JP2006006044A - Short-circuit direction relay system - Google Patents

Short-circuit direction relay system Download PDF

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JP2006006044A
JP2006006044A JP2004180798A JP2004180798A JP2006006044A JP 2006006044 A JP2006006044 A JP 2006006044A JP 2004180798 A JP2004180798 A JP 2004180798A JP 2004180798 A JP2004180798 A JP 2004180798A JP 2006006044 A JP2006006044 A JP 2006006044A
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short
accident
circuit
detection
circuit direction
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Kenichi Aikawa
健一 相川
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Toshiba Corp
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Toshiba Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a short-circuit direction relay system which can surely determine a direction to an accident at a close end to detect the accident, continues operation even during counting up of a time-limiting timer, and can surely return to operation when the accident is removed during the counting up of the timer. <P>SOLUTION: When a short-circuit direction detection means 54d detects a short-circuit accident, the short-circuit direction detection means is switched by a relay characteristic selection means 57 to an over-current detection means 55o which regards the accident detection characteristics without direction properties to hold an operation state. Thereby, direction determination to the accident at a close end is performed to surely conduct a detection operation, allowing the operation to be continued even during the counting up of the time-limiting timer due to a time cooperation to positively cut off an accident point. The instant voltage effects on a host side is generated, even if this is recovered prior to the counting up of the time-limiting timer, and the accident detection characteristics can be positively recovered to a short-circuit detection characteristics 54d, without being left as over-current detection characteristics 55c as in the past. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、方向要素を有し、系統連係設備における送電線側の短絡事故を検出する短絡方向継電システムに関する。   The present invention relates to a short-circuit direction relay system that includes a direction element and detects a short-circuit accident on a power transmission line side in a grid connection facility.

図３は、自家用発電設備８を有し、電力会社設備である電源１と系統連係する系統連係設備を示す電力系統図である。このような電力系統では、電力会社設備である電源１により発電された電力は需要家に送電され、受電遮断器２、変圧器６及び連系遮断器７を介し自家用発電設備８と連系されている。このように自家用発電設備８を有し、外部の電力系統と連系される系統では、系統連系技術指針により受電部に短絡方向継電器５の設置が義務づけられている。   FIG. 3 is a power system diagram showing a system linkage facility having a private power generation facility 8 and system linkage with the power source 1 which is a power company facility. In such an electric power system, the electric power generated by the power source 1 which is an electric power company facility is transmitted to the consumer, and is connected to the private power generation facility 8 via the power receiving breaker 2, the transformer 6 and the interconnection breaker 7. ing. Thus, in the system having the private power generation facility 8 and interconnected with the external power system, installation of the short-circuit direction relay 5 in the power receiving unit is obligated by the system interconnection technical guidelines.

短絡方向継電器５は、計器用変流器３より受電電流を変換した電流要素Ｉ、計器用変圧器４より変換された電圧要素Ｖを取り込んでいる。継電器５は、入力された電流要素Ｉ、電圧要素Ｖの位相差、電流値により、予め設定した保護範囲（位置）に生じた短絡事故を検出する。すなわち、受電遮断器２より上位側である電力会社の電源１側の送電線に短絡事故が発生すると、前記位相差により方向を判別して事故検出し、受電遮断器２を遮断動作させて、それより下位の連係系統を切り離す。   The short-circuit direction relay 5 takes in the current element I obtained by converting the received current from the instrument current transformer 3 and the voltage element V converted by the instrument transformer 4. The relay 5 detects a short-circuit accident that has occurred in a preset protection range (position) based on the phase difference and current value of the input current element I and voltage element V. That is, when a short circuit accident occurs in the power transmission line on the power source 1 side of the power company that is higher than the power receiving breaker 2, the direction is determined by the phase difference to detect the accident, and the power receiving breaker 2 is cut off. Disconnect the lower linkage system.

