JP2015005522A - Low-consumption power cable - Google Patents
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本発明は，インバータに代表される連続パルスによる電力制御装置および駆動装置のスイッチング動作に伴い発生する充電電流を低減する動力用ケーブルに関するものである。 The present invention relates to a power control device using a continuous pulse typified by an inverter and a power cable for reducing a charging current generated with a switching operation of a drive device.
省エネ対策として，例えばモータや蛍光灯，高圧ランプなどの照明器具の駆動，制御にインバータに代表される連続パルスによる駆動，電力制御装置の利用が増えてきている。連続パルスのスイッチングにあわせて動力用ケーブルは充放電され，特に高い繰返し周波数でスイッチング動作するインバータなどでは，充放電が頻繁に行なわれ，充電電流が増加し消費電力の増加になるため，この充放電に伴う充電電流が課題となっている。従来の動力用ケーブルでは，負荷で必要とする低周波数帯の電流を通電する際に導体で発生する消費電力を低減するために，導体サイズを太くし電気抵抗を小さくする方法が一般的に知られている。しかしながら，動力用ケーブルの充放電に伴う高周波数帯の充電電流により発生する消費電力を低減することは考慮されていない。 As energy saving measures, for example, driving of lighting fixtures such as motors, fluorescent lamps, and high-pressure lamps, driving by continuous pulses typified by inverters, and the use of power control devices are increasing. The power cable is charged and discharged along with the continuous pulse switching. In particular, in an inverter that operates at a high repetition frequency, charging and discharging are performed frequently, increasing the charging current and increasing the power consumption. The charging current accompanying discharge is a problem. In conventional power cables, it is generally known how to increase the conductor size and reduce the electrical resistance in order to reduce the power consumption generated by the conductor when the current in the low frequency band required by the load is applied. It has been. However, it is not considered to reduce the power consumption generated by the charging current in the high frequency band accompanying charging / discharging of the power cable.
図1のインバータによるモータ駆動のように連続パルスにより電力を制御するシステムにおいて使用される動力用ケーブルは，図２に示すようにパルスのスイッチングにあわせて充放電が繰返される。パルスがオフからオンへスイッチングする際に充電され，オンからオフへスイッチングする際に放電が行なわれる。この充電時に，動力用ケーブルの種類や長さに応じた充電電流が動力用ケーブルに流れ込む。例えば，従来の動力用ケーブルであるキャブタイヤケーブルでは本来の負荷で必要とする低周波数帯の電流に係わらず表３の消費電力が発生する。さらには，この充電電流は相間および対地間に漏れ電流として流れ，伝導ノイズおよび放射ノイズの一因となる。ここで，動力用ケーブルの充放電に伴う消費電力は，図３に示すように電力計をインバータ入力側に設置し，インバータへ動力用ケーブルを接続したときと未接続としたときの各電力を測定しその差分とする。なお，動力用ケーブルの非インバータ接続端は開放とする。 As shown in FIG. 2, the power cable used in a system that controls electric power by continuous pulses, such as the motor drive by the inverter of FIG. 1, is repeatedly charged and discharged as the pulses are switched. Charging occurs when the pulse switches from off to on, and discharge occurs when switching from on to off. During this charging, a charging current corresponding to the type and length of the power cable flows into the power cable. For example, a cabtyre cable, which is a conventional power cable, generates the power consumption shown in Table 3 regardless of the current in the low frequency band required for the original load. Furthermore, this charging current flows as a leakage current between phases and between grounds, and contributes to conduction noise and radiation noise. Here, the power consumption associated with charging / discharging of the power cable is the power consumption when a power meter is installed on the inverter input side as shown in Fig. 3 and when the power cable is connected to the inverter. Measure and take the difference. The non-inverter connection end of the power cable is open.
例えば，インバータによるモータ駆動システムにおいては，インバータにより動力用ケーブルに入力されたパルスが動力用ケーブルの相間および対地間を充電しながらモータ端へ伝搬しモータ端で反射する。このモータ端で反射したパルスがインバータ端に達するまでの間，充電電流が動力用ケーブルに流れ込む。この充電電流により発生する消費電力Pは，パルス電圧Ecと動力用ケーブルに流れ込む充電電流iおよびパルスの繰返し周波数fにより式１で与えられる。
P=∫Ec・i
dt × f ・・・（式１）
これにより、消費電力Ｐを抑えるためには、充電電流を低減することにより消費電力の低減が可能であることがわかる。動力用ケーブルに流れ込む充電電流の充電量Icは，図４に示すように，充電電流値Imと充電時間tcの積で近似できる。充電電流値は，パルス電圧と動力用ケーブルの相間および対地間の特性インピーダンスにより決まり，充電時間は，充電電流が動力用ケーブルに入力されてから動力用ケーブルを伝搬してモータ端で反射し，その反射した充電電流がインバータ端に達するまでの時間であり，動力用ケーブル長に比例する。この知見を基にして、本発明は，このような動力用ケーブルの充放電に伴う消費電力の低減およびノイズ対策として，従来の動力用ケーブルよりも充電電流の充電量を低減した動力用ケーブルを提供することを目的とする。
For example, in a motor drive system using an inverter, a pulse input to a power cable by the inverter propagates to the motor end while charging between the phases and the ground of the power cable and is reflected at the motor end. The charging current flows into the power cable until the pulse reflected at the motor end reaches the inverter end. The power consumption P generated by this charging current is given by Equation 1 by the pulse voltage Ec, the charging current i flowing into the power cable, and the pulse repetition frequency f.
