JP5035520B2 - Ground fault protection discharge device - Google Patents

Ground fault protection discharge device Download PDF

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JP5035520B2
JP5035520B2 JP2007076142A JP2007076142A JP5035520B2 JP 5035520 B2 JP5035520 B2 JP 5035520B2 JP 2007076142 A JP2007076142 A JP 2007076142A JP 2007076142 A JP2007076142 A JP 2007076142A JP 5035520 B2 JP5035520 B2 JP 5035520B2
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discharger
ground fault
discharge
discharge device
wire
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JP2008236967A (en
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大司郎 熊野
一臣 佐々木
隆史 入山
憲市 上村
宏 前田
敏明 西川
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Shizuki Electric Co Inc
West Japan Railway Co
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Shizuki Electric Co Inc
West Japan Railway Co
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Description

この発明は、交流き電設備に地絡事故が発生した場合に地絡電流をレールまたは負き電線に流入させるための地絡保護用放電装置に関するものである。   The present invention relates to a ground fault protection discharge device for causing a ground fault current to flow into a rail or a negative wire when a ground fault occurs in an AC feeder.

交流き電変電所及び交流き電区分所では、一般に接地マットが設置され、き電変電所やき電区分所の各設備は、アース線が接地マットに接続されて接地されている。変電所やき電区分所において、トロリー線やき電線等に地絡事故が発生すると、接地抵抗により接地マットの電位が上がり、接地マットに接続された制御回路や通信回路等の弱電回路が絶縁破壊される可能性がある。このような絶縁破壊事故を防止するため、従来、地絡保護用放電装置が設けられている(特許文献1参照)。   In an AC feeder substation and an AC feeder section, a grounding mat is generally installed, and each facility in the feeder substation or feeder section is grounded by connecting a ground wire to the grounding mat. When a ground fault occurs in a trolley wire or feeder at a substation or feeder section, the grounding mat potential increases due to grounding resistance, and weak electrical circuits such as control circuits and communication circuits connected to the grounding mat break down. There is a possibility. In order to prevent such an insulation breakdown accident, a ground fault protection discharge device has been conventionally provided (see Patent Document 1).

オートトランス(AT)を設置したATき電方式では、図2に示すように、保護線31と接地マット32との間に地絡保護用放電装置10が設けられる。一般的に地絡保護用放電装置10は、図3に示すように、コンデンサ11と抵抗12とで構成されてサージ電圧を吸収するサージ吸収部13と、側路開閉器用コイル14を介して接続された側路開閉器15と、放電器20とをそれぞれ並列に接続することによって構成されている。交流き電変電所等でトロリー線33又はATき電線34に地絡事故が発生した場合、接地マット32の電位が上昇し放電器20のギャップに放電開始電圧以上の電圧が作用すると放電器20が放電する。これにより、接地マット32と保護線31とは短絡され、接地マット32は保護線31とほぼ同電位(ほぼ接地電位)となるので、接地マット32に接続されている制御回路や通信回路等のような弱電回路35の絶縁破壊を防ぐことができる。また、上記放電により、電流が側路開閉器用コイル14を流れることにより、側路開閉器15が閉じ、放電器20に流れていた電流をバイパスし、放電器20を保護する。バイパス電流はレール36及びATき電線34を介してき電回路に流れることにより、保護継電器37が働き遮断器38を開にして事故電流を遮断する。側路開閉器コイル15に事故電流が流れなくなると側路開閉器15が開き通常状態に戻る。
特開平10−166909号公報
In the AT feeding system in which an autotransformer (AT) is installed, a ground fault protection discharge device 10 is provided between a protective wire 31 and a grounding mat 32 as shown in FIG. Generally, as shown in FIG. 3, the ground fault protection discharge device 10 includes a capacitor 11 and a resistor 12 and is connected to a surge absorber 13 that absorbs a surge voltage, and a bypass switch coil 14. The bypass switch 15 and the discharger 20 are connected in parallel to each other. When a ground fault occurs in the trolley wire 33 or the AT feeder 34 at an AC feeder substation or the like, the potential of the grounding mat 32 rises and a voltage higher than the discharge start voltage acts on the gap of the discharger 20. Discharges. As a result, the grounding mat 32 and the protection line 31 are short-circuited, and the grounding mat 32 has substantially the same potential (substantially grounding potential) as the protection line 31, so that a control circuit, a communication circuit, or the like connected to the grounding mat 32 can be used. Such a breakdown of the weak electric circuit 35 can be prevented. Further, due to the discharge, a current flows through the coil 14 for the side switch, whereby the side switch 15 is closed, the current flowing to the discharger 20 is bypassed, and the discharger 20 is protected. The bypass current flows to the feeder circuit via the rail 36 and the AT feeder line 34, whereby the protective relay 37 operates to open the breaker 38 and interrupt the accident current. When the fault current no longer flows through the side switch coil 15, the side switch 15 opens and returns to the normal state.
Japanese Patent Laid-Open No. 10-166909

