JPH11235039A - Power conversion apparatus - Google Patents
Power conversion apparatusInfo
- Publication number
- JPH11235039A JPH11235039A JP2950098A JP2950098A JPH11235039A JP H11235039 A JPH11235039 A JP H11235039A JP 2950098 A JP2950098 A JP 2950098A JP 2950098 A JP2950098 A JP 2950098A JP H11235039 A JPH11235039 A JP H11235039A
- Authority
- JP
- Japan
- Prior art keywords
- converter
- current
- contactor
- ground
- circuit breaker
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Emergency Protection Circuit Devices (AREA)
- Rectifiers (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、交流を電源として
それを直流に変換する電力変換装置に係り、特に、該装
置の地絡に伴う対応技術に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power converter for converting an alternating current into a direct current by using an alternating current as a power source, and more particularly to a technology for dealing with a ground fault of the device.
【０００２】[0002]
【従来の技術】従来の交流を電源としてそれを直流に変
換する電力変換装置としては、例えば、特開昭63−1865
05号公報がある。同公報の電力変換装置は交流鉄道電気
車に特定されたものであり、それは図２に示される以下
のような構成を有する。2. Description of the Related Art A conventional power converter for converting an alternating current into a direct current using an alternating current as a power source is disclosed in, for example, JP-A-63-1865.
There is No. 05 publication. The power converter disclosed in the publication is specified for an AC railway electric vehicle, and has the following configuration shown in FIG.
【０００３】架線より交流電力を取り込むパンタグラフ
１と変圧器３の１次巻線４とは交流遮断器２が介在され
て接続され、変圧器３の１次巻線４の他方はレール（接
地）に接する車輪１５に接地ブラシ１３を介して接続さ
れる。変圧器３の２次巻線５の一端は接触器７を介して
単相コンバータ５１の交流入力端（ｕ相）に、２次巻線
５の他端は単相コンバータの交流入力端（ｖ相）に接続
される。接触器７の両端には充電抵抗器６と補助接触器
８の直列体が接続される。[0003] A pantograph 1 for taking in AC power from an overhead wire and a primary winding 4 of a transformer 3 are connected with an AC circuit breaker 2 interposed therebetween, and the other of the primary winding 4 of the transformer 3 is a rail (ground). Is connected via a ground brush 13 to a wheel 15 in contact with the vehicle. One end of the secondary winding 5 of the transformer 3 is connected to the AC input terminal (u phase) of the single-phase converter 51 via the contactor 7, and the other end of the secondary winding 5 is connected to the AC input terminal (v Phase). A series body of the charging resistor 6 and the auxiliary contactor 8 is connected to both ends of the contactor 7.
【０００４】単相コンバータ５１の直流出力端には、フ
ィルタコンデンサ１１，３相インバータ５２の直流側が
接続され、該インバータの交流側には電動機１２が接続
される。A DC output terminal of the single-phase converter 51 is connected to a filter capacitor 11 and a DC side of a three-phase inverter 52, and an AC motor 12 is connected to an AC side of the inverter.
【０００５】ここで、単相コンバータ５１は、ｕ相にお
いては、上アームが半導体スイッチング素子（以下、素
子と略す）２０ｕとフリーホイールダイオード２４ｕを
逆極性で並列接続した並列体から構成され、下アームも
同様に素子２１ｕとフリーホイールダイオード２５ｕか
ら構成され、同相アームは上下アームの直列体からなっ
ている。また、ｖ相においてもｕ相と同様に素子２０
ｖ，２１ｖ、及びフリーホイールダイオード２４ｖ，２
５ｖから構成される。[0005] Here, the single-phase converter 51 has, in the u-phase, an upper arm formed of a parallel body in which a semiconductor switching element (hereinafter abbreviated as an element) 20u and a freewheel diode 24u are connected in parallel with opposite polarities. The arm is also composed of an element 21u and a freewheel diode 25u, and the in-phase arm is composed of a series body of upper and lower arms. Also, in the v-phase, the device 20
v, 21v and freewheeling diodes 24v, 2
5v.
