JP3097030B2 - Apparatus for detecting the soundness / unhealthyness of the power supply system in private power generation facilities - Google Patents
Apparatus for detecting the soundness / unhealthyness of the power supply system in private power generation facilitiesInfo
- Publication number
- JP3097030B2 JP3097030B2 JP09199496A JP19949697A JP3097030B2 JP 3097030 B2 JP3097030 B2 JP 3097030B2 JP 09199496 A JP09199496 A JP 09199496A JP 19949697 A JP19949697 A JP 19949697A JP 3097030 B2 JP3097030 B2 JP 3097030B2
- Authority
- JP
- Japan
- Prior art keywords
- private
- power supply
- power
- generator
- supply side
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Description
【０００１】[0001]
【発明の属する技術分野】本発明は電力需要家に設備さ
れた自家用発電設備における電力供給側系統の健全・不
健全を検出する装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting whether a power supply system is sound or unhealthy in a private power generation facility installed in a power consumer.
【０００２】[0002]
【従来の技術】近年、電力を大量に消費する需要家にお
いては、所内の電力消費を節約し、また非常停電等の発
生時に所内に電力を供給するために自家用発電機を設置
し、電力会社から一定の電力の供給を受けながら、自家
用発電機で発生した安価な電力を所内の自家用負荷に供
給する自家用発電設備が盛んに設置されつつある。この
自家用発電設備と、電力会社の電力供給側系統は、「系
統連系技術用件ガイドライン」に添って安全を維持する
ための必要な対策が設けられ、自家用発電設備内故障や
電力供給側故障等の発生時には各種の保護装置により負
荷側の機器類の損失を防止し、早急な故障回復に務めて
いる。2. Description of the Related Art In recent years, consumers who consume large amounts of electric power have installed private power generators in order to save electric power in the office and to supply electric power to the office when an emergency power failure or the like occurs. Private power generation facilities for supplying inexpensive power generated by a private power generator to a private load in a facility while receiving a constant supply of power from a private power generator are being actively installed. The private power generation equipment and the power supply system of the power company are provided with necessary measures to maintain safety in accordance with the “Guidelines for System Interconnection Technology”, and failures in the private power generation equipment and power supply side In the event of a failure or the like, various protection devices prevent the loss of equipment on the load side, and are working to quickly recover from a failure.
【０００３】しかし、近年、電力供給側において、新エ
ネルギー等分散型電源から余剰電力を積極的に購入する
ように法規が改正され、自家用発電設備においても一定
の条件のもとで電力供給側への連系に応じて余剰電力の
販売が可能となり、逆潮流防止装置を装備する必要がな
くなりつつある。しかしながら、自家用発電機の余剰電
力を電力供給側に供給できるように逆潮流が許容された
設備において、電力供給側が健全であるか、不健全であ
るか、即ち、電力会社の発電所側の遮断器が閉路されて
いるか否か、或いは電線路が切断されているか否かを自
家用発電設備側で検出することができず、例えば電線路
の故障等により電力供給側の各遮断器が開路した状態で
自家用発電設備側の連系遮断器が閉路していると、電力
供給側の故障した電線路に自家用発電機の電圧が印加さ
れて電線路の保守点検、復旧作業等が危険となる。However, in recent years, laws and regulations have been amended on the power supply side to actively purchase surplus power from distributed power sources such as new energy, and even private power generation facilities have been changed to the power supply side under certain conditions. It is now possible to sell surplus power in accordance with the interconnection of these systems, and it is no longer necessary to equip reverse flow prevention devices. However, in facilities where reverse power flow is allowed so that the surplus power of the private generator can be supplied to the power supply side, whether the power supply side is sound or unhealthy, that is, shutting off the power plant side of the power company The state in which each of the circuit breakers on the power supply side is open due to a failure in the power line, for example, cannot detect whether the circuit breaker is closed or the power line is disconnected. If the interconnecting circuit breaker on the side of the private power generation facility is closed, the voltage of the private generator is applied to the failed electric line on the power supply side, and maintenance and inspection of the electric line and restoration work may be dangerous.
【０００４】また、電力供給側の故障回復後にその発電
所側の遮断器を閉路して電力を供給するときに、自家用
発電設備側の連系遮断器が閉路していると、周波数、位
相、電圧等の不一致で自家用発電機が脱調、破壊される
危険があり、電力供給側より電力を供給できない等の問
題があった。そこで、電力供給側の不健全状態で自家用
発電設備側の連系遮断器を正確に開路して各種事故の発
生を防止できるようにするために、電力供給側に連系さ
れた自家用発電設備側から電力供給側が健全であるか、
不健全であるかを容易に検出できる装置が要望されてい
る。In addition, when the power supply side recovers from the failure and closes the circuit breaker on the power plant side to supply power, if the interconnection circuit breaker on the private power generation facility side is closed, the frequency, phase, There is a danger that the private generator may step out or be destroyed due to a mismatch in voltage or the like, and there is a problem that power cannot be supplied from the power supply side. Therefore, in order to prevent the occurrence of various accidents by accurately opening the circuit breaker on the private power generator side in the unhealthy state on the power supply side, the private power generator side connected to the power supply side From the power supply side is healthy,
There is a need for a device that can easily detect whether or not the device is unhealthy.
【０００５】[0005]
【発明が解決しようとする課題】本発明は上記問題点に
鑑みなされたもので、電力供給側に連系された自家用発
電設備側から電力供給側が健全であるか、不健全である
かを容易に検出でき、電力供給側の不健全状態で自家用
発電設備の連系遮断器を正確に開路して各種事故の発生
を防止できる自家用発電設備における電力供給側系統の
健全・不健全を検出する装置を提供することを目的とす
る。SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is easy to determine whether the power supply side is sound or unhealthy from the private power generation equipment connected to the power supply side. A device that detects the soundness or unhealthyness of the power supply side system in a private power generation facility that can accurately open the interconnection breaker of the private power generation facility in the unhealthy state of the power supply side and prevent the occurrence of various accidents The purpose is to provide.
【０００６】[0006]
【課題を解決するための手段】本発明の請求項１に係る
自家用発電設備における電力供給側系統の健全・不健全
を検出する装置は、電力供給側の発電機に接続された電
力供給用連系遮断器と、電力供給用連系遮断器に分岐線
を介して接続された自家用発電機と、分岐線に設けられ
た自家用連系遮断器と、自家用発電機から主として電力
を供給される自家用負荷とを備えた自家用発電設備であ
って、この自家用発電設備は、分岐線の自家用発電機側
に接続された検出用インピーダンス負荷部と、分岐線と
検出用インピーダンス負荷部との間に設けられ、少なく
とも２回以上周期的にオン・オフするスイッチと、分岐
線における電圧を検出する電圧検出部と、自家用発電設
備が連係されている場合における最初のスイッチのオン
時と次のスイッチのオン時にそれぞれ電圧検出部が検出
した電圧ドロップの波形を表示する波形表示部とを備え
るようにしたものである。また、本発明の請求項２に係
る自家用発電設備における電力供給側系統の健全・不健
全を検出する装置は、電力供給側の発電機に接続された
電力供給用連系遮断器と、電力供給用連系遮断器に分岐
線を介して接続された自家用発電機と、分岐線に設けら
れた自家用連系遮断器と、自家用発電機から主として電
力を供給される自家用負荷とを備えた自家用発電設備で
あって、この自家用発電設備は、分岐線の自家用発電機
側に接続された検出用インピーダンス負荷部と、分岐線
と検出用インピーダンス負荷部との間に設けられ、少な
くとも２回以上周期的にオン・オフするスイッチと、分
岐線における電圧を検出する電圧検出部と、自家用発電
設備が連係されている場合における最初のスイッチのオ
ン時の後のオフ時と次のスイッチのオン時の後のオフ時
にそれぞれ電圧検出部が検出したサージ電圧の波形を表
示する波形表示部とを備えるようにしたものである。さ
らに、本発明の請求項３に係る自家用発電設備における
電力供給側系統の健全・不健全を検出する装置における
電力供給側の発電機及び自家用発電機が直流発電機とす
るものである。According to the first aspect of the present invention, there is provided an apparatus for detecting the soundness / unhealthyness of a power supply side system in a private power generation facility, comprising: a power supply connection connected to a power supply side generator; System breaker, a private generator connected to the power supply interconnection breaker via a branch line, a private interconnection breaker provided on the branch line, and a private use mainly supplied with electric power from the private generator. A private power generation facility having a load, wherein the private power generation facility is provided between the branch impedance line and the detection impedance load unit, and a detection impedance load unit connected to the private line generator side of the branch line. A switch that periodically turns on and off at least twice, a voltage detection unit that detects a voltage in a branch line, and a first switch on and a next switch when a private power generation facility is linked. In which the voltage detecting unit and to and a waveform display unit that displays a waveform of the voltage drop detected respectively when on. An apparatus for detecting whether a power supply system is sound or unhealthy in a private power generation facility according to claim 2 of the present invention includes: a power supply interconnection breaker connected to a power supply-side generator; Power generator with a private generator connected to the utility circuit breaker via a branch line, a private interconnect circuit breaker provided on the branch line, and a private load mainly supplied with power from the private generator. The private power generation equipment is provided with a detection impedance load unit connected to the branch line on the private generator side, and between the branch line and the detection impedance load unit. A switch that is turned on and off, a voltage detection unit that detects a voltage in the branch line, and a switch that is turned off after the first switch is turned on and when the next switch is turned on when the private power generation equipment is linked. When off in which the voltage detecting unit each has to include a waveform display unit for displaying the waveform of the surge voltage detected. Furthermore, the generator on the power supply side and the private power generator in the device for detecting the soundness / unhealth of the power supply side system in the private power generation equipment according to claim 3 of the present invention are DC generators.
