KR20160118687A - Dielectric Constant Equipment and Its measurement method for Cable in NPPs - Google Patents

Dielectric Constant Equipment and Its measurement method for Cable in NPPs Download PDF

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KR20160118687A
KR20160118687A KR1020150047173A KR20150047173A KR20160118687A KR 20160118687 A KR20160118687 A KR 20160118687A KR 1020150047173 A KR1020150047173 A KR 1020150047173A KR 20150047173 A KR20150047173 A KR 20150047173A KR 20160118687 A KR20160118687 A KR 20160118687A
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South Korea
Prior art keywords
cable
dielectric constant
jig
electrode plate
nuclear
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KR1020150047173A
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Korean (ko)
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정충희
지성현
김인용
신용덕
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한국원자력안전기술원
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
    • G01R27/2617—Measuring dielectric properties, e.g. constants
    • G01R27/2623—Measuring-systems or electronic circuits
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
    • G01R27/2617—Measuring dielectric properties, e.g. constants
    • G01R27/2635—Sample holders, electrodes or excitation arrangements, e.g. sensors or measuring cells
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
    • G01R29/12—Measuring electrostatic fields or voltage-potential
    • G01R31/021—

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Relating To Insulation (AREA)

Abstract

The present invention relates to nuclear power cable dielectric constant measuring equipment and a measuring method thereof. The equipment comprises: a potentiometer (1) for measuring potential differences; a zig (2), connected to the potentiometer (1), for measuring a dielectric constant of a nuclear power cable sample, arranged between a fixated electrode plate (26) and a movable electrode plate (25); an inducing switch (3) connected to the zig (2) by a connection line (4); and a power provider (5) to provide power for the zig (2). The zig (2) is arranged in an L shape at the lower part; a movable supporter (23), formed at the upper part of the fixated supporter (22), formed in an L shape at the upper part to move back and forth; a power port (24) formed at the back side of the upper part of the fixated supporter (22); a fixated plate (27) fixated on the inner side of the fixated supporter (22) by a fixating pin; the fixated electrode plate (26) formed in front of the fixated plate (27); the movable electrode plate (25) at the rear part of the upper part of the movable supporter (22); and the power port (24) at the front part of the upper part of the movable supporter (22).

Description

TECHNICAL FIELD [0001] The present invention relates to a cable dielectric constant measurement apparatus and a measurement method using the dielectric dielectric constant measurement apparatus.

The present invention relates to a nuclear cable dielectric constant measuring apparatus for measuring a dielectric constant of a cable insulation material used in a nuclear power plant and monitoring an aged deterioration state, and a measurement method using the same.

As a method of monitoring the state of nuclear cables studied in Korea and abroad, methods of using the chemical, physical and electrical properties of cable insulation materials have been proposed.

Thermo Gravimetric Analysis (TGA) and Elongation at Break (EAB) using physical properties are the most commonly used nuclear cable state monitoring methods in Korea.

In particular, the EAB method based on tensile tests has been internationally standardized and has been recognized as a standard of state surveillance. However, this condition monitoring method requires that cable samples be destroyed. Therefore, it is necessary to use a large amount of cable samples for accurate measurement, ), Rubber materials, and mixtures of two layered structures.

In addition, it is difficult to observe the state of all nuclear cables in one method because it is not easy to derive correlation between measured values and deterioration of cable.

Therefore, in order to overcome the disadvantages of the existing nuclear cable condition monitoring methods, the state monitoring method using the dielectric constant considering the characteristics of the nuclear cable has been proposed, and it has become necessary to develop the dielectric constant measurement apparatus and measurement method. This state monitoring method accurately measures the degree of deterioration of nuclear cable insulation materials (insulating materials and sheathing) over time under various environmental conditions of a nuclear power plant with a dielectric constant, so that the degree of deterioration (deterioration) It can be applied to all kinds of cable, it is relatively easy to measure compared to other monitoring methods (it can measure within 30 seconds), non-destructive method consumes less cable sample, It is a method to satisfy the recommendation of the regulatory standard (Regulatory Guide 1.218 etc.) prepared according to the international research result because it is easy to use the combination.

