WO2013043005A2 - Système de distribution par câble électrique économique - Google Patents

Système de distribution par câble électrique économique Download PDF

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Publication number
WO2013043005A2
WO2013043005A2 PCT/KR2012/007633 KR2012007633W WO2013043005A2 WO 2013043005 A2 WO2013043005 A2 WO 2013043005A2 KR 2012007633 W KR2012007633 W KR 2012007633W WO 2013043005 A2 WO2013043005 A2 WO 2013043005A2
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Prior art keywords
concentric neutral
distribution system
power cable
grounded
concentric
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PCT/KR2012/007633
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Korean (ko)
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WO2013043005A3 (fr
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전명수
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents

Definitions

  • the present invention relates to a three-phase power distribution system of a power cable having a concentric midline, and more particularly, to an economic power cable distribution system that enables economic distribution.
  • the 22.9kV-Y power distribution system directly supplies power to a relatively large customer, such as a factory or a building, through a distribution line from a substation, or a small factory or a general household through a secondary transformer.
  • a relatively large customer such as a factory or a building
  • a distribution line from a substation, or a small factory or a general household
  • a secondary transformer In the conventional cable distribution system, each phase wire and neutral wire forming three phases are distributed separately, but recently, a method of distributing concentric neutral wires concentrically with each phase wire and distributing power without separate neutral wires is used.
  • FIG. 1 shows the general structure of a cable with concentric neutrals.
  • the inner semiconducting layer 2 is coated on the outside of the core wire 1 forming the core, and the insulating layer 3 is formed around the inner semiconducting layer 2.
  • An outer semiconducting layer 4 is formed around the insulating layer 3, and a concentric neutral line 5 is formed outside thereof.
  • the outer shell 6 is covered outside of the concentric neutral line 5.
  • the concentric neutral line 5 is multiplely grounded by using a cable as shown in FIG. 1.
  • the conventional method of multiple grounding the concentric neutral line (5) is as follows. The front end of the concentric neutral line 5 is collectively grounded for each section of the concentric center line 5 partitioned by the manhole 7 and the like, and the rear end is collectively grounded together with the front end of the concentric neutral line 5 of the next section. That is, the concentric neutral line 5 of each phase is grounded at both ends of each section.
  • the multi-grounding method directly grounds the concentric neutral wire to the ground, there is little voltage rise in the event of a ground fault, so that the insulation of the power equipment and the detection of the ground fault current are easy, and the protective relay operates quickly.
  • the present invention has been proposed to solve the problem of the increase in the cross-sectional area due to the cyclic current load of the concentric neutral wire as described above, the one of the three phase of the concentric neutral wire is grounded at both ends, the other two concentric neutral wire is one-sided,
  • the cross-sectional area of the concentric neutral wire that is grounded at one end is smaller than the cross-sectional area of the concentric neutral wire which is grounded at both ends, and the purpose of the present invention is to provide an economical power cable distribution system by minimizing the amount of cables while ensuring safety of the distribution system.
  • the present invention is proposed to prevent the unbalanced current and the circulating current generation of the concentric neutral wire, the ground of the concentric neutral wire of any one phase of the three phase concentric neutral wire, and the other two concentric neutral wire is based on the configuration of one-sided grounding, Distribute the phase wires that ground both ends of the concentric neutral wires in each section of the triangular lines equally to prevent unbalanced currents and circulating currents, as well as to maintain the line constants and to ensure the safety of the distribution system, while minimizing the amount of cables.
  • Another purpose is to provide an economical power cable distribution system.
  • the present invention distributes concentric neutral wires that are grounded at both ends with equal section lengths for each of the three phases of A, B, and C to maintain the line constants of each phase and evenly distribute the earth circulation currents for each phase to offset each other.
  • a power cable distribution system having a concentric neutral line for each phase line of three phases and multiple grounding of the concentric neutral wire, the first cable provided in any one phase line of each phase line
  • the concentric neutral line is disconnected and grounded at both ends of each section
  • the second concentric neutral line provided in the other two merchant ships is disconnected and grounded at one end so that one end is grounded and the other end is opened, and the second concentric neutral line is It has a smaller cross-sectional area than the first concentric neutral line.
