Measurement system and method for insulated connections, and sensor for power system monitoring.

Abstract

To acquire voltage and vibration values ​​at an insulated connection point using a single sensor. [Solution] A measurement system A incorporated into an insulating connection section B used in an extra-high voltage line or a high voltage line, comprising at least a sensor 10 consisting of at least one object to be measured 11 connected in series with the insulating connection section B, wherein the object to be measured 11 is made of a dielectric material and a piezoelectric material, and a calculation unit 20 that acquires the internal voltage value and vibration value of the insulating connection section B from the voltage waveform of at least one of the objects to be measured 11 constituting the sensor 10.

Description

Technical Field

[0001] The present invention relates to a measurement system and a measurement method for obtaining vibration values of an insulating connection part used in a special high-voltage line or a high-voltage line, and a sensor for power system monitoring.

Background Art

[0002] The following Patent Document 1 discloses a method of observing a vibration waveform from a partial discharge waveform detection device connected via an insulating connection part and a lead wire as a method of calibrating a position where partial discharge occurs in a line of a power cable.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] One object of the present invention is to provide means capable of obtaining voltage values and vibration values of an insulating connection part by a method different from the prior art.

Means for Solving the Problems

[0005] The present invention made to solve the above problems is a measurement system incorporated in an insulating connection part used in a special high-voltage line or a high-voltage line, comprising at least one measurement object connected in series with the insulating connection part, the measurement object being made of a dielectric material and a piezoelectric material, a sensor, and an arithmetic unit for obtaining an internal voltage value and a vibration value of the insulating connection part from a voltage waveform of at least one of the measurement objects constituting the sensor. Furthermore, the present invention may also be configured such that the calculation unit separates a vibration waveform from the voltage waveform of at least one of the objects to be measured that constitutes the sensor, and calculates a vibration value from the vibration waveform. Furthermore, the present invention can also be configured to calculate the internal voltage value of the insulating connection portion by multiplying the voltage value obtained from the voltage waveform after separating the vibration waveform by a coefficient assigned to at least each configuration of the sensor. Furthermore, the present invention may also be configured such that the insulating connection portion comprises at least an insulator, a shielding electrode, an internal electrode, and an insulating plug, and the object to be measured is connected in series with the insulating plug. Furthermore, the present invention provides a method for acquiring internal voltage and vibration values ​​of an insulated connection portion used in an extra-high voltage line or a high voltage line using an information processing device, characterized in that a sensor consisting of at least one object to be measured made of a dielectric material and a piezoelectric material is connected in series with the insulated connection portion, the information processing device separates a vibration waveform from the voltage waveform of at least one object to be measured that constitutes the sensor, and calculates a vibration value from the vibration waveform. Furthermore, the present invention may also be configured so that the information processing device calculates an internal voltage value of the insulated connection portion by multiplying the voltage value obtained from the voltage waveform after separating the vibration waveform by a coefficient assigned to at least each configuration of the sensor. Furthermore, the present invention may also be configured such that the insulating connection portion comprises at least an insulator, a shielding electrode, an internal electrode, and an insulating plug, and the object to be measured is connected in series with the insulating plug. Furthermore, the present invention relates to a power system monitoring sensor that can be attached to a component of a power system to measure voltage and vibration values, characterized in that the sensor is made of a dielectric material having a piezoelectric effect. [Effects of the Invention]

[0006] According to the present invention, voltage and vibration values ​​of an insulated connection can be acquired with a single sensor. [Brief explanation of the drawing]

[0007] [Figure 1] A basic configuration diagram of the measurement system according to the present invention. [Figure 2] A diagram illustrating the separation of voltage waveforms. [Figure 3] A schematic diagram showing the overall configuration of the measurement system according to Example 2. [Modes for carrying out the invention]

[0008] Hereinafter, embodiments of the present invention will be described with reference to the drawings. [Examples]

[0009] <1> Basic configuration (Figure 1) The measurement system A according to the present invention is a system for acquiring the internal voltage value and vibration value of an insulated connection part B, and comprises at least a sensor 10 and a calculation unit 20. The following describes the details of each part and an example of the calculation method.

[0010] <2> Insulated connection (Figure 1) Insulated connection part B is a component that connects to power cables and power equipment. In the present invention, the type of insulating connection part B is not particularly limited, but it includes terminal connection parts and intermediate connection parts used in extra-high voltage lines or high voltage lines.

