JP2015226357A - Ground fault current detector and installation method for ground fault current detector - Google Patents
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Abstract
Description
本発明は、直流変電所における地絡電流検出装置及び地絡電流検出装置の施工方法に関する。 The present invention relates to a ground fault current detection device and a construction method of the ground fault current detection device in a DC substation.
電鉄用直流変電所等では、直流機器が収納された直流キュービクルにおいて、収納された整流器によって三相交流電圧を直流電圧に変換し、直流高速度遮断器により電車線に送電している。このような直流キュービクルで地絡が発生した場合には、当該地絡時に発生する電圧を、直流高圧接地継電器により検出して、直流高速度遮断器で直流電圧及び電流を遮断することにより、地絡事故から直流変電所を保護している。 In a DC substation for electric railways, etc., in a DC cubicle in which DC equipment is stored, a three-phase AC voltage is converted into a DC voltage by a stored rectifier and is transmitted to a train line by a DC high-speed circuit breaker. When a ground fault occurs in such a DC cubicle, the voltage generated at the time of the ground fault is detected by a DC high-voltage grounding relay, and the DC voltage and current are interrupted by a DC high-speed circuit breaker. It protects the DC substation from a cable accident.
但し、従来の直流高圧接地継電器による直流変電所の保護において、高抵抗地絡等の不完全な地絡では、直流高圧接地継電器側の電圧上昇が小さく、直流高圧接地継電器は動作しない。このため、電圧検出以外の地絡電流を検出することにより、冗長性を持たせることが求められる。 However, in the protection of the DC substation by the conventional DC high-voltage grounding relay, the voltage rise on the DC high-voltage grounding relay side is small and the DC high-voltage grounding relay does not operate in the case of incomplete grounding such as high resistance grounding. For this reason, it is required to provide redundancy by detecting a ground fault current other than voltage detection.
このような地絡電流の検出に関して、整流器や直流高速度遮断器の筐体である直流キュービクル等に設けられた接地線に流れる地絡電流を直流変流器で検出して地絡事故を検出し、直流高速度遮断器で直流電圧及び電流を遮断することにより、地絡事故から直流変電所を保護する装置が開示されている（特許文献１及び２参照）。 Regarding detection of such ground fault current, a ground fault is detected by detecting the ground fault current flowing in the ground wire provided in the DC cubicle etc. that is the housing of the rectifier and DC high speed circuit breaker with a DC current transformer. And the apparatus which protects a DC substation from a ground fault accident by interrupting | blocking DC voltage and an electric current with a DC high-speed circuit breaker is disclosed (refer patent documents 1 and 2).
一般に、直流キュービクルに設けられる接地線は、１本ではなく、２本の接地線を設け、それぞれの地絡線に流れる地絡電流を２つの直流変流器で監視することにより、直流キュービクル内の接地母線の断線や、接地線自体の断線等が発生した場合であっても、一方の接地線に流れる地絡電流を直流変流器で検出することができ、地絡事故から直流変電所を保護することが保安上求められる。 In general, the ground line provided in the DC cubicle is not one, but two ground lines are provided, and the ground fault current flowing through each ground fault line is monitored by two DC current transformers. Even if the ground bus is disconnected or the ground wire itself is disconnected, the ground fault current that flows through one of the ground lines can be detected by a DC current transformer. It is required for security to protect.
しかしながら、直流キュービクルに設けられる接地線を２本にすると、直流変電所における迷走電流、整流時の脈流成分である交流電流、近接する交流ケーブルにより誘導される誘導電流等が、一つの接地線を介して直流キュービクルに流れ込み、また他の接地線を介して、直流キュービクルと鉄筋などの躯体との電気的なつながりによって大地に流れ出す場合があり、当該接地線を流れる地絡電流を検出する際の非対称な電流やノイズとなってしまう。 However, if two ground wires are provided in the DC cubicle, the stray current in the DC substation, the AC current that is the pulsating current component during rectification, the induced current induced by the adjacent AC cable, etc. When the ground fault current flowing through the grounding wire is detected, it may flow into the ground due to the electrical connection between the DC cubicle and the steel frame such as a reinforcing bar. Asymmetrical current and noise.
このようなネット状回路の電流の中の２本の配線は、理想的には、２つの直流変流器で検出された地絡電流を相殺することにより除去できるはずであるが、実際には、２つの直流変流器間のネット状回路の電流の非対称性や変流器の特性のばらつき等により、真の漏洩電流と地絡電流を検出することができない。 Two wires in the current of such a net-like circuit should ideally be removed by canceling the ground fault current detected by the two DC current transformers. The true leakage current and ground fault current cannot be detected due to the asymmetry of the current in the net-like circuit between the two DC current transformers and the variation in the characteristics of the current transformers.
このため、直流キュービクル内の故障の予兆を捉えるために、２本の接地線に流れる数ｍＡ程度の微小電流を検出しようとした場合、当該微小電流は迷走電流等に起因するノイズに埋もれて検出できず、直流キュービクル内の故障の予兆を捉えることができないといった問題点があった。 For this reason, when trying to detect a minute current of about several mA flowing through two ground lines in order to detect a sign of a failure in the DC cubicle, the minute current is detected by being buried in noise caused by a stray current or the like. There was a problem that it was not possible to catch a sign of a failure in the DC cubicle.
本発明の課題は、直流キュービクルに、保安上、２本の接地線を設けた場合であっても、直流キュービクル内の故障の予兆を捉えるための微小電流を検出することができる地絡電流検出装置及び地絡電流検出装置の施工方法を提供することにある。 An object of the present invention is to detect a ground fault current that can detect a minute current for detecting a sign of a failure in a DC cubicle even when two ground lines are provided in the DC cubicle for safety reasons. It is providing the construction method of an apparatus and a ground-fault current detection apparatus.
