JP4786436B2 - Ground fault monitoring device and ground fault monitoring method - Google Patents
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本発明は配電系統人工地絡試験中に発生する実際の地絡事故を検出して、迅速な事故復旧処置を可能にする地絡監視装置および地絡監視方法に関する。 The present invention relates to a ground fault monitoring apparatus and a ground fault monitoring method that detect an actual ground fault occurring during a power distribution system artificial ground fault test and enable a quick accident recovery procedure.
従来、地絡を高精度で迅速に検出する技術が提案されている。たとえば、特許文献１には、保護範囲外の地絡に影響されないで、微地絡を含む地絡電流を精度高く演算する手法が提案されている。特許文献２には、高圧電源系統に設置した全地絡継電器および全地絡方向継電器において地絡検出時に出力される動作信号の状態から、迅速に地絡発生とその区域特定をして運転員に報知する高圧電源系統の地絡監視装置が記載されている。また、特許文献３には、人工地絡試験によって測定した数値を用いて少ない係数で精度の高い地絡監視を実施する技術が提案されている。 Conventionally, a technique for quickly detecting a ground fault with high accuracy has been proposed. For example, Patent Document 1 proposes a technique for calculating a ground fault current including a fine ground fault with high accuracy without being affected by a ground fault outside the protection range. According to Patent Document 2, an operator can quickly identify the occurrence of a ground fault and identify the area from the state of the operation signal output when detecting a ground fault in all ground fault relays and all ground fault direction relays installed in the high-voltage power system. Is a ground fault monitoring device for a high-voltage power supply system. Patent Document 3 proposes a technique for performing high-accuracy ground fault monitoring with a small number of coefficients using numerical values measured by an artificial ground fault test.
ところで、人工地絡試験中に実際の地絡事故（以下、実地絡事故という。）が発生した場合は、これまでＧＰＴ３次に電圧計または地絡過電圧継電器を接続して、異常電圧が発生しているか否かを監視したり、または継電器動作時に、試験（人工接地）による地絡電圧発生か否かを作業員に確認したり、配電盤表示などを含めて総合的に試験による地絡なのか実地絡なのかを判断していた。 By the way, when an actual ground fault accident (hereinafter referred to as an actual ground fault accident) occurs during an artificial ground fault test, an abnormal voltage has been generated by connecting a voltmeter or a ground fault overvoltage relay next to GPT3. Whether the ground fault voltage is generated by the test (artificial grounding) when the relay is in operation, or is the ground fault by the test comprehensively including the switchboard display, etc. Judging whether it was a real fault.
しかしながら、測定を自動で実施する新型の人工地絡試験装置が導入されると、試験作業員であっても、その新型人工地絡試験装置が動作したことによる地絡なのか否かを迅速に判断するのは困難になってきている。このため配電系統の実地絡故障発生時に迅速な遮断ができず、顧客への影響、配電系統、変電所設備の故障が懸念されている。 However, when a new artificial ground fault testing device that automatically performs measurement is introduced, even a test worker can quickly determine whether or not the ground fault is due to the operation of the new artificial ground fault testing device. It is becoming difficult to judge. For this reason, when an actual ground fault occurs in the power distribution system, it cannot be quickly shut down, and there are concerns about the impact on customers and the failure of the power distribution system and substation equipment.
また、試験時は配電盤警報表示が多発するが、試験場所は警報表示から離れていることが多く、警報の確認・停止のための現場対応要員の増加に繋がっている。
本発明は上述のかかる事情に鑑みてなされたものであり、少ない現場対応要員で監視が可能であり、人工地絡試験中に発生する実地絡事故を迅速かつ的確に検出して、該当する遮断機の手動トリップに繋げることのできる地絡監視装置および地絡監視方法を提供することを目的とする。 The present invention has been made in view of the above-described circumstances, and can be monitored by a small number of on-site personnel, and can detect a real ground fault accident that occurs during an artificial ground fault test quickly and accurately, and can perform appropriate blocking. An object of the present invention is to provide a ground fault monitoring device and a ground fault monitoring method that can be connected to a manual trip of a machine.