  • the power cable distribution system in the power cable distribution system for distributing power cables of A, B, C three phases, each having a concentric neutral wire for each merchant line, A, B, C 3
  • the three sets of branch lines branched from the supply line for supplying the power lines of the phases are respectively grounded at both ends of the first concentric neutral lines provided in phases A, B, and C, and are separated from each other.
  • the second concentric neutral wire is disconnected and includes one end grounded so that one end is grounded and the other end is opened.
  • the power cable distribution system for distributing the power cables of A, B, C three phases, each of which has a concentric neutral wire, the concentric neutral wire is disconnected It is divided into a first concentric neutral wire which is grounded at both ends and a second concentric neutral wire which is grounded at one end and the other end is grounded so that the other end is opened, and the first concentric neutral wire is distributed in each phase of A, B, and C three phases.
  • the second concentric neutral line may be disposed in a section in which the first concentric neutral line is not disposed.
  • the second concentric neutral line may include having a cross-sectional area determined in consideration of the cable ground fault current.
  • the second concentric neutral line may include a cross-sectional area of less than half of the first concentric neutral line.
  • the power cable distribution system may include that the core wire of the merchant ship having the second concentric neutral wire has a smaller cross-sectional area compared to the core wire of the merchant ship having the first concentric neutral wire.
  • the second concentric neutral line may include a smaller cross-sectional area than the first concentric neutral line.
  • the phase line A, B, C three phase may include that the length of the section in which the first concentric neutral wire is disposed evenly distributed.
  • both ends of the three-phase concentric neutrals are grounded on both ends only for one phase of the synchronous neutral line, and the other two phases of the concentric neutrals, one-sided grounded, and the one-sided grounded concentric neutrals may consider the circulating current.
  • both ends grounded only for one concentric neutral line, and one side grounded for the other two phases concentric neutral line,
  • the unbalanced current and the circulating current in the concentric neutral wires can be prevented to balance the line constants, thereby improving convenience of distribution line operation.
  • each phase is configured to be provided with a concentric neutral wire for grounding both ends and a concentric neutral wire for one-sided grounding, by equalizing the interval length of the concentric neutral wire for grounding both ends, each phase Maintain the constant line constant, evenly distribute the earth circulating currents in each phase to bring the concentric neutral composite induced voltage close to zero and cancel the circulating current so that the circulating current hardly occurs and the voltage drop in each phase This can prevent the unbalance of the power supply, thereby stably operating the distribution system and supplying high-quality power.
  • FIG. 1 is a cross-sectional view illustrating a cross section of a cable having a concentric neutral wire.
  • FIG. 2 is a system diagram illustrating a conventional power cable distribution system.
  • FIG. 3 is a schematic diagram illustrating a power cable distribution system according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram illustrating a power cable distribution system according to another embodiment of the present invention.
  • FIG. 5 is a schematic diagram illustrating a power cable distribution system according to another embodiment of the present invention.
  • FIG. 3 is a schematic diagram illustrating a power cable distribution system according to an embodiment of the present invention.
  • FIG. 3 it shows an example of the 22.9kV-Y distribution method for the power cable distribution system according to an embodiment of the present invention.
  • the transformer secondary side of the power distribution system is a Y connection, from which three phase wires A, B, and C are drawn and the neutral wire is reactor grounded.
  • A, B, C three merchant wires are composed of a power cable in the form of a concentric neutral wire (20, 24) formed on the outside of the core wire 10, the configuration of this power cable is referred to as a background art with reference to FIG. Is the same as
  • the concentric neutral line 20 on C is depicted as a thicker line compared to the concentric neutral line 24 on A and B.
  • the concentric neutral line 20 on C depicted as a thick line is referred to as a 'first concentric neutral line'
  • the concentric neutral line 24 on A and B is referred to as a 'second concentric neutral line'. .
  • FIG. 3 illustrates that the first concentric neutral line 20 is provided on C and the second concentric neutral line 24 is provided on the other two, this is only one example of the present invention, and A phase Alternatively, the first concentric neutral line 20 may be provided on B and the second concentric neutral line 24 may be provided on the other two surfaces.
  • the power cable is a manhole 30 is installed in the distribution system.
