JP3481719B2 - Method and apparatus for correcting phase of measured values of distribution line - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to each measuring sensor which is generated based on the characteristics of the measuring sensor when measuring the voltage or current of a distribution line using a measuring sensor such as a voltage sensor or a current sensor. The present invention relates to a method and apparatus for phase correction of distribution line measurement values, which relatively corrects the phase shift of the output of the.

[0002]

2. Description of the Related Art The voltage and current of a distribution line are measured, and the power factor calculated based on the measured value is monitored to control the voltage of the distribution line. There are various types of measurement sensors that measure voltage and current, but the cheaper the measurement sensor, the more accurate the voltage or current value becomes, but the input (primary) and output ( A phase shift occurs between the secondary). This phase shift occurs due to the characteristics of the measuring sensor. When calculating the power factor of the distribution line using the output of such a measurement sensor, the ground voltage and line current are used, so the phase shift of the output of the measurement sensor may cause a large error. Become. Therefore, conventionally, the voltage and current of the distribution line have been measured using an expensive measuring sensor that is less likely to cause phase shift.

[0003]

However, recently, a device called a voltage / current / power factor monitoring device for monitoring the voltage and current of the distribution line is arranged along the distribution line at a predetermined distance, and the voltage of the distribution line is reduced. The management of such things is becoming a trial. However, since this device will be arranged in units of one thousand in one power distribution system, using a large and expensive measuring sensor will not only increase the size of the voltage / current / power factor monitoring device, but also However, there is a problem that the price becomes high and the installation cost of the voltage / current / power factor monitoring device becomes enormous.

It is an object of the present invention to provide a method and apparatus for correcting the phase of a measured value of a distribution line, which can easily correct the phase shift of the output of the measuring sensor.

Another object of the present invention is to provide a method and apparatus for correcting the phase of a measured value of a distribution line, which makes it possible to use an inexpensive measuring sensor for a voltage / current / power factor monitoring device or the like. .

Still another object of the present invention is to provide a phase correction device for distribution line measured values which can perform phase correction without trouble even if a power failure occurs in the distribution line.

Another object of the present invention is to provide a phase correction device for distribution line measurement values that can perform phase correction without any trouble even when the measurement sensor is replaced.

[0008]

According to the method of the present invention, the voltage or current of a multi-phase distribution line is measured at a predetermined sampling period by using a plurality of measuring sensors, and the characteristics of the plurality of measuring sensors are measured. The phase correction method of the measured value of the distribution line that corrects the phase shift generated based on The sampling cycle is arbitrary. The number of times of sampling is preferably such that the output of each measuring sensor can be sampled for one cycle.

In the method of the present invention, first, the phase delay amount or the phase lead amount of the output with respect to the reference input signal is obtained in advance for each of the plurality of measuring sensors. As the reference input signal, for example, a sine wave signal having the same phase and the same waveform for a plurality of measuring sensors is used. The phase delay amount or the phase lead amount of the output with respect to the input signal when the reference input signal is input to each measurement sensor may be obtained by any element such as time and electrical angle. When processing is performed using a computer, it is convenient to find the phase delay amount or the phase lead amount in time.

To obtain the ground voltage and the line current, it is sufficient to correct the relative phase shift between the output of one measuring sensor serving as a reference and the output of another measuring sensor.
By doing so, the phase correction is not necessary for the output of one measurement sensor, and the processing time and the memory usage amount can be reduced. Therefore, in the present invention, one of a plurality of measurement sensors is used based on the phase delay amount or the phase lead amount.
The relative phase delay amount or the relative phase lead amount of the outputs of the other measurement sensors based on the output of one measurement sensor is calculated. For example, the output (measurement value) of one measurement sensor
The relative phase delay time or relative phase advance time T of the output (measured value) of the other measuring sensor based on is calculated,
The relative phase delay amount or relative phase advance amount of the output of another measurement sensor can be determined by the quotient n of the calculation result obtained by dividing the calculation time by the sampling period and the remainder ΔT. In this case, the information indicating whether it is delayed or advanced is naturally attached.

