead wire is connected to each electrode. Thus, voltage information can be obtained in an electrically non-contact state.

Further, it is preferable that the sensor of the voltage measuring device has an amplifying means for amplifying and outputting the detected voltage information. That is, the voltage information is amplified so as not to be influenced by the induction noise on the sensor lead wire. This allows amplification near the electrodes and is therefore less susceptible to induced noise.

The correction information measuring means of the voltage measuring device is
This is a means for measuring the voltage by contacting (electrically connecting) with the conductor. Since this correction information measuring means is only electrically connected to the conductor temporarily, there is no need to say that it must be electrically connected for the entire period of measuring the voltage and power, and therefore, You no longer have to worry that the connection may be lost sometime. That is, if it is a temporary time, there is no problem even if the observation is performed during that time.

The above voltage measuring device is, in particular, a device for measuring an AC voltage.

The object of the present invention is to provide an electric energy measuring apparatus comprising the above voltage measuring device and a current sensor for detecting a current of the conductor in a state where the conductor is not in electrical contact with the conductor. Solved by the device.

Further, the above-mentioned problem is a method of measuring a voltage, wherein a step A of detecting voltage information in a state where the conductor is not in electrical contact with the conductor, and a step of electrically contacting the conductor. The present invention is solved by a voltage measuring method, comprising: a step B for temporarily measuring a voltage in a state; and a step E for obtaining a voltage from the voltage information obtained in the step A and the voltage obtained in the step B.

In particular, there is provided a method for measuring a voltage, comprising: a step A for detecting voltage information in a state where the conductor is not in electrical contact with the conductor; Step B, which determines the phase and amplitude from the voltage obtained in step B, and step F, which calculates the voltage from the voltage information obtained in step A and the phase and amplitude obtained in step C. And a voltage measuring method characterized by having the following.

Further, there is provided a method for measuring a voltage, wherein a step A of detecting voltage information in a state of being electrically non-contact with the conductor, and a step of detecting the voltage in a state of being electrically contacted with the conductor. Step B for temporarily measuring, and step B
Step C for obtaining the phase and amplitude from the voltage obtained in step C, step D for storing the phase and amplitude obtained in step C, reading the phase and amplitude stored in step D, and reading the read phase and amplitude. And the step A
And a step G of obtaining a voltage from the voltage information according to the above.

[0025] The above-mentioned problems include the steps described in the above voltage measuring method, the step of detecting the current of the conductor in a state where the conductor is not in electrical contact with the conductor, and the step of detecting the voltage obtained in the step. And calculating a power amount from the current and the current.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A voltage measuring apparatus according to the present invention comprises a sensor for detecting voltage information in a state in which the conductor is not in electrical contact with the conductor, and a calculating means for obtaining a voltage from the voltage information from the sensor. Having. In particular, a device for measuring a voltage, a sensor for detecting voltage information in a state where the conductor is not in electrical contact with the conductor, and a correction for measuring correction information for obtaining a voltage from the voltage information from the sensor An information measuring unit; and a calculating unit for calculating a voltage from the voltage information from the sensor and the correction information from the correction information measuring unit. Further, a device for measuring a voltage, wherein the sensor is configured to detect voltage information in a state where the conductor is not in electrical contact with the conductor, and measures correction information for obtaining a voltage from the voltage information from the sensor. Correction information measurement means, storage means for storing correction information from the correction information measurement means,
A calculating means for reading the correction information from the storage means and obtaining a voltage from the correction information and voltage information from the sensor; Further, it has an output means for outputting a calculation result by the calculation means as required.

