JP3721744B2

JP3721744B2 - Uninterruptible switching system between different power sources

Info

Publication number: JP3721744B2
Application number: JP27869697A
Authority: JP
Inventors: 敬一田中; 勇須藤
Original assignee: Meidensha Corp
Current assignee: Meidensha Corp
Priority date: 1997-10-13
Filing date: 1997-10-13
Publication date: 2005-11-30
Anticipated expiration: 2017-10-13
Also published as: JPH11122844A

Description

【０００１】
【発明の属する技術分野】
本発明は、商用配電線路の一部区間で停電工事等を行う場合において、工事区間より下流側負荷を一時的に常用電源と異なる電力供給用補助電源を用いて無停電救済する際の異電源間無停電切替システムに関するものである。
【０００２】
【従来の技術】
従来の異電源間無停電切替システムには、例えば図３（ａ）に示す実公平５−８７６６号のシステムがある。このシステムは電力供給用補助電源（電源車）を仮設開閉器直近に設置し、電源車から６本もの多数のケーブルを活線接続することが必要であった。
【０００３】
この問題を解決するために、従来は図４のような従来の異電源間無停電切替システムが提案されていた。図４において１は配電用変電所、２は商用高圧配電線路、３ａ，３ｂは配電線路２に介挿された柱上区分開閉器、４は無停電救済負荷群である。配電線路２において、配電用変電所１と柱上区分開閉器３ａ間を変電所直送区間とし、柱上区分開閉器３ａと３ｂ間を停電工事区間、柱上区分開閉器３ｂと無停電救済負荷群４との間を無停電救済区間とする。なお、柱上区分開閉器３ｂに示す箇所は、縁まわし線部分等における一時的な線路開放部分（切断→再接続する部分）の場合もある。
【０００４】
停電工事に先立ち、区分開閉器設置の配電柱に仮設用開閉器（通称“工事用開閉器”とも云う）５を活線接続部７ａ，７ｂ、接続ケーブル６ａ，６ｂ，および検電端子付ブッシング８ａ，８ｂを介して活線接続する。また、配電柱下方には同期確認装置９を仮取り付けして信号ケーブルによって仮設用開閉器５の主回路ブッシング８ａ，８ｂの検電端子と相互接続する。なお、１１は同期検定手段、１２は同期確認スイッチである。前記検電端子はブッシングに接続された接続ケーブル６ａ，６ｂが充電状態にあるとき、検電端子（電極）がコンデンサ分圧作用で低圧レベルの電位を生ずるものであり、各ブッシングの電位信号を検出することにより前記の同期確認装置９を機能させている。
【０００５】
従って、本工事開始にあたっては先ず上記装置類を取り付けのうえ仮設用開閉器５を閉じるとともに、柱上区分開閉器３ｂを開放する。なお仮設用開閉器５の開閉操作は、付属の引き紐にてハンドル操作を行うのが一般的である。
【０００６】
また、図４において１３は活線接続部７ｃ，接続ケーブル６ｃおよび接続用コネクタ１４を介して配電線路２に接続された補助電源である並列運転機能付移動用発電装置であって、この移動用発電装置１３は原動機（ＰＭ）１５，交流発電機（ＡＧ）１６，交流遮断器１７，および断路器１８からなる主回路部と、同期制御装置１９，自動電圧調整装置（ＡＶＲ）２１，電圧設定器２２，速度設定器２３および調速装置（ＧＯＶ）２４からなる制御回路部によって構成されている。
【０００７】
次に、柱上区分開閉器３ｂの負荷側に活線接続されている並列運転機能付移動用発電装置１３を始動し、同期制御装置１９により配電系統に対し発電側を同期化制御のうえ、交流遮断器１７により並列投入する。その後、仮設用開閉器５を開放すれば無停電救済負荷群４に対しては発電装置１３から給電が継続される。その間に柱上区分開閉器３ａも開放すれば配電系統の開閉器３ａ〜３ｂ間の停電工事を実施できる。
【０００８】
配電線路側工事完了後、柱上区分開閉器３ａを投入すれば仮設用開閉器５の電源側まで配電系統が復帰したことになる。この時点で同期検定手段１１（ＳＹ）で目視確認により電源突き合わせ点の同期検定を行う。周波数差が大きい場合は、同期検定表示を目視確認しながら、移動用発電装置１３側操作により回転速度を調整し、規定の周波数差（位相差変化の遅速で判断）に追い込むと共に、両電源の同期点（位相差≒０）付近で仮設用開閉器５を閉路すれば発電側から配電系統側へ無停電で切り戻しができたことになる。
【０００９】
【発明が解決しようとする課題】
上記のように構成されたシステムにおいて、前記配電線路側工事完了後、主回路開放中の仮設用開閉器５の電源側端子まで配電線側電源が復旧して来た時点で、同開閉器負荷側端子には発電装置（１３）側電源が印加されているため、同期確認装置９で両電源間の周波数差並びに位相差確認を行うとともに、同期合わせのため移動用発電装置１３側の周波数調整（回転数調整）操作が必要となる。このときの発電装置（１３）側操作は、前記同期確認装置９の同期検定手段１１を目視確認しながらの手動（周波数上昇又は下降スイッチなどによる）操作となる。
【００１０】
このため同期確認装置９の仮取り付け場所と、移動用発電装置１３送電場所（駐車場所）とが少し離れる（通常１０〜５０ｍ位離れている）と、双方にオペレータを配し、トランシーバー等により伝令し合うことが必要になり、人手を要した上に、双方の口頭連絡だけが頼りのため確実な周波数調整作業は至難である。
【００１１】
また、仮設用開閉器５の電源側並びに負荷側端子に印加される電圧は、検電端子（８ａ，８ｂ）を介して同期確認装置９に取り込むため、双方の電圧位相比較は容易に行えるが、電圧値自体は検出誤差が大きいため双方の電圧値を比較確認することは出来ない。すなわち、本来異電源間の同期化のためには（１）周波数を合わせる、（２）電圧位相を合わせる、（３）電圧値を合わせることが必要であるが、このうちの電圧値を合わせる操作、確認が出来ないままで異電源間の同期投入を行うことになる。もともと配電系統側電源は公称電圧の±５％程度の電圧変動要素を有しており、復電電圧は切替前の電圧と異なっていることは容易に想定される。従って電圧合わせを都合上省略した異電源間の同期投入は、投入瞬時両電源間に過大な無効横流を惹起し、特に発電装置側損傷の原因になりかねない。
【００１２】