上記目的を達成するため、本発明に係わる地絡監視装置は、地絡試験のための模擬地絡信号を取り込み表示する警報入力・表示手段と、配電系統に接続されたＧＰＴの出力信号を取り込み、該出力信号が所定値以上になると動作する地絡過電圧検出手段と、一または二以上のフィーダーの地絡方向継電器の動作状態を取り込み該動作状態を表示するフィーダーＤＧ動作状態入力手段と、地絡過電圧検出手段によって地絡過電圧の検出があり、かつ、いずれかのフィーダーの地絡方向継電器が動作したときに実地絡検出表示をする実地絡検出手段と、を備えたことを特徴とする。 In order to achieve the above object, a ground fault monitoring apparatus according to the present invention captures an alarm input / display means for capturing and displaying a simulated ground fault signal for a ground fault test, and captures an output signal of a GPT connected to a distribution system. A ground fault overvoltage detecting means that operates when the output signal exceeds a predetermined value, a feeder DG operation state input means for taking in an operation state of one or more feeder ground fault direction relays and displaying the operation state; There is provided a ground fault detecting means for detecting a ground fault when the ground fault over voltage is detected by the fault over voltage detecting means and when the ground fault direction relay of any feeder is operated.
本発明では、地絡監視装置にＧＰＴの出力信号として、たとえばＧＰＴ３次の電圧信号を取り込み、この電圧信号を予め設定された所定値と比較して、所定値以上になった場合は、地絡過電圧検出信号を出力する。そして、この地絡過電圧検出信号が出力され、かつ、いずれかのフィーダーの地絡方向継電器が動作したときに実際に地絡事故が発生したことを知らせるための実地絡検出表示をする。これによって、人工地絡試験中の実地絡事故を検出して遮断器の手断操作等の処置に繋がることができる。 In the present invention, a GPT tertiary voltage signal, for example, is taken into the ground fault monitoring device as a GPT output signal, and this voltage signal is compared with a predetermined value set in advance. Outputs an overvoltage detection signal. Then, when this ground fault overvoltage detection signal is output and the ground fault direction relay of one of the feeders is operated, an actual ground fault detection display is displayed to notify that a ground fault has actually occurred. As a result, an actual ground fault accident during the artificial ground fault test can be detected, which can lead to measures such as a manual breaker operation.
本発明に係わる地絡監視装置は、さらに、地絡過電圧検出手段の所定値を設定するための整定値設定手段を備えたことを特徴とする。 The ground fault monitoring apparatus according to the present invention is further characterized by further comprising a settling value setting means for setting a predetermined value of the ground fault overvoltage detection means.
本発明では、ＧＰＴの出力信号が通常の負荷変動によって変化するため、過電圧検知のスレッシュホールドを設定可能にする。 In the present invention, since the output signal of the GPT changes due to a normal load fluctuation, the threshold for overvoltage detection can be set.
また、本発明に係わる地絡監視装置は、さらに、警報入力・表示手段は、種別ごとに警報信号を取り込んで表示することを特徴とする。 The ground fault monitoring apparatus according to the present invention is further characterized in that the alarm input / display means captures and displays an alarm signal for each type.
好ましくは、この地絡監視装置に警報信号に対する警報停止および表示復帰信号を出力する手段を備えるようにすると良い。これによって、地絡監視装置から警報信号に対する対処が可能となり、現場対応要員の削減を図ることができる。 Preferably, the ground fault monitoring device is provided with means for outputting an alarm stop and display return signal for the alarm signal. As a result, it is possible to cope with the alarm signal from the ground fault monitoring device, and it is possible to reduce the number of on-site personnel.
また、警報信号の入出力用の電源と、地絡監視装置の動作用電源は異なる電圧にすると良い。単に電源系統を変えるのみで無く、電源電圧を変えることによって、電源の回りこみによる誤遮断等の誤動作を防止することができる。 Moreover, it is preferable that the power supply for input / output of the alarm signal and the power supply for operation of the ground fault monitoring device have different voltages. Not only changing the power supply system but also changing the power supply voltage can prevent malfunctions such as erroneous shut-off due to power wraparound.
