JP2005323444A

JP2005323444A - Protection system of dc power feeding circuit network

Info

Publication number: JP2005323444A
Application number: JP2004138762A
Authority: JP
Inventors: Yasuhiro Takabayashi; 泰弘高林; Masahide Koshiba; 昌英小柴
Original assignee: Fuji Electric Systems Co Ltd
Current assignee: Fuji Electric Co Ltd
Priority date: 2004-05-07
Filing date: 2004-05-07
Publication date: 2005-11-17
Anticipated expiration: 2024-05-07
Also published as: JP4120618B2

Abstract

<P>PROBLEM TO BE SOLVED: To protect a DC power feeding circuit network at a short circuit fault time without power interrupting the whole system. <P>SOLUTION: The magnitudes of the overcurrent set values of first to sixteenth super-limiting current circuit breakers 31-46 to perform a breaking operation when an overcurrent flows are set as a forward overcurrent set value and a backward overcurrent set value for every forward current and backward current flowing through the first to the sixteenth super-limiting current circuit breakers 31-46. For example, in a normal operation state, the forward overcurrent set value and the backward overcurrent set value are set so that the first to the sixteenth super-limiting current circuit breakers 31-46 may not operate to be broken by a rated current flowing to the circuit network, a charging current and a regenerative current. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、短絡事故が発生した場合に直流給電回路網に接続された発電機等の電気機器を保護する直流給電回路網の保護システムに関する。 The present invention relates to a protection system for a DC power supply network that protects electrical equipment such as a generator connected to the DC power supply network when a short circuit accident occurs.

直流を電源とする直流給電回路網として、例えば、直流電流を電源とする船舶向け電気システムがある。電気推進船舶等の電気システムとして、一次電源としての蓄電池と、蓄電池を充電する発電機からなる電源装置と、推進に必要な推進電動機と、運航に必要な補機電動機等の機器類とを備えたものがある。
このような電気システムには、短絡事故が発生したときの対策が施されている。従来方式では、回路網に配置した気中遮断器（ＡＣＢ）或いはヒューズ等の保護装置により短絡事故時の保護が行われている（例えば特許文献１参照）。 As a DC power supply network that uses DC as a power source, for example, there is an electrical system for ships that uses DC current as a power source. As an electric system for electric propulsion vessels, etc., it has a storage battery as a primary power source, a power supply device consisting of a generator for charging the storage battery, a propulsion motor necessary for propulsion, and equipment such as an auxiliary motor necessary for operation There is something.
Such an electric system is provided with a countermeasure when a short-circuit accident occurs. In the conventional method, protection in the event of a short circuit is performed by a protective device such as an air circuit breaker (ACB) or a fuse arranged in a circuit network (see, for example, Patent Document 1).

これらの保護装置は、過電流を検出して遮断動作により保護動作をする過電流検出動作型の保護装置である。この保護装置は、当該保護装置を通過する電流値に基づいて遮断動作（開路動作）して、短絡事故時の発電機等の電気機器を保護している。
特開平１０−２６２３３０号公報 These protection devices are overcurrent detection operation type protection devices that detect an overcurrent and perform a protection operation by a cutoff operation. This protection device protects electrical devices such as a generator in the event of a short circuit by performing a shut-off operation (open circuit operation) based on the current value passing through the protection device.
JP 10-262330 A

電気推進船舶等の電気システムでは、電路長が短いため、回路（電路）インピーダンスが微小である。このような電気システムの場合、短絡事故発生時には、短絡発生点に急峻な電流上昇を伴い大きな短絡電流が流れるため、高速・大遮断容量性能をもつ保護装置が必要となる。
また、低インピーダンス電路であるため、保護装置相互間で協調動作して個々が選択的に遮断動作することが困難である。これを図１７乃至図１９を用いて説明する。 In an electric system such as an electric propulsion ship, the circuit (electric circuit) impedance is very small because the electric circuit length is short. In such an electric system, when a short-circuit accident occurs, a large short-circuit current flows at the short-circuit occurrence point with a steep current rise, and thus a protective device having high speed and large breaking capacity performance is required.
Moreover, since it is a low-impedance electric circuit, it is difficult for the protective devices to perform a cooperative operation between the protective devices and selectively perform an individual cutoff operation. This will be described with reference to FIGS.

図１７は、電路系統図（直流給電回路網）の一部を示す。
図１７に示すように、直流電源をなす蓄電池１０１を備える回路（主回路）に、動力系１０２が接続されており、その動力系１０２の前後には動力系保護装置として第１及び第２遮断器（気中遮断器又は超限流遮断器）１１１，１１２が配置されている。また、図１７に示すように、主回路上に主回路保護装置として第３及び第４遮断器（気中遮断器又は超限流遮断器）１１３，１１４が配置されている。これら遮断器１１１〜１１４は、動力系回路の定格電流Ｉ１や主回路の定格電流Ｉ２に応じて選定されている。 FIG. 17 shows a part of a circuit diagram (DC power supply network).
As shown in FIG. 17, a power system 102 is connected to a circuit (main circuit) including a storage battery 101 that forms a DC power source, and first and second cutoffs are provided as power system protection devices before and after the power system 102. The breakers (air circuit breakers or supercurrent breakers) 111 and 112 are arranged. Moreover, as shown in FIG. 17, the 3rd and 4th circuit breakers (air circuit breaker or a supercurrent circuit breaker) 113,114 are arrange | positioned as a main circuit protection apparatus on the main circuit. These circuit breakers 111 to 114 are selected according to the rated current I1 of the power system circuit and the rated current I2 of the main circuit.

図１８は、遮断器の保護動作特性を示す。
一般的には、遮断器の過電流設定値は、定格電流を１００％としたときの電流倍率で決定される。例えば、定格電流を１００％としたとき、過電流検出開始電流が１２５％程度となり、過電流瞬時動作電流が５００％程度となるように設定する。図１８に示す保護動作特性は、動力系回路の定格電流Ｉ１が１ｋＡであり、主回路の定格電流Ｉ２が１０ｋＡである場合の保護動作特性を示す。 FIG. 18 shows the protective operating characteristics of the circuit breaker.
Generally, the overcurrent set value of the circuit breaker is determined by the current magnification when the rated current is 100%. For example, when the rated current is 100%, the overcurrent detection start current is set to about 125%, and the overcurrent instantaneous operating current is set to about 500%. The protection operation characteristics shown in FIG. 18 indicate the protection operation characteristics when the rated current I1 of the power system circuit is 1 kA and the rated current I2 of the main circuit is 10 kA.

ここで、図１７に示すように主回路の一部ｃ１，ｃ２間で短絡が発生した場合を考える。
この場合、図１９に示すように、短絡発生直後に急峻な上昇を示す推定短絡電流が発生する。ここで、推定短絡電流とは、回路電圧を回路抵抗で除した流れるであろう短絡電流の最大値である。この推定短絡電流は、回路インピーダンスが小さいほど大きくなる。また、短絡発生直後の短絡電流の上昇は電流突進率（ｄｉ／ｄｔ）で示され、この電流突進率は、回路インダクタンスＬを回路抵抗Ｒで除した値（Ｌ／Ｒ）で決定される。よって、回路インダクタンスＬが小さければ、短絡電流は急峻な上昇を示すことになる。 Here, consider a case where a short circuit occurs between the parts c1 and c2 of the main circuit as shown in FIG.
In this case, as shown in FIG. 19, an estimated short-circuit current that shows a steep rise immediately after the occurrence of the short-circuit occurs. Here, the estimated short-circuit current is the maximum value of the short-circuit current that will flow by dividing the circuit voltage by the circuit resistance. The estimated short circuit current increases as the circuit impedance decreases. The increase in the short-circuit current immediately after the occurrence of the short-circuit is indicated by a current rush rate (di / dt), and this current rush rate is determined by a value (L / R) obtained by dividing the circuit inductance L by the circuit resistance R. Therefore, if the circuit inductance L is small, the short circuit current shows a sharp rise.

このようなことから、短絡が発生した場合、第１及び第２遮断器１１１，１１２を流れる短絡電流はＩＳ１となり、第３及び第４遮断器１１３，１１４を流れる短絡電流はＩＳ１＋ＩＳ２となるが、それぞれの短絡電流経路の抵抗が小さいほど、その短絡電流ＩＳ１，ＩＳ１＋ＩＳ２は大きくなり、また、インダクタンスが小さければ、短絡電流ＩＳ１，ＩＳ１＋ＩＳ２は短時間で大電流値に到達することになる。 For this reason, when a short circuit occurs, the short circuit current flowing through the first and second circuit breakers 111 and 112 is IS1, and the short circuit current flowing through the third and fourth circuit breakers 113 and 114 is IS1 + IS2. The short circuit current IS1, IS1 + IS2 increases as the resistance of each short circuit path decreases, and if the inductance is small, the short circuit currents IS1, IS1 + IS2 reach a large current value in a short time.

一方、遮断器の保護動作は、短絡発生による過電流を検出してから接点を開いて（接点を開極して）短絡電流（事故電流）を限流遮断するようになっているので、過電流検出から接点開極開始までの時間遅れがほぼ２０〜数十ｍsec.存在する。このようなことから、接点が開いてから短絡電流が限流（減少）するときには、構成回路に配置した各遮断器（保護装置）が既に短絡電流を検出し、遮断動作を開始してしまう。なお、過電流の検出は、変流器（電流検出器）が設定値（しきい値）を超えているか否かで検出している。 On the other hand, the protective action of the circuit breaker is to limit the short-circuit current (accident current) by opening the contact (opening the contact) after detecting the over-current due to the occurrence of short circuit. There is a time delay of approximately 20 to several tens of msec. From current detection to the start of contact opening. For this reason, when the short-circuit current is limited (decreased) after the contact is opened, each circuit breaker (protection device) arranged in the constituent circuit has already detected the short-circuit current and started the breaking operation. The overcurrent is detected based on whether or not the current transformer (current detector) exceeds a set value (threshold value).

よって、本来であれば、各遮断器（保護装置）の設定に従って各遮断器が選択的に保護動作するのが理想であるが、インピーダンスが小さい回路網では、瞬時に大短絡電流に到達してしまい、かつ各遮断器の遮断動作の遅れにより、各遮断器の定格及び設定値にかかわらず、全ての遮断器がほぼ同時に動作してしまう。この結果、前述したように、低インピーダンスの回路では、保護装置（遮断器）相互間で協調動作して個々が選択的に遮断動作することが困難となる。このような事態に至ってしまうと、一ヶ所で発生した短絡事故が回路網に配置した全ての保護装置を動作させてしまう可能性があり、この場合には、システム全体の停電を招いてしまう。 Therefore, it is ideal that each circuit breaker selectively protects according to the setting of each circuit breaker (protection device). However, in a circuit network with low impedance, a large short-circuit current is instantaneously reached. In addition, due to the delay of the circuit breaker operation, all circuit breakers operate almost simultaneously regardless of the rating and set value of each circuit breaker. As a result, as described above, in a low-impedance circuit, it is difficult for the protective devices (breakers) to perform a cooperative operation between the protective devices (breakers) and to selectively perform a blocking operation individually. If such a situation occurs, there is a possibility that a short-circuit accident occurring in one place may cause all the protective devices arranged in the circuit network to operate, and in this case, a power failure of the entire system is caused.

このように、従来方式の過電流検出による短絡保護方式では、高速・大遮断容量の保護装置が必要であり、また、保護装置相互間で協調動作して選択的に遮断保護動作を得ることが極めて困難である。
さらに、近年の電源容量増大に伴い、保護装置の遮断容量向上が望まれる。しかし、保護装置の遮断容量向上が技術的に限界である状況となっている。 As described above, the conventional short-circuit protection method based on overcurrent detection requires a high-speed, large breaking capacity protection device, and can selectively obtain a break protection operation by cooperative operation between the protection devices. It is extremely difficult.
Furthermore, with the recent increase in power supply capacity, it is desired to improve the breaking capacity of the protection device. However, there is a technical limit to improving the breaking capacity of the protection device.

本発明は、前述の問題に鑑みてなされたものであり、高速・大遮断容量性能をもつ保護装置を必要とすることなく、かつシステム全体を停電させることなく、直流給電回路網の短絡事故時の保護を図ることができる直流給電回路網の保護システムの提供を目的とする。 The present invention has been made in view of the above-described problems, and does not require a protective device having high speed and large breaking capacity performance, and without power failure of the entire system, at the time of a short circuit accident of a DC power supply network. It is an object of the present invention to provide a protection system for a DC power supply network that can protect the circuit.

本発明に係る直流給電回路網の保護システムは、複数の電気機器と、当該複数の電気機器に対応させて配置され、かつ過電流を検出して遮断動作する遮断装置とを備えた直流給電回路網を保護する直流給電回路網の保護システムにおいて、前記遮断装置が過電流を検出して遮断動作するための遮断動作電流値の大きさを、前記遮断装置内を流れる正方向電流及び逆方向電流毎に設定することを特徴とする。 A protection system for a DC power supply network according to the present invention includes a plurality of electrical devices, and a DC power supply circuit that is disposed corresponding to the plurality of electrical devices and that includes a shut-off device that detects an overcurrent and performs a shut-off operation. In a protection system for a DC power supply circuit network that protects a network, the magnitude of a cutoff operation current value for the cutoff device to detect a overcurrent and perform a cutoff operation is defined as a forward current and a reverse current flowing in the cutoff device. It is characterized by setting every time.