ここで、短絡方向継電器５は、図４で示すように、方向性を有する短絡方向検出特性（手段）１１と、方向性を持たず電流値のみを判断する過電流検出特性（手段）１２とを有し、これらの特性を切替えて事故検出している（例えば、特許文献１参照）。すなわち、短絡方向検出特性１１は、短絡方向継電器５が、常時〜事故を検出するまでの特性であり、過電流検出特性１２は、事故検出後〜事故除去(常時)までの特性である。   Here, as shown in FIG. 4, the short-circuit direction relay 5 includes a directional short-circuit direction detection characteristic (means) 11, and an overcurrent detection characteristic (means) 12 that determines only a current value without directivity. The accident is detected by switching these characteristics (see, for example, Patent Document 1). That is, the short-circuit direction detection characteristic 11 is a characteristic until the short-circuit direction relay 5 detects an accident at all times, and the overcurrent detection characteristic 12 is a characteristic from after the accident detection to accident removal (always).

このように特性を変化させている理由は至近端で事故が生じた場合のためである。すなわち、至近端で短絡事故が発生すると、系統電圧は大きく低下する。短絡方向検出特性１１では３サイクル前の電圧を検出しており、至近端事故が発生して、電圧要素が低下しても方向判別が確実に行えるようにしている。   The reason why the characteristics are changed in this way is because an accident occurs at the close end. That is, when a short circuit accident occurs at the closest end, the system voltage is greatly reduced. The short-circuit direction detection characteristic 11 detects the voltage three cycles before, so that the direction can be reliably determined even if a near-end accident occurs and the voltage element decreases.

しかしながら、系統間の時間協調により、短絡方向継電器５に時限(３サイクル以上)を持たせている場合には、時限中に電圧要素が低下して方向判別ができなくなり、短絡方向検出特性１１では継電器動作が復帰してしまう。この復帰を防ぐために事故検出後は、過電流検出特性１２に切替え、電流の大きさのみを検出するようにして、電圧要素が低下しても継電器５が動作復帰しないようにしている。   However, if the short circuit direction relay 5 has a time limit (3 cycles or more) due to time coordination between the systems, the voltage element drops during the time period and the direction cannot be determined. Relay operation will be restored. In order to prevent this return, after the accident is detected, the overcurrent detection characteristic 12 is switched to detect only the magnitude of the current so that the relay 5 does not return to the operation even if the voltage element decreases.

このように、短絡方向継電器５の検出特性を、短絡方向検出特性１１から過電流検出特性１２に切替えることは、至近端短絡対策として有効であるが、次のような問題が生じた。すなわち、電力会社側の送電線で瞬時電圧低下が発生した場合に、図３で示した連係中の自家発電設備８から受電遮断器２を通って送電線に電流が流出する。このため、短絡方向継電器５の電流整定値によっては、この短絡方向継電器５が動作し、特性は過電流検出特性１２に変化する。   As described above, switching the detection characteristic of the short-circuit direction relay 5 from the short-circuit direction detection characteristic 11 to the overcurrent detection characteristic 12 is effective as a measure against a short circuit at the near end, but the following problem has occurred. That is, when an instantaneous voltage drop occurs in the transmission line on the power company side, a current flows out from the linked private power generation facility 8 shown in FIG. For this reason, depending on the current setting value of the short-circuit direction relay 5, the short-circuit direction relay 5 operates and the characteristic changes to the overcurrent detection characteristic 12.

短絡方向継電器５は、前述のように動作に時限を持たせている場合が多く、限時タイマーがカウントアップしきる前に、送電線で瞬時電圧低下が回復してしまうと、今度は送電線側から受電遮断器２を通って負荷電流が流入する。このとき継電器５の特性は過電流特性１２になっているため、負荷電流の方向は判断されず、この負荷電流が、継電器５の電流整定値より大きい場合には、短絡方向継電器５の動作が継続してしまうことになる。   As described above, the short-circuit direction relay 5 often has a time limit in its operation, and if the instantaneous voltage drop is recovered before the time limit timer counts up, the power transmission line side will now recover. The load current flows through the power receiving breaker 2. At this time, since the characteristic of the relay 5 is the overcurrent characteristic 12, the direction of the load current is not determined, and when the load current is larger than the current set value of the relay 5, the operation of the short-circuit direction relay 5 is It will continue.