In particular, this state monitoring method has developed measurement equipment and measurement method to share the measurement sample with the volume electric resistivity method (Patent No. 10-1328994, 2013.11.07. Due to the increase in the number of nuclear power plants and the increase in the design life span of new nuclear power plants, it is expected that the demand for the state monitoring method for newly developed new nuclear power cables will increase.

Korean Patent Registration No. 1013289940000 (2013.11.07) is a device for monitoring the state of a cable installed in a nuclear power plant, and it measures the volume electrical resistivity of a cable insulation material (polymer) Which is composed of a jig (1), a voltmeter (2), an ammeter (3) and a power supply (4) for measuring a cable sample,

Korean Registered Patent Publication No. 1014147700000 (Apr. 26, 2014) discloses a light source comprising: a first light source for irradiating a first inspection light and an inspection completed signal light to an optical cable; A first light receiving unit for obtaining reflected light generated by the first inspection light reflected from the optical cable; A second light receiving unit for acquiring second inspection light emitted from the second light source of the external light source device which has received the inspection completed signal light; A switching unit for converting an incident path of the second inspection light into the second light receiving unit; And calculating the optical loss ratio information by referring to the second inspection light, comparing the section length information and the optical loss ratio information with a preset reference value, An optical metrology inspection apparatus using an optical metrology apparatus and an optical fiber inspection method using the optical metrology apparatus for checking the state of an optical cable including a control unit for determining a status,

Korean Patent Laid-Open Publication No. 1020030059762 (July 10, 2003) discloses a rotating body which is rotatably coupled to one end side of a fixed body and a fixed body moving around a surface of a cable by a wheel driven by a motor for forward and backward movement A CT module and a detector arranged in opposition to each other at an outer circumferential portion of the rotating body; A camera disposed between the CT module and the detector at an outer peripheral portion of the rotating body for capturing a surface image of the cable; A surface image processing unit for converting the analog surface image data obtained by the camera of the image photographing unit into digital surface image data; a first compression unit for compressing the digital surface image data; A second compression unit for compressing the digital perspective image data, a motor for forward and backward rotation, a video image pickup unit, a surface image processing unit, and a perspective image processing unit and a compression unit, And a transmission and reception unit for transmitting and receiving the compressed surface image data, the perspective image data, and the control data of the control unit to and from the remote monitoring computer,

The Korean Registered Patent Publication No. 1012648750000 (2013.05.09) discloses a vehicle cable for effectively eliminating a connector and performing an electrical performance test when constructing a tester for missing parts inspections and electrical performance tests of a vehicle cable Provides a jig for connector inspection. The jig 10 includes a cradle block 12, a sensor 13, a sliding block 14 and an actuator 18 so as to be installed in a tester for inspecting whether or not the auxiliary material of the vehicle cable 1 is missing, And terminals 2a connected through the electric wires 3 are provided so that the connector 2 connected to both ends of the vehicle cable 1 can be omitted and electrical performance can be checked. Such a jig 10 applies a generally used computer 110 in the field of manufacturing the vehicle cable 1 to release the sliding block 14 that locks the connector 2, There is an advantage that a mechanism for releasing the connector 2 through the environment can be implemented.

1. Korean Patent Registration No. 1013289940000 (Nov. 31, 2013) 2. Registered Patent Registration No. 1014147700000 (2014.06.26) 3. Korean Patent Laid-Open Publication No. 1020030059762 (July 10, 2003) 4. Patent Registration No. 1012648750000 (2013.05.09)

The above-described conventional techniques are used for measuring a nuclear cable, which is usually obtained from a nuclear power plant operating in a long-term operation. However, a relatively small number of samples are used because the sampling is limited. It is difficult to adjust the size and thickness of the sample when the measurement is directly performed.

The present invention relates to a device for measuring electric resistivity of a nuclear electric cable volume and a measuring method using the electric resistivity meter of the present invention, (1) for measuring the dielectric constant of a nuclear cable sample connected to the potentiometer (1) and located between the fixed electrode plate (26) and the moving electrode plate (25) An induction switch 3 connected to the jig 2 by a connection line 4 and a power supply 5 for supplying power to the jig 2,

The jig 2 includes a fixed support 22 with a scale on its lower side and an upper portion on the front of the fixed support 22 and having a " A power port 24 provided at the upper rear surface of the fixed support 22 and a power port 24 provided inside the fixed support 22 to be fixed to the fixed support 22, A fixed electrode plate 26 provided on the front surface of the fixed plate 27; a movable electrode plate 25 provided on the upper rear surface of the movable support table 22; And a power port (24) installed on the front surface of the dielectric constant measuring device, and a measuring method using the dielectric constant measuring device.