An electric energy measuring apparatus according to the present invention comprises a sensor for detecting voltage information in a state in which the conductor is not in electrical contact with the conductor, an operation means for obtaining a voltage from the voltage information from the sensor, A current sensor for detecting the current of the conductor in a state of being electrically non-contact with the conductor. In particular, a device for measuring the amount of power, a sensor that detects voltage information in a state that is electrically non-contact with the conductor,
Correction information measuring means for measuring correction information for obtaining a voltage from the voltage information from the sensor; calculating means for obtaining a voltage from the voltage information from the sensor and the correction information from the correction information measuring means; And a current sensor for detecting the current of this conductor in an electrically non-contact state. Furthermore, a device for measuring the amount of power, a sensor for detecting voltage information in a state where the conductor is not in electrical contact with the conductor, and measuring correction information for obtaining a voltage from the voltage information from the sensor. Correction information measuring means, storage means for storing the correction information from the correction information measuring means, and arithmetic means for reading the correction information from the storage means and obtaining a voltage from the correction information and the voltage information from the sensor. And a current sensor for detecting a current in the conductor in a state in which the conductor is not in electrical contact with the conductor. And it has a calculating means for calculating the electric energy from the voltage from the calculating means and the current from the current sensor. Further, it has an output means for outputting a calculation result by the calculation means as required.

The sensor of the above device has a structure in which electrodes are arranged on both sides of a dielectric and a lead wire is connected to each electrode. The correction information measuring means is a means for measuring a voltage by contacting (electrically connecting) with a conductor.

Further, the sensor of the above device has an amplifying means for amplifying and outputting the detected voltage information.

The voltage measuring method according to the present invention comprises a step A of detecting voltage information in a state where the conductor is not in electrical contact with the conductor, and a step of temporarily measuring the voltage in a state in which the conductor is in electrical contact with the conductor. There is a step B for measuring and a step E for obtaining a voltage from the voltage information obtained in the step A and the voltage obtained in the step B. In particular, a method for measuring a voltage, wherein a step A of detecting voltage information in a state in which the conductor is not electrically contacted and a step of temporarily measuring the voltage in a state in which the conductor is electrically contacted B, a step C for obtaining a phase and an amplitude from the voltage obtained in the step B, and a step F for obtaining a voltage from the voltage information obtained in the step A and the phase and the amplitude obtained in the step C.
And Further, there is provided a method of measuring voltage, comprising: a step A of detecting voltage information in a state where the conductor is not in electrical contact with the conductor; and a step of temporarily measuring the voltage in a state where the conductor is in electrical contact with the conductor. Measuring step B and step B
Step C for obtaining the phase and amplitude from the voltage obtained in step C, step D for storing the phase and amplitude obtained in step C, reading the phase and amplitude stored in step D, and reading the read phase and amplitude. And the step A
And obtaining a voltage from the voltage information according to

The method for measuring electric energy according to the present invention comprises a step A of detecting voltage information in a state in which the conductor is not in electrical contact with the conductor, and a step of temporarily measuring the voltage in a state in which the conductor is in electrical contact with the conductor. Step B, measuring the voltage from the voltage information obtained in step A and the voltage obtained in step B, and detecting a current in the conductor in a state in which the conductor is not in electrical contact with the conductor. And obtaining a power amount from the voltage and the current obtained in the above step. In particular, there is provided a method of measuring the amount of electric power, comprising: a step A of detecting voltage information in a state where the conductor is not in electrical contact with the conductor; A measuring step B, a step C for obtaining a phase and an amplitude from the voltage obtained in the step B, a step F for obtaining a voltage from the voltage information obtained in the step A, and the phase and amplitude obtained in the step C; The method includes a step of detecting a current of the conductor in a state where the conductor is not in electrical contact with the conductor, and a step of calculating a power amount from the voltage and the current obtained in the step. Further, there is provided a method of measuring the amount of electric power, comprising: a step A of detecting voltage information in a state where the conductor is not in electrical contact with the conductor; , A step C for obtaining the phase and amplitude from the voltage obtained in step B, a step D for storing the phase and amplitude obtained in step C, and a phase and amplitude stored in step D Reading a current, and obtaining a voltage from the read phase and amplitude and the voltage information obtained in the step A, a step of detecting a current of the conductor in a state in which the conductor is not in electrical contact with the conductor, Obtaining a power amount from the voltage and the current obtained in the step.

Hereinafter, a more detailed description will be given with reference to FIGS.