本発明によれば、遮断装置が過電流を検出して遮断動作するための遮断動作電流値の大きさを、当該遮断装置内を流れる正方向電流及び逆方向電流毎に設定することで、回路網で短絡事故が発生したときの正方向又は逆方向の短絡電流を遮断装置が的確に検出し、遮断装置が速やかに遮断動作することができる。
これにより、短絡事故が発生しても直流給電回路網の全ての遮断装置が遮断動作してしまうことを防止できるので、直流給電回路網の短絡事故時の保護を図りつつ、システム全体が停電してしまうことを防止できる。 According to the present invention, by setting the magnitude of the cutoff operation current value for the cutoff device to detect the overcurrent and perform the cutoff operation for each of the forward current and the reverse current flowing through the cutoff device, The breaking device can accurately detect the short-circuit current in the normal direction or the reverse direction when a short-circuit accident occurs in the net, and the breaking device can quickly cut-off.
As a result, even if a short-circuit accident occurs, it is possible to prevent all the interruption devices of the DC power supply network from shutting down, so that the entire system can be cut off while protecting the DC power supply network in the event of a short-circuit accident. Can be prevented.

本発明を実施するための最良の形態（以下、実施形態という。）を図面を参照しながら詳細に説明する。
（１）構成の説明
図１は本発明が適用される直流給電回路網の電路系統図を示す。図２は図１の電路系統図に対応するインピーダンスマップを示す。 The best mode for carrying out the present invention (hereinafter referred to as an embodiment) will be described in detail with reference to the drawings.
(1) Description of Configuration FIG. 1 shows a circuit diagram of a DC power supply network to which the present invention is applied. FIG. 2 shows an impedance map corresponding to the circuit diagram of FIG.

図１に示すように、直流電源をなす第１及び第２（１号及び２号）蓄電池１，２（Ｂ１，Ｂ２）を備える回路（主回路）に、第１及び第２（１号系及び２号系）動力３，４（ＭＡ１，ＭＡ２）、第１及び第２（１号及び２号）発電機５，６（Ｇ１，Ｇ２）、並びに電動機７（Ｍ）が接続されている。例えば、直流給電回路網が船舶用のものであれば、電動機７は推進電動機になる。 As shown in FIG. 1, a circuit (main circuit) including first and second (No. 1 and No. 2) storage batteries 1 and 2 (B1 and B2) forming a DC power source is connected to the first and second (No. 1 systems). And No. 2 system) power 3, 4 (MA1, MA2), first and second (No. 1 and 2) generators 5, 6 (G1, G2), and electric motor 7 (M) are connected. For example, if the DC power supply network is for ships, the motor 7 is a propulsion motor.

また、この回路網において、第１蓄電池１、第１動力３及び第１発電機５により１号系の回路網を構成し、第２蓄電池２、第２動力４及び第２発電機６により２号系の回路網を構成している。
また、この回路網では、第１及び第２接続点ａ１，ａ２により第１動力３が接続されており、第３及び第４接続点ａ３，ａ４により第２動力４が接続されており、第５及び第６接続点ａ５，ａ６により第１発電機５が接続されており、第７及び第８接続点ａ７，ａ８により第２発電機６が接続されており、第９及び第１０接続点ａ９，ａ１０により電動機７が接続されている。これにより直流給電回路網が構成されている。 In this circuit network, the first storage battery 1, the first power 3 and the first generator 5 constitute a No. 1 system network, and the second storage battery 2, the second power 4 and the second generator 6 It constitutes a circuit network.
In this circuit network, the first power 3 is connected by the first and second connection points a1 and a2, the second power 4 is connected by the third and fourth connection points a3 and a4, The first generator 5 is connected by the fifth and sixth connection points a5 and a6, the second generator 6 is connected by the seventh and eighth connection points a7 and a8, and the ninth and tenth connection points. The electric motor 7 is connected by a9 and a10. Thus, a DC power supply network is configured.

また、これらの各構成機器要素１〜７の電力規模の関係は一般的には次のような関係になる。
（Ｂ１又はＢ２）＞Ｍ＞（Ｇ１又はＧ２）＞（ＭＡ１又はＭＡ２）
これにより、各構成機器要素１〜７の電流規模の関係は次のような関係になる。
（Ｂ１又はＢ２）＞Ｍ＞（Ｇ１又はＧ２）＞（ＭＡ１又はＭＡ２）
そして、この回路網では、第１及び第２動力３，４並びに第１及び第２発電機５，６それぞれの前後に、第１乃至第８遮断器（気中遮断器）１１〜１８及び第１乃至第８超限流遮断器３１〜３８が設置されている。また、前記第１及び第２蓄電池１，２を備える回路上、第１接続点ａ１と第５接続点ａ５との間に、第９遮断器１９及び第９超限流遮断器３９を備え、第２接続点ａ２と第６接続点ａ６との間に、第１０遮断器２０及び第１０超限流遮断器４０を備え、第３接続点ａ３と第７接続点ａ７との間に、第１１遮断器２１及び第１１超限流遮断器４１を備え、第４接続点ａ４と第８接続点ａ８との間に、第１２遮断器２２及び第１２超限流遮断器４２を備え、第５接続点ａ５と第９接続点ａ９との間に、第１３超限流遮断器４３を備え、第６接続点ａ６と第１０接続点ａ１０との間に、第１４超限流遮断器４４を備え、第７接続点ａ７と第９接続点ａ９との間に、第１５超限流遮断器４５を備え、第８接続点ａ８と第１０接続点ａ１０との間に、第１６超限流遮断器４６を備えている。 Moreover, the relationship between the power scales of these component device elements 1 to 7 is generally as follows.
(B1 or B2)>M> (G1 or G2)> (MA1 or MA2)
Thereby, the relationship of the electric current scale of each component apparatus element 1-7 becomes the following relationships.
(B1 or B2)>M> (G1 or G2)> (MA1 or MA2)
In this circuit network, the first to eighth circuit breakers (air circuit breakers) 11 to 18 and the first and second powers 3 and 4 and the first and second power generators 5 and 6 are respectively connected to the front and rear. 1st-8th supercurrent limit circuit breakers 31-38 are installed. In addition, on the circuit including the first and second storage batteries 1, 2 and 9 between the first connection point a1 and the fifth connection point a5, a ninth circuit breaker 19 and a ninth ultracurrent limiting circuit breaker 39 are provided. Between the second connection point a2 and the sixth connection point a6, the tenth circuit breaker 20 and the tenth supercurrent limiter 40 are provided, and between the third connection point a3 and the seventh connection point a7, 11 circuit breaker 21 and 11th supercurrent limit circuit breaker 41, 12th circuit breaker 22 and 12th supercurrent limit circuit breaker 42 between 4th connection point a4 and 8th connection point a8, A thirteenth supercurrent breaker 43 is provided between the fifth connection point a5 and the ninth connection point a9, and a fourteenth supercurrent limiter 44 is provided between the sixth connection point a6 and the tenth connection point a10. Including a fifteenth supercurrent breaker 45 between the seventh connection point a7 and the ninth connection point a9, and between the eighth connection point a8 and the tenth connection point a10. 6 and a super limiting breaker 46.

ここで、第１乃至第８遮断器１１〜１８は、各回路の定格電流に応じて選定されている。また、第１乃至第１６超限流遮断器３１〜４６はそれぞれ、当該第１乃至第１６超限流遮断器３１〜４６を通る電流を検出する変流器（電流検出器）３１ａ〜４６ａと、変流器３１ａ〜４６ａの電流検出結果に基づいて動作する限流ヒューズ３１ｃ〜４６ｃとを備えている。具体的には、限流ヒューズ３１ｃ〜４６ｃは、変流器３１ａ〜４６ａに設定されている過電流設定値（過電流保護設定値）に達したときに動作し、この動作が第１乃至第１６超限流遮断器３１〜４６の遮断動作となる。 Here, the first to eighth circuit breakers 11 to 18 are selected according to the rated current of each circuit. Further, the first to sixteenth supercurrent breakers 31 to 46 are current transformers (current detectors) 31a to 46a that detect currents passing through the first to sixteenth supercurrent breakers 31 to 46, respectively. Current limiting fuses 31c to 46c that operate based on the current detection results of the current transformers 31a to 46a. Specifically, the current limiting fuses 31c to 46c operate when the overcurrent set value (overcurrent protection set value) set in the current transformers 31a to 46a is reached. It becomes the interruption | blocking operation | movement of 16 supercurrent limit circuit breakers 31-46.

このように回路網に第１乃至第８遮断器１１〜１８及び第１乃至第１６超限流遮断器３１〜４６を配置することで、回路網の任意の点で短絡事故があった場合に各回路及び構成機器要素１〜７の保護を行っている。
なお、遮断器１１〜１８や超限流遮断器３１〜４６を備える一方で、個々の構成機器要素１〜７は、個別に保護装置を備えており、その保護装置によって独自に保護されている。 Thus, by arranging the first to eighth circuit breakers 11 to 18 and the first to sixteenth current limiting circuit breakers 31 to 46 in the circuit network, when there is a short circuit accident at an arbitrary point of the circuit network Each circuit and component device elements 1 to 7 are protected.
In addition, while providing the circuit breakers 11-18 and the supercurrent limit circuit breakers 31-46, each component apparatus element 1-7 is equipped with the protective device separately, and is protected uniquely by the protective device. .

（２）過電流設定値の説明
次に、第１乃至第１６超限流遮断器３１〜４６（具体的には変流器３１ａ〜４６ａ）の過電流設定値を説明する。
第１乃至第１６超限流遮断器３１〜４６に設定される過電流設定値は、第１乃至第１６超限流遮断器３１〜４６に流れる正方向電流に対応する正方向過電流設定値と、第１乃至第１６超限流遮断器３１〜４６に流れる逆方向電流に対応する逆方向過電流設定値とがあり、それら正方向過電流設定値及び逆方向過電流設定値の大きさが各回路の定格電流等の条件に応じて個別に設定されている。下記表１及び図３は、各回路の定格電流と、第１乃至第１６超限流遮断器３１〜４６に設定される正方向過電流設定値（正方向設定値）及び逆方向過電流設定値（逆方向設定値）との関係を示す。 (2) Description of overcurrent set value Next, the overcurrent set value of the 1st thru | or 16th supercurrent limit circuit breakers 31-46 (specifically current transformer 31a-46a) is demonstrated.
The overcurrent set values set in the first to sixteenth supercurrent limit circuit breakers 31 to 46 are positive direction overcurrent set values corresponding to the positive direction currents flowing in the first to sixteenth supercurrent limit circuit breakers 31 to 46. And reverse overcurrent setting values corresponding to the reverse currents flowing through the first to sixteenth supercurrent breakers 31 to 46, and the magnitudes of the positive overcurrent setting value and the reverse overcurrent setting value. Are individually set according to conditions such as the rated current of each circuit. Table 1 and FIG. 3 below show the rated current of each circuit, the positive overcurrent setting value (forward setting value) and the reverse overcurrent setting set in the first to sixteenth supercurrent limiters 31 to 46. It shows the relationship with the value (reverse direction setting value).

なお、ここでこの回路網に流れる電流は次のようになる。
図１に示す正方向電流＋Ｉｂ１，＋Ｉｂ２は、蓄電池１，２の放電電流であり、正方向電流＋Ｉｇ１，＋Ｉｇ２は、発電機５，６の出力電流であり、正方向電流値Ｉｍは、電動機７の動力用電流であり、正方向電流＋Ｉｍａ１，＋Ｉｍａ２は、動力３，４の動力用電流である。また、逆方向電流−Ｉｂ１，−Ｉｂ２，−Ｉｇ１，−Ｉｇ２，−Ｉｍａ１，−Ｉｍａ２は、正方向電流＋Ｉｂ１，＋Ｉｂ２，＋Ｉｇ１，＋Ｉｇ２，＋Ｉｍａ１，＋Ｉｍａ２とは逆方向に流れる電流になる。例えば、逆方向電流−Ｉｂ１，−Ｉｂ２は、蓄電池１，２の充電電流又は回生電流である。ここで、充電電流は、発電機５，６により蓄電池１，２を充電する場合の電流であり、回生電流は、電動機７が減速やブレーキ動作時に発生して、蓄電池１，２に流れる電流である。 Here, the current flowing in this network is as follows.
The positive direction currents + Ib1 and + Ib2 shown in FIG. 1 are the discharge currents of the storage batteries 1 and 2, the positive direction currents + Ig1 and + Ig2 are the output currents of the generators 5 and 6, and the positive direction current value Im is the electric motor 7 The positive currents + Ima1 and + Ima2 are power currents for the powers 3 and 4. Further, the reverse currents -Ib1, -Ib2, -Ig1, -Ig2, -Ima1, -Ima2 are currents flowing in the reverse direction to the positive currents + Ib1, + Ib2, + Ig1, + Ig2, + Ima1, + Ima2. For example, the reverse currents -Ib1 and -Ib2 are charging currents or regenerative currents of the storage batteries 1 and 2. Here, the charging current is a current when the storage batteries 1 and 2 are charged by the generators 5 and 6, and the regenerative current is a current that flows through the storage batteries 1 and 2 when the electric motor 7 is decelerated or braked. is there.