上記課題を達成するため、この発明は、
直流機器が収納された直流キュービクルの下部に敷設され、当該直流キュービクルと大地との間を絶縁する絶縁材と、
前記直流キュービクルの接地母線を大地に接続する２本の接地線と、
前記２本の接地線にそれぞれ流れる地絡電流を一箇所で検出する電流検出手段と、
を備えるようにしたものである。
In order to achieve the above object, the present invention provides:
An insulating material that is laid at the bottom of the DC cubicle containing the DC device and insulates between the DC cubicle and the ground;
Two ground wires connecting the ground bus of the DC cubicle to the ground;
Current detecting means for detecting a ground fault current flowing through each of the two ground wires in one place;
Is provided.
直流機器が収納された直流キュービクルの下部に当該直流キュービクルと大地との間を絶縁する絶縁材を敷設し、２本の接地線で直流キュービクルの接地母線を大地に接続し、１つの電流検出手段で２本の接地線にそれぞれ流れる地絡電流を一箇所で検出することにより、直流キュービクルに、保安上、２本の接地線を設けた場合であっても、流れ込む迷走電流と、流れ出す迷走電流とは打ち消されて相殺されるので、ノイズを低減することができ、直流キュービクル内の故障の予兆を捉えるための微小電流を検出することができる。 Insulating material that insulates the DC cubicle from the ground is installed under the DC cubicle containing the DC equipment, and the ground bus of the DC cubicle is connected to the ground by two ground wires. By detecting the ground fault current that flows through each of the two ground wires at one location, even if two ground wires are provided in the DC cubicle for safety reasons, the stray current that flows in and the stray current that flows out Is canceled and canceled out, noise can be reduced, and a minute current for detecting a sign of a failure in the DC cubicle can be detected.
また、望ましくは、前記２本の接地線は、前記絶縁材を貫通して大地に接続するようにしたものである。
絶縁材を貫通させて大地に接地することにより、接地線を絶縁材上に敷設する必要がなくなるので、２本の接地線をできるだけ短い経路で施工することができる。
Preferably, the two ground lines are connected to the ground through the insulating material.
By grounding the insulating material through the ground, it is not necessary to lay the grounding wire on the insulating material, so that the two grounding wires can be constructed with the shortest possible path.
また、望ましくは、前記接地母線は、前記直流キュービクルの長手方向に敷設され、前記２本の接地線は、前記接地母線の両端に接続されるようにしたものである。
２本の接地線により接地母線を接地する場合、２本の接地線の一端は、接地母線の両端にそれぞれ接続することにより、直流キュービクル内の接地母線が断線した場合であっても、直流キュービクルで発生した地絡電流は、どちらか一方の接地線を介して大地に流れるので、確実に直流変電所を保護することができる。
Preferably, the ground bus is laid in the longitudinal direction of the DC cubicle, and the two ground wires are connected to both ends of the ground bus.
When the ground bus is grounded by two ground wires, one end of each of the two ground wires is connected to both ends of the ground bus so that even if the ground bus in the DC cubicle is disconnected, the DC cubicle Since the ground fault current generated in the current flows to the ground via one of the ground lines, the DC substation can be reliably protected.
また、望ましくは、前記電流検出手段は、貫通型の直流変流器であり、当該直流変流器の貫通孔の中心に前記２本の接地線を配線することで地絡電流を一箇所で検出するようにしたものである。
２本の接地線を、直流変流器の貫通孔の中心に配線するほどノイズを低減することができ、直流キュービクル内の故障の予兆を捉えるための微小電流を検出することができる。
Preferably, the current detection means is a through-type DC current transformer, and the two ground wires are wired at the center of the through-hole of the DC current transformer so that a ground fault current can be obtained at one location. It is intended to be detected.
As the two ground wires are wired to the center of the through hole of the DC current transformer, noise can be reduced, and a minute current for detecting a sign of a failure in the DC cubicle can be detected.
また、望ましくは、２つの部材により前記貫通孔に配線された前記２本の接地線を挟持すると共に、前記貫通孔に嵌合されることにより、前記２本の接地線を前記貫通孔の中心に固定する固定部材を有するようにしたものである。
地絡電流検出装置の施工の際に、２つの部材から構成される固定部材を用い、直流変流器の貫通孔に配線された２本の接地線を、両側から挟み込み、貫通孔に挿入することにより、２本の接地線を直流変流器の貫通孔の中心に確実に固定することができるので、ノイズを低減することができ、直流キュービクル内の故障の予兆を捉えるための微小電流を検出することができる。
Desirably, the two grounding wires wired to the through-hole by two members are sandwiched and fitted into the through-hole so that the two grounding wires are connected to the center of the through-hole. It has a fixing member fixed to it.
At the time of construction of the ground fault current detection device, two grounding wires wired to the through hole of the DC current transformer are sandwiched from both sides using a fixing member composed of two members and inserted into the through hole. As a result, the two ground wires can be securely fixed to the center of the through hole of the DC current transformer, so that noise can be reduced and a small current for capturing a sign of failure in the DC cubicle can be obtained. Can be detected.
また、望ましくは、前記固定部材は、前記貫通孔に嵌合した時に前記貫通孔の縁に掛止する突起部を備えるようにしたものである。
地絡電流検出装置の施工の際に、固定部材を用い、直流変流器の貫通孔に配線された２本の接地線を、両側から挟み込み、貫通孔に挿入する際に、突起部によって、直流変流器の貫通孔に確実に固定することができるので、ノイズを低減することができ、直流キュービクル内の故障の予兆を捉えるための微小電流を検出することができる。
Desirably, the fixing member includes a protrusion that is engaged with an edge of the through hole when the fixing member is fitted into the through hole.
At the time of construction of the ground fault current detection device, the fixing member is used, the two ground wires wired to the through hole of the DC current transformer are sandwiched from both sides, and when inserted into the through hole, Since it can be reliably fixed to the through hole of the DC current transformer, noise can be reduced, and a minute current for detecting a sign of a failure in the DC cubicle can be detected.