The present invention will be used for research on nuclear cable condition monitoring and for evaluating the aging deterioration of cables installed in nuclear power plants. It is also effective as a method for evaluating the integrity of nuclear cables immersed in seawater as in the case of Fukushima accident in Japan. It is difficult to adjust the size and thickness of the sample when the sample is taken from the nuclear power plant in long-term operation and there is a limit to the sampling, It is possible to measure freely in such a change, it is relatively easy to measure compared with other methods, it does not need many measurement samples, it is possible to measure within a short time (within 30 seconds)

Furthermore, it is possible to study the state of nuclear cable condition monitoring using dielectric constant, and this study is based on the fact that it is possible to carry out a comparison test of state monitoring method by accumulating the state value The evaluation of reasonable deterioration through data will help to predict the life expectancy of nuclear cable safely and scientifically. In the future, the establishment of deterioration management system and reasonable deterioration evaluation of nuclear cable of nuclear power cable in Korea and the seawater flooding like Fukushima accident in Japan, There is an advantage that can be applied to the safety (soundness) evaluation of flooded nuclear cables.

1 is a flow chart of a nuclear cable dielectric constant measurement apparatus according to the present invention;
Fig. 2 Photograph of a nuclear cable dielectric constant measuring apparatus of the present invention
3 is a front view of the jig of the present invention
4 is a left side view of the jig of the present invention
Fig. 5 Detail view of the jig front of the present invention
Fig. 6 Detail view of the left side surface of the jig of the present invention
7 Detail view of the right side of the jig of the present invention

The present invention relates to a potentiometer 1 for measuring a potential difference and a jig for measuring a dielectric constant of a nuclear cable sample which is connected to the potentiometer 1 and is located between a fixed electrode plate 26 and a moving electrode plate 25 An induction switch 3 connected to the jig 2 by a connection line 4 and a power supply 5 for supplying power to the jig 2,

The jig 2 includes a fixed support 22 with a scale on its lower side and an upper portion on the front of the fixed support 22 and having a " A power port 24 provided at the upper rear surface of the fixed support 22 and a power port 24 provided inside the fixed support 22 to be fixed to the fixed support 22, A fixed electrode plate 26 provided on the front surface of the fixed plate 27; a movable electrode plate 25 provided on the upper rear surface of the movable support table 22; And a power port (24) provided on the front surface of the dielectric member, and a measurement method using the same.

The dielectric constant of the nuclear cable of the present invention is measured by inserting a cable sample taken from a nuclear power source between jig electrodes and then applying a voltage using a power supply, an induction switch, a voltmeter, Measure the voltage. The charging voltage of the atmosphere at the time of measurement is also measured in this manner.

The present invention comprises a potentiometer (1) for measuring a cable sample, a jig (2) for measuring a dielectric constant, an induction switch (3), a connecting line (4) and a power supply (5).

The jig of the present invention is for measuring a dielectric constant and is used when a charging voltage and a power supply (suction current) when a charging phenomenon occurs due to a suction current (charging charge) supplied with power and flowing into a cable sample is cut off To measure the potential difference across the sample.

As shown in Figs. 3 and 4, the jig 2 of the present invention has a fixing and moving support using an insulating material (epoxy resin) having high insulation and mechanical strength, a gap between a fixed electrode plate (left) and a moving electrode plate A fixed plate 27 for keeping the voltage applied to both ends of the cable sample at a constant level by keeping the same constant, a scale of the fixed support 22 capable of simultaneously measuring the thickness of the cable sample at the time of measuring the dielectric constant, (+) And the movable electrode plate (-) so that the current flowing through the electrodes of the movable electrode plate can be limited to a small extent, It is not only easy to insulate, but also improves the safety of the measuring device and the test center by restricting the size of the fault current even in case of an accident such as short circuit or insulation breakdown.

