WO2014046468A1 - Device for compensating for inductance or capacitance of underground power transmission cable joint box and method therefor - Google Patents

Device for compensating for inductance or capacitance of underground power transmission cable joint box and method therefor Download PDF

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Publication number
WO2014046468A1
WO2014046468A1 PCT/KR2013/008419 KR2013008419W WO2014046468A1 WO 2014046468 A1 WO2014046468 A1 WO 2014046468A1 KR 2013008419 W KR2013008419 W KR 2013008419W WO 2014046468 A1 WO2014046468 A1 WO 2014046468A1
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Prior art keywords
inductance
capacitance
junction box
transmission cable
compensating
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PCT/KR2013/008419
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French (fr)
Korean (ko)
Inventor
정채균
양병모
강지원
박흥석
박진우
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한국전력공사
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Publication of WO2014046468A1 publication Critical patent/WO2014046468A1/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G01R31/11—Locating faults in cables, transmission lines, or networks using pulse reflection methods
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/22—Arrangements for adjusting, eliminating or compensating reactive power in networks in cables
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
    • G01R31/083—Locating faults in cables, transmission lines, or networks according to type of conductors in cables, e.g. underground
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
    • G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
    • G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G15/00—Cable fittings
    • H02G15/08—Cable junctions
    • H02G15/10—Cable junctions protected by boxes, e.g. by distribution, connection or junction boxes
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G9/00—Installations of electric cables or lines in or on the ground or water

Definitions

  • the present invention relates to an apparatus for compensating the inductance or capacitance of an underground transmission cable junction box and a method thereof, and more particularly, to using a traveling wave characteristic in an underground transmission cable.
  • the intermediate junction box connecting the underground transmission cable is molded in the factory and then assembled with the cable line in the field.
  • a detection test is performed on the point of failure or partial discharge by using the propagation wave characteristics of the cable line.
  • the cross-bonding effect of the junction box affects the characteristic impedance as the connection phase of the sheath changes, so that the signal becomes irregular and the transmission and reflection effect of the traveling wave generated from the junction box There was a problem that is difficult to observe accurately.
  • Korean Patent Registration No. 10-08667512 includes a circuit for adjusting the overall impedance of the partial discharge current loop in the junction box so that the total impedance of the partial discharge current loop has the smallest value as much as possible.
  • the invention improves the detection sensitivity of the partial discharge signal, this is limited in minimizing the overall impedance without compensating the inductance (L) or capacitance (C) of the junction box and the cable line.
  • the present invention has been invented to solve the above problems, by compensating the inductance (L) or capacitance (C) value of the junction box to maintain the same as the characteristic impedance of the cable line, the transmission of the traveling wave generated in the junction box And an apparatus and method for compensating for inductance or capacitance of an underground power transmission cable junction box that can eliminate reflection influences.
  • the present invention eliminates the transmission and reflection effects of traveling waves generated in the junction box, thereby minimizing the possibility of misjudging the signal reflected in the junction box as the signal reflected at the point of failure or partial discharge. It is an object of the present invention to provide an apparatus and a method for compensating for inductance or capacitance of a junction box.
  • the present invention eliminates the transmission and reflection influence of the traveling wave generated in the junction box, it is easy to observe the waveform of the signal reflected from the failure or partial discharge point underground transmission cable that can detect more accurate failure or partial discharge point It is an object of the present invention to provide an apparatus and a method for compensating for inductance or capacitance of a junction box.
  • an object of the present invention is to provide an apparatus and a method for compensating for inductance or capacitance of an underground transmission cable junction box capable of appropriately applying the inductance or capacitance compensated according to the characteristics of the underground transmission cable.
  • the compensator may include an inductance compensator for compensating the inductance of the junction box or a capacitance compensator for compensating the capacitance of the junction box.
  • the inductance compensator may include a first input unit configured to receive an inductance and a capacitance of the underground power transmission cable and an inductance and a capacitance of the junction box; The difference in inductance appearing in the characteristic impedance of the underground transmission cable including the inductance and the capacitance of the underground transmission cable and the characteristic impedance of the junction box including the inductance and the capacitance of the junction box as an inductance compensation value for compensating the inductance of the junction box.
  • An inductance compensation value calculating unit for calculating;
  • an inductance compensation value applying unit configured to maintain the characteristic impedance of the underground transmission cable and the characteristic impedance of the junction box by applying the inductance compensation value.
  • the capacitance compensator may include a second input unit configured to receive an inductance and a capacitance of the underground power transmission cable and an inductance and a capacitance of the junction box;
  • a capacitance compensation value applying unit for applying the capacitance compensation value to keep the characteristic impedance of the underground power transmission cable and the characteristic impedance of the junction box the same.
  • connection conductor portion and the external terminal portion is characterized in that the conductor fixing parts provided on both sides of the connection conductor portion is fastened and fixed to the external terminal portion.
  • the conductor fixing is characterized in that it is formed in the form of tongs.
  • the housing portion is formed of an insulating material.
  • the method for compensating the inductance or capacitance of the underground power transmission cable junction box according to the present invention for achieving the above object is provided inside the connection conductor electrically connected to the external terminal portion of the underground power transmission cable junction box or the inductance (L) of the junction box or A method of compensating for an inductance or capacitance of an underground power transmission cable junction box including a compensating unit for compensating capacitance (C), the method of compensating for an inductance and capacitance of the underground power transmission cable and the inductance and capacitance of the junction box by the compensation unit.
  • a compensating unit for compensating capacitance (C) the method of compensating for an inductance and capacitance of the underground power transmission cable and the inductance and capacitance of the junction box by the compensation unit.
  • the compensator may include an inductance compensator for compensating the inductance of the junction box or a capacitance compensator for compensating the capacitance of the junction box.
  • the inductance compensator includes the characteristic impedance of the underground transmission cable including the inductance and the capacitance of the underground transmission cable and the inductance appearing in the characteristic impedance of the junction box including the inductance and capacitance of the junction box.
  • the difference value is calculated as an inductance compensation value for compensating for the inductance of the junction box.
  • the inductance compensation unit is characterized in that for applying the inductance compensation value.
  • the capacitance compensator includes a characteristic impedance of the underground transmission cable including an inductance and a capacitance of the underground transmission cable and a capacitance appearing in a characteristic impedance of the junction box including an inductance and a capacitance of the junction box.
  • the difference value is calculated as a capacitance compensation value for compensating for the capacitance of the junction box.
  • the capacitance compensation unit is characterized in that for applying the capacitance compensation value.
  • Apparatus and method for compensating for inductance or capacitance of underground transmission cable junction box according to the present invention having the configuration as described above are compensated for the inductance (L) or capacitance (C) value of the junction box to maintain the same as the characteristic impedance of the cable line By doing so, it is possible to eliminate the transmission and reflection effects of the traveling wave generated in the junction box.
  • the present invention minimizes the possibility of misjudging a signal reflected in a junction box as a signal reflected at a failure or partial discharge point, thereby making it easier to observe a waveform of a signal reflected at the failure or partial discharge point, thereby making it more accurate. It has the effect of detecting the partial discharge point.
  • the present invention has an effect that can be appropriately applied to the inductance or capacitance compensated according to the characteristics of the underground power transmission cable.
  • FIG. 1 is a cross-sectional view showing the appearance of a device for compensating the inductance of the underground power cable connection box according to an embodiment of the present invention.
  • FIG. 2 is a block diagram of an inductance compensator of an apparatus for compensating for inductance of an underground power transmission cable connection box according to an exemplary embodiment of the present invention.
  • FIG 3 is a cross-sectional view showing a state of the connection fixing employed in the device for compensating the inductance of the underground power transmission cable connection box according to an embodiment of the present invention.
  • FIG. 4 is a cross-sectional view showing an apparatus for compensating for capacitance of an underground power transmission cable connection box according to an exemplary embodiment of the present invention.
  • FIG. 5 is a block diagram of a capacitance compensation unit of the device for compensating for the capacitance of the underground power cable connection box according to an embodiment of the present invention.
  • FIG. 6 is a cross-sectional view showing a cable according to an embodiment of the present invention.
  • FIG. 7 is a cross-sectional view illustrating a state in which an apparatus for compensating for inductance of an underground power transmission cable junction box is connected and fixed to the underground power transmission cable junction box.
  • FIG. 8 is a cross-sectional view illustrating a state in which an apparatus for compensating capacitance of an underground power transmission cable junction box is connected and fixed to the underground transmission cable junction box according to an embodiment of the present invention.
  • FIG. 9 is a flowchart illustrating a method for compensating for inductance or capacitance of an underground power transmission cable junction box according to an exemplary embodiment of the present invention.
  • FIG. 10 is a graph analyzing the traveling wave characteristics before applying the device for compensating the inductance or capacitance of the underground power cable connection box according to an embodiment of the present invention.
  • FIG. 11 is a graph analyzing the traveling wave characteristics after application of a device for compensating for inductance or capacitance of an underground power transmission cable connection box according to an exemplary embodiment of the present invention.
  • FIG. 1 is a cross-sectional view showing a device for compensating the inductance of the underground power transmission cable junction box according to an embodiment of the present invention
  • Figure 2 is an inductance of the device for compensating the inductance of the underground power transmission cable junction box according to an embodiment of the present invention
  • FIG. 3 is a cross-sectional view illustrating a connection fixing part employed in an apparatus for compensating the inductance of an underground power transmission cable connection box according to an embodiment of the present invention
  • FIG. 4 is an embodiment of the present invention.
  • FIG. 5 is a cross-sectional view illustrating an apparatus for compensating capacitance of an underground power transmission cable junction box according to an embodiment of the present invention
  • FIG. 5 is a configuration diagram of a capacitance compensation unit of an apparatus for compensating capacitance of an underground power transmission cable junction box according to an embodiment of the present invention.
  • 6 is a cross-sectional view showing a cable according to an embodiment of the present invention
