Internal voltage measurement system and method for insulated connections for extra-high voltage lines or high voltage lines, and insulating plug for insulated connections

Abstract

To provide a means for more easily determining the internal voltage of an insulated connection used in extra-high voltage lines or high-voltage lines. [Solution] A system for measuring the internal voltage of an insulating connection 10 used in extra-high voltage lines or high voltage lines, which is provided with at least an insulator 11, a shielding electrode 12, an internal electrode 13, an open port 14, and an insulating plug 15, comprising at least a unit to be measured 20 consisting of one or more dielectrics connected in series with the insulating plug 15, a voltmeter 30 capable of measuring the voltage value of any one of the one or more dielectrics, and a calculation unit 40 that calculates the internal voltage of the insulating connection 10 by multiplying the voltage value of the dielectric to be measured by a coefficient assigned to at least each component of the unit to be measured 20.

Description

Technical Field

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[0001] The present invention relates to an internal voltage measurement system and method for a special high-voltage line or an insulating connection part for a high-voltage line, and an insulating plug for an insulating connection part.

Background Art

[0002] To measure the internal voltage of an insulating connection part used in a special high-voltage line or a high-voltage line, it is necessary to bring a measurement system such as a voltage divider or a high-voltage probe to the site and perform the measurement work with the line stopped. In addition, it is necessary to transform the voltage to a level that can be measured by a wattmeter using a VCT (instrument transformer), resulting in a large-scale facility, etc.

[0003] In addition, as a means for measuring the internal voltage of an insulating connection part used for connecting a power cable or the like, there is one in which a detection terminal is provided on an insulating plug attached to an open port communicating with the inside of the connection part (Patent Document 1), etc.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] [[ID=3⑧]] One of the objects of the present invention is to provide a means for easily grasping the internal voltage of an insulating connection part used in a special high-voltage line or a high-voltage line by a method different from the above-described conventional methods.

Means for Solving the Problems

[0006] The present invention, made to solve the above problems, is a system for measuring the internal voltage of an insulating connection used in extra-high voltage lines or high voltage lines, having at least an insulator, a shielding electrode, an internal electrode, an open port, and an insulating plug, and is characterized by comprising at least: a unit to be measured, consisting of one or more dielectrics connected in series with the insulating plug; a voltmeter capable of measuring the voltage value of any one of the one or more dielectrics; and a calculation unit that calculates the internal voltage of the insulating connection as a value obtained by multiplying the voltage value of the dielectric to be measured by a coefficient assigned to at least each component of the unit to be measured. Furthermore, the present invention relates to a method for measuring the internal voltage of an insulating connection used in an extra-high voltage line or a high voltage line, which has at least an insulator, a shielding electrode, an internal electrode, an open port, and an insulating plug, characterized in that the value obtained by multiplying the voltage value of a dielectric connected in series with the insulating plug by a predetermined coefficient is calculated as the internal voltage of the insulating connection. Furthermore, the present invention relates to an insulating plug that can be inserted into an open port provided in an insulating connection part used in extra-high voltage lines or high voltage lines, and is characterized in that it is provided with one or more dielectrics that are connected in series with the insulating plug and configured to measure voltage values. [Effects of the Invention]

[0007] According to the present invention, the internal voltage of an insulating connection used in extra-high voltage lines or high-voltage lines can be determined more easily. [Brief explanation of the drawing]

[0008] [Figure 1] A schematic diagram of the internal voltage measurement system for an insulated connection part according to Example 1. [Figure 2] A close-up view of the area around the insulating plug, showing an example of installation of the part to be measured. [Modes for carrying out the invention]

[0009] Hereinafter, embodiments of the present invention will be described with reference to the drawings. [Examples]

[0010] <1> Basic configuration (Figure 1) Figure 1 shows a schematic diagram of an example of the internal voltage measurement system for an insulated connection part according to the present invention (hereinafter also simply referred to as "measurement system A"). The measurement system A according to this embodiment is a system used to measure the internal voltage of an insulated connection part 10, and comprises at least a unit to be measured 20, a voltmeter 30, and a calculation unit 40. The details of each part are explained below.