【０００７】また、本発明の請求項４に係る自家用発電
設備における電力供給側系統の健全・不健全を検出する
装置は、電力供給側の発電機に接続された電力供給用連
系遮断器と、電力供給用連系遮断器に分岐線を介して接
続された自家用発電機と、分岐線に設けられた自家用連
系遮断器と、自家用発電機から主として電力を供給され
る自家用負荷とを備えた自家用発電設備であって、この
自家用発電設備は、分岐線の自家用発電機側に接続され
た検出用インピーダンス負荷部と、分岐線と検出用イン
ピーダンス負荷部との間に設けられ、少なくとも２回以
上周期的にオン・オフするスイッチと、分岐線に流れる
電流を検出する電流検出部と、分岐線における電圧を検
出する電圧検出部と、自家用発電設備が連係されている
場合における最初のスイッチのオン時及びオフ時と次の
スイッチのオン時及びオフ時にそれぞれ電流検出部が検
出した電流の波形と電圧検出部が検出した電圧の波形と
がなす位相角を表示する波形表示部とを備えるようにし
たものである。According to a fourth aspect of the present invention, there is provided an apparatus for detecting the soundness / unhealthyness of a power supply side system in a private power generation facility, comprising a power supply interconnection breaker connected to a power supply side generator. A private generator connected to the power supply circuit breaker via a branch line, a private circuit breaker provided on the branch line, and a private load mainly supplied with power from the private generator. A private power generation facility, wherein the private power generation facility is provided between the branch impedance line and the detection impedance load portion, and is provided at least twice. A switch that is periodically turned on / off, a current detection unit that detects a current flowing through the branch line, a voltage detection unit that detects a voltage at the branch line, and a first case in which the private power generation equipment is linked. A waveform display unit for displaying a phase angle formed by a current waveform detected by the current detection unit and a voltage waveform detected by the voltage detection unit when the switch is turned on and off and when the next switch is turned on and off, respectively. It is prepared for.
【０００８】[0008]
実施の形態１ 図１は本発明の実施形態１に係る自家用発電設備におけ
る電力供給側系統の健全・不健全を検出する装置の構成
を示す単線結線図である。図において、電力供給側１０
に自家用発電設備１２が連系されている。その電力供給
側１０に電力を供給するための発電機１４に電力供給用
連系遮断器１５が接続され、この遮断器１５より電線路
１６が延長され、この電線路１６に一般負荷（図示せ
ず）等が接続される。これらの一般負荷等は内部に遮断
器や断路器等が接続されて地絡事故等が発生したときに
各負荷を電線路１６より分離して危険を防止する。Embodiment 1 FIG. 1 is a single-line diagram showing a configuration of a device for detecting the soundness / unhealthyness of a power supply side system in a private power generation facility according to Embodiment 1 of the present invention. In the figure, the power supply side 10
The private power generation equipment 12 is interconnected. An interconnection breaker 15 for power supply is connected to a generator 14 for supplying power to the power supply side 10, an electric line 16 is extended from the circuit breaker 15, and a general load (shown in FIG. Are connected. These general loads are separated from the electric line 16 to prevent danger when a circuit breaker or disconnector is connected inside and a ground fault or the like occurs.
【０００９】自家用発電設備１２は電線路１６の分岐点
Ｐ１より分岐された分岐線２０に接続された自家用連系
遮断器２１と、この連系遮断器２１に接続された自家用
発電機２２と、自家用発電機２２と分岐点Ｐ１との中間
位置の接続点Ｐ２より分岐された分岐支線２０ａに接続
されたスイッチ２３を介して接続された抵抗、コンデン
サ等の検出用インピーダンス負荷部２５とを備えて構成
されている。また、分岐線２０には接続点Ｐ２と電力供
給系統側１との間の自家用連系遮断器２１に流れる電流
を検出するための変流器のような電流検出部２７と自家
用連系遮断器２１の電圧を検出する電圧検出器２８が接
続されている。電流検出部２７と電圧検出器２８には系
統健全・不健全判定部２９が接続されている。この系統
健全・不健全判定部２９はスイッチ２３をオン、オフさ
せ、オン時とオフ時のそれぞれの電圧、電流の演算によ
ってインピーダンス、アドミッタンス、電力等の変化を
演算する計測器演算部２９ａと、計測器演算部２９ａの
演算結果から系統健全・不健全の判別する演算結果判別
部２９ｂとを有している。なお、電線路１６には上述と
同様の構成の別の他社の自家用発電設備１２が設けられ
ている。The private power generating equipment 12 includes a private interconnecting circuit breaker 21 connected to a branch line 20 branched from a branch point P1 of the power line 16, a private electrical generator 22 connected to the connecting circuit breaker 21, A detection impedance load unit 25 such as a resistor and a capacitor connected via a switch 23 connected to a branch branch line 20a branched from a connection point P2 at a position intermediate between the private generator 22 and the branch point P1. It is configured. In addition, the branch line 20 includes a current detection unit 27 such as a current transformer for detecting a current flowing in the private interconnection breaker 21 between the connection point P2 and the power supply system side 1 and a private interconnection breaker. A voltage detector 28 for detecting the voltage of the power supply 21 is connected. A system soundness / unhealth determining unit 29 is connected to the current detecting unit 27 and the voltage detector 28. The system soundness / unhealth determining unit 29 turns the switch 23 on and off, and calculates a change in impedance, admittance, power, and the like by calculating a voltage and a current when the switch 23 is on and when the switch 23 is off. A calculation result determination unit 29b for determining whether the system is sound or unhealthy from the calculation result of the measuring device calculation unit 29a. The electric power line 16 is provided with another private power generation facility 12 of another company having the same configuration as that described above.
【００１０】まず、本発明の実施の形態１の自家用発電
設備における電力供給側系統の健全・不健全を検出する
装置が電力供給側系統の健全・不健全を検出できる原理
の大略を説明する。例えば、自家用発電設備１２内の自
家用負荷が必要とする電力を自家用発電機２２を駆動し
ながら供給する。そして、自家用負荷の電力が自家用発
電機２２の出力以上に必要となったら、不足する電力が
連系遮断器２１を経由して自家用負荷へ供給され、電流
検出部２７でこの電流の流れが検出され、電圧検出部２
８でこの電圧が検出される。また、自家用負荷の負荷容
量が減少して自家用発電機２２の出力に余剰電力が発生
したら、この余剰電力は自動的に連系遮断器２１より電
力供給側へ逆潮させて余剰電力を電力供給側１０へ販売
するものである。これらの電流の流れは常時電流検出部
２７で検出しながら、電流検出部２７にの表示が零にな
ったときは、自家用発電機２２の出力と自家用負荷の負
荷容量との電力バランスが均等であるか、電力供給側１
０に故障が発生して遮断器１５が開路されているか、或
いは電線路１６が断線しているかである。First, an outline of the principle by which a device for detecting the soundness / unsoundness of the power supply side system in the private power generation equipment according to the first embodiment of the present invention can detect the soundness / unsoundness of the power supply side system will be described. For example, power required by a private load in the private power generation facility 12 is supplied while driving the private generator 22. When the power of the private load is required to be higher than the output of the private generator 22, the insufficient power is supplied to the private load via the interconnection breaker 21, and the current detection unit 27 detects the flow of this current. And the voltage detector 2
At 8 this voltage is detected. Further, when the load capacity of the private load decreases and surplus power is generated in the output of the private generator 22, the surplus power is automatically reversed from the interconnection breaker 21 to the power supply side to supply the surplus power. To sell to side 10. While the current flow is constantly detected by the current detection unit 27, when the display on the current detection unit 27 becomes zero, the power balance between the output of the private generator 22 and the load capacity of the private load is equal. Yes, power supply side 1
0 indicates that a failure has occurred and the circuit breaker 15 has been opened, or the electric line 16 has been disconnected.