In the present invention, the phase correction measurement value is obtained by correcting the phase of the measurement value of the other measurement sensor based on the relative phase delay amount or the relative phase advance amount and the measurement value, and this phase correction is performed. The measured value is used as the output of another measuring sensor. The measurement value of one reference measurement sensor does not require phase correction, and thus the measurement value can be used as it is. Any method of correcting the phase of the measurement value of the other measurement sensor based on the relative phase delay amount or the relative phase advance amount and the measurement value is arbitrary. Specifically, it suffices to shift the measurement values of the corresponding measurement sensors by the relative phase delay amount or the relative phase advance amount. To specifically realize this in the case where the output of the measurement sensor is sampled at a predetermined sampling period and stored in the measurement value storage means, for example,
A reference value is obtained from the measured value of the corresponding measuring sensor stored in the measured value storage means based on the above quotient n, and an interpolated value is calculated based on the above-mentioned remainder ΔT. Then, the value obtained by adding and subtracting the interpolation value to the reference value may be output as the phase-corrected measurement value. When such a method is used, the output of the measurement sensor is simply stored in the measurement value storage means, and thereafter, the measurement value can be relatively accurately determined based on the relative phase delay amount or the relative phase advance amount. The phase can be corrected.

According to the present invention, the measured value storage means for storing the measured values measured by the measuring means for measuring the voltages or currents of the distribution lines of a plurality of phases at a predetermined sampling period using a plurality of measuring sensors, and a plurality of measuring value storage means A phase correction device for the measured value of the distribution line is constituted by the phase correction means for correcting the phase shift of the measured value based on the characteristics of the measuring sensor. Then, the phase correction means includes at least a relative phase delay / advance amount calculation device,
It is composed of a phase correction measurement value calculation means and a phase correction measurement value storage means.

The relative phase delay / advance amount calculation device is one of the plurality of measurement sensors based on the amount of phase delay or the amount of phase advance of the output with respect to the reference input signal measured in advance for the plurality of measurement sensors. The relative phase delay amount or the relative phase lead amount of the output of another measurement sensor based on the output of the measurement sensor is calculated.

A nonvolatile phase delay / advance amount storage means for storing the output phase delay amount or phase advance amount with respect to the reference input signal measured in advance for each measuring sensor may be provided. If such non-volatile phase delay / lead amount storage means is provided, the memory of the phase delay amount or the phase lead amount can be retained even if a power failure occurs in the distribution line. Alternatively, the relative phase lead amount can be calculated. In this case, the relative phase delay / advance amount calculation device calculates and stores the relative phase delay amount or relative phase advance amount of the outputs of the phase delay / advance amount storage means and the second and third measurement sensors. And a relative phase delay / advance amount calculation storage means.

Further, the phase delay / lead amount storage means may be further provided with a stored value writing means for storing the phase delay amount or the phase lead amount. If such a writing means is provided, at least one of the measuring sensors can be used for repair and maintenance work.
When one of them is replaced, the amount of phase delay or the amount of phase lead for the replaced measuring sensor can be easily stored, which improves workability.

The phase-corrected measured value calculation means is based on the relative phase delay amount or relative phase advance amount calculated by the relative phase delay / advance amount calculation device and the measured value stored in the measured value storage means. Calculate the phase correction measurement value of the measurement sensor.

At the level of the embodiment, the relative phase delay / advance amount calculation storage means described above is stored in the phase delay / advance storage means for each of the plurality of measuring sensors. Based on, the relative phase delay time or the relative phase lead time of the output of the other measuring sensor based on the output of one measuring sensor is calculated,
If the relative phase delay amount or the relative phase advance amount of the output of another measurement sensor is determined by the quotient n of the calculation result obtained by dividing the calculation time by the sampling period and the remainder ΔT, The phase correction measurement value calculation means reads out the corresponding reference value from the measurement values stored in the measurement value storage means on the basis of the quotient n determined by the relative phase delay / advance amount determination means, and calculates the interpolated value based on ΔT. It suffices that the calculation is performed and the value obtained by adding or subtracting the interpolation value to the reference value is output as the phase-corrected measurement value.