  • Figure 7 is a ground power transmission cable contact according to an embodiment of the present invention
  • FIG. 8 is a cross-sectional view illustrating a device of compensating for inductance of a subordinate box connected to an underground power transmission cable junction box.
  • FIG. 8 is a view illustrating an apparatus for compensating for capacitance of an underground power transmission cable junction box according to an embodiment of the present invention. It is sectional drawing which shows the fixed state.
  • the device (100a, 100b) for compensating the inductance or capacitance of the underground power transmission cable connection box comprises a connection conductor 110, a compensator (120a, 120b) and a conductor fixing portion (115)
  • the description will be made by dividing the apparatus 100a for compensating the inductance of the underground power transmission cable junction box and the apparatus 100b for compensating the capacitance of the underground power transmission cable junction box.
  • the device (100a, 100b) for compensating the inductance or capacitance of the underground power transmission cable connection box according to the present invention may adopt the device (100a) for compensating the inductance according to the characteristics of the cable, the device (100b) for compensating capacitance ) Can be adopted.
  • the apparatus 100a for compensating for inductance includes a connecting conductor part 110, an inductance compensator 120a, and a conductor fixing part 115.
  • connection conductor unit 110 is electrically connected to the external terminal unit 240 of the underground power transmission cable connection box 200.
  • the length of the connection conductor part 110 may be formed differently according to the distance between the external terminal parts of the junction box 200. That is, since the distance between the external terminal portion 240 of the junction box 200 varies depending on the transmission voltage rating or the type of the junction box 200, it is preferable that the length of the connection conductor part 110 is changed accordingly.
  • the configuration of the junction box 200 as shown in Figure 7, underground transmission cable junction box 200 inside the conductor 210 for the cable connection is connected to the sleeve, the cable 230 sheathing the outer shell
  • the stress cone 225 is installed in the insulator 220 including the outer semiconducting layer for the purpose of mitigating the electric field distribution.
  • cross-bonding is performed between the outer terminal portion of the wound box 200 through the outer terminal portion 240 which is connected to the conductor 210 and exposed to the outside.
  • the configuration of the underground power transmission cable junction box 200 connected to the device 100a compensating for such inductance is the same as the configuration of the underground transmission cable junction box 200 connected to the device 100b compensating capacitance. .
  • the inductance compensators 120a and Lc are provided inside the connection conductor 110 to compensate for the inductance of the junction box 200. That is, the inductance compensator 120a receives the inductance and capacitance of the underground transmission cable and the inductance and capacitance of the junction box 200, calculates a compensation value for compensating the inductance of the junction box 200, and applies a compensation value. By doing so, the characteristic impedance of the underground power transmission cable and the characteristic impedance of the junction box 200 are kept the same. At this time, a method of calculating the inductance, capacitance and characteristic impedance of the underground power transmission cable will be described in detail with reference to FIG. 6.
  • the inductance compensation unit 120a may include a first input unit 121a, an inductance compensation value calculating unit 122a, and an inductance compensation value applying unit 123a.
  • the first input unit 121a receives the inductance and capacitance of the underground transmission cable and the inductance and capacitance of the junction box 200.
  • Inductance compensation value calculation unit 122a is a characteristic impedance of the underground transmission cable including the inductance and capacitance of the underground transmission cable and the inductance difference appearing in the characteristic impedance of the junction box 200 including the inductance and capacitance of the junction box 200. The value is calculated as an inductance compensation value that compensates for the inductance of the junction box 200.
  • the inductance compensation value applying unit 123a maintains the characteristic impedance of the underground transmission cable and the characteristic impedance of the junction box 200 by applying the inductance compensation value.
  • the conductor fixing part 115 is provided at both sides of the connecting conductor part 110, as shown in FIG. That is, the conductor fixing part 115 is fastened and fixed to the external terminal part 240, whereby the connection conductor part 110 and the external terminal part 240 are electrically connected to each other.
  • the shape of the conductor fixing part 115 is illustrated in the form of tongs, but is not limited thereto, and may be variously formed as another type of fixing device that is easy to fix.
  • the outer housing part 130 accommodates the connection conductor part 110 having the inductance compensation part 120a therein.
  • the outer housing portion 9130 is preferably formed of an insulating material.
  • the device 100a for compensating the inductance may be a spiral wire such as a braided wire that matches the inductance compensation value without the outer housing 130.
  • the apparatus 100b for compensating capacitance according to the present invention is largely connected to the connection conductor 110, the capacitance compensator 120b, the conductor fixing part 115, and the outer housing part ( 130).
  • connection conductor unit 110 is electrically connected to the external terminal unit 240 of the underground power transmission cable connection box 200.
  • the configuration of the junction box 200 as shown in Figure 8, the underground power transmission cable junction box 200 inside the conductor 210 for the cable connection is a sleeve connection, the cable 230 sheathing the outer shell
  • the stress cone 225 is installed in the insulator 220 including the outer semiconducting layer for the purpose of mitigating the electric field distribution.
  • cross-bonding is performed between the outer terminal portion of the wound box 200 through the outer terminal portion 240 which is connected to the conductor 210 and exposed to the outside.
  • the capacitance compensators 120b and Cc are provided inside the connection conductor 110 to compensate for the inductance of the junction box 200. That is, the inductance compensator 120b receives the inductance and capacitance of the underground power transmission cable and the inductance and capacitance of the junction box 200, calculates a compensation value for compensating the capacitance of the junction box 200, and applies a compensation value. Therefore, the characteristic impedance of the underground power transmission cable and the characteristic impedance of the junction box 200 are kept the same. At this time, a method of calculating the inductance, capacitance and characteristic impedance of the underground power transmission cable will be described in detail with reference to FIG. 6.
  • the capacitance compensation unit 120b may include a second input unit 121b, a capacitance compensation value calculating unit 122b, and a capacitance compensation value applying unit 123b.
  • the second input unit 121b receives the inductance and capacitance of the underground transmission cable and the inductance and capacitance of the junction box 200.
  • Capacitance compensation value calculating unit 122b is a capacitance difference that appears in the characteristic impedance of the underground transmission cable including the inductance and the capacitance of the underground transmission cable and the characteristic impedance of the junction box 200 including the inductance and capacitance of the junction box 200. The value is calculated as a capacitance compensation value that compensates for the capacitance of the junction box 200.
  • the capacitance compensation value applying unit 123b applies the capacitance compensation value to maintain the same characteristic impedance of the underground power transmission cable and the characteristic impedance of the junction box 200.
  • the conductor fixing part 115 has the same configuration as the conductor fixing part employed in the apparatus 100a for compensating the inductance described above.
  • the outer housing part 130 accommodates the connection conductor part 110 having the capacitance compensation part 120b therein. At this time, the outer housing 130 is preferably formed of an insulating material.
  • FIG. 6 is a diagram illustrating a cable to explain a method of calculating inductance, capacitance, and characteristic impedance of an underground power transmission cable according to an exemplary embodiment of the present invention.
  • Equation 1 the impedance per unit length is represented by Equation 1 below and Is calculated by Equation 2.
  • Equation 3 the characteristic impedance is calculated by Equation 3 below.
  • the cable is composed of a conductor, b insulator, c sheath, and d is a corrosion protection layer, and the inductance, capacitance, and characteristic impedance of the cable are respectively expressed by Equations 4, 5, and 6 below. Is calculated by
  • Inductance, capacitance, and characteristic impedance of the junction box 200 are calculated by Equations 7,8, and 9, respectively.
  • the inductance of the junction box 200 calculated by the above equation is generally larger than the inductance of the cable, while the capacitance of the junction box 200 is smaller than the capacitance of the cable. Therefore, since the characteristic impedance in the junction box 200 is larger than the characteristic impedance of the cable, the inductance compensation value and the capacitance compensation value between the cable and the junction box 200 to compensate for this are calculated by Equations 10 and 11 below. .
  • ⁇ 0 is the permeability in air
  • ⁇ 0 is the dielectric constant in air
  • ⁇ s is the dielectric constant of the insulator
  • r a1 is the cable conductor radius
  • r a2 is the cable insulator radius
  • r b1 is the junction box radius
  • r b2 is the junction box insulator Radius
  • L 1 is the cable inductance
  • C 1 is the cable capacitance
  • Z 1 is the cable characteristic impedance
  • L 2 is the junction inductance
  • C 2 is the junction capacitance
  • Z 2 is the junction characteristic impedance.
  • FIG. 9 is a flowchart illustrating a method for compensating for inductance or capacitance of an underground power transmission cable junction box according to an exemplary embodiment of the present invention.
  • the method for compensating the inductance or capacitance of the underground power transmission cable junction box 200 includes a connection conductor electrically connected to an external terminal of the underground power transmission cable junction box 200 described above.
  • a method of compensating for the inductance or capacitance of the underground power transmission cable junction box 200 including a compensating part provided therein and compensating for the inductance L or the capacitance C of the junction box 200. The description will be omitted.
  • the inductance and capacitance of the underground transmission cable and the inductance and capacitance of the junction box 200 are received.
  • a compensation value for compensating for inductance or capacitance of the junction box 200 is calculated.
  • the inductance compensator 120a connects the characteristic impedance of the underground transmission cable including the inductance and the capacitance of the underground transmission cable.
  • the inductance difference value represented by the characteristic impedance of the junction box 200 including the inductance and the capacitance of the box 200 is calculated as an inductance compensation value that compensates for the inductance of the junction box 200.
  • the capacitance compensation unit 120b is a capacitance difference in the characteristic impedance of the underground transmission cable including the inductance and capacitance of the underground power transmission cable and the characteristic impedance of the junction box 200 including the inductance and capacitance of the junction box 200.
  • the value is calculated as a capacitance compensation value that compensates for the capacitance of the junction box 200.
  • the inductance compensation unit 120a applies the calculated inductance compensation value, the capacitance
  • the compensator 120b maintains the characteristic impedance of the underground transmission cable and the characteristic impedance of the junction box 200 by applying the calculated capacitance compensation value.
  • 10 and 11 are graphs analyzing the propagation wave characteristics before and after applying an apparatus for compensating for inductance or capacitance of an underground transmission cable junction box according to an exemplary embodiment of the present invention. At this time, the empirical test necessary for the verification of the device for compensating the inductance or capacitance of the underground power transmission cable junction box 200 is not possible. Was performed.
  • FIG. 10 the effect of the transmission and reflection of the traveling wave is shown in the junction box 200 in the case of a simple direct connection at the cross-bond point.
  • FIG. 11 the transmission and reflection in the junction box 200 in the case of the direct connection using the compensation inductance and capacitance are illustrated in FIG. 11. It can be seen that the effect of reflection does not appear.