【００１１】そこで、電流検出部２７と電圧検出部２８
が検出した電流と電圧に基づくアドミッタンスが電流検
出部２７が検出した電流が所定の値であるときに、スイ
ッチ２３を分岐線２０における電圧又は電流のゼロクロ
ス点を基準に一定時間前又は後、及び一定位相角の前後
に一定時間だけ周期的、不定期又は連続的にオン、オフ
させて自家用負荷に並列に接続された検出用インピーダ
ンス負荷部２５の負荷容量を周期的に１回以上変化させ
る。例えば、スイッチ２３を０．００１秒間に０．１〜
０．２秒間隔で連続的にオン、オフさせて検出用インピ
ーダンス負荷部２５の負荷容量を周期的に１回以上変化
させる。このとき、電流検出部２７と電圧検出部２８
で、電力供給側１０と自家用発電設備側１２とにより生
じる電流変化と電圧とに基づくアドミッタンス変化が検
出されなければ、電力供給側１０には故障がなく、健全
であると判断される。Therefore, the current detecting section 27 and the voltage detecting section 28
When the admittance based on the detected current and the voltage is the current detected by the current detection unit 27 is a predetermined value, the switch 23 sets the switch 23 to a predetermined time before or after a certain time based on the zero crossing point of the voltage or current in the branch line 20, and The load capacity of the detection impedance load unit 25 connected in parallel to the private load is periodically changed one or more times by turning on and off periodically, irregularly or continuously for a fixed time before and after the fixed phase angle. For example, the switch 23 is set to 0.1 to 0.001 second.
The load capacity of the detection impedance load unit 25 is periodically changed at least once by turning on and off at intervals of 0.2 seconds. At this time, the current detection unit 27 and the voltage detection unit 28
If the admittance change based on the current change and the voltage generated by the power supply side 10 and the private power generation facility side 12 is not detected, it is determined that the power supply side 10 has no failure and is sound.
【００１２】このようなアドミッタンス変化の演算は系
統健全・不健全判定部２９の計測器演算部２９ａが後述
するように行い、アドミッタンス変化に基づいて電力供
給側１０に故障がなく、健全であるか否かの判断は系統
健全・不健全検出部２９の演算結果判別部２９ｂが計測
器演算部２９ａの演算結果から行う。逆に、アドミッタ
ンス変化があれば、電力供給側１０の遮断器１５が開路
された故障状態、即ち、不健全であると判断できる。こ
の時には、連系用遮断器２１を直ちに開路させて自家用
発電設備１２側を保護する。The calculation of such an admittance change is performed by the measuring device calculation unit 29a of the system soundness / unhealth determination unit 29 as described later, and based on the admittance change, whether the power supply side 10 has no failure and is healthy. The determination as to whether or not to do so is made by the calculation result determination unit 29b of the system soundness / unhealth detection unit 29 from the calculation result of the measurement device calculation unit 29a. Conversely, if there is an admittance change, it can be determined that the circuit breaker 15 on the power supply side 10 is in a failure state in which the circuit is opened, that is, it is unhealthy. At this time, the circuit breaker 21 for interconnection is immediately opened to protect the private power generation facility 12 side.
【００１３】これによって、自家用発電機２２は連続運
転しながら設備内の自家用負荷に電力を供給でき、故障
により遮断器１５やその他の各遮断器が開路されて無負
荷状態の電線路１６に自家用発電機２２等により電力が
送電されることなく、安全に故障点検、復旧作業ができ
る。また、電線路１６の故障復旧後に直ちに電力供給側
１０の遮断器１５を閉路しても、連系遮断器２１が開路
されていれば自家用発電設備１２側の機器類が損傷する
ことなく、自家用発電機２２は電圧、周波数、位相等を
同期検定器等で電力供給側１０と正確に同期させた後で
連系遮断器２１を閉路し、連系させながら自家用発電設
備１２を電力供給側と系統連系させて通常状態に復帰さ
せるものである。もう一つの自家用発電設備を設けた場
合も同様である。Thus, the private generator 22 can supply electric power to the private load in the facility while operating continuously, and the breaker 15 and other circuit breakers are opened due to a failure, and the private generator 22 is supplied to the unloaded electric line 16. Without power being transmitted by the generator 22 or the like, failure inspection and recovery work can be performed safely. Further, even if the circuit breaker 15 on the power supply side 10 is closed immediately after the restoration of the failure of the power line 16, if the interconnecting circuit breaker 21 is open, the equipment on the side of the private power generation facility 12 is not damaged, and The generator 22, after accurately synchronizing the voltage, frequency, phase, etc. with the power supply side 10 with a synchronization verifier or the like, closes the interconnection breaker 21, and connects the private power generation equipment 12 to the power supply side while interconnecting. The system is interconnected to return to a normal state. The same applies when another private power generation facility is provided.
【００１４】次に、本発明の実施の形態１の自家用発電
設備における電力供給側系統の健全・不健全を検出する
装置が電力供給側系統の健全・不健全を検出できる原理
の詳細を説明する。 １．自家用発電設備１２が連系されている場合で、電力
供給側１０が健全な時 （１）検出用インピーダンス負荷部２５を投入しない時
の電力供給側１０の接続点９からみたインピーダンスＺ
1OFFは次式で示される。 Ｚ1OFF＝ＥOFF ／Ｉ1OFF また、このときのアドミッタンスはＹ1OFFは次式で示さ
れる。 Ｙ1OFF＝Ｉ1OFF／ＥOFF （２）スイッチ部２３を投入して検出用インピーダンス
負荷部２５に電流を流すと、検出用インピーダンス負荷
部２５を投入した時の電力供給側１０の接続点９からみ
たインピーダンスＺ1ON とアドミッタンスはＹ1ON は次
式で示される。Next, the details of the principle by which the device for detecting the soundness / unhealthyness of the power supply side system in the private power generation equipment according to the first embodiment of the present invention can detect the soundness / unhealthyness of the power supply side system will be described. . 1. When the private power generation equipment 12 is interconnected and the power supply side 10 is sound. (1) The impedance Z viewed from the connection point 9 of the power supply side 10 when the detection impedance load unit 25 is not turned on.
1OFF is expressed by the following equation. Z1OFF = EOFF / I1OFF The admittance at this time is Y1OFF expressed by the following equation. Y1OFF = I1OFF / EOFF (2) When the switch section 23 is turned on and a current flows through the detection impedance load section 25, the impedance Z1ON viewed from the connection point 9 of the power supply side 10 when the detection impedance load section 25 is turned on. And the admittance of Y1ON is given by the following equation.
【００１５】[0015]
【数１】 (Equation 1)
【００１６】ここで、ＥOFF は検出用インピーダンス負
荷部２５を投入しない時の分岐線２０における電圧、Ｉ
1OFFは検出用インピーダンス負荷部２５を投入しない時
の分岐線２０に流れる電流、ＥONは検出用インピーダン
ス負荷部２５を投入した時の分岐線２０における電圧、
Ｉ1ON は検出用インピーダンス負荷部２５を投入した時
の分岐線２０に流れる電流、Ｚ２は分岐点１からみた電
力供給側インピーダンス、Ｚ３は分岐点１からみた自家
用発電機側インピーダンス、ＩR はスイッチ部２３をＯ
Ｎした時に検出用インピーダンス負荷部２５に流れる電
流で、スイッチ部２３をＯＮした時に電力供給側から流
入する電流分Ｉk と自家用発電設備から流入する電流分
Ｉg とを合わせたものである。なお、分岐点Ｐ１と接続
点Ｐ２との間のインピーダンスは無視する。Here, EOFF is the voltage on the branch line 20 when the detecting impedance load section 25 is not turned on,
1OFF is a current flowing through the branch line 20 when the detection impedance load unit 25 is not turned on, EON is a voltage on the branch line 20 when the detection impedance load unit 25 is turned on,
I1ON is a current flowing through the branch line 20 when the detection impedance load unit 25 is turned on, Z2 is a power supply side impedance viewed from the branch point 1, Z3 is a private generator side impedance viewed from the branch point 1, and IR is a switch unit 23. O
The current Ik flowing from the power supply side when the switch unit 23 is turned on and the current Ig flowing from the private power generation equipment when the switch unit 23 is turned on. Note that the impedance between the branch point P1 and the connection point P2 is ignored.
【００１７】スイッチ部２３をＯＮすると、検出用イン
ピーダンス負荷部２５にＩR の電流が流れる。この電流
ＩR はＺ２とＺ３の比率によって分流される。従って、
検出用インピーダンス負荷部２５を投入することによっ
て、ＩR ・Ｚ３／Ｚ２＋Ｚ３だけの電流が電流検出部２
７の検出値に変化が発生する。そこで、電源供給側１０
が健全な時に検出用インピーダンス負荷部２５を投入す
ることによって、変化するインピーダンスＺ１とアドミ
ッタンスＹ１は次式で示される。When the switch section 23 is turned on, an IR current flows through the detection impedance load section 25. This current IR is divided by the ratio of Z2 and Z3. Therefore,
By inputting the detection impedance load unit 25, the current of only IR * Z3 / Z2 + Z3 is supplied to the current detection unit 2.
7, a change occurs in the detection value. Therefore, the power supply side 10
The impedance Z1 and the admittance Y1 that change when the detection impedance load unit 25 is turned on when the impedance is normal are expressed by the following equations.