短絡方向継電器５の動作出力は、図５で示すように不足電圧継電器９（図３には図示せず）の検出出力とアンド条件になっており、常時は不足電圧継電器９が動作しないことから遮断器２をトリップすることはなく、短絡方向継電器５は、過電流検出特性１２のままになってしまう。
特開２０００−９２６９３号公報 As shown in FIG. 5, the operation output of the short-circuit direction relay 5 is an AND condition with the detection output of the undervoltage relay 9 (not shown in FIG. 3), and the undervoltage relay 9 does not always operate. The circuit breaker 2 is not tripped, and the short-circuit direction relay 5 remains in the overcurrent detection characteristic 12.
JP 2000-92693 A

このように、至近端事故対策として、短絡方向検出特性で短絡事故検出後、過電流検出特性に切替えて、動作を維持することが行われていたが、上位系統で瞬時電圧降下が生じ、この瞬時電圧降下が限時タイマーのカウントアップ以前に回復してしまうと、短絡方向継電器の特性が過電流検出特性のままになってしまうという問題が生じた。   In this way, as a countermeasure for the near-end accident, after detecting the short-circuit accident with the short-circuit direction detection characteristic, switching to the over-current detection characteristic and maintaining the operation was performed, but an instantaneous voltage drop occurred in the host system, If this instantaneous voltage drop is recovered before the time-up timer counts up, there arises a problem that the characteristics of the short-circuit direction relay remain the overcurrent detection characteristics.

本発明の目的は、至近端事故で確実に方向判別して事故検出でき、限時タイマーカウントアップ中も動作継続し、なおかつ、タイマーカウントアップ中に事故除去された場合には確実に動作復帰する短絡方向継電システムを提供することにある。   It is an object of the present invention to reliably detect a direction by detecting a direction in a near-end accident, to continue operation even during a timer count-up, and to reliably return to operation when the accident is removed during the timer count-up. It is to provide a short-circuit direction relay system.

本発明の短絡方向継電システムは、保護対象系統から電流要素と電圧要素を入力し、これらの位相差及び電流値の大きさから、短絡事故が生じた位置を判定し、動作する短絡方向継電システムであって、前記位相差に基づく動作方向が予め設定された動作範囲に入り、かつ電流値が予め設定した値以上になると検出動作する短絡方向検出手段と、前記電流値が予め設定した値以上になると検出動作する過電流検出手段と、前記電圧値が予め設定した値以下になると検出動作する不足電圧検出手段と、常時は前記電流要素及び電圧要素に応動する事故検出手段として短絡方向検出手段を設定し、この短絡方向検出手段が動作すると、事故検出手段を前記過電流検出手段に切替え、この過電流検出手段が設定されている状態で、前記不足電圧検出手段が動作中であれば過電流検出手段を維持し、不足電圧検出手段が復帰すれば事故検出手段を前記短絡方向検出手段に戻すリレー特性選択手段と を備えたことを特徴とする。   The short-circuit direction relay system of the present invention inputs a current element and a voltage element from the system to be protected, determines the position where the short-circuit accident has occurred from the phase difference and the magnitude of the current value, and operates the short-circuit direction relay. A short-circuit direction detecting means for detecting an operation when an operation direction based on the phase difference is within a preset operation range and a current value is equal to or greater than a preset value, and the current value is preset. Overcurrent detection means that performs a detection operation when the voltage value exceeds a predetermined value, an undervoltage detection means that performs a detection operation when the voltage value falls below a preset value, and a short circuit direction as an accident detection means that always responds to the current element and the voltage element When the detection means is set and the short-circuit direction detection means operates, the accident detection means is switched to the overcurrent detection means, and the undervoltage detection is performed in a state where the overcurrent detection means is set. Stage is equal in operation to maintain the over-current detecting means, characterized in that the fault detection means when returning the undervoltage detection means and a relay characteristic selecting means for returning to the short-circuit direction detection means.