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  • Engineering & Computer Science (AREA)
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  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

The present invention relates to a device for compensating for an inductance or a capacitance of an underground power transmission cable joint box and a method therefor, the device comprising: a connection conductive part electrically connected to an external terminal part of the underground power transmission cable joint box; and a compensation unit provided inside the connection conductive part to compensate for the inductance (L) or the capacitance (C) of the joint box, wherein the compensation unit receives the inductance and the capacitance of the underground power transmission cable and the inductance and the capacitance of the joint box, calculates a compensation value for compensating for the inductance or the capacitance of the joint box, and applies the compensation value, thereby maintaining a characteristic impedance of the underground power transmission cable and a characteristic impedance of the joint box to be the same.

Description

지중 송전 케이블 접속함의 인덕턴스 또는 커패시턴스를 보상하는 장치 및 그 방법Apparatus and method for compensating for inductance or capacitance of underground transmission cable junction box
본 발명은 지중 송전 케이블 접속함의 인덕턴스 또는 커패시턴스를 보상하는 장치 및 그 방법(APPARATUS AND METHOD FOR INDUCTANCE OR CAPACITANCE COMPENSATION OF UNDERGROUND TRANSMISSION CABLE JOINT BOX)에 관한 것으로, 보다 상세하게는 지중 송전 케이블에서 진행파 특성을 이용한 고장 또는 부분방전 지점 탐지시, 접속함에서 발생하는 진행파의 투과 및 반사 영향을 제거하기 위한 지중 송전 케이블 접속함의 인덕턴스 또는 커패시턴스를 보상하는 장치 및 그 방법을 제공한다.The present invention relates to an apparatus for compensating the inductance or capacitance of an underground transmission cable junction box and a method thereof, and more particularly, to using a traveling wave characteristic in an underground transmission cable. An apparatus and method for compensating for inductance or capacitance of an underground transmission cable junction box to eliminate the transmission and reflection effects of traveling waves occurring in a junction box upon detecting a failure or partial discharge point.
일반적으로, 지중 송전 케이블을 연결해주는 중간 접속함의 경우에는 공장에서 성형 제작된 후에 현장에서 케이블 선로와 조립된다. 또한, 해당 접속함이 해당 케이블과 조립되어 지면, 케이블 선로에 대한 진행파 특성을 이용하여 고장 또는 부분방전 지점을 탐지 시험을 수행하게 된다. In general, the intermediate junction box connecting the underground transmission cable is molded in the factory and then assembled with the cable line in the field. In addition, when the junction box is assembled with the cable, a detection test is performed on the point of failure or partial discharge by using the propagation wave characteristics of the cable line.
보다 자세하게는, 케이블 선로에서 진행파가 진행될 경우 특성임피던스가 변화하는 변이점에서 진행파에 대한 투과 및 반사가 발생하게 되는데, 이렇게 변이점에서 되돌아오는 반사파와 입사파의 지연시간을 측정하여 고장 또는 부분방전 지점을 탐지하게 된다.More specifically, when the traveling wave progresses in the cable line, transmission and reflection of the traveling wave occurs at the transition point at which the characteristic impedance changes. Thus, by measuring the delay time of the reflected wave and the incident wave returning from the transition point, the failure or partial discharge is measured. Detect the point.
그러나 이러한 진행파를 이용한 고장 또는 부분방전 지점 탐지시, 접속함의 크로스본딩 영향으로 시스(Sheath)의 연결 상이 변화되면서 특성임피던스에 영향을 주어, 신호가 불규칙해져 접속함에서 발생하는 진행파의 투과 및 반사 영향을 정확하게 관측하기 어려운 문제점이 있었다. However, when detecting a fault or partial discharge point using such traveling wave, the cross-bonding effect of the junction box affects the characteristic impedance as the connection phase of the sheath changes, so that the signal becomes irregular and the transmission and reflection effect of the traveling wave generated from the junction box There was a problem that is difficult to observe accurately.
또한, 접속함과 케이블 선로의 특성임피던스 차이로 인해 접속함에서도 투과 및 반사가 발생하여 이 지점에서 반사되는 신호를 고장 또는 부분방전 지점에서 반사되는 신호로 오판하거나, 입사파의 신호가 접속함에서 반사되면서 투과되는 신호의 크기가 약화 되면서 접속함 이후에 고장 또는 부분방전 지점이 존재할 경우 고장 또는 부분방전 지점에서 반사되는 신호는 더욱 약화 되어 경우에 따라 정확한 신호 관측이 어려운 문제점이 있었다.In addition, due to the difference in the impedance between the junction box and the cable line, transmission and reflection occur in the junction box, so that the signal reflected at this point is misjudged as a signal reflected at the point of failure or partial discharge, or the incident wave signal As the size of the transmitted signal is reduced while the reflection is weakened, if a failure or partial discharge point exists after the connection, the signal reflected from the failure or partial discharge point is further weakened, which makes it difficult to accurately observe the signal in some cases.
따라서, 상기한 문제점을 개선하기 위하여, 한국등록특허 10-08667512에는 접속함에 부분 방전 전류 루프의 전체 임피던스를 조정하는 회로를 구비하여 부분 방전 전류 루프의 전체 임피던스가 최대한 가장 작은 값을 가지도록 함으로써, 부분 방전 신호의 검출 감도를 향상시키는 발명이 개시되어 있으나, 이는 접속함과 케이블 선로의 인덕턴스(L) 또는 커패시턴스(C) 보상 없이 전체 임피던스를 최소화하는데에는 한계가 있다.Therefore, in order to improve the above problem, Korean Patent Registration No. 10-08667512 includes a circuit for adjusting the overall impedance of the partial discharge current loop in the junction box so that the total impedance of the partial discharge current loop has the smallest value as much as possible. Although the invention improves the detection sensitivity of the partial discharge signal, this is limited in minimizing the overall impedance without compensating the inductance (L) or capacitance (C) of the junction box and the cable line.
본 발명은 상기와 같은 문제점을 해결하기 위해 발명된 것으로서, 접속함의 인덕턴스(L) 또는 커패시턴스(C) 값을 보상하여 케이블 선로의 특성임피던스와 동일하게 유지시켜줌으로써, 접속함에서 발생하는 진행파의 투과 및 반사 영향을 제거할 수 있는 지중 송전 케이블 접속함의 인덕턴스 또는 커패시턴스를 보상하는 장치 및 그 방법을 제공하는데 그 목적이 있다.The present invention has been invented to solve the above problems, by compensating the inductance (L) or capacitance (C) value of the junction box to maintain the same as the characteristic impedance of the cable line, the transmission of the traveling wave generated in the junction box And an apparatus and method for compensating for inductance or capacitance of an underground power transmission cable junction box that can eliminate reflection influences.
따라서, 본 발명은 접속함에서 발생하는 진행파의 투과 및 반사 영향을 제거함으로써, 접속함에서 반사되는 신호를 고장 또는 부분방전 지점에서 반사되는 신호로 오판할 수 있는 가능성을 최소화할 수 있는 지중 송전 케이블 접속함의 인덕턴스 또는 커패시턴스를 보상하는 장치 및 그 방법을 제공하는데 그 목적이 있다.Accordingly, the present invention eliminates the transmission and reflection effects of traveling waves generated in the junction box, thereby minimizing the possibility of misjudging the signal reflected in the junction box as the signal reflected at the point of failure or partial discharge. It is an object of the present invention to provide an apparatus and a method for compensating for inductance or capacitance of a junction box.
또한, 본 발명은 접속함에서 발생하는 진행파의 투과 및 반사 영향을 제거함으로써, 고장 또는 부분방전 지점에서 반사되는 신호의 파형 관측이 용이해져 보다 정확한 고장 또는 부분방전 지점을 탐지할 수 있는 지중 송전 케이블 접속함의 인덕턴스 또는 커패시턴스를 보상하는 장치 및 그 방법을 제공하는데 그 목적이 있다.In addition, the present invention eliminates the transmission and reflection influence of the traveling wave generated in the junction box, it is easy to observe the waveform of the signal reflected from the failure or partial discharge point underground transmission cable that can detect more accurate failure or partial discharge point It is an object of the present invention to provide an apparatus and a method for compensating for inductance or capacitance of a junction box.
또한, 본 발명은 지중 송전 케이블의 특성에 따라 보상된 인덕턴스 또는 커패시턴스를 적절히 선택 적용할 수 있는 지중 송전 케이블 접속함의 인덕턴스 또는 커패시턴스를 보상하는 장치 및 그 방법을 제공하는데 그 목적이 있다.In addition, an object of the present invention is to provide an apparatus and a method for compensating for inductance or capacitance of an underground transmission cable junction box capable of appropriately applying the inductance or capacitance compensated according to the characteristics of the underground transmission cable.
상기한 목적을 달성하기 위한 본 발명에 따른 지중 송전 케이블 접속함의 인덕턴스 또는 커패시턴스를 보상하는 장치는 지중 송전 케이블 접속함의 외부 단자부와 전기적으로 연결되는 연결 도체부; 및 상기 연결 도체부의 내부에 구비되어, 상기 접속함의 인덕턴스(L) 또는 커패시턴스(C)를 보상하는 보상부;를 포함하며, 상기 보상부는, 상기 지중 송전 케이블의 인덕턴스 및 커패시턴스와 상기 접속함의 인덕턴스 및 커패시턴스를 입력받아, 상기 접속함의 인덕턴스 또는 커패시턴스를 보상하는 보상값을 산출하고, 상기 보상값을 적용하여 상기 지중 송전 케이블의 특성임피던스와 상기 접속함의 특성임피던스를 동일하게 유지시키는 것을 특징으로 한다.The apparatus for compensating the inductance or capacitance of the underground power transmission cable junction box according to the present invention for achieving the above object comprises: a connecting conductor portion electrically connected to an external terminal portion of the underground power transmission cable junction box; And a compensating part provided inside the connection conductor part to compensate for inductance L or capacitance C of the junction box, wherein the compensating part includes an inductance and capacitance of the underground transmission cable and an inductance of the junction box and The capacitance is input to calculate a compensation value for compensating for inductance or capacitance of the junction box, and applying the compensation value to maintain the characteristic impedance of the underground power transmission cable and the characteristic impedance of the junction box.
또한, 상기 보상부는, 상기 접속함의 인덕턴스를 보상하는 인덕턴스 보상부 또는 상기 접속함의 커패시턴스를 보상하는 커패시턴스 보상부로 이루어지는 것을 특징으로 한다.The compensator may include an inductance compensator for compensating the inductance of the junction box or a capacitance compensator for compensating the capacitance of the junction box.
또한, 상기 인덕턴스 보상부는, 상기 지중 송전 케이블의 인덕턴스 및 커패시턴스와 상기 접속함의 인덕턴스 및 커패시턴스를 입력받는 제1 입력부; 상기 지중 송전 케이블의 인덕턴스 및 커패시턴스를 포함하는 상기 지중 송전 케이블의 특성임피던스와 상기 접속함의 인덕턴스 및 커패시턴스를 포함하는 상기 접속함의 특성임피던스에서 나타나는 인덕턴스 차이값을 상기 접속함의 인덕턴스를 보상하는 인덕턴스 보상값으로 산출하는 인덕턴스 보상값 산출부; 및 상기 인덕턴스 보상값을 적용하여 상기 지중 송전 케이블의 특성임피던스와 상기 접속함의 특성임피던스를 동일하게 유지시키는 인덕턴스 보상값 적용부를 포함하는 것을 특징으로 한다.The inductance compensator may include a first input unit configured to receive an inductance and a capacitance of the underground power transmission cable and an inductance and a capacitance of the junction box; The difference in inductance appearing in the characteristic impedance of the underground transmission cable including the inductance and the capacitance of the underground transmission cable and the characteristic impedance of the junction box including the inductance and the capacitance of the junction box as an inductance compensation value for compensating the inductance of the junction box. An inductance compensation value calculating unit for calculating; And an inductance compensation value applying unit configured to maintain the characteristic impedance of the underground transmission cable and the characteristic impedance of the junction box by applying the inductance compensation value.
또한, 상기 커패시턴스 보상부는, 상기 지중 송전 케이블의 인덕턴스 및 커패시턴스와 상기 접속함의 인덕턴스 및 커패시턴스를 입력받는 제2 입력부; 상기 지중 송전 케이블의 인덕턴스 및 커패시턴스를 포함하는 상기 지중 송전 케이블의 특성임피던스와 상기 접속함의 인덕턴스 및 커패시턴스를 포함하는 상기 접속함의 특성임피던스에서 나타나는 커패시턴스 차이값을 상기 접속함의 커패시턴스를 보상하는 커패시턴스 보상값으로 산출하는 커패시턴스 보상값 산출부; 및 상기 커패시턴스 보상값을 적용하여 상기 지중 송전 케이블의 특성임피던스와 상기 접속함의 특성임피던스를 동일하게 유지시키는 커패시턴스 보상값 적용부를 포함하는 것을 특징으로 한다.The capacitance compensator may include a second input unit configured to receive an inductance and a capacitance of the underground power transmission cable and an inductance and a capacitance of the junction box; The capacitance difference value represented by the characteristic impedance of the underground transmission cable including the inductance and capacitance of the underground transmission cable and the characteristic impedance of the junction box including the inductance and capacitance of the junction box as a capacitance compensation value for compensating the capacitance of the junction box. A capacitance compensation value calculating unit for calculating; And a capacitance compensation value applying unit for applying the capacitance compensation value to keep the characteristic impedance of the underground power transmission cable and the characteristic impedance of the junction box the same.