前記したように従来技術では、両装置（９，１３）間の伝令を人手に頼り、かつ発電装置１３側をマニュアル操作で位相差を追い込み、同期確認装置９側で目視確認しながら仮設用開閉器５の引き紐で入操作を行っている。この場合、手動引操作による動作遅れや、発電装置１３側負荷急変などのため結果として位相差が大幅にずれた状態（一般的には位相差投入許容値は±１０゜以内程度と云われている）での誤投入（非同期投入）となり、その程度如何によっては過大な横流によって、特に発電装置１３側に致命的な損傷を生ずる結果となり、安全上の見地から見ても望ましいシステムとは云い難い。
【００１３】
更にこのような従来技術による異電源間無停電切替システムの最大の欠点は、仮設用開閉器５の引紐により“入”操作を行ったとき、電気的に同期投入可能状態以外は機械的に投入不可能になるようなインターロック機構をシステム的に組み込めないところにある（非同期投入防止のためのインターロック機構が組み込めない）。
【００１４】
また、上記問題点を解決するために図５に示す異電源間無停電切替システムが提案されている。図５において図４と同一部分は同一符号をもって示している。図５において図４と異なる点は、仮設用開閉器５、検電端子付ブッシング８ａ，８ｂ、同期確認装置９の代わりに、接続ケーブル着脱用ブッシング３０ａ，３０ｂおよび異電源同期投入用仮設開閉器３１を設けるとともに、発電装置１３に同期化信号受信装置３２を設けて並列運転機能付移動用発電装置３３を構成したことにあり、その他の部分は図４と同一に構成されている。
【００１５】
異電源同期投入用仮設開閉器３１は、両端部に計器用変圧器ＰＴ１，ＰＴ２が各々内蔵された仮設用開閉器３４と、前記変圧器ＰＴ１，ＰＴ２の電圧信号に基づいて同期検定を行う同期検定手段１１（ＳＹ）および同期確認スイッチ１２と、前記仮設用開閉器３４の同期投入可能条件が成立したか否かを判断する同期投入可能判断回路３５と、前記同期投入可能条件成立時に付勢される同期投入可能信号用リレーＩＬＣと、前記同期投入可能条件未成立時に同期化制御信号を作成し、自動同期指令として前記発電装置３３へ発信する同期化信号発信装置３６と、前記同期投入可能信号用リレーＩＬＣの付勢時にその常開接点が閉じることにより、計器用変圧器ＰＴ１を電源として励磁される開閉器投入禁止解除コイルＬＣと、前記リレーＩＬＣの常開接点に並列接続された単独送電用の同期条件解除スイッチ３７とで構成されている。
【００１６】
しかしながら図５のシステムは電圧検出手段及び制御電源に計器用変圧器ＰＴ１、ＰＴ２を設けているため、仮設開閉器が特殊で、質量が大きく、作業性が非常に悪いという欠点があった。すなわち仮設開閉器は電柱上等に設置することから、取り扱い上軽量化が望まれるものであった。
【００１７】
本発明は上記の点に鑑みてなされたものでその目的は、移動用発電装置の同期化運転調整を自動化して仮設用開閉器側の同期確認装置と移動用発電装置間の人手に頼った連絡を不要にするとともに、仮設用開閉器に対して、非同期投入防止のためのインターロック機構を設けて発電装置等の損傷防止を図り、且つ仮設開閉器の小型軽量化を図った異電源間無停電切替システムを提供することにある。
【００１８】
【課題を解決するための手段】
本発明は、主電源である常用電源と負荷を結ぶ配電線の所定区間に介挿された区分開閉器と、前記常用電源とは異なる電源であり、前記区分開閉器の負荷側の配電線に、電源切り替え時に接続される電力供給用補助電源と、電源切り替え時に、前記区分開閉器に並列接続される仮設用開閉器とを備え、常用電源と電力供給用補助電源間の電源切り替えを、前記両電源の同期をとって無停電で行う異電源間無停電切替システムにおいて、
（１）前記仮設用開閉器に、該開閉器の両端部に各々内蔵された電圧検出器と、前記電圧検出器を介して導入された電圧信号に基づいて常用電源と電力供給用補助電源の同期検定を行う同期検定手段と、蓄電池を制御電源とし、前記同期検定手段の出力信号と、常用電源および前記補助電源間の電位差、周波数差、位相差とに基づいて、前記仮設用開閉器の同期投入可能条件が成立したか否かを判断する同期投入可能判断回路と、前記同期投入可能条件未成立時に、常用電源を基準とする前記補助電源に対する同期化制御信号を作成するとともに、該同期化制御信号を所定の信号伝送手段によって前記補助電源に発信する同期化信号発信装置とを設け、前記電力供給用補助電源に、前記同期化信号発信装置から発信された同期化信号を受信する同期化信号受信装置を設け、前記補助電源から常用電源への電源切り戻し時に、前記受信された同期化信号に基づいて自動的に同期化運転制御を行い、前記同期投入可能判断回路の同期投入可能条件成立時は、所定の投入手段によって前記仮設用開閉器を投入可能とすることを特徴とし、
（２）前記所定の投入手段は、前記仮設用開閉器に、前記同期投入可能判断回路の同期投入可能条件成立時に仮設用開閉器の投入禁止を解除する機構を設け、仮設用開閉器の非同期投入防止ができることを特徴とし、
（３）前記所定の投入手段は、前記仮設用開閉器に、前記同期投入可能判断回路の同期投入可能条件成立時に励磁されるとともに、仮設用開閉器を自動投入する開閉器投入コイルを設けて成ることを特徴とし、
（４）前記仮設用開閉器は、電圧検出器と一体的に形成されて仮設開閉部を構成し、前記同期検定手段、同期投入可能判断回路、同期化信号発信装置を一体的に形成して同期検出部を構成し、前記仮設開閉部と同期検出部とはケーブルを介して電気的に接続され、蓄電池を電源としたことを特徴としている。
【００１９】
【発明の実施の形態】
図１は本発明の実施の形態を示す機能ブロック図である。図１において図５と同一部分は同一符号をもって示している。図１において図５と異なる点は、異電源同期投入用仮設開閉器３１を、計器用変圧器にＰＴ１、ＰＴ２に代わる電圧検出器５０ａ、５０ｂおよび仮設用開閉器３４および投入禁止解除コイルＬＣからなる仮設開閉部３１０と、同期検出用の、バッテリー（蓄電池）による制御電源５１および前記電圧検出器５０ａ，５０ｂの電圧信号に基づいて同期検定を行う同期検定手段１１（ＳＹ）、同期確認スイッチ１２、同期投入可能判断回路３５、同期化信号発信装置３６、同期投入可能信号用リレーＩＬＣ、同期条件解除スイッチ３７から成る同期検出部３１１とで構成したことにあり、その他の部分は図５と同一に構成されている。尚、６ｄ，６ｅ，６ｆは接続ケーブル、３０ｃ〜３０ｈは接続ケーブル着脱用ブッシングである。
【００２０】
（１）仮設用開閉器３４は、次のような異電源同期投入用仮設開閉器としての機能を付加したものである。
【００２１】
（２）異電源同期投入用仮設開閉器３１には以下に述べる機能を原則として内蔵しているが、後述のように、必要により目視確認用同期検定手段１１や同期確認スイッチ１２などはオペレータが操作容易なように配電柱下の手元まで補助信号ケーブルを用いてリモート監視・操作式としている。
【００２２】
（３）本異電源同期投入用仮設開閉器３１の特徴を記載すると、