P = ∫Ec ・ i
dt x f (Formula 1)
Thereby, in order to suppress power consumption P, it turns out that power consumption can be reduced by reducing charging current. The charging amount Ic of the charging current flowing into the power cable can be approximated by the product of the charging current value Im and the charging time tc as shown in FIG. The charging current value is determined by the characteristic impedance between the pulse voltage and the phase of the power cable and between the ground, and the charging time is reflected at the motor end after propagating through the power cable after the charging current is input to the power cable. This is the time it takes for the reflected charging current to reach the inverter end, and is proportional to the power cable length. Based on this knowledge, the present invention provides a power cable having a lower charge amount than that of a conventional power cable as a reduction in power consumption and noise countermeasures associated with charging / discharging of the power cable. The purpose is to provide.
上記課題を解決するために，本発明の動力用ケーブルは，従来の動力用ケーブルより充電電流値と充電時間の積としての充電量を低減し，さらには漏れ電流を低減するものであって，従来の動力用ケーブルに比べ１０Ω以上高い特性インピーダンスとなるように，さらには，単位長当たりの充電時間が１０ｎｓ以下となるように，低実効誘電率の絶縁構造を相間および対地間に備えることを特徴とする。ここで，本発明においては，低実効誘電率とは２以下の実効誘電率を言う。なお，従来の動力用ケーブルであるキャブタイヤケーブルの絶縁心線やシースは，測定をすると実効誘電率がおおよそ２．３から３．４の範囲にある。 In order to solve the above problems, the power cable of the present invention reduces the amount of charge as the product of the charging current value and the charging time and further reduces the leakage current as compared with the conventional power cable. It is necessary to provide an insulation structure with a low effective dielectric constant between the phase and the ground so that the characteristic impedance is 10Ω or more higher than that of the conventional power cable, and further the charging time per unit length is 10 ns or less. Features. Here, in the present invention, the low effective dielectric constant means an effective dielectric constant of 2 or less. In addition, when measured, the insulation core wire and the sheath of the cabtyre cable, which is a conventional power cable, have an effective dielectric constant in the range of about 2.3 to 3.4.
また，本発明の動力用ケーブルは，従来の動力用ケーブルより充電電流値を低減し，さらには漏れ電流を低減するものであって，従来の動力用ケーブルに比べ１０Ω以上高い特性インピーダンスとなるように，磁性材を各絶縁心線の絶縁被覆またはシースに，又は各絶縁心線の絶縁被覆の外周または絶縁心線を一括するように配置することを特徴とする。なお，代表的な従来の動力用ケーブルの特性インピーダンス例を表４に，その測定方法を図５に示す。 Further, the power cable of the present invention reduces the charging current value and further reduces the leakage current as compared with the conventional power cable, and has a characteristic impedance higher than that of the conventional power cable by 10Ω or more. In addition, the magnetic material is arranged on the insulating coating or sheath of each insulating core wire, or arranged so that the outer periphery or insulating core wire of each insulating core wire is bundled. An example of characteristic impedance of a typical conventional power cable is shown in Table 4, and the measurement method is shown in FIG.
図７の第１の実施の形態に示す本発明の絶縁被覆に発泡ポリエチレンを使用した導体サイズ2mm2で４心の動力用ケーブル５０ｍと従来の動力用ケーブルVCT4-2mm2 ５０ｍとの充電量および消費電力の比較結果を表６に，充電電流波形を図６に示す。 Charge amount and power consumption of a power cable 50 m of 4 cores and a conventional power cable VCT4-2 mm2 50 m using a foamed polyethylene of insulation polyethylene of the present invention shown in the first embodiment of FIG. The comparison results are shown in Table 6, and the charging current waveform is shown in FIG.