本発明によれば、短絡方向検出手段により短絡事故を検出すると、検出手段を過電流検出手段に切替えて動作状態を保持することにより、至近端事故に対して方向判定を行って確実に検出動作すると共に、上位側に瞬時電圧効果が生じ、これが限時タイマーのカウントアップ以前に回復しても、従来のように過電流検出特性のままになってしまうことなく、確実に短絡方向検出特性に復帰させることができ、所定の保護継電機能を実行することができる。   According to the present invention, when a short-circuit accident is detected by the short-circuit direction detection means, the detection means is switched to the overcurrent detection means and the operation state is maintained, so that the direction determination is performed for the near-end accident and reliably detected. In addition to operating, there is an instantaneous voltage effect on the upper side, and even if this recovers before the time limit timer counts up, the overcurrent detection characteristic does not remain as in the past, and the short-circuit direction detection characteristic is ensured. It can be restored and a predetermined protective relay function can be performed.

以下、本発明による短絡方向継電システムの一実施の形態について、図面を用いて詳細に説明する。   Hereinafter, an embodiment of a short-circuit direction relay system according to the present invention will be described in detail with reference to the drawings.

図１はこの実施の形態における短絡方向継電システム５０を示すブロック図である。この短絡方向継電システム５０は、図３で示した電力系統の受電部に設けられ、図３で示した計器用変流器３より受電電流を変換した電流要素Ｉ、計器用変圧器４より変換された電圧要素Ｖを入力する。これら電流要素Ｉ及び電圧要素Ｖは、入力変換モジュール５１、アナログ・ディジタル(Ａ／Ｄ)変換モジュール５２にて変換され、システムバス５３にのせられる。   FIG. 1 is a block diagram showing a short-circuit direction relay system 50 in this embodiment. This short-circuit direction relay system 50 is provided in the power receiving unit of the power system shown in FIG. 3, and includes a current element I obtained by converting the received current from the current transformer 3 shown in FIG. 3, and the instrument transformer 4. The converted voltage element V is input. These current element I and voltage element V are converted by an input conversion module 51 and an analog / digital (A / D) conversion module 52 and placed on a system bus 53.

システムバス５３には、短絡方向モジュール５４、過電流モジュール５５、不足電圧モジュール５６、リレー特性選択モジュール（手段）５７、トリップ出力モジュール５８がそれぞれ接続している。   A short circuit module 54, an overcurrent module 55, an undervoltage module 56, a relay characteristic selection module (means) 57, and a trip output module 58 are connected to the system bus 53, respectively.

短絡方向モジュール５４は、図２で拡大して示す短絡方向検出特性（手段）５４ｄを有する。すなわち、斜線で示す動作範囲が設定されており、システムバス５３を介してアナログ・ディジタル変換モジュール(Ａ／Ｄ)５２から電流要素と電圧要素とを入力し、これらの位相差及び電流値の大きさから事故判定を行う。すなわち、位相差に基づく動作方向が予め設定された動作範囲に入り、かつ電流値が予め設定した値以上になり、図示のごとく、電流値ＩＲが動作範囲（斜線領域）に入れば事故検出動作する。 The short circuit direction module 54 has a short circuit direction detection characteristic (means) 54d shown in an enlarged manner in FIG. In other words, an operating range indicated by diagonal lines is set, and current elements and voltage elements are input from the analog / digital conversion module (A / D) 52 via the system bus 53, and their phase difference and current value are large. Then, judge the accident. In other words, it enters the operation range in which the operation direction based on the phase difference preset, and the current value becomes more than a preset value, as shown in the drawing, fault detection when placed in a current value I R is the operating range (hatched region) Operate.