  • the manhole 30 is a location for connecting a power cable embedded in the ground.
  • the section of the power cable is divided by the manhole 30 and other connection points. Each section of such a power cable is approximately 300m.
  • the front ends of the first concentric neutral wire 20 and the second concentric neutral wire 24 are collectively grounded. As shown in the drawing, the front end of the concentric neutral wire of the first section is grounded together with the neutral wire of the secondary side of the transformer.
  • the first concentric neutral line 20 is connected to the rear end of the first section and the front end of the second section through the connection section 22. Similarly, in the next manhole 30, both the front end and the rear end of the first concentric neutral wire 20 are collectively grounded. That is, as shown, the first concentric neutral line 20 is grounded at both ends of each section.
  • the second concentric neutral line 24 is not interconnected with the rear end of the first section and the front end of the second section. As shown, the first concentric neutral line 24 is open at the rear end of each section to form an opening 26. That is, the second concentric neutral wire 24 is one-sided grounded for each section.
  • the power cable distribution system according to the present invention has a feature in that the cross-sectional area of the second concentric neutral wire 24 is smaller than that of the first concentric neutral wire 20 in the above-described system structure. This significantly reduces the volume of cables, enabling an economical power cable distribution system.
  • the cross-sectional area of the concentric neutral wire in consideration of unbalanced current, circulating current, and cable ground fixed current is considered.
  • the core wire of each merchant ship has a cross-sectional area of 325 mm 2
  • the concentric neutral wire has a cross-sectional area of 108 mm 2, approximately 1/3 of this cross-sectional area.
  • the influence of the unbalanced current and the circulating current is insignificant, and particularly, the unbalanced current and the circulating current do not occur in the second concentric neutral line 24. Therefore, the second concentric neutral line 24 may determine the cross-sectional area in consideration of only the cable ground fault current.
  • Equation 1 The formula for calculating the cross-sectional area of the neutral wire according to the International Electro-technical Commission (IEC) 60949 is shown in Equation 1 below.
  • I is the fault current
  • t is the fault duration
  • K is the conductor-related constant
  • S is the conductor cross-section
  • ⁇ i is the initial operating temperature
  • ⁇ f is the final operating temperature
  • ⁇ is the resistance at 0 ° C. Is the inverse of the temperature coefficient.
  • the maximum ground current current 8515A occurs in the 22.9kV system, it is blocked by the instantaneous element, and the temporary element is operated by back protection of the instantaneous element.
  • Instantaneous element operation time is approximately 0.083 seconds, and time element operation time is 0.5 seconds.
  • the fault can not be sustained for more than 0.5 seconds, the worst case current condition, so I can substitute 8515 and t can assign 0.5.
  • K is 226 and ⁇ is 234.5.
  • ⁇ i and ⁇ f are 90 ° C and 230 ° C for CNCV cables, respectively.
  • the cross-sectional area S obtained therefrom is 44.5 mm 2.
  • the cross-sectional area of the second concentric neutral wire 24 on both A and B phases is greater than 50 mm2 (safety factor, etc.) corresponding to less than half of the cross-sectional area of the first concentric neutral wire 20 (108 mm2). It can be concluded that the general specification of the cable is preferably 50 mm 2). Therefore, it is possible to save a considerable amount of equivalent amount as compared with the conventional power cable distribution system.
  • the cross-sectional area of the core wire 10 on the two A and B two cross-sectional areas is the C core wire cross-sectional area. It can be designed smaller than.
  • the allowable current of the core conductor is determined by the maximum allowable temperature of the cable.
  • the temperature rise of the cable is determined by the heat generated by the current flowing through the core wire and the sheath wire (such as the concentric neutral wire mentioned in the present invention) and the heat dissipation according to the cable structure and material.
  • the constant current allowance of the core wire 10 can be obtained from Equation 3 below.
  • I p is the constant current
  • wd is the dielectric loss
  • r is the AC conductor thread resistance
  • ⁇ 1 is the conductor and sheath loss ratio
  • T 1 is the thermal resistance between the conductor and the sheath
  • T 3 is the thermal resistance of the cable jacket.
  • T4 is the sum of the other thermal resistances.
  • the sheath loss ratio ⁇ 1 is determined by the following expression (4).
  • W s is the sheath loss and W c is the conductor loss.
  • ⁇ 1 has a value of less than one.
  • phase C when the cross-sectional area of the core wire is 325 mm 2, the cross-sectional area of the concentric neutral wire is 108 mm 2, and the ratio of the circulating current of the concentric neutral wire is 45%, ⁇ 1 is 0.545.
  • ⁇ 1 may be referred to as zero because the circulating current is approximately zero.
  • Equation 3 is 7.656 ° C-m / w
  • wd is 2.144 * 10 -4 w / m