Since the current gain (influence by the residual charge) occurs when the DC is charged for 1 minute or more with respect to the measurement time and the number of times, the applied voltage is maintained at 100 V for 10 seconds at room temperature The measurement was carried out, the positive electrode was short-circuited for the next measurement, the remaining charge was removed, and the waiting time was 20 seconds, and a total of five or more measurements were performed to minimize the measurement error.

It is important to avoid external influences due to the influence of external power change and noise caused by electromagnetic waves when measuring dielectric constant in relation to shielding. In this equipment, a shielding body made of aluminum material and a power filter for supplying a constant power are used.

Hereinafter, the present invention will be described in detail with reference to examples.

Example

As shown in Fig. 3, a measurement nuclear cable sample is placed on the fixed electrode plate 26 of the fixed support 22 of the dielectric constant measuring jig 2, and the movable electrode plate 25 of the movable support 23 is moved After the sample is firmly inserted into the cable sample, the test voltage is applied to the cable sample by using the induction switch 3 after supplying the test power from the power supply 5, and the charge is absorbed by the absorption current absorbed into the sample The potential difference across the left and right electrode plates is measured using a potentiometer (1) when charging and after the test power is turned off,

The sample thickness of the nuclear cable is measured by the scale provided at the lower portion of the fixed support 22 and the lower portion of the movable support 23 abutting the scale,

The applied voltage was maintained at 100 V for 10 seconds at room temperature, and the measurement was performed. After waiting for 20 seconds for the next measurement, a total of 5 measurements or more was measured and averaged. The power-off time was maintained for 1 minute or more (Not shown), and the dielectric constant was automatically calculated through a program using the following equation.

next

Figure pat00001
Q = C x VC = Q / V

here,

Figure pat00002
Is the dielectric constant, V is the value of the potential difference, Q is the value of the charge amount, C is the capacitance of the cable sample, C 0 is the capacitance of the air

Dielectric constant (

Figure pat00003
) Is calculated by charging the cable sample between the jig electrodes and applying a voltage to the charging voltage (V) when the charging phenomenon occurs and the charging voltage (V E ) hanging on the cable sample when the applied voltage is instantaneously cut off If the measured thrust as input to the calculation program (calculation) when the capacitance (C) of the samples is calculated, and the standby capacitance (C 0) also rescued by the formula was measured in the same manner as above, the ratio of the two values (
Figure pat00004
= C / C 0 ), the dielectric constant of the cable sample is calculated.

The dielectric constant calculated and measured by the present invention is a basic constant indicating the inherent dielectric property of a nuclear cable sample. Through analysis of the dielectric constant change, the amount of change in the physical and chemical properties of the cable sample and the degree of deterioration And it was confirmed that when the degradation progression of the sample is large, the amount of change of the physical / chemical characteristics of the sample is large, the insulating property is decreased, and the sample dielectric constant is also decreased.

Hereinafter, the present invention will be described in detail with reference to the drawings.

Fig. 2 is a flow chart of a nuclear cable dielectric constant measuring apparatus of the present invention, Fig. 2 is a photograph of a nuclear cable dielectric constant measuring apparatus of the present invention, Fig. 3 is a measured front view of the jig of the present invention, FIG. 6 is a detailed front view of the jig of the present invention, FIG. 6 is a detailed view of the left side of the jig of the present invention, and FIG. 7 is a detailed view of the right side of the jig of the present invention.

2 to 7, a dielectric constant measuring apparatus for a nuclear cable according to the present invention comprises a potentiometer 1 for measuring a potential difference, a fixed electrode plate 26 and a moving electrode plate 25 connected to the potentiometer 1, A jig 2 for measuring the dielectric constant of the nuclear cable sample located between the jig 2 and the induction switch 3 connected to the jig 2 by a connection line 4, A power supply 5,

As shown in Figs. 3 to 7, the jig 2 includes a fixed supporter 22 having a "b" shape on its lower side and a scale on its lower side. The jig 2 is located above the front surface of the fixed supporter 22, A movable support 23 provided on the fixed support 22 so as to be movable back and forth,

A power supply port 24 provided on the upper rear surface of the fixed support 22, a fixed plate 27 installed inside the fixed support 22 and fixed by a fixing pin, An electrode plate 26,

A movable electrode plate 25 provided on the upper rear surface of the movable support 22 and a power port 24 provided on the upper surface of the movable support 22.