【００１８】[0018]
【数２】 (Equation 2)
【００１９】２．自家用発電設備１２が連系されている
場合で、電力供給側１０の電源が喪失（停電）した不健
全な時 （１）検出用インピーダンス負荷部２５を投入しない時
の電力供給側１０のインピーダンスＺ2OFFは次式で示さ
れる。 Ｚ２OFF ＝ＥOFF ／2OFF また、このときのアドミッタンスはＹ2OFFは次式で示さ
れる。 Ｙ２OFF ＝Ｉ2OFF／ＥOFF ここで、ＥOFF は検出用インピーダンス負荷部２５を投
入しない時の分岐線２０における電圧、Ｉ1OFFは検出用
インピーダンス負荷部２５を投入しない時の分岐線２０
に流れる電流、 （２）スイッチ部２３を投入して検出用インピーダンス
負荷部２５に電流を流すと、検出用インピーダンス負荷
部２５を投入した時の電力供給側１０の接続点９からみ
たインピーダンスＺ2ON とアドミッタンスはＹ2ON は次
式で示される。2. When the private power generation equipment 12 is interconnected and the power supply side 10 loses power (power failure) and is unhealthy (1) The impedance Z2OFF of the power supply side 10 when the detection impedance load unit 25 is not turned on Is represented by the following equation. Z2OFF = EOFF / 2OFF The admittance at this time is Y2OFF expressed by the following equation. Y2OFF = I2OFF / EOFF Here, EOFF is the voltage on the branch line 20 when the detection impedance load unit 25 is not turned on, and I1OFF is the branch line 20 when the detection impedance load unit 25 is not turned on.
(2) When the switch section 23 is turned on and a current flows through the detection impedance load section 25, the impedance Z2ON viewed from the connection point 9 of the power supply side 10 when the detection impedance load section 25 is turned on is The admittance of Y2ON is given by the following equation.
【００２０】[0020]
【数３】 (Equation 3)
【００２１】ここで、Ｉ2OFFは検出用インピーダンス負
荷部２５を投入しない時の分岐線２０に流れる電流であ
る。スイッチ部２３をＯＮすると、検出用インピーダン
ス負荷部２５にＩR の電流が流れる。この電流ＩR はＺ
２とＺ３の比率によって分流される。従って、検出用イ
ンピーダンス負荷部２５を投入することによって、ＩR
・Ｚ３／Ｚ２＋Ｚ３だけの電流が電流検出部２７の検出
値に変化が発生する。そこで、電源供給側１０が不健全
な時に検出用インピーダンス負荷部２５を投入すること
によって、変化するインピーダンスＺ２とアドミッタン
スＹ２は次式で示される。Here, I2OFF is a current flowing through the branch line 20 when the detection impedance load unit 25 is not turned on. When the switch section 23 is turned on, an IR current flows through the detection impedance load section 25. This current IR is Z
The flow is divided according to the ratio of 2 to Z3. Therefore, by inputting the detection impedance load unit 25, IR
A change occurs in the detection value of the current detection unit 27 only for the current of Z3 / Z2 + Z3. Then, when the power supply side 10 is unhealthy, the impedance Z2 and the admittance Y2 that change by turning on the detection impedance load unit 25 are expressed by the following equations.
【００２２】[0022]
【数４】 (Equation 4)
【００２３】ここで、分岐点Ｐ１からみた電力供給側イ
ンピーダンスＺ２は電力供給側１０の喪失（停電）によ
って無限大となる。従って、電源供給側電源１４が異常
時に検出用インピーダンス負荷部２５を投入することに
よって、変化するインピーダンスＺ２とアドミッタンス
Ｙ２は次式で示される。Here, the power supply side impedance Z2 viewed from the branch point P1 becomes infinite due to the loss (power failure) of the power supply side 10. Therefore, the impedance Z2 and the admittance Y2 that change when the power supply-side power supply 14 turns on the detection impedance load unit 25 when an abnormality occurs are expressed by the following equations.
【００２４】[0024]
【数５】 (Equation 5)
【００２５】３．電力供給側１０が健全な場合と停電等
の不健全な場合のアドミッタンスの変化量Δについて そのアドミッタンスの変化量Δは次式で示される。3. The admittance change amount Δ when the power supply side 10 is healthy and when the power supply side is unhealthy such as a power failure is represented by the following equation.
【００２６】[0026]
【数６】 (Equation 6)
【００２７】このアドミッタンスの変化量Δを検出し、
その変化量Δがしき値を越えているか否かで電力供給側
１０が健全か不健全かの判定を行う。即ち、アドミッタ
ンスの変化量Δがしき値を越えていないときは、電力供
給側１０が健全と判定し、アドミッタンスの変化量Δが
しき値を越えているときは、電力供給側１０が不健全と
判定する。なお、電流の変化量に基づいて電力供給側が
健全か不健全かの判定を行うことができるが、アドミッ
タンスの変化量Δの方が変化が顕著に現れるので判定が
容易である。The amount of change admittance Δ is detected,
Whether the power supply side 10 is healthy or unhealthy is determined based on whether the variation Δ exceeds a threshold value. That is, when the admittance change amount Δ does not exceed the threshold value, the power supply side 10 is determined to be healthy, and when the admittance change amount Δ exceeds the threshold value, the power supply side 10 is determined to be unhealthy. judge. Although it is possible to determine whether the power supply side is healthy or unhealthy based on the amount of change in the current, it is easier to determine the admittance change amount Δ since the change appears more remarkably.
【００２８】４．複数（ｎ）台の自家用発電設備１２が
連係されている場合における電力供給側１０が健全な場
合と停電等の不健全な場合のアドミッタンスの変化量Δ
についてそのアドミッタンスの変化量Δは次式で示され
る。4. The admittance change Δ between the case where the power supply side 10 is healthy and the case where the power supply side 10 is unhealthy such as a power failure when a plurality (n) of private power generation facilities 12 are linked.
Of the admittance Δ is expressed by the following equation.
【００２９】[0029]
【数７】 このように複数台の他社の自家用発電設備１２が連係さ
れている場合についても、自社の自家用発電設備におい
て、アドミッタンスの変化量Δを検出し、その変化量Δ
がしきい値を越えていないときは電力供給側１０が健全
と判定し、その変化量Δがしきい値を越えているときに
は電力供給側１０が不健全との判定を行う。以上の数式
において、いずれの場合もＥONとＥ0ff はほぼ等しく、
系統電圧ＥONは検出用インピーダンス負荷部２５の投入
時も変化ないものとする。(Equation 7) Even in the case where a plurality of private power generation facilities 12 of other companies are linked in this way, the admittance change Δ is detected in the own power generation facility of the company, and the change Δ
Does not exceed the threshold value, the power supply side 10 is determined to be sound, and when the variation Δ exceeds the threshold value, the power supply side 10 is determined to be unhealthy. In the above equations, EON and E0ff are almost equal in each case.
It is assumed that the system voltage EON does not change even when the detection impedance load unit 25 is turned on.
【００３０】実施の形態２ 図２は本発明の実施形態１に係る自家用発電設備におけ
る電力供給側系統の健全・不健全を検出する装置の構成
を示す単線結線図である。図において、本発明の実施形
態１と同様の構成は同一符号を付して重複した構成の説
明を省略する。３０は電圧検出部２８が検出した電圧の
波形又はその電圧及び電流検出部２８が検出した電流の
波形を表示する例えばオシログラフ等の波形表示部であ
る。Embodiment 2 FIG. 2 is a single-line diagram showing a configuration of an apparatus for detecting the soundness / unhealthyness of a power supply side system in a private power generation facility according to Embodiment 1 of the present invention. In the figure, the same components as those of the first embodiment of the present invention are denoted by the same reference numerals, and the description of the duplicated components will be omitted. Reference numeral 30 denotes a waveform display unit such as an oscillograph for displaying the waveform of the voltage detected by the voltage detection unit 28 or the waveform of the voltage and the current detected by the current detection unit 28.
【００３１】この実施の形態では、自家用発電設備１２
が電力供給側１０と連係されている場合に、電力供給側
１２の分岐線２０と検出用インピーダンス負荷部２５と
の間に設けられたスイッチ２３を例えば２回周期的にオ
ン・オフ（オン時間は約１ｍｓ）したときに、波形表示
部３０は自家用発電設備１２が電力供給側１０と連係さ
れている場合における最初のスイッチ２３のオン時とそ
の直前のオフ時、更に次のスイッチ２３のオン時とその
直前のオフ時にそれぞれ電圧検出部２８が検出した電圧
の波形を表示する。In this embodiment, the private power generation equipment 12
Is linked to the power supply side 10, the switch 23 provided between the branch line 20 of the power supply side 12 and the detection impedance load unit 25 is periodically turned on / off twice (on time, for example). Is about 1 ms), the waveform display section 30 displays the first switch 23 in the case where the private power generation facility 12 is linked to the power supply side 10, the first switch 23 in the off state, and the next switch 23 in the on state. The waveform of the voltage detected by the voltage detection unit 28 at the time and at the time of the off immediately before is displayed.