過電流モジュール５５は、図２で拡大して示す過電流検出特性（手段）５５ｏを有する。すなわち、方向性は持たず、システムバス５３を介してアナログ・ディジタル(Ａ／Ｄ)変換モジュール５２から電流要素を入力し、その電流値が予め設定した値以上（斜線範囲内）になると検出動作する。   The overcurrent module 55 has an overcurrent detection characteristic (means) 55o shown enlarged in FIG. That is, there is no directionality, and when the current element is input from the analog / digital (A / D) conversion module 52 via the system bus 53, and the current value exceeds a preset value (within the hatched area), the detection operation is performed. To do.

不足電圧モジュール５６は、図２で拡大して示す不足電圧検出特性（手段）５６ｕを有する。すなわち、方向性は持たず、システムバス５３を介してアナログ・ディジタル(Ａ／Ｄ)変換モジュール５２から電圧要素を入力し、その電圧値が予め設定した値以下（斜線範囲内）になると検出動作する。   The undervoltage module 56 has an undervoltage detection characteristic (means) 56u shown enlarged in FIG. That is, there is no directionality, and a voltage element is input from the analog / digital (A / D) conversion module 52 via the system bus 53, and when the voltage value falls below a preset value (within the hatched range), a detection operation is performed. To do.

リレー特性選択モジュール（手段）５７は、短絡方向継電システム５０の検出特性を系統状況等に応じて選択切替えする。すなわち、短絡方向継電システム５０の検出特性として、常時は短絡方向検出特性５４ｄを設定し、この短絡方向検出特性５４ｄにより事故検出が行われると、検出特性を過電流検出特性５５ｏに切替える。また、この過電流検出特性５５ｏが設定されている状態で、不足電圧検出特性５６ｕが不足電圧状態を検出中であれば、検出特性として過電流検出特性５５ｏを維持する。これに対し、不足電圧検出特性５６ｕが復帰すれば（不足電圧状態が解消すれば）、検出特性を短絡方向検出特性５４ｄに戻す。   The relay characteristic selection module (means) 57 selectively switches the detection characteristic of the short-circuit direction relay system 50 according to the system status or the like. That is, as the detection characteristic of the short-circuit direction relay system 50, the short-circuit direction detection characteristic 54d is normally set, and when an accident is detected by the short-circuit direction detection characteristic 54d, the detection characteristic is switched to the overcurrent detection characteristic 55o. If the undervoltage detection characteristic 56u is detecting an undervoltage state while the overcurrent detection characteristic 55o is set, the overcurrent detection characteristic 55o is maintained as the detection characteristic. On the other hand, if the undervoltage detection characteristic 56u is restored (if the undervoltage state is resolved), the detection characteristic is returned to the short-circuit direction detection characteristic 54d.

トリップ出力モジュール５８は、短絡方向モジュール５４または過電流モジュール５５が検出動作した場合、所定の時限を持って該当する遮断器（図３では受電遮断器２）に対してトリップ信号を出力する。   When the short circuit module 54 or the overcurrent module 55 detects and operates, the trip output module 58 outputs a trip signal to the corresponding circuit breaker (the power receiving circuit breaker 2 in FIG. 3) with a predetermined time limit.

次に、動作を、図２で示す事故検出特性の遷移を参照しながら説明する。上記構成において、短絡方向継電システム５０は、リレー特性選択手段５７により、常時は、事故検出特性として短絡方向検出特性５４ｄが選択されている。この状態において、図３で示した受電遮断器２より上位側である電力会社の電源１側の送電線の至近端で短絡事故が発生すると、短絡方向継電システム５０には、系統から電流要素Ｉと電圧要素Ｖとが入力され、短絡方向検出特性５４ｄはこれらの位相差と事故電流の大きさとから短絡事故を検出する。   Next, the operation will be described with reference to the transition of the accident detection characteristic shown in FIG. In the above configuration, in the short-circuit direction relay system 50, the short-circuit direction detection characteristic 54d is normally selected as the accident detection characteristic by the relay characteristic selection unit 57. In this state, when a short-circuit accident occurs at the closest end of the power transmission line on the power source 1 side of the electric power company, which is higher than the power receiving breaker 2 shown in FIG. The element I and the voltage element V are input, and the short circuit direction detection characteristic 54d detects a short circuit accident from the phase difference and the magnitude of the accident current.