ところで、上記のような従来の地絡保護用放電装置では、放電器20を保護するために側路開閉器用コイル14及び側路開閉器15を設ける必要があり、装置が大型化するとともに側路開閉器15の保守作業が煩雑で労力を要するという難点があった。また、放電器20の放電耐力を向上させ、側路開閉器用コイル14と側路開閉器15との設置を省略することを着想したが、放電に対して、どの程度の時間的な耐量があれば、側路開閉器用コイル14と側路開閉器15との省略が可能であるのかが不明であるため容易に実現することは不可能である。また、放電器の保守を最適な時期に行い装置の機能維持を図ることも重要な課題であった。   By the way, in the conventional ground fault protection discharge device as described above, it is necessary to provide the side switch coil 14 and the side switch 15 in order to protect the discharger 20, which increases the size of the device and bypasses it. The maintenance work of the switch 15 was complicated and required labor. In addition, the idea was to improve the discharge tolerance of the discharger 20 and omit the installation of the coil 14 for the side switch and the side switch 15, but what is the time tolerance for the discharge? In this case, since it is unclear whether the bypass switch coil 14 and the bypass switch 15 can be omitted, it cannot be easily realized. It was also an important issue to maintain the function of the device by maintaining the discharger at an optimal time.

この発明は、上記従来の課題を解決するためになされたものであって、その目的は、側路開閉器用コイルと側路開閉器との設置を省略して装置の小型化を図ると共に、保守作業を軽減でき、また放電器の保守を最適な時期に行うことが可能な地絡保護用放電装置を提供することにある。   The present invention has been made to solve the above-described conventional problems, and its object is to reduce the size of the apparatus by omitting the installation of the coil for the side switch and the side switch, and to perform maintenance. An object of the present invention is to provide a ground fault protection discharge device capable of reducing work and maintaining a discharger at an optimal time.

そこで、この請求項1の地絡保護用放電装置は、交流き電変電所または交流き電区分所に設けられる設備のアース線が接続される接地マットと、この接地マットと保護線との間、または接地マットと負き電線との間に接続された放電器3と、この放電器3に並列に接続されレールのサージ電圧を吸収し放電器3の不要放電を防止するサージ吸収部2とを具備し、上記放電器3に並列に側路開閉器を設けることなく構成し、かつ上記放電器3の放電耐量を、電流20,000A以上、放電時間200msec以上とし、トロリー線またはき電線に地絡事故が発生した場合に上記接地マットと保護線または負き電線とがほぼ同電位になるよう構成したことを特徴としている。 Therefore, the ground fault protective discharge device according to claim 1 is a grounding mat to which a ground wire of an equipment provided in an AC feeder substation or an AC feeder section is connected, and between the ground mat and the protective wire. Or a discharger 3 connected between the grounding mat and the negative wire, and a surge absorber 2 connected in parallel to the discharger 3 to absorb the surge voltage of the rail and prevent unnecessary discharge of the discharger 3; comprising a, in parallel to the discharge vessel 3 constitutes without providing the bypass switch, and the discharge withstand current rating of the discharge device 3, the current 20,000A above, the discharge time 200msec or more, the trolley line or-out wire In the case where a ground fault occurs, the ground mat and the protective wire or the negative wire are configured to have substantially the same potential .

また、請求項2の地絡保護用放電装置は、上記放電器3の放電による電流を検出し、放電器の動作回数を計測する計測手段7を設けたことを特徴としている。   The ground fault protecting discharge device according to claim 2 is characterized in that a measuring means 7 for detecting a current due to discharge of the discharger 3 and measuring the number of operations of the discharger is provided.