  • r is 7.4839 * 10 -7 ⁇ / m
  • T1 is 42.2 ° C-m / w
  • T3 is 76.5 ° C-m / w
  • T4 is 7.656 ° C-m / w
  • the allowable current is always calculated as 662 A in the core of C phase (when lambda 1 is 0.545), and the allowable current of both cores of A and B (when lambda 1 is 0). Calculated as 726A. That is, the constant allowable current on both A and B phases is about 16.72% higher than the C phases. From these calculations, it can be seen that the core conductor cross-sectional area of both A and B phases can be set to 270 mm 2.
  • the core cross-sectional area of the two phases A and B can be designed smaller than that of the C phase, and a considerable amount of equivalent energy can be saved as compared with the conventional power cable distribution system.
  • FIG. 4 is a schematic diagram illustrating a power cable distribution system according to another embodiment of the present invention.
  • each component corresponding to the power cable distribution system according to another embodiment of the present invention and the organic relationship between them is a power cable according to an embodiment of the present invention described in FIG. Since the functions of the respective components corresponding to the power distribution system and the organic relationship therebetween are the same, respective descriptions thereof will be omitted below.
  • a supply line 40 is connected to each merchant line of the transformer secondary side, and a plurality of branch lines 51, 52, and 53 branch from the supply line 40 to the customer side. do.
  • the first branch line 51 has the same system structure as that described above with reference to FIG. That is, a second concentric neutral line 20 is formed on C, and the second concentric neutral line 20 is grounded at both ends of each section.
  • the first concentric neutral lines 24 on both A and B phases are grounded one-sided by sections.
  • a second concentric neutral line 20 is formed in B image, and the second concentric neutral line 20 is grounded at both ends of each section.
  • the first concentric neutral lines 24 on both A and C sides are grounded one by one.
  • a second concentric neutral line 20 is formed on A, and the second concentric neutral line 20 is grounded at each end.
  • the first concentric neutral lines 24 of B and C phases are grounded one by one.
  • the three-phase branch lines 51, 52, and 53 evenly distributes the phase wires of which the concentric neutral wires are grounded at both ends of the A, B, and C phases, thereby maintaining the equilibrium of the line constant within each group. If there are four or more lines diverging from the supply line 40, the line constant may be at least partially balanced by applying the distribution system as shown in FIG. .
  • FIG. 5 is a schematic diagram illustrating a power cable distribution system according to another embodiment of the present invention.
  • each component corresponding to the power cable distribution system according to another embodiment of the present invention and the organic relationship therebetween are described in FIG. 3. Since the functions of the respective components corresponding to the cable distribution system and the organic relationship therebetween are the same, each description thereof will be omitted below.
  • the first concentric neutral wire 20 which is depicted as a thick line, is disposed on C at the branch point of the transformer secondary side, and then on B phase. It can be seen that it is dispersed in phase A and phase C again.
  • the second concentric neutral line 24 is disposed in the A phase and the B phase, and the first concentric neutral line 20 is disposed in the C phase.
  • the openings 26 are formed at the rear end of the concentric neutral wires on the A and B phases, and the connection part 22 is formed at the rear ends of the concentric neutral wires of the C phases.
  • the second concentric neutral line 24 is disposed on the A phase and the C phase, and the first concentric neutral line 20 is disposed on the B phase.
  • the concentric neutral line of the B phase is formed at the rear end.
  • the arrangement and connection of the concentric neutral lines in the third section are the same as in the second section.
  • the first concentric neutral line 20 is disposed on A, and the second concentric neutral line 24 is disposed on B and C.
  • the first concentric neutral line 20 is again disposed on B, and the second concentric neutral line 24 is disposed on A and C.
  • the first section is 300m
  • the second section is 100m
  • the third section is 100m
  • the fourth section is 300m
  • the fifth section is 100m
  • the first concentric neutral line 20 is A
  • B It can be seen that the C phases are distributed in intervals of 300 m.
  • FIG. 5 merely illustrates one embodiment of the present invention. Substantially, even if the length of the section in which the first concentric neutral lines 20 are arranged for each of the A, B, and C phases is not completely the same, the earth circulation is performed. As the current cancels, the voltage unbalance in each phase can be prevented.
  • the power cable distribution system according to the present invention has a feature in that the cross-sectional area of the second concentric neutral wire 24 is smaller than that of the first concentric neutral wire 20 in the above-described system structure. This significantly reduces the volume of cables, enabling an economical power cable distribution system.