また、本出願の他の発明は、
直流機器が収納された直流キュービクルの下部に、当該直流キュービクルと大地との間を絶縁する絶縁材を敷設する絶縁工程と、
前記直流キュービクルの接地母線を２本の接地線で大地に接続する接地工程と、
前記２本の接地線を、前記２本の接地線にそれぞれ流れる地絡電流を一箇所で検出する電流検出手段に配線する配線工程と、
を含むようにしたものである。
In addition, other inventions of the present application are:
An insulating step of laying an insulating material that insulates the DC cubicle from the ground at the bottom of the DC cubicle in which the DC device is stored;
A grounding step of connecting the ground bus of the DC cubicle to the ground with two ground wires;
A wiring step of wiring the two ground wires to a current detecting means for detecting a ground fault current flowing in each of the two ground wires in one place;
Is included.
直流機器が収納された直流キュービクルの下部に当該直流キュービクルと大地との間を絶縁する絶縁材を敷設する絶縁工程と、２本の接地線で直流キュービクルの接地母線を大地に接続する接地工程と、前記２本の接地線を、前記２本の接地線にそれぞれ流れる地絡電流を一箇所で検出する電流検出手段に配線する配線工程と、を含むことにより、直流キュービクルに、保安上、２本の接地線を設けた場合であっても、流れ込む迷走電流と、流れ出す迷走電流とは打ち消されて相殺されるので、ノイズを低減することができ、直流キュービクル内の故障の予兆を捉えるための微小電流を検出することができる地絡電流検出装置の施工をすることができる。 An insulation process for laying an insulating material for insulation between the DC cubicle and the ground at a lower part of the DC cubicle in which the DC equipment is housed, and a grounding process for connecting the ground bus of the DC cubicle to the ground with two ground wires; Wiring the two ground wires to a current detecting means for detecting a ground fault current flowing through each of the two ground wires at a single location, thereby providing a DC cubicle with a safety Even when a grounding wire is provided, the stray current that flows in and the stray current that flows out are canceled out and canceled out, so noise can be reduced and a sign of failure in the DC cubicle can be captured. Construction of a ground fault current detection device capable of detecting a minute current can be performed.
本発明によれば、直流機器が収納された直流キュービクルの下部に当該直流キュービクルと大地との間を絶縁する絶縁材を敷設し、２本の接地線で直流キュービクルの接地母線を大地に接続し、１つの電流検出手段で２本の接地線にそれぞれ流れる地絡電流を一箇所で検出することにより、直流キュービクルに、保安上、２本の接地線を設けた場合であっても、流れ込む迷走電流と、流れ出す迷走電流とは打ち消されて相殺されるので、ノイズを低減することができ、直流キュービクル内の故障の予兆を捉えるための微小電流を検出することができる。 According to the present invention, an insulating material that insulates the DC cubicle from the ground is laid under the DC cubicle in which the DC equipment is housed, and the ground bus of the DC cubicle is connected to the ground by two ground wires. By detecting the ground fault current flowing in each of the two ground lines at one location with one current detection means, even if two ground lines are provided on the DC cubicle for security reasons, Since the current and the stray current that flows out are canceled and cancelled, noise can be reduced, and a minute current for detecting a sign of a failure in the DC cubicle can be detected.
［１．構成の説明］
以下、図面を参照しつつ、本発明の実施形態である地絡電流検出装置を詳細に説明する。但し、発明の範囲は、図示例に限定されない。
[1. Description of configuration]
Hereinafter, a ground fault current detection apparatus according to an embodiment of the present invention will be described in detail with reference to the drawings. However, the scope of the invention is not limited to the illustrated examples.
（実施形態）
本発明の実施形態の地絡電流検出装置の構成について図１を参照して説明する。図１は、地絡電流検出装置の構成の一例を示す概略構成図である。
図１に示すように、地絡電流検出装置１００（以下、単に装置１００と呼ぶ。）は、直流キュービクル１、絶縁材２、２本の接地線３、電流検出手段である直流変流器４を有する。
(Embodiment)
The structure of the ground fault current detection apparatus of embodiment of this invention is demonstrated with reference to FIG. FIG. 1 is a schematic configuration diagram illustrating an example of a configuration of a ground fault current detection device.
As shown in FIG. 1, a ground fault current detection device 100 (hereinafter simply referred to as device 100) includes a DC cubicle 1, an insulating material 2, two ground wires 3, and a DC current transformer 4 as current detection means. Have
直流キュービクル１は、母線ＢＳ１１に並列接続された断路器ＤＣ１１、直流高速度遮断器ＣＢ１１及びＣＢ１２、避雷器（図示せず）等の直流機器を、箱型の金属容器に収納したものであり、例えば、電鉄用直流変電所等であっては直流１５００Ｖの電圧を送出し、地絡事故や過負荷時には、直流高速度遮断器ＣＢ１１及びＣＢ１２等によって直流１５００Ｖの電圧及び電流を遮断することにより、直流変電所を保護する。
ちなみに、図１においては、３個の箱型の金属容器から直流キュービクル１が構成されているが、直流変電所の規模によっては数十個の箱型の金属容器から直流キュービクル１が構成される。
The DC cubicle 1 is a box-shaped metal container in which DC devices such as a disconnector DC11, DC high-speed circuit breakers CB11 and CB12, and a lightning arrester (not shown) connected in parallel to the bus BS11 are stored. In DC substations for railways, etc., a DC voltage of 1500V is sent, and in the event of a ground fault or overload, the DC high-speed circuit breakers CB11 and CB12 etc. cut off the DC 1500V voltage and current. Protect substations.
Incidentally, in FIG. 1, the DC cubicle 1 is composed of three box-shaped metal containers, but depending on the scale of the DC substation, the DC cubicle 1 is composed of several tens of box-shaped metal containers. .
絶縁材２は、このような直流機器が収納された直流キュービクル１の下部に敷設され、直流キュービクル１と大地ＥＴ１１との間を絶縁することにより、直流キュービクル１と大地ＥＴ１１との間に流れる地絡電流の流れるルートを２本の接地線３に制限させる。 The insulating material 2 is laid under the DC cubicle 1 in which such DC equipment is housed, and insulates between the DC cubicle 1 and the ground ET11, thereby flowing between the DC cubicle 1 and the ground ET11. The route through which the fault current flows is limited to two ground lines 3.