【０００６】一方、３相インバータ５２は、上記コンバ
ータと同様のアーム構成を有し、ｕ〜相の３相分の素子
３０ｕ，３１ｕ，３０ｖ，３１ｖ，３０ｗ，３１ｗとフ
リーホイールダイオード３４ｕ，３５ｕ，３４ｖ，３５
ｖ，３４ｗ，３５ｗから構成される。On the other hand, the three-phase inverter 52 has an arm configuration similar to that of the above-described converter, and includes elements 30u, 31u, 30v, 31v, 30w, 31w for three phases u to u and freewheel diodes 34u, 35u, 34v, 35
v, 34w, and 35w.
【０００７】また、単相コンバータ５１の直流側の一端
（図ではフィルタコンデンサのマイナス側）は、接地線
１４により接地ブラシ１３に接続（接地）され、該接地
線には地絡電流を検出する接地継電器５３が設けられ
る。[0007] One end of the single-phase converter 51 on the DC side (the negative side of the filter capacitor in the figure) is connected (grounded) to the grounding brush 13 by a grounding line 14, and a ground fault current is detected on the grounding line. A grounding relay 53 is provided.
【０００８】６０は、筺体でいわゆる制御装置内の機器
を納める制御箱であり同図記載のものでは単相コンバー
タ５１，３相インバータ５２，フィルタコンデンサ１
１，接触器７，充電抵抗器６，補助接触器８が筺体６０
に収納される。この筺体６０は電気的に接地ブラシ１３
に接続（接地）される。Reference numeral 60 denotes a control box for housing equipment in a so-called control device, which is a single-phase converter 51, a three-phase inverter 52, a filter capacitor 1
1, a contactor 7, a charging resistor 6, and an auxiliary contactor 8
Is stored in. The housing 60 is electrically connected to the ground brush 13.
(Ground).
【０００９】ここで、接触器７，充電抵抗器６及び補助
接触器８の機能は、フィルタコンデンサ１１が充電され
ていない状態から接触器７を投入すると過大な充電電流
が変圧器３から単相コンバータ５１に流れ込むことを防
止することにある。そこでフィルタコンデンサ１１を充
電するときには、まず補助接触器８を投入して充電抵抗
器６により制限された充電電流でフィルタコンデンサ１
１を充電し、ある程度の電荷が充電されてから接触器７
を投入する。Here, the functions of the contactor 7, the charging resistor 6, and the auxiliary contactor 8 are as follows. When the contactor 7 is turned on from a state where the filter capacitor 11 is not charged, an excessive charging current flows from the transformer 3 to the single-phase. The purpose is to prevent the flow into the converter 51. Therefore, when charging the filter capacitor 11, first, the auxiliary contactor 8 is turned on and the filter capacitor 1 is charged with the charging current limited by the charging resistor 6.
1 and a certain amount of charge is charged before contactor 7
Input.
【００１０】また、フィルタコンデンサ１１のマイナス
側と接地ブラシ５３間を接続する接続線１４に設けられ
る接地継電器５３の機能は、フィルタコンデンサ１１の
プラス側、又は単相コンバータ５１、又は３相インバー
タ等が地絡して接地ブラシ１３と同一の電位に電気的に
接続された場合に、地絡電流を検知して交流遮断器２を
開放して地絡電流が流れ続けることを防止するものであ
る。The function of the grounding relay 53 provided on the connection line 14 connecting the negative side of the filter capacitor 11 and the grounding brush 53 is as follows: the positive side of the filter capacitor 11 or the single-phase converter 51 or a three-phase inverter. When the ground fault occurs and the ground brush 13 is electrically connected to the same potential, the ground fault current is detected and the AC circuit breaker 2 is opened to prevent the ground fault current from continuing to flow. .
【００１１】[0011]
【発明が解決しようとする課題】図２の電力変換装置で
地絡事故が発生した場合を考える。前述のようにフィル
タコンデンサ１１のプラス側、又は単相コンバータ５
１、又は３相インバータ５２が地絡すると、接地継電器
５３が地絡電流を検出して、交流遮断器２を開放すると
同時に接触器７及び補助交流接触器８を開放する。その
後、運転を再開するために交流遮断器２を投入するが、
このときに地絡箇所がまだ取り除かれておらず、特にそ
の地絡箇所が２次巻線５と接触器７との間に発生してい
た場合には、接触器７，補助接触器８が開放されていて
も交流遮断器２の投入と同時に再度地絡が図２の矢印で
示した経路（筺体６０−接地線１４−フリーホイールダ
イオード２３ｖ−２次巻線５）で発生する。Consider a case in which a ground fault has occurred in the power converter of FIG. As described above, the plus side of the filter capacitor 11 or the single-phase converter 5
When the one or three-phase inverter 52 is grounded, the grounding relay 53 detects the ground fault current, and opens the AC circuit breaker 2 and simultaneously opens the contactor 7 and the auxiliary AC contactor 8. After that, the AC circuit breaker 2 is turned on to restart the operation.