The calculation result of the phase correction measurement value calculation means is stored in the phase correction measurement value storage means.

[0019]

If there are no phase shifts in the outputs of the three voltage sensors for measuring the three-phase voltages, the U, V, and W voltages can be measured as shown by the solid lines in FIG. However, if the outputs of the three voltage sensors have a phase shift, the detection voltages u, v, and w shown by the dotted lines in FIG. 7 are measured.
If the interphase voltage between u and v is obtained in such a state, an error occurs. Looking at the interphase voltage, if there is a phase shift of 1 degree,
A variation of 0.5% occurs. Such a problem can be solved by correcting the phases of v and w with reference to u, for example.

Therefore, in the present invention, first, the phase delay amount or the phase lead amount of the output with respect to the reference input signal is obtained in advance for each of the plurality of measuring sensors, and the plurality of measurement is performed based on the phase delay amount or the phase lead amount. The relative phase delay amount or the relative phase lead amount of the output of the other measurement sensor based on the output of one of the measurement sensors is calculated. Then, based on the relative phase delay amount or relative phase advance amount and the measurement value, the phase correction measurement value in which the phase of the measurement value of the other measurement sensor is corrected is obtained, and this phase correction measurement value is used for the other measurement sensor. Output. By doing this, the measured value of one reference measuring sensor is
Phase correction is no longer necessary, and the measured values can be used as they are. Therefore, the phase shift of the output of the measuring sensor can be basically corrected simply by calculation, and the inexpensive measuring sensor can be used for the voltage monitoring device or the like.

[0021]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of an embodiment of a phase correction device of the present invention used for measuring voltage or current of a voltage monitoring device for a three-phase distribution line. The main part of this embodiment is realized by using a microcomputer or the like. In FIG. 1, 1 to 3 are measuring sensors in which a phase shift occurs in the output based on the characteristics. As such a measuring sensor, there are a current sensor including a toroidal coil, a Rogowski coil, and a voltage sensor including an instrument transformer including a capacitor instrument transformer. When the measurement sensors 1 to 3 are current sensors, each measurement sensor is arranged along the three-phase distribution line. The outputs of the measurement sensors 1 to 3 are input to an analog-digital converter, that is, an A / D converter 4 and converted from an analog signal to a digital signal.

The output of the A / D converter 4 is sampled by the sampling means 5. The sampling means 5 of this embodiment samples the outputs of the measurement sensors 1 to 32 at 32 points at a sampling cycle of 520.83 μs. In this way, when the voltage of 60 cycles is sampled, the measured value for one cycle can be obtained for each phase. The 32 measured values of each of the measuring sensors 1 to 3 are stored in the measured value storage means 6 in time series. Image-wise, the measured values of one measuring sensor are d (1) and d (32) in 32 memories, respectively.
It can be considered that (2), ... D (32) are stored in the order of sampling.

Reference numeral 7 is a relative phase delay / advance amount calculation device. This relative phase delay / advance amount calculation device is an output phase delay amount with respect to a reference input signal measured in advance for the three measuring sensors 1 to 3, or Based on the phase lead amount, the relative phase delay amount or the relative phase of the outputs of the other measurement sensors 2 and 3 based on the output of one measurement sensor 1 of the three measurement sensors 1 to 3. Calculate the amount of advance. More specifically, for example, the in-phase reference input signals I each having a sine wave are input to the measurement sensors 1 to 3.
The outputs of the measuring sensors 1 to 3 and the reference input signal I1
The phase difference t1 to t3 from .about.13 is measured in advance in time. FIG. 2 shows the relationship between the measurement sensors 1 to 3. In FIG. 2, t1 to t3 are phase shift times when the zero-cross point of the reference input signal I is 0 second, and
Is the relative phase difference. In the relative phase delay / advance amount calculation device 7, when the measurement sensor 1 is used as a reference,
(T1 + t2) = T is calculated to obtain the relative phase difference time T
Ask for. When T ≦ 0, the reference measurement sensor 1
The output of the measuring sensor 2 is relatively delayed with respect to the output of, and T is a relative phase delay amount expressed in time. When T> 0, the output of the measurement sensor 2 is relatively advanced with respect to the output of the reference measurement sensor 1, and T is the relative advance amount expressed in time.