また、これら正方向電流＋Ｉｍ，＋Ｉ１ａΣ，＋Ｉ２ａΣ，＋Ｉ１ｂΣ，＋Ｉ２ｂΣ，＋Ｉ１ｃΣ，＋Ｉ２ｃΣは、短絡事故が発生していない正常運転状態に回路網に流れる電流であり、正常動作運転状態において、これら正方向電流の間には、次のような関係が成り立つ。
＋Ｉ１ａΣ＝＋Ｉｂ１−（＋Ｉｍａ１）＝＋Ｉ１ｂΣ
＋Ｉ１ｃΣ＝＋Ｉ１ｂΣ＋（＋Ｉｇ１）
＋Ｉ２ａΣ＝＋Ｉｂ２−（＋Ｉｍａ２）＝＋Ｉ２ｂΣ
＋Ｉ２ｃΣ＝＋Ｉ２ｂΣ＋（＋Ｉｇ２）
＋Ｉｍ＝＋Ｉ１ｃΣ＋Ｉ２ｃΣ
また、逆方向電流−Ｉｍ，−Ｉ１ａΣ，−Ｉ２ａΣ，−Ｉ１ｂΣ，−Ｉ２ｂΣ，−Ｉ１ｃΣ，−Ｉ２ｃΣは、前記正方向電流＋Ｉｍ，＋Ｉ１ａΣ，＋Ｉ２ａΣ，＋Ｉ１ｂΣ，＋Ｉ２ｂΣ，＋Ｉ１ｃΣ，＋Ｉ２ｃΣとは逆方向に流れる電流になる。例えば、逆方向電流−Ｉｍ，−Ｉ１ｃΣ，−Ｉ２ｃΣは、蓄電池１，２への回生電流であり、逆方向電流−Ｉ１ａΣ（−Ｉ１ｂΣ），−Ｉ２ａΣ（−Ｉ２ｂΣ）は、充電電流や回生電流になる。 The positive currents + Im, + I1aΣ, + I2aΣ, + I1bΣ, + I2bΣ, + I1cΣ, and + I2cΣ are currents that flow through the circuit network in a normal operation state in which no short-circuit accident has occurred. The following relationship holds between:
+ I1aΣ = + Ib1-(+ Ima1) = + I1bΣ
+ I1cΣ = + I1bΣ + (+ Ig1)
+ I2aΣ = + Ib2 − (+ Ima2) = + I2bΣ
+ I2cΣ = + I2bΣ + (+ Ig2)
+ Im = + I1cΣ + I2cΣ
Further, the reverse currents -Im, -I1aΣ, -I2aΣ, -I1bΣ, -I2bΣ, -I1cΣ, -I2cΣ flow in the opposite direction to the positive currents + Im, + I1aΣ, + I2aΣ, + I1bΣ, + I2bΣ, + I1cΣ, + I2cΣ. Become current. For example, the reverse currents -Im, -I1cΣ and -I2cΣ are regenerative currents to the storage batteries 1 and 2, and the reverse currents -I1aΣ (-I1bΣ) and -I2aΣ (-I2bΣ) are used as charging currents and regenerative currents. Become.

以上のような電流が回路網に流れており、この回路網に設置されている第１乃至第１６超限流遮断器３１〜４６の正方向過電流設定値及び逆方向過電流設定値は次のように設定されている（表１、図３参照）。
（２−１）第９乃至第１２超限流遮断器３９〜４２の過電流設定値
第９乃至第１２超限流遮断器３９〜４２は、蓄電池１，２から最大負荷電力の電動機７へ電力を供給する推進母線に設置した短絡保護用のものである。そして、この第９乃至第１２超限流遮断器３９〜４２が設置されている回路の定格電流（Ｉ１ａ，Ｉ２ａ）を＋１２とすれば、第９乃至第１２超限流遮断器３９〜４２の正方向過電流設定値Ｉ１ａｏｃ，Ｉ２ａｏｃを＋１５（＝＋１２×１．２）程度に設定し、第９乃至第１２超限流遮断器３９〜４２の逆方向過電流設定値Ｉ１ａＲ，Ｉ２ａＲを−６（＝＋１２×（−０．５））程度に設定する。 The current as described above is flowing in the circuit network, and the forward overcurrent set value and the reverse overcurrent set value of the first to sixteenth ultracurrent breakers 31 to 46 installed in the circuit network are as follows. (See Table 1 and FIG. 3).
(2-1) Overcurrent setting values of ninth to twelfth supercurrent breakers 39 to 42 The ninth to twelfth supercurrent breakers 39 to 42 are connected from the storage batteries 1 and 2 to the motor 7 having the maximum load power. It is for short circuit protection installed in the propulsion bus that supplies power. If the rated current (I1a, I2a) of the circuit in which the ninth to twelfth supercurrent breakers 39 to 42 are installed is +12, the ninth to twelfth supercurrent breakers 39 to 42 The forward overcurrent set values I1aoc and I2aoc are set to about +15 (= + 12 × 1.2), and the reverse overcurrent set values I1aR and I2aR of the ninth to twelfth supercurrent breakers 39 to 42 are set to −6. Set to about (= + 12 × (−0.5)).

また、前述したように発電機５，６により蓄電池１，２に充電電流が流れ、又は電動機７が減速やブレーキ動作時に蓄電池１，２に回生電流が流れており、これら電流が逆方向電流−Ｉ１ａΣ，−Ｉ２ａΣとして第９乃至第１２超限流遮断器３９〜４２を流れることから、逆方向過電流設定値Ｉ１ａＲ，Ｉ２ａＲは、充電電流及び回生電流（逆方向電流−Ｉ１ａΣ，−Ｉ２ａΣ）によって当該第９乃至第１２超限流遮断器３９〜４２が遮断動作しないよう、これらの電流値よりも高い値に設定されている。 Further, as described above, the charging current flows to the storage batteries 1 and 2 by the generators 5 and 6, or the regenerative current flows to the storage batteries 1 and 2 when the electric motor 7 decelerates and brakes, and these currents are reverse current − The reverse overcurrent setting values I1aR and I2aR are caused by the charging current and the regenerative current (reverse currents −I1aΣ and −I2aΣ) since they flow through the ninth to twelfth supercurrent limiters 39 to 42 as I1aΣ and −I2aΣ. The current value is set to a value higher than these current values so that the ninth to twelfth supercurrent breakers 39 to 42 do not perform the breaking operation.

（２−２）第１３乃至第１６超限流遮断器４３〜４６の過電流設定値
第１３乃至第１６超限流遮断器４３〜４６は、電動機７への電力供給回路の短絡保護用のものである。そして、この第１３乃至第１６超限流遮断器４３〜４６が設定されている回路の定格電流（Ｉ１ｃ，Ｉ２ｃ）を＋９とすれば、第１３乃至第１６超限流遮断器４３〜４６の正方向過電流設定値Ｉ１ｃｏｃ，Ｉ２ｃｏｃを＋１１（＝＋９×１．２）程度に設定し、第１３乃至第１６超限流遮断器４３〜４６の逆方向過電流設定値Ｉ１ｃＲ，Ｉ２ｃＲを前記第９乃至第１２超限流遮断器３９〜４２の逆方向過電流設定値Ｉ１ａＲ，Ｉ２ａＲと同様に、−６程度に設定する。 (2-2) Overcurrent setting values of thirteenth to sixteenth supercurrent breakers 43 to 46 The thirteenth to sixteenth supercurrent breakers 43 to 46 are for short-circuit protection of the power supply circuit to the motor 7. Is. If the rated current (I1c, I2c) of the circuit in which the thirteenth to sixteenth supercurrent breakers 43 to 46 are set is +9, the thirteenth to sixteenth supercurrent breakers 43 to 46 The forward overcurrent set values I1coc and I2coc are set to about +11 (= + 9 × 1.2), and the reverse overcurrent set values I1cR and I2cR of the thirteenth to sixteenth supercurrent limiters 43 to 46 are Similar to the reverse overcurrent set values I1aR and I2aR of the ninth to twelfth supercurrent limiter breakers 39 to 42, it is set to about -6.

この場合、当然、電動機７からの回生電流は逆方向過電流設定値Ｉ１ｃＲ，Ｉ２ｃＲである約−６を越えない範囲で制御するようにして、電動機７が回生動作した時に第１３乃至第１６超限流遮断器４３〜４６が誤動作しないようにする。
（２−３）第５乃至第８超限流遮断器３５〜３８の過電流設定値
第５乃至第８超限流遮断器３５〜３８は、発電機５，６用の回路の短絡保護用のものである。そして、この第５乃至第８超限流遮断器３５〜３８が設定されている回路の定格電流（Ｉｇ１，Ｉｇ２）を＋４とすれば、第５乃至第８超限流遮断器３５〜３８の正方向過電流設定値Ｉｇ１ｏｃ，Ｉｇ２ｏｃを＋６（＝＋４×１．５）程度に設定し、第５乃至第８超限流遮断器３５〜３８の逆方向過電流設定値Ｉｇ１Ｒ，Ｉｇ２Ｒを−０．４（＝＋４×（−０．１））程度に設定する。 In this case, naturally, the regenerative current from the electric motor 7 is controlled within a range not exceeding about −6 which is the reverse overcurrent set values I1cR and I2cR, and when the electric motor 7 performs the regenerative operation, The current limit circuit breakers 43 to 46 are prevented from malfunctioning.
(2-3) Overcurrent set values of the fifth to eighth supercurrent breakers 35 to 38 The fifth to eighth supercurrent breakers 35 to 38 are for short circuit protection of the circuits for the generators 5 and 6. belongs to. If the rated current (Ig1, Ig2) of the circuit in which the fifth to eighth supercurrent breakers 35 to 38 are set is +4, the fifth to eighth supercurrent breakers 35 to 38 The forward overcurrent set values Ig1oc and Ig2oc are set to about +6 (= + 4 × 1.5), and the reverse overcurrent set values Ig1R and Ig2R of the fifth to eighth supercurrent breakers 35 to 38 are set to −0. .4 (= + 4 × (−0.1)) or so.

ここで、発電機５，６は、蓄電池１，２への充電の他、電動機７及び動力（補機動力）３，４にも電力を供給するので、通常運転状態では逆方向に電流が流れることはない。よって、逆方向電流が発生した状態とは異常状態である。よって、僅かな逆方向電流が発生しても、これを検出し、速やかに回路を遮断するのが望ましい。このようなことから、第５乃至第８超限流遮断器３５〜３８の逆方向過電流設定値Ｉｇ１Ｒ，Ｉｇ２Ｒを−０．４程度の小さい値に設定している。 Here, the generators 5 and 6 supply power to the electric motor 7 and power (auxiliary power) 3 and 4 in addition to charging the storage batteries 1 and 2, so that current flows in the reverse direction in the normal operation state. There is nothing. Therefore, the state where the reverse current is generated is an abnormal state. Therefore, it is desirable that even if a slight reverse current is generated, this is detected and the circuit is promptly shut off. For this reason, the reverse overcurrent set values Ig1R and Ig2R of the fifth to eighth supercurrent breakers 35 to 38 are set to a small value of about −0.4.

（２−４）第１乃至第４超限流遮断器３１〜３４の過電流設定値
第１乃至第４超限流遮断器３１〜３４は、動力（補機動力）３，４用の回路の短絡保護用のものである。そして、この第１乃至第４超限流遮断器３１〜３４が設定されている回路の定格電流（Ｉｍａ１，Ｉｍａ２）を＋１．５とすれば、第１乃至第４超限流遮断器３１〜３４の正方向過電流設定値Ｉｍａ１ｏｃ，Ｉｍａ２ｏｃを＋２．２（＝＋１．５×１．５）程度に設定し、第１乃至第４超限流遮断器３１〜３４の逆方向過電流設定値Ｉｍａ１Ｒ，Ｉｍａ２Ｒを当該正方向過電流設定値Ｉｍａ１ｏｃ，Ｉｍａ２ｏｃと絶対値で同値の−２．２程度に設定する。 (2-4) Overcurrent set values of the first to fourth ultracurrent breakers 31 to 34 The first to fourth ultracurrent breakers 31 to 34 are circuits for power (auxiliary power) 3 and 4. For short circuit protection. If the rated current (Ima1, Ima2) of the circuit in which the first to fourth supercurrent breakers 31 to 34 are set is +1.5, the first to fourth supercurrent breakers 31 to 31 are set. 34 forward overcurrent set values Ima1oc and Ima2oc are set to about +2.2 (= + 1.5 × 1.5), and the reverse overcurrent set values of the first to fourth ultracurrent breakers 31 to 34 are set. Ima1R and Ima2R are set to about −2.2, which is the same absolute value as the positive overcurrent set values Ima1oc and Ima2oc.

ここで、動力（補機動力）３，４が電力の供給を受けて動く機器であることから、その回路には通常運転状態では逆方向に電流が流れることはなく、動力（補機動力）３，４以外の回路における短絡事故発生時にのみ逆方向の電流が流れることになる。このようなことから、動力（補機動力）３，４以外の回路で発生した短絡事故によって動力（補機動力）３，４の回路の第１乃至第４超限流遮断器３１〜３４が遮断動作することがないように、第１乃至第４超限流遮断器３１〜３４が逆方向電流では検出動作しないようにしてもよく、これにより、例えば、電気推進船舶の電気システムにおいて、船舶の運転のために必要な動力（補機動力）電源をより確実に最後まで確保することができるようになる。 Here, since the power (auxiliary power) 3 and 4 is a device that moves upon receiving power supply, current does not flow in the reverse direction in the normal operation state, and the power (auxiliary power) A current in the reverse direction flows only when a short circuit accident occurs in circuits other than 3 and 4. For this reason, the first to fourth supercurrent-limiting circuit breakers 31 to 34 in the power (auxiliary power) 3 and 4 circuits are caused by a short circuit accident occurring in a circuit other than the power (auxiliary power) 3 and 4. The first to fourth ultracurrent limiters 31 to 34 may be prevented from detecting operation with a reverse current so that the circuit breaker does not operate. For example, in an electric system of an electric propulsion ship, Thus, the power (auxiliary power) power source necessary for the operation can be more reliably secured to the end.