At this time, if the ground fault has not yet been removed, and particularly if the ground fault has occurred between the secondary winding 5 and the contactor 7, the contactor 7 and the auxiliary contactor 8 will be removed. Even when the AC circuit breaker 2 is open, a ground fault occurs again along the path (housing 60-ground line 14-freewheel diode 23v-secondary winding 5) indicated by the arrow in FIG.
【００１２】このときの変圧器３の１次巻線には、２次
巻線側の地絡による電流と、交流遮断器２を投入する時
の電源位相とのタイミングによっては大きな励磁突入電
流も流れることになり、変圧器のコイルに機械的耐量を
超えた大きな電磁力が働き、変圧器が破損するという課
題があった。At this time, a large exciting inrush current flows through the primary winding of the transformer 3 depending on the timing between the current due to the ground fault on the secondary winding side and the power supply phase when the AC circuit breaker 2 is turned on. As a result, a large electromagnetic force exceeding the mechanical strength acts on the coil of the transformer, and there is a problem that the transformer is damaged.
【００１３】一般的に、変圧器に電源を投入するときに
１次巻線に励磁突入電流が流れ、それは電源投入時に最
も大きく時間と共に減少する。励磁突入電流の大きさ
は、電源電圧，電源位相，鉄心の残留磁気等により左右
され、同じ電源電圧であれば、電源位相０度，残留磁気
最大の時に最も大きく、例えば、１次巻線定格２０ｋ
Ｖ，８０Ａ，２次巻線定格９００Ｖ，７５０Ａ×２の鉄
道車両用変圧器の励磁突入電流は、１次電圧２３ｋＶの
ときに１次巻線に最大５５０Ａが流れる。Generally, when the power is supplied to the transformer, an inrush current flows through the primary winding, and the maximum inrush current is reduced with time when the power is supplied. The magnitude of the excitation inrush current depends on the power supply voltage, the power supply phase, the remanence of the iron core, and the like. If the power supply voltage is the same, the magnitude is the largest when the power supply phase is 0 degree and the remanence is maximum. 20k
When the primary voltage is 23 kV, the maximum inrush current of 550 A flows through the primary winding of the transformer for railcars of V, 80 A, secondary winding rated 900 V, 750 A × 2.
【００１４】したがって、交流遮断器２の投入時に地絡
電流と突入電流が重なる電流が変圧器に流れると定格電
流をはるかに越え、このような電流が流れても短時間で
あれば破壊しないだけの電気的，機械的耐量を有するよ
う設計する必要があり、特に電気車ではそれに伴う重量
の増加が問題となる。Therefore, when a current in which the ground fault current and the inrush current overlap with each other when the AC circuit breaker 2 is turned on flows through the transformer, the current far exceeds the rated current. It is necessary to design so as to have the electrical and mechanical withstand capability, and particularly in an electric vehicle, there is a problem that the weight increases accordingly.
【００１５】そこで本願発明の目的は、電力変換装置の
如何なる場所で地絡事故が発生してもその地絡による電
流を確実に遮断すると共に、地絡事故が発生して交流遮
断器が開放した後に、接地箇所が取り除かれないままに
再度交流遮断器が投入されたとしても、変圧器に励磁突
入電流と地絡電流が重なり合って流れる過大電流を防止
することにある。Therefore, an object of the present invention is to reliably cut off the current caused by a ground fault even if a ground fault occurs in any place of the power converter, and to open the AC circuit breaker due to the ground fault. Even if the AC circuit breaker is turned on again without removing the grounding portion later, it is an object of the present invention to prevent an excessive current flowing through the transformer by overlapping the inrush current and the ground fault current.