The power supply 5, the fixed support 22, the movable support 23, the power port 24, the movable electrode plate 25 (see FIG. 1), the jig 2, the induction switch 3, the connecting line 4, A fixed electrode plate 26, a fixed plate 27, a sample 30,

Claims (3)

A dielectric constant measuring apparatus for a nuclear power cable,
A jig 2 for measuring a dielectric constant of a nuclear cable sample which is connected between the fixed electrode plate 26 and the moving electrode plate 25 and is connected to the potentiometer 1, , An induction switch (3) connected to the jig (2) by a connection line (4), and a power supply (5) for supplying power to the jig (2) Constant measuring device.
The jig (2) according to claim 1, wherein the jig (2) comprises a fixed support (22) having a " A movable support 23 provided to be movable forward and backward above the support 22,
A power supply port 24 provided on the upper rear surface of the fixed support 22, a fixed plate 27 installed inside the fixed support 22 and fixed by a fixing pin, An electrode plate 26,
A movable electrode plate 25 provided on the upper rear surface of the movable support 22 and a power port 24 provided on the upper surface of the movable support 22, Measuring device.
A measuring method using a dielectric constant measuring device for a nuclear cable,
The measurement nuclear cable sample is placed on the fixed electrode plate 26 of the fixed support 22 of the dielectric constant measuring jig 2 and the moving electrode plate 25 of the movable support 23 is moved to the nuclear cable sample The test voltage is applied to the cable sample by using the induction switch 3 to measure the time when the charge is charged by the absorption current absorbed into the sample, After the power supply is turned off, the potential difference across the left and right electrode plates is measured using a potentiometer (1)
The sample thickness of the nuclear cable is measured by the scale provided at the lower portion of the fixed support 22 and the scale provided at the lower portion of the movement support 23,
The applied voltage was maintained at 100 V for 10 seconds at room temperature, and the measurement was performed. After waiting for 20 seconds for the next measurement, a total of 5 measurements or more was measured and averaged. The power-off time was maintained for 1 minute or more And a dielectric constant is automatically calculated and measured through a program which is transmitted to a central processor (not shown) using the following calculation formula.


next

Figure pat00005
Q = C x VC = Q / V

here,
Figure pat00006
Is the dielectric constant, V is the value of the potential difference, Q is the value of the charge amount, C is the capacitance of the cable sample, C 0 is the electrostatic capacitance of air.
KR1020150047173A 2015-04-03 2015-04-03 Dielectric Constant Equipment and Its measurement method for Cable in NPPs KR20160118687A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20220064506A (en) 2020-11-12 2022-05-19 주식회사 에이이에스텍 Precise Measurement Device of the Dielectric Constants of Solid Dielectrics

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20030059762A (en) 2003-06-02 2003-07-10 인태환 A robot for inspecting a cable, method the same, and media embeded with a program for it
KR101264875B1 (en) 2012-03-16 2013-05-20 삼세산업 주식회사 Connector detection jig for cable of vehicle
KR101328994B1 (en) 2012-01-09 2013-11-13 한국원자력안전기술원 Volume Electrical Resistivity Equipment for Cable in NPPs
KR101414770B1 (en) 2014-02-12 2014-07-03 (주)파이버베이스 Optical measuring device for testing state of optical cable, optical inspecting device using the same, and method for inspecting optical capble using optical measuring device and optical source device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20030059762A (en) 2003-06-02 2003-07-10 인태환 A robot for inspecting a cable, method the same, and media embeded with a program for it
KR101328994B1 (en) 2012-01-09 2013-11-13 한국원자력안전기술원 Volume Electrical Resistivity Equipment for Cable in NPPs
KR101264875B1 (en) 2012-03-16 2013-05-20 삼세산업 주식회사 Connector detection jig for cable of vehicle
KR101414770B1 (en) 2014-02-12 2014-07-03 (주)파이버베이스 Optical measuring device for testing state of optical cable, optical inspecting device using the same, and method for inspecting optical capble using optical measuring device and optical source device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20220064506A (en) 2020-11-12 2022-05-19 주식회사 에이이에스텍 Precise Measurement Device of the Dielectric Constants of Solid Dielectrics

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