【００３２】そして、最初（１回目）のスイッチ２３の
オン時とその直前のオフ時は電力供給側が正常な時とす
ると、その電圧波形を図３の（ａ）に示す。その電圧波
形において、ｔはスイッチ２３のオン時間を示し、ｔ以
前はスイッチ２３のオンの１サイクル前の波形を示して
いる。ｄｖ1 はスイッチ２３をオンして検出用インピー
ダンス負荷部２５を投入したときの電圧ドロップ、ｖｓ
1 はスイッチ２３をオフした後のサージ電圧（高調波）
を示す。また、次（２回目）のスイッチ２３のオン時と
その直前のオフ時は電力供給側１０が停電等の異常な時
とすると、その電圧波形を図３の（ｂ）に示す。その電
圧波形において、ｔはスイッチ２３のオン時間を示し、
ｔ以前はスイッチ２３のオンの１サイクル前の波形を示
している。ｄｖ2 はスイッチ２３をオンして検出用イン
ピーダンス負荷部２５を投入したときの電圧ドロップ、
ｖｓ2 はスイッチ２３をオフした後のサージ電圧（高調
波）を示す。Assuming that the power supply side is normal when the first (first) switch 23 is turned on and immediately before the switch 23 is turned off, the voltage waveform is shown in FIG. In the voltage waveform, t indicates the ON time of the switch 23, and before t indicates the waveform one cycle before the ON of the switch 23. dv1 is a voltage drop when the switch 23 is turned on and the detection impedance load unit 25 is turned on, vs.
1 is the surge voltage (harmonic) after the switch 23 is turned off
Is shown. Further, assuming that the power supply side 10 is in an abnormal state such as a power failure when the next (second) switch 23 is turned on and immediately before the switch 23 is turned off, the voltage waveform is shown in FIG. In the voltage waveform, t indicates the ON time of the switch 23,
Before t, the waveform of one cycle before the switch 23 is turned on is shown. dv2 is a voltage drop when the switch 23 is turned on and the detection impedance load unit 25 is turned on;
vs2 indicates a surge voltage (harmonic) after the switch 23 is turned off.
【００３３】図３の（ａ）と（ｂ）に示すように、これ
らの電圧波形は電力供給側１０が正常な時と電力供給側
１０が停電等の異常時ではスイッチ２３のオンにより検
出用インピーダンス負荷部２５が投入されたときの電圧
ドロップが異常時では自家用発電機２２のみとなり、こ
の状態でスイッチ２３をオンして検出用インピーダンス
負荷部２５を投入すると、電圧ドロップが正常時の２〜
３倍大きくなる（ｄｖ1 《ｄｖ2 ）ので、波形表示部３
０の電圧波形を見て電力供給側１０が正常か異常かの判
定をすることができる。従って、電力供給側１０が不健
全状態と判断した場合は直ちに自家用発電設備１２を電
力供給側１０から分離させ、自家用発電設備１２側の機
器類の損傷、或いは電力供給側１０の電線路１６の保守
点検時の事故等の各種の事故の発生を防止することがで
きる。なお、サージ電圧の波形が図３の（ａ）、（ｂ）
に示すように電力供給側１０が健全な時に対して電力供
給側１０が停電等の不健全な時に大きくなることによ
り、サージ電圧からも電力供給側１０が健全か不健全か
の判定をすることができる。As shown in FIGS. 3A and 3B, these voltage waveforms are detected by turning on the switch 23 when the power supply side 10 is normal and when the power supply side 10 is abnormal such as a power failure. When the voltage drop when the impedance load unit 25 is turned on is abnormal, only the private generator 22 is used. In this state, when the switch 23 is turned on and the detection impedance load unit 25 is turned on, the voltage drop is 2 to the normal value.
Since it becomes three times larger (dv1 << dv2), the waveform display unit 3
It is possible to determine whether the power supply side 10 is normal or abnormal by looking at the voltage waveform of 0. Therefore, when it is determined that the power supply side 10 is in an unhealthy state, the private power generation facility 12 is immediately separated from the power supply side 10, and the equipment on the private power generation facility 12 side is damaged, or the power line 16 of the power supply side 10 is disconnected. It is possible to prevent various accidents such as accidents during maintenance and inspection. The waveforms of the surge voltage are shown in FIGS.
As shown in the figure, the power supply side 10 becomes larger when the power supply side 10 is in an unhealthy state such as a power failure than when the power supply side 10 is in a healthy state. Can be.
【００３４】次に、電力供給側が健全な時と不健全な時
では電圧波形と電流波形の位相角が違うことにより、電
力供給側１０が健全か不健全かの判定をすることができ
る場合について説明する。スイッチ２３を例えば２回周
期的にオン・オフ（オン時間は約１ｍｓ）したときに、
波形表示部３０は自家用発電設備１２が電力供給側１０
と連係されている場合における最初のスイッチ２３のオ
ン時とその直前のオフ時、更に次のスイッチ２３のオン
時とその直前のオフ時にそれぞれ電圧検出部２８が検出
した電圧の波形と電流検出部２７が検出した電流の波形
を表示する。Next, a case where the power supply side 10 can determine whether the power supply side 10 is healthy or unhealthy due to the difference in phase angle between the voltage waveform and the current waveform when the power supply side is healthy and unhealthy. explain. For example, when the switch 23 is periodically turned on and off twice (on time is about 1 ms),
The waveform display section 30 indicates that the private power generation facility 12 is on the power supply side 10.
The waveform of the voltage detected by the voltage detection unit 28 and the current detection unit when the first switch 23 is turned on and immediately before it is turned off, and when the next switch 23 is turned on and immediately before it is turned off, respectively. 27 displays the waveform of the detected current.
【００３５】そして、最初（１回目）のスイッチ２３の
オン時とその直前のオフ時は電力供給側１０が健全な時
とすると、その電圧波形と電流波形を図４の（ａ）に示
す。その電圧波形において、ｔはスイッチ２３のオン時
間を示し、ｔ以前はスイッチ２３のオンの１サイクル前
の波形を示している。ｄｖ1 はスイッチ２３をオンして
検出用インピーダンス負荷部２５を投入したときの電圧
ドロップ、ｖｓ1 はスイッチ２３をオフした後のサージ
電圧（高調波）、θ1 は電力供給側１０が健全な時の電
圧と電流の位相角を示す。Assuming that the power supply side 10 is healthy when the first (first) switch 23 is turned on and immediately before the switch 23 is turned off, the voltage waveform and the current waveform are shown in FIG. In the voltage waveform, t indicates the ON time of the switch 23, and before t indicates the waveform one cycle before the ON of the switch 23. dv1 is a voltage drop when the switch 23 is turned on and the detection impedance load unit 25 is turned on, vs1 is a surge voltage (harmonic) after the switch 23 is turned off, and θ1 is a voltage when the power supply side 10 is healthy. And the phase angle of the current.
【００３６】また、次（２回目）のスイッチ２３のオン
時とその直前のオフ時は電力供給側１０が停電等の不健
全な時とすると、その電圧波形と電流波形を図４の
（ｂ）に示す。その電圧波形において、ｔはスイッチ２
３のオン時間を示し、ｔ以前はスイッチ２３のオンの１
サイクル前の波形を示している。ｄｖ2 はスイッチ２３
をオンして検出用インピーダンス負荷部２５を投入した
ときの電圧ドロップ、ｖｓ2 はスイッチ２３をオフした
後のサージ電圧（高調波）、θ2 は電力供給側１０が健
全な時の電圧と電流の位相角を示す。Assuming that the power supply side 10 is in an unhealthy state such as a power failure when the next (second) switch 23 is turned on and immediately before the switch 23 is turned off, the voltage waveform and the current waveform are shown in FIG. ). In the voltage waveform, t is the switch 2
3 indicates an ON time, and before t, the ON time of the switch 23 is 1
The waveform before the cycle is shown. dv2 is switch 23
Is turned on to turn on the detection impedance load unit 25, vs2 is the surge voltage (harmonic) after the switch 23 is turned off, and θ2 is the phase of voltage and current when the power supply side 10 is healthy. Indicates a corner.
【００３７】図４の（ａ）と（ｂ）に示すように、電力
供給側１０が健全な時の位相角θ1に対して電力供給側
１０が停電等の不健全な時の位相角θ2 はより大きくな
ったり、小いさくなったりするので、波形表示部３０の
電圧波形と電流波形の位相角の違いを見て電力供給側１
０が健全か不健全かの判定をすることができる。従っ
て、電力供給側１０が不健全状態と判断した場合は直ち
に自家用発電設備１２を電力供給側１０から分離させ、
自家用発電設備１２側の機器類の損傷、或いは電力供給
側１０の電線路１６の保守点検時の事故等の各種の事故
の発生を防止することができる。As shown in FIGS. 4A and 4B, the phase angle θ2 when the power supply side 10 is unhealthy due to a power failure or the like is different from the phase angle θ1 when the power supply side 10 is healthy. Since it becomes larger or smaller, the difference between the phase angles of the voltage waveform and the current waveform on the waveform display unit 30 is considered, and the power supply side 1
It can be determined whether 0 is sound or unhealthy. Therefore, when it is determined that the power supply side 10 is in an unhealthy state, the private power generation equipment 12 is immediately separated from the power supply side 10,
It is possible to prevent damage to the equipment on the private power generation facility 12 side, or occurrence of various accidents such as an accident at the time of maintenance and inspection of the power line 16 on the power supply side 10.