【００１６】[0016]
【課題を解決するための手段】本願発明は、半導体スイ
ッチング素子にフリーホイールダイオードが逆極性で並
列接続された並列体を複数個直列接続した直列体を２組
有して交流を直流に変換する単相コンバータと、単相交
流電源が交流遮断器を介して１次巻線に、単相コンバー
タの交流側両端が第１と第２の接触器を介してそれぞれ
２次巻線の両端に接続された変圧器と、単相コンバータ
の直流側端子間に接続されたフィルタコンデンサと、少
なくとも第１，第２の接触器と単相コンバータ及びフィ
ルタコンデンサが収納された筺体と、単相コンバータの
直流側の一端及び筺体を接地線で接地する手段と、第２
の接触器に並列接続される抵抗器と、単相コンバータの
直流側の一端から接地への電流を検出する接地継電器
と、該接地継電器の検出値に応動して交流遮断器及び少
なくとも第１，第２の接触器の何れかを開放させる手段
とを備える。SUMMARY OF THE INVENTION According to the present invention, there are provided two sets of a plurality of parallel bodies in which a freewheel diode is connected in parallel with a reverse polarity to a semiconductor switching element in series. A single-phase converter and a single-phase AC power supply are connected to the primary winding via an AC circuit breaker, and both ends of the single-phase converter are connected to both ends of a secondary winding via first and second contactors, respectively. Transformer, a filter capacitor connected between the DC side terminals of the single-phase converter, a housing containing at least the first and second contactors, the single-phase converter and the filter capacitor, and a DC of the single-phase converter. Means for grounding one end of the side and the housing with a ground wire;
A resistor connected in parallel to the contactor, a grounding relay for detecting a current from one end on the DC side of the single-phase converter to ground, an AC circuit breaker in response to a detection value of the grounding relay, and at least a first Means for opening any of the second contactors.
【００１７】さらには、交流遮断器の投入に対して第１
の接触器の投入のタイミングを遅らせる手段を備える。[0017] Further, when the AC circuit breaker is turned on, the first operation is performed.
Means for delaying the turn-on timing of the contactor.
【００１８】これにより、前述の地絡事故と同様に２次
巻線５と接触器７との間で地絡が発生したとしても、接
地継電器からの信号により少なくとも第１の接触器が開
放されるので、図２で示した経路で流れる地絡電流を遮
断できる。また、接地箇所が取り除かれないままで交流
遮断器２が再投入された場合においても、第１と第２の
接触器により変圧器３の２次巻線５は開放されているた
め変圧器には励磁突入電流しか流れない。その後、第１
の接触器が投入された時点で地絡電流が流れ２次巻線は
短絡された状態になるが、このときには励磁突入電流は
減衰して消滅しているので励磁突入電流と短絡電流が同
時に流れることを防止できる。Thus, even if a ground fault occurs between the secondary winding 5 and the contactor 7 in the same manner as in the above-described ground fault, at least the first contactor is opened by a signal from the ground relay. Therefore, the ground fault current flowing through the path shown in FIG. 2 can be cut off. Further, even when the AC circuit breaker 2 is turned on again without removing the grounding point, the secondary winding 5 of the transformer 3 is opened by the first and second contactors, so that the transformer is not connected to the transformer. Only the inrush current flows. Then the first
When the contactor is turned on, a ground fault current flows and the secondary winding is short-circuited, but at this time, the exciting rush current is attenuated and disappears, so the exciting rush current and the short-circuit current flow simultaneously. Can be prevented.
【００１９】[0019]
【発明の実施の形態】以下，本発明の実施形態を図面を
用いて説明する。Embodiments of the present invention will be described below with reference to the drawings.
【００２０】図１は、本発明に基づく鉄道電気車の電力
変換装置に応用した一実施形態を示す。なお、図１の基
本構成は図２と同じで同一符号で示しており、その詳細
な説明は前述しているので省略する。図２と構成的に異
なるところは、変圧器３の２次巻線５と単相コンバータ
５１との接続部分と、接地線１４にスイッチを設けたこ
とである。FIG. 1 shows an embodiment applied to a power converter of a railway electric vehicle according to the present invention. Note that the basic configuration of FIG. 1 is the same as that of FIG. 2 and is denoted by the same reference numerals, and detailed description thereof is omitted since it has been described above. The configuration differs from that of FIG. 2 in that a switch is provided on the connection between the secondary winding 5 of the transformer 3 and the single-phase converter 51 and on the ground line 14.