短絡方向継電システム５０は、通常、時間協調を持たせているため、トリップ出力モジュール５８が直ちにトリップ信号を出力することはない。また、短絡方向検出特性５４ｂによる事故検出に伴い、リレー特性選択手段５７は、事故検出特性として、これまでの短絡方向検出特性５４ｄに代って過電流検出特性５５ｏを設定する。この過電流検出特性５５ｏの設定は、不足電圧検出特性５５ｕが不足電圧状態を検出中であれば維持される。このため、至近端事故により電圧要素Ｖが低下し、方向性の判別ができなくなっても、方向性を見ない過電流検出特性５５ｏにより、事故検出状態が継続する。   Since the short-circuit direction relay system 50 is usually time-coordinated, the trip output module 58 does not immediately output a trip signal. As the accident is detected by the short-circuit direction detection characteristic 54b, the relay characteristic selection unit 57 sets the overcurrent detection characteristic 55o as the accident detection characteristic in place of the conventional short-circuit direction detection characteristic 54d. The setting of the overcurrent detection characteristic 55o is maintained if the undervoltage detection characteristic 55u is detecting an undervoltage state. For this reason, even if the voltage element V decreases due to a near-end accident and the directionality cannot be determined, the accident detection state continues due to the overcurrent detection characteristic 55o that does not look at the directionality.

そして、時間協調による所定の時限タイマーがカウントアップすると、トリップ出力モジュール５８は該当する遮断器２にトリップ指令を出力し、受電遮断器２を遮断動作させて、この受電遮断器２より下位の連系系統を、事故点を有する上位の送電線から切り離す。この動作により、短絡方向継電システム５０は事故点から切り離されるため、その事故検出特性は常時対応の短絡方向検出特性に復帰する。   Then, when a predetermined timed timer by time cooperation is counted up, the trip output module 58 outputs a trip command to the corresponding circuit breaker 2 to cause the power receiving circuit breaker 2 to perform a shut-off operation. Disconnect the grid from the upper transmission line with the accident point. By this operation, the short-circuit direction relay system 50 is disconnected from the accident point, so that the accident detection characteristic returns to the always-supported short-circuit direction detection characteristic.

一方、図３で示した受電遮断器２より上位側である電力会社の電源１側の送電線で瞬時電圧低下が発生した場合は、図３で示した連係中の自家発電設備８から受電遮断器２を通って送電線に電流が流出する。このとき、短絡方向検出継電システム５０の事故検出特性は短絡方向検出特性５４ｄであるが、送電線での瞬時電圧低下により送電線に流出する電流の方向は、送電線で短絡事故が生じた場合と同じであるため、短絡方向検出特性５４ｄの電流整定値によっては、短絡方向検出特性５４ｄが動作する。   On the other hand, when an instantaneous voltage drop occurs in the power transmission line on the power source 1 side of the electric power company that is higher than the power receiving breaker 2 shown in FIG. 3, the power receiving is cut off from the linked private power generation facility 8 shown in FIG. A current flows out to the transmission line through the device 2. At this time, the fault detection characteristic of the short-circuit direction detection relay system 50 is the short-circuit direction detection characteristic 54d, but the direction of the current flowing out to the transmission line due to the instantaneous voltage drop in the transmission line is a short-circuit accident in the transmission line. Since this is the same as the case, the short-circuit direction detection characteristic 54d operates depending on the current set value of the short-circuit direction detection characteristic 54d.