本発明に係わる地絡監視方法は、上記の地絡監視装置を用いて人工地絡試験中に発生する実地絡の発生を監視する方法であって、地絡監視装置の警報手段から人工地絡試験中に地絡事故発生の警報鳴動があった場合は、実地絡検出手段によって出力される実地絡検出表示の有無によって実地絡発生を確認すると共に実地絡検出表示があった場合は、次にフィーダーＤＧ動作状態入力手段の表示によって各配電線の地絡方向継電器の動作状態を確認し、いずれかの地絡方向継電器が動作している場合は、人工地絡試験を中断して該当フィーダーを手断することを特徴とする。 A ground fault monitoring method according to the present invention is a method of monitoring the occurrence of an actual ground fault occurring during an artificial ground fault test using the above ground fault monitoring apparatus, and comprising an artificial ground fault from an alarm means of the ground fault monitoring apparatus. If there is an alarm sound of the occurrence of a ground fault during the test, confirm the occurrence of the actual ground fault by the presence or absence of the actual ground fault detection display output by the actual ground fault detection means, and if there is an actual ground fault detection display, Check the operation status of the ground fault direction relay of each distribution line by displaying the feeder DG operation status input means, and if any ground fault direction relay is operating, interrupt the artificial ground fault test and It is characterized by hand cutting.
本発明では、地絡監視装置の表示に従って所定の手順で確認、操作を行うことによって、人工地絡試験中の実地絡事故を的確に把握することができ、事故発生時には迅速に該当する遮断器を手断することができる。 In the present invention, it is possible to accurately grasp an actual ground fault accident during an artificial ground fault test by performing confirmation and operation according to a predetermined procedure in accordance with the display of the ground fault monitoring device, and when the accident occurs, the corresponding circuit breaker can be quickly found. Can be cut off.
本発明によれば、地絡監視装置に情報を集約させることによって少ない現場対応要員で監視が可能となり、また人工地絡試験中に発生する実地絡事故の迅速かつ的確な検出が可能となる。 According to the present invention, by collecting information in the ground fault monitoring device, it is possible to monitor with a small number of on-site personnel, and it is possible to quickly and accurately detect an actual ground fault accident that occurs during an artificial ground fault test.
以下、本発明の実施の形態を説明する。図１は、第１の実施の形態による地絡監視装置の機能ブロック図である。 Embodiments of the present invention will be described below. FIG. 1 is a functional block diagram of the ground fault monitoring apparatus according to the first embodiment.
この図で、地絡監視装置１は、本装置を動作させるための電源部１１、電源の入／切状態を表示する電源表示手段１２、配電系統に接続されたＧＰＴの出力信号を取り込み、この出力信号が所定値以上になると動作する地絡過電圧検出手段１３、地絡過電圧検出手段１３の動作する閾値を設定する整定値設定手段１４、フィーダーの地絡方向継電器の動作状態を取り込み、この動作状態を表示するフィーダーＤＧ動作状態入力手段１５、取り込んだ種々の信号をもとに実地絡の発生の有無を判定する実地絡検出手段１６、地絡試験のための模擬地絡信号を取り込んで表示する警報入力・表示手段１７、地絡を検出したときに警報信号を出力する警報手段１８、配電盤の警報を停止するための信号を出力する配電盤警報停止手段１９から構成されている。
In this figure, a ground fault monitoring device 1 takes in a
図２は、上記の各手段に対応する回路の一例を記載している。この図において、地絡過電圧検出手段１３は、ボルテージセンサー２１からの電線をＧＰＴ３次ＰＴＴ下側プラグ下に接続し、入力した電圧と整定値設定手段１４で設定した整定値とを比較し、整定値以上の電圧Ｖ０を検出するとボルテージセンサー２１の接点２２がクローズし、ＯＶＧリレー２３が動作する。これによってＢＺ（ブザー）２４から警報が出力される。