[0011] <3> Sensor (Figure 1) Sensor 10 is the part of the body that is measured for voltage and vibration values ​​by the voltmeter 30. The sensor 10 can consist of at least one object to be measured 11 that forms a series circuit by being connected in series with an insulating connection part B, or more specifically, with an insulating member (insulating part B2) that constitutes the insulating connection part B. With the above configuration, the sensor 10 generates voltages that are divided by the internal voltage of the insulated connection part B (voltage applied to the internal electrodes in the insulated connection part B), and also generates voltage due to the piezoelectric effect when vibration occurs. In this invention, the object to be measured 11 is made of a material that is both a dielectric material and a piezoelectric material (a dielectric material having a piezoelectric effect), and it is preferable that the total capacitance of at least one object to be measured 11 whose voltage value is to be measured is greater than the capacitance of the insulator connected in series. In this case, even if a material with a low dielectric constant is used as the object to be measured 11, it is sufficient that the total capacitance of the objects to be measured 11, which are the objects whose voltage values ​​are to be measured, becomes greater than the capacitance of the insulator by connecting multiple objects to be measured 11 in series.

[0012] <3.1> Types of objects to be measured In this invention, the type of object to be measured 11 is not particularly limited and can be a dielectric material that exhibits a piezoelectric effect, such as quartz, barium titanate (BaTiO3), lead titanate (PbTiO3), lead zirconate (PbZrO3), lead titanate-lead zirconate (PZT), or bismuth titanate (Bi4Ti3O3). 12 ), polyvinylidene fluoride (PVDF), topaz (Al2SiO4(F,OH)2), tourmaline, zinc oxide (ZnO), aluminum nitride (AlN), lithium niobate (LiNbO3), potassium niobate (KNbO3), Rochelle salt (KNaC4H4O6·4H2O), zirconium phosphate (ZrPO4), lithium tantalate (LiTaO3), bismuth sulfate (Bi2(SO4)3), indium oxide (In2O3), etc. can be used.

[0013] <3.2> Regarding the measured values ​​of the object being measured The number and types of objects 11 to be measured for voltage value measurement are preferably designed so that the measured voltage value is below the safety voltage, i.e., 50V or less, more preferably 25V or less. For example, the more series connections there are of the elements to be measured 11, the lower the voltage value of the elements to be measured 11 becomes. Also, the higher the dielectric constant of the dielectric material used as the elements to be measured 11, the lower the voltage value generated at the elements to be measured 11 becomes. In this invention, the number and type of each material constituting the elements to be measured 11 can be appropriately designed based on the above effects and the planned internal voltage of the insulating connection part B.

[0014] <3.3> Mounting method of the sensor The sensor 10 can adopt various configurations, such as a configuration integrally formed in advance with an insulating portion B2 which is a component of the insulating connection portion B, or a configuration detachable from the insulating portion B2.

[0015] <4> Calculation unit (Fig. 1) The calculation unit 20 is a device for executing a process of separating a vibration waveform from a voltage waveform of at least one measurement object 11 to be measured by a voltmeter 30 (hereinafter also referred to as "measurement waveform"), calculating a voltage value from the voltage waveform after separating the vibration waveform (hereinafter also referred to as "voltage waveform after separation"), and calculating a vibration value from the vibration waveform. In the present invention, various methods can be adopted for the process of separating the vibration waveform from the voltage waveform measured by the voltmeter 30. For example, fast Fourier transform (FFT), short-time Fourier transform (STFT), wavelet transform, calibration, etc. can be mentioned. The calculation unit 20 can use an information processing device C that acquires the voltage waveform measured by the voltmeter 30 by an arbitrary method (automatically or manually). As the information processing device C, an application installed in a general-purpose information processing terminal such as a PC, tablet, smartphone, etc., or a dedicated embedded device in which a calculation program is incorporated into a microcomputer, etc. can be used.