接地線３は、直流キュービクル１の長手方向に敷設された接地母線ＥＢ１１を大地ＥＴ１１に接続するケーブル等であり、例えば、直流キュービクル１内で地絡により発生する地絡電流や、直流機器の絶縁劣化に起因する地絡電流（漏洩電流）が、接地母線ＥＢ１１に流れ込んだ場合に、当該地絡電流を大地ＥＴ１１に流す。
具体的には、２本の接地線３の一端は、接地母線ＥＢ１１の両端にそれぞれ接続され、２本の接地線３の他端が、大地ＥＴ１１に接続（接地）される。また、２本の接地線３の中間部分はそれぞれ、１つの直流変流器４の貫通孔の中心に通される。
ちなみに、接地線３は、接地線３を絶縁材２上に敷設するのではなく、接地母線ＥＢ１１の両端部分で絶縁材２を貫通させて、１つの直流変流器４の貫通孔を通して大地ＥＴ１１に接地することにより、２本の接地線３を、できるだけ短い経路で施工することができる。
The ground wire 3 is a cable or the like for connecting the ground bus EB11 laid in the longitudinal direction of the DC cubicle 1 to the ground ET11. For example, a ground fault current generated by a ground fault in the DC cubicle 1 or insulation of a DC device When a ground fault current (leakage current) due to deterioration flows into the ground bus EB11, the ground fault current is passed through the ground ET11.
Specifically, one end of the two ground wires 3 is connected to both ends of the ground bus EB11, and the other end of the two ground wires 3 is connected (grounded) to the ground ET11. Further, the intermediate portions of the two ground wires 3 are respectively passed through the centers of the through holes of one DC current transformer 4.
Incidentally, the grounding wire 3 does not lay the grounding wire 3 on the insulating material 2 but penetrates the insulating material 2 at both ends of the grounding bus EB11 and passes through the through hole of one DC current transformer 4 to the ground ET11. It is possible to construct the two ground wires 3 through the shortest path possible by grounding them.
直流変流器４は、２本の接地線３に流れる直流電流を一箇所で高精度に検出する機器である。
具体的には、リングコアを励磁回路により常時励磁状態に保ち、検出回路とフィードバック回路を、バランス回路によりバランスさせておく。そして、リングコア内を通した２本の接地線３に直流電流（地絡電流）を流がれると、フィードバック回路のバランスが崩れるが、バランス回路が、検出回路とフィードバック回路とがバランスするように制御する。この制御の際に必要な信号の大きさが当該直流電流（地絡電流）の大きさに比例することを利用して、リングコア内を通した２本の接地線３に流れる直流電流（地絡電流）の値を検出する。
また、直流変流器４には、極性があり、直流電流（地絡電流）の流れる方向に応じて、正の電流値、或いは、負の電流値として検出される。例えば、当該極性と同じ方向に直流電流（地絡電流）が流れる場合は、正の電流値として検出され、一方、当該極性と逆方向に直流電流（地絡電流）が流れる場合は、負の電流値として検出される。
The DC current transformer 4 is a device that detects the DC current flowing through the two ground wires 3 with high accuracy at one location.
Specifically, the ring core is always kept in an excited state by an excitation circuit, and the detection circuit and the feedback circuit are balanced by a balance circuit. And if a direct current (ground fault current) flows through the two ground wires 3 that pass through the ring core, the balance of the feedback circuit will be lost, but the balance circuit will balance the detection circuit and the feedback circuit. Control. Using the fact that the magnitude of the signal required for this control is proportional to the magnitude of the direct current (ground fault current), the direct current (ground fault) flowing through the two ground wires 3 that pass through the ring core. Detect current value.
The DC current transformer 4 has polarity and is detected as a positive current value or a negative current value according to the direction in which the DC current (ground fault current) flows. For example, when a direct current (ground fault current) flows in the same direction as the polarity, it is detected as a positive current value. On the other hand, when a direct current (ground fault current) flows in the opposite direction to the polarity, a negative current value is detected. It is detected as a current value.
このような、直流変流器４の出力である電流検出信号は、制御手段である検出器ＤＴ１１に入力され、検出器ＤＴ１１は、例えば、入力された電流検出信号の値が、予め設定された閾値を超過した場合、地絡が発生したと判断し、直流高速度遮断器ＣＢ１１及びＣＢ１２等によって直流１５００Ｖの電圧及び電流を遮断させるように制御する。 Such a current detection signal that is the output of the DC current transformer 4 is input to a detector DT11 that is a control means, and the detector DT11 has a preset value of the input current detection signal, for example. When the threshold value is exceeded, it is determined that a ground fault has occurred, and control is performed so that the DC high-voltage circuit breakers CB11 and CB12 and the like block the DC 1500V voltage and current.
［２．地絡電流検出装置の動作の説明］
地絡電流検出装置１００の動作を図２及び図３を参照して説明する。
図２は、地絡電流検出装置１００の動作を説明する説明図であり、図２（ａ）は、接地線３に地絡電流以外の迷走電流等が流れた場合を示す説明図、図２（ｂ）は、接地線３に地絡電流が流れた場合を示す説明図である。
[2. Explanation of operation of ground fault current detection device]
The operation of the ground fault current detection apparatus 100 will be described with reference to FIGS.
FIG. 2 is an explanatory diagram for explaining the operation of the ground fault current detecting device 100, and FIG. 2 (a) is an explanatory diagram showing a case where a stray current other than the ground fault current flows through the ground wire 3. FIG. (B) is an explanatory view showing a case where a ground fault current flows through the grounding wire 3.
また、図３は、比較例である地絡電流検出装置の動作を説明する説明図である。図３に示す比較例である地絡電流検出装置１０１の基本的な構成は、装置１００と同じであり、異なる点は、２本の接地線３に流れる直流電流を１つの直流変流器４で検出するのではなく、２本の接地線３に流れる直流電流の電流値を、２つの直流変流器４でそれぞれ別個に検出する点である。 Moreover, FIG. 3 is explanatory drawing explaining operation | movement of the ground-fault current detection apparatus which is a comparative example. The basic configuration of the ground fault current detection device 101 which is a comparative example shown in FIG. 3 is the same as that of the device 100. The difference is that a direct current flowing through the two ground lines 3 is converted into one direct current transformer 4. In other words, the current values of the DC currents flowing through the two ground lines 3 are detected separately by the two DC current transformers 4.