（３）超限流遮断器の遮断動作の説明
次に短絡事故が発生した時の第１乃至第１６超限流遮断器３１〜４６の遮断動作を説明する。
先ず、図４は、正常運転状態での電流の流れ方向（正方向の流れ方向）を示す。この図４中にて、実線として示す電流の矢印の方向（正方向の流れ方向）は正常運転状態での電流の流れ方向となる。また、点線として示す電流の矢印の方向（逆方向の流れ方向）は充電や回生時の電流の流れ方向となる。 (3) Description of breaking operation of supercurrent breaker Next, the breaking operation of the first to sixteenth supercurrent breakers 31 to 46 when a short circuit accident occurs will be described.
First, FIG. 4 shows a current flow direction (a positive flow direction) in a normal operation state. In FIG. 4, the direction of the current arrow indicated by the solid line (positive flow direction) is the current flow direction in the normal operation state. The direction of the current arrow indicated by the dotted line (the reverse flow direction) is the current flow direction during charging or regeneration.

ここでは、図１、図２及び図４に示す点１ＢＰと点１ＢＮとの間、点ＣＰと点ＣＮとの間、点１ＡＰと点１ＡＮとの間又は点１ＧＰと点１ＧＮとの間で短絡事故が発生した場合を説明する。
ここで、点１ＢＰは、第９超限流遮断器３９と第５接続点ａ５との間の点であり、点１ＢＮは、第１０超限流遮断器４０と第６接続点ａ６との間の点であり、点ＣＰは第９接続点ａ９であり、点ＣＮは第１０接続点ａ１０であり、点１ＡＰは、第１超限流遮断器３１と第１動力３との間にある点であり、点１ＡＮは、第２超限流遮断器３２と第１動力３との間にある点であり、点１ＧＰは、第５超限流遮断器３５と第１発電機５との間にあり、点１ＧＮは、第６超限流遮断器３６と第１発電機５との間にある点である。以下の説明では、これら点１ＢＰ，１ＢＮ，ＣＰ，ＣＮ，１ＡＰ，１ＡＮ，１ＧＰ，１ＧＮを短絡点１ＢＰ，１ＢＮ，ＣＰ，ＣＮ，１ＡＰ，１ＡＮ，１ＧＰ，１ＧＮと言うことにする。 Here, a short circuit is made between point 1BP and point 1BN, between point CP and point CN, between point 1AP and point 1AN, or between point 1GP and point 1GN as shown in FIGS. Explain when an accident occurs.
Here, the point 1BP is a point between the ninth supercurrent breaker 39 and the fifth connection point a5, and the point 1BN is between the tenth supercurrent breaker 40 and the sixth connection point a6. The point CP is the ninth connection point a9, the point CN is the tenth connection point a10, and the point 1AP is between the first supercurrent limiter 31 and the first power 3 The point 1AN is a point between the second supercurrent breaker 32 and the first power 3, and the point 1GP is between the fifth supercurrent breaker 35 and the first generator 5. The point 1GN is a point between the sixth supercurrent limiter 36 and the first generator 5. In the following description, these points 1BP, 1BN, CP, CN, 1AP, 1AN, 1GP, and 1GN are referred to as short-circuit points 1BP, 1BN, CP, CN, 1AP, 1AN, 1GP, and 1GN.

（３−１）短絡点１ＢＰと短絡点１ＢＮとの間で短絡事故が発生した場合（図５、図６、図７）
図５は、短絡点１ＢＰと短絡点１ＢＮとの間で短絡事故発生時の短絡電流の流れを電路系統図をベースに記載したものを示し、図６は、その電路系統図に対応するインピーダンスマップを示す。また、図７は、短絡点１ＢＰと短絡点１ＢＮとの間で短絡事故発生時の超限流遮断器での検出電流及び保護動作を示す。 (3-1) When a short circuit accident occurs between the short circuit point 1BP and the short circuit point 1BN (FIGS. 5, 6, and 7)
FIG. 5 shows the flow of a short-circuit current when a short-circuit accident occurs between the short-circuit point 1BP and the short-circuit point 1BN based on the electric circuit diagram, and FIG. 6 shows an impedance map corresponding to the electric circuit diagram. Indicates. Moreover, FIG. 7 shows the detection current and the protective operation in the supercurrent breaker when a short circuit accident occurs between the short circuit point 1BP and the short circuit point 1BN.

図５及び図６に示すように、短絡点１ＢＰと短絡点１ＢＮとの間で短絡事故が発生すると、各々の回路網からは当該回路網の回路定数によって決まる短絡電流がそれぞれ流出し、短絡点１ＢＰと短絡点１ＢＮとの間に短絡電流（合計電流）ＩΣが流れる。ここで、短絡電流ＩΣは下記式のようになる。
ＩΣ＝Ｉ１ａΣ＋Ｉ１ｂΣ
Ｉ１ａΣ＝Ｉｂ１＋Ｉｍａ１
Ｉ１ｂΣ＝Ｉｇ１＋Ｉ１ｃΣ
Ｉ１ｃΣ＝Ｉｍ＋Ｉ２ｃΣ
Ｉ２ｃΣ＝Ｉｇ２＋Ｉ２ｂΣ
Ｉ２ｂΣ＝Ｉｂ２＋Ｉｍａ２（＝Ｉ２ａΣ）
ここで、電流Ｉｂ１，Ｉｂ２は、正方向電流であり、それぞれ第１及び第２蓄電池１，２から短絡点１ＢＰ，１ＢＮに向かう短絡電流となり、電流Ｉｍａ１，Ｉｍａ２は、逆方向電流であり、それぞれ第１及び第２動力３，４の電動機負荷等に起因して、短絡点１ＢＰ，１ＢＮに向かう短絡電流となり、電流Ｉｇ１，Ｉｇ２は、正方向電流であり、それぞれ第１及び第２発電機５，６から短絡点１ＢＰ，１ＢＮに向かう短絡電流であり、電流Ｉｍは、逆方向電流であり、電動機７から短絡点１ＢＰ，１ＢＮに向かう短絡電流となる。例えば、短絡電流Ｉ１ａΣは、第９遮断器１９及び第９超限流遮断器３９を通って短絡点１ＢＰ，１ＢＮに流れる電流であり、或いは短絡点１ＢＰ，１ＢＮから第１０遮断器２０及び第１０超限流遮断器４０に流れ込む電流である。 As shown in FIGS. 5 and 6, when a short circuit accident occurs between the short circuit point 1BP and the short circuit point 1BN, a short circuit current determined by the circuit constant of the circuit network flows out from each circuit network. A short-circuit current (total current) IΣ flows between 1BP and the short-circuit point 1BN. Here, the short-circuit current IΣ is expressed by the following equation.
IΣ = I1aΣ + I1bΣ
I1aΣ = Ib1 + Ima1
I1bΣ = Ig1 + I1cΣ
I1cΣ = Im + I2cΣ
I2cΣ = Ig2 + I2bΣ
I2bΣ = Ib2 + Ima2 (= I2aΣ)
Here, the currents Ib1 and Ib2 are forward currents, which are short-circuit currents from the first and second storage batteries 1 and 2 to the short-circuit points 1BP and 1BN, respectively. The currents Ima1 and Ima2 are reverse-currents, respectively. Due to the motor loads and the like of the first and second powers 3 and 4, short-circuit currents toward the short-circuit points 1BP and 1BN are generated, and the currents Ig1 and Ig2 are forward currents, respectively. , 6 is a short-circuit current toward the short-circuit points 1BP, 1BN, and the current Im is a reverse current, which is a short-circuit current from the motor 7 toward the short-circuit points 1BP, 1BN. For example, the short-circuit current I1aΣ is a current that flows to the short-circuit points 1BP and 1BN through the ninth circuit breaker 19 and the ninth supercurrent limiter 39, or from the short-circuit points 1BP and 1BN to the tenth circuit breaker 20 and the tenth circuit. This is the current that flows into the supercurrent breaker 40.

このとき、短絡点１ＢＰ，１ＢＮの近傍に配置されている第９及び第１０超限流遮断器３９，４０並びに第１３及び第１４超限流遮断器４３，４４に関して、第９及び第１０超限流遮断器３９，４０には正方向短絡電流Ｉ１ａΣ（正Ｉ１ａΣ又は＋Ｉ１ａΣ）が流れ、第１３及び第１４超限流遮断器４３，４４には逆方向短絡電流Ｉ１ｃΣ（逆Ｉ１ｃΣ又は−Ｉ１ｃΣ）が流れる。また、このとき、第１及び第２超限流遮断器３１，３２に逆方向短絡電流Ｉｍａ１（逆Ｉｍａ１又は−Ｉｍａ１）が流れ、第３及び第４超限流遮断器３３，３４に逆方向短絡電流Ｉｍａ２（逆Ｉｍａ２又は−Ｉｍａ２）が流れる。 At this time, with respect to the ninth and tenth supercurrent limiters 39, 40 and the thirteenth and fourteenth supercurrent limiters 43, 44 arranged in the vicinity of the short-circuit points 1BP, 1BN, A forward-direction short-circuit current I1aΣ (positive I1aΣ or + I1aΣ) flows through the current-limiting circuit breakers 39 and 40, and a reverse-direction short-circuit current I1cΣ (reverse I1cΣ or −I1cΣ) flows through the thirteenth and fourteenth supercurrent-limiting circuit breakers 43 and 44. Flows. At this time, the reverse short-circuit current Ima1 (reverse Ima1 or -Ima1) flows through the first and second supercurrent breakers 31, 32, and the reverse direction flows through the third and fourth supercurrent breakers 33, 34. A short-circuit current Ima2 (reverse Ima2 or -Ima2) flows.

これら各短絡電流の短絡事故発生時からの変化は図７に示すようになる。各短絡電流の大きさと電流上昇は回路インピーダンスに支配される。すなわち例えば、短絡点１ＢＰ，１ＢＮに流れる短絡電流ＩΣは、各回路から流入する短絡電流の総和であるが、その一方で、短絡点１ＢＰ，１ＢＮが第１蓄電池１に近いためインピーダンスが小さくなることから、短絡電流ＩΣは、高電流突進率短絡電流、過大短絡電流となる。 Changes in these short-circuit currents from the occurrence of a short-circuit accident are as shown in FIG. The magnitude of each short circuit current and the current rise are governed by the circuit impedance. That is, for example, the short-circuit current IΣ flowing through the short-circuit points 1BP and 1BN is the sum of the short-circuit currents flowing from the respective circuits, but on the other hand, the short-circuit points 1BP and 1BN are close to the first storage battery 1 so that the impedance is reduced. Therefore, the short circuit current IΣ becomes a high current rush rate short circuit current and an excessive short circuit current.

このように各短絡電流が変化するときに、第９及び第１０超限流遮断器３９，４０に流れる正方向短絡電流Ｉ１ａΣ（正Ｉ１ａΣ又は＋Ｉ１ａΣ）は、短絡発生から時間ｔ２後にその第９及び第１０超限流遮断器３９，４０の正方向過電流設定値Ｉ１ａｏｃである＋１５になり（同図の動作点ｆ１に達し）、この時に第９及び第１０超限流遮断器３９，４０が遮断動作を開始する。 Thus, when each short-circuit current changes, the positive direction short-circuit current I1aΣ (positive I1aΣ or + I1aΣ) flowing through the ninth and tenth supercurrent limiters 39, 40 is the ninth and tenth after the time t2 from the occurrence of the short-circuit. The positive direction overcurrent set value I1aoc of the tenth supercurrent breaker 39, 40 becomes +15 (reaching the operating point f1 in the figure). At this time, the ninth and tenth supercurrent breakers 39, 40 are Start the shut-off operation.

また、第１３及び第１４超限流遮断器４３，４４に流れる逆方向短絡電流Ｉ１ｃΣ（逆Ｉ１ｃΣ又は−Ｉ１ｃΣ）は、短絡発生から時間ｔ１（＜ｔ２）後にその第１３及び第１４超限流遮断器４３，４４の逆方向過電流設定値Ｉ１ｃＲである−６になり（同図の動作点ｒ１に達し）、この時に第１３及び第１４超限流遮断器４３，４４が遮断動作を開始する。 The reverse short-circuit current I1cΣ (reverse I1cΣ or −I1cΣ) flowing through the thirteenth and fourteenth supercurrent limiters 43 and 44 is the thirteenth and fourteenth supercurrent limit after time t1 (<t2) from the occurrence of the short circuit. The reverse overcurrent set value I1cR of the circuit breakers 43 and 44 is -6 (which reaches the operating point r1 in the figure), and at this time, the 13th and 14th supercurrent breakers 43 and 44 start the circuit breaking operation. To do.

これら第９及び第１０超限流遮断器３９，４０並びに第１３及び第１４超限流遮断器４３，４４の遮断動作により、短絡点１ＢＰ，１ＢＮが切り離される。
一方、第１５及び第１６超限流遮断器４５，４６の動作点、すなわち正方向短絡電流Ｉ２ｃΣ（正Ｉ２ｃΣ又は＋Ｉ２ｃΣ）が当該第１５及び第１６超限流遮断器４５，４６の正方向過電流設定値Ｉ２ｃｏｃである＋１１（同図の点ｆ２）に達するまでの時間が、短絡発生から前記時間ｔ１及びｔ２よりも後の時間ｔ３となっている。 The short-circuit points 1BP and 1BN are disconnected by the breaking operation of the ninth and tenth supercurrent breakers 39 and 40 and the thirteenth and fourteenth supercurrent breakers 43 and 44.
On the other hand, the operating point of the fifteenth and sixteenth supercurrent breakers 45, 46, that is, the positive short-circuit current I2cΣ (positive I2cΣ or + I2cΣ) The time until reaching the current set value I2coc +11 (point f2 in the figure) is a time t3 after the time t1 and t2 from the occurrence of the short circuit.