[0016] <4.1> Separation image of each waveform (Fig. 2) Fig. 2 shows an image diagram of separating a vibration waveform from the voltage waveform measured by the voltmeter 30. The measurement waveform 31 measured by the voltmeter 30 is separated by the calculation unit 20 into a vibration waveform 311 and a voltage waveform 312 after separation. Then, the vibration waveform 311 is used for the calculation process of the vibration value, and the voltage waveform 312 after separation is used for the calculation process of the voltage value. Details of each calculation process will be described in <4.2> and <4.3> described later.

[0017] <4.2> Calculation process of vibration value (Fig. 2) In the present invention, various methods can be employed for the process of calculating vibration values ​​from vibration waveforms 311. Examples include simply measuring the peak value of the amplitude, calculating the effective value (RMS value), performing frequency analysis such as fast Fourier transform (FFT), and performing time-domain analysis.

[0018] <4.3> Voltage Value Calculation Process (Figure 2) In the present invention, various methods can be employed for the process of calculating the voltage value from the separated voltage waveform 312. For example, the calculation unit 20 may further have a function to calculate the internal voltage of the insulated connection part B by multiplying the effective value of the separated voltage waveform 312 by a predetermined coefficient. This coefficient is configured to be assigned to each value of the voltage applied to the internal electrodes and to each configuration of the sensor 10 (such as the number and type of objects to be measured 11). For example, Table 1 below shows an example of a table of coefficient assignments for each planned voltage applied to the internal electrode when a perovskite-type oxide is used as the object 11 to be measured for voltage value measurement.

[0019] [Table 1] JPEG2026114505000002.jpg34151

[0020] This allocation table can be prepared by creating a test specimen of this system, performing a voltage divider test on this specimen, and then calculating a coefficient by dividing the voltage value of the dielectric being measured by the actual applied voltage value, and appropriately adding this to a database.

[0021] <5> summary According to the measurement system A of the present invention, at least one of the effects described below can be obtained. (1) By using a material that is both a dielectric material and a piezoelectric material as the object to be measured 11, voltage and vibration values ​​can be measured simultaneously with a single sensor 10, eliminating the need to prepare separate sensors 10. (2) The internal voltage can be determined while the insulated connection B remains live. (3) Unlike the case where detectors are attached to power cables or grounding wires for monitoring, it is possible to monitor the voltage at each insulated connection point B, so fault detection can be performed on a phase-by-phase basis rather than detecting all three phases at once. (4) The device is designed so that the voltage value of the object to be measured, 11, is 50V or less, so that the measurement work can be performed while ensuring the safety of the workers. (5) Since the voltage fluctuation of the object to be measured 11 is linked to the fluctuation of the internal voltage of the insulated connection part B, it can also be used for voltage monitoring purposes. (6) By using the inverse conversion of vibration measurement and selecting the components of the sensor 10 so that vibration occurs when an abnormal voltage occurs, it can be used for voltage monitoring purposes by simply monitoring the presence or absence of vibration without calculating the voltage value. [Examples]

[0022] <1> Overall structure This section describes an example configuration in the measurement system A according to the present invention, where a terminal connection is selected as the insulating connection B.

[0023] <2> Termination connection The insulating connection part B shown in Figure 3 comprises at least an insulator 40 constituting the insulating portion of the main material of the insulating connection part B, a shielding electrode 50 provided on the outer surface of the insulator 40, an internal electrode 60 arranged inside the insulator 40, and an insulating plug 80 that can be inserted into the open opening 41 of the insulator 40. In this embodiment, at least the internal electrode 60 corresponds to the energized section B1 in Figure 1, and the insulating plug 80 corresponds to the insulating section B2. More specifically, in the embodiment shown in Figure 3, the internal electrode 60A, the internal electrode 60B, the connecting conductor 90, the conductor of the power cable (not shown), and the high-voltage side conductor 82 at the tip of the insulating plug 80 correspond to the energized section B1 in Figure 1, and the main body 81 of the insulating plug 80 corresponds to the insulating section B2. The following describes the details of each component and part.

[0024] <2.1> Insulator (Figure 3) The insulator 40 constitutes the insulating portion of the main body material of the insulating connection part B and is a component for insulating the internal electrode 60, which will be described later, from the outside. In the present invention, the shape, structure, etc. of the insulator 40 are not particularly limited. The insulator 40 can be made of a rigid plastic resin material with high mechanical strength (for example, epoxy resin or fiber-reinforced plastics (FRP)).