図３の比較例に示すように、例えば、地絡電流以外の迷走電流ＣＴ３１が、大地ＥＴ１１から一方の接地線３を介して直流キュービクル１に流れ込み、接地母線ＥＢ１１を流れ、他方の接地線３を介して再び大地ＥＴ１１に流れ出す場合が想定される。
そして、上述の通り、２つの直流変流器４で検出された迷走電流ＣＴ３１の電流値を相殺したとしても、２つの直流変流器４間の特性のばらつき等により、当該迷走電流ＣＴ３１の影響を除去することはできずバックグラウンドのノイズとして残ってしまう。
As shown in the comparative example of FIG. 3, for example, a stray current CT31 other than the ground fault current flows from the ground ET11 into the DC cubicle 1 through one grounding wire 3, flows through the grounding bus EB11, and flows through the other grounding wire 3 It is assumed that it flows out to the ground ET11 again via
As described above, even if the current value of the stray current CT31 detected by the two DC current transformers 4 is offset, the influence of the stray current CT31 due to the variation in characteristics between the two DC current transformers 4 or the like. It cannot be removed and remains as background noise.
例えば、図４は、装置１０１の２つの直流変流器４における検出波形の一例を示す説明図であり、図５は、装置１０１の２つの直流変流器４における検出波形の他の一例を示す説明図である。 For example, FIG. 4 is an explanatory diagram illustrating an example of detection waveforms in the two DC current transformers 4 of the device 101, and FIG. 5 is another example of detection waveforms in the two DC current transformers 4 of the device 101. It is explanatory drawing shown.
図４は、直流キュービクル１と大地ＥＴ１１との間に絶縁材２を敷設しない場合であり、検出波形ＣＴ４１及び検出波形ＣＴ４２は、装置１０１の２つの直流変流器４におけるそれぞれの検出波形であり、検出波形ＣＴ４３は、検出波形ＣＴ４１と検出波形ＣＴ４２とが示す電流値を加算した波形である。
図４における波形ＣＴ４３から分かるように、直流キュービクル１と大地ＥＴ１１との間に絶縁材２を敷設しない場合、±２００ｍＡ以上のノイズとして残ってしまう。
これは、２つの直流変流器４間の特性のばらつき等のみならず、絶縁材２を敷設しないことにより、迷走電流ＣＴ３１が流れるルートを２本の接地線３に制限させることができないためである。
FIG. 4 shows a case where the insulating material 2 is not laid between the DC cubicle 1 and the ground ET11. The detection waveform CT41 and the detection waveform CT42 are detection waveforms in the two DC current transformers 4 of the device 101, respectively. The detection waveform CT43 is a waveform obtained by adding the current values indicated by the detection waveform CT41 and the detection waveform CT42.
As can be seen from the waveform CT43 in FIG. 4, when the insulating material 2 is not laid between the DC cubicle 1 and the ground ET11, noise of ± 200 mA or more remains.
This is because not only the variation in characteristics between the two DC current transformers 4 and the like, but also the route through which the stray current CT31 flows cannot be limited to the two ground wires 3 by not laying the insulating material 2. is there.
また、図５は、直流キュービクル１と大地ＥＴ１１との間に絶縁材２を敷設した場合であり、検出波形ＣＴ５１及び検出波形ＣＴ５２は、装置１０１の２つの直流変流器４におけるそれぞれの検出波形であり、検出波形ＣＴ５３は、検出波形ＣＴ５１と検出波形ＣＴ５２とが示す電流値を加算した波形である。
図５における波形ＣＴ５３から分かるように、直流キュービクル１と大地ＥＴ１１との間に絶縁材２を敷設した場合、図４と比較して改善されているものの、８ｍＡ程度のノイズとして残ってしまう。
FIG. 5 shows a case where the insulating material 2 is laid between the DC cubicle 1 and the ground ET11. The detection waveform CT51 and the detection waveform CT52 are detected waveforms of the two DC current transformers 4 of the apparatus 101, respectively. The detection waveform CT53 is a waveform obtained by adding the current values indicated by the detection waveform CT51 and the detection waveform CT52.
As can be seen from the waveform CT53 in FIG. 5, when the insulating material 2 is laid between the DC cubicle 1 and the ground ET11, although it is improved as compared with FIG. 4, it remains as noise of about 8 mA.
これに対して、図２（ａ）に示すように、装置１００では、１つの直流変流器４により２本の接地線３に流れる直流電流を検出する構成のため、比較例と同様に、地絡電流以外の迷走電流ＣＴ２１が、大地ＥＴ１１から一方の接地線３を介して直流キュービクル１に流れ込み、接地母線ＥＢ１１を流れ、他方の接地線３を介して再び大地ＥＴ１１に流れ出す場合、流れ込む迷走電流ＣＴ２１と、流れ出す迷走電流ＣＴ２１とは打ち消されて相殺されてしまいノイズにならない。また、１つの直流変流器４で電流値を検出するため、比較例のような特性のばらつき等の問題は発生しない。 On the other hand, as shown in FIG. 2 (a), the apparatus 100 is configured to detect the direct current flowing through the two ground lines 3 by one direct current transformer 4, and therefore, as in the comparative example, When the stray current CT21 other than the ground fault current flows from the ground ET11 to the DC cubicle 1 through one ground wire 3, flows through the ground bus EB11, and flows again to the ground ET11 through the other ground wire 3, the stray current that flows in The current CT21 and the stray current CT21 that flows out are canceled out and cancelled, and no noise is generated. In addition, since the current value is detected by one DC current transformer 4, problems such as characteristic variations as in the comparative example do not occur.
例えば、図６は、本実施の形態に係る地絡電流検出装置の検出波形の一例を示す説明図である。 For example, FIG. 6 is an explanatory diagram illustrating an example of a detection waveform of the ground fault current detection device according to the present embodiment.