In FIG. 1, reference numeral 1 denotes a watt-hour meter. Watt hour meter 1
Is to calculate an electric power by multiplying an AC voltage and an AC current, and further integrate the electric power with time to calculate an electric energy.

2 is a voltage sensor. Voltage sensor 2
Is installed between the insulated wire 8 and the insulated wire 9,
The voltage information during this time is detected and output to the watt hour meter 1 via a lead wire (cable).

The voltage sensor 2 according to the present embodiment is a capacitor type sensor utilizing the movement of electric charges.
That is, the voltage sensor 2 has a structure in which the dielectric C is sandwiched between the electrode A and the electrode B, and the whole is covered with an insulator. Then, the electrode A side is fixed to the insulated wire 8 and the electrode B side is fixed to the insulated wire 9. This fixation can be easily performed by winding with an insulating tape or the like.

When a voltage difference is generated between the insulated wire 8 and the insulated wire 9, charges move to the dielectric C of the voltage sensor 2. Due to the movement of the electric charge, a voltage difference between the electrode A and the electrode B is generated, which is related to the voltage difference between the insulated wire 8 and the insulated wire 9. This voltage difference is measured in a non-contact manner with the conductive wire (the wire of the insulating coated wire 8 or the insulating coated wire 9), and although the phase is shifted, the magnitude is proportional to the voltage difference. In the specification, this is also referred to as voltage information.)

Reference numeral 3 denotes a probe. The probe 3 is connected to the watt-hour meter 1 and transmits a voltage contacting the tip thereof to the watt-hour meter 1.

The reason why the probe 3 is used is to calibrate the voltage information by the voltage sensor 2 based on the voltage measured by the probe 3 (hereinafter, also referred to as a reference voltage), and to obtain a regular voltage. Therefore, the voltage by the probe 3 need only be obtained temporarily, and need not be measured over a long period of time. That is, it is only necessary to measure the time over one cycle. After the calibration has been performed once, the probe 3 does not need to be used. That is, after the voltage is temporarily measured by the probe 3, the probe 3 can be removed. In this state, there is no probe 3 serving as a projection, and thus the lid of the distribution board can be closed.

4 is a push button switch (SW).
When the switch SW4 is pressed, a process of calibrating the voltage information from the voltage sensor 2 with the reference voltage is started.

Reference numeral 5 denotes a current sensor. Current sensor 5
Is composed of a clamp CT (open / close circuit transformer). The current sensor 5 outputs a current value to the watt hour meter 1 via a lead wire (cable).

Reference numeral 6 denotes a display for displaying the electric energy. still,
The display 6 includes, for example, an LCD, an LED, and a 7-segment LED. Although not shown, a printer for printing the amount of power displayed on the display 6 on paper is provided.

7 is a non-fuse breaker (hereinafter referred to as NFB).
). The NFB 7 is installed between the electric power supplied from the electric power company and the load 10, and shuts off the electric power when the load 10 uses a current larger than a specified value.

Here, the load 10 is an electric product used in each area and each room. For example, lighting equipment,
Refrigerators, air conditioners, televisions, etc.

Next, the internal configuration of the watt-hour meter 1 will be described.

The watt-hour meter 1 comprises a CPU 201, a storage unit 20
2. Voltage converter 203, operational amplifiers 204 and 205, filter unit 206, and A / D converters 207, 208 and 2
09.

The CPU 201 is a control device.
U201 controls the display unit 6, controls the storage unit 202,
The control of the D converters 207, 208, and 209, the calculation for calibrating the value of the voltage sensor 2, the calculation of electric power, the calculation of electric energy, and the monitoring of SW4 are performed. Here, voltage sensor 2
The calculation for calibrating the value, the calculation of the power, and the calculation of the power amount will be described.

First, the CPU 201 compares the reference voltage output from the probe 3 with the voltage information output from the voltage sensor 2 to detect a phase difference between the respective voltage waveforms.

Then, the CPU 201 causes the storage unit 202 to store the phase difference.

Next, the CPU 201 calibrates the phase by shifting the voltage information data by the phase difference.