上記請求項1の地絡保護用放電装置のように、電流20,000A以上、放電時間200msec以上の放電耐量を有する場合、従来のような側路開閉器用コイルと側路開閉器とを設置する必要はなく、そのためこれらを省略することが可能となることが明らかになった。そして、この結果、装置の小型化が図れると共に、保守作業が大幅に軽減される。   As in the case of the ground fault protection discharge device according to the first aspect of the present invention, in the case of having a discharge tolerance of a current of 20,000 A or more and a discharge time of 200 msec or more, a conventional side switch coil and a side switch are installed. It was not necessary, and it became clear that these could be omitted. As a result, the apparatus can be miniaturized and maintenance work can be greatly reduced.

請求項2の地絡保護用放電装置によれば、放電器3の正確な動作回数に基づいて、最適な時期に放電器3の保守を行うことができ、これにより常に地絡保護用放電装置の機能を最適な状態に維持し、設備を地絡事故から保護することができる。   According to the ground fault protection discharge device of the second aspect, maintenance of the discharge device 3 can be performed at an optimal time based on the exact number of operations of the discharge device 3, thereby always providing the ground fault protection discharge device. Can be maintained in an optimal state and the equipment can be protected from a ground fault.

次に、この発明の地絡保護用放電装置の具体的な実施の形態について、図面を参照しつつ詳細に説明する。図1は、この発明による地絡保護用放電装置の実施例を示す回路図である。この地絡保護用放電装置1においては、サージ吸収部2と放電器3とが並列に接続されている。サージ吸収部2は、コンデンサ4と抵抗5とを直列接続することによって構成され、レールのサージ電圧を吸収するようになっている。そして、このような構成、つまり側路開閉器用コイルと側路開閉器との設置を省略した構成を採用するためには、放電器3としては、放電の時間的な耐量がどの程度まで必要であるのかということについて検討した。その結果、放電器3に必要とされる放電耐力としては、電流20,000A以上、放電時間200msec以上、安価に製造するという点からすると好ましくは、電流20,000A以上、放電時間200〜300msecとすれば充分であることが明らかになった。   Next, specific embodiments of the ground fault protecting discharge device of the present invention will be described in detail with reference to the drawings. FIG. 1 is a circuit diagram showing an embodiment of a ground fault protecting discharge device according to the present invention. In this ground fault protection discharge device 1, the surge absorber 2 and the discharger 3 are connected in parallel. The surge absorber 2 is configured by connecting a capacitor 4 and a resistor 5 in series, and absorbs a rail surge voltage. And in order to employ | adopt such a structure, ie, the structure which abbreviate | omitted installation of the coil for a side switch, and a side switch, to what extent the time tolerance of discharge is required as the discharger 3 We examined whether there was. As a result, the discharge tolerance required for the discharger 3 is preferably 20,000 A or more, a discharge time of 200 msec or more, and preferably manufactured at a current of 20,000 A or more and a discharge time of 200 to 300 msec. It became clear that this was sufficient.

図1及び図2において、トロリー線33又はATき電線34に地絡事故が発生した場合、接地マット32の電位が上昇し放電器3のギャップに放電開始電圧以上の電圧が加わると放電器3が放電する。これにより、接地マット32と保護線31は短絡され、接地マット32は保護線31とほぼ同電位(ほぼ接地電位)になり、接地マット32に接続されている制御回路や通信回路等の接地側の電位上昇を抑えることができるので、弱電回路35の絶縁破壊を防ぐことができる。このとき、地絡電流はレール(軌条)36を介してき電回路に流れることにより、保護継電器37が働き遮断器38を開にして事故電流を遮断する。   In FIG. 1 and FIG. 2, when a ground fault occurs in the trolley wire 33 or the AT feeder 34, the potential of the ground mat 32 rises and a voltage higher than the discharge start voltage is applied to the gap of the discharger 3. Discharges. As a result, the grounding mat 32 and the protection line 31 are short-circuited, and the grounding mat 32 has substantially the same potential (substantially grounding potential) as the protection line 31, and the ground side of the control circuit, communication circuit, etc. connected to the grounding mat 32. Therefore, the dielectric breakdown of the weak electric circuit 35 can be prevented. At this time, the ground fault current flows through the rail (rail) 36 to the feeder circuit, so that the protective relay 37 operates to open the circuit breaker 38 and interrupt the accident current.

上記構成では、放電器3の放電の時間的耐量が高いため、従来のような側路開閉器用コイルと側路開閉器とを設置する必要はなく、そのためこれらを省略することが可能となる。そして、この結果、装置の小型化が図れると共に、保守作業が大幅に軽減される。   In the above configuration, since the time tolerance of the discharge of the discharger 3 is high, it is not necessary to install a side switch and a side switch as in the prior art, and therefore, these can be omitted. As a result, the apparatus can be miniaturized and maintenance work can be greatly reduced.