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  • Supply And Distribution Of Alternating Current (AREA)
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Abstract

La présente invention porte sur un système de distribution par câble électrique, qui comprend une ligne neutre coaxiale pour chaque ligne de phase de trois phases, et qui effectue la mise à la masse multiple de la ligne neutre coaxiale. Une première ligne neutre coaxiale agencée dans n'importe quelle ligne de phase parmi les lignes de phase est liée par deux points dans chaque section divisée et séparée d'un câble électrique. Une deuxième ligne neutre coaxiale agencée dans les deux autres lignes de phase est liée par un seul point dans chaque section divisée et séparée du câble électrique, de telle sorte qu'une extrémité de la deuxième ligne neutre coaxiale est mise à la masse et l'autre extrémité de la deuxième ligne neutre coaxiale est ouverte. L'aire de section droite de la deuxième ligne neutre coaxiale est plus petite que celle de la première ligne neutre coaxiale. Selon le système de distribution par câble électrique de la présente invention, des lignes neutres coaxiales qui sont liées par un seul point sont distribuées avec une petite paire de sections droites sans qu'il ne soit nécessaire de considérer un courant en circulation, ce qui réduit au minimum la quantité de cuivre utilisée pour un câble et procure un système de distribution par câble électrique très économique.
PCT/KR2012/007633 2011-09-23 2012-09-24 Système de distribution par câble électrique économique Ceased WO2013043005A2 (fr)

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Cited By (2)

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CN115097189A (zh) * 2022-06-29 2022-09-23 广东电网有限责任公司 交叉互联电缆护套环流计算方法、装置、电子设备及介质
CN117175586A (zh) * 2023-11-03 2023-12-05 国网山东省电力公司菏泽供电公司 一种中压线路多场景节能降损处理系统

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KR101659548B1 (ko) * 2016-03-24 2016-09-23 (주)온담엔지니어링 구간별로 단절된 제1 및 제2 동심 중성선으로 형성된 ３상 전력 케이블 배전 시스템을 이용한 비일괄공동접지 방법

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JPS5533803Y2 (fr) * 1974-06-27 1980-08-11
JPH02184215A (ja) * 1989-01-09 1990-07-18 Hitachi Cable Ltd 電力ケーブル線路
KR100438094B1 (ko) * 2001-09-03 2004-07-01 전명수 시즈선 순환전류 및 이상전압 억제장치 및 방법
KR200414236Y1 (ko) * 2006-02-03 2006-04-17 전명수 전력계통 동심중성선 활선절단시공장치
KR101000081B1 (ko) * 2009-01-30 2010-12-09 전명수 3상 전력 케이블 번들 배전 시스템

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115097189A (zh) * 2022-06-29 2022-09-23 广东电网有限责任公司 交叉互联电缆护套环流计算方法、装置、电子设备及介质
CN117175586A (zh) * 2023-11-03 2023-12-05 国网山东省电力公司菏泽供电公司 一种中压线路多场景节能降损处理系统

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