In the present embodiment, the relative phase delay / advance amount calculation device 7 is composed of a nonvolatile phase delay / advance amount storage means 8 such as an EEROM and a relative phase delay / advance amount calculation storage means 9. is doing. Therefore, the phase delay / lead amount storage means 8 stores the amount of phase delay or the amount of phase lead (t1 to t3) of the output with respect to the reference input signal I measured in advance for the measuring sensors 1 to 3. Then, in the relative phase delay / advance amount calculation storage means 9, the phase delay amount or phase advance amount (t1 to t3) for each of the measuring sensors 1 to 3 stored in the phase delay / advance amount storage means 7.
Based on the above, the relative phase delay amount or the relative phase lead amount of the outputs of the measurement sensors 2 and 3 based on the output of the measurement sensor 1 is calculated and stored. The relative phase delay amount or the relative phase advance amount is calculated by the phase correction measurement value calculation means 1 described later.
Depending on the mode or method of calculation in 1,
It can be expressed in any form such as an angle or a numerical value. In this embodiment, the relative phase delay time or the relative phase lead time T of the outputs (measurement values) of the other measurement sensors 2 and 3 based on the output (measurement value) of one measurement sensor 1 is sampled. The relative phase delay amount or relative phase advance amount of the output of the other measurement sensor is determined by the quotient n of the calculation result divided by the cycle (520.83 μs), the remainder ΔT, and the delay or advance information.

The phase correction measurement value calculation means 11 calculates the relative phase delay amount or the relative phase advance amount T calculated by the relative phase delay / advance amount calculation device 7 and the measurement value stored in the measurement value storage means 6. Based on this, the phase correction measurement values of the other measurement sensors 2 and 3 are calculated. The calculation here is a calculation for advancing or delaying the phase of the measurement values of the measurement sensors 2 and 3 by the relative phase delay amount or the relative phase advance amount T, and the calculation method or method is arbitrary. is there. For example, when the measured value is considered as a waveform, if the relative phase delay amount is T seconds, the measured value waveform may be advanced by T seconds, and if the relative phase advance amount is T seconds, the measured value may be measured. The value waveform may be delayed by T seconds. In the present embodiment, since the measured value is the sampling value, the waveform is advanced or delayed by T seconds as follows. That is, as described above, the quotient n of the calculation result obtained by dividing the relative phase delay time or the relative phase advance time T of the measurement values of the measurement sensors 2 and 3 by the sampling period (520.83 μs) and the remainder ΔT and delay or advance. And the information (judgment bit) of the above. In particular,
Since the sampling values of one measuring sensor are stored in 32 memories in the order of sampling as d (1), d (2), ... d (32), the phase shift is based on the 32 measured values. Perform the correction calculation of. In this case, the memory N in which the measured value serving as the reference value for the phase correction calculation is stored is specified based on the quotient n. For example, when the relative phase lead amount (T ≧ 0) is calculated, N = 32−
A memory N in which a reference value for calculation is stored is obtained based on the equation [(31 + n) MOD32]. When the relative phase delay amount (T <0) is calculated, N = [(1
+ N) MOD32] +1 is used to obtain the memory N in which the reference value for the operation is stored. Where "MOD" is
It means the remainder operation, and (31 + n) MOD32 is (3
1 + n) means the remainder when divided by 32.

When the remainder ΔT is zero, that is, when the relative phase delay amount or advance amount is a positive multiple of the sampling period, the value of the Nth memory is set to be the first measured value of sampling. The correction of the phase shift is completed only by performing the rearrangement calculation.

When there is a remainder ΔT, it is not enough to rearrange the values of the Nth memory so as to be the first measured values of sampling, and the measured values corresponding to the remainder ΔT are interpolated by the interpolation method. I do. In the interpolation method, when the Nth measurement value is set as the first measurement value, the difference between the two measurement values stored in the corresponding memory and the memory adjacent in time series is calculated as 52
The interpolated value is obtained by multiplying the value divided by 0.83 μs by ΔT.
This interpolated value is added / subtracted to / from the measured value in the corresponding memory to obtain a phase-corrected measured value. This calculation is performed for all the sampling values of 32 points.