【００２１】変圧器３の２次巻線５の両端と単相コンバ
ータ５１の交流側両端子が第１の接触器９と第２の接触
器７を介してそれぞれ接続される。第２の接触器７の両
端には充電抵抗器６が並列接続される。Both ends of the secondary winding 5 of the transformer 3 and both terminals on the AC side of the single-phase converter 51 are connected via a first contactor 9 and a second contactor 7, respectively. The charging resistor 6 is connected in parallel to both ends of the second contactor 7.
【００２２】また、フィルタコンデンサ１１のマイナス
側と接地ブラシ１３は、スイッチ５４を介在させて接続
線１４で接続される。このスイッチ５４は電力変換装置
の絶縁試験用に設けられるもので、試験時には開放し、
定常動作時には投入されている。The negative side of the filter capacitor 11 and the ground brush 13 are connected by a connection line 14 via a switch 54. This switch 54 is provided for an insulation test of the power converter, and is opened at the time of the test.
It is turned on during normal operation.
【００２３】次に、上記電力変換装置の構成において本
発明の目的を達成させるための交流遮断器２と第１の接
触器と第２の接触器相互間における開閉動作機能につい
て説明する。Next, the switching operation function between the AC circuit breaker 2, the first contactor, and the second contactor for achieving the object of the present invention in the configuration of the power converter will be described.
【００２４】〈初期充電モード〉電動機１２に３相イン
バータ５２より可変周波数可変電圧の交流を給電し所定
のトルクを発生させて起動させるために、通常、フィル
タコンデンサ１１の直流電圧が所定値に達するまで待機
する。そこで、フィルタコンデンサ１１を初期充電する
場合には次のシーケンスで行う。<Initial Charging Mode> In order to supply the motor 12 with alternating current of variable frequency and variable voltage from the three-phase inverter 52 to generate a predetermined torque and start the motor, the DC voltage of the filter capacitor 11 usually reaches a predetermined value. Wait until. Therefore, the following sequence is performed when the filter capacitor 11 is initially charged.
【００２５】先ず、交流遮断器２を投入し、続いて第１
の接触器９を投入する。するとフィルタコンデンサ１１
には、２次巻線５の電圧が充電抵抗器６，フリーホイー
ルダイオード２４ｕ，２３ｖを介して印加され充電電流
が流れる。そして充電が完了した後第２の接触器７を投
入する。First, the AC circuit breaker 2 is turned on.
Of the contactor 9 is supplied. Then, the filter capacitor 11
, The voltage of the secondary winding 5 is applied through the charging resistor 6, the freewheeling diodes 24u and 23v, and the charging current flows. After charging is completed, the second contactor 7 is turned on.
【００２６】〈地絡、運転再開モード〉地絡の仮定とし
て従来技術では対応できなかった２次巻線５と第２の接
触器７との間で地絡事故が発生した場合とする。この場
合の地絡経路は、筺体６０−接地線１４−フリーホイー
ルダイオード２３ｖ−第１の接触器９−２次巻線５で地
絡電流が流れる。この時、接地継電器５３が地絡電流を
検出し、この検出に応動して交流遮断器２を開放すると
同時に第１及び第２の接触器９，７を開放する（地絡電
流を遮断する意味では必ずしもこのとき第２の接触器を
開放しなくともよい）。これによりこの経路の地絡電流
は遮断されることになる。<Ground fault, operation restart mode> It is assumed that a ground fault occurs between the secondary winding 5 and the second contactor 7, which cannot be dealt with by the prior art, as a ground fault assumption. In the ground fault path in this case, a ground fault current flows through the housing 60, the ground wire 14, the freewheel diode 23v, the first contactor 9 and the secondary winding 5. At this time, the grounding relay 53 detects the ground fault current, and in response to this detection, opens the AC circuit breaker 2 and simultaneously opens the first and second contactors 9 and 7 (meaning that the ground fault current is cut off). Then, it is not always necessary to open the second contactor at this time.) As a result, the ground fault current in this path is cut off.