（イ）仮設用開閉器３４は投入禁止解除コイルＬＣ付とし、原則として同期投入可能判断回路３５で同期投入可能条件が成立した場合のみ解除コイルＬＣが励磁され、内蔵開閉器３４の投入動作阻止機構が解除されて同期投入可能条件成立期間中のみ引紐等による入操作を実際に受け付ける。反対に前記の電気的投入可能条件が不成立の場合は、オペレータが引紐等により入操作をしても機械的に投入でき得ない。なお、負荷側無電圧状態で、電源側より電源送りする場合（単独送電）等のために、別途同期条件解除スイッチ３７を有している。
【００２３】
（ロ）同期投入確認機能としては、同期確認スイッチ１２を入れると、目視確認用としての同期検定手段１１の他、同期投入可能判断回路３５（電源側及び負荷側印加電源間の電圧差、周波数差、位相差を検出の上同期投入可能条件が成立したか否かを判断する）で前記（イ）項の同期投入可能信号を作ると共に、電源側電源（配電線側電源）を基準に負荷側電源（発電装置電源）に対する同期化信号（発電装置電圧を上／下させる信号、並びに周波数を上／下させる信号）を作ると共に、それを発電装置３３に発信するための同期化信号発信装置３６から成っている。なお、同期投入可能条件成立期間中は、外部表示もあわせて行いオペレータに知らせる機能も有している。
【００２４】
（ハ）図１においては、前記異電源同期投入用仮設開閉器３１と移動用発電装置３３間のワイヤレス化を図るため同期化信号発信装置３６は無線式とし、移動用発電装置３３側には同期化信号受信装置３２を備えている（但し、経済性等との見合いから送・受信装置を適宜対応することにより、信号伝送手段としてはワイヤ式信号ケーブルあるいは光ファイバーケーブル方式とするか、或は結合装置（ＣＣ）を使用して配電線搬送により制御する方式とすることもできる）。
【００２５】
（ニ）さらに本仮設開閉器３１の特長として、前記（イ）〜（ハ）に述べた内蔵各装置を機能させるための制御電源は、バッテリー（５１）を用いているので、検出電圧精度が従来技術のブッシング部の検電端子（図４の８ａ，８ｂ）からの検出に比べ格段に良く、前記（ロ）項に述べた同期投入可能条件や同期化信号を作るにあたっては両電源側の電圧差，周波数差，位相差とも精度のよいものとすることができる。
【００２６】
また、接続ケーブル着脱用ブッシング３０ａ，３０ｂは特に検電端子付であることを要しない。
【００２７】
（ホ）本異電源同期投入用仮設開閉器３１の配電線への介挿場所は、従来技術の仮設用開閉器と同様、線路上の柱上区分開閉器部分のみならず、縁まわし線部分等、一時的に線路が開放できる箇所であれば良い。
【００２８】
（４）並列運転機能付移動用発電装置３３は前記に見合う同期化信号受信装置３２を備え、配電線側電源復電後の発電装置３３から配電線側への切り戻しにあたっては、異電源同期投入用仮設開閉器３１に内蔵されている同期化信号発信装置３６からの信号により、自動動作で同期化制御が行える。従って、この間オペレータは異電源同期投入用仮設開閉器３１側のみで監視、操作を行えば良く、従来技術例のように、双方にオペレータを配し、トランシーバなどを使用して逐一やり取りをしなくても済む。
【００２９】
全体システムの装置取付手順等は従来技術に準ずるが、配電線への切り戻し時は前記したように異電源同期投入用仮設開閉器３１側で同期確認スイッチ１２を入れれば、発電装置３３側は自動的に同期化運転に入り、オペレータは仮設開閉器側同期検定手段１１を余裕をもって監視しながら、同期投入可能表示点灯を確認のうえ開閉器入操作（通常は引紐操作）すれば良い。万一、同期可能条件を外れていれば入操作にはロックがかかるので安心して操作できる。
【００３０】
すなわち同期投入可能判断回路３５で、同期可能条件を外れていると判断された場合は、同期投入可能信号用リレーＩＬＣは付勢されず、その常開接点はオフのままであり、開閉器投入禁止解除コイルＬＣは励磁されない。このため仮設用開閉器３４のインターロックは解除されず、たとえ引き紐操作により投入を試みても該開閉器３４が非同期投入されることはない。
【００３１】
（５）図２は、仮設用開閉器３４の入，切操作を電気式とした実施の形態を説明するブロック図である。この実施の形態では開閉器入，切を従来技術通り引紐操作式のものを用いる代わりに、同期確認スイッチ１２を入れると、同期投入可能信号送出に連動して仮設用開閉器３４が自動投入するように構成したものである。前記図１のシステムに比べて、異電源同期投入用仮設開閉器が若干高価となるが、開閉器操作が全てスイッチ操作で済むなど、操作の自動化をより図ったものである。
【００３２】
図２において図１と異なる点は、前記同期条件解除スイッチ３７および開閉器投入禁止解除コイルＬＣの代わりに、制御電源５１に、スイッチ３８の常閉接点および同期投入可能信号用リレーＩＬＣの常開接点を介して接続された開閉器投入コイルＣＣと、制御電源５１に、スイッチ３８の前記常閉接点と連動する常開接点を介して接続された開閉器トリップコイルＴＣとを設けて仮設開閉部４１０および同期検出部４１１を構成し、両者を接続ケーブル６ｄ，６ｅ，６ｆ，６ｇで接続したことにあり、その他の部分は図１と同一に構成されている。尚３０ｃ〜３０ｊはブッシングである。
【００３３】
前記仮設開閉部４１０は、電圧検出器５０ａ，５０ｂ、開閉器投入コイルＣＣ、開閉器トリップコイルＴＣおよび仮設用開閉器３４を一体に構成している。前記同期検出部４１１は、目視確認用同期検定手段１１、同期確認スイッチ１２、同期投入可能判断回路３５、同期化信号発信装置３６、スイッチ３８および同期投入可能信号用リレーＩＬＣを一体に構成したものであり、配電柱下のオペレータの目線上に設置される。
【００３４】
このように同期検出部４１１の計器類を地上のオペレータの近くに設置することができるため、操作が非常に簡単化される。
【００３５】
このように構成されたシステムにおいて、同期投入可能判断回路３５で同期投入可能条件が成立したことが判断されると、同期投入可能信号用リレーＩＬＣが付勢されてその常開接点が閉じる。このため制御電源５１により開閉器投入コイルＣＣが励磁され、仮設用開閉器３４は自動的に投入される。また仮設用開閉器３４をトリップさせる場合は、スイッチ３８の常開接点をオンさせれば前記投入コイルＣＣは非励磁となるとともに、制御電源５１により開閉器トリップコイルＴＣが励磁され、仮設用開閉器３４がトリップする。
【００３６】
【実施例】
図３は、異電源間無停電切替システムの具体例を示し、（ａ）は従来のシステムによるもの、（ｂ）は本発明によるものである。図３（ａ）の仮設開閉器は図４の仮設用開閉器５、同期確認装置９を示しており、電源車は図４の並列運転機能付移動用発電装置を示している。図３（ａ）によれば仮設開閉器の直近で送電を行う必要がある。
【００３７】