図６において、検出波形ＣＴ６１は、装置１００の１つの直流変流器４における検出波形であり、波形ＣＴ６２は、検出器ＤＴ１１において、検出波形ＣＴ６１に対して、１秒間に１ｍＡの変化が継続した場合に、１ｍＡとして出力するマスク処理を施した波形である。
図６における検出波形ＣＴ６１から分かるように、１つの直流変流器４により２本の接地線３に流れる直流電流を検出することにより、±３〜４ｍＡ程度のノイズまで低減され、検出器ＤＴ１１において上述のマスク処理を施すことにより、殆ど１ｍＡ以下のノイズに低減することができる。
In FIG. 6, a detection waveform CT61 is a detection waveform in one DC current transformer 4 of the apparatus 100, and the waveform CT62 has a change of 1 mA per second in the detector DT11 with respect to the detection waveform CT61. In this case, the waveform is subjected to mask processing for output as 1 mA.
As can be seen from the detected waveform CT61 in FIG. 6, by detecting the direct current flowing through the two ground lines 3 by one DC current transformer 4, the noise is reduced to about ± 3 to 4 mA, and the detector DT11 By performing the mask processing described above, it is possible to reduce the noise to almost 1 mA or less.
一方、図２（ｂ）に示すように、地絡ＳＴ２１が発生した場合には、地絡電流ＣＴ２２及びＣＴ２３は、それぞれ２本の接地線３を介して大地ＥＴ１１に流れ出す。この際、装置１００では、１つの直流変流器４により２本の接地線３に流れる直流電流を検出する構成のため、流れ出す地絡電流ＣＴ２２及びＣＴ２３は、打ち消されることなく確実に検出される。 On the other hand, as shown in FIG. 2B, when the ground fault ST21 occurs, the ground fault currents CT22 and CT23 flow out to the ground ET11 through the two ground lines 3, respectively. At this time, since the apparatus 100 is configured to detect the direct current flowing through the two ground lines 3 by the single direct current transformer 4, the ground fault currents CT22 and CT23 that flow out are reliably detected without being canceled. .
すなわち、装置１００では、１つの直流変流器４により２本の接地線３に流れる直流電流を検出する構成のため、流れ込む迷走電流ＣＴ２１と、流れ出す迷走電流ＣＴ２１とは打ち消されて相殺されてしまい、１ｍＡ以下のノイズに低減することができるので、直流機器の絶縁劣化に起因する電流値の小さな地絡電流（例えば、数ｍＡ程度）であっても検出可能である。 That is, in the apparatus 100, since the direct current flowing through the two ground lines 3 is detected by the single direct current transformer 4, the flowing stray current CT21 and the flowing stray current CT21 are canceled and offset. Since noise can be reduced to 1 mA or less, even a ground fault current having a small current value (for example, about several mA) due to insulation deterioration of a DC device can be detected.
以上のように、直流機器が収納された直流キュービクル１の下部に当該直流キュービクル１と大地ＥＴ１１との間を絶縁する絶縁材２を敷設し、２本の接地線３で直流キュービクル１の接地母線ＥＢ１１を大地ＥＴ１１に接続し、１つの直流変流器４で２本の接地線３にそれぞれ流れる地絡電流を一箇所で検出することにより、直流キュービクル１に、保安上、２本の接地線３を設けた場合であっても、流れ込む迷走電流と、流れ出す迷走電流とは打ち消されて相殺されるので、ノイズを低減することができ、直流キュービクル１内の故障の予兆を捉えるための微小電流を検出することができる。 As described above, the insulating material 2 that insulates between the DC cubicle 1 and the ground ET 11 is laid under the DC cubicle 1 in which the DC equipment is accommodated, and the ground bus of the DC cubicle 1 is formed by the two ground wires 3. By connecting the EB 11 to the ground ET11 and detecting a ground fault current flowing through each of the two ground wires 3 with one DC current transformer 4 at one location, the DC cubicle 1 has two ground wires for security purposes. 3, the flowing stray current and the flowing stray current are canceled out and canceled out, so that noise can be reduced and a minute current for capturing a sign of a failure in the DC cubicle 1. Can be detected.
なお、本発明の実施形態等の説明に際しては、２本の接地線３の一端は、接地母線ＥＢ１１の両端にそれぞれ接続され、２本の接地線３の他端が、大地ＥＴ１１に接続（接地）されているが、これは、直流キュービクル１内の接地母線ＥＢ１１の断線に対応するためである。
例えば、図７は、直流キュービクル１内の接地母線ＥＢ１１の詳細を説明する説明図であり、３個の箱型の金属容器ＣＢ７１、ＣＢ７２及びＣＢ７３内には、それぞれの金属容器の接地母線ＥＢ７１、ＥＢ７２及びＥＢ７３が、金属容器の長手方向に設けられている。
そして、直流キュービクル１の施工時に、接地母線ＥＢ７１と接地母線ＥＢ７２とを、ボンド線ＢＮ７１によって電気的に接続し、接地母線ＥＢ７２と接地母線ＥＢ７３とを、ボンド線ＢＮ７２によって電気的に接続することにより、直流キュービクル１の全体としての接地母線ＥＢ１１が直流キュービクルの長手方向に敷設される。
In the description of the embodiment of the present invention, one end of the two ground wires 3 is connected to both ends of the ground bus EB11, and the other end of the two ground wires 3 is connected to the ground ET11 (ground). This is to cope with the disconnection of the ground bus EB11 in the DC cubicle 1.
For example, FIG. 7 is an explanatory view for explaining the details of the ground bus EB11 in the DC cubicle 1. In the three box-shaped metal containers CB71, CB72, and CB73, the ground bus EB71 of each metal container, EB72 and EB73 are provided in the longitudinal direction of the metal container.
When the DC cubicle 1 is constructed, the ground bus EB71 and the ground bus EB72 are electrically connected by the bond line BN71, and the ground bus EB72 and the ground bus EB73 are electrically connected by the bond line BN72. The ground bus EB11 as a whole of the DC cubicle 1 is laid in the longitudinal direction of the DC cubicle.