Next, the CPU 201 divides the reference voltage by the voltage information whose phase has been calibrated to obtain a magnification.

Then, the CPU 201 causes the storage unit 202 to store the magnification.

With the above-described method, the CPU 201 detects a difference between the magnification and the phase (also referred to as correction information in this specification).

The CPU 201 calibrates the voltage information output from the voltage sensor 2 based on the correction information (magnification and phase difference), and obtains a voltage.

The CPU 201 multiplies the calibrated voltage by the current measured by the current sensor 5 to obtain power, and integrates the power to obtain a power amount.

Next, monitoring of SW4 in the CPU 201 will be described.

The CPU 201 monitors the state of the switch SW4 and, when the switch SW4 is pressed, starts a process of measuring a reference voltage and detecting correction information for correcting voltage information from the reference voltage.

The terminal c of the switch SW4 is pulled up and connected to the CPU 201. The terminal a is connected to GND. From the terminal c of the switch SW4, a signal of a normal H (high) level is output to the CPU 201. However, SW
When 4 is pressed, an L (low) level signal is output to the CPU.
Output to 201. By changing the level of this signal,
The CPU 201 can monitor the state of SW4.

The storage unit 202 stores and outputs data under the control of the CPU 201. Further, a program for controlling the CPU 201 is stored. The storage unit 202 includes, for example, a RAM and a ROM.

The voltage converter 203 converts the voltage in contact with the probe 3 into a voltage range that can be measured by the A / D converter 207 at the subsequent stage. For example, AC10
The A / D converter 207 converts 0 V or AC 200 V to AC 5 V that can be converted. The voltage converter 203 includes, for example, a transformer, a resistor, and a variable resistor.

The operational amplifiers 204 and 205 amplify the voltage of the input signal. This amplification is performed by converting the voltages of the voltage sensor 2 and the current sensor 5 into the A / D converter
This is performed for efficient conversion to 08 and 209. That is, this is performed to maximize the range of the analog signal that can be converted by the A / D converter. For example, it is assumed that the voltage output from the voltage sensor 2 is 0 to 2 V, and the A / D converter 208 measures an input signal in a range of 0 to 10 V. In this case, the operational amplifier 204 amplifies the voltage output from the voltage sensor 2 five times and outputs the amplified voltage to the A / D converter 208. Thereby, the A / D converter 208 can convert the input signal using the full scale of 0 to 10V.

The filter section 206 removes noise mixed in the signal of the voltage sensor 2. This is because the signal from the voltage sensor 2 is weak, and for this signal, for example, a cable or the like connected to the watt-hour meter 1 acts as an antenna, picks up surrounding radio waves, and includes noise. It is. When this noise is mixed,
It is difficult for the subsequent A / D converter 208 to convert to a correct value upon conversion. Therefore, noise is removed by the filter unit 206.

The A / D converters 207, 208, 209
It converts an analog signal into a digital value (A / D conversion). For example, assume that the resolution of the A / D converter 208 is 8 bits. It is also assumed that the analog signal that can be converted by the A / D converter 208 is 0 to 10V. In this case, A / D
The resolution of the converter 208 is 0.04 V (10 V / 255)
Becomes

On the other hand, it is assumed that the voltage between the insulated wire 8 and the insulated wire 9 changes from -100 to + 100V. The voltage sensor 2 detects the voltage (−100 to +100)
Although the phase is shifted to V), the voltage (for example, 0 to 2 V) proportional to the magnitude is output to the operational amplifier 204.
This voltage (0 to 2 V) becomes a voltage (0 to 10 V) amplified by a factor of 5 by the operational amplifier 204, and the A / D converter 20
8 is output.

The A / D converter 208 converts the input voltage (0 to 10 V) into a digital value.

As a result, the voltage (-100 to +100 V) between the insulated wire 8 and the insulated wire 9 becomes A / D
It is measured by the converter 208 at a resolution of 0.8 V (200 V / 255). FIG. 4 shows a correspondence table of the above description.