また、第５乃至第８超限流遮断器３５〜３８の動作点、すなわち正方向短絡電流Ｉｇ１，Ｉｇ２（正Ｉｇ１又は＋Ｉｇ１，正Ｉｇ２又は＋Ｉｇ２）が当該第５乃至第８超限流遮断器３５〜３８の正方向過電流設定値Ｉｇ１ｏｃ，Ｉｇ２ｏｃである＋６（同図の点ｆ３，ｆ４）に達するまでの時間が、短絡発生から前記時間ｔ１及びｔ２よりも後の時間ｔ５及びｔ７となっている。 Further, the operating points of the fifth to eighth supercurrent limiters 35 to 38, that is, the positive-direction short-circuit currents Ig1 and Ig2 (positive Ig1 or + Ig1, positive Ig2 or + Ig2) are the fifth to eighth supercurrent limiters. The time required to reach the positive overcurrent set values Ig1oc and Ig2oc of +35 to 35 (points f3 and f4 in the figure) is times t5 and t7 after the occurrence of the short circuit and after the times t1 and t2. ing.

また、第１１及び第１２超限流遮断器４１，４２の動作点、すなわち正方向短絡電流Ｉ２ａΣ又はＩ２ｂΣ（正Ｉ２ａΣ若しくは＋Ｉ２ａΣ又は正Ｉ２ｂΣ若しくは＋Ｉ２ｂΣ）が当該第１１及び第１２超限流遮断器４１，４２の正方向過電流設定値Ｉ２ａｏｃである＋１５（同図の点ｆ５）に達するまでの時間が、短絡発生から前記時間ｔ１及びｔ２よりも後の時間ｔ８となっている。 Further, the operating points of the eleventh and twelfth supercurrent limiters 41, 42, that is, the positive direction short-circuit current I2aΣ or I2bΣ (positive I2aΣ or + I2aΣ or positive I2bΣ or + I2bΣ) are the eleventh and twelfth supercurrent limiters. The time until the positive overcurrent set value I2aoc of 41 and 42 reaches +15 (point f5 in the figure) is the time t8 after the time t1 and t2 from the occurrence of the short circuit.

また、第１乃至第４超限流遮断器３１〜３４の動作点、すなわち逆方向短絡電流Ｉｍａ１，Ｉｍａ２（逆Ｉｍａ１又は−Ｉｍａ１，逆Ｉｍａ２又は−Ｉｍａ２）が当該第１乃至第４超限流遮断器３１〜３４の逆方向過電流設定値Ｉｍａ１Ｒ，Ｉｍａ２Ｒである−２．２（同図の点ｒ２，ｒ３）に達するまでの時間が、短絡発生から前記時間ｔ１及びｔ２よりも後の時間ｔ４及びｔ６となっている。 Further, the operating points of the first to fourth supercurrent limiters 31 to 34, that is, the reverse short-circuit currents Ima1 and Ima2 (reverse Ima1 or -Ima1, reverse Ima2 or -Ima2) are the first to fourth supercurrent limiters. The time until the reverse overcurrent set values Ima1R and Ima2R of the circuit breakers 31 to 34 are −2.2 (points r2 and r3 in the figure) is the time after the occurrence of the short circuit after the times t1 and t2. t4 and t6.

以上のように、短絡点１ＢＰと短絡点１ＢＮとの間で短絡事故発生時に、第９、第１０、第１３及び第１４超限流遮断器３９，４０，４３，４４以外の第１乃至第８、第１１、第１２、第１５、第１６超限流遮断器３１〜３８，４１，４２，４５，４６に先行して、当該第９、第１０、第１３及び第１４超限流遮断器３９，４０，４３，４４が遮断動作を開始することで、第１乃至第８、第１１、第１２、第１５及び第１６超限流遮断器３１〜３８，４１，４２，４５，４６が遮断動作する前に短絡点１ＢＰ，１ＢＮが切り離される。これにより、短絡点１ＢＰと短絡点１ＢＮとの間で短絡事故が発生しても、第１乃至第８、第１１、第１２、第１５及び第１６超限流遮断器３１〜３８，４１，４２，４５，４６が遮断動作（保護動作）しないので、それら超限流遮断器に保護されている他の健全回路への給電を継続させることができ、システムの安全を確保することができる。 As described above, when a short-circuit accident occurs between the short-circuit point 1BP and the short-circuit point 1BN, the first to the other than the ninth, tenth, thirteenth, and fourteenth supercurrent limiters 39, 40, 43, and 44 are used. The ninth, tenth, thirteenth, and fourteenth supercurrent limiters are preceded by the eighth, eleventh, twelfth, fifteenth, and sixteenth supercurrent limiters 31-38, 41, 42, 45, and 46. The first to eighth, eleventh, twelfth, fifteenth and sixteenth supercurrent limiters 31 to 38, 41, 42, 45, and 46 are started by the breakers 39, 40, 43, and 44 starting the breaking operation. Short circuit points 1BP and 1BN are disconnected before the breaking operation. Thereby, even if a short-circuit accident occurs between the short-circuit point 1BP and the short-circuit point 1BN, the first to eighth, eleventh, twelfth, fifteenth and sixteenth supercurrent limiter breakers 31 to 38, 41, Since 42, 45, and 46 do not perform a cut-off operation (protection operation), it is possible to continue power supply to other healthy circuits protected by these supercurrent breakers, and to ensure system safety.

なお、前記表１には、短絡点１ＢＰと短絡点１ＢＮとの間で短絡事故が発生した時の各超限流遮断器３１〜４６の動作状態（○又は×で示す）を示している。
（３−２）短絡点ＣＰと短絡点ＣＮとの間で短絡事故が発生した場合（図８、図９、図１０）
図８は、短絡点ＣＰと短絡点ＣＮとの間で短絡事故発生時の短絡電流の流れを電路系統図をベースに記載したものを示し、図９は、その電路系統図に対応するインピーダンスマップを示す。また、図１０は、短絡点ＣＰと短絡点ＣＮとの間で短絡事故発生時の超限流遮断器での検出電流及び保護動作を示す。 In Table 1, the operating states (indicated by ◯ or x) of the respective supercurrent breakers 31 to 46 when a short circuit accident occurs between the short circuit point 1BP and the short circuit point 1BN are shown.
(3-2) When a short circuit accident occurs between the short circuit point CP and the short circuit point CN (FIG. 8, FIG. 9, FIG. 10)
FIG. 8 shows a flow of a short-circuit current when a short-circuit accident occurs between the short-circuit point CP and the short-circuit point CN based on the circuit diagram, and FIG. 9 shows an impedance map corresponding to the circuit diagram. Indicates. FIG. 10 shows the detection current and the protection operation in the ultracurrent breaker when a short circuit accident occurs between the short circuit point CP and the short circuit point CN.

図８及び図９に示すように、短絡点ＣＰと短絡点ＣＮとの間で短絡事故が発生すると、各々の回路網からは当該回路網の回路定数によって決まる短絡電流がそれぞれ流出し、短絡点ＣＰと短絡点ＣＮとの間に短絡電流（合計電流）ＩΣが流れる。ここで、短絡電流ＩΣは下記式のようになる。
ＩΣ＝Ｉ１ｃΣ＋Ｉ２ｃΣ
ここで、１号系の回路と２号系の回路の電気的定数及びインピーダンスが左右対称で同値であると仮定すれば、短絡電流Ｉ１ｃΣと短絡電流Ｉ２ｃΣとの関係は
Ｉ１ｃΣ＝Ｉ２ｃΣ
となる。例えば、Ｉ１ｃΣについては下記式のようになる。 As shown in FIGS. 8 and 9, when a short circuit accident occurs between the short circuit point CP and the short circuit point CN, a short circuit current determined by the circuit constant of the circuit network flows out from each circuit network. A short-circuit current (total current) IΣ flows between CP and the short-circuit point CN. Here, the short-circuit current IΣ is expressed by the following equation.
IΣ = I1cΣ + I2cΣ
Assuming that the electrical constants and impedances of the No. 1 circuit and No. 2 circuit are symmetrical and have the same value, the relationship between the short-circuit current I1cΣ and the short-circuit current I2cΣ is I1cΣ = I2cΣ
It becomes. For example, I1cΣ is expressed by the following formula.

Ｉ１ｃΣ＝Ｉｇ１＋Ｉ１ｂΣ
Ｉ１ｂΣ＝Ｉｂ１＋Ｉｍａ１（＝Ｉ１ａΣ）
ここで、電流Ｉｂ１は、正方向電流であり、第１蓄電池１から短絡点ＣＰ，ＣＮに向かう短絡電流となり、電流Ｉｍａ１は、逆方向電流であり、第１動力３の電動機負荷等に起因して、短絡点ＣＰ，ＣＮに向かう短絡電流となる。 I1cΣ = Ig1 + I1bΣ
I1bΣ = Ib1 + Ima1 (= I1aΣ)
Here, the current Ib1 is a forward current and is a short-circuit current from the first storage battery 1 toward the short-circuit points CP and CN. The current Ima1 is a reverse-direction current and is caused by the motor load of the first power 3 and the like. Thus, the short-circuit current is directed toward the short-circuit points CP and CN.

このとき、短絡点ＣＰ，ＣＮの近傍に配置されている第１３乃至第１６超限流遮断器４３〜４６には、正方向短絡電流Ｉ１ｃΣ，Ｉ２ｃΣ（正Ｉ１ｃΣ又は＋Ｉ１ｃΣ，正Ｉ２ｃΣ又は＋Ｉ２ｃΣ）が流れる。
これら各短絡電流の短絡事故発生時からの変化は図１０に示すようになる。この図１０に示すように各短絡電流が変化するとき、第１３乃至第１６超限流遮断器４３〜４６に流れる正方向短絡電流Ｉ１ｃΣ，Ｉ２ｃΣ（正Ｉ１ｃΣ又は＋Ｉ１ｃΣ，正Ｉ２ｃΣ又は＋Ｉ２ｃΣ）はともに、短絡発生から時間ｔ１後にその第１３乃至第１６超限流遮断器４３〜４６の正方向過電流設定値Ｉ１ｃｏｃ，Ｉ２ｃｏｃである＋１１に達し（同図の動作点ｆ１に達し）、この時に第１３乃至第１６超限流遮断器４３〜４６が遮断動作を開始する。 At this time, positive direction short circuit currents I1cΣ and I2cΣ (positive I1cΣ or + I1cΣ, positive I2cΣ or + I2cΣ) are provided in the thirteenth to sixteenth supercurrent limiters 43 to 46 disposed in the vicinity of the short-circuit points CP and CN. Flowing.
Changes in these short-circuit currents from the occurrence of a short-circuit accident are as shown in FIG. As shown in FIG. 10, when the short-circuit currents change, the positive-direction short-circuit currents I1cΣ and I2cΣ (positive I1cΣ or + I1cΣ, positive I2cΣ or + I2cΣ) flowing through the thirteenth to sixteenth supercurrent limiters 43 to 46 are both After the time t1 from the occurrence of the short circuit, the positive overcurrent set values I1coc and I2coc of the thirteenth to sixteenth supercurrent breakers 43 to 46 reach +11 (the operating point f1 in the figure is reached). The thirteenth to sixteenth supercurrent breakers 43 to 46 start the breaking operation.

一方、第９乃至第１２超限流遮断器３９〜４２の動作点、すなわち正方向短絡電流Ｉ１ａΣ又はＩ１ｂΣ（正Ｉ１ａΣ若しくは＋Ｉ１ａΣ又は正Ｉ１ｂΣ若しくは＋Ｉ１ｂΣ），Ｉ２ａΣ又はＩ２ｂΣ（正Ｉ２ａΣ若しくは＋Ｉ２ａΣ又は正Ｉ２ｂΣ若しくは＋Ｉ２ｂΣ）が当該第９乃至第１２超限流遮断器３９〜４２の正方向過電流設定値Ｉ１ａｏｃ，Ｉ２ａｏｃである＋１５（同図の点ｆ２）に達するまでの時間が、短絡発生から前記時間ｔ１よりも後の時間ｔ２となっている。 On the other hand, the operating points of the ninth to twelfth supercurrent limiters 39 to 42, that is, the positive direction short-circuit current I1aΣ or I1bΣ (positive I1aΣ or + I1aΣ or positive I1bΣ or + I1bΣ), I2aΣ or I2bΣ (positive I2aΣ or + I2aΣ or positive I2bΣ Alternatively, the time from when the short circuit occurs until the time when + I2bΣ) reaches +15 (point f2 in the figure), which is the positive overcurrent set values I1aoc and I2aoc of the ninth to twelfth supercurrent breakers 39 to 42, is Time t2 is later than t1.