第１の実施の形態例を図７に示す。これは請求項１又は請求項３記載の発明に対応する実施例であり、各絶縁心線の絶縁被覆およびシースに発泡度３０％の発泡ポリエチレンを用いる。
導体1aの外周に高発泡絶縁体による低実効誘電率の絶縁被覆1bを施した絶縁心線1を複数本撚り合わせ、その上に低実効誘電率のシース９を施した動力用ケーブル。導体の外周に高発泡絶縁などの低実効誘電率の絶縁被覆を施すことで導体1a，2a，3aおよび4a間を１．９５の低実効誘電率とし，充電量の低減を実現する。
A first embodiment is shown in FIG. This is an embodiment corresponding to the invention described in claim 1 or claim 3, and foamed polyethylene having a foaming degree of 30% is used for the insulation coating and sheath of each insulation core wire.
A power cable in which a plurality of insulation core wires 1 each having a low effective dielectric constant insulation coating 1b made of a highly foamed insulator are twisted around the conductor 1a and a sheath 9 having a low effective dielectric constant is provided thereon. A low effective dielectric constant of 1.95 is achieved between conductors 1a, 2a, 3a, and 4a by applying a low effective dielectric insulating coating such as high foam insulation on the outer periphery of the conductor, realizing a reduction in charge.
第２の実施の形態例を図８に示す。これは請求項４記載の発明に対応する実施例であり、各絶縁心線間および各絶縁心線とアース間に空隙として中空構造を設けたものである。
導体1aの外周に絶縁被覆を施した絶縁心線1を複数本と中空構造などの絶縁体5を撚り合わせ、その上にシース９を施した動力用ケーブル。各心線間に低実効誘電率の絶縁体を施し，更に中空絶縁体により導体間の離隔距離を確保することで導体1a，2a，3aおよび4a間を１．８５の低実効誘電率とし，充電量の低減を実現する。
A second embodiment is shown in FIG. This is an embodiment corresponding to the invention as set forth in claim 4, wherein a hollow structure is provided as a gap between each insulated core wire and between each insulated core wire and the ground.
A power cable in which a plurality of insulating cores 1 each having an insulation coating on the outer periphery of a conductor 1a are twisted together with an insulator 5 such as a hollow structure and a sheath 9 is provided thereon. A low effective dielectric constant of 1.85 is provided between conductors 1a, 2a, 3a and 4a by providing a low effective dielectric insulator between each core wire and further ensuring a separation distance between the conductors by a hollow insulator. Achieves a reduction in charge.
第３の実施の形態例を図９に示す。これは請求項２記載の発明に対応する実施例であり
，各絶縁心線に２以下の低実効誘電率となる絶縁体を用いたものである。
導体1aの外周に絶縁被覆1bを施した絶縁心線にコルデル1cを巻きつけた心線1を複数本撚り合わせ、その上に低実効誘電率のシース９を施した動力用ケーブル。コルデル型絶縁体とすることで各心線間を低実効誘電率とし，導体間の離隔距離を確保することで導体1a，2a，3aおよび4a間を１．２４の低実効誘電率とし，充電量の低減を実現する。
A third embodiment is shown in FIG. This is an embodiment corresponding to the second aspect of the invention, and an insulator having a low effective dielectric constant of 2 or less is used for each insulating core wire.
A power cable in which a plurality of core wires 1 each having a cordel 1c wound around an insulating core wire having an insulating coating 1b on the outer periphery of the conductor 1a are twisted and a sheath 9 having a low effective dielectric constant is provided thereon. By using a Cordel-type insulator, a low effective dielectric constant is provided between the cores, and by securing a separation distance between the conductors, a low effective dielectric constant of 1.24 is provided between the conductors 1a, 2a, 3a, and 4a. Realize a reduction in quantity.
第４の実施の形態例を図１０に示す。これは請求項６又は請求項７記載の発明に対応する実施例であり，絶縁心線を一括する絶縁材を施した，さらにはリターン線を低インダクタンスとするように対称形構造を用いる。
導体1aの外周に絶縁被覆1bを施した絶縁心線1を３本，ケーブル断面方向から見て，それぞれの絶縁心線を，ほぼ正三角形の３つの頂点上に独立させて配置し，さらに，３本のからなるリターン線６をそれぞれ，ほぼ正三角形の３つの頂点に独立させて配置し，かつ，絶縁心線の頂点とリターン線の頂点がほぼ４５度のズレ角度となるように撚り合わせ，その外周にフェライトテープ８を施し、その上にシース９を施した動力用ケーブル。対称形構造とすることで伝導ノイズを低減し，さらに外周のフェライトテープにより放射ノイズを低減する。また，リターン線と絶縁心線を介在７で離隔することで，導体1a，2a，3aとリターン線６間を１．９４の低実効誘電率とし，充電量の低減を実現する。
A fourth embodiment is shown in FIG. This is an embodiment corresponding to the invention described in claim 6 or claim 7, and a symmetrical structure is used in which an insulating material is applied to the insulating core wires and the return line has a low inductance.