The A / D conversion is performed according to an instruction from the CPU 201. This is to enable the CPU 201 to measure the phase of the analog signal.

That is, the time of one cycle can be calculated from the increase / decrease of the A / D-converted digital value at regular time intervals. For example, the digital value is a value from 0 to 255,
The digital value gradually increases from 0 to 255,
Next, when it gradually decreases to 0, the time from 0 to the next 0 is one cycle time.

Next, FIG. 3 for explaining the operation of the embodiment of the present invention is a flowchart of the present embodiment.

First, the voltage sensor 2 is connected to the load 1 of the NFB 7.
It is installed between the insulated wire 8 and the insulated wire 9 on the 0 side. At this time, the insulating coatings of the insulated electric wires 8 and 9 are attached to the outside of the insulating coating without being peeled off and fixed.

With this fixation, the voltage sensor 2 outputs voltage information on the voltage between the insulating coated electric wire 8 and the insulating coated electric wire 9 to the operational amplifier 204.

The operational amplifier 204 converts this voltage information into A /
The voltage is amplified by a predetermined magnification to a voltage that can be efficiently converted by the D converter 208, and output to the filter unit 206 (step S301).

The filter section 206 removes noise from the input voltage information and outputs the result to the A / D converter 208 (step S302).

On the other hand, the CPU 201 compares the voltage information with the reference voltage, detects the magnification and the phase difference (correction information),
It is stored in the storage unit 202. This detection is performed only when SW4 is pressed (step S303).

Here, detection of the correction information will be described.

First, the probe 3 is brought into contact with the electrode of the NFB 7 on the load 10 side. Thereby, the reference voltage is output to voltage converter 203 (step S304).

Next, the user presses SW4. In response to this SW4 being pressed, the CPU 201 starts processing for detecting correction information.

Then, the CPU 201 sets the A / D converter 2
At 07, an instruction to convert the reference voltage into a digital signal is transmitted.

A / D converter 207 receiving this instruction
Converts the reference voltage into a digital signal (hereinafter, also referred to as a reference digital signal) and transmits the digital signal to the CPU 201.

Next, the CPU 201 sets the A / D converter 20
8, an instruction to convert the voltage information as an analog signal from the voltage sensor 2 into voltage information as a digital signal (hereinafter, also referred to as a voltage information digital signal) is transmitted.

A / D converter 208 receiving this instruction
Converts the analog voltage information into voltage information (voltage information digital signal) as a digital signal, and transmits the digital signal to the CPU 201.

On the other hand, upon receiving the reference digital signal and the voltage information digital signal, the CPU 201 compares each of them to detect a phase difference. The voltage information digital signal is calibrated by the phase difference.

Next, the reference digital signal is divided by the voltage information digital signal whose phase has been calibrated, and the magnification is detected.

In the above-described method, the CPU 201 detects correction information to be calibrated from the difference between the magnification and the phase. And
The CPU 201 stores the detected correction information in the storage unit 202.
(Step 305).

Here, the process of step 305 is first performed only once.

If the processing in step 305 is not performed, CPU 201 causes display section 6 to display that correction information has not been detected.

The CPU 201 calibrates the value of the voltage information digital signal based on the correction information stored in the storage unit 202. Then, the calibrated value is stored in the storage unit 202 as a voltage value.

By this calibration, the voltage information from the voltage sensor becomes an approximate voltage of the insulated wire 8 and the insulated wire 9. That is, it becomes an approximate value of the voltage supplied to the load 10 (step S306).

Next, the calculation of the power and the power amount will be described.

The current sensor 5 is installed so as to pass through the insulated wire 8 on the load 10 side of the NFB 7. At this time, since the clamp CT serving as the current sensor 5 is opened and the insulated wire 8 is passed through, the insulated wire 8 is not removed from the terminal of the NFB 7.

Then, a voltage proportional to the current value of the insulated wire 8 is output from the current sensor 5 to the operational amplifier 205.

The operational amplifier 205 amplifies this voltage and outputs it to the A / D converter 209.

The A / D converter 209 converts the input voltage into a digital signal and outputs the digital signal to the CPU 201.