그리고 상기 연결 도체부와 상기 외부 단자부의 전기적 연결은 상기 외부 단자부에 상기 연결 도체부의 양측에 구비되는 도체 고정부가 체결 고정되어 이루어지는 것을 특징으로 한다.And the electrical connection of the connection conductor portion and the external terminal portion is characterized in that the conductor fixing parts provided on both sides of the connection conductor portion is fastened and fixed to the external terminal portion.
이때, 상기 도체 고정부는 집게형태로 형성되는 것을 특징으로 한다.At this time, the conductor fixing is characterized in that it is formed in the form of tongs.
그리고 상기 연결 도체부를 수용하는 하우징부를 더 포함하는 것을 특징으로 한다.And a housing part for accommodating the connection conductor part.
이때, 상기 하우징부는 절연 물질로 형성되는 것을 특징으로 한다.In this case, the housing portion is formed of an insulating material.
상기한 목적을 달성하기 위한 본 발명에 따른 지중 송전 케이블 접속함의 인덕턴스 또는 커패시턴스를 보상하는 방법은 지중 송전 케이블 접속함의 외부 단자부와 전기적으로 연결되는 연결 도체 내부에 구비되어 상기 접속함의 인덕턴스(L) 또는 커패시턴스(C)를 보상하는 보상부를 포함하는 지중 송전 케이블 접속함의 인덕턴스 또는 커패시턴스를 보상하는 장치의 보상 방법에 있어서, 상기 보상부에 의해, 상기 지중 송전 케이블의 인덕턴스 및 커패시턴스와 상기 접속함의 인덕턴스 및 커패시턴스를 입력받는 단계; 상기 보상부에 의해, 상기 접속함의 인덕턴스 또는 커패시턴스를 보상하는 보상값을 산출하는 단계; 및 상기 보상부에 의해, 상기 보상값을 적용하여 상기 지중 송전 케이블의 특성임피던스와 상기 접속함의 특성임피던스를 동일하게 유지시키는 단계를 포함하는 것을 특징으로 한다.The method for compensating the inductance or capacitance of the underground power transmission cable junction box according to the present invention for achieving the above object is provided inside the connection conductor electrically connected to the external terminal portion of the underground power transmission cable junction box or the inductance (L) of the junction box or A method of compensating for an inductance or capacitance of an underground power transmission cable junction box including a compensating unit for compensating capacitance (C), the method of compensating for an inductance and capacitance of the underground power transmission cable and the inductance and capacitance of the junction box by the compensation unit. Receiving an input; Calculating, by the compensation unit, a compensation value for compensating for inductance or capacitance of the junction box; And by the compensating unit, applying the compensation value to keep the characteristic impedance of the underground power transmission cable and the characteristic impedance of the junction box the same.
또한, 상기 보상부는 상기 접속함의 인덕턴스를 보상하는 인덕턴스 보상부 또는 상기 접속함의 커패시턴스를 보상하는 커패시턴스 보상부로 이루어지는 것을 특징으로 한다.The compensator may include an inductance compensator for compensating the inductance of the junction box or a capacitance compensator for compensating the capacitance of the junction box.
그리고 상기 보상값을 산출하는 단계에서, 상기 인덕턴스 보상부는 상기 지중 송전 케이블의 인덕턴스 및 커패시턴스를 포함하는 상기 지중 송전 케이블의 특성임피던스와 상기 접속함의 인덕턴스 및 커패시턴스를 포함하는 상기 접속함의 특성임피던스에서 나타나는 인덕턴스 차이값을 상기 접속함의 인덕턴스를 보상하는 인덕턴스 보상값으로 산출하는 것을 특징으로 한다.And in the calculating of the compensation value, the inductance compensator includes the characteristic impedance of the underground transmission cable including the inductance and the capacitance of the underground transmission cable and the inductance appearing in the characteristic impedance of the junction box including the inductance and capacitance of the junction box. The difference value is calculated as an inductance compensation value for compensating for the inductance of the junction box.
그리고 상기 케이블의 특성임피던스와 상기 접속함의 특성임피던스를 동일하게 유지시키는 단계에서, 상기 인덕턴스 보상부는 상기 인덕턴스 보상값을 적용하는 것을 특징으로 한다.And in the step of maintaining the characteristic impedance of the cable and the characteristic impedance of the junction box, the inductance compensation unit is characterized in that for applying the inductance compensation value.
그리고 상기 보상값을 산출하는 단계에서, 상기 커패시턴스 보상부는 상기 지중 송전 케이블의 인덕턴스 및 커패시턴스를 포함하는 상기 지중 송전 케이블의 특성임피던스와 상기 접속함의 인덕턴스 및 커패시턴스를 포함하는 상기 접속함의 특성임피던스에서 나타나는 커패시턴스 차이값을 상기 접속함의 커패시턴스를 보상하는 커패시턴스 보상값으로 산출하는 것을 특징으로 한다.And in the calculating of the compensation value, the capacitance compensator includes a characteristic impedance of the underground transmission cable including an inductance and a capacitance of the underground transmission cable and a capacitance appearing in a characteristic impedance of the junction box including an inductance and a capacitance of the junction box. The difference value is calculated as a capacitance compensation value for compensating for the capacitance of the junction box.
그리고 상기 케이블의 특성임피던스와 상기 접속함의 특성임피던스를 동일하게 유지시키는 단계에서, 상기 커패시턴스 보상부는 상기 커패시턴스 보상값을 적용하는 것을 특징으로 한다.And in the step of maintaining the characteristic impedance of the cable and the characteristic impedance of the junction box, the capacitance compensation unit is characterized in that for applying the capacitance compensation value.
상기와 같은 구성을 갖는 본 발명에 의한 지중 송전 케이블 접속함의 인덕턴스 또는 커패시턴스를 보상하는 장치 및 그 방법은 접속함의 인덕턴스(L) 또는 커패시턴스(C) 값을 보상하여 케이블 선로의 특성임피던스와 동일하게 유지시켜줌으로써, 접속함에서 발생하는 진행파의 투과 및 반사 영향을 제거할 수 있는 효과가 있다.Apparatus and method for compensating for inductance or capacitance of underground transmission cable junction box according to the present invention having the configuration as described above are compensated for the inductance (L) or capacitance (C) value of the junction box to maintain the same as the characteristic impedance of the cable line By doing so, it is possible to eliminate the transmission and reflection effects of the traveling wave generated in the junction box.
따라서, 본 발명은 접속함에서 반사되는 신호를 고장 또는 부분방전 지점에서 반사되는 신호로 오판할 수 있는 가능성이 최소화됨으로써, 고장 또는 부분방전 지점에서 반사되는 신호의 파형 관측이 용이해져 보다 정확한 고장 또는 부분방전 지점을 탐지할 수 있는 효과가 있다.Accordingly, the present invention minimizes the possibility of misjudging a signal reflected in a junction box as a signal reflected at a failure or partial discharge point, thereby making it easier to observe a waveform of a signal reflected at the failure or partial discharge point, thereby making it more accurate. It has the effect of detecting the partial discharge point.
그리고 본 발명은 지중 송전 케이블의 특성에 따라 보상된 인덕턴스 또는 커패시턴스를 적절히 선택 적용할 수 있는 효과가 있다.In addition, the present invention has an effect that can be appropriately applied to the inductance or capacitance compensated according to the characteristics of the underground power transmission cable.
도 1은 본 발명의 실시예에 따른 지중 송전 케이블 접속함의 인덕턴스를 보상하는 장치의 모습을 도시한 단면도이다.1 is a cross-sectional view showing the appearance of a device for compensating the inductance of the underground power cable connection box according to an embodiment of the present invention.
도 2는 본 발명의 실시예에 따른 지중 송전 케이블 접속함의 인덕턴스를 보상하는 장치의 인덕턴스 보상부에 대한 구성도이다.2 is a block diagram of an inductance compensator of an apparatus for compensating for inductance of an underground power transmission cable connection box according to an exemplary embodiment of the present invention.
도 3은 본 발명의 실시예에 따른 지중 송전 케이블 접속함의 인덕턴스를 보상하는 장치에 채용되는 연결고정부의 모습을 도시한 단면도이다.3 is a cross-sectional view showing a state of the connection fixing employed in the device for compensating the inductance of the underground power transmission cable connection box according to an embodiment of the present invention.
도 4는 본 발명의 실시예에 따른 지중 송전 케이블 접속함의 커패시턴스를 보상하는 장치의 모습을 도시한 단면도이다.4 is a cross-sectional view showing an apparatus for compensating for capacitance of an underground power transmission cable connection box according to an exemplary embodiment of the present invention.
도 5는 본 발명의 실시예에 따른 지중 송전 케이블 접속함의 커패시턴스를 보상하는 장치의 커패시턴스 보상부에 대한 구성도이다.5 is a block diagram of a capacitance compensation unit of the device for compensating for the capacitance of the underground power cable connection box according to an embodiment of the present invention.
도 6은 본 발명의 실시예에 따른 케이블을 도시한 단면도이다.6 is a cross-sectional view showing a cable according to an embodiment of the present invention.
도 7은 본 발명의 실시예에 따른 지중 송전 케이블 접속함의 인덕턴스를 보상하는 장치가 지중 송전 케이블 접속함에 연결 고정된 모습을 도시한 단면도이다.FIG. 7 is a cross-sectional view illustrating a state in which an apparatus for compensating for inductance of an underground power transmission cable junction box is connected and fixed to the underground power transmission cable junction box.
도 8은 본 발명의 실시예에 따른 지중 송전 케이블 접속함의 커패시턴스를 보상하는 장치가 지중 송전 케이블 접속함에 연결 고정된 모습을 도시한 단면도이다.8 is a cross-sectional view illustrating a state in which an apparatus for compensating capacitance of an underground power transmission cable junction box is connected and fixed to the underground transmission cable junction box according to an embodiment of the present invention.
도 9는 본 발명의 실시예에 따른 지중 송전 케이블 접속함의 인덕턴스 또는 커패시턴스를 보상하는 방법에 대한 순서도이다.9 is a flowchart illustrating a method for compensating for inductance or capacitance of an underground power transmission cable junction box according to an exemplary embodiment of the present invention.
도 10은 본 발명의 실시예에 따른 지중 송전 케이블 접속함의 인덕턴스 또는 커패시턴스를 보상하는 장치 적용 전의 진행파 특성을 분석한 그래프이다.10 is a graph analyzing the traveling wave characteristics before applying the device for compensating the inductance or capacitance of the underground power cable connection box according to an embodiment of the present invention.
도 11은 본 발명의 실시예에 따른 지중 송전 케이블 접속함의 인덕턴스 또는 커패시턴스를 보상하는 장치 적용 후의 진행파 특성을 분석한 그래프이다.11 is a graph analyzing the traveling wave characteristics after application of a device for compensating for inductance or capacitance of an underground power transmission cable connection box according to an exemplary embodiment of the present invention.
이하, 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자가 본 발명의 기술적 사상을 용이하게 실시할 수 있을 정도로 상세히 설명하기 위하여, 본 발명의 가장 바람직한 실시예를 첨부 도면을 참조하여 설명하기로 한다. 우선, 각 도면의 구성요소들에 참조부호를 부가함에 있어서, 동일한 구성요소들에 대해서는 비록 다른 도면상에 표시되더라도 가능한 한 동일한 부호를 가지도록 하고 있음에 유의해야 한다. 또한, 본 발명을 설명함에 있어, 관련된 공지 구성 또는 기능에 대한 구체적인 설명이 본 발명의 요지를 흐릴 수 있다고 판단되는 경우에는 그 상세한 설명은 생략한다.Hereinafter, the preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the technical idea of the present invention. . First, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are designated as much as possible even if displayed on different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.
이하, 본 발명의 실시예에 따른 지중 송전 케이블 접속함의 인덕턴스 또는 커패시턴스를 보상하는 장치 및 그 방법에 대하여 첨부한 도면을 참고로 하여 상세히 설명한다.Hereinafter, an apparatus and a method for compensating for inductance or capacitance of an underground power transmission cable connection box according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