In this way, the phase correction measurement value calculation means 1
The phase correction measurement value obtained by performing the phase correction calculation of the measurement values of the measurement sensors 2 and 3 by 1 is the phase correction measurement value storage means 1
Stored in 2. Since the measurement value of the measurement sensor 1 is not phase-corrected, the measurement value stored in the measurement value storage means 6 can be used as it is, but the measurement sensor stored in the measurement value storage means 6 is used. The measurement value of 1 may be shifted to the phase correction measurement value storage means 12.

In the present embodiment, the phase delay / lead amount storage means 8 is provided with a stored value writing means 10 for storing the phase delay amount or the phase lead amount. Therefore, when at least one of the measurement sensors 1 to 3 is replaced in the repair and maintenance work, the phase delay amount or the phase lead amount of the replaced measurement sensor can be easily stored, and the workability is improved. Get better. Further, in this embodiment, since the phase delay / advance amount storage means 8 is composed of a non-volatile memory, even if a power failure occurs in the distribution line, the storage of the phase delay amount or the phase advance amount can be held. The relative phase delay amount or the relative phase advance amount can be calculated immediately after power restoration.

When the device of this embodiment is mounted on the voltage / current / power factor monitoring device, the phase measured beforehand by the measuring sensor mounted on the phase lag / lead amount storage means 8 when the device is shipped. The amount of delay or the amount of advance is stored.

FIG. 3 shows an example of a software algorithm used when the present embodiment is implemented by using a computer. Further, FIG. 4 shows step ST3 of FIG.
Shows the details of. In step ST11, the relative phase difference T is obtained by time, and in step ST12, it is determined whether the relative phase difference T is the relative phase delay amount or the relative phase advance amount. When T <0 and the relative phase lead amount is present, the phase needs to be delayed by the relative phase lead amount in the phase correction, so that is displayed in step ST13, and step S13 is performed.
At T14, the absolute value T is divided by 520.83 of the sampling period to obtain the quotient n and a little ΔT, and at step ST15, the measured value corrected to the first measured value by the phase correction based on the quotient n is stored in the memory. Obtain the memory number N. Steps ST13 'to ST15' are steps for the relative phase lead amount. Then, in step ST16, the relative phase delay amount or the relative phase advance amount is stored as a table using the judgment bit indicating the delay / advance, N and ΔT. If the table is stored in this way, the relative phase delay amount or the relative phase advance amount does not have to be calculated each time, and the overall calculation speed is increased. Note that step ST1
It goes without saying that the result of 1 may be stored as it is and the steps ST12 to ST16 may be executed by the phase correction measurement value calculation means 11.

5 and 6 show the details of the flow chart for executing the calculation in step ST4 of FIG. The flow chart of FIG. 5 is a flow chart in the case where the calculation result of the relative phase delay / advance amount calculation device 7 is the relative phase advance amount and the phase correction for advancing the phase of the measured value is performed, and the flow chart of FIG. 6 is a flowchart in the case where the calculation result of the relative phase delay / advance amount calculation device 7 is a relative phase delay amount and a phase correction for delaying the phase of the measured value is performed. In step 405, 32 assigned to one measurement memory of the measurement value storage means 6 is assigned.
The value of the Nth memory of each memory is used as a reference value for the calculation of the first measurement value, the interpolation value is calculated based on the remainder ΔT, and the phase correction measurement value Hi is obtained. In this step, the phase correction measurement values H1, H2 ... Are calculated in order. Then, in step ST412, the phase-corrected measured value is sequentially stored in the 32 memories allocated to one measuring sensor of the phase-corrected measured value storage means 12. The other steps are for enabling the phase correction for all the sampling values (measurement values) of 32 points of one measuring sensor.

The flowchart of FIG. 6 is a flowchart in the case where the calculation result of the relative phase delay / advance amount calculation device 7 is the relative phase delay amount and the phase correction for delaying the phase of the measured value is performed. 5 is the same as the flowchart in FIG. 5 except that the formula in ST405 ′ is different from the formula in step ST405 in FIG.