The CPU 201 stores the digital signal input from the A / D converter 209 in the storage unit 202 as a current value (step 307).

On the other hand, the CPU 201 reads the voltage value and the current value stored in the storage unit 202, and calculates the power by multiplying the voltage value and the current value (step 308).

Next, this power is integrated (added) with time to calculate a power amount, and the power amount is displayed on the display 6 (step 309).

In the above description, the sensor according to the present invention has a structure in which the dielectric C is interposed between the electrode A and the electrode B and the whole is covered with an insulator. However, the sensor of the present invention is not limited to this structure.

For example, as shown in FIG. 5, a structure in which the electrode A and the electrode B are separated by using the air as the dielectric C may be used.

In this case, the electrode A side is connected to the insulated wire 8
Is wound around with an insulating tape or the like, and the electrode B side is wound around the insulating coated electric wire 9 with an insulating tape or the like and fixed.

Alternatively, the electrode A side is fixed to the insulated wire 8 by a clip or the like, and the electrode B side is fixed to the insulated wire 9.
And secure it with clips.

The voltage sensor 2 comprises an electrode A and an electrode B
A configuration in which a so-called amplifier circuit (amplifying means 21) for amplifying a voltage generated between the amplifier and the amplifier may be incorporated. Thereby, voltage information can be transmitted to watt-hour meter 1 so as not to be affected by induction noise on the lead wire.

The power supply supplied to the amplifier circuit includes, for example, a battery in the voltage sensor 2. Alternatively, power is supplied from the watt hour meter 1.

Next, the measurement results will be described with reference to FIGS.

FIG. 6 shows the result of measuring a single phase of 100V.

In FIG. 6, reference numeral 601 denotes a value (voltage information) obtained by amplifying the voltage detected by the voltage sensor 2 by 25 times by a built-in amplifier circuit (amplifying means 21).

Reference numeral 602 denotes a value (reference voltage) measured via the probe 3.

603 is a phase difference between the reference voltage and the voltage information.

The insulated wire 8 and the insulated wire 9 used in this measurement have a jacket diameter of 3.3 mm. The measurement was performed 12 times every 5 minutes.

FIG. 7 shows the result of measuring a single-phase 200V.

In FIG. 7, reference numeral 701 denotes a value (voltage information) obtained by amplifying the voltage detected by the voltage sensor 2 by 25 times using a built-in amplifier circuit (amplifying means 21).

Reference numeral 702 denotes a value (reference voltage) measured via the probe 3.

Reference numeral 703 denotes a phase difference between the reference voltage and the voltage information.

The insulated wire 8 and the insulated wire 9 used in this measurement have a jacket diameter of 16 mm. The measurement was performed 12 times every 5 minutes.

FIG. 8 shows the result of measurement by changing the distance between the terminal of the NFB 7 and the voltage sensor 2.

In FIG. 8, reference numeral 801 denotes a distance between the terminal of the NFB 7 and the voltage sensor 2.

Reference numeral 802 denotes a value (voltage information) obtained by amplifying the voltage detected by the voltage sensor 2 by 25 times using a built-in amplifier circuit (amplifying means 21).

Reference numeral 803 denotes a value (reference voltage) measured via the probe 3.

Reference numeral 804 denotes a phase difference between the reference voltage and the voltage information.

As shown in FIG. 8, the value (voltage information) output from the voltage sensor 2 is stored in the terminal of the NFB 7 and the voltage sensor 2.
Not much affected by distance.

FIG. 9 shows the results of measurements made by changing the distance between the insulated wire 8 and the insulated wire 9.

In FIG. 9, reference numeral 901 denotes a distance between the insulated wire 8 and the insulated wire 9.

Reference numeral 902 denotes a value (voltage information) obtained by amplifying the voltage detected by the voltage sensor 2 by 25 times using a built-in amplifier circuit (amplifying means 21).

Reference numeral 903 denotes a reference voltage measured by the probe 3.