도 1은 본 발명의 실시예에 따른 지중 송전 케이블 접속함의 인덕턴스를 보상하는 장치의 모습을 도시한 단면도이고, 도 2는 본 발명의 실시예에 따른 지중 송전 케이블 접속함의 인덕턴스를 보상하는 장치의 인덕턴스 보상부에 대한 구성도이고, 도 3은 본 발명의 실시예에 따른 지중 송전 케이블 접속함의 인덕턴스를 보상하는 장치에 채용되는 연결고정부의 모습을 도시한 단면도이고, 도 4는 본 발명의 실시예에 따른 지중 송전 케이블 접속함의 커패시턴스를 보상하는 장치의 모습을 도시한 단면도이고, 도 5는 본 발명의 실시예에 따른 지중 송전 케이블 접속함의 커패시턴스를 보상하는 장치의 커패시턴스 보상부에 대한 구성도이고, 도 6은 본 발명의 실시예에 따른 케이블을 도시한 단면도이고, 도 7은 본 발명의 실시예에 따른 지중 송전 케이블 접속함의 인덕턴스를 보상하는 장치가 지중 송전 케이블 접속함에 연결 고정된 모습을 도시한 단면도이고, 도 8은 본 발명의 실시예에 따른 지중 송전 케이블 접속함의 커패시턴스를 보상하는 장치가 지중 송전 케이블 접속함에 연결 고정된 모습을 도시한 단면도이다.1 is a cross-sectional view showing a device for compensating the inductance of the underground power transmission cable junction box according to an embodiment of the present invention, Figure 2 is an inductance of the device for compensating the inductance of the underground power transmission cable junction box according to an embodiment of the present invention. FIG. 3 is a cross-sectional view illustrating a connection fixing part employed in an apparatus for compensating the inductance of an underground power transmission cable connection box according to an embodiment of the present invention, and FIG. 4 is an embodiment of the present invention. FIG. 5 is a cross-sectional view illustrating an apparatus for compensating capacitance of an underground power transmission cable junction box according to an embodiment of the present invention, and FIG. 5 is a configuration diagram of a capacitance compensation unit of an apparatus for compensating capacitance of an underground power transmission cable junction box according to an embodiment of the present invention. 6 is a cross-sectional view showing a cable according to an embodiment of the present invention, Figure 7 is a ground power transmission cable contact according to an embodiment of the present invention FIG. 8 is a cross-sectional view illustrating a device of compensating for inductance of a subordinate box connected to an underground power transmission cable junction box. FIG. 8 is a view illustrating an apparatus for compensating for capacitance of an underground power transmission cable junction box according to an embodiment of the present invention. It is sectional drawing which shows the fixed state.
여기서, 본 발명에 따른 지중 송전 케이블 접속함의 인덕턴스 또는 커패시턴스를 보상하는 장치(100a, 100b)는 크게 연결 도체부(110), 보상부(120a, 120b) 및 도체 고정부(115)를 포함하여 이루어지는 것으로, 보상부(120a, 120b)의 구성에 따라 지중 송전 케이블 접속함의 인덕턴스를 보상하는 장치(100a)와 지중 송전 케이블 접속함의 커패시턴스를 보상하는 장치(100b)로 구분하여 설명하기로 한다. Here, the device (100a, 100b) for compensating the inductance or capacitance of the underground power transmission cable connection box according to the present invention comprises a connection conductor 110, a compensator (120a, 120b) and a conductor fixing portion (115) In accordance with the configuration of the compensators 120a and 120b, the description will be made by dividing the apparatus 100a for compensating the inductance of the underground power transmission cable junction box and the apparatus 100b for compensating the capacitance of the underground power transmission cable junction box.
즉, 본 발명에 따른 지중 송전 케이블 접속함의 인덕턴스 또는 커패시턴스를 보상하는 장치(100a, 100b)는 케이블의 특성에 따라 인덕턴스를 보상하는 장치(100a)를 채택할 수도 있고, 커패시턴스를 보상하는 장치(100b)를 채택할 수 있다.That is, the device (100a, 100b) for compensating the inductance or capacitance of the underground power transmission cable connection box according to the present invention may adopt the device (100a) for compensating the inductance according to the characteristics of the cable, the device (100b) for compensating capacitance ) Can be adopted.
도 1 및 도 2를 참조하여 설명하면, 본 발명에 따른 인덕턴스를 보상하는 장치(100a)는 크게 연결 도체부(110), 인덕턴스 보상부(120a) 및 도체 고정부(115)를 포함한다.Referring to FIGS. 1 and 2, the apparatus 100a for compensating for inductance according to the present invention includes a connecting conductor part 110, an inductance compensator 120a, and a conductor fixing part 115.
연결 도체부(110)는 지중 송전 케이블 접속함(200)의 외부 단자부(240)와 전기적으로 연결된다. 연결 도체부(110)의 길이는 접속함(200)의 외부 단자부간의 거리에 따라 다르게 형성될 수 있다. 즉, 접속함(200)의 외부 단자부(240)간의 거리가 송전 전압등급 또는 접속함(200)의 종류 등에 따라 다르므로 이에 따라 연결 도체부(110)의 길이도 변경되는 것이 바람직하다.The connection conductor unit 110 is electrically connected to the external terminal unit 240 of the underground power transmission cable connection box 200. The length of the connection conductor part 110 may be formed differently according to the distance between the external terminal parts of the junction box 200. That is, since the distance between the external terminal portion 240 of the junction box 200 varies depending on the transmission voltage rating or the type of the junction box 200, it is preferable that the length of the connection conductor part 110 is changed accordingly.
이때, 접속함(200)의 구성은 도 7에 도시된 바와 같이, 지중 송전 케이블 접속함(200) 내부는 케이블 접속을 위한 도체(210)는 슬리브 접속을 하며, 케이블(230) 외피를 탈피하고 외부 반도전층을 포함하는 절연체(220) 내에 전계 분포 완화의 목적으로 스트레스콘(225)이 설치된다. 또한, 도체(210)와 이어져 외부로 노출되는 외부 단자부(240)를 통해 타상 접속함(200)의 외부 단자부 간에 크로스 본딩이 이루어진다. 이와 같은 인덕턴스를 보상하는 장치(100a)와 연결되는 지중 송전 케이블 접속함(200) 내부의 구성은 캐패시턴스를 보상하는 장치(100b)와 연결되는 지중 송전 케이블 접속함(200) 내부의 구성과 동일하다.At this time, the configuration of the junction box 200, as shown in Figure 7, underground transmission cable junction box 200 inside the conductor 210 for the cable connection is connected to the sleeve, the cable 230 sheathing the outer shell The stress cone 225 is installed in the insulator 220 including the outer semiconducting layer for the purpose of mitigating the electric field distribution. In addition, cross-bonding is performed between the outer terminal portion of the wound box 200 through the outer terminal portion 240 which is connected to the conductor 210 and exposed to the outside. The configuration of the underground power transmission cable junction box 200 connected to the device 100a compensating for such inductance is the same as the configuration of the underground transmission cable junction box 200 connected to the device 100b compensating capacitance. .
인덕턴스 보상부(120a,Lc)는 연결 도체부(110)의 내부에 구비되어, 접속함(200)의 인덕턴스를 보상한다. 즉, 인덕턴스 보상부(120a)는 지중 송전 케이블의 인덕턴스 및 커패시턴스와 접속함(200)의 인덕턴스 및 커패시턴스를 입력받아, 접속함(200)의 인덕턴스를 보상하는 보상값을 산출하고, 보상값을 적용하여 상기 지중 송전 케이블의 특성임피던스와 상기 접속함(200)의 특성임피던스를 동일하게 유지시킨다. 이때, 지중 송전 케이블의 인덕턴스 및 커패시턴스와 특성임피던스를 계산하는 방법은 이후 도 6을 참조하여 자세하게 설명하기로 한다.The inductance compensators 120a and Lc are provided inside the connection conductor 110 to compensate for the inductance of the junction box 200. That is, the inductance compensator 120a receives the inductance and capacitance of the underground transmission cable and the inductance and capacitance of the junction box 200, calculates a compensation value for compensating the inductance of the junction box 200, and applies a compensation value. By doing so, the characteristic impedance of the underground power transmission cable and the characteristic impedance of the junction box 200 are kept the same. At this time, a method of calculating the inductance, capacitance and characteristic impedance of the underground power transmission cable will be described in detail with reference to FIG. 6.
이를 위해, 인덕턴스 보상부(120a)는 제1 입력부(121a), 인덕턴스 보상값 산출부(122a) 및 인덕턴스 보상값 적용부(123a)로 구성될 수 있다.To this end, the inductance compensation unit 120a may include a first input unit 121a, an inductance compensation value calculating unit 122a, and an inductance compensation value applying unit 123a.
제 1 입력부(121a)는 지중 송전 케이블의 인덕턴스 및 커패시턴스와 접속함(200)의 인덕턴스 및 커패시턴스를 입력받는다.The first input unit 121a receives the inductance and capacitance of the underground transmission cable and the inductance and capacitance of the junction box 200.
인덕턴스 보상값 산출부(122a)는 지중 송전 케이블의 인덕턴스 및 커패시턴스를 포함하는 지중 송전 케이블의 특성임피던스와 접속함(200)의 인덕턴스 및 커패시턴스를 포함하는 접속함(200)의 특성임피던스에서 나타나는 인덕턴스 차이값을 접속함(200)의 인덕턴스를 보상하는 인덕턴스 보상값으로 산출한다.Inductance compensation value calculation unit 122a is a characteristic impedance of the underground transmission cable including the inductance and capacitance of the underground transmission cable and the inductance difference appearing in the characteristic impedance of the junction box 200 including the inductance and capacitance of the junction box 200. The value is calculated as an inductance compensation value that compensates for the inductance of the junction box 200.
인덕턴스 보상값 적용부(123a)는 인덕턴스 보상값을 적용하여 지중 송전 케이블의 특성임피던스와 접속함(200)의 특성임피던스를 동일하게 유지시킨다.The inductance compensation value applying unit 123a maintains the characteristic impedance of the underground transmission cable and the characteristic impedance of the junction box 200 by applying the inductance compensation value.
도체 고정부(115)는 도 3에 도시된 바와 같이, 연결 도체부(110)의 양측에 구비된다. 즉, 도체 고정부(115)가 외부 단자부(240)에 체결 고정됨으로써, 연결 도체부(110)와 외부 단자부(240)가 전기적으로 연결된다. 이때, 도체 고정부(115)의 형태는 집게 형태로 도시하였으나, 이에 한정되지 않고 고정이 쉬운 다른 형태의 고정기구로 다양하게 형성될 수 있다.The conductor fixing part 115 is provided at both sides of the connecting conductor part 110, as shown in FIG. That is, the conductor fixing part 115 is fastened and fixed to the external terminal part 240, whereby the connection conductor part 110 and the external terminal part 240 are electrically connected to each other. In this case, the shape of the conductor fixing part 115 is illustrated in the form of tongs, but is not limited thereto, and may be variously formed as another type of fixing device that is easy to fix.
외부 하우징부(130)는 내부에 인덕턴스 보상부(120a)를 구비한 연결 도체부(110)를 수용한다. 이때, 외부 하우징부9130)는 절연 물질로 형성되는 것이 바람직하다. 그러나, 인덕턴스를 보상하는 장치(100a)는 외부 하우징부(130) 없이 인덕턴스 보상값과 일치하는 편조선과 같은 나선형태의 전선으로도 가능하다.The outer housing part 130 accommodates the connection conductor part 110 having the inductance compensation part 120a therein. At this time, the outer housing portion 9130 is preferably formed of an insulating material. However, the device 100a for compensating the inductance may be a spiral wire such as a braided wire that matches the inductance compensation value without the outer housing 130.
도 4 및 도 5에 도시된 바와 같이, 본 발명에 따른 커패시턴스를 보상하는 장치(100b)는 크게 연결 도체부(110), 커패시턴스 보상부(120b), 도체 고정부(115) 및 외부 하우징부(130)를 포함한다.As shown in FIGS. 4 and 5, the apparatus 100b for compensating capacitance according to the present invention is largely connected to the connection conductor 110, the capacitance compensator 120b, the conductor fixing part 115, and the outer housing part ( 130).
연결 도체부(110)는 지중 송전 케이블 접속함(200)의 외부 단자부(240)와 전기적으로 연결된다.The connection conductor unit 110 is electrically connected to the external terminal unit 240 of the underground power transmission cable connection box 200.
이때, 접속함(200)의 구성은 도 8에 도시된 바와 같이, 지중 송전 케이블 접속함(200) 내부는 케이블 접속을 위한 도체(210)는 슬리브 접속을 하며, 케이블(230) 외피를 탈피하고 외부 반도전층을 포함하는 절연체(220) 내에 전계 분포 완화의 목적으로 스트레스콘(225)이 설치된다. 또한, 도체(210)와 이어져 외부로 노출되는 외부 단자부(240)를 통해 타상 접속함(200)의 외부 단자부 간에 크로스 본딩이 이루어진다.At this time, the configuration of the junction box 200, as shown in Figure 8, the underground power transmission cable junction box 200 inside the conductor 210 for the cable connection is a sleeve connection, the cable 230 sheathing the outer shell The stress cone 225 is installed in the insulator 220 including the outer semiconducting layer for the purpose of mitigating the electric field distribution. In addition, cross-bonding is performed between the outer terminal portion of the wound box 200 through the outer terminal portion 240 which is connected to the conductor 210 and exposed to the outside.