また図３（ｂ）の仮設同期用開閉器は、図１、図２の仮設開閉部３１０，４１０を示し、復電操作ユニットは図１、図２の同期検出部３１１，４１１を示し、電源車は本発明の並列運転機能付移動用発電装置３３を示している。図３（ｂ）によれば、仮設開閉部から離れた場所からでも容易に送電を行うことができる。また複電操作ユニット（同期検出部３１１，４１１）を配電柱下のオペレータの目線上に設置することができるため、操作が非常に簡単化される。
【００３８】
さらに電圧検出器及び制御電源用として計器用変圧器を用いず、コンデンサ分圧による電圧検出器とバッテリーによる制御電源を用いているため、仮設開閉器を軽量化することができる。
【００３９】
尚、図１、図２では本発明を高圧配電系統に適用した場合を記載したが、これに限らず低圧配電系統においても使用機器類を低圧用に置き換えれば前記に準じて同等の作用効果が得られる。
【００４０】
【発明の効果】
以上のように本発明によれば、主電源である常用電源と負荷を結ぶ配電線の所定区間に介挿された区分開閉器と、前記常用電源とは異なる電源であり、前記区分開閉器の負荷側の配電線に、電源切り替え時に接続される電力供給用補助電源と、電源切り替え時に、前記区分開閉器に並列接続される仮設用開閉器とを備え、常用電源と電力供給用補助電源間の電源切り替えを、前記両電源の同期をとって無停電で行う異電源間無停電切替システムにおいて、
前記仮設用開閉器に、該開閉器の両端部に各々内蔵された電圧検出器と、前記電圧検出器を介して導入された電圧信号に基づいて常用電源と電力供給用補助電源の同期検定を行う同期検定手段と、蓄電池を制御電源とし、前記同期検定手段の出力信号と、常用電源および前記補助電源間の電位差、周波数差、位相差とに基づいて、前記仮設用開閉器の同期投入可能条件が成立したか否かを判断する同期投入可能判断回路と、前記同期投入可能条件未成立時に、常用電源を基準とする前記補助電源に対する同期化制御信号を作成するとともに、該同期化制御信号を所定の信号伝送手段によって前記補助電源に発信する同期化信号発信装置とを設け、
前記電力供給用補助電源に、前記同期化信号発信装置から発信された同期化信号を受信する同期化信号受信装置を設け、前記補助電源から常用電源への電源切り戻し時に、前記受信された同期化信号に基づいて自動的に同期化運転制御を行い、前記同期投入可能判断回路の同期投入可能条件成立時は、所定の投入手段によって前記仮設用開閉器を投入可能とするように構成したので、次のような優れた効果が得られる。
【００４１】
（１）発電装置側より配電線側への電源切り戻しに際し、従来、オペレータは仮設用開閉器側と発電装置側双方について、トランシーバ等によるやり取りや、それに基づく発電装置側手動同期化運転調整を必要としたが、本発明では仮設用開閉器側から自動同期指令を発すれば済む（発電装置側は自動同期化運転となる）。また、同期の確認は仮設用開閉器本体において確実に行われる。
【００４２】
（２）信号伝送手段が無線式の場合は、仮設用開閉器取付点と、移動用発電装置が離れていても（通常、双方装置間の離隔距離は、１００ｍ程度以下で十分であり、無線式でも十分対応できる範囲である）発電装置は自動同期化運転できる。このため、移動用発電装置は従来、路上駐車が多かったが、本発明によれば空地等に待避させて使用することが容易となる。
【００４３】
（３）発電装置側から配電線側への電源切り戻し時における発電装置同期化制御が、発電装置側主回路ケーブルが３本だけであるにも拘らず、復電してきた配電線電源と精度よく検出電圧間の比較が行えるため、確実な同期化制御が行える。
【００４４】
（４）本発明の最大の特長は、仮設用開閉器で非同期投入に対する回避機能が実現できたため、非同期投入による発電装置等の損傷の防止が図れたことにある。
【００４５】
（５）その他本発明のシステムは、既設高圧配電線を張り替えた場合の検相の確認にも使用することができる。
【００４６】
（６）さらに電圧検出器及び制御電源用として計器用変圧器を用いず、コンデンサ分圧による電圧検出器とバッテリーによる制御電源を用いているため、仮設開閉器を軽量化することができ、作業性が著しく向上する。
【００４７】
（７）仮設用開閉器には電圧検出器を内蔵しているので、検出電圧精度は従来技術のブッシング部の検電端子からの検出に比べて格段に良く、同期投入可能条件や同期化信号を作るにあたって、両電源側の電圧差，周波数差，位相差とも精度良く作成することができる。
【００４８】
（８）また、異電源同期投入用仮設開閉器を仮設開閉部と同期検出部に分離し、両者間をケーブルで接続することにより、同期検出部を配電柱下のオペレータの目線上に設置することができるため、操作が非常に簡単化される。
【００４９】
（９）また、電圧検出器を別置きとした場合は、汎用製品を組み合わせてシステムを構成することができ、非常に経済性が優位となる。
【図面の簡単な説明】
【図１】本発明の一実施形態例による異電源間無停電切替システムのブロック図。
【図２】本発明の他の実施形態例による異電源間無停電切替システムのブロック図。
【図３】異電源間無停電切替システムの概略を示し、（ａ）は従来装置のブロック図、（ｂ）は本発明のブロック図。
【図４】従来の異電源間無停電切替システムのブロック図。
【図５】従来の異電源間無停電切替システムのブロック図。
【符号の説明】
１…配電用変電所
２…配電線
３ａ，３ｂ…柱上区分開閉器
４…無停電救済負荷群
６ａ〜６ｇ…接続ケーブル
１１…同期検定手段
１２…同期確認スイッチ
３０ａ〜３０ｊ…ブッシング
３１，４１…異電源同期投入用仮設開閉器
３２…同期化信号受信装置
３３…並列運転機能付移動用発電装置
３４…仮設用開閉器
３５…同期投入可能判断回路
３６…同期化信号発信装置
３７…同期条件解除スイッチ
３８…スイッチ
５０ａ，５０ｂ…電圧検出器
５１…制御電源
３１０，４１０…仮設開閉部
３１１，４１１…同期検出部[0001]
BACKGROUND OF THE INVENTION
The present invention provides a different power source for uninterruptible power saving using a power supply auxiliary power source that temporarily differs from a normal power source for a load downstream from the work segment when performing a power outage work or the like in a part of a commercial distribution line. It is related to the uninterruptible UPS switching system.