また、第５乃至第８超限流遮断器３５〜３８の動作点、すなわち正方向短絡電流Ｉｇ１，Ｉｇ２（正Ｉｇ１又は＋Ｉｇ１，正Ｉｇ２又は＋Ｉｇ２）が当該第５乃至第８超限流遮断器３５〜３８の正方向過電流設定値Ｉｇ１ｏｃ，Ｉｇ２ｏｃである＋６（同図の点ｆ３）に達するまでの時間が、短絡発生から前記時間ｔ１よりも後の時間ｔ４となっている。
また、第１乃至第４超限流遮断器３１〜３４の動作点、すなわち逆方向短絡電流Ｉｍａ１，Ｉｍａ２（逆Ｉｍａ１又は−Ｉｍａ１，逆Ｉｍａ２又は−Ｉｍａ２）が当該第１乃至第４超限流遮断器３１〜３４の逆方向過電流設定値Ｉｍａ１Ｒ，Ｉｍａ２Ｒである−２．２（同図の点ｒ１）に達するまでの時間が、短絡発生から前記時間ｔ１よりも後の時間ｔ３となっている。 Further, the operating points of the fifth to eighth supercurrent limiters 35 to 38, that is, the positive-direction short-circuit currents Ig1 and Ig2 (positive Ig1 or + Ig1, positive Ig2 or + Ig2) are the fifth to eighth supercurrent limiters. The time required to reach +6 (point f3 in the figure) which is the positive overcurrent set values Ig1oc and Ig2oc of 35 to 38 is a time t4 after the time t1 from the occurrence of the short circuit.
Further, the operating points of the first to fourth supercurrent limiters 31 to 34, that is, the reverse short-circuit currents Ima1 and Ima2 (reverse Ima1 or -Ima1, reverse Ima2 or -Ima2) are the first to fourth supercurrent limiters. The time required to reach the reverse overcurrent setting values Ima1R and Ima2R of −2.2 (point r1 in the figure) of the circuit breakers 31 to 34 is a time t3 after the time t1 from the occurrence of the short circuit. Yes.

以上のように、短絡点ＣＰと短絡点ＣＮとの間で短絡事故発生時に、第１３乃至第１６超限流遮断器４３〜４６以外の第１乃至第１２限流遮断器３１〜４２に先行して、当該第１３乃至第１６超限流遮断器４３〜４６が遮断動作を開始することで、第１乃至第１２超限流遮断器３１〜４２が遮断動作する前に短絡点ＣＰ，ＣＮが切り離される。これにより、短絡点ＣＰと短絡点ＣＮとの間で短絡事故が発生しても、第１乃至第１２超限流遮断器３１〜４２が遮断動作（保護動作）しないので、それら超限流遮断器に保護されている他の健全回路への給電を継続させることができ、システムの安全を確保することができる。 As described above, when a short circuit accident occurs between the short circuit point CP and the short circuit point CN, the first to twelfth current limit circuit breakers 31 to 42 other than the thirteenth to sixteenth ultra current limit circuit breakers 43 to 46 precede. Then, when the thirteenth to sixteenth supercurrent breakers 43 to 46 start the breaking operation, the short-circuit points CP and CN before the first to twelfth supercurrent breakers 31 to 42 perform the breaking operation. Is cut off. As a result, even if a short-circuit accident occurs between the short-circuit point CP and the short-circuit point CN, the first to twelfth supercurrent breakers 31 to 42 do not perform a break operation (protection operation). The power supply to other healthy circuits protected by the device can be continued, and the safety of the system can be ensured.

なお、前記表１には、短絡点ＣＰと短絡点ＣＮとの間で短絡事故が発生した時の各超限流遮断器３１〜４６の動作状態（○又は×で示す）を示している。
（３−３）短絡点１ＡＰと短絡点１ＡＮとの間で短絡事故が発生した場合（図１１、図１２、図１３）
図１１は、短絡点１ＡＰと短絡点１ＡＮとの間で短絡事故発生時の短絡電流の流れを電路系統図をベースに記載したものを示し、図１２は、その電路系統図に対応するインピーダンスマップを示す。また、図１３は、短絡点１ＡＰと短絡点１ＡＮとの間で短絡事故発生時の超限流遮断器での検出電流及び保護動作を示す。 Table 1 shows the operating states (indicated by circles or crosses) of the respective supercurrent breakers 31 to 46 when a short circuit accident occurs between the short circuit point CP and the short circuit point CN.
(3-3) When a short circuit accident occurs between the short circuit point 1AP and the short circuit point 1AN (FIGS. 11, 12, and 13)
FIG. 11 shows a flow of a short-circuit current when a short-circuit accident occurs between the short-circuit point 1AP and the short-circuit point 1AN based on the circuit diagram, and FIG. 12 shows an impedance map corresponding to the circuit diagram. Indicates. FIG. 13 shows the detected current and the protective operation in the ultracurrent breaker when a short circuit accident occurs between the short circuit point 1AP and the short circuit point 1AN.

図１１及び図１２に示すように、短絡点１ＡＰと短絡点１ＡＮとの間で短絡事故が発生すると、各々の回路網からは当該回路網の回路定数によって決まる短絡電流がそれぞれ流出し、短絡点１ＡＰと短絡点１ＡＮとの間に短絡電流（合計電流）ＩΣが流れる。ここで、短絡電流ＩΣは下記式のようになる。
ＩΣ＝Ｉｂ１＋Ｉ１ａΣ
Ｉ１ａΣ＝Ｉｇ１＋Ｉ１ｃΣ（＝Ｉ１ｂΣ）
Ｉ１ｃΣ＝Ｉｍ＋Ｉ２ｃΣ
Ｉ２ｃΣ＝Ｉｇ２＋Ｉ２ｂΣ
Ｉ２ｂΣ＝Ｉｂ２＋Ｉｍａ２（＝Ｉ２ａΣ）
ここで、電流Ｉｂ１，Ｉｂ２は、正方向電流であり、それぞれ第１及び第２蓄電池１，２から短絡点１ＡＰ，１ＡＮに向かう短絡電流となり、電流Ｉｍａ２は、逆方向電流であり、第２動力４の電動機負荷等に起因して、短絡点１ＡＰ，１ＡＮに向かう短絡電流となり、電流Ｉｇ１，Ｉｇ２は、正方向電流であり、それぞれ第１及び第２発電機５，６から短絡点１ＡＰ，１ＡＮに向かう短絡電流であり、電流Ｉｍは、逆方向電流であり、電動機７から短絡点１ＡＰ，１ＡＮに向かう短絡電流となる。また、短絡電流Ｉ１ａΣは、逆方向電流（逆Ｉ１ａΣ又は−Ｉ１ａΣ）である。 As shown in FIG. 11 and FIG. 12, when a short circuit accident occurs between the short circuit point 1AP and the short circuit point 1AN, a short circuit current determined by the circuit constant of the circuit network flows out from each circuit network. A short-circuit current (total current) IΣ flows between 1AP and the short-circuit point 1AN. Here, the short-circuit current IΣ is expressed by the following equation.
IΣ = Ib1 + I1aΣ
I1aΣ = Ig1 + I1cΣ (= I1bΣ)
I1cΣ = Im + I2cΣ
I2cΣ = Ig2 + I2bΣ
I2bΣ = Ib2 + Ima2 (= I2aΣ)
Here, the currents Ib1 and Ib2 are forward currents, which are short-circuit currents from the first and second storage batteries 1 and 2 to the short-circuit points 1AP and 1AN, respectively, and the current Ima2 is a reverse-direction current and the second power 4 is a short-circuit current toward the short-circuit points 1AP and 1AN, and the currents Ig1 and Ig2 are positive currents, and the short-circuit points 1AP and 1AN from the first and second generators 5 and 6, respectively. The current Im is a reverse current and is a short-circuit current from the motor 7 toward the short-circuit points 1AP and 1AN. The short-circuit current I1aΣ is a reverse current (reverse I1aΣ or -I1aΣ).

このとき、短絡点１ＡＰ，１ＡＮの近傍に配置されている第１及び第２超限流遮断器３１，３２には、短絡電流ＩΣが流れる。ここで、短絡点１ＡＰ，１ＡＮが第１蓄電池１に近いためインピーダンスが小さくなることから、短絡電流ＩΣは、高電流突進率短絡電流、過大短絡電流となる。
そして、このときの各短絡電流の短絡事故発生時からの変化は図１３に示すようになる。この図１３に示すように各短絡電流が変化するとき、第１及び第２超限流遮断器３１，３２に短絡電流ＩΣが流れ、その短絡電流ＩΣは、短絡発生から時間ｔ１後にその第１及び第２超限流遮断器３１，３２の正方向過電流設定値Ｉｍａ１ｏｃである＋２．２に達し（同図の動作点ｆ１に達し）、この時に第１及び第２超限流遮断器３１，３２が遮断動作を開始する。 At this time, a short-circuit current IΣ flows through the first and second supercurrent limiters 31 and 32 disposed in the vicinity of the short-circuit points 1AP and 1AN. Here, since the short-circuit points 1AP and 1AN are close to the first storage battery 1 and the impedance is small, the short-circuit current IΣ becomes a high current rush rate short-circuit current and an excessive short-circuit current.
And the change from the time of the occurrence of a short circuit accident of each short circuit current at this time is as shown in FIG. As shown in FIG. 13, when each short-circuit current changes, a short-circuit current IΣ flows through the first and second supercurrent-limiting circuit breakers 31 and 32, and the short-circuit current IΣ is the first short-time current tΣ after the occurrence of the short-circuit. And the positive overcurrent set value Ima1oc of the second supercurrent breaker 31, 32 reaches +2.2 (reaching the operating point f1 in the figure). At this time, the first and second supercurrent breakers 31 32 start the shut-off operation.

一方、第９及び第１０超限流遮断器３９，４０の動作点、すなわち逆方向短絡電流Ｉ１ａΣ又はＩ１ｂΣ（逆Ｉ１ａΣ若しくは−Ｉ１ａΣ又は逆Ｉ１ｂΣ若しくは−Ｉ１ｂΣ）が当該第９及び第１０超限流遮断器３９，４０の逆方向過電流設定値Ｉ１ａＲである−６（同図の点ｒ１）に達するまでの時間が、短絡発生から前記時間ｔ１よりも後の時間ｔ２となっている。 On the other hand, the operating points of the ninth and tenth current limit breakers 39, 40, that is, the reverse short-circuit current I1aΣ or I1bΣ (reverse I1aΣ or −I1aΣ or reverse I1bΣ or −I1bΣ) correspond to the ninth and tenth supercurrent limiters. The time until the reverse overcurrent set value I1aR of −6 (point r1 in the figure) of the circuit breakers 39 and 40 is reached is a time t2 after the time t1 from the occurrence of the short circuit.

また、第１３及び第１４超限流遮断器４３，４４の動作点、すなわち逆方向短絡電流Ｉ１ｃΣ（逆Ｉ１ｃΣ又は−Ｉ１ｃΣ）が当該第１３及び第１４超限流遮断器４３，４４の逆方向過電流設定値Ｉ１ｃＲである−６（同図の点ｒ２）に達するまでの時間が、短絡発生から前記時間ｔ１よりも後の時間ｔ３となっている。
また、第１５及び第１６超限流遮断器４５，４６の動作点、すなわち正方向短絡電流Ｉ２ｃΣ（正Ｉ２ｃΣ又は＋Ｉ２ｃΣ）が当該第１５及び第１６超限流遮断器４５，４６の正方向過電流設定値Ｉ２ｃｏｃである＋１１（同図の点ｆ２）に達するまでの時間が、短絡発生から前記時間ｔ１よりも後の時間ｔ４となっている。 Further, the operating points of the thirteenth and fourteenth supercurrent breakers 43, 44, that is, the reverse short-circuit current I1cΣ (reverse I1cΣ or -I1cΣ) is the reverse direction of the thirteenth and fourteenth supercurrent breakers 43, 44. The time required to reach the overcurrent set value I1cR of −6 (point r2 in the figure) is the time t3 after the time t1 after the occurrence of the short circuit.
Further, the operating point of the fifteenth and sixteenth supercurrent breakers 45, 46, that is, the positive short-circuit current I2cΣ (positive I2cΣ or + I2cΣ) is the positive overshoot of the fifteenth and sixteenth supercurrent breakers 45, 46. The time until reaching the current set value I2coc +11 (point f2 in the figure) is the time t4 after the time t1 from the occurrence of the short circuit.

また、第１１及び第１２超限流遮断器４１，４２の動作点、すなわち正方向短絡電流Ｉ２ａΣ又はＩ２ｂΣ（正Ｉ２ａΣ若しくは＋Ｉ２ａΣ又は正Ｉ２ｂΣ若しくは＋Ｉ２ｂΣ）が当該第１１及び第１２超限流遮断器４１，４２の正方向過電流設定値Ｉ２ａｏｃである＋１５（同図の点ｆ３）に達するまでの時間が、短絡発生から前記時間ｔ１よりも後の時間ｔ５となっている。 Further, the operating points of the eleventh and twelfth supercurrent limiters 41, 42, that is, the positive direction short-circuit current I2aΣ or I2bΣ (positive I2aΣ or + I2aΣ or positive I2bΣ or + I2bΣ) are the eleventh and twelfth supercurrent limiters. The time required to reach the positive overcurrent set value I2aoc of 41 and 42, +15 (point f3 in the figure), is a time t5 after the time t1 after the occurrence of the short circuit.