【００２７】その後、地絡原因不明のままで上記地絡箇
所がまだ取り除かれていない状態で運転を再開する場合
がある。その時にも先ず交流遮断器２が投入される。こ
の時点ではまだ、第１と第２の接触器により変圧器３の
２次巻線５は投入されておらず開放状態を維持する。そ
れにより変圧器には１次巻線に励磁突入電流しか流れな
い。その後（所定時間後）、第１の接触器９を投入す
る。この時点で再度同じ経路で地絡電流が流れ２次巻線
は短絡された状態になるが、このときには励磁突入電流
は減衰して消滅しているので励磁突入電流と短絡電流が
同時に流れることはない。Thereafter, the operation may be restarted in a state where the ground fault location has not been removed yet with the ground fault cause unknown. At that time, the AC circuit breaker 2 is first turned on. At this time, the secondary winding 5 of the transformer 3 has not yet been turned on by the first and second contactors, and is kept open. As a result, only an inrush current flows through the primary winding of the transformer. Thereafter (after a predetermined time), the first contactor 9 is turned on. At this point, a ground fault current flows again along the same path, and the secondary winding is short-circuited. At this time, however, the exciting inrush current is attenuated and disappears. Absent.
【００２８】これにより、例え上記条件の最悪箇所での
地絡が発生し、これを無視して再運転の動作が実行され
たとしても地絡に伴う変圧器での過大電流の発生を防止
することができる。As a result, even if a ground fault occurs at the worst place under the above-mentioned conditions, and even if the operation is restarted ignoring this, an excessive current is prevented from being generated in the transformer due to the ground fault. be able to.
【００２９】なお、地絡事故が単相コンバータ５１や３
相インバータ５２側で発生している場合は、第１の接触
器９を投入した時点で該当部にかかる電圧は変圧器２次
巻線の電圧が充電抵抗器６を介したものとなるので上記
地絡条件での地絡電流は小さいものとなる。The ground fault is caused by the single-phase converter 51 or 3
When the voltage is generated on the phase inverter 52 side, the voltage applied to the corresponding portion at the time when the first contactor 9 is turned on is the voltage of the secondary winding of the transformer via the charging resistor 6. The ground fault current under the ground fault condition is small.
【００３０】したがって、接地箇所を取り除かずに再運
転を動作させた場合、接地継電器より地絡電流の大きさ
により接地箇所を見分けることができる。Therefore, when the restart operation is performed without removing the grounding portion, the grounding portion can be distinguished from the grounding relay by the magnitude of the ground fault current.
【００３１】以上本発明における交流遮断器２、第１及
び第２の接触器９，７の投入、遮断時のシーケンスを纏
めると次のようになる。The sequence when the AC circuit breaker 2 and the first and second contactors 9 and 7 are turned on and off according to the present invention is summarized as follows.
【００３２】投入順序：交流遮断器２−第１の接触器９
−第２の接触器７（９より所定時間遅らせる）遮断順序
（地絡時）：交流遮断器２、第１及び第２の接触器９，
７共にほぼ同時次に、本発明の第２の実施形態を図３よ
り説明する。図１と異なるところは、単相コンバータ５
１を３レベルのコンバータとしたことである。この単相
コンバータ５１は、ｕ相分として、素子２０ｕ〜２３
ｕ，フリーホイールダイオード２４ｕ〜２７ｕ、及びク
ランプダイオード２８ｕ，２９ｕから構成され、ｖ相分
として、素子２０ｖ〜２３ｖ，フリーホイールダイオー
ド２４ｖ〜２７ｖ、及びクランプダイオード２８ｖ，２
９ｖから構成される。２直列に接続されているクランプ
ダイオード２８ｕと２９ｕ、及び２８ｖと２９ｖの接続
点は、２直列に接続されているフィルタコンデンサ１１
ｐと１１ｎの接続点にそれぞれ接続されて中性点を構成
している。そしてこの３レベルのコンバータは、各相の
４直列に接続された素子のスイッチングの仕方により、
フィルタコンデンサ１１ｐのプラス側，中性点，フィル
タコンデンサの１１ｎのマイナス側の３つの電位を選択
して出力するものである。Order of application: AC circuit breaker 2-first contactor 9
A second contactor 7 (delayed by a predetermined time from 9) interruption sequence (at the time of ground fault): AC circuit breaker 2, first and second contactors 9,
Next, a second embodiment of the present invention will be described with reference to FIG. The difference from FIG. 1 is that the single-phase converter 5
1 is a three-level converter. The single-phase converter 51 converts the elements 20u to 23
u, freewheel diodes 24u to 27u, and clamp diodes 28u and 29u, and as v-phase components, elements 20v to 23v, freewheel diodes 24v to 27v, and clamp diodes 28v and 2v.