[0002]
[Prior art]
As a conventional uninterruptible power switching system between different power sources, for example, there is a system of Japanese Utility Model No. 5-8766 shown in FIG. In this system, an auxiliary power supply (power supply car) for power supply was installed in the immediate vicinity of the temporary switch, and as many as six cables from the power supply car had to be connected live.
[0003]
In order to solve this problem, a conventional uninterruptible switching system between different power sources as shown in FIG. 4 has been proposed. In FIG. 4, 1 is a distribution substation, 2 is a commercial high-voltage distribution line, 3a and 3b are pole section switches inserted in the distribution line 2, and 4 is an uninterruptible relief load group. In the distribution line 2, between the distribution substation 1 and the pole section switch 3a is a direct substation section, between the pole section switches 3a and 3b is a blackout section, and the column section switch 3b and the uninterruptible relief load An uninterruptible relief section is defined between group 4 and the group 4. In addition, the location shown in the column top section switch 3b may be a temporary line opening portion (a portion to be cut and reconnected) in an edge winding line portion or the like.
[0004]
Prior to the power outage work, a temporary switch (also referred to as “construction switch”) 5 is connected to the distribution pole of the section switch, and the live connection parts 7a and 7b, the connection cables 6a and 6b, and the bushing with a detection terminal The live connection is made through 8a and 8b. Further, a synchronization confirmation device 9 is temporarily attached below the distribution pole and interconnected with the voltage detection terminals of the main circuit bushings 8a and 8b of the temporary switch 5 by a signal cable. In addition, 11 is a synchronous verification means, 12 is a synchronous confirmation switch. When the connection cables 6a and 6b connected to the bushing are in a charged state, the voltage detection terminal (electrode) generates a low-level potential by the capacitor voltage dividing action. The synchronization confirmation device 9 is made to function by detecting it.
[0005]
Therefore, at the start of the construction, first, the above-described devices are attached, the temporary switch 5 is closed, and the column-section switch 3b is opened. The opening / closing operation of the temporary switch 5 is generally performed by a handle operation using an attached pull string.
[0006]
In FIG. 4, reference numeral 13 denotes a moving power generator with a parallel operation function, which is an auxiliary power source connected to the distribution line 2 via the live line connecting portion 7 c, the connecting cable 6 c and the connecting connector 14. The power generator 13 includes a main circuit unit including a prime mover (PM) 15, an AC generator (AG) 16, an AC circuit breaker 17, and a disconnector 18, a synchronous control device 19, an automatic voltage regulator (AVR) 21, and a voltage setting. And a control circuit unit including a speed setting unit 23 and a speed governor (GOV) 24.
[0007]
Next, the moving generator 13 with a parallel operation function that is connected to the load side of the pole section switch 3b is started, and the synchronization control unit 19 performs synchronization control on the power generation side with respect to the distribution system. The AC circuit breaker 17 is used in parallel. Thereafter, if the temporary switch 5 is opened, the power generation device 13 continues to supply power to the uninterruptible relief load group 4. If the pole section switch 3a is also opened in the meantime, the power failure work between the switches 3a-3b of the distribution system can be carried out.
[0008]
After completion of the distribution line side construction, if the pole section switch 3a is turned on, the distribution system has returned to the power supply side of the temporary switch 5. At this time, the synchronization verification of the power source butt point is performed by visual confirmation with the synchronization verification means 11 (SY). If the frequency difference is large, the rotational speed is adjusted by operating the power generator 13 for movement while visually confirming the synchronization verification display, and it is driven to the specified frequency difference (determined by the slow speed of the phase difference change). If the temporary switch 5 is closed in the vicinity of the synchronization point (phase difference ≈ 0), it is possible to switch back from the power generation side to the distribution system side without interruption.
[0009]
[Problems to be solved by the invention]
In the system configured as described above, when the distribution line side power supply is restored to the power supply side terminal of the temporary switch 5 being opened in the main circuit after completion of the distribution line side construction, the switch load Since the power source of the power generator (13) is applied to the side terminal, the synchronization confirmation device 9 checks the frequency difference and phase difference between the two power sources and adjusts the frequency on the mobile power generator 13 side for synchronization. (Rotational speed adjustment) operation is required. The operation on the power generation device (13) side at this time is a manual operation (using a frequency increase or decrease switch or the like) while visually confirming the synchronization verification means 11 of the synchronization confirmation device 9.
[0010]
For this reason, when the temporary installation place of the synchronization confirmation device 9 and the power generation device 13 for movement (parking place) are slightly separated (usually 10 to 50 m apart), an operator is placed on both sides and a message is transmitted by a transceiver or the like. Since it is necessary to interact with each other, manpower is required, and since only the oral communication of both parties is relied on, reliable frequency adjustment work is difficult.