Three insulation cores 1 with an insulation coating 1b on the outer circumference of the conductor 1a, as viewed from the cable cross-sectional direction, each insulation core is arranged independently on three vertices of an equilateral triangle, Each of the three return lines 6 is arranged independently at three vertices of an equilateral triangle, and is twisted so that the vertex of the insulation core and the vertex of the return line have a misalignment angle of about 45 degrees. A power cable having a ferrite tape 8 on its outer periphery and a sheath 9 thereon. Conductive noise is reduced by using a symmetric structure, and radiation noise is reduced by the outer peripheral ferrite tape. Further, by separating the return line and the insulation core line by the interposition 7, the conductors 1a, 2a, 3a and the return line 6 are made to have a low effective dielectric constant of 1.94, and the amount of charge is reduced.
第５の実施の形態例を図１１に示す。これは請求項１又は請求項４記載の発明に対応する実施例であり，各絶縁心線間および各絶縁心線とアース間に空隙として中空構造を設けたものである。
導体1a，2a，3aおよび4aに絶縁被覆１０を施し，ケーブル断面方向から見て，それぞれの導体を，ほぼ正方形の４つの頂点上に配置し，その上に低実効誘電率のシース９を施した動力用ケーブル。隣接する導体を同一円周上に，ほぼ９０度回転した位置に配置することで離隔距離を確保し，さらに中空絶縁体５により強度の確保，および導体1a，2a，3aおよび4a間を１．７４の低実効誘電率とし，充電量の低減を実現する。
A fifth embodiment is shown in FIG. This is an embodiment corresponding to the invention described in claim 1 or claim 4, in which a hollow structure is provided as a gap between each insulated core wire and between each insulated core wire and ground.
Insulating coating 10 is applied to conductors 1a, 2a, 3a, and 4a, and when viewed from the cross-sectional direction of the cable, each conductor is arranged on approximately four apexes of a square, and a sheath 9 having a low effective dielectric constant is applied thereon. Power cable. Adjacent conductors are arranged on the same circumference at positions rotated by approximately 90 degrees to ensure a separation distance, and further, strength is ensured by the hollow insulator 5 and 1. 1 between the conductors 1a, 2a, 3a and 4a. A low effective dielectric constant of 74 is realized to reduce the amount of charge.
１a 導体
１b 絶縁体
１c コルデル
２a 導体
３a 導体
４a 導体
１ 絶縁芯線
５ 絶縁体
６ リターン線
７ 介在
８ フェライトテープ
９ シース
１０ 絶縁体
1a conductor 1b insulator 1c cordel 2a conductor 3a conductor 4a conductor 1 insulating core wire 5 insulator 6 return wire 7 interposition 8 ferrite tape 9 sheath 10 insulator
本発明は，インバータに代表される連続パルスによる電力制御装置および駆動装置のスイッチング動作に伴い発生する充電電流を低減する動力用ケーブルに関するものである。 The present invention relates to a power control device using a continuous pulse typified by an inverter and a power cable for reducing a charging current generated with a switching operation of a drive device.
省エネ対策として，例えばモータや蛍光灯，高圧ランプなどの照明器具の駆動，制御にインバータに代表される連続パルスによる駆動，電力制御装置の利用が増えてきている。連続パルスのスイッチングにあわせて動力用ケーブルは充放電され，特に高い繰返し周波数でスイッチング動作するインバータなどでは，充放電が頻繁に行なわれ，充電電流が増加し消費電力の増加になるため，この充放電に伴う充電電流が課題となっている。従来の動力用ケーブルでは，負荷で必要とする低周波数帯の電流を通電する際に導体で発生する消費電力を低減するために，導体サイズを太くし電気抵抗を小さくする方法が一般的に知られている。しかしながら，動力用ケーブルの充放電に伴う高周波数帯の充電電流により発生する消費電力を低減することは考慮されていない。 As energy saving measures, for example, driving of lighting fixtures such as motors, fluorescent lamps, and high-pressure lamps, driving by continuous pulses typified by inverters, and the use of power control devices are increasing. The power cable is charged and discharged along with the continuous pulse switching. In particular, in an inverter that operates at a high repetition frequency, charging and discharging are performed frequently, increasing the charging current and increasing the power consumption. The charging current accompanying discharge is a problem. In conventional power cables, it is generally known how to increase the conductor size and reduce the electrical resistance in order to reduce the power consumption generated by the conductor when the current in the low frequency band required by the load is applied. It has been. However, it is not considered to reduce the power consumption generated by the charging current in the high frequency band accompanying charging / discharging of the power cable.