また、図1に示すように、放電器3の接地マット32側に電流検出器(CT)6を設け、その出力側をカウンタ7に接続し放電器3の動作回数を計測する。これにより、放電器3の正確な動作回数に基づいて、最適な時期に放電器3の保守を行うことができ、これにより常に地絡保護用放電装置1の機能を最適な状態に維持し、設備を地絡事故から保護することができる。   Further, as shown in FIG. 1, a current detector (CT) 6 is provided on the grounding mat 32 side of the discharger 3 and its output side is connected to a counter 7 to measure the number of operations of the discharger 3. Thereby, based on the exact frequency | count of operation of the discharger 3, the maintenance of the discharger 3 can be performed at the optimal time, and thereby, the function of the discharge device 1 for ground fault protection is always maintained in an optimal state, Equipment can be protected from ground faults.

以上にこの発明の地絡保護用放電装置につき、その実施形態の説明をしたが、この発明は上記実施形態に限定されるものではなく、種々変更して実施することが可能である。例えば、上記においては、オートトランス(AT)を設置したATき電方式についての説明をしたが、ブースタトランス(BT)を設置したBTき電方式にも適用することができる。BTき電方式の場合、地絡保護用放電装置1は負き電線と接地間に接続される。   Although the embodiment of the ground fault protection discharge device of the present invention has been described above, the present invention is not limited to the above embodiment, and can be implemented with various modifications. For example, in the above description, the AT feeding system in which an autotransformer (AT) is installed has been described, but the present invention can also be applied to a BT feeding system in which a booster transformer (BT) is installed. In the case of the BT feeding system, the ground fault protection discharge device 1 is connected between the negative wire and the ground.

この発明の地絡保護用放電装置の実施形態を示す回路図である。It is a circuit diagram which shows embodiment of the discharge device for ground fault protection of this invention. 地絡保護用放電装置の配置を示す全体構成の説明図である。It is explanatory drawing of the whole structure which shows arrangement | positioning of the discharge device for earth fault protection. 従来の地絡保護用放電装置の回路図である。It is a circuit diagram of the conventional discharge device for earth fault protection.

符号の説明Explanation of symbols

1・・・地絡保護用放電装置、2・・・サージ吸収部、3・・・放電器、6・・・電流検出器、7・・・カウンタ     DESCRIPTION OF SYMBOLS 1 ... Ground fault protection discharge device, 2 ... Surge absorption part, 3 ... Discharger, 6 ... Current detector, 7 ... Counter

Claims (2)

交流き電変電所または交流き電区分所に設けられる設備のアース線が接続される接地マットと、この接地マットと保護線との間、または接地マットと負き電線との間に接続された放電器(3)と、この放電器(3)に並列に接続されレールのサージ電圧を吸収し放電器(3)の不要放電を防止するサージ吸収部(2)とを具備し、上記放電器(3)に並列に側路開閉器を設けることなく構成し、かつ上記放電器(3)の放電耐量を、電流20,000A以上、放電時間200msec以上とし、トロリー線またはき電線に地絡事故が発生した場合に上記接地マットと保護線または負き電線とがほぼ同電位になるよう構成したことを特徴とする地絡保護用放電装置。 Connected between the grounding mat to which the ground wire of equipment installed in an AC feeder substation or AC feeder section is connected, and between this grounding mat and a protective wire, or between the grounding mat and a negative wire A discharger (3), and a surge absorber (2) connected in parallel to the discharger (3) to absorb the surge voltage of the rail and prevent unnecessary discharge of the discharger (3). to (3) configured without providing the bypass switch in parallel, and the discharger discharging capability of (3), current 20,000A above, the discharge time 200msec or more, ground fault trolley line or-out wire A ground fault protection discharging device, wherein the grounding mat and the protective wire or the negative wire are configured to have substantially the same electric potential when a fault occurs. 上記放電器(3)の放電による電流を検出し、放電器の動作回数を計測する計測手段(7)を設けたことを特徴とする請求項1の地絡保護用放電装置。   The ground fault protection discharge device according to claim 1, further comprising a measuring means (7) for detecting a current due to discharge of the discharger (3) and measuring the number of operations of the discharger.
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