また、第５乃至第８超限流遮断器３５〜３８の動作点、すなわち正方向短絡電流Ｉｇ１，Ｉｇ２（正Ｉｇ１又は＋Ｉｇ１，正Ｉｇ２又は＋Ｉｇ２）が当該第５乃至第８超限流遮断器３５〜３８の正方向過電流設定値Ｉｇ１ｏｃ，Ｉｇ２ｏｃである＋６（同図の点ｆ４，ｆ５）に達するまでの時間が、短絡発生から前記時間ｔ１よりも後の時間ｔ６及びｔ８となっている。 Further, the operating points of the fifth to eighth supercurrent limiters 35 to 38, that is, the positive-direction short-circuit currents Ig1 and Ig2 (positive Ig1 or + Ig1, positive Ig2 or + Ig2) are the fifth to eighth supercurrent limiters. The time required to reach the positive overcurrent set values Ig1oc and Ig2oc of +35 to 35 (points f4 and f5 in the figure) is from time t6 to time t6 and t8 after the time t1. .

また、第３及び第４超限流遮断器３３，３４の動作点、すなわち逆方向短絡電流Ｉｍａ２（逆Ｉｍａ２又は−Ｉｍａ２）が当該第３及び第４超限流遮断器３３，３４の逆方向過電流設定値Ｉｍａ２Ｒである−２．２（同図の点ｒ３）に達するまでの時間が、短絡発生から前記時間ｔ１よりも後の時間ｔ７となっている。
以上のように、短絡点１ＡＰと短絡点１ＡＮとの間で短絡事故発生時に、第１及び第２超限流遮断器３１，３２以外の第３乃至第１６限流遮断器３３〜４６に先行して、当該第１及び第２超限流遮断器３１，３２が遮断動作を開始することで、第３乃至第１６超限流遮断器３３〜４６が遮断動作する前に短絡点１ＡＰ，１ＡＮが切り離される。これにより、短絡点１ＡＰと短絡点１ＡＮとの間で短絡事故が発生しても、第３乃至第１６超限流遮断器３３〜４６が遮断動作（保護動作）しないので、それら超限流遮断器に保護されている他の健全回路への給電を継続させることができ、システムの安全を確保することができる。 Further, the operating point of the third and fourth supercurrent breakers 33, 34, that is, the reverse short-circuit current Ima2 (reverse Ima2 or -Ima2) is the reverse direction of the third and fourth supercurrent breakers 33, 34. The time required to reach the overcurrent set value Ima2R of -2.2 (point r3 in the figure) is the time t7 after the time t1 after the occurrence of the short circuit.
As described above, when a short circuit accident occurs between the short circuit point 1AP and the short circuit point 1AN, the third to sixteenth current limit circuit breakers 33 to 46 other than the first and second super current limit circuit breakers 31 and 32 are preceded. Then, the first and second supercurrent breakers 31, 32 start the breaking operation, so that the short-circuit points 1AP, 1AN before the third to sixteenth supercurrent breakers 33-46 perform the breaking operation. Is cut off. As a result, even if a short-circuit accident occurs between the short-circuit point 1AP and the short-circuit point 1AN, the third to sixteenth supercurrent limiter breakers 33 to 46 do not perform a cut-off operation (protection operation). The power supply to other healthy circuits protected by the device can be continued, and the safety of the system can be ensured.

なお、前記表１には、短絡点１ＡＰと短絡点１ＡＮとの間で短絡事故が発生した時の各超限流遮断器３１〜４６の動作状態（○又は×で示す）を示している。
（３−４）短絡点１ＧＰと短絡点１ＧＮとの間で短絡事故が発生した場合（図１４、図１５、図１６）
図１４は、短絡点１ＧＰと短絡点１ＧＮとの間で短絡事故発生時の短絡電流の流れを電路系統図をベースに記載したものを示し、図１５は、その電路系統図に対応するインピーダンスマップを示す。また、図１６は、短絡点１ＧＰと短絡点１ＧＮとの間で短絡事故発生時の超限流遮断器での検出電流及び保護動作を示す。 Table 1 shows the operating states (indicated by circles or crosses) of each of the supercurrent breakers 31 to 46 when a short circuit accident occurs between the short circuit point 1AP and the short circuit point 1AN.
(3-4) When a short circuit accident occurs between the short circuit point 1GP and the short circuit point 1GN (FIGS. 14, 15, and 16)
FIG. 14 shows a flow of a short-circuit current when a short-circuit accident occurs between the short-circuit point 1GP and the short-circuit point 1GN based on the circuit diagram, and FIG. 15 shows an impedance map corresponding to the circuit diagram. Indicates. FIG. 16 shows the detection current and the protective operation in the ultra-current limiter when a short-circuit accident occurs between the short-circuit point 1GP and the short-circuit point 1GN.

図１４及び図１５に示すように、短絡点１ＧＰと短絡点１ＧＮとの間で短絡事故が発生すると、各々の回路網からは当該回路網の回路定数によって決まる短絡電流がそれぞれ流出し、短絡点１ＧＰと短絡点１ＧＮとの間に短絡電流（合計電流）ＩΣが流れる。ここで、短絡電流ＩΣは下記式のようになる。
ＩΣ＝Ｉ１ｂΣ＋Ｉ１ｃΣ
Ｉ１ｂΣ＝Ｉｂ１＋Ｉｍａ１（＝Ｉ１ａΣ）
Ｉ１ｃΣ＝Ｉｍ＋Ｉ２ｃΣ
Ｉ２ｃΣ＝Ｉｇ２＋Ｉ２ｂΣ
Ｉ２ｂΣ＝Ｉｂ２＋Ｉｍａ２（＝Ｉ２ａΣ）
ここで、電流Ｉｂ１，Ｉｂ２は、正方向電流であり、それぞれ第１及び第２蓄電池１，２から短絡点１ＧＰ，１ＧＮに向かう短絡電流となり、電流Ｉｍａ１，Ｉｍａ２は、逆方向電流であり、それぞれ第１及び第２動力３，４の電動機負荷等に起因して、短絡点１ＧＰ，１ＧＮに向かう短絡電流となり、電流Ｉｇ２は、正方向電流であり、第２発電機６から短絡点１ＧＰ，１ＧＮに向かう短絡電流であり、電流Ｉｍは、逆方向電流であり、電動機７から短絡点１ＧＰ，１ＧＮに向かう短絡電流となる。 As shown in FIGS. 14 and 15, when a short circuit accident occurs between the short circuit point 1GP and the short circuit point 1GN, a short circuit current determined by a circuit constant of the circuit network flows out from each circuit network. A short circuit current (total current) IΣ flows between 1GP and the short circuit point 1GN. Here, the short-circuit current IΣ is expressed by the following equation.
IΣ = I1bΣ + I1cΣ
I1bΣ = Ib1 + Ima1 (= I1aΣ)
I1cΣ = Im + I2cΣ
I2cΣ = Ig2 + I2bΣ
I2bΣ = Ib2 + Ima2 (= I2aΣ)
Here, the currents Ib1 and Ib2 are forward currents, which are short-circuit currents from the first and second storage batteries 1 and 2 to the short-circuit points 1GP and 1GN, respectively, and the currents Ima1 and Ima2 are reverse-direction currents, respectively. Due to the motor loads of the first and second powers 3 and 4, the short-circuit current is directed toward the short-circuit points 1 GP and 1 GN. The current Ig 2 is a positive current, and the short-circuit points 1 GP and 1 GN from the second generator 6. The current Im is a reverse current and is a short-circuit current from the electric motor 7 toward the short-circuit points 1GP and 1GN.

このとき、短絡点１ＧＰ，１ＧＮの近傍に配置されている第５及び第６超限流遮断器３５，３６には、短絡電流ＩΣが流れる。そして、各短絡電流の短絡事故発生時からの変化は図１６に示すようになる。
この図１６に示すように各短絡電流が変化するとき、第５及び第６超限流遮断器３５，３６に短絡電流（合計電流）ＩΣが流れ、その短絡電流（合計電流）ＩΣは、短絡発生から時間ｔ１後にその第５及び第６超限流遮断器３５，３６の逆方向過電流設定値Ｉｇ１である−０．４に達し（同図の動作点ｒ１に達し）、この時に第５及び第６超限流遮断器３５，３６が遮断動作を開始する。 At this time, a short-circuit current IΣ flows through the fifth and sixth supercurrent interrupters 35 and 36 disposed in the vicinity of the short-circuit points 1GP and 1GN. And the change from the time of the occurrence of a short circuit accident of each short circuit current is as shown in FIG.
As shown in FIG. 16, when each short-circuit current changes, a short-circuit current (total current) IΣ flows through the fifth and sixth supercurrent breakers 35, 36, and the short-circuit current (total current) IΣ is short-circuited. At time t1 after the occurrence, the reverse overcurrent set value Ig1 of -0.4 (the operating point r1 in the figure) of the fifth and sixth supercurrent interrupters 35, 36 is reached (at the operating point r1 in the figure), And the 6th supercurrent limit circuit breakers 35 and 36 start the breaking operation.

一方、第１３及び第１４超限流遮断器４３，４４の動作点、すなわち逆方向短絡電流Ｉ１ｃΣ（逆Ｉ１ｃΣ又は−Ｉ１ｃΣ）が当該第１３及び第１４超限流遮断器４３，４４の逆方向過電流設定値Ｉ１ｃＲである−６（同図の点ｒ２）に達するまでの時間が、短絡発生から前記時間ｔ１よりも後の時間ｔ２となっている。
また、第１５及び第１６超限流遮断器４５，４６の動作点、すなわち正方向短絡電流Ｉ２ｃΣ（正Ｉ２ｃΣ又は＋Ｉ２ｃΣ）が当該第１５及び第１６超限流遮断器４５，４６の正方向過電流設定値Ｉ２ｃｏｃである＋１１（同図の点ｆ２）に達するまでの時間が、短絡発生から前記時間ｔ１よりも後の時間ｔ４となっている。 On the other hand, the operating points of the thirteenth and fourteenth supercurrent breakers 43, 44, that is, the reverse short-circuit current I1cΣ (reverse I1cΣ or -I1cΣ) is the reverse direction of the thirteenth and fourteenth supercurrent breakers 43, 44. The time required to reach the overcurrent set value I1cR of −6 (point r2 in the figure) is the time t2 after the time t1 after the occurrence of the short circuit.
Further, the operating point of the fifteenth and sixteenth supercurrent breakers 45, 46, that is, the positive short-circuit current I2cΣ (positive I2cΣ or + I2cΣ) is the positive overshoot of the fifteenth and sixteenth supercurrent breakers 45, 46. The time until reaching the current set value I2coc +11 (point f2 in the figure) is the time t4 after the time t1 from the occurrence of the short circuit.

また、第７及び第８超限流遮断器３７，３８の動作点、すなわち正方向短絡電流Ｉｇ２（正Ｉｇ２又は＋Ｉｇ２）が当該第７及び第８超限流遮断器３７，３８の正方向過電流設定値Ｉｇ２ｏｃである＋６（同図の点ｆ４）に達するまでの時間が、短絡発生から前記時間ｔ１及びｔ２よりも後の時間ｔ８となっている。
また、第９乃至第１２超限流遮断器３９〜４２の動作点、すなわち正方向短絡電流Ｉ１ａΣ又はＩ１ｂΣ（正Ｉ１ａΣ若しくは＋Ｉ１ａΣ又は正Ｉ１ｂΣ若しくは＋Ｉ１ｂΣ），Ｉ２ａΣ又はＩ２ｂΣ（正Ｉ２ａΣ若しくは＋Ｉ２ａΣ又は正Ｉ２ｂΣ若しくは＋Ｉ２ｂΣ）が当該第９乃至第１２超限流遮断器３９〜４２の正方向過電流設定値Ｉ１ａｏｃ，Ｉ２ａｏｃである＋１５（同図の点ｆ１，ｆ３）に達するまでの時間が、短絡発生から前記時間ｔ１よりも後の時間ｔ３及びｔ５となっている。 Further, the operating point of the seventh and eighth supercurrent breakers 37, 38, that is, the positive short-circuit current Ig2 (positive Ig2 or + Ig2) exceeds the positive direction of the seventh and eighth supercurrent breakers 37, 38. The time until the current set value Ig2oc reaches +6 (point f4 in the figure) is the time t8 after the time t1 and t2 after the occurrence of the short circuit.
In addition, the operating points of the ninth to twelfth supercurrent breakers 39 to 42, that is, the positive direction short-circuit current I1aΣ or I1bΣ (positive I1aΣ or + I1aΣ or positive I1bΣ or + I1bΣ), I2aΣ or I2bΣ (positive I2aΣ or + I2aΣ or positive I2bΣ Alternatively, the time from when the short circuit occurs until + I2bΣ) reaches +15 (points f1 and f3 in the figure) that are the positive overcurrent set values I1aoc and I2aoc of the ninth to twelfth supercurrent breakers 39 to 42 Times t3 and t5 are later than the time t1.

また、第１乃至第４超限流遮断器３１〜３４の動作点、すなわち逆方向短絡電流Ｉｍａ１，Ｉｍａ２（逆Ｉｍａ１又は−Ｉｍａ１，逆Ｉｍａ２又は−Ｉｍａ２）が当該第１乃至第４超限流遮断器３１〜３４の逆方向過電流設定値Ｉｍａ１Ｒ，Ｉｍａ２Ｒである−２．２（同図の点ｒ３，ｒ４）に達するまでの時間が、短絡発生から前記時間ｔ１よりも後の時間ｔ６及びｔ７となっている。 Further, the operating points of the first to fourth supercurrent limiters 31 to 34, that is, the reverse short-circuit currents Ima1 and Ima2 (reverse Ima1 or -Ima1, reverse Ima2 or -Ima2) are the first to fourth supercurrent limiters. The time until the reverse overcurrent set values Ima1R and Ima2R of the circuit breakers 31 to 34 are −2.2 (points r3 and r4 in the same figure) is reached at time t6 after the time t1 and after the time t1 t7.