図1のインバータによるモータ駆動のように連続パルスにより電力を制御するシステムにおいて使用される動力用ケーブルは，図２に示すようにパルスのスイッチングにあわせて充放電が繰返される。パルスがオフからオンへスイッチングする際に充電され，オンからオフへスイッチングする際に放電が行なわれる。この充電時に，動力用ケーブルの種類や長さに応じた充電電流が動力用ケーブルに流れ込む。例えば，従来の動力用ケーブルであるキャブタイヤケーブルでは本来の負荷で必要とする低周波数帯の電流に係わらず表３の消費電力が発生する。さらには，この充電電流は相間および対地間に漏れ電流として流れ，伝導ノイズおよび放射ノイズの一因となる。ここで，動力用ケーブルの充放電に伴う消費電力は，図３に示すように電力計をインバータ入力側に設置し，インバータへ動力用ケーブルを接続したときと未接続としたときの各電力を測定しその差分とする。なお，動力用ケーブルの非インバータ接続端は開放とする。 As shown in FIG. 2, the power cable used in a system that controls electric power by continuous pulses, such as the motor drive by the inverter of FIG. 1, is repeatedly charged and discharged as the pulses are switched. Charging occurs when the pulse switches from off to on, and discharge occurs when switching from on to off. During this charging, a charging current corresponding to the type and length of the power cable flows into the power cable. For example, a cabtyre cable, which is a conventional power cable, generates the power consumption shown in Table 3 regardless of the current in the low frequency band required for the original load. Furthermore, this charging current flows as a leakage current between phases and between grounds, and contributes to conduction noise and radiation noise. Here, the power consumption associated with charging / discharging of the power cable is the power consumption when a power meter is installed on the inverter input side as shown in Fig. 3 and when the power cable is connected to the inverter. Measure and take the difference. The non-inverter connection end of the power cable is open.
例えば，インバータによるモータ駆動システムにおいては，インバータにより動力用ケーブルに入力されたパルスが動力用ケーブルの相間および対地間を充電しながらモータ端へ伝搬しモータ端で反射する。このモータ端で反射したパルスがインバータ端に達するまでの間，充電電流が動力用ケーブルに流れ込む。この充電電流により発生する消費電力Pは，パルス電圧Ecと動力用ケーブルに流れ込む充電電流iおよびパルスの繰返し周波数fにより式１で与えられる。
P=∫Ec・i
dt × f ・・・（式１）
これにより、消費電力Ｐを抑えるためには、充電電流を低減することにより消費電力の低減が可能であることがわかる。動力用ケーブルに流れ込む充電電流の充電量Icは，図４に示すように，充電電流値Imと充電時間tcの積で近似できる。充電電流値は，パルス電圧と動力用ケーブルの相間および対地間の特性インピーダンスにより決まり，充電時間は，充電電流が動力用ケーブルに入力されてから動力用ケーブルを伝搬してモータ端で反射し，その反射した充電電流がインバータ端に達するまでの時間であり，動力用ケーブル長に比例する。この知見を基にして、本発明は，このような動力用ケーブルの充放電に伴う消費電力の低減およびノイズ対策として，従来の動力用ケーブルよりも充電電流の充電量を低減した動力用ケーブルを提供することを目的とする。
For example, in a motor drive system using an inverter, a pulse input to a power cable by the inverter propagates to the motor end while charging between the phases and the ground of the power cable and is reflected at the motor end. The charging current flows into the power cable until the pulse reflected at the motor end reaches the inverter end. The power consumption P generated by this charging current is given by Equation 1 by the pulse voltage Ec, the charging current i flowing into the power cable, and the pulse repetition frequency f.
P = ∫Ec ・ i
dt x f (Formula 1)
Thereby, in order to suppress power consumption P, it turns out that power consumption can be reduced by reducing charging current. The charging amount Ic of the charging current flowing into the power cable can be approximated by the product of the charging current value Im and the charging time tc as shown in FIG. The charging current value is determined by the characteristic impedance between the pulse voltage and the phase of the power cable and between the ground, and the charging time is reflected at the motor end after propagating through the power cable after the charging current is input to the power cable. This is the time it takes for the reflected charging current to reach the inverter end, and is proportional to the power cable length. Based on this knowledge, the present invention provides a power cable having a lower charge amount than that of a conventional power cable as a reduction in power consumption and noise countermeasures associated with charging / discharging of the power cable. The purpose is to provide.
上記課題を解決するために，本発明の動力用ケーブルは，従来の動力用ケーブルより充電電流値と充電時間の積としての充電量を低減し，さらには漏れ電流を低減するものであって，従来の動力用ケーブルに比べ１０Ω以上高い特性インピーダンスとなるように，さらには，単位長当たりの充電時間が１０ｎｓ以下となるように，低実効誘電率の絶縁構造を相間および対地間に備えることを特徴とする。ここで，本発明においては，低実効誘電率とは２以下の実効誘電率を言う。なお，従来の動力用ケーブルであるキャブタイヤケーブルの絶縁心線やシースは，測定をすると実効誘電率がおおよそ２．３から３．４の範囲にある。 In order to solve the above problems, the power cable of the present invention reduces the amount of charge as the product of the charging current value and the charging time and further reduces the leakage current as compared with the conventional power cable. It is necessary to provide an insulation structure with a low effective dielectric constant between the phase and the ground so that the characteristic impedance is 10Ω or more higher than that of the conventional power cable, and further the charging time per unit length is 10 ns or less. Features. Here, in the present invention, the low effective dielectric constant means an effective dielectric constant of 2 or less. In addition, when measured, the insulation core wire and the sheath of the cabtyre cable, which is a conventional power cable, have an effective dielectric constant in the range of about 2.3 to 3.4.