[0025] <2.1.1> Open opening (Figure 3) The opening 41 is a portion formed to connect the inside and outside of the insulator 40. In this invention, the position, shape, etc., of the opening 41 are not particularly limited. In this embodiment (Figure 3), an opening 41 is provided on the right side of the paper of the insulator 40. Under normal circumstances (when the power cable (not shown) connected to the insulated connection part B is energized), an insulating plug 80 is fitted to the opening 41, and during the withstand pressure test, an energizing cable (not shown) is connected to it.

[0026] <2.2> Shielding electrode (Figure 3) The shielding electrode 50 constitutes the shielding layer of the main body material of the insulating connection part B and is a component that prevents leakage of current from the internal electrode 60 provided on the insulator 40 to the outside. The shielding electrode 50 can be composed of a conductive member provided on the outer surface of the insulator 40, or a conductive paint applied to the outer surface of the insulator.

[0027] <2.3> Internal electrodes (Figure 3) The internal electrode 60 constitutes the high-voltage electrode of the main body material of the insulating connection part B, and is placed inside the insulator 40 to conduct electricity between the power cable (not shown) and power equipment connected to the insulating connection part B. The internal electrode 60 can be made of a conductive material suitable for current conduction, such as copper, aluminum, a copper alloy, or an aluminum alloy, or semiconducting rubber. The internal electrodes 60 (60A and 60B in the embodiment shown in Figure 3) and the insulator 40 that constitute the main body material of the insulating connection part B are integrally formed by mold molding. Figure 3 shows an internal electrode 60 which has an internal electrode 60A that is electrically connected to the equipment located on the left side of the paper, and an internal electrode 60B that is electrically connected to a power cable (not shown) connected from the bottom of the paper. The internal electrode 60A and the internal electrode 60B are electrically connected via a connecting conductor 90 which is placed in a cavity 41 inside the insulator 40. In the embodiment shown in Figure 3, the high-voltage electrode of the main body material of the insulating connection part B is described as being electrically connected by a connecting conductor 90 between an internal conductor 60A and an internal conductor 60B. However, an internal electrode made of a single component (for example, a structure like the internal conductor 11 in Japanese Patent No. 7494255) may also be used.

[0028] <2.4> Insulating plug (Figure 3) The insulating plug 80 is a component for closing the open port 41. In the present invention, the shape, structure, material, etc. of the insulating plug 80 are not particularly limited, and any form can be selected from known shapes, structures, materials, etc. The insulating plug 80 according to this embodiment has a shape and structure that allows it to be inserted into and fitted into the opening 41 of a T-shaped terminal connector (also called a "T-shaped terminal connector"), and has a main body 81 made of insulating material, a high-voltage side conductor 82 provided on the tip side of the main body 81, and a shielding side conductor 83 provided on the rear end side of the main body 81. After the insulating plug 80 is fitted into the open port 41, the high-voltage side conductor 82 has a structure that electrically connects to the internal electrode 60B. In the case of a T-shaped terminal connection as in the embodiment, the main body 81 of the insulating plug 80 is made of rubber such as ethylene-propylene rubber or silicone rubber. However, in the case of a rubber connector that has a T-shape, the part corresponding to the insulator 40 (the insulating part on the side into which the insulating plug 80 is inserted) is made of rubber, so in this case the main body 81 of the insulating plug 80 is made of epoxy resin or the like. In this embodiment, the high-voltage side conductor 82 is provided with a spring (not shown in the reference numerals) at the rear end of the shielding side conductor 83 to press the main body 81 of the insulating plug 80 against the inner surface of the insulator of the opening 41 while applying surface pressure. In the configuration shown in Figure 3, multiple springs are provided, but one spring may suffice if surface pressure is applied between the insulator 40 and the main body 81, or a configuration without springs may be used if the conformability of the insulator 40 is sufficient.