以上のように、短絡点１ＧＰと短絡点１ＧＮとの間で短絡事故発生時に、第５及び第６超限流遮断器３５，３６以外の第１乃至第４及び第７乃至第１６限流遮断器３１〜３４，３７〜４６に先行して、当該第５及び第６超限流遮断器３５，３６が遮断動作を開始することで、第１乃至第４及び第７乃至第１６限流遮断器３１〜３４，３７〜４６が遮断動作する前に短絡点１ＧＰ，１ＧＮが切り離される。これにより、短絡点１ＧＰと短絡点１ＧＮとの間で短絡事故が発生しても、第１乃至第４及び第７乃至第１６限流遮断器３１〜３４，３７〜４６が遮断動作（保護動作）しないので、それら超限流遮断器に保護されている他の健全回路への給電を継続させることができ、システムの安全を確保することができる。 As described above, when a short-circuit accident occurs between the short-circuit point 1GP and the short-circuit point 1GN, the first to fourth and seventh to sixteenth current limit interrupts other than the fifth and sixth supercurrent limiters 35, 36 Prior to the devices 31 to 34 and 37 to 46, the first and fourth and seventh to sixteenth current limiting interrupts are performed by the fifth and sixth supercurrent limiting circuit breakers 35 and 36 starting the interrupting operation. The short-circuit points 1GP and 1GN are disconnected before the devices 31 to 34 and 37 to 46 are cut off. Thereby, even if a short-circuit accident occurs between the short-circuit point 1GP and the short-circuit point 1GN, the first to fourth and seventh to sixteenth current-limiting circuit breakers 31 to 34 and 37 to 46 are interrupted (protective operation). ), It is possible to continue supplying power to other healthy circuits protected by the current limiting circuit breaker, and to ensure the safety of the system.

また、発電機５は、蓄電池１、動力３及び電動機７へ電力を供給することを目的とするから、通常運転状態では逆方向に電流が流れることはなく、発電機５の出力端で異常が発生したときのみ逆流が発生する。このようなことから、本実施形態のように、発電機５の回路の前後に設けた第５及び第６超限流遮断器３５，３６の逆方向過電流設定値Ｉｇ１Ｒを−０．４といったように小さい値に設定することで、発電機５の出力端の異常による僅かな逆方向電流の発生を速やかに検出して、速やかに回路を遮断することができるようになる。 Further, since the generator 5 is intended to supply electric power to the storage battery 1, the power 3 and the electric motor 7, current does not flow in the reverse direction in the normal operation state, and an abnormality occurs at the output end of the generator 5. Backflow occurs only when it occurs. For this reason, as in this embodiment, the reverse overcurrent set value Ig1R of the fifth and sixth ultracurrent breakers 35 and 36 provided before and after the circuit of the generator 5 is set to −0.4. By setting such a small value, it is possible to quickly detect the occurrence of a slight reverse current due to an abnormality in the output end of the generator 5, and to quickly shut down the circuit.

なお、前記表１には、短絡点１ＧＰと短絡点１ＧＮとの間で短絡事故が発生した時の各超限流遮断器３１〜４６の動作状態（○又は×で示す）を示している。
（４）効果の説明
次に本実施形態における効果を説明する。
前述したように、回路網の要所に第１乃至第１６超限流遮断器３１〜４６を配置し、その第１乃至第１６超限流遮断器３１〜４６（具体的には変流器３１ａ〜４６ａ）の過電流設定値を正方向及び逆方向それぞれについて個別に設定（その値の大きさも含めて設定）している。具体的には、正常動作運転状態に回路網を流れる定格電流、充電電流又は回生電流で第１乃至第１６超限流遮断器３１〜４６が遮断動作しないように、正方向過電流設定値及び逆方向過電流設定値を設定している。 In addition, the said Table 1 has shown the operation state (it shows by (circle) or x) of each supercurrent limit circuit breaker 31-46 when a short circuit accident generate | occur | produces between the short circuit point 1GP and the short circuit point 1GN.
(4) Description of Effects Next, effects of the present embodiment will be described.
As described above, the first to sixteenth supercurrent limiter breakers 31 to 46 are arranged at the important points of the network, and the first to sixteenth supercurrent limiter breakers 31 to 46 (specifically, current transformers). The overcurrent set values 31a to 46a) are individually set for the forward direction and the reverse direction (including the magnitudes of the values). Specifically, the positive direction overcurrent set value and the first over 16th current limiting circuit breakers 31 to 46 are not interrupted by the rated current, the charging current or the regenerative current flowing through the network in the normal operation state. The reverse overcurrent set value is set.

これにより、第１乃至第１６超限流遮断器３１〜４６は、回路網で短絡事故が発生したときの正方向又は逆方向の短絡電流を的確に検出して、速やかに遮断動作をすることができる。これにより、速やかに選択保護動作が行われる、すなわち必要最小限の超限流遮断器だけが遮断動作して、短絡事故発生点が速やかに切り離される。この結果、他の健全回路への給電を継続させ、システムの安全を確保することができるようになる。 Thereby, the 1st thru | or 16th super current limit circuit breakers 31-46 detect the short circuit current of the normal direction or a reverse direction when a short circuit accident generate | occur | produces in a circuit network accurately, and perform interruption | blocking operation | movement rapidly. Can do. As a result, the selective protection operation is promptly performed, that is, only the necessary minimum current limiting circuit breaker is interrupted, and the short-circuit accident occurrence point is quickly disconnected. As a result, power supply to other healthy circuits can be continued and the safety of the system can be ensured.

一方、従来方式についていうと、超限流遮断器の過電流設定値が正方向及び逆方向で同一値（絶対値で同一値）となっているので、回路網で短絡事故が発生したとき、選択保護動作させることが極めて困難、すなわち必要最小限の超限流遮断器だけを動作させることが困難となり、全ての超限流遮断器が動作してしまうこともあり、この場合、システムを全停電に至ることも予想される。本発明では、このような問題も発生しない。 On the other hand, regarding the conventional method, since the overcurrent set value of the supercurrent breaker is the same value in the forward direction and the reverse direction (same value in absolute value), when a short circuit accident occurs in the network, It is extremely difficult to operate with selective protection, that is, it is difficult to operate only the minimum necessary current limiting circuit breaker, and all the current limiting circuit breakers may operate. A power outage is also expected. In the present invention, such a problem does not occur.

（５）他の実施形態の説明
以上、本発明の実施形態を説明した。しかし、本発明は、前述の実施形態として実現されることに限定されるものではない。
すなわち、前記実施形態では、短絡点１ＢＰ，１ＢＮ，ＣＰ，ＣＮ，１ＡＰ，１ＡＮ，１ＧＰ，１ＧＮを特定して、その短絡点について短絡事故が発生した場合を説明した。しかし、これに限定されないことはいうまでもない。本発明は、他の部分で短絡事故が発生した場合にも適用できる。 (5) Description of Other Embodiments The embodiment of the present invention has been described above. However, the present invention is not limited to being realized as the above-described embodiment.
That is, in the above-described embodiment, the case where the short circuit point 1BP, 1BN, CP, CN, 1AP, 1AN, 1GP, 1GN is specified and a short circuit accident occurs at the short circuit point has been described. However, it goes without saying that the present invention is not limited to this. The present invention can also be applied when a short circuit accident occurs in another part.

例えば、図１、図２等に示すように、１号系における短絡点１ＢＰ，１ＢＮについて対称となる２号系の短絡点２ＢＰ，２ＢＮ、１号系における短絡点１ＡＰ，１ＡＮについて対称となる２号系の短絡点２ＡＰ，２ＡＮ、１号系における短絡点１ＧＰ，１ＧＮについて対称となる２号系の短絡点２ＧＰ，２ＧＮについて、それぞれ短絡事故が発生した場合でも本発明を適用できる。 For example, as shown in FIGS. 1 and 2, etc., the second system short circuit points 2BP and 2BN that are symmetric with respect to the first system short circuit points 1BP and 1BN are symmetric with respect to the short circuit points 1AP and 1AN with the second system. The present invention can be applied even when a short-circuit accident occurs at the second-system short-circuit points 2GP and 2GN that are symmetrical with respect to the second-system short-circuit points 2GP and 2GN, respectively.

また、前述の実施形態では過電流設定値を具体的な値として説明した。しかし、これに限定されるものではなく、他の値であってもよい。 In the above-described embodiment, the overcurrent set value has been described as a specific value. However, it is not limited to this, and other values may be used.

本発明が適用される直流給電回路網を示す電路系統図である。1 is an electric circuit diagram showing a DC power supply network to which the present invention is applied. 前記図１の電路系統図に対応するインピーダンスマップである。It is an impedance map corresponding to the electric circuit system diagram of the said FIG. 定格電流と過電流設定値との関係を示す図である。It is a figure which shows the relationship between a rated current and an overcurrent setting value. 正常動作時の回路網の電流の流れを示す電路系統図である。It is an electric circuit diagram which shows the flow of the electric current of the circuit network at the time of normal operation. 短絡点１ＢＰ，１ＢＮで短絡事故が発生したときの電流の流れを示す電路系統図である。It is an electric circuit system diagram which shows the flow of an electric current when a short circuit accident generate | occur | produces in the short circuit points 1BP and 1BN. 前記図５の電路系統図に対応するインピーダンスマップである。6 is an impedance map corresponding to the electric circuit diagram of FIG. 短絡点１ＢＰ，１ＢＮで短絡事故が発生したときの各超限流遮断器の遮断動作の説明に使用した図である。It is the figure used for description of interruption | blocking operation | movement of each supercurrent limiter circuit breaker when a short circuit accident generate | occur | produces in the short circuit points 1BP and 1BN. 短絡点ＣＰ，ＣＮで短絡事故が発生したときの電流の流れを示す電路系統図である。It is an electric circuit system diagram which shows the flow of an electric current when a short circuit accident generate | occur | produces in the short circuit points CP and CN. 前記図８の電路系統図に対応するインピーダンスマップである。It is an impedance map corresponding to the electric circuit system diagram of the said FIG. 短絡点ＣＰ，ＣＮで短絡事故が発生したときの各超限流遮断器の遮断動作の説明に使用した図である。It is the figure used for description of the interruption | blocking operation | movement of each supercurrent limiter circuit breaker when a short circuit accident generate | occur | produces in the short circuit points CP and CN. 短絡点１ＡＰ，１ＡＮで短絡事故が発生したときの電流の流れを示す電路系統図である。It is an electric circuit system diagram which shows the flow of an electric current when a short circuit accident generate | occur | produces in the short circuit points 1AP and 1AN. 前記図１１の電路系統図に対応するインピーダンスマップである。12 is an impedance map corresponding to the electric circuit diagram of FIG. 11. 短絡点１ＡＰ，１ＡＮで短絡事故が発生したときの各超限流遮断器の遮断動作の説明に使用した図である。It is the figure used for description of the interruption | blocking operation | movement of each supercurrent limit circuit breaker when a short circuit accident generate | occur | produces in the short circuit points 1AP and 1AN. 短絡点１ＧＰ，１ＧＮで短絡事故が発生したときの電流の流れを示す電路系統図である。It is an electric circuit system diagram which shows the flow of an electric current when a short circuit accident generate | occur | produces in the short circuit points 1GP and 1GN. 前記図１４の電路系統図に対応するインピーダンスマップである。It is an impedance map corresponding to the electric circuit system diagram of the said FIG. 短絡点１ＧＰ，１ＧＮで短絡事故が発生したときの各超限流遮断器の遮断動作の説明に使用した図である。It is the figure used for description of the interruption | blocking operation | movement of each supercurrent limiting circuit breaker when a short circuit accident generate | occur | produces in the short circuit points 1GP and 1GN. 電路系統図（直流給電回路網）の一部を示す図である。It is a figure which shows a part of electric circuit system diagram (DC feeding network). 遮断器の保護動作特性を示す特性図である。It is a characteristic view which shows the protection operation characteristic of a circuit breaker. 短絡発生時の電流挙動を示す特性図である。It is a characteristic view which shows the electric current behavior at the time of short circuit generation | occurrence | production.

符号の説明Explanation of symbols

１，２蓄電池
３，４動力
５，６発電機
７電動機
１１〜２２遮断器（気中遮断器）
３１〜４６超限流遮断器
３１ａ〜４６ａ変流器（電流検出器）
３１ｃ〜４６ｃ限流ヒューズ DESCRIPTION OF SYMBOLS 1, 2 Storage battery 3, 4 Power 5, 6 Generator 7 Electric motor 11-22 Circuit breaker (air circuit breaker)
31-46 Current limiting circuit breaker 31a-46a Current transformer (current detector)
31c-46c Current limiting fuse

Claims

複数の電気機器と、当該複数の電気機器に対応させて配置され、かつ過電流を検出して遮断動作する遮断装置とを備えた直流給電回路網を保護する直流給電回路網の保護システムにおいて、
前記遮断装置が過電流を検出して遮断動作するための遮断動作電流値の大きさを、当該遮断装置内を流れる正方向電流及び逆方向電流毎に設定することを特徴とする直流給電回路網の保護システム。
In a protection system for a DC power supply circuit network that protects a DC power supply circuit network that includes a plurality of electrical devices and a circuit breaker that is disposed in correspondence with the plurality of electrical devices and detects an overcurrent,
A DC power supply network characterized in that a magnitude of a breaking operation current value for causing the breaking device to perform a breaking operation by detecting an overcurrent is set for each of a forward current and a backward current flowing in the breaking device. Protection system.