[0011] <2> Insulated connection (Figure 1) The insulated connection part 10 is a component for connecting power cables, power equipment, and the like. In the present invention, the shape, structure, material, etc. of the insulating connection portion 10 are not particularly limited, and any form can be selected from known shapes and structures. The insulating connection part 10 according to the present invention naturally includes a T-shaped terminal connection part for connecting a power cable to power equipment, an intermediate connection part for connecting power cables to each other, an I-shaped bushing, a T-shaped rubber connector, a Y-shaped branch connection part, and so on. Furthermore, the insulating connection portion 10 in this embodiment is a T-shaped terminal connection portion.

[0012] <2.1>Component Configuration (Figure 1) The insulating connection part 10 according to the present invention comprises at least an insulator 11 constituting the main body portion of the insulating connection part 10, a shielding electrode 12 provided on the outer surface of the insulator 11, an internal electrode 13 arranged inside the insulator 11, an open port 14 that connects the inside and outside of the insulator 11, and an insulating plug 15 that can be inserted into the open port 14. The following describes the details of each component and part.

[0013] <2.2> Insulator (Figure 1) The insulator 11 constitutes the main body of the insulating connection part 10 and is a component for insulating the internal electrode 13, which will be described later, from the outside. In the present invention, the shape, structure, etc. of the insulator 11 are not particularly limited. The insulator 11 can be made of a hard plastic resin material with high mechanical strength (e.g., epoxy resin, fiber reinforced plastic (FRP), etc.).

[0014] <2.3> Shielding electrode (Fig. 1) The shielding electrode 12 is a member for preventing leakage of electricity from the internal electrode 13 provided in the insulator 11 to the outside. The shielding electrode 12 can be constituted by a conductive member provided on the outer surface of the insulator 11 or a conductive paint applied to the outer peripheral surface of the insulator 11.

[0015] <2.4> Internal electrode (Fig. 1) The internal electrode 13 is a member arranged inside the insulator 11 for energizing between a power cable or electrical equipment connected to the insulation connection part 10, etc. The internal electrode 13 can be made of a conductive material suitable for energization, such as copper, aluminum, copper alloy or aluminum alloy, or semiconductive rubber, etc. In Fig. 1, as the internal electrode 13, it has an internal electrode 13A electrically connected to the equipment side located on the left side of the paper surface and an internal electrode 13B electrically connected to the power cable connected from the lower side of the paper surface, and shows a configuration in which the internal electrode 13A and the internal electrode 13B are electrically connected via a connection conductor B arranged in a cavity provided inside the insulator 11. [[ID=2)1]]

[0016] <2.5> Openings (Fig. 1) The opening 14 is a part formed so as to communicate the inside and outside of the insulator 11. In the present invention, the position, shape, etc. of the opening 14 are not particularly limited. In this embodiment, an opening 14 is provided on the right side of the paper surface of the insulator 11, and this opening 14 is normally used with an insulating plug 15 attached, and is used as an energizing part to which an energizing cable (not shown) can be connected during a withstand voltage test.

[0017] <2.6> Insulating plug (Fig. 1) The insulating plug 15 is a component for closing the open port 14. In the present invention, the shape, structure, material, etc. of the insulating plug 15 are not particularly limited, and any form can be selected from known shapes, structures, materials, etc. The insulating plug 15 according to this embodiment has a shape and structure that allows it to be inserted and fitted into an open opening 14 that functions as the energized part of a T-shaped terminal connection (also called a "T-shaped terminal connection"). It has a main body 151 made of insulating material, a high-voltage side conductor 152 provided on the tip side of the main body 151, and a shielding side conductor 153 provided on the rear end side of the main body 151. After the insulating plug 15 is fitted into the open opening 14, the high-voltage side conductor 152 has a structure that electrically connects to the internal electrode 13. In the case of a T-shaped terminal connection as in the embodiment, the main body 151 of the insulating plug 15 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 11 (the insulating part on the side into which the insulating plug is inserted) is made of rubber, so in this case the main body 151 of the insulating plug 15 is made of epoxy resin or the like. In this embodiment, the high-voltage side conductor 152 is provided with a spring (not shown in the reference numerals) at the rear end of the shielding side conductor 153 to press the main body 151 of the insulating plug 153 against the inner surface of the insulator 11 of the opening 14 while applying surface pressure. In the configuration shown in Figure 2, multiple springs are provided, but one spring may suffice if surface pressure is applied between the insulator 11 and the main body 151, or a configuration without springs may be used if the conformability of the insulator 11 is sufficient.