また，本発明の動力用ケーブルは，従来の動力用ケーブルより充電電流値を低減し，さらには漏れ電流を低減するものであって，従来の動力用ケーブルに比べ１０Ω以上高い特性インピーダンスとなるように，磁性材を各絶縁心線の絶縁被覆またはシースに，又は各絶縁心線の絶縁被覆の外周または絶縁心線を一括するように配置することを特徴とする。なお，代表的な従来の動力用ケーブルの特性インピーダンス例を表４に，その測定方法を図５に示す。 Further, the power cable of the present invention reduces the charging current value and further reduces the leakage current as compared with the conventional power cable, and has a characteristic impedance higher than that of the conventional power cable by 10Ω or more. In addition, the magnetic material is arranged on the insulating coating or sheath of each insulating core wire, or arranged so that the outer periphery or insulating core wire of each insulating core wire is bundled. An example of characteristic impedance of a typical conventional power cable is shown in Table 4, and the measurement method is shown in FIG.
図７の第１の実施の形態に示す本発明の絶縁被覆に発泡ポリエチレンを使用した導体サイズ2mm2で４心の動力用ケーブル５０ｍと従来の動力用ケーブルVCT4-2mm2 ５０ｍとの充電量および消費電力の比較結果を表６に，充電電流波形を図６に示す。 Charge amount and power consumption of a power cable 50 m of 4 cores and a conventional power cable VCT4-2 mm2 50 m using a foamed polyethylene of insulation polyethylene of the present invention shown in the first embodiment of FIG. The comparison results are shown in Table 6, and the charging current waveform is shown in FIG.
第１の実施の形態例を図７に示す。これは請求項１又は請求項３記載の発明に対応する実施例であり、各絶縁心線の絶縁被覆およびシースに発泡度３０％の発泡ポリエチレンを用いる。
導体1aの外周に高発泡絶縁体による低実効誘電率の絶縁被覆1bを施した絶縁心線1を複数本撚り合わせ、その上に低実効誘電率のシース９を施した動力用ケーブル。導体の外周に高発泡絶縁などの低実効誘電率の絶縁被覆を施すことで導体1a，2a，3aおよび4a間を１．９５の低実効誘電率とし，充電量の低減を実現する。
A first embodiment is shown in FIG. This is an embodiment corresponding to the invention described in claim 1 or claim 3, and foamed polyethylene having a foaming degree of 30% is used for the insulation coating and sheath of each insulation core wire.
A power cable in which a plurality of insulation core wires 1 each having a low effective dielectric constant insulation coating 1b made of a highly foamed insulator are twisted around the conductor 1a and a sheath 9 having a low effective dielectric constant is provided thereon. A low effective dielectric constant of 1.95 is achieved between conductors 1a, 2a, 3a, and 4a by applying a low effective dielectric insulating coating such as high foam insulation on the outer periphery of the conductor, realizing a reduction in charge.
第２の実施の形態例を図８に示す。これは請求項４記載の発明に対応する実施例であり、各絶縁心線間および各絶縁心線とアース間に空隙として中空構造を設けたものである。
導体1aの外周に絶縁被覆を施した絶縁心線1を複数本と中空構造などの絶縁体5を撚り合わせ、その上にシース９を施した動力用ケーブル。各心線間に低実効誘電率の絶縁体を施し，更に中空絶縁体により導体間の離隔距離を確保することで導体1a，2a，3aおよび4a間を１．８５の低実効誘電率とし，充電量の低減を実現する。
A second embodiment is shown in FIG. This is an embodiment corresponding to the invention as set forth in claim 4, wherein a hollow structure is provided as a gap between each insulated core wire and between each insulated core wire and the ground.
A power cable in which a plurality of insulating cores 1 each having an insulation coating on the outer periphery of a conductor 1a are twisted together with an insulator 5 such as a hollow structure and a sheath 9 is provided thereon. A low effective dielectric constant of 1.85 is provided between conductors 1a, 2a, 3a and 4a by providing a low effective dielectric insulator between each core wire and further ensuring a separation distance between the conductors by a hollow insulator. Achieves a reduction in charge.