【００３８】さらに、電流検出部２７と電圧検出部２８
で検出した電流値と電圧値から系統健全・不健全判定部
２９では、その計測器演算部２９ａが有効電力、無効電
力を次式に基づき演算し、電力供給側１０が健全な時に
対して電力供給側１０が停電等の不健全な時に有効電
力、無効電力が大きく減少するように変動することによ
り、系統健全・不健全検出部２９の演算結果判別部２９
ｂが計測器演算部２９ａの演算結果から電力供給側１０
が健全か不健全かの判定をすることができる。 有効電力 Ｐ１＝３1/2 ×Ｖ１×ｃｏｓθ1 （電力供給側の健全時） Ｐ２＝３1/2 ×Ｖ２×ｃｏｓθ2 （電力供給側の不健全時） 無効電力 Ｑ１＝３1/2 ×Ｉ１×ｓｉｎθ1 （電力供給側の健全時） Ｑ２＝３1/2 ×Ｉ２×ｓｉｎθ2 （電力供給側の不健全時）Further, the current detector 27 and the voltage detector 28
In the system soundness / unhealth judging unit 29 from the current value and the voltage value detected in the above, the measuring unit operation unit 29a calculates the active power and the reactive power based on the following formula, and the power supply side 10 When the supply side 10 is unhealthy due to a power failure or the like, the active power and the reactive power fluctuate so as to be greatly reduced.
b is the power supply side 10 based on the calculation result of the measuring device calculation unit 29a.
Can be determined whether the sound is healthy or unhealthy. Active power P1 = 3 1/2 × V1 × cos θ1 (when the power supply side is healthy) P2 = 3 1/2 × V2 × cos θ2 (when the power supply side is unhealthy) Reactive power Q1 = 3 1/2 × I1 × sin θ1 (when the power supply side is healthy) Q2 = 3 1/2 × I2 × sin θ2 (when the power supply side is unhealthy)
【００３９】また、前述したように、電力供給側１０が
健全な時と不健全な時ではスイッチ２３のオンによる検
出用インピーダンス負荷部２５の投入により電圧ドロッ
プの程度が違うことにより、電力供給側１０が健全か不
健全かの判定をすることができる場合について説明した
が、これは電力供給側１０と自家用発電設備側１２がい
ずれも交流を発電する場合である。しかし、電力供給側
１０と自家用発電設備側１２がいずれも直流を発電する
場合についても適用できるものであり、図５はその場合
の波形表示部３０が直流電圧を表示している例を示して
いる。Further, as described above, when the power supply side 10 is healthy and unhealthy, the degree of voltage drop differs due to the input of the detection impedance load unit 25 by turning on the switch 23. The case where it is possible to determine whether the power supply 10 is sound or unhealthy has been described. This is a case where the power supply side 10 and the private power generation equipment side 12 both generate AC. However, the present invention is also applicable to the case where both the power supply side 10 and the private power generation facility side 12 generate DC, and FIG. 5 shows an example in which the waveform display unit 30 displays DC voltage in that case. I have.
【００４０】直流発電の場合にも、自家用発電設備１２
が電力供給側１０と連係されている場合に、スイッチ２
３を例えば２回周期的にオン・オフ（オン時間は約１ｍ
ｓ）したときに、波形表示部３０は自家用発電設備１２
が電力供給側１０と連係されている場合における最初の
スイッチ２３のオン時とその直前のオフ時、更に次のス
イッチ２３のオン時とその直前のオフ時にそれぞれ電圧
検出部２８が検出した電圧の波形を表示する。In the case of DC power generation, the private power generation equipment 12
Is connected to the power supply 10, the switch 2
3 periodically on / off twice, for example (on time is about 1 m
s), the waveform display section 30 displays the private power generation equipment 12.
Are connected to the power supply side 10 when the first switch 23 is turned on and immediately before the switch 23 is turned off, and when the next switch 23 is turned on and immediately before the next switch 23 is turned off, Display the waveform.
【００４１】そして、最初（１回目）のスイッチ２３の
オン時とその直前のオフ時は電力供給側１０が正常な時
とすると、その電圧波形を図５の（ａ）に示す。その電
圧波形において、Ｅ1 は電圧値、ｔはスイッチ２３のオ
ン時間、ｔ’はｔ 以前の時間を示し、これらの時間の
波形を示している。ｄｖD1はスイッチ２３をオンして検
出用インピーダンス負荷部２５を投入したときの電圧ド
ロップ、ｖｓD1はスイッチ２３をオフした後のサージ電
圧（高調波）を示す。また、次（２回目）のスイッチ２
３のオン時とその直前のオフ時は電力供給側１０が停電
等の不健全な時とすると、その電圧波形を図５の（ｂ）
に示す。その電圧波形において、Ｅ2 は電圧値、ｔはス
イッチ２３のオン時間、ｔ’はｔ以前の時間を示し、こ
れらの時間の波形を示している。ｄｖD2はスイッチ２３
をオンして検出用インピーダンス負荷部２５を投入した
ときの電圧ドロップ、ｖｓD2はスイッチ２３をオフした
後のサージ電圧（高調波）を示す。Assuming that the power supply side 10 is normal when the first (first) switch 23 is turned on and immediately before the switch 23 is turned off, the voltage waveform is shown in FIG. In the voltage waveform, E1 is the voltage value, t is the ON time of the switch 23, t 'is the time before t, and the waveforms at these times are shown. dvD1 indicates a voltage drop when the switch 23 is turned on and the detection impedance load unit 25 is turned on, and vsD1 indicates a surge voltage (harmonic) after the switch 23 is turned off. Also, the next (second) switch 2
Assuming that the power supply side 10 is in an unhealthy state such as a power outage when the power supply 3 is on and immediately before the power off, the voltage waveform is shown in FIG.
Shown in In the voltage waveform, E2 is the voltage value, t is the ON time of the switch 23, t 'is the time before t, and the waveforms at these times are shown. dvD2 is switch 23
Is turned on to turn on the detection impedance load unit 25, and vsD2 indicates a surge voltage (harmonic) after the switch 23 is turned off.
【００４２】図５の（ａ）と（ｂ）に示すように、これ
らの電圧波形は電力供給側１０が正常な時と電力供給側
１０が停電等の不健全時ではスイッチ２３のオンにより
検出用インピーダンス負荷部２５が投入されたときの電
圧ドロップが不健全時では自家用発電機２２のみとな
り、この状態でスイッチ２３をオンして検出用インピー
ダンス負荷部２５を投入すると、電圧ドロップが健全時
の２〜３倍大きくなる（ｄｖD1《ｄｖD2）ので、波形表
示部３０の電圧波形を見て電力供給側１０が健全か不健
全かの判定をすることができる。なお、直流発電の場合
にも、サージ電圧や電力の変動から電力供給側１０が健
全か不健全かの判定をすることができる。As shown in FIGS. 5A and 5B, these voltage waveforms are detected by turning on the switch 23 when the power supply side 10 is normal and when the power supply side 10 is in an unhealthy state such as a power failure. When the voltage drop when the impedance load unit 25 is turned on is unhealthy, only the private generator 22 is used. In this state, when the switch 23 is turned on and the impedance load unit 25 for detection is turned on, the voltage drop when the voltage drop is normal Since the value is two to three times larger (dvD1 << dvD2), it is possible to determine whether the power supply side 10 is healthy or unhealthy by looking at the voltage waveform on the waveform display unit 30. In the case of DC power generation as well, it is possible to determine whether the power supply side 10 is healthy or unhealthy from fluctuations in surge voltage and power.