9v. The connection point between the clamp diodes 28u and 29u and 28v and 29v connected in series is connected to the filter capacitor 11 connected in series.
Each is connected to a connection point between p and 11n to form a neutral point. And this three-level converter depends on the switching method of the four series-connected elements of each phase.
The three potentials on the plus side of the filter capacitor 11p, the neutral point, and the minus side of the filter capacitor 11n are selected and output.
【００３３】接地構造としては、中性点を接地ブラシ１
３の電位に接続している。この例においては、２次巻線
５と第１の接触器７の間が地絡すると、地絡電流はフィ
ルタコンデンサ１１ｎを経由して流れることになるが、
従来例で問題となる地絡事故後の交流遮断器２の再投入
時には、先の地絡事故の時点でフィルタコンデンサ１１
ｎの電荷は全て放電してしまっており、再度の地絡発生
時の地絡電流の第１波は２次巻線を短絡したものと同等
の電流が流れるため、本発明により励磁突入電流と、地
絡電流が重なり合うことを防ぐことができる。As the grounding structure, the neutral point is set to the grounding brush 1
3 potential. In this example, when a ground fault occurs between the secondary winding 5 and the first contactor 7, a ground fault current flows through the filter capacitor 11n.
When the AC circuit breaker 2 is turned on again after a ground fault, which is a problem in the conventional example, the filter capacitor 11
n has been discharged, and the first wave of the ground fault current at the time of the occurrence of the ground fault again flows the same current as that obtained by short-circuiting the secondary winding. In addition, it is possible to prevent the ground fault currents from overlapping.
【００３４】なお、同図実施形態での接地構造として中
性点を接地するのが通常であるが、場合によってはフィ
ルタコンデンサのマイナス側が接地されることもある。
しかし接地構造が変わっても本発明による効果は何ら変
わることはない。Although the neutral point is usually grounded as the grounding structure in the embodiment of the figure, the negative side of the filter capacitor may be grounded in some cases.
However, the effect of the present invention does not change even if the grounding structure changes.
【００３５】[0035]
【発明の効果】本発明によれば地絡事故が発生して交流
遮断器が開放した後に，接地箇所が取り除かれないまま
に再度交流接触器を投入しても、変圧器に励磁突入電流
と変圧器の短絡電流が重なり合って流れ、変圧器のコイ
ルに過大な電磁力が働いて変圧器が破壊に至ることを防
ぐことができる。According to the present invention, even if the AC contactor is turned on again after the ground fault has occurred and the AC circuit breaker has been opened, and the grounding point has not been removed, the excitation inrush current and the transformer will be reduced. The short-circuit current of the transformer overlaps and flows, and the excessive electromagnetic force acts on the coil of the transformer, thereby preventing the transformer from being broken.
【図１】本発明の第１の実施形態を示す交流鉄道車両の
電力変換装置の構成図。FIG. 1 is a configuration diagram of a power converter of an AC railway vehicle according to a first embodiment of the present invention.
【図２】従来の交流鉄道車両の電力変換装置の構成図。FIG. 2 is a configuration diagram of a conventional power conversion device for an AC railway vehicle.
【図３】本発明の第２の実施形態を示す交流鉄道車両の
電力変換装置の構成図。FIG. 3 is a configuration diagram of a power conversion device for an AC railway vehicle according to a second embodiment of the present invention.
１…パンタグラフ、２…交流遮断器、３…変圧器、４…
１次巻線、５…２次巻線、６…充電抵抗器、７…第２の
接触器、９…第１の接触器、１１…フィルタコンデン
サ、１２…電動機、１３…接地ブラシ、１４…接地線、
１５…車輪、20ｕ，２０ｖ，２１ｕ，２１ｖ…スイッチ
ング素子、２４ｕ，２５ｕ，２２ｖ，23ｖ…フリーホイ
ールダイオード、５１…単相コンバータ、５２…３相イ
ンバータ、５３…接地継電器、５４…スイッチ。1: Pantograph, 2: AC circuit breaker, 3: Transformer, 4:
Primary winding, 5 Secondary winding, 6 Charge resistor, 7 Second contactor, 9 First contactor, 11 Filter capacitor, 12 Motor, 13 Ground brush, 14 Ground wire,
15 ... wheels, 20u, 20v, 21u, 21v ... switching elements, 24u, 25u, 22v, 23v ... freewheel diodes, 51 ... single-phase converters, 52 ... three-phase inverters, 53 ... ground relays, 54 ... switches.