第３の実施の形態例を図９に示す。これは請求項２記載の発明に対応する実施例であり
，各絶縁心線に２以下の低実効誘電率となる絶縁体を用いたものである。
導体1aの外周に絶縁被覆1bを施した絶縁心線にコルデル1cを巻きつけた心線1を複数本撚り合わせ、その上に低実効誘電率のシース９を施した動力用ケーブル。コルデル型絶縁体とすることで各心線間を低実効誘電率とし，導体間の離隔距離を確保することで導体1a，2a，3aおよび4a間を１．２４の低実効誘電率とし，充電量の低減を実現する。
A third embodiment is shown in FIG. This is an embodiment corresponding to the second aspect of the invention, and an insulator having a low effective dielectric constant of 2 or less is used for each insulating core wire.
A power cable in which a plurality of core wires 1 each having a cordel 1c wound around an insulating core wire having an insulating coating 1b on the outer periphery of the conductor 1a are twisted and a sheath 9 having a low effective dielectric constant is provided thereon. By using a Cordel-type insulator, a low effective dielectric constant is provided between the cores, and by securing a separation distance between the conductors, a low effective dielectric constant of 1.24 is provided between the conductors 1a, 2a, 3a, and 4a. Realize a reduction in quantity.
第４の実施の形態例を図１０に示す。これは請求項６又は請求項７記載の発明に対応する実施例であり，絶縁心線を一括する絶縁材を施した，さらにはリターン線を低インダクタンスとするように対称形構造を用いる。
導体1aの外周に絶縁被覆1bを施した絶縁心線1を３本，ケーブル断面方向から見て，それぞれの絶縁心線を，ほぼ正三角形の３つの頂点上に独立させて配置し，さらに，３本のからなるリターン線６をそれぞれ，ほぼ正三角形の３つの頂点に独立させて配置し，かつ，絶縁心線の頂点とリターン線の頂点がほぼ４５度のズレ角度となるように撚り合わせ，その外周にフェライトテープ８を施し、その上にシース９を施した動力用ケーブル。対称形構造とすることで伝導ノイズを低減し，さらに外周のフェライトテープにより放射ノイズを低減する。また，リターン線と絶縁心線を介在７で離隔することで，導体1a，2a，3aとリターン線６間を１．９４の低実効誘電率とし，充電量の低減を実現する。
A fourth embodiment is shown in FIG. This is an embodiment corresponding to the invention described in claim 6 or claim 7, and a symmetrical structure is used in which an insulating material is applied to the insulating core wires and the return line has a low inductance.
Three insulation cores 1 with an insulation coating 1b on the outer circumference of the conductor 1a, as viewed from the cable cross-sectional direction, each insulation core is arranged independently on three vertices of an equilateral triangle, Each of the three return lines 6 is arranged independently at three vertices of an equilateral triangle, and is twisted so that the vertex of the insulation core and the vertex of the return line have a misalignment angle of about 45 degrees. A power cable having a ferrite tape 8 on its outer periphery and a sheath 9 thereon. Conductive noise is reduced by using a symmetric structure, and radiation noise is reduced by the outer peripheral ferrite tape. Further, by separating the return line and the insulation core line by the interposition 7, the conductors 1a, 2a, 3a and the return line 6 are made to have a low effective dielectric constant of 1.94, and the amount of charge is reduced.
第５の実施の形態例を図１１に示す。これは請求項１又は請求項４記載の発明に対応する実施例であり，各絶縁心線間および各絶縁心線とアース間に空隙として中空構造を設けたものである。
導体1a，2a，3aおよび4aに絶縁被覆１０を施し，ケーブル断面方向から見て，それぞれの導体を，ほぼ正方形の４つの頂点上に配置し，その上に低実効誘電率のシース９を施した動力用ケーブル。隣接する導体を同一円周上に，ほぼ９０度回転した位置に配置することで離隔距離を確保し，さらに中空絶縁体５により強度の確保，および導体1a，2a，3aおよび4a間を１．７４の低実効誘電率とし，充電量の低減を実現する。
A fifth embodiment is shown in FIG. This is an embodiment corresponding to the invention described in claim 1 or claim 4, in which a hollow structure is provided as a gap between each insulated core wire and between each insulated core wire and ground.
Insulating coating 10 is applied to conductors 1a, 2a, 3a, and 4a, and when viewed from the cross-sectional direction of the cable, each conductor is arranged on approximately four apexes of a square, and a sheath 9 having a low effective dielectric constant is applied thereon. Power cable. Adjacent conductors are arranged on the same circumference at positions rotated by approximately 90 degrees to ensure a separation distance, and further, strength is ensured by the hollow insulator 5 and 1. 1 between the conductors 1a, 2a, 3a and 4a. A low effective dielectric constant of 74 is realized to reduce the amount of charge.