FIG. 2 shows an example of a circuit corresponding to each of the above means. In this figure, the ground fault overvoltage detection means 13 connects the electric wire from the voltage sensor 21 under the lower plug of the GPT tertiary PTT, compares the input voltage with the set value set by the set value setting means 14, and setstling. When a voltage V0 greater than the value is detected, the contact 22 of the voltage sensor 21 is closed and the
一方、配電盤からフィーダーＤＧ動作状態入力手段１５にフィーダーＤＧ動作状態信号（地絡方向継電器の動作信号）が入力されると、フィーダーごとに対応するＬＥＤ８〜１３のいずれかが点灯する。また、実地絡検出手段１６では、ＯＶＧリレー２３の接点がクローズすることによってＬＥＤ２が点灯する。また、ＯＶＧリレー２３の接点がクローズし、かつ、いずれかのフィーダーの地絡方向継電器の動作信号が入力されることによって、実地絡の検出表示であるＬＥＤ３が点灯するようになっている。
On the other hand, when a feeder DG operation state signal (an operation signal of the ground fault direction relay) is input from the switchboard to the feeder DG operation state input means 15, any of the LEDs 8 to 13 corresponding to each feeder is turned on. In the actual ground fault detection means 16, the LED 2 is turned on when the contact of the
また、警報入力・表示手段１７には、人工地絡試験装置からの模擬地絡信号（ＯＶＧ表示）が入力される。また、配電盤警報パルスとして電気所故障表示盤ベル警報パルス（ＢＬＢ）、電気所故障表示盤ブザー警報パルスＢＺＢ、電気所故障表示盤チャイム警報パルスＣＨＢが入力される。 The alarm input / display means 17 receives a simulated ground fault signal (OVG display) from the artificial ground fault testing apparatus. In addition, an electric station failure display panel bell alarm pulse (BLB), an electric station failure display panel buzzer alarm pulse BZB, and an electric station failure display panel chime alarm pulse CHB are input as the distribution panel alarm pulses.
配電盤警報停止手段１９では、ボタンの押下によって故障表示盤等の故障警報を出力している装置への警報停止、表示復帰信号が出力されるようになっている。図３に地絡監視装置１の外観を示す。押しボタンスイッチ、ＬＥＤ、計器、端子等を装置上部に配置している。 The switchboard alarm stop means 19 is configured to output an alarm stop / display return signal to a device that outputs a fault alarm such as a fault display panel by pressing a button. FIG. 3 shows the appearance of the ground fault monitoring device 1. Push button switches, LEDs, instruments, terminals, etc. are arranged at the top of the device.
次に、この地絡監視装置１を用いて地絡を監視する手順について、図４を用いて説明する。地絡監視装置１の警報手段１８から警報鳴動があると、まず、配電盤のＯＶＧ表示の有無（ＬＥＤ４の点灯状態）を確認する（Ｓ１０１）。そして、ＯＶＧ表示が無い場合であって、配電盤ＢＬ警報発生、配電盤ＣＨ警報発生表示があれば、すなわち、ＬＥＤ５〜７のいずれかが点灯しておれば（Ｓ１０２）、電気所故障発生として人工地絡試験を中断して故障点探索をする（Ｓ１０３）。 Next, a procedure for monitoring a ground fault using the ground fault monitoring apparatus 1 will be described with reference to FIG. When an alarm is sounded from the alarm means 18 of the ground fault monitoring device 1, first, the presence / absence of OVG display on the switchboard (the lighting state of the LED 4) is confirmed (S101). Then, if there is no OVG display, and if there is a switchboard BL alarm occurrence and switchboard CH alarm occurrence display, that is, if any of the LEDs 5 to 7 is lit (S102), then an artificial ground is detected as an electrical station failure. The fault test is interrupted and a fault point search is performed (S103).