As shown in FIG. 9, the value (voltage information) output from the voltage sensor 2 is based on the insulated wire 8 and the insulated wire 9.
Not much affected by distance.

[0124]

[Effect] When measuring voltage or electric energy for a long period of time, it can be obtained with good workability.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an embodiment according to the present invention.

FIG. 2 is a detailed configuration diagram of a watt hour meter according to the embodiment of the present invention.

FIG. 3 is a flowchart of the embodiment according to the present invention.

FIG. 4 shows the measured voltage and A / D of the present embodiment according to the present invention.
Correspondence table with digital value output from converter

FIG. 5 is a configuration diagram of a voltage sensor according to the present invention.

FIG. 6 is a table of measurement results according to the present invention.

FIG. 7 is a table of measurement results according to the present invention.

FIG. 8 is a table of measurement results according to the present invention.

FIG. 9 is a table of measurement results according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Watt-hour meter 2 Voltage sensor 3 Probe 4 Switch 5 Current sensor 6 Display 7 NFB 8,9 Insulation wire 10 Load 21 Amplification means

Claims (12)

[Claims] 1. An apparatus for measuring a voltage, comprising: a sensor for detecting voltage information in a state in which the conductor is not in electrical contact with the conductor; and a calculating means for obtaining a voltage from the voltage information from the sensor. A voltage measuring device characterized by the above-mentioned. 2. A device for measuring voltage, comprising: a sensor for detecting voltage information in a state in which the conductor is not in electrical contact with the conductor; and correction information for obtaining a voltage from the voltage information from the sensor. A voltage measuring device comprising: a correction information measuring means for measuring; and a calculating means for obtaining a voltage from voltage information from the sensor and correction information from the correction information measuring means. 3. An apparatus for measuring voltage, comprising: a sensor for detecting voltage information in a state where the conductor is not in electrical contact with the conductor; and correction information for obtaining a voltage from the voltage information from the sensor. Correction information measuring means for measuring; storage means for storing correction information from the correction information measuring means; readout of the correction information from the storage means; and calculation of obtaining a voltage from the correction information and voltage information from the sensor. And a voltage measuring device. 4. The voltage measuring device according to claim 1, wherein the sensor has a structure in which electrodes are arranged on both sides of a dielectric and lead wires are connected to the respective electrodes. 5. The voltage measuring apparatus according to claim 2, wherein the correction information measuring means is a means for measuring a voltage by electrically contacting the conductor. 6. The voltage measuring device according to claim 1, wherein the voltage measuring device is for measuring an AC voltage. 7. The sensor according to claim 1, wherein the sensor has amplification means for amplifying and outputting the detected voltage information.
The voltage measuring device according to claim 6. 8. A voltage measuring device according to claim 1, further comprising: a current sensor for detecting a current of the conductor in a state in which the conductor is not in electrical contact with the conductor. Electricity measurement device. 9. A method for measuring a voltage, comprising: a step A of detecting voltage information in a state of being electrically non-contact with the conductor; and temporarily measuring the voltage in a state of being electrically contacted with the conductor. A voltage measurement method, comprising: a step B of performing dynamic measurement; and a step E of obtaining a voltage from the voltage information obtained in the step A and the voltage obtained in the step B. 10. A method for measuring a voltage, comprising: a step A for detecting voltage information in a state in which the conductor is not in electrical contact with the conductor; Step B for determining the phase and amplitude from the voltage obtained in step B; step F for obtaining a voltage from the voltage information obtained in step A and the phase and amplitude obtained in step C And a voltage measuring method. 11. A method for measuring a voltage, comprising: a step A of detecting voltage information in a state in which the conductor is not in electrical contact with the conductor; Step B, which measures the phase and amplitude from the voltage obtained in step B; step D, which stores the phase and amplitude obtained in step C; Read the amplitude,
A step G of obtaining a voltage from the read phase and amplitude and the voltage information obtained in the step A. 12. The voltage measuring method according to claim 9, further comprising: detecting a current of the conductor in a state in which the conductor is not in electrical contact with the conductor; Obtaining a power amount from the obtained voltage and current.