本発明の動力ケーブルは、連続パルスに伴い発生する充放電電流を抑制する動力用ケーブルであって，充電電流値と充電時間の積としての充電量を低減するように，相間および対地間の特性インピーダンスを大きくするように，各導体間の絶縁体の実効誘電率を２以下の低実効誘電率となるように構成することができる。The power cable of the present invention is a power cable that suppresses the charge / discharge current generated with continuous pulses, and has characteristics between phases and between the ground so as to reduce the amount of charge as the product of the charge current value and the charge time. In order to increase the impedance, the effective dielectric constant of the insulator between the conductors can be configured to be a low effective dielectric constant of 2 or less.
更に、本発明の動力ケーブルは、前記２以下の低実効誘電率となるような構成として、各絶縁心線の絶縁被覆又はシースに２以下の低実効誘電率の絶縁体を用いることができる。Furthermore, in the power cable of the present invention, an insulator having a low effective dielectric constant of 2 or less can be used for the insulation coating or sheath of each insulating core wire as a configuration having a low effective dielectric constant of 2 or less.
更に、本発明の動力ケーブルは、連続パルスに伴い発生する充放電電流を抑制する動力用ケーブルであって，各絶縁心線の絶縁被覆およびシースに発泡ポリエチレンを用いることができる。Furthermore, the power cable of the present invention is a power cable that suppresses a charge / discharge current generated with continuous pulses, and foamed polyethylene can be used for the insulation coating and sheath of each insulation core.
本発明の動力ケーブルは、連続パルスに伴い発生する充放電電流を抑制する動力用ケーブルであって，充電電流値と充電時間の積としての充電量を低減するように，相間および対地間の特性インピーダンスを大きくするように，各絶縁心線間および各絶縁心線とアース間に空隙を設けることができる。The power cable of the present invention is a power cable that suppresses the charge / discharge current generated with continuous pulses, and has characteristics between phases and between the ground so as to reduce the amount of charge as the product of the charge current value and the charge time. Air gaps can be provided between the insulated core wires and between the insulated core wires and the ground so as to increase the impedance.
本発明の動力ケーブルは、連続パルスに伴い発生する充放電電流を抑制する動力用ケーブルであって，充電電流値を低減するように，相間および対地間の特性インピーダンスを大きくするように各絶縁心線の絶縁被覆またはシースに磁性材を使用することができる。The power cable of the present invention is a power cable that suppresses the charging / discharging current generated with the continuous pulse, and is designed to increase the characteristic impedance between the phases and the ground so as to reduce the charging current value. Magnetic materials can be used for the wire insulation or sheath.
本発明の動力ケーブルは、連続パルスに伴い発生する充放電電流を抑制する動力用ケーブルであって，充電電流値を低減するように，相間および対地間の特性インピーダンスを大きくするように各絶縁心線の絶縁被覆の外周または絶縁心線を一括する絶縁材を配置することができる。The power cable of the present invention is a power cable that suppresses the charging / discharging current generated with the continuous pulse, and is designed to increase the characteristic impedance between the phases and the ground so as to reduce the charging current value. An insulating material that collects the outer periphery of the insulating coating of the wire or the insulating core wire can be disposed.
本発明の動力ケーブルは、連続パルスに伴い発生する充放電電流を抑制する動力用ケーブルであって，充電電流による放射ノイズまたは伝導ノイズを低減するように，リターン線が低インダクタンスとなるように対称形構造とすることができる。The power cable of the present invention is a power cable that suppresses the charging / discharging current generated with continuous pulses, and is symmetrical so that the return line has a low inductance so as to reduce radiation noise or conduction noise caused by the charging current. It can be a shape structure.
１ａ 導体
１ｂ 絶縁体
１ｃ コルデル
２ａ 導体
３ａ 導体
４ａ 導体
１ 絶縁芯線
５ 絶縁体
６ リターン線
７ 介在
８ フェライトテープ
９ シース
１０ 絶縁体
DESCRIPTION OF SYMBOLS 1a Conductor 1b Insulator 1c Cordel 2a Conductor 3a Conductor 4a Conductor 1 Insulating core wire 5 Insulator 6 Return wire 7 Interposition 8 Ferrite tape 9 Sheath 10 Insulator
Claims (7)
A power cable that suppresses the charging / discharging current generated by continuous pulses, and is characterized by a symmetrical structure so that the return line has a low inductance so as to reduce radiation noise or conduction noise caused by the charging current. A power cable according to one of claims 1 to 4.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105355292A (en) * | 2015-12-10 | 2016-02-24 | 无锡市华美电缆有限公司 | High-performance electric automobile charging pile cable |
| JP2017024094A (en) * | 2015-07-17 | 2017-02-02 | セイコーエプソン株式会社 | Robot system and cable |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017024094A (en) * | 2015-07-17 | 2017-02-02 | セイコーエプソン株式会社 | Robot system and cable |
| CN105355292A (en) * | 2015-12-10 | 2016-02-24 | 无锡市华美电缆有限公司 | High-performance electric automobile charging pile cable |
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