【００４３】[0043]
【発明の効果】以上のように、本発明の請求項１によれ
ば、電力供給側の発電機に接続された電力供給用連系遮
断器と、電力供給用連系遮断器に分岐線を介して接続さ
れた自家用発電機と、分岐線に設けられた自家用連系遮
断器と、自家用発電機から主として電力を供給される自
家用負荷とを備えた自家用発電設備において、自家用発
電設備が電力供給側と連係されている場合に、電力供給
側の分岐線と検出用インピーダンス負荷部との間に設け
られたスイッチを少なくとも２回以上周期的にオン・オ
フしたときに、波形表示部は自家用発電設備が連係され
ている場合における最初のスイッチのオン時と次のスイ
ッチのオン時にそれぞれ電圧検出部が検出した電圧ドロ
ップの波形を表示し、その電圧ドロップの電圧波形は電
力供給側が健全な時と電力供給側が停電等の不健全な時
ではスイッチのオンにより検出用インピーダンス負荷部
が投入されたときの電圧ドロップが不健全時では健全時
の２〜３倍大きくなるので、波形表示部の電圧ドロップ
の電圧波形を見て電力供給側が健全か不健全かの判定を
容易にすることができ、電力供給側が不健全状態と判断
した場合は直ちに自家用発電設備を電力供給側から分離
させ、自家用発電設備側の機器類の損傷、或いは電力供
給側の電線路の保守点検時の事故等の各種の事故の発生
を防止できるという効果を有する。また、本発明の請求
項２によれば、電力供給側の発電機に接続された電力供
給用連系遮断器と、電力供給用連系遮断器に分岐線を介
して接続された自家用発電機と、分岐線に設けられた自
家用連系遮断器と、自家用発電機から主として電力を供
給される自家用負荷とを備えた自家用発電設備におい
て、自家用発電設備が電力供給側と連係されている場合
に、電力供給側の分岐線と検出用インピーダンス負荷部
との間に設けられたスイッチを少なくとも２回以上周期
的にオン・オフしたときに、波形表示部は自家用発電設
備が連係されている場合における最初のスイッチのオン
時の後のオフ時と次のスイッチのオン時の後のオフ時に
それぞれ電圧検出部が検出したサージ電圧の電圧波形を
表示し、そのサージ電圧の波形は電力供給側が健全な時
と電力供給側が停電等の不健全な時ではスイッチのオン
の後のオフにより検出用インピーダンス負荷部が投入さ
れたときのサージ電圧が不健全時では健全時の２〜３倍
大きくなるので、波形表示部のサージ電圧の波形を見て
電力供給側が健全か不健全かの判定を容易にすることが
でき、電力供給側が不健全状態と判断した場合は直ちに
自家用発電設備を電力供給側から分離させ、自家用発電
設備側の機器類の損傷、或いは電力供給側の電線路の保
守点検時の事故等の各種の事故の発生を防止できるとい
う効果を有する。さらに、本発明の請求項３によれば、
自家用発電設備における電力供給側系統の健全・不健全
を検出する装置における電力供給側の発電機及び自家用
発電機が直流発電機とするときにも、波形表示部の電圧
ドロップ又はサージ電圧の波形を見て電力供給側が健全
か不健全かの判定をすることができるという効果があ
る。As described above, according to the first aspect of the present invention, the power supply breaker connected to the power supply-side generator and the branch line are connected to the power supply breaker. A private generator connected to the private power generator, a private circuit breaker provided on the branch line, and a private load mainly supplied with power from the private generator, the private power generator supplies power. When the switch provided between the branch line on the power supply side and the impedance load unit for detection is periodically turned on and off at least twice or more when the power supply side is linked to the power supply side, the waveform display unit displays When the first switch is turned on and the next switch is turned on when the equipment is linked, the waveform of the voltage drop detected by the voltage detection unit is displayed. When the power supply side is unhealthy, such as a power failure, the voltage drop when the detection impedance load unit is turned on by switching on is twice or three times larger than that in the unhealthy state when the switch is turned on. It is easy to determine whether the power supply side is healthy or unhealthy by looking at the voltage waveform of the drop.If the power supply side is judged to be in an unhealthy state, the private power generation equipment is immediately separated from the power supply side, and the private power generation is performed. This has the effect of preventing the occurrence of various types of accidents such as damage to equipment on the equipment side or accidents during maintenance and inspection of the power supply-side power line. Further, according to claim 2 of the present invention, a power supply interconnection breaker connected to a power supply-side generator, and a private generator connected to the power supply interconnection breaker via a branch line And, in a private power generating facility provided with a private circuit breaker provided on a branch line and a private load mainly supplied with power from the private generator, when the private power generating facility is linked to the power supply side When the switch provided between the branch line on the power supply side and the impedance load unit for detection is periodically turned on and off at least two times or more, the waveform display unit is used when the private power generation equipment is linked. The voltage waveform of the surge voltage detected by the voltage detection unit is displayed when the first switch is turned off after turning on and after the next switch is turned on, and the surge voltage waveform is displayed when the power supply side is sound. Time When the power supply side is unhealthy, such as a power failure, the surge voltage when the detection impedance load section is turned on after the switch is turned on after the switch is turned on is two to three times larger than the healthy state when the power supply is unhealthy. It is possible to easily determine whether the power supply side is healthy or unhealthy by looking at the waveform of the surge voltage of the part, and if the power supply side is determined to be in an unhealthy state, the private power generation equipment is immediately separated from the power supply side, This has the effect of preventing various types of accidents, such as damage to equipment on the private power generation facility side or accidents during maintenance and inspection of the power supply-side power line, and the like. Further, according to claim 3 of the present invention,
Even when the generator on the power supply side and the generator for private use in the device for detecting the soundness / unhealthyness of the power supply side system in the private power generation equipment are DC generators, the waveform of the voltage drop or surge voltage of the waveform display section is displayed. There is an effect that it is possible to determine whether the power supply side is healthy or unhealthy.
【００４４】また、本発明の請求項４によれば、電力供
給側の発電機に接続された電力供給用連系遮断器と、電
力供給用連系遮断器に分岐線を介して接続された自家用
発電機と、分岐線に設けられた自家用連系遮断器と、自
家用発電機から主として電力を供給される自家用負荷と
を備えた自家用発電設備において、自家用発電設備が電
力供給側と連係されている場合に、電力供給側の分岐線
と検出用インピーダンス負荷部との間に設けられたスイ
ッチを少なくとも２回以上周期的にオン・オフしたとき
に、波形表示部は自家用発電設備が連係されている場合
における最初のスイッチのオン時及びオフ時と次のスイ
ッチのオン時及びオフ時にそれぞれ電流検出部が検出し
た電流の波形と電圧検出部が検出した電圧の波形とがな
す位相角が電力供給側が健全な時と電力供給側が停電等
の不健全時では不健全時は健全時に比べて変動するの
で、波形表示部の電圧波形と電流波形の位相角を見て電
力供給側が健全か不健全かの判定を容易にすることがで
き、電力供給側が不健全状態と判断した場合は直ちに自
家用発電設備を電力供給側から分離させ、自家用発電設
備側の機器類の損傷、或いは電力供給側の電線路の保守
点検時の事故等の各種の事故の発生を防止できるという
効果を有する。According to the fourth aspect of the present invention, the power supply interconnection breaker connected to the power supply-side generator and the power supply interconnection breaker connected via the branch line. In a private power generator equipped with a private generator, a private circuit breaker provided on a branch line, and a private load mainly supplied with power from the private generator, the private generator is linked to the power supply side. In this case, when the switch provided between the branch line on the power supply side and the impedance load unit for detection is periodically turned on and off at least twice or more, the waveform display unit is linked to the private power generation equipment. When the first switch is turned on and off and the next switch is turned on and off, the phase angle between the current waveform detected by the current detection unit and the voltage waveform detected by the voltage detection unit is determined by the power supply. When the power supply side is healthy or unhealthy, the power supply side fluctuates when the power supply side is unhealthy, such as a power failure. If the power supply side is judged to be in an unhealthy state, the private power generation equipment is immediately separated from the power supply side, and the equipment on the private power generation equipment side is damaged, or the electric power line on the power supply side. This has the effect of preventing the occurrence of various accidents such as an accident during maintenance and inspection of the vehicle.
【図１】本発明の実施形態１に係る自家用発電設備にお
ける電力供給側系統の健全・不健全を検出する装置の構
成を示す単線結線図である。FIG. 1 is a single-line diagram showing a configuration of an apparatus for detecting the soundness / unhealthyness of a power supply side system in a private power generation facility according to Embodiment 1 of the present invention.
【図２】本発明の実施形態２に係る自家用発電設備にお
ける電力供給側系統の健全・不健全を検出する装置の構
成を示す単線結線図である。FIG. 2 is a single-line diagram showing a configuration of a device for detecting the soundness / unhealthyness of a power supply side system in a private power generation facility according to Embodiment 2 of the present invention.
【図３】同自家用発電設備における電力供給側系統の健
全・不健全を検出する装置の波形表示部が表示する電圧
の波形図である。FIG. 3 is a waveform diagram of a voltage displayed by a waveform display unit of a device that detects the soundness / unhealthyness of a power supply side system in the private power generation facility.
【図４】同自家用発電設備における電力供給側系統の健
全・不健全を検出する装置の波形表示部が表示する電圧
の位相波形図である。FIG. 4 is a phase waveform diagram of a voltage displayed by a waveform display unit of a device for detecting the soundness / unhealthyness of a power supply side system in the private power generation facility.
【図５】同自家用発電設備における電力供給側系統の健
全・不健全を検出する装置の波形表示部が表示する直流
電圧の波形図である。FIG. 5 is a waveform diagram of a DC voltage displayed by a waveform display unit of a device for detecting soundness / unhealthyness of a power supply side system in the private power generation facility.