[0011]
In addition, since the voltage applied to the power supply side and the load side terminal of the temporary switch 5 is taken into the synchronization confirmation device 9 via the voltage detection terminals (8a, 8b), the voltage phase comparison of both can be easily performed. Since the voltage value itself has a large detection error, it is impossible to compare and confirm both voltage values. In other words, in order to synchronize between different power sources, it is necessary to (1) adjust the frequency, (2) adjust the voltage phase, and (3) adjust the voltage value. Therefore, the synchronization between different power sources is performed without confirmation. The power source on the distribution system side originally has a voltage fluctuation element of about ± 5% of the nominal voltage, and it is easily assumed that the power recovery voltage is different from the voltage before switching. Therefore, when the voltage matching is omitted for the sake of convenience, the synchronous power-on between the different power sources causes an excessive invalid cross current between the two power sources at the instant of power-on, and may cause damage to the power generator.
[0012]
As described above, in the prior art, the messenger between the devices (9, 13) is relied on manually, the phase difference is driven manually by the power generation device 13 side, and the temporary opening / closing is performed while visually checking the synchronization confirmation device 9 side. The entering operation is performed with the drawstring of the container 5. In this case, the phase difference is greatly deviated as a result of an operation delay due to manual pulling operation or a sudden load change on the power generator 13 side (generally, the allowable difference in phase difference is said to be within ± 10 °). In other words, an excessive cross current may cause fatal damage especially to the power generator 13 side, and this is a desirable system from a safety standpoint. hard.
[0013]
Furthermore, the biggest drawback of such an uninterruptible switching system between different power sources according to the prior art is that when an “on” operation is performed with the drawstring of the temporary switch 5, it is mechanically turned on except when it can be electrically synchronized. There is a system that cannot incorporate an interlock mechanism that makes it impossible (an interlock mechanism for preventing asynchronous loading cannot be installed).
[0014]
In order to solve the above problems, an uninterruptible switching system between different power sources shown in FIG. 5 has been proposed. In FIG. 5, the same parts as those in FIG. 4 are denoted by the same reference numerals. 5 differs from FIG. 4 in that instead of the temporary switch 5, the bushings 8 a and 8 b with detecting terminals, and the synchronization confirmation device 9, the connecting cable attaching / detaching bushings 30 a and 30 b and the different power source synchronous switching temporary switch 31, the synchronization signal receiving device 32 is provided in the power generation device 13 to configure the moving power generation device 33 with a parallel operation function, and the other parts are the same as those in FIG. 4.
[0015]
A temporary switch 31 for synchronously turning on different power supplies is a temporary switch 34 in which instrument transformers PT1 and PT2 are respectively incorporated at both ends, and a synchronization that performs a synchronization test based on voltage signals of the transformers PT1 and PT2. The verification means 11 (SY), the synchronization confirmation switch 12, the synchronous switch enable determination circuit 35 for determining whether the synchronous switch enable condition for the temporary switch 34 is satisfied, and the energization when the synchronous switch enable condition is satisfied A synchronization enabling signal relay ILC, a synchronization signal transmitting device 36 that generates a synchronization control signal when the synchronization enabling condition is not established, and transmits the synchronization control signal to the power generation device 33 as an automatic synchronization command, and the synchronization enabling possible When the signal relay ILC is energized, the normally open contact is closed, whereby a switch-on prohibition release coil LC excited by the instrument transformer PT1 as a power source, and the relay IL It is composed of a synchronization condition canceling switch 37 for parallel connected single power transmission to the normally open contact of.
[0016]
However, since the system shown in FIG. 5 is provided with voltage transformers PT1 and PT2 in the voltage detection means and the control power supply, the temporary switch is special, the mass is large, and the workability is very poor. That is, since the temporary switch is installed on a utility pole or the like, it is desired to reduce the weight for handling.
[0017]
The present invention has been made in view of the above points, and its object is to automate the synchronization operation adjustment of the mobile power generator and rely on the manual operation between the synchronization confirmation device on the temporary switch side and the mobile power generator. Between different power sources, which eliminates the need for communication and provides an interlock mechanism to prevent asynchronous charging of the temporary switch, to prevent damage to the power generator, etc., and to reduce the size and weight of the temporary switch It is to provide an uninterruptible switching system.
[0018]
[Means for Solving the Problems]
The present invention is a section switch inserted in a predetermined section of a distribution line that connects a load and a normal power supply that is a main power supply, and a power supply different from the regular power supply, the distribution switch on the load side of the section switch An auxiliary power supply for power supply connected at the time of power supply switching, and a temporary switch connected in parallel to the section switch at the time of power supply switching, the power supply switching between the normal power supply and the auxiliary power supply for power supply, In an uninterruptible switching system between different power sources that synchronizes both power sources and performs uninterruptible power,
(1) A voltage detector incorporated in each end of the switch in the temporary switch, and a normal power supply and a power supply auxiliary power supply based on a voltage signal introduced through the voltage detector. Synchronous verification means for performing synchronous verification, a storage battery as a control power supply, and based on the output signal of the synchronous verification means and the potential difference, frequency difference, phase difference between the normal power supply and the auxiliary power supply, the temporary switch of the temporary switch A synchronization enabling determination circuit for determining whether or not a condition for enabling synchronization can be established; and a synchronization control signal for the auxiliary power supply based on a normal power supply when the condition for enabling synchronization is not satisfied, and the synchronization A synchronization signal transmission device for transmitting a synchronization control signal to the auxiliary power source by a predetermined signal transmission means, and receiving the synchronization signal transmitted from the synchronization signal transmission device to the auxiliary power source for power supply The synchronization signal receiving apparatus provided, the at return power off to commercial power from the auxiliary power, automatically performs synchronization operation control based on the received synchronization signal, the synchronization-on of said synchronous-on allows determining circuit When the possible condition is satisfied, the temporary switch can be turned on by a predetermined turning means,
(2) The predetermined closing means is provided with a mechanism for canceling prohibition of the temporary switch when the synchronous switch enable determination condition is satisfied in the temporary switch, and the temporary switch is asynchronous. It is characterized by being able to prevent
(3) The predetermined closing means is provided with a switch closing coil that is energized when the synchronous closing enable condition of the synchronous closing enable determination circuit is satisfied, and the temporary closing switch is automatically turned on, in the temporary opening switch. It is characterized by
(4) The temporary switch is formed integrally with the voltage detector to form a temporary switch, and the synchronization verification means, the synchronization enabling determination circuit, and the synchronization signal transmission device are integrally formed. A synchronization detection unit is configured, and the temporary opening / closing unit and the synchronization detection unit are electrically connected via a cable, and a storage battery is used as a power source.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a functional block diagram showing an embodiment of the present invention. 1, the same parts as those in FIG. 5 are denoted by the same reference numerals. 1 differs from FIG. 5 in that a temporary switch 31 for synchronously turning on different power sources is connected to voltage detectors 50a and 50b, a temporary switch 34 instead of PT1 and PT2 as an instrument transformer, and an input prohibition release coil LC. A temporary opening / closing section 310, a synchronization detection means 11 (SY) for performing synchronization verification based on the voltage signal of the control power source 51 and the voltage detectors 50a and 50b for synchronization detection, and a synchronization confirmation switch 12 , And a synchronization detection unit 311 including a synchronization signal transmission device 36, a synchronization signal relay ILC, and a synchronization condition release switch 37. The other parts are the same as those in FIG. It is configured. Reference numerals 6d, 6e, and 6f are connection cables, and reference numerals 30c to 30h are connection cable attaching / detaching bushings.