この動作により、短絡方向検出継電システム５０の事故検出特性は過電流検出特性５５ｏに変化する。短絡方向継電システム５０は、前述のように時限を持たせているので、限時タイマーがカウントアップしきる前に、送電線で瞬時電圧低下が回復すると、今度は送電線側から受電遮断器２を通って負荷電流が流入する。このとき事故検出特性は、方向性を見ない過電流検出特性５５ｏになっているため、負荷電流の方向は判断されず、この負荷電流が、過電流検出特性５５ｏの電流整定値より大きい場合には、事故検出状態が継続する。   By this operation, the accident detection characteristic of the short-circuit direction detection relay system 50 changes to the overcurrent detection characteristic 55o. Since the short-circuit direction relay system 50 has a time limit as described above, if the instantaneous voltage drop recovers before the time limit timer counts up, the incoming circuit breaker 2 is connected from the power transmission line side this time. Load current flows through. At this time, since the accident detection characteristic is the overcurrent detection characteristic 55o that does not show directionality, the direction of the load current is not determined, and this load current is larger than the current set value of the overcurrent detection characteristic 55o. The accident detection state continues.

しかし、この時点で、送電線の瞬時電圧低下は回復しているので、不足電圧検出特性５６ｕは動作復帰している。このため、リレー特性選択手段５７は、短絡方向継電システム５０の事故検出特性を常時対応の短絡方向検出特性５４ｄに復帰させる。このとき上位の送電線から受電遮断器２を通って流れる負荷電流は、上位の送電線での事故電流に対し位相が反転しているため、短絡方向検出特性５４ｄの予め設定された動作範囲（斜線部分）に入らず、誤って事故検出することはない。   However, since the instantaneous voltage drop of the transmission line has recovered at this point, the undervoltage detection characteristic 56u has returned to operation. For this reason, the relay characteristic selection means 57 returns the accident detection characteristic of the short circuit direction relay system 50 to the always corresponding short circuit direction detection characteristic 54d. At this time, the phase of the load current flowing from the upper power transmission line through the power receiving breaker 2 is reversed with respect to the accident current in the upper power transmission line. It does not enter the shaded area) and accidents will not be detected by mistake.

このように、短絡方向継電システム５０では、システムバス５３にのせられている電流要素Ｉ、電圧要素Ｖの位相差、電流・電圧の大きさ等が整定された値以上(或いは以下)だと動作する。リレー特性選択手段５７は、短絡方向検出特性５４ｄが動作したら、事故検出特性を過電流検出特性５５ｏに変化させる。また、過電流検出特性５５ｏに切替えたのち、不足電圧検出特性５６ｕが不足電圧状態を検出していれば、継続して過電流検出特性５５ｏとし、不足電圧検出特性５６ｕが不足電圧状態を検出していなければ、事故検出特性を短絡方向検出特性５４ｄに戻す。トリップ出力モジュール５８は、過電流検出特性５５ｏによる検出状態が、ある整定時間以上継続したらトリップ指令を出力する。   As described above, in the short-circuit direction relay system 50, the phase difference between the current element I and the voltage element V placed on the system bus 53, the magnitude of the current / voltage, etc. are equal to or greater than (or less than) the set values. Operate. The relay characteristic selection unit 57 changes the accident detection characteristic to the overcurrent detection characteristic 55o when the short-circuit direction detection characteristic 54d operates. Further, after switching to the overcurrent detection characteristic 55o, if the undervoltage detection characteristic 56u detects an undervoltage state, the overcurrent detection characteristic 55o is continued, and the undervoltage detection characteristic 56u detects the undervoltage state. If not, the accident detection characteristic is returned to the short-circuit direction detection characteristic 54d. The trip output module 58 outputs a trip command when the detection state by the overcurrent detection characteristic 55o continues for a certain settling time.

これらの結果、至近端事故に対して方向判定を行って確実に検出動作し、時間協調による限時タイマーカウントアップ中も動作継続して事故点を確実に切り離せると共に、上位側に瞬時電圧低下が生じ、これが限時タイマーのカウントアップ以前に回復しても、従来のように過電流検出特性のままになってしまうことなく、確実に短絡方向検出特性に復帰させることができ、所定の保護継電機能を実行することができる。   As a result, it is possible to detect the direction by detecting the direction of the near-end accident and to reliably detect the accident. If this occurs before the time-up timer counts up, the overcurrent detection characteristic does not remain as in the conventional case, but it can be reliably restored to the short-circuit direction detection characteristic, and the predetermined protection Electric functions can be executed.