ステップＳ１０１で配電盤のＯＶＧ表示が有れば、次に「地絡発生」表示（ＬＥＤ２）の有無を確認する（Ｓ１０４）。そして、「地絡発生」表示が無ければ（Ｓ１０４で「ＮＯ」）、「配電盤ＢＺ警報発生」表示（ＬＥＤ６）の有無を調べ（Ｓ１０５）、ＢＺ警報発生表示があれば（Ｓ１０５で「ＹＥＳ」）、人工地絡試験による警報として（Ｓ１０６）、「配電盤警報停止」、「配電盤表示復帰」のボタンを押下して警報・表示の復帰処置を行う（Ｓ１０７）。ステップＳ１０５で、「ＮＯ」の場合は、ステップＳ１０２以降の手順を実行する。 If there is an OVG display on the switchboard in step S101, then the presence / absence of a “ground fault occurrence” display (LED2) is checked (S104). If there is no “earth fault occurrence” display (“NO” in S104), the presence / absence of “switchboard BZ alarm generation” display (LED6) is checked (S105), and if there is a BZ alarm generation display (“YES” in S105). ) As an alarm by the artificial ground fault test (S106), the "Distribution board alarm stop" and "Distribution panel display return" buttons are pressed to perform the alarm / display recovery procedure (S107). If “NO” in the step S105, the procedure after the step S102 is executed.
一方、ステップＳ１０４で「ＹＥＳ」の場合は、フィーダーＤＧ動作状態として、各配電線の地絡方向継電器の動作状態を調べる（Ｓ１０８）。いずれかの地絡方向継電器が動作している場合、すなわち、ＬＥＤ８〜１３のいずれかが点灯している場合は（Ｓ１０８で「ＹＥＳ」）、「実地絡故障」表示（ＬＥＤ３）が点灯し（Ｓ１１１）、このとき人工地絡試験を中断して、スイッチギアにて該当配電線を手断する（Ｓ１１２）。一方、ステップＳ１０８で「ＮＯ」の場合は、配電系統「微地絡」として（Ｓ１０９）、人工地絡試験を中断して、スイッチギアにて地絡方向継電器の動作状態に基いて配電線を順次手断する。 On the other hand, if “YES” in the step S104, the operation state of the ground fault direction relay of each distribution line is examined as the feeder DG operation state (S108). When any of the ground fault direction relays is operating, that is, when any of the LEDs 8 to 13 is lit (“YES” in S108), the “actual ground fault” display (LED 3) is lit ( (S111) At this time, the artificial ground fault test is interrupted, and the corresponding distribution line is manually cut off by the switch gear (S112). On the other hand, if “NO” in the step S108, the distribution line “fine ground fault” is set (S109), the artificial ground fault test is interrupted, and the distribution line is switched by the switch gear based on the operating state of the ground fault direction relay. Cut through sequentially.
以上、本実施の形態によれば、地絡監視装置にＧＰＴ３次ＰＴＴの電気信号とフィーダーＤＧ動作状態信号を取り込んで実地絡監視をすると共に、配電盤の警報表示を取り込み、この表示信号と実地絡監視状態によって、人工地絡試験による地絡発生か、実地絡による地絡発生かを切り分けて対策処置を実施するので、少ない現場対応要員で監視が可能となり、また人工地絡試験中に発生する実地絡事故の迅速かつ的確な検出が可能となる。 As described above, according to the present embodiment, the ground fault monitoring device captures the electrical signal of the GPT tertiary PTT and the feeder DG operation state signal to perform the actual ground fault monitoring, captures the alarm display of the switchboard, and the display signal and the actual ground fault. Depending on the monitoring status, ground faults caused by artificial ground fault tests or ground faults caused by actual ground faults are separated and countermeasures are implemented, so monitoring is possible with a small number of on-site personnel, and they occur during artificial ground fault tests. It is possible to quickly and accurately detect an actual ground fault.
本発明は、電力系統における地絡事故の監視に利用することができる。 The present invention can be used for monitoring a ground fault in a power system.