[0020]
(1) The temporary switch 34 is provided with the following function as a temporary switch for synchronously turning on different power sources.
[0021]
(2) Although the function described below is incorporated in principle in the temporary switch 31 for different power supply synchronous input, as will be described later, the operator confirms the synchronization verification means 11 for visual confirmation and the synchronization confirmation switch 12 as necessary. To facilitate operation, remote monitoring and operation are possible using auxiliary signal cables to the hand under the distribution pole.
[0022]
(3) The characteristics of the temporary switch 31 for synchronously turning on different power sources are described as follows:
(B) The temporary switch 34 is provided with a closing prohibition release coil LC. In principle, the release coil LC is excited only when the synchronous closing enable condition is satisfied in the synchronous closing enable determination circuit 35, and the closing operation of the built-in switch 34 is prevented. Only when the mechanism is released and the condition for enabling synchronous input is satisfied, an input operation with a drawstring or the like is actually accepted. On the other hand, if the above-described electrical input enabling condition is not established, it cannot be mechanically input even if the operator performs an input operation using a drawstring or the like. Note that a separate synchronization condition release switch 37 is provided for power supply from the power source side (single power transmission) in the load-side no-voltage state.
[0023]
(B) When the synchronization confirmation switch 12 is turned on as the synchronization activation confirmation function, in addition to the synchronization verification means 11 for visual confirmation, the synchronization activation determination circuit 35 (voltage difference between the power supply side and load side applied power supply, frequency In addition, it detects the difference and phase difference and determines whether or not the conditions for enabling synchronization can be met. ) Synchronizing signal transmitting device for generating a synchronizing signal (a signal for increasing / decreasing the generating device voltage and a signal for increasing / decreasing the frequency) for the side power source (power generating device power source) and transmitting it to the power generating device 33 It consists of 36. It should be noted that during the period when the condition for enabling synchronization can be established, there is also a function of notifying the operator by performing external display as well.
[0024]
(C) In FIG. 1, the synchronization signal transmission device 36 is a wireless type in order to achieve wireless connection between the temporary switch 31 for synchronously turning on the different power source and the power generation device 33 for movement, A synchronization signal receiving device 32 (however, the signal transmission means may be a wire type signal cable or an optical fiber cable type by appropriately adapting the transmission / reception device from the viewpoint of economy and the like, or (It is also possible to use a coupling device (CC) to control by distribution line conveyance).
[0025]
(D) Further, as a feature of the temporary switch 31, the control power source for functioning the built-in devices described in (a) to (c) uses the battery (51). Compared to the detection from the detection terminals (8a, 8b in FIG. 4) of the bushing section of the prior art, the conditions for both the power sources are the same when making the conditions for enabling the synchronization and the synchronization signal described in (b) above. The voltage difference, frequency difference, and phase difference can be accurate.
[0026]
Further, the connecting cable attaching / detaching bushings 30a, 30b do not need to have a voltage detecting terminal.
[0027]
(E) The place where the temporary power switch 31 for synchronous power-on of the different power source is inserted into the distribution line is not limited to the pole section switch part on the track as in the case of the temporary switch of the prior art. Any location where the track can be temporarily opened may be used.
[0028]
(4) The moving power generation device 33 with a parallel operation function includes a synchronization signal receiving device 32 corresponding to the above, and when switching back from the power generation device 33 to the distribution line side after the distribution line side power supply is restored, synchronization between different power sources is performed. Synchronization control can be performed automatically by a signal from the synchronization signal transmitter 36 built in the temporary switch 31 for making up. Accordingly, during this time, the operator only needs to monitor and operate on the side of the temporary switch 31 for synchronously turning on the different power supply. As in the prior art example, the operator is arranged on both sides and does not communicate with each other using a transceiver or the like. You can do it.
[0029]
The device installation procedure of the entire system is in accordance with the prior art. However, when switching back to the distribution line, if the synchronization confirmation switch 12 is turned on at the temporary switch 31 side for different power supply synchronization as described above, the power generation device 33 side The operator automatically enters the synchronization operation, and the operator only needs to perform the switch entry operation (usually pulling operation) after confirming that the synchronization possible display is lit while monitoring the temporary switch side synchronization verification means 11 with a margin. In the unlikely event that synchronization is not possible, the entry operation will be locked, so you can operate with confidence.
[0030]
That is, when the synchronization enabling determination circuit 35 determines that the synchronization enabling condition is not satisfied, the synchronization enabling enable signal relay ILC is not energized, and the normally open contact remains off, and the switch is turned ON. The prohibition release coil LC is not excited. For this reason, the interlock of the temporary switch 34 is not released, and the switch 34 is not asynchronously turned on even if it is attempted to be turned on by a drawstring operation.
[0031]
(5) FIG. 2 is a block diagram illustrating an embodiment in which the on / off operation of the temporary switch 34 is electrical. In this embodiment, when the synchronization confirmation switch 12 is turned on instead of using a pull-operated type switch as in the prior art, the temporary switch 34 is automatically turned on in conjunction with the sending of a synchronization possible signal. It is comprised as follows. Compared with the system shown in FIG. 1, the temporary switch for synchronously turning on different power supplies is slightly more expensive, but the operation is further automated, for example, all the switches need only be operated by switches.