[0018] <3> Unit under measurement (Figure 1) The part to be measured 20 is the part whose voltage value is measured by the voltmeter 30. The part to be measured 20 can be composed of at least one dielectric material that forms a series circuit by being connected in series with the insulating plug 15. In the present invention, the capacitance of the part to be measured 20, which is composed of at least one dielectric material, is configured to be greater than the capacitance of the insulating plug 15. Furthermore, in this invention, the types of dielectric materials constituting the part to be measured 20 are not particularly limited, and ceramic materials, plastic materials, glass, etc., can be used. For example, even if a material with a low dielectric constant (such as a semiconductor) is used as the dielectric, it is sufficient that the capacitance of the part to be measured 20 is greater than the capacitance of the insulating plug 15 by connecting multiple dielectric materials in series to constitute the part to be measured 20. The internal voltage of the insulating connection part 10 (the voltage applied to the internal electrode 13) causes a divided voltage to be generated in the insulating plug 15 and the dielectric connected in series with the insulating plug 15.

[0019] <3.1> Method of series connection with insulating plug In the present invention, the method of connecting the dielectric material constituting the measurement unit 20 and the insulating plug 15 in series is not particularly limited, and methods such as bringing the dielectric material into contact with the insulating plug 15 or separately wiring the insulating plug 15 and the dielectric material in series can be employed. For example, in Figure 2, the dielectric material constituting the measurement unit 20 is provided between the shielding conductor 153 located at the rear end of the insulating plug 15 and the back cover C (made of metal in this embodiment) that presses the insulating plug 15 toward the front end, thereby creating a configuration in which the dielectric material is in contact with the insulating plug 15. For example, in the embodiment of Figure 2, the dielectric material is in contact with the shielding conductor 153, but the embodiment is not limited to this. Furthermore, although the shape of the part to be measured 20 is shown as cylindrical in the embodiment of Figure 2, its shape is not limited. In the configuration where a spring is provided at the rear end of the insulating plug 15 (specifically, the rear end of the shielding conductor 153) as in the embodiment of Figure 2, it is sufficient that a hole is provided in the dielectric of the part to be measured 20 for the spring to pass through, so that the spring does not interfere with the dielectric. Also, the outer shape does not have to be circular.

[0020] <3.2>Measurement values ​​of dielectrics to be measured The number and type of dielectrics used in the measurement unit 20 are preferably designed so that the voltage value measured by the dielectric being measured in the measurement unit 20 is below the safety voltage, i.e., 50V or less, more preferably 25V or less. For example, the more dielectrics there are in series, the lower the voltage value across the dielectrics becomes. Also, the higher the dielectric constant of the dielectric, the lower the voltage value generated across the dielectrics becomes. In this invention, the number and type of dielectrics can be appropriately designed based on the above-mentioned effects and the planned internal voltage of the insulating connection part 10.

[0021] <3.3> Mounting method of the part to be measured The unit to be measured 20 can be configured in various ways, such as being pre-integrated with the insulating plug 15 or being detachable. For example, if the part to be measured 20 is pre-integrated with the insulating plug 15, the function of measuring the internal voltage to the insulating connection part 10 can be added to the existing insulating connection part 10 simply by replacing the conventional insulating plug 15 with the insulating plug 15 according to the present invention. Furthermore, by making the unit to be measured 20 detachably attachable to the insulating plug 15, it is possible to reuse the insulating plug 15 used in the existing insulating connection 10 while adding a function to measure the internal voltage to the insulating connection 10.

[0022] <4> Voltmeter (Figure 1) The voltmeter 30 is a device for measuring the voltage value of the dielectric material to be measured in the unit under measurement 20. In this invention, there are no particular limitations on the type or number of voltmeters 30, or the method for measuring the voltage to the dielectric. As shown in Figure 1, the voltmeter 30 is connected in parallel with the unit to be measured 20, which is connected in series with the insulating plug 15.

[0023] <5> Calculation unit (Figure 1) The calculation unit 40 is a device that performs the function of determining the internal voltage of the insulated connection part 10 based on the voltage value measured by the voltmeter 30. The calculation unit 40 can use an information processing device that acquires the voltage value measured by the voltmeter 30 by any method (automatically or manually). As the information processing device, applications installed on general-purpose information processing terminals such as PCs, tablets, and smartphones, or dedicated embedded devices with calculation programs incorporated into microcomputers, etc., can be used.