このため、２本の接地線３により接地母線ＥＢ１１を接地する場合、２本の接地線３の一端を接地母線ＥＢ１１の両端にそれぞれ接続することにより、ボンド線ＢＮ７１若しくはボンド線ＢＮ７２が断線した場合であっても、直流キュービクル１で発生した地絡電流は、どちらか一方の接地線３を介して大地ＥＴ１１に流れるため、確実に直流変電所を保護することができる。 Therefore, when the ground bus EB11 is grounded by the two ground wires 3, the bond line BN71 or the bond line BN72 is disconnected by connecting one end of each of the two ground wires 3 to both ends of the ground bus EB11. Even so, the ground fault current generated in the DC cubicle 1 flows to the ground ET11 via one of the ground wires 3, so that the DC substation can be reliably protected.
また、２本の接地線３を直流変流器４の貫通孔に配線する際には、ノイズを低減するために、貫通孔の中心に配線することが望ましい。
例えば、図８は、本実施の形態に係る地絡電流検出装置の接地線の配線位置による誤差の一例を示す説明図である。
図８中の楕円形は、直流変流器４の貫通孔の形状を示しており、縦軸及び横軸は、２本の接地線３を配線した貫通孔の位置を示している。
また、図８中、「丸の中に×印」は、接地線３を流れる電流が、図面手前から図面裏面に向けて流れることを示し、一方、「丸の中に点」は、接地線３を流れる電流が、図面裏面から図面手前に向けて流れることを示している。
さらに、「丸の中に×印」及び「丸の中に点」の近傍の数値は、２本の接地線３を当該位置に配線した場合のノイズの電流値（ｍＡ）を示している。
Further, when wiring the two ground wires 3 to the through hole of the DC current transformer 4, it is desirable to wire at the center of the through hole in order to reduce noise.
For example, FIG. 8 is an explanatory diagram illustrating an example of an error due to the wiring position of the ground wire of the ground fault current detection device according to the present embodiment.
The ellipse in FIG. 8 shows the shape of the through hole of the DC current transformer 4, and the vertical axis and the horizontal axis show the position of the through hole in which the two ground wires 3 are wired.
In FIG. 8, “X in a circle” indicates that the current flowing through the grounding wire 3 flows from the front of the drawing toward the back of the drawing, while “the dot in the circle” indicates the grounding wire. It is shown that the current flowing through 3 flows from the back of the drawing toward the front of the drawing.
Furthermore, the numerical values in the vicinity of “X in circle” and “dot in circle” indicate the noise current value (mA) when two ground wires 3 are wired at the corresponding positions.
図８から分かるように、例えば、ＰＳ８１の位置に２本の接地線３を配線した場合、ノイズは、０．２ｍＡ程度であり、同様にＰＳ８２の位置に２本の接地線３を配線した場合、ノイズは、１．４ｍＡ程度である。このため、貫通孔の中心ほどノイズが小さくなっており、２本の接地線３を直流変流器４の貫通孔に配線する際には、ノイズを低減するために、貫通孔の中心に配線することが望ましいことが分かる。 As can be seen from FIG. 8, for example, when two ground lines 3 are wired at the position of PS81, the noise is about 0.2 mA, and similarly when two ground lines 3 are wired at the position of PS82. The noise is about 1.4 mA. For this reason, noise becomes smaller toward the center of the through hole, and when wiring the two ground wires 3 to the through hole of the DC current transformer 4, wiring is performed at the center of the through hole in order to reduce noise. It turns out to be desirable.
また、２本の接地線３を直流変流器４の貫通孔の中心に確実に配線するため、施工時等において固定部材を用いることが望ましい。
例えば、図９は、本実施の形態に係る地絡電流検出装置の接地線を固定する固定部材の一例を示す説明図である。
図９に示すように、固定部材ＰＴは２つの部材ＰＴ９１及びＰＴ９２から構成され、直流変流器４の貫通孔ＨＬ９１に配線された２本の接地線３を、部材ＰＴ９１及びＰＴ９２でＳＤ９１及びＳＤ９２に示すように両側から挟み込み、ＩＮ９１に示すように貫通孔ＨＬ９１に挿入する。
ちなみに、部材ＰＴ９１及びＰＴ９２で、２本の接地線３を両側から挟み込んだ状態で、２本の接地線３が固定部材ＰＴの中心に固定されると共に、当該状態における２本の接地線に対する垂直面の形状が、貫通孔ＨＬ９１と略同じ形状であるので、容易に貫通孔ＨＬ９１に挿入することができ、２本の接地線３を直流変流器４の貫通孔の中心に確実に固定することができる。
すなわち、装置１００の施工の際に、２つの部材ＰＴ９１及びＰＴ９２から構成される固定部材ＰＴを用い、直流変流器４の貫通孔ＨＬ９１に配線された２本の接地線３を、両側から挟み込み、貫通孔ＨＬ９１に挿入することにより、２本の接地線３を直流変流器４の貫通孔の中心に確実に固定することができるので、ノイズを低減することができる。
Further, in order to reliably wire the two ground wires 3 to the center of the through hole of the DC current transformer 4, it is desirable to use a fixing member during construction.
For example, FIG. 9 is an explanatory diagram illustrating an example of a fixing member that fixes the ground wire of the ground fault current detection device according to the present embodiment.
As shown in FIG. 9, the fixing member PT is composed of two members PT91 and PT92, and the two ground wires 3 wired to the through hole HL91 of the DC current transformer 4 are connected to the members PT91 and PT92 by SD91 and SD92. And is inserted into the through hole HL91 as indicated by IN91.
Incidentally, with the members PT91 and PT92 sandwiching the two grounding wires 3 from both sides, the two grounding wires 3 are fixed to the center of the fixing member PT and are perpendicular to the two grounding wires in this state. Since the shape of the surface is substantially the same as the through hole HL91, it can be easily inserted into the through hole HL91, and the two ground wires 3 are securely fixed to the center of the through hole of the DC current transformer 4. be able to.