１ 地絡監視装置
１１ 電源部
１２ 電源表示手段
１３ 地絡過電圧検出手段
１４ 整定値設定手段
１５ フィーダーＤＧ動作状態入力手段
１６ 実地絡検出手段
１７ 警報入力・表示手段
１８ 警報手段
１９ 配電盤警報停止手段
２１ ボルテージセンサー
２２ ボルテージセンサー接点
２３ ＯＶＧリレー
２４ ＢＺ（ブザー）
DESCRIPTION OF SYMBOLS 1 Ground
Claims (2)
配電系統に接続されたＧＰＴの出力信号を取り込み、該出力信号が所定値以上になると動作する地絡過電圧検出手段と、
前記地絡過電圧検出手段の前記所定値を設定するための整定値設定手段と、
二以上のフィーダーの地絡方向継電器の動作状態を取り込み、該動作状態をそれぞれ表示するフィーダーＤＧ動作状態入力手段と、
前記地絡過電圧検出手段によって地絡過電圧を検出したときに地絡発生表示を行い、地絡過電圧を検出し、かつ、二以上のフィーダーの地絡方向継電器のうちいずれかのフィーダーの地絡方向継電器が動作したときに実地絡故障表示を行なう実地絡検出手段と、
前記警報信号に対する警報停止および表示復帰信号を出力する手段と、
を備えたことを特徴とする地絡監視装置。 Alarm input / display means for taking in a simulated ground fault signal for ground fault testing and an alarm signal from the switchboard and displaying the status of each signal ;
A ground fault overvoltage detection means that takes in an output signal of a GPT connected to a power distribution system and operates when the output signal becomes a predetermined value or more;
Settling value setting means for setting the predetermined value of the ground fault overvoltage detection means;
Feeder DG operation state input means for capturing the operation state of the ground fault direction relay of two or more feeders and displaying the operation state respectively ;
It performs ground fault occurrence displayed upon detection of a ground fault over-voltage by the ground fault over-voltage detection means detects the ground fault over voltage and ground fault the direction of one of the feeder of the earth fault directional relay of two or more feeders a hands-fault detection means for performing hands-fault failure display when the relay is activated,
Means for outputting an alarm stop and display return signal for the alarm signal;
A ground fault monitoring device characterized by comprising:
前記地絡監視装置の警報手段から人工地絡試験中に地絡事故発生の警報鳴動があった場合は、前記実地絡検出手段によって出力される地絡発生表示の有無によって地絡発生の確認を行い、この地絡発生の確認の結果、地絡発生表示が無く、前記配電盤からの警報信号の表示があった場合は、人工地絡試験による警報と判定して該警報信号に対する警報停止および表示復帰を行い、前記地絡発生の確認の結果、地絡発生表示があった場合は、次に前記フィーダーＤＧ動作状態入力手段の表示によって各配電線の地絡方向継電器の動作状態を確認し、いずれかの地絡方向継電器が動作している場合は、人工地絡試験を中断して該当フィーダーを手断する一方、いずれの地絡方向継電器も動作していない場合は、配電系統微地絡と判定して、人工地絡試験を中断してフィーダーを順次手断することを特徴とする地絡監視方法。 A method for monitoring the occurrence of an actual ground fault occurring during an artificial ground fault test using the ground fault monitoring device according to claim 1 ,
If there is an alarm ringing of the ground fault occurs in artificial ground fault test from the alarm means of the ground絡監vision device, the confirmation of the earth絡発raw by the presence or absence of the earth絡発raw display output by the hands fault detection means As a result of confirming the occurrence of the ground fault, if there is no ground fault occurrence display and an alarm signal is displayed from the switchboard, it is determined that the alarm is due to the artificial ground fault test, and the alarm is stopped and displayed for the alarm signal. and to recover the land絡発raw confirmation result, when there is land絡発raw display, then check the operation status of the earth fault directional relay of each distribution line by a display of the feeder DG operating state input means, If any of the ground fault direction relays is operating, interrupt the artificial ground fault test and cut off the corresponding feeder, while if any of the ground fault direction relays are not operating, It is judged that the artificial ground Earth絡監vision method characterized by sequentially Tedan feeder interrupt the test.
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