１０ 電力供給側 １２ 自家用発電設備 １４ 発電機 １５ 電力供給用連系遮断器 １６ 電線路 ２０ 分岐線 ２０ａ 分岐支線 ２１ 自家用連系遮断器 ２２ 自家用発電機 ２３ スイッチ ２５ 検出用インピーダンス負荷部 ２７ 電流検出部 ２８ 電圧検出部 ２９ 系統健全・不健全判定部 Reference Signs List 10 power supply side 12 private power generation equipment 14 generator 15 power supply interconnection breaker 16 electric wire line 20 branch line 20a branch branch line 21 private interconnection breaker 22 private generator 23 switch 25 detection impedance load unit 27 current detection unit 28 Voltage detection unit 29 System health / unhealth determination unit
Claims (4)
給用連系遮断器と、電力供給用連系遮断器に分岐線を介
して接続された自家用発電機と、分岐線に設けられた自
家用連系遮断器と、自家用発電機から主として電力を供
給される自家用負荷とを備えた自家用発電設備であっ
て、 この自家用発電設備は、分岐線の自家用発電機側に接続
された検出用インピーダンス負荷部と、分岐線と検出用
インピーダンス負荷部との間に設けられ、少なくとも２
回以上周期的にオン・オフするスイッチと、分岐線にお
ける電圧を検出する電圧検出部と、自家用発電設備が連
係されている場合における最初のスイッチのオン時と次
のスイッチのオン時にそれぞれ電圧検出部が検出した電
圧ドロップの波形を表示する波形表示部とを備えたこと
を特徴とする自家用発電設備における電力供給側系統の
健全・不健全を検出する装置。1. A power supply circuit breaker connected to a power supply-side generator, a private generator connected to the power supply circuit breaker via a branch line, and a branch line provided A private power generation facility having a private circuit breaker and a private load mainly supplied with electric power from the private power generator, wherein the private power generator is connected to the private power generator side of the branch line.
Detection impedance load section, branch line and detection
At least 2
Switch that turns on / off periodically and
Voltage detection unit that detects the voltage
First switch on and next
When the switches are turned on,
An apparatus for detecting the soundness / unhealthyness of a power supply side system in a private power generation facility, comprising: a waveform display unit for displaying a pressure drop waveform .
給用連系遮断器と、電力供給用連系遮断器に分岐線を介
して接続された自家用発電機と、分岐線に設けられた自
家用連系遮断器と、自家用発電機から主として電力を供
給される自家用負荷とを備えた自家用発電設備であっ
て、 この自家用発電設備は、分岐線の自家用発電機側に接続
された検出用インピーダンス負荷部と、分岐線と検出用
インピーダンス負荷部との間に設けられ、少なくとも２
回以上周期的にオン・オフするスイッチと、分岐線にお
ける電圧を検出する電圧検出部と、自家用発電設備が連
係されている場合における最初のスイッチのオン時の後
のオフ時と、次のスイッチのオン時の後のオフ時にそれ
ぞれ電圧検出部が検出したサージ電圧の波形を表示する
波形表示部とを備えたことを特徴とする自家用発電設備
における電力供給側系統の健全・不健全を検出する装
置。2. A power supply circuit breaker connected to a power supply-side generator, a private power generator connected to the power supply circuit breaker via a branch line, and a power supply breaker provided on the branch line. A private power generation facility having a private circuit breaker and a private load mainly supplied with electric power from the private power generator, wherein the private power generator is connected to the private power generator side of the branch line.
Detection impedance load section, branch line and detection
At least 2
Switch that turns on / off periodically and
Voltage detection unit that detects the voltage
After the first switch-on when engaged
Off and off after the next switch on
Displays the surge voltage waveform detected by each voltage detector
A device for detecting the soundness / unhealthyness of a power supply side system in a private power generation facility, comprising: a waveform display unit .
機が直流発電機であることを特徴とする請求項１又は２
のいずれか記載の自家用発電設備における電力供給側系
統の健全・不健全を検出する装置。 3. A power generator and a private power generator on the power supply side.
3. The device according to claim 1, wherein the generator is a DC generator.
Power supply side system for private power generation facilities described in any of the above
A device that detects the soundness and unhealthyness of the system.
給用連系遮断器と、電力供給用連系遮断器に分岐線を介
して接続された自家用発電機と、分岐線に設けられた自
家用連系遮断器と、自家用発電機から主として電力を供
給される自家 用負荷とを備えた自家用発電設備であっ
て、 この自家用発電設備は、分岐線の自家用発電機側に接続
された検出用インピーダンス負荷部と、分岐線と検出用
インピーダンス負荷部との間に設けられ、少なくとも２
回以上周期的にオン・オフするスイッチと、分岐線に流
れる電流を検出する電流検出部と、分岐線における電圧
を検出する電圧検出部と、自家用発電設備が連係されて
いる場合における最初のスイッチのオン時及びオフ時と
次のスイッチのオン時及びオフ時にそれぞれ電流検出部
が検出した電流の波形と電圧検出部が検出した電圧の波
形とがなす位相角を表示する波形表示部とを備えたこと
を特徴とする自家用発電設備における電力供給側系統の
健全・不健全を検出する装置。 4. An electric power supply connected to a generator on the electric power supply side.
Via a branch line to the power supply breaker and the power supply breaker
And a private generator connected to the branch line
Power is mainly supplied from the home circuit breaker and the private generator.
There in private power generation facility that includes a sheet is being self-supply load
Te, the private power generation equipment is connected to the private generator side of the branch line
Detection impedance load section, branch line and detection
At least 2
Switch that turns on / off periodically and
Current detector that detects the current flowing through the
The voltage detector that detects
The first switch on and off when
When the next switch is on and off, the current detector
Current waveform detected by the voltage detector and voltage waveform detected by the voltage detector
And a waveform display section for displaying a phase angle formed by the shape.
Of the power supply side system in private power generation facilities
A device that detects soundness and unhealthyness.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP09199496A JP3097030B2 (en) | 1997-07-25 | 1997-07-25 | Apparatus for detecting the soundness / unhealthyness of the power supply system in private power generation facilities |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP09199496A JP3097030B2 (en) | 1997-07-25 | 1997-07-25 | Apparatus for detecting the soundness / unhealthyness of the power supply system in private power generation facilities |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1146442A JPH1146442A (en) | 1999-02-16 |
| JP3097030B2 true JP3097030B2 (en) | 2000-10-10 |
Family
ID=16408796
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP09199496A Expired - Fee Related JP3097030B2 (en) | 1997-07-25 | 1997-07-25 | Apparatus for detecting the soundness / unhealthyness of the power supply system in private power generation facilities |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3097030B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4484386B2 (en) * | 2001-03-27 | 2010-06-16 | 大阪瓦斯株式会社 | Diagnostic device for cogeneration system |
-
1997
- 1997-07-25 JP JP09199496A patent/JP3097030B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH1146442A (en) | 1999-02-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| AU2010203040B2 (en) | Corrective device protection | |
| CN1050238C (en) | Detector for monitoring integrity of ground connection of electrical appliance | |
| KR101193145B1 (en) | Cabinet panel for prevention disaster of neutral line peculiar and control method thereof | |
| JP4994140B2 (en) | Ratio differential relay and ratio differential relay malfunction prevention method | |
| KR101417940B1 (en) | Cabinet panel for prevention disaster of abnormal voltage protection and method thereof | |
| KR20140121593A (en) | Power quality recovery relay | |
| KR102442617B1 (en) | Protection relay installation compliance inspection method and inspection apparatus | |
| JP3097030B2 (en) | Apparatus for detecting the soundness / unhealthyness of the power supply system in private power generation facilities | |
| KR101999606B1 (en) | Protective Apparatus and Method for Zero Harmonic Filter | |
| KR101208467B1 (en) | Cabinet panel for prevention disaster of neutral line peculiar and control method thereof | |
| JP6834334B2 (en) | Arc failure detection system | |
| JP3114140B2 (en) | Apparatus for detecting the soundness / unhealthyness of the power supply system in private power generation facilities | |
| JP3030813B2 (en) | Standalone operation detection device for private power generation equipment | |
| KR101999603B1 (en) | Protective Apparatus and Method for Power System | |
| KR101395551B1 (en) | Cabinet panel for prevention disaster of abnormal voltage protection and method thereof | |
| JP4243709B2 (en) | Independent operation detection system for private power generation facilities | |
| KR20140013646A (en) | Device for prevention disaster of abnormal voltage protection in electric power system and method thereof | |
| JP2000014016A (en) | Single operation detector for private power generating equipment | |
| JP2021515531A (en) | Power phase loss detection and compensation | |
| JP2633150B2 (en) | Method and device for detecting state of reverse charging from private power generation facility to power supply system side | |
| JP4280959B2 (en) | Independent operation detection system for private power generation facilities | |
| KR102409587B1 (en) | Power line insulation monitoring apparatus and method | |
| KR101832108B1 (en) | Distributions Board Built in Zero Harmonic Reduction Apparatus equipped with Protective Functions of Electric Power Comparison | |
| KR20170058246A (en) | Distributing board having a function of sensing leakage current | |
| JP4318393B2 (en) | Independent operation detection system for private power generation facilities |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080811 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090811 Year of fee payment: 9 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090811 Year of fee payment: 9 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100811 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100811 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110811 Year of fee payment: 11 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120811 Year of fee payment: 12 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130811 Year of fee payment: 13 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| LAPS | Cancellation because of no payment of annual fees |