That is, at the time of construction of the apparatus 100, two grounding wires 3 wired to the through hole HL91 of the DC current transformer 4 are sandwiched from both sides using a fixing member PT composed of two members PT91 and PT92. Since the two ground wires 3 can be reliably fixed to the center of the through hole of the DC current transformer 4 by being inserted into the through hole HL91, noise can be reduced.
また、２本の接地線３を直流変流器４の貫通孔の中心に確実に固定するための固定部材は、当該貫通孔に挿入した時に貫通孔の縁に引っかかって、それ以上挿入できない突起部を備えることが望ましい。
例えば、図９に示すように、固定部材ＰＴを構成する部材ＰＴ９１及びＰＴ９２に突起ＧＤ９１及びＧＤ９２を設けて、直流変流器４の貫通孔ＨＬ９１に配線された２本の接地線３を、両側から挟み込み、貫通孔ＨＬ９１に挿入した時に、突起ＧＤ９１及びＧＤ９２で形成される突起部ＧＤが、貫通孔ＨＬ９１の縁に引っかかって、それ以上挿入できなくなるようにする。
すなわち、装置１００の施工の際に、固定部材ＰＴを用い、直流変流器４の貫通孔ＨＬ９１に配線された２本の接地線３を、両側から挟み込み、貫通孔ＨＬ９１に挿入する際に、突起ＧＤ９１及びＧＤ９２で形成される突起部ＧＤによって、必要以上に貫通孔ＨＬ９１に入り込むことなく、直流変流器４の貫通孔に２本の接地線３を確実に固定することがきる。
ちなみに、図９に示す突起部ＧＤは、貫通孔ＨＬ９１の縁に沿って連続して形成されているが、貫通孔ＨＬ９１の縁に引っかかって、それ以上挿入できなくなる機能を実現できれば、突起部ＧＤは、部分的に形成されるものであっても良い。
Further, the fixing member for securely fixing the two grounding wires 3 to the center of the through hole of the DC current transformer 4 is a protrusion that is caught by the edge of the through hole when inserted into the through hole and cannot be inserted any more. It is desirable to provide a section.
For example, as shown in FIG. 9, protrusions GD91 and GD92 are provided on members PT91 and PT92 constituting the fixing member PT, and two ground wires 3 wired to the through hole HL91 of the DC current transformer 4 are connected to both sides. The protrusion GD formed by the protrusions GD91 and GD92 is caught by the edge of the through-hole HL91 and cannot be inserted any more when inserted into the through-hole HL91.
That is, when the apparatus 100 is constructed, the two grounding wires 3 wired to the through hole HL91 of the DC current transformer 4 are sandwiched from both sides using the fixing member PT, and inserted into the through hole HL91. The protrusions GD formed by the protrusions GD91 and GD92 can reliably fix the two ground wires 3 to the through holes of the DC current transformer 4 without entering the through holes HL91 more than necessary.
Incidentally, the protrusion GD shown in FIG. 9 is formed continuously along the edge of the through hole HL91. However, if the function of being caught by the edge of the through hole HL91 and being unable to be inserted further can be realized, the protrusion GD May be partially formed.
１ 直流キュービクル
２ 絶縁材
３ 接地線
４ 直流変流器（電流検出手段）
ＤＴ１１ 検出器
ＢＳ１１ 母線
ＥＢ１１ 接地母線
ＥＴ１１ 大地
ＰＴ 固定部材
ＧＤ 突起部
1 DC cubicle 2 Insulating material 3 Grounding wire 4 DC current transformer (current detection means)
DT11 Detector BS11 Bus EB11 Ground bus ET11 Ground PT Fixed member GD Protrusion
Claims (7)
前記直流キュービクルの接地母線を大地に接続する２本の接地線と、
前記２本の接地線にそれぞれ流れる地絡電流を一箇所で検出する電流検出手段と、
を備えたことを特徴とする地絡電流検出装置。 An insulating material that is laid at the bottom of the DC cubicle in which the DC device is housed and insulates the DC cubicle from the ground;
Two ground wires connecting the ground bus of the DC cubicle to the ground;
Current detecting means for detecting a ground fault current flowing through each of the two ground wires in one place;
A ground fault current detection device comprising:
前記２本の接地線は、前記接地母線の両端に接続されることを特徴とする請求項１又は２に記載の地絡電流検出装置。 The ground bus is laid in the longitudinal direction of the DC cubicle;
The ground fault current detection device according to claim 1 or 2, wherein the two ground wires are connected to both ends of the ground bus.
前記直流キュービクルの接地母線を２本の接地線で大地に接続する接地工程と、
前記２本の接地線を、前記２本の接地線にそれぞれ流れる地絡電流を一箇所で検出する電流検出手段に配線する配線工程と、
を含むことを特徴とする地絡電流検出装置の施工方法。 An insulating step of laying an insulating material that insulates between the DC cubicle and the ground at the bottom of the DC cubicle in which the DC device is stored;
A grounding step of connecting the ground bus of the DC cubicle to the ground with two ground wires;
A wiring step of wiring the two ground wires to a current detecting means for detecting a ground fault current flowing in each of the two ground wires in one place;
The construction method of the ground fault current detection apparatus characterized by including.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53160724U (en) * | 1977-05-25 | 1978-12-16 | ||
| JPH0522811A (en) * | 1991-07-05 | 1993-01-29 | Toshiba Corp | Partial discharge detector |
| JPH09152456A (en) * | 1995-11-30 | 1997-06-10 | Fuji Electric Co Ltd | Device and method for detecting ground fault |
| JP2006129591A (en) * | 2004-10-28 | 2006-05-18 | Toshiba Mitsubishi-Electric Industrial System Corp | Power supply device |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53160724U (en) * | 1977-05-25 | 1978-12-16 | ||
| JPH0522811A (en) * | 1991-07-05 | 1993-01-29 | Toshiba Corp | Partial discharge detector |
| JPH09152456A (en) * | 1995-11-30 | 1997-06-10 | Fuji Electric Co Ltd | Device and method for detecting ground fault |
| JP2006129591A (en) * | 2004-10-28 | 2006-05-18 | Toshiba Mitsubishi-Electric Industrial System Corp | Power supply device |
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