なお、上記実施の形態では、不足電圧検出特性５６ｕとして、内蔵モジュールの特性を用いたが、外部に設けた不足電圧計電器を用い、その検出結果を入力するようにしてもよい。   In the above embodiment, the characteristics of the built-in module are used as the undervoltage detection characteristics 56u. However, an undervoltage meter provided outside may be used to input the detection result.

本発明による短絡方向継電システムの一実施の形態を示すブロック図である。It is a block diagram which shows one Embodiment of the short circuit direction relay system by this invention. 同上一実施の形態における事故検出特性の遷移を表す図である。It is a figure showing the transition of the accident detection characteristic in one Embodiment same as the above. 一般的な自家発電設備を有する連係系統を示す単線系統図である。It is a single track | line system figure which shows the linkage system which has a general private power generation equipment. 従来の短絡方向継電器の事故検出特性の遷移を表す図である。It is a figure showing the transition of the accident detection characteristic of the conventional short circuit direction relay. 従来の短絡方向継電器の構成の一部を示すブロック図である。It is a block diagram which shows a part of structure of the conventional short circuit direction relay.

符号の説明Explanation of symbols

１ 電力会社の電源
２ 受電遮断器
５０ 短絡方向継電システム
５４ｄ 短絡方向検出手段
５５ｏ 過電流検出手段
５６ｕ 不足電圧検出手段
５７ リレー特性選択手段 DESCRIPTION OF SYMBOLS 1 Power source of electric power company 2 Power receiving breaker 50 Short circuit direction relay system 54d Short circuit direction detection means 55o Overcurrent detection means 56u Undervoltage detection means 57 Relay characteristic selection means

Claims (1)

保護対象系統から電流要素と電圧要素を入力し、これらの位相差及び電流値の大きさから、短絡事故が生じた位置を判定し、動作する短絡方向継電システムであって、
前記位相差に基づく動作方向が予め設定された動作範囲に入り、かつ電流値が予め設定した値以上になると検出動作する短絡方向検出手段と、
前記電流値が予め設定した値以上になると検出動作する過電流検出手段と、
前記電圧値が予め設定した値以下になると検出動作する不足電圧検出手段と、
常時は前記電流要素及び電圧要素に応動する事故検出手段として短絡方向検出手段を設定し、この短絡方向検出手段が動作すると、事故検出手段を前記過電流検出手段に切替え、この過電流検出手段が設定されている状態で、前記不足電圧検出手段が動作中であれば過電流検出手段を維持し、不足電圧検出手段が復帰すれば事故検出手段を前記短絡方向検出手段に戻すリレー特性選択手段と、
を備えたことを特徴とする短絡方向継電システム。 A short-circuit direction relay system that operates by inputting a current element and a voltage element from a protection target system, determining a position where a short-circuit accident has occurred, from the phase difference and the magnitude of the current value,
A short-circuit direction detecting means that performs a detection operation when the operation direction based on the phase difference enters a preset operation range and the current value is equal to or greater than a preset value;
Overcurrent detection means that performs a detection operation when the current value exceeds a preset value;
An undervoltage detection means that performs a detection operation when the voltage value is equal to or lower than a preset value;
Normally, a short-circuit direction detection means is set as an accident detection means that responds to the current element and voltage element, and when this short-circuit direction detection means operates, the accident detection means is switched to the overcurrent detection means. A relay characteristic selection unit that maintains the overcurrent detection unit if the undervoltage detection unit is operating in the set state, and returns the accident detection unit to the short-circuit direction detection unit when the undervoltage detection unit returns. ,
A short-circuit direction relay system characterized by comprising:
JP2004180798A 2004-06-18 2004-06-18 Short-circuit direction relay system Pending JP2006006044A (en)

Priority Applications (1)

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JP2004180798A JP2006006044A (en) 2004-06-18 2004-06-18 Short-circuit direction relay system

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JP2004180798A JP2006006044A (en) 2004-06-18 2004-06-18 Short-circuit direction relay system

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