커패시턴스 보상부(120b,Cc)는 연결 도체부(110)의 내부에 구비되어, 접속함(200)의 인덕턴스를 보상한다. 즉, 인덕턴스 보상부(120b)는 지중 송전 케이블의 인덕턴스 및 커패시턴스와 접속함(200)의 인덕턴스 및 커패시턴스를 입력받아, 접속함(200)의 커패시턴스를 보상하는 보상값을 산출하고, 보상값을 적용하여 지중 송전 케이블의 특성임피던스와 상기 접속함(200)의 특성임피던스를 동일하게 유지시킨다. 이때, 지중 송전 케이블의 인덕턴스 및 커패시턴스와 특성임피던스를 계산하는 방법은 이후 도 6을 참조하여 자세하게 설명하기로 한다.The capacitance compensators 120b and Cc are provided inside the connection conductor 110 to compensate for the inductance of the junction box 200. That is, the inductance compensator 120b receives the inductance and capacitance of the underground power transmission cable and the inductance and capacitance of the junction box 200, calculates a compensation value for compensating the capacitance of the junction box 200, and applies a compensation value. Therefore, the characteristic impedance of the underground power transmission cable and the characteristic impedance of the junction box 200 are kept the same. At this time, a method of calculating the inductance, capacitance and characteristic impedance of the underground power transmission cable will be described in detail with reference to FIG. 6.
이를 위해, 커패시턴스 보상부(120b)는 제2 입력부(121b), 커패시턴스 보상값 산출부(122b) 및 커패시턴스 보상값 적용부(123b)로 구성될 수 있다.To this end, the capacitance compensation unit 120b may include a second input unit 121b, a capacitance compensation value calculating unit 122b, and a capacitance compensation value applying unit 123b.
제 2 입력부(121b)는 지중 송전 케이블의 인덕턴스 및 커패시턴스와 접속함(200)의 인덕턴스 및 커패시턴스를 입력받는다.The second input unit 121b receives the inductance and capacitance of the underground transmission cable and the inductance and capacitance of the junction box 200.
커패시턴스 보상값 산출부(122b)는 지중 송전 케이블의 인덕턴스 및 커패시턴스를 포함하는 지중 송전 케이블의 특성임피던스와 접속함(200)의 인덕턴스 및 커패시턴스를 포함하는 접속함(200)의 특성임피던스에서 나타나는 커패시턴스 차이값을 접속함(200)의 커패시턴스를 보상하는 커패시턴스 보상값으로 산출한다.Capacitance compensation value calculating unit 122b is a capacitance difference that appears in the characteristic impedance of the underground transmission cable including the inductance and the capacitance of the underground transmission cable and the characteristic impedance of the junction box 200 including the inductance and capacitance of the junction box 200. The value is calculated as a capacitance compensation value that compensates for the capacitance of the junction box 200.
커패시턴스 보상값 적용부(123b)는 커패시턴스 보상값을 적용하여 지중 송전 케이블의 특성임피던스와 접속함(200)의 특성임피던스를 동일하게 유지시킨다.The capacitance compensation value applying unit 123b applies the capacitance compensation value to maintain the same characteristic impedance of the underground power transmission cable and the characteristic impedance of the junction box 200.
도체 고정부(115)는 도 3에 도시된 바와 같이 앞서 설명한 인덕턴스를 보상하는 장치(100a)에 채용되는 도체 고정부와 동일한 구성으로 이루어진다.As illustrated in FIG. 3, the conductor fixing part 115 has the same configuration as the conductor fixing part employed in the apparatus 100a for compensating the inductance described above.
외부 하우징부(130)는 내부에 커패시턴스 보상부(120b)를 구비한 연결 도체부(110)를 수용한다. 이때, 외부 하우징부(130)는 절연 물질로 형성되는 것이 바람직하다.The outer housing part 130 accommodates the connection conductor part 110 having the capacitance compensation part 120b therein. At this time, the outer housing 130 is preferably formed of an insulating material.
도 6은 본 발명의 실시예에 따른 지중 송전 케이블의 인덕턴스 및 커패시턴스와 특성임피던스를 계산하는 방법을 설명하기 위해 케이블을 도시한 도면이다.FIG. 6 is a diagram illustrating a cable to explain a method of calculating inductance, capacitance, and characteristic impedance of an underground power transmission cable according to an exemplary embodiment of the present invention.
도 6을 참조하여 설명하면, 케이블은 단위 길이당 저항을 R, 인덕턴스를 L, 커패시턴스를 C, 누설 콘덕턴스를 G로 정의한다고 할 때, 단위길이 당 임피던스는 아래의 수식 1과 어드민턴스는 아래의 수식 2에 의해 계산된다. Referring to FIG. 6, when a cable defines a resistance per unit length as R, an inductance as L, a capacitance as C, and a leakage conductance as G, the impedance per unit length is represented by Equation 1 below and Is calculated by Equation 2.
[수식 1][Equation 1]
Figure PCTKR2013008419-appb-I000001
Figure PCTKR2013008419-appb-I000001
[수식 2][Formula 2]
Figure PCTKR2013008419-appb-I000002
Figure PCTKR2013008419-appb-I000002
여기서, 특성임피턴스는 아래의 수식 3에 의해 계산된다.Here, the characteristic impedance is calculated by Equation 3 below.
[수식 3][Equation 3]
Figure PCTKR2013008419-appb-I000003
Figure PCTKR2013008419-appb-I000003
도 6에 도시된 바와 같이 케이블은 a는 도체, b는 절연체, c는 시스, d는 방식층으로 이루어지며, 이를 통한 케이블의 인덕턴스, 커패시턴스 및 특성임피던스는 각각 아래의 수식 4,5,6 에 의해 계산된다.As shown in FIG. 6, the cable is composed of a conductor, b insulator, c sheath, and d is a corrosion protection layer, and the inductance, capacitance, and characteristic impedance of the cable are respectively expressed by Equations 4, 5, and 6 below. Is calculated by
[수식 4][Equation 4]
Figure PCTKR2013008419-appb-I000004
Figure PCTKR2013008419-appb-I000004
[수식 5][Equation 5]
Figure PCTKR2013008419-appb-I000005
Figure PCTKR2013008419-appb-I000005
[수식 6][Equation 6]
Figure PCTKR2013008419-appb-I000006
Figure PCTKR2013008419-appb-I000006
그리고 접속함(200)의 인덕턴스, 커패시턴스 및 특성임피던스는 각각 아래의 수식 7,8,9 에 의해 계산된다.Inductance, capacitance, and characteristic impedance of the junction box 200 are calculated by Equations 7,8, and 9, respectively.
[수식 7][Formula 7]
[수식 8] Equation 8
Figure PCTKR2013008419-appb-I000008
Figure PCTKR2013008419-appb-I000008
[수식 9]Equation 9
Figure PCTKR2013008419-appb-I000009
Figure PCTKR2013008419-appb-I000009
상기와 같은 식에 의해 계산된 접속함(200)의 인덕턴스는 일반적으로 케이블의 인덕턴스에 비해 큰 반면에, 접속함(200)의 커패시턴스는 케이블의 커패시턴스에 비해 작다. 따라서, 접속함(200)에서의 특성임피던스는 케이블의 특성임피던스에 비해 크므로 이를 보상하기 위한 케이블과 접속함(200) 간의 인덕턴스 보상값과 커패시턴스 보상값은 아래의 수식 10, 11 에 의해 계산된다.The inductance of the junction box 200 calculated by the above equation is generally larger than the inductance of the cable, while the capacitance of the junction box 200 is smaller than the capacitance of the cable. Therefore, since the characteristic impedance in the junction box 200 is larger than the characteristic impedance of the cable, the inductance compensation value and the capacitance compensation value between the cable and the junction box 200 to compensate for this are calculated by Equations 10 and 11 below. .
[수식 10]Equation 10
Figure PCTKR2013008419-appb-I000010
Figure PCTKR2013008419-appb-I000010
[수식 11][Equation 11]
Figure PCTKR2013008419-appb-I000011
Figure PCTKR2013008419-appb-I000011
여기서, μ0은 공기중의 투자율, ε0은 공기중의 유전율, εs는 절연체 비유전율, ra1은 케이블 도체 반경, ra2는 케이블 절연체 반경, rb1은 접속함 도체 반경, rb2는 접속함 절연체 반경, L1은 케이블 인덕턴스, C1은 케이블 커패시턴스, Z1은 케이블 특성임피던스, L2는 접속함 인덕턴스, C2는 접속함 커패시턴스, Z2는 접속함 특성 임피던스를 나타낸다.Where μ0 is the permeability in air, ε0 is the dielectric constant in air, εs is the dielectric constant of the insulator, r a1 is the cable conductor radius, r a2 is the cable insulator radius, r b1 is the junction box radius, r b2 is the junction box insulator Radius, L 1 is the cable inductance, C 1 is the cable capacitance, Z 1 is the cable characteristic impedance, L 2 is the junction inductance, C 2 is the junction capacitance, and Z 2 is the junction characteristic impedance.
도 9는 본 발명의 실시예에 따른 지중 송전 케이블 접속함의 인덕턴스 또는 커패시턴스를 보상하는 방법에 대한 순서도이다.9 is a flowchart illustrating a method for compensating for inductance or capacitance of an underground power transmission cable junction box according to an exemplary embodiment of the present invention.
도 9를 참조하여 설명하면, 본 발명에 따른 지중 송전 케이블 접속함(200)의 인덕턴스 또는 커패시턴스를 보상하는 방법은 앞서 설명된 지중 송전 케이블 접속함(200)의 외부 단자부와 전기적으로 연결되는 연결 도체 내부에 구비되어 상기 접속함(200)의 인덕턴스(L) 또는 커패시턴스(C)를 보상하는 보상부를 포함하는 지중 송전 케이블 접속함(200)의 인덕턴스 또는 커패시턴스를 보상하는 장치를 이용하는 방법으로, 이하 중복되는 설명은 생략하기로 한다.Referring to FIG. 9, the method for compensating the inductance or capacitance of the underground power transmission cable junction box 200 according to the present invention includes a connection conductor electrically connected to an external terminal of the underground power transmission cable junction box 200 described above. A method of compensating for the inductance or capacitance of the underground power transmission cable junction box 200 including a compensating part provided therein and compensating for the inductance L or the capacitance C of the junction box 200. The description will be omitted.
먼저, 지중 송전 케이블의 인덕턴스 및 커패시턴스와 접속함(200)의 인덕턴스 및 커패시턴스를 입력받는다.(S100)First, the inductance and capacitance of the underground transmission cable and the inductance and capacitance of the junction box 200 are received.
다음, 접속함(200)의 인덕턴스 또는 커패시턴스를 보상하는 보상값을 산출한다.(S200) 이때, 인덕턴스 보상부(120a)는 지중 송전 케이블의 인덕턴스 및 커패시턴스를 포함하는 지중 송전 케이블의 특성임피던스와 접속함(200)의 인덕턴스 및 커패시턴스를 포함하는 접속함(200)의 특성임피던스에서 나타나는 인덕턴스 차이값을 접속함(200)의 인덕턴스를 보상하는 인덕턴스 보상값으로 산출한다. 또한, 커패시턴스 보상부(120b)는 지중 송전 케이블의 인덕턴스 및 커패시턴스를 포함하는 지중 송전 케이블의 특성임피던스와 접속함(200)의 인덕턴스 및 커패시턴스를 포함하는 접속함(200)의 특성임피던스에서 나타나는 커패시턴스 차이값을 접속함(200)의 커패시턴스를 보상하는 커패시턴스 보상값으로 산출한다.Next, a compensation value for compensating for inductance or capacitance of the junction box 200 is calculated. (S200) At this time, the inductance compensator 120a connects the characteristic impedance of the underground transmission cable including the inductance and the capacitance of the underground transmission cable. The inductance difference value represented by the characteristic impedance of the junction box 200 including the inductance and the capacitance of the box 200 is calculated as an inductance compensation value that compensates for the inductance of the junction box 200. In addition, the capacitance compensation unit 120b is a capacitance difference in the characteristic impedance of the underground transmission cable including the inductance and capacitance of the underground power transmission cable and the characteristic impedance of the junction box 200 including the inductance and capacitance of the junction box 200. The value is calculated as a capacitance compensation value that compensates for the capacitance of the junction box 200.
다음, 보상값을 적용하여 지중 송전 케이블의 특성임피던스와 접속함(200)의 특성임피던스를 동일하게 유지시킨다.(S300) 이때, 인덕턴스 보상부(120a)는 산출된 인덕턴스 보상값을 적용하고, 커패시턴스 보상부(120b)는 산출된 커패시턴스 보상값을 적용하여, 지중 송전 케이블의 특성임피던스와 접속함(200)의 특성임피던스를 동일하게 유지시킨다.Next, by applying a compensation value to maintain the characteristic impedance of the underground transmission cable and the characteristic impedance of the junction box 200 (S300), the inductance compensation unit 120a applies the calculated inductance compensation value, the capacitance The compensator 120b maintains the characteristic impedance of the underground transmission cable and the characteristic impedance of the junction box 200 by applying the calculated capacitance compensation value.
도 10 및 도 11은 본 발명의 실시예에 따른 지중 송전 케이블 접속함의 인덕턴스 또는 커패시턴스를 보상하는 장치 적용 전,후의 진행파 특성을 분석한 그래프이다. 이때, 지중 송전 케이블 접속함(200)의 인덕턴스 또는 커패시턴스를 보상하는 장치의 검증에 필요한 실증시험이 불가능하여 EMTP 시뮬레이션을 통해 적용 전(도 10 참조)과 적용 후(도 11 참조)를 비교 검증을 수행하였다. 10 and 11 are graphs analyzing the propagation wave characteristics before and after applying an apparatus for compensating for inductance or capacitance of an underground transmission cable junction box according to an exemplary embodiment of the present invention. At this time, the empirical test necessary for the verification of the device for compensating the inductance or capacitance of the underground power transmission cable junction box 200 is not possible. Was performed.
도 10에서는 크로스본드 지점에서 단순 직결한 경우 접속함(200)에서 진행파의 투과및 반사의 영향이 나타나고 있으나, 도 11에서는 보상형 인덕턴스, 커패시턴스를 이용해 직결한 경우 접속함(200)에서 어떠한 투과 및 반사의 영향이 나타나지 않음을 확인할 수 있다. In FIG. 10, the effect of the transmission and reflection of the traveling wave is shown in the junction box 200 in the case of a simple direct connection at the cross-bond point. In FIG. 11, the transmission and reflection in the junction box 200 in the case of the direct connection using the compensation inductance and capacitance are illustrated in FIG. 11. It can be seen that the effect of reflection does not appear.