Claims (4)
ダイオードが逆極性で並列接続された並列体を複数個直
列接続した直列体を２組有して交流を直流に変換する単
相コンバータと、単相交流電源が交流遮断器を介して１
次巻線に、前記コンバータの交流側両端が第１と第２の
接触器を介してそれぞれ２次巻線の両端に接続された変
圧器と、前記コンバータの直流側端子間に接続されたフ
ィルタコンデンサと、少なくとも前記第１，第２の接触
器と前記コンバータ及び前記フィルタコンデンサが収納
された筺体と、前記コンバータの直流側の一端及び前記
筺体を接地線で接地する手段と、前記第２の接触器に並
列接続される抵抗器と、前記コンバータの直流側の一端
から接地への電流を検出する接地継電器と、該接地継電
器の検出値に応動して前記交流遮断器及び少なくとも前
記第１，第２の接触器の何れかを開放させる手段とを備
えたことを特徴とする電力変換装置。1. A single-phase converter for converting alternating current to direct current, comprising two sets of serial bodies in which a plurality of parallel bodies in which freewheel diodes are connected in parallel with opposite polarities to semiconductor switching elements are connected in series. Power supply 1 via AC circuit breaker
A transformer connected between a secondary winding, both ends of the AC side of the converter via first and second contactors to both ends of a secondary winding, and a DC terminal connected between the DC side terminals of the converter, respectively. A capacitor, a housing in which at least the first and second contactors, the converter and the filter capacitor are housed, a means for grounding one end on the DC side of the converter and the housing with a ground wire; A resistor connected in parallel with the contactor, a grounding relay for detecting a current from one end of the converter on the DC side to ground, and the AC breaker and at least the first and the first in response to a detection value of the grounding relay. Means for opening any one of the second contactors.
に対して前記第１の接触器の投入のタイミングを遅らせ
る手段を備えたことを特徴とする電力変換装置。2. The power converter according to claim 1, further comprising means for delaying the timing of turning on the first contactor with respect to turning on the AC circuit breaker.
１の接触器と前記第２の接触器の投入において、少なく
とも第１に対して第２の接触器の投入のタイミングを遅
らせる手段とを備えたことを特徴とする電力変換装置。3. A means for delaying the timing of turning on the second contactor at least with respect to the first at the time of turning on the AC circuit breaker, the first contactor, and the second contactor according to claim 1. A power conversion device comprising:
動作時には閉じられ、試験時に開放されるスイッチが、
前記コンバータの直流側の一端と前記接地間を接続する
接地線間に介在されることを特徴とする電力変換装置。4. A switch according to claim 1, wherein said switch is closed during a normal operation of said converter and opened during a test.
A power converter, wherein the power converter is interposed between a ground line connecting between one end on the DC side of the converter and the ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2950098A JP3455797B2 (en) | 1998-02-12 | 1998-02-12 | Power converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2950098A JP3455797B2 (en) | 1998-02-12 | 1998-02-12 | Power converter |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2003029136A Division JP3843430B2 (en) | 2003-02-06 | 2003-02-06 | Power converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11235039A true JPH11235039A (en) | 1999-08-27 |
| JP3455797B2 JP3455797B2 (en) | 2003-10-14 |
Family
ID=12277811
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2950098A Expired - Lifetime JP3455797B2 (en) | 1998-02-12 | 1998-02-12 | Power converter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3455797B2 (en) |
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| JP2006311692A (en) * | 2005-04-27 | 2006-11-09 | Toshiba Corp | Rail vehicle drive controller |
| WO2009037782A1 (en) * | 2007-09-21 | 2009-03-26 | Mitsubishi Electric Corporation | Power converting device for electric vehicle |
| JP2010273455A (en) * | 2009-05-21 | 2010-12-02 | Toshiba Corp | Device for control of electric vehicle |
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| JP4540743B2 (en) * | 2007-09-21 | 2010-09-08 | 三菱電機株式会社 | Electric vehicle power converter |
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