The phase correction measurement value calculation means 11 selects one of the flowcharts of FIGS. 5 and 6 and executes the calculation according to the judgment bit stored in step ST16 of FIG. The phase correction measurement value calculation means 11 executes correction calculation for all the measurement sensors 2 and 3 other than the reference measurement sensor 1.

Although the above embodiment is an embodiment in which digital processing is performed by using a computer, it goes without saying that the present invention may be realized by a digital circuit without using a computer.

[0036]

According to the present invention, the measurement value of one reference measurement sensor does not require phase correction, and the measurement value can be used as it is, and the relative measurement output of the measurement sensor can be used. Since the phase shift can be basically corrected simply by calculation, an inexpensive measuring sensor can be used for a voltage / current / power factor monitoring device or the like.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of an embodiment of a phase correction device of the present invention used for measuring voltage or current of a voltage monitoring device for a three-phase distribution line.

FIG. 2 is a waveform diagram used to explain a relationship between phase shifts of two measuring sensors.

FIG. 3 is a flowchart showing an example of a software algorithm used when the present embodiment is implemented using a computer.

FIG. 4 is a flowchart showing details of step ST3 in FIG.

5 is a flowchart showing details of part of step ST4 of FIG. 3. FIG.

FIG. 6 is a flowchart showing details of a part of step ST4 of FIG.

FIG. 7 is a vector diagram used to describe a case where outputs of three measuring sensors have a phase shift.

[Explanation of symbols]

1-3 measuring sensor 4 A / D converter 5 Sampling means 6 Measured value storage means 7 Relative phase delay / lead amount calculator 8 Phase delay / lead amount storage means 9 Relative phase delay / lead amount calculation storage means 10 Memorized value writing means 11 Phase correction measurement value calculation means 12 Phase correction measurement value storage means

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroyuki Kamizono 2-82 Watanabe-dori, Chuo-ku, Fukuoka City, Fukuoka Prefecture Kyushu Electric Power Co., Inc. 2150 1 Kyushu Transformer Co., Ltd. (72) Inventor Hideki Doi, Shioido, Fukuma-cho, Munakata-gun, Fukuoka Prefecture 1 2150 1 Kyushu Transformer Co. (72) Inventor, Katsuhisa Asakami Fukuma-cho, Munakata-gun, Fukuoka 2150 Shioido, 1 Kyushu Transformer Co., Ltd. (72) Inventor Atsushi Fukushima, Fukuma-cho, Munakata-gun, Fukuoka Character 1 2150 Shioido, Kyushu Transformer Co., Ltd. (72) Kazuhiro Furukawa, Munakata-gun, Fukuoka Prefecture 1150, 2150 Shioido, Fukuma-cho 1 Kyushu Transformer Co., Ltd. (72) Inventor Miya ▲ Saki ▼ Tsuneo 2-20-1 Koseidori, Nishi-ku, Nagoya, Aichi Prefecture Meitec Co., Ltd. ( 56) References JP-A-6-249888 (JP, A) JP-A-6-242158 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G01R 19 / 00-19 / 32 G01R 21/00-21/14

Claims (5)