Claims (14)

  1. 지중 송전 케이블의 접속함의 외부 단자부와 전기적으로 연결되는 연결 도체부; 및A connecting conductor portion electrically connected to an external terminal portion of the junction box of the underground power transmission cable; And
    상기 연결 도체부의 내부에 구비되어, 상기 접속함의 인덕턴스(L) 또는 커패시턴스(C)를 보상하는 보상부;를 포함하며,And a compensation part provided inside the connection conductor part to compensate for inductance L or capacitance C of the junction box.
    상기 보상부는, The compensation unit,
    상기 지중 송전 케이블의 인덕턴스 및 커패시턴스와 상기 접속함의 인덕턴스 및 커패시턴스를 입력받아, 상기 접속함의 인덕턴스 또는 커패시턴스를 보상하는 보상값을 산출하고, 상기 보상값을 적용하여 상기 지중 송전 케이블의 특성임피던스와 상기 접속함의 특성임피던스를 동일하게 유지시키는 것을 특징으로 하는 지중 송전 케이블 접속함의 인덕턴스 또는 커패시턴스를 보상하는 장치.The inductance and capacitance of the underground transmission cable and the inductance and capacitance of the junction box are input, and a compensation value for compensating the inductance or capacitance of the junction box is calculated, and the compensation value is applied to the characteristic impedance of the underground transmission cable and the connection. Compensation for inductance or capacitance of underground transmission cable junction box, characterized in that the characteristic impedance of the box is kept the same.
  2. 제 1항에 있어서,The method of claim 1,
    상기 보상부는,The compensation unit,
    상기 접속함의 인덕턴스를 보상하는 인덕턴스 보상부 또는 상기 접속함의 커패시턴스를 보상하는 커패시턴스 보상부로 이루어지는 것을 특징으로 하는 지중 송전 케이블 접속함의 인덕턴스 또는 커패시턴스를 보상하는 장치.And an inductance compensator for compensating the inductance of the junction box, or a capacitance compensator for compensating the capacitance of the junction box.
  3. 제 2항에 있어서,The method of claim 2,
    상기 인덕턴스 보상부는,The inductance compensation unit,
    상기 지중 송전 케이블의 인덕턴스 및 커패시턴스와 상기 접속함의 인덕턴스 및 커패시턴스를 입력받는 제1 입력부;A first input unit configured to receive inductance and capacitance of the underground power transmission cable and inductance and capacitance of the junction box;
    상기 지중 송전 케이블의 인덕턴스 및 커패시턴스를 포함하는 상기 지중 송전 케이블의 특성임피던스와 상기 접속함의 인덕턴스 및 커패시턴스를 포함하는 상기 접속함의 특성임피던스에서 나타나는 인덕턴스 차이값을 상기 접속함의 인덕턴스를 보상하는 인덕턴스 보상값으로 산출하는 인덕턴스 보상값 산출부; 및The difference in inductance appearing in the characteristic impedance of the underground transmission cable including the inductance and the capacitance of the underground transmission cable and the characteristic impedance of the junction box including the inductance and the capacitance of the junction box as an inductance compensation value for compensating the inductance of the junction box. An inductance compensation value calculating unit for calculating; And
    상기 인덕턴스 보상값을 적용하여 상기 지중 송전 케이블의 특성임피던스와 상기 접속함의 특성임피던스를 동일하게 유지시키는 인덕턴스 보상값 적용부Inductance compensation value applying unit for maintaining the characteristic impedance of the underground transmission cable and the characteristic impedance of the junction box by applying the inductance compensation value
    를 포함하는 것을 특징으로 하는 지중 송전 케이블 접속함의 인덕턴스 또는 커패시턴스를 보상하는 장치.Apparatus for compensating the inductance or capacitance of the underground power cable connection box comprising a.
  4. 제 2항에 있어서,The method of claim 2,
    상기 커패시턴스 보상부는,The capacitance compensation unit,
    상기 지중 송전 케이블의 인덕턴스 및 커패시턴스와 상기 접속함의 인덕턴스 및 커패시턴스를 입력받는 제2 입력부;A second input unit configured to receive inductance and capacitance of the underground power transmission cable and inductance and capacitance of the junction box;
    상기 지중 송전 케이블의 인덕턴스 및 커패시턴스를 포함하는 상기 지중 송전 케이블의 특성임피던스와 상기 접속함의 인덕턴스 및 커패시턴스를 포함하는 상기 접속함의 특성임피던스에서 나타나는 커패시턴스 차이값을 상기 접속함의 커패시턴스를 보상하는 커패시턴스 보상값으로 산출하는 커패시턴스 보상값 산출부; 및The capacitance difference value represented by the characteristic impedance of the underground transmission cable including the inductance and capacitance of the underground transmission cable and the characteristic impedance of the junction box including the inductance and capacitance of the junction box as a capacitance compensation value for compensating the capacitance of the junction box. A capacitance compensation value calculating unit for calculating; And
    상기 커패시턴스 보상값을 적용하여 상기 지중 송전 케이블의 특성임피던스와 상기 접속함의 특성임피던스를 동일하게 유지시키는 커패시턴스 보상값 적용부Capacitance compensation value applying unit for maintaining the characteristic impedance of the underground transmission cable and the characteristic impedance of the junction box by applying the capacitance compensation value
    를 포함하는 것을 특징으로 하는 지중 송전 케이블 접속함의 인덕턴스 또는 커패시턴스를 보상하는 장치.Apparatus for compensating the inductance or capacitance of the underground power cable connection box comprising a.
  5. 제 1항에 있어서,The method of claim 1,
    상기 연결 도체부와 상기 외부 단자부의 전기적 연결은 상기 외부 단자부에 상기 연결 도체부의 양측에 구비되는 도체 고정부가 체결 고정되어 이루어지는 것을 특징으로 하는 지중 송전 케이블 접속함의 인덕턴스 또는 커패시턴스를 보상하는 장치.Electrical connection of the connection conductor portion and the external terminal portion is a device for compensating the inductance or capacitance of the underground transmission cable junction box, characterized in that the fastening and fixing of the conductor fixing parts provided on both sides of the connection conductor portion.
  6. 제 5항에 있어서,The method of claim 5,
    상기 도체 고정부는 집게형태로 형성되는 것을 특징으로 하는 지중 송전 케이블 접속함의 인덕턴스 또는 커패시턴스를 보상하는 장치.The conductor fixing device is configured to compensate for the inductance or capacitance of the underground power cable connection box, characterized in that formed in the shape of tongs.
  7. 제 1항에 있어서,The method of claim 1,
    상기 연결 도체부를 수용하는 하우징부를 더 포함하는 것을 특징으로 하는 지중 송전 케이블 접속함의 인덕턴스 또는 커패시턴스를 보상하는 장치.And a housing portion for receiving the connecting conductor portion. The device for compensating for inductance or capacitance of an underground power transmission cable junction box.
  8. 제 7항에 있어서,The method of claim 7, wherein
    상기 하우징부는 절연 물질로 형성되는 것을 특징으로 하는 지중 송전 케이블 접속함의 인덕턴스 또는 커패시턴스를 보상하는 장치.And the housing portion is formed of an insulating material. The apparatus for compensating for inductance or capacitance of an underground power transmission cable junction box.
  9. 지중 송전 케이블의 접속함의 외부 단자부와 전기적으로 연결되는 연결 도체 내부에 구비되어 상기 접속함의 인덕턴스(L) 또는 커패시턴스(C)를 보상하는 보상부를 포함하는 지중 송전 케이블 접속함의 인덕턴스 또는 커패시턴스를 보상하는 장치의 보상 방법에 있어서,Apparatus for compensating for inductance or capacitance of underground transmission cable junction box, which is provided inside a connection conductor electrically connected to an external terminal of the junction box of underground transmission cable and compensates for inductance (L) or capacitance (C) of the junction box In the compensation method of,
    상기 보상부에 의해, 상기 지중 송전 케이블의 인덕턴스 및 커패시턴스와 상기 접속함의 인덕턴스 및 커패시턴스를 입력받는 단계;Receiving, by the compensating unit, inductance and capacitance of the underground power transmission cable and inductance and capacitance of the junction box;
    상기 보상부에 의해, 상기 접속함의 인덕턴스 또는 커패시턴스를 보상하는 보상값을 산출하는 단계; 및Calculating, by the compensation unit, a compensation value for compensating for inductance or capacitance of the junction box; And
    상기 보상부에 의해, 상기 보상값을 적용하여 상기 지중 송전 케이블의 특성임피던스와 상기 접속함의 특성임피던스를 동일하게 유지시키는 단계Maintaining the characteristic impedance of the underground transmission cable and the characteristic impedance of the junction box by applying the compensation value by the compensation unit;
    를 포함하는 것을 특징으로 하는 지중 송전 케이블 접속함의 인덕턴스 또는 커패시턴스를 보상하는 방법.Method for compensating the inductance or capacitance of the underground power transmission cable junction box comprising a.
  10. 제 9항에 있어서,The method of claim 9,
    상기 보상부는 상기 접속함의 인덕턴스를 보상하는 인덕턴스 보상부 또는 상기 접속함의 커패시턴스를 보상하는 커패시턴스 보상부로 이루어지는 것을 특징으로 하는 지중 송전 케이블 접속함의 인덕턴스 또는 커패시턴스를 보상하는 방법.And the compensator comprises an inductance compensator for compensating the inductance of the junction box or a capacitance compensator for compensating the capacitance of the junction box.
  11. 제 10항에 있어서,The method of claim 10,
    상기 보상값을 산출하는 단계에서,In calculating the compensation value,
    상기 인덕턴스 보상부는 상기 지중 송전 케이블의 인덕턴스 및 커패시턴스를 포함하는 상기 지중 송전 케이블의 특성임피던스와 상기 접속함의 인덕턴스 및 커패시턴스를 포함하는 상기 접속함의 특성임피던스에서 나타나는 인덕턴스 차이값을 상기 접속함의 인덕턴스를 보상하는 인덕턴스 보상값으로 산출하는 것을 특징으로 하는 지중 송전 케이블 접속함의 인덕턴스 또는 커패시턴스를 보상하는 방법.The inductance compensator compensates for the inductance of the junction box by a difference between the characteristic impedance of the underground transmission cable including the inductance and capacitance of the underground transmission cable and the characteristic impedance of the junction box including the inductance and capacitance of the junction box. A method for compensating for inductance or capacitance of an underground power transmission cable junction box, characterized in that it is calculated as an inductance compensation value.
  12. 제 11항에 있어서,The method of claim 11,
    상기 케이블의 특성임피던스와 상기 접속함의 특성임피던스를 동일하게 유지시키는 단계에서,In the step of maintaining the characteristic impedance of the cable and the characteristic impedance of the junction box,
    상기 인덕턴스 보상부는 상기 인덕턴스 보상값을 적용하는 것을 특징으로 하는 지중 송전 케이블 접속함의 인덕턴스 또는 커패시턴스를 보상하는 방법.The inductance compensator is applied to the inductance compensation value, characterized in that for compensating the inductance or capacitance of the underground power cable connection box.
  13. 제 10항에 있어서,The method of claim 10,
    상기 보상값을 산출하는 단계에서,In calculating the compensation value,
    상기 커패시턴스 보상부는 상기 지중 송전 케이블의 인덕턴스 및 커패시턴스를 포함하는 상기 지중 송전 케이블의 특성임피던스와 상기 접속함의 인덕턴스 및 커패시턴스를 포함하는 상기 접속함의 특성임피던스에서 나타나는 커패시턴스 차이값을 상기 접속함의 커패시턴스를 보상하는 커패시턴스 보상값으로 산출하는 것을 특징으로 하는 지중 송전 케이블 접속함의 인덕턴스 또는 커패시턴스를 보상하는 방법.The capacitance compensator compensates the capacitance difference of the junction box by the capacitance difference value that appears in the characteristic impedance of the underground transmission cable including the inductance and the capacitance of the underground transmission cable and the characteristic impedance of the junction box including the inductance and capacitance of the junction box. A method for compensating for inductance or capacitance of an underground power transmission cable junction box, characterized in that it is calculated as a capacitance compensation value.
  14. 제 13항에 있어서,The method of claim 13,
    상기 케이블의 특성임피던스와 상기 접속함의 특성임피던스를 동일하게 유지시키는 단계에서,In the step of maintaining the characteristic impedance of the cable and the characteristic impedance of the junction box,
    상기 커패시턴스 보상부는 상기 커패시턴스 보상값을 적용하는 것을 특징으로 하는 지중 송전 케이블 접속함의 인덕턴스 또는 커패시턴스를 보상하는 방법.And the capacitance compensator applies the capacitance compensation value to the inductance or capacitance of the underground power cable connection box.
PCT/KR2013/008419 2012-09-18 2013-09-17 Device for compensating for inductance or capacitance of underground power transmission cable joint box and method therefor WO2014046468A1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106646102A (en) * 2016-09-26 2017-05-10 成都鼎智汇科技有限公司 Cable fault point positioning method