[0024] <5.1> Calculation details (Figure 1) The calculation unit 40 has the function of calculating the internal voltage of the insulated connection unit 10 by multiplying the voltage value measured by the voltmeter 30 by a predetermined coefficient. This coefficient is configured to be assigned to each value of the voltage applied to the internal electrode 13 and to each component of the unit being measured 20 (number and type of dielectric material, etc.). For example, Table 1 below shows an example of a table of coefficient assignments for each planned voltage applied to the internal electrode 13 when a single dielectric material, such as a perovskite oxide, is used as the part to be measured 20.

[0025] [Table 1] TIFF2026048419000002.tif33150

[0026] 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.

[0027] <5.2> Addition of monitoring function In this invention, the calculation unit 40 may be provided with a monitoring function for detecting abnormalities in the internal voltage of the insulated connection unit 10. For example, the calculation unit 40 can store a predetermined normal value for the internal voltage in advance, compare that normal value with the calculated internal voltage, and if the internal voltage is lower than the normal value, it can be given a function to notify the user of an alarm. Furthermore, in this invention, in addition to monitoring the internal voltage of the insulated connection calculated by the calculation unit 40, the voltage value of the dielectric being measured may also be monitored. In this case, the calculation unit 40 can separately store and compare the normal expected value as the dielectric voltage value.

[0028] <6> summary As described above, the internal voltage measurement system for insulating connections according to the present invention can provide at least one of the effects described below. (1) The internal voltage of the insulated connection can be determined while the circuit is still live. (2) 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, so fault detection can be performed on a phase-by-phase basis rather than detecting all three phases at once. (3) The design ensures that the voltage of the dielectric material being measured is 50V or less, allowing measurement work to be performed while ensuring the safety of the workers. (4) Since the fluctuation in the voltage value of the dielectric material measured by the measurement unit is linked to the fluctuation in the internal voltage of the insulating connection, it can also be used for voltage monitoring purposes. [Explanation of symbols]

[0029] A: Measurement system 10: Insulated connection part 11: Insulator 12: Shielding electrode 13: Internal electrode 14: Open mouth 15: Insulating plug 151: Main body 152: High-voltage side conductor 153: Shielding side conductor 20: Unit under measurement 30: Voltmeter 40: Arithmetic section B: Connecting conductor C: Case back

Claims

1. A system for measuring the internal voltage of an insulated connection used in extra-high voltage lines or high voltage lines, having at least an insulator, a shielding electrode, an internal electrode, an open port, and an insulating plug, The unit to be measured consists of one or more dielectrics connected in series with the insulating plug, A voltmeter capable of measuring the voltage value of any one of the aforementioned dielectrics, A calculation unit calculates the internal voltage of the insulating connection part by multiplying the voltage value of the dielectric being measured by a coefficient assigned to at least each component of the part being measured, Characterized by comprising at least the following: Internal voltage measurement system for insulated connections.

2. The unit being measured is configured such that the voltage value in the dielectric being measured is 50V or less. The internal voltage measurement system for an insulated connection part according to claim 1.

3. The calculation unit is characterized in that it assigns the coefficients according to the type of dielectric, the number of dielectrics, and the planned value of the voltage applied to the insulating connection. The internal voltage measurement system for an insulated connection part according to claim 1.

4. The capacitance of the part to be measured is larger than the capacitance of the insulating plug. The internal voltage measurement system for an insulated connection part according to claim 1.

5. A method for measuring the internal voltage of an insulated connection used in extra-high voltage lines or high voltage lines, having at least an insulator, a shielding electrode, an internal electrode, an open port, and an insulating plug, The method is characterized by calculating the internal voltage of the insulating connection portion by multiplying the voltage value of the dielectric connected in series with the insulating plug by a predetermined coefficient. Method for measuring the internal voltage of an insulated connection.

6. An insulating plug that can be inserted into an open port provided in an insulating connection used in extra-high voltage lines or high-voltage lines, The device is characterized by having one or more dielectric materials that are connected in series with the insulating plug and configured to measure voltage values. Insulating plug for insulated connections.

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