(57) [Claims] 1. A measurement value obtained by measuring the voltage or current of a multi-phase distribution line with a plurality of measuring sensors at a predetermined sampling period and a phase shift generated based on the characteristics of the plurality of measuring sensors. A method of correcting the phase of a distribution line measurement value to be corrected, in which the phase delay amount or the phase lead amount of the output with respect to the reference input signal is obtained in advance for each of the plurality of measurement sensors, and the phase delay amount or the phase lead amount is obtained. Calculating the relative phase delay amount or the relative phase advance amount of the output of the other measurement sensor based on the output of one measurement sensor of the plurality of measurement sensors, Amount or relative phase lead amount and the measured value to obtain a phase-corrected measured value in which the phase of the measured value of the other measured sensor is corrected, and the phase-corrected measured value is used as the other measured sensor. A method for correcting the phase of a measured value of a distribution line, which is characterized in that 2. A measurement value storage unit that stores a measurement value measured by a measurement unit that measures the voltage or current of a multi-phase distribution line using a plurality of measurement sensors at a predetermined sampling period, and the plurality of measurements. And a phase correction means for correcting the phase shift of the measured value based on the variation in the characteristics of the sensor, the phase correction means, the phase of the output to the reference input signal measured in advance for the plurality of measurement sensors On the basis of the delay amount or the phase lead amount, the relative phase delay amount or the relative phase lead amount of the output of the other measuring sensor based on the output of one of the plurality of measuring sensors is used as a reference. A relative phase delay / advance amount calculation device for calculating, and the relative phase delay amount or relative phase advance amount calculated by the relative phase delay / advance amount calculation device and the measured value storage unit. Phase correction measurement value calculation means for calculating the phase correction measurement value of the other measurement sensor based on the measurement value stored in the stage, and phase correction measurement value for storing the calculation result of the phase correction measurement value calculation means A phase correction device for a measured value of a distribution line, comprising a storage means. 3. A measurement value storage means for storing a measurement value measured by a measurement means for measuring the voltage or current of a three-phase distribution line by using the first to third measurement sensors at a predetermined sampling period, Phase correction means for correcting the phase shift of the measurement value based on the characteristics of the first to third measurement sensors, the phase correction means preliminarily in regard to the first to third measurement sensors. Non-volatile phase delay / advance amount storage means for storing an output phase delay amount or phase advance amount with respect to the measured reference input signal, and the first to third measurement objects stored in the phase delay / advance amount storage means Based on the phase delay amount or the phase advance amount for each of the sensors, the relative phase delay amount or the relative phase delay amount of the outputs of the second and third measurement sensors with reference to the output of the first measurement sensor. Phase lead Relative phase delay / advance amount calculation storage means for calculating and storing the amount, and relative phase delay amount or relative phase advance amount and the measured value storage stored in the relative phase delay / advance amount calculation storage means A phase correction measurement value calculation means for calculating phase correction measurement values of the second and third measurement sensors based on the measurement value stored in the means; and a calculation result of the phase correction measurement value calculation means. A phase correction device for a measured value of a distribution line, comprising: a phase correction measured value storage means. 4. The phase correction device for a measured value of a distribution line according to claim 3, further comprising storage value writing means for storing the phase delay amount or the phase lead amount in the phase delay / lead amount storage means. 5. A measurement value storage means for storing the measurement value measured by the measurement means for measuring the voltage or current of the three-phase distribution line using the first to third measurement sensors at a predetermined sampling period, Phase correction means for correcting the phase shift of the measurement value based on the characteristics of the first to third measurement sensors, the phase correction means preliminarily in regard to the first to third measurement sensors. A non-volatile phase delay / advance amount storage means for storing an output phase delay amount or phase advance amount with respect to the measured reference input signal as a phase delay time or phase advance time; Based on the phase delay time or the phase lead time for each of the first to third measurement sensors, the output of the second and third measurement sensors based on the output of the first measurement sensor Relative phase delay time or relative phase lead time is calculated, and the second and third are calculated by the quotient n and the remainder ΔT of the calculation result obtained by dividing the calculation time by the sampling period.
Relative phase delay / advance amount calculation storage means for determining the relative phase delay amount or relative phase advance amount of the output of the measurement sensor, and the relative phase delay / advance amount calculation storage means stored in the relative phase delay / advance amount calculation storage means. Phase correction measurement value calculation means for calculating phase correction measurement values of the second and third measurement sensors based on the phase delay amount or relative phase advance amount and the measurement value stored in the measurement value storage means. A phase correction measurement value storage means for storing a calculation result of the phase correction measurement value calculation means, wherein the phase correction measurement value calculation means is provided for the relative phase delay /
A corresponding reference value is read from the measured value stored in the measured value storage means based on the quotient n determined by the advance amount determination means, an interpolation value is calculated based on the ΔT, and the interpolation is performed based on the reference value. A phase correction device for a distribution line measured value, which is configured to output a value obtained by adding or subtracting a value as the phase-corrected measured value.