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07167910A (en) * 1993-12-14 1995-07-04 Nippon Keisokki Seizosho:Kk Cable partial discharge measuring method using tuning type partial discharge measuring apparatus
JP2006064461A (en) * 2004-08-25 2006-03-09 Toshiba Corp Partial discharge detection device for electric rotary machine and method for it
KR20060092648A (en) * 2005-02-18 2006-08-23 엘에스전선 주식회사 Partial discharge detection system for underground power cable joint
KR20060097301A (en) * 2005-03-05 2006-09-14 엘에스전선 주식회사 Apparatus of detecting partial discharge in the connecting box for the underground transmission cable
KR20100022785A (en) * 2008-08-20 2010-03-03 한전케이디엔주식회사 System and method for measuaring partial discharge for power cable

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010122139A (en) * 2008-11-21 2010-06-03 Onc:Kk High-frequency probe card

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07167910A (en) * 1993-12-14 1995-07-04 Nippon Keisokki Seizosho:Kk Cable partial discharge measuring method using tuning type partial discharge measuring apparatus
JP2006064461A (en) * 2004-08-25 2006-03-09 Toshiba Corp Partial discharge detection device for electric rotary machine and method for it
KR20060092648A (en) * 2005-02-18 2006-08-23 엘에스전선 주식회사 Partial discharge detection system for underground power cable joint
KR20060097301A (en) * 2005-03-05 2006-09-14 엘에스전선 주식회사 Apparatus of detecting partial discharge in the connecting box for the underground transmission cable
KR20100022785A (en) * 2008-08-20 2010-03-03 한전케이디엔주식회사 System and method for measuaring partial discharge for power cable

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106646102A (en) * 2016-09-26 2017-05-10 成都鼎智汇科技有限公司 Cable fault point positioning method
CN106646102B (en) * 2016-09-26 2019-09-20 山东广域科技有限责任公司 Cable fault independent positioning method

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