[0029] <3> Example of connecting a sensor and an insulating plug In this embodiment, the method of connecting the insulating plug 80, which corresponds to the insulating part B2, and the sensor 10 in series is not particularly limited. For example, a method of bringing the object to be measured 11 into contact with the insulating plug 80, or a method of separately wiring the insulating plug 80 and the object to be measured 11 in series can be employed. Furthermore, the sensor 10 can be configured in various ways, such as being pre-integrated with the insulating plug 80, or being detachable from the insulating plug 80. For example, if the sensor 10 is pre-integrated into the insulating plug 80, the function of measuring internal voltage and vibration values ​​at the insulating connection B can be added simply by replacing the conventional insulating plug with an insulating plug 80 that has a structure that allows the sensor 10 to be connected in series at the existing insulating connection B. Furthermore, by making the sensor 10 detachable from the insulating plug 80, it is possible to reuse the insulating plug 80 used in the existing insulating connection part B while adding the function of measuring internal voltage and vibration to the insulating connection part B.

[0030] <4> summary According to the measurement system A of this embodiment, the internal voltage and vibration value of the terminal connection can be acquired simultaneously with a single sensor 10. [Examples]

[0031] In the present invention, the sensor 10 according to the above-described embodiments 1 and 2 can be attached to a component of a power system and used as a component (power system monitoring sensor) capable of monitoring whether or not there is an abnormality in the power system by measuring the voltage value and vibration value at the attachment point. The power system monitoring sensor according to the present invention is advantageous because, by using a dielectric material with a piezoelectric effect, it is possible to simultaneously measure voltage and vibration values ​​with a single sensor, eliminating the need to prepare separate sensors. [Examples]

[0032] In the above-described embodiments 1 to 3, the configuration is such that the voltage value and vibration value measured by the sensor 10 are acquired. However, in the present invention, the configuration may be such that only the vibration value is acquired by the sensor 10. [Explanation of Symbols]

[0033] A: Measurement system B: Insulated connection B1: Power charging department B2: Insulation part C: Information Processing Device 10: Sensor 11: Object being measured 20: Arithmetic section 30: Voltmeter 40: Insulator 41: Open mouth 50: Shielding electrode 60: Internal electrode 80: Insulating plug 81: Main body 82: High-voltage side conductor 83: Shielding side conductor 90: Connecting conductor

Claims

1. A measurement system incorporated into an insulated connection used in extra-high voltage lines or high-voltage lines, A sensor comprising at least one object to be measured connected in series with the aforementioned insulating connection portion, wherein the object to be measured is made of a dielectric material and a piezoelectric material, A calculation unit that acquires the internal voltage value and vibration value of the insulated connection part from the voltage waveform of at least one of the objects to be measured that constitutes the sensor, Characterized by comprising at least the following: Measurement system for insulated connections.

2. The aforementioned calculation unit, The method is characterized by separating the vibration waveform from the voltage waveform of at least one of the objects to be measured that constitutes the sensor, and calculating the vibration value from the vibration waveform. The measurement system for an insulating connection part according to claim 1.

3. The method is characterized by calculating the internal voltage value of the insulating connection portion by multiplying the voltage value obtained from the voltage waveform after separating the vibration waveform by a coefficient assigned to at least each component of the sensor. The measurement system for an insulating connection part according to claim 2.

4. The insulating connection portion comprises at least an insulator, a shielding electrode, an internal electrode, and an insulating plug. The object to be measured is characterized by being connected in series with the insulating plug. The measurement system for an insulating connection part according to claim 1.

5. A method for obtaining internal voltage and vibration values ​​of an insulated connection used in an extra-high voltage line or a high voltage line using an information processing device, A sensor consisting of at least one object to be measured, which is composed of a dielectric material and a piezoelectric material, is connected in series to the insulating connection section. The aforementioned information processing device The vibration waveform is separated from the voltage waveform of at least one of the objects being measured that constitutes the sensor. The method is characterized by calculating vibration values ​​from the vibration waveform. Measurement method for insulated connections.

6. The aforementioned information processing device The method is characterized by calculating the internal voltage value of the insulating connection portion by multiplying the voltage value obtained from the voltage waveform after separating the vibration waveform by a coefficient assigned to at least each component of the sensor. The method for measuring an insulating connection portion according to claim 5.

7. The insulating connection portion comprises at least an insulator, a shielding electrode, an internal electrode, and an insulating plug. The object to be measured is characterized by being connected in series with the insulating plug. The method for measuring an insulating connection portion according to claim 5.

8. A power system monitoring sensor that can be attached to a component of a power system to measure voltage and vibration values, The sensor is characterized by being composed of a dielectric material having a piezoelectric effect. Sensor for monitoring power systems.

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