[0032]
2 differs from FIG. 1 in that, instead of the synchronous condition release switch 37 and the switch on / off prohibition release coil LC, the control power source 51 is connected to the normally closed contact of the switch 38 and the normally open contact enabling relay ILC. A temporary opening / closing part provided with a switch insertion coil CC connected via a contact and a switch trip coil TC connected via a normally open contact interlocking with the normally closed contact of the switch 38 to the control power source 51. 410 and the synchronization detection unit 411 are configured to be connected by connection cables 6d, 6e, 6f, and 6g, and other parts are configured in the same manner as in FIG. Reference numerals 30c to 30j are bushings.
[0033]
The temporary opening / closing unit 410 integrally includes voltage detectors 50a, 50b, a switch closing coil CC, a switch trip coil TC, and a temporary switch 34. The synchronization detection unit 411 includes a visual verification synchronization verification unit 11, a synchronization confirmation switch 12, a synchronization input enable determination circuit 35, a synchronization signal transmission device 36, a switch 38, and a synchronization input enable signal relay ILC. It is installed on the operator's line of sight below the distribution pole.
[0034]
As described above, since the instruments of the synchronization detector 411 can be installed near the operator on the ground, the operation is greatly simplified.
[0035]
In the system configured as described above, when it is determined by the synchronization enabling determination circuit 35 that the synchronization enabling condition is satisfied, the synchronization enabling signal relay ILC is energized and its normally open contact is closed. For this reason, the switch power supply coil 51 is excited by the control power source 51, and the temporary switch 34 is automatically turned on. When the temporary switch 34 is tripped, if the normally open contact of the switch 38 is turned on, the closing coil CC is de-energized, and the switch trip coil TC is excited by the control power source 51, so that the temporary switch is opened. The device 34 trips.
[0036]
【Example】
FIG. 3 shows a specific example of an uninterruptible power source switching system between different power sources, where (a) is based on a conventional system and (b) is based on the present invention. The temporary switch of FIG. 3A shows the temporary switch 5 and the synchronization confirmation device 9 of FIG. 4, and the power supply vehicle shows the mobile power generator with the parallel operation function of FIG. According to Fig.3 (a), it is necessary to transmit electric power in the immediate vicinity of a temporary switch.
[0037]
Also, the temporary synchronization switch shown in FIG. 3B shows the temporary opening / closing sections 310 and 410 shown in FIGS. 1 and 2, and the power recovery operation unit shows the synchronization detecting sections 311 and 411 shown in FIGS. The car shows the power generator 33 for movement with a parallel operation function of the present invention. According to FIG.3 (b), power transmission can be performed easily from the place away from the temporary opening / closing part. Further, since the double electric operation unit (synchronization detection units 311 and 411) can be installed on the operator's line of sight under the distribution pole, the operation is greatly simplified.
[0038]
Furthermore, since the voltage transformer and the control power supply using the battery are used for the voltage detector and the control power supply without using the instrument transformer, the temporary switch can be reduced in weight.
[0039]
1 and 2, the case where the present invention is applied to a high-voltage distribution system is described. However, the present invention is not limited to this, and if the equipment used is replaced with a low-voltage distribution system, the same operational effects can be obtained as described above. can get.
[0040]
【The invention's effect】
As described above, according to the present invention, a section switch inserted in a predetermined section of a distribution line that connects a main power supply that is a main power supply and a load, and a power supply different from the common power supply, A load-side distribution line is provided with an auxiliary power supply for power supply that is connected when the power is switched, and a temporary switch that is connected in parallel to the section switch when the power is switched, between the normal power supply and the auxiliary power supply for power supply In the uninterruptible switching system between different power sources, which performs the power switching of the two power sources in an uninterruptible manner,
In the temporary switch, a voltage detector built in both ends of the switch, and a synchronous test of the normal power supply and the auxiliary power supply based on the voltage signal introduced through the voltage detector. Synchronous input of the temporary switch based on the synchronization verification means to be performed and the storage battery as a control power supply, based on the output signal of the synchronization verification means and the potential difference, frequency difference, and phase difference between the normal power supply and the auxiliary power supply A synchronization input enabling determination circuit for determining whether or not a condition is satisfied, and a synchronization control signal for the auxiliary power supply based on a normal power supply when the synchronization enabling enable condition is not established, and the synchronization control signal A synchronizing signal transmitting device that transmits the auxiliary power to the auxiliary power source by a predetermined signal transmission means,
The power supply auxiliary power source is provided with a synchronization signal receiving device that receives a synchronization signal transmitted from the synchronization signal transmitting device, and the received synchronization is performed when the auxiliary power source is switched back to the normal power source. Since the synchronized operation control is automatically performed based on the activation signal, the temporary switch can be turned on by a predetermined closing means when the synchronization enabling condition is satisfied in the synchronization enabling determination circuit. The following excellent effects can be obtained.
[0041]
(1) When power is switched back from the power generator side to the distribution line side, conventionally, the operator has used a transceiver or the like for both the temporary switch side and the power generator side, and the power generator side manual synchronization operation adjustment based on it. Although it is necessary, in the present invention, it is only necessary to issue an automatic synchronization command from the temporary switch side (the power generation device side performs automatic synchronization operation). In addition, the confirmation of synchronization is reliably performed in the temporary switch body.
[0042]
(2) When the signal transmission means is wireless, even if the temporary switch attachment point and the moving power generator are separated (usually, the distance between the two devices is about 100 m or less, and wireless The power generator can be automatically synchronized. For this reason, the power generation device for movement has conventionally been frequently parked on the road, but according to the present invention, it can be easily used while being retracted in an open space.
[0043]
(3) Although the power generator synchronization control at the time of switching back the power from the power generator side to the distribution line side has only three power generator side main circuit cables, the power distribution power source and accuracy that have been restored Since the detection voltages can be compared well, reliable synchronization control can be performed.
[0044]
(4) The greatest feature of the present invention is that an avoidance function for asynchronous charging can be realized by a temporary switch, so that damage to the power generation device and the like due to asynchronous charging can be prevented.
[0045]
(5) Others The system of the present invention can also be used for confirmation of phase inspection when an existing high-voltage distribution line is replaced.
[0046]
(6) In addition, the voltage transformer and the control power supply are not used as an instrument transformer, but a voltage detector based on capacitor voltage and a control power supply using a battery are used. The property is significantly improved.
[0047]
(7) Since the temporary switch has a built-in voltage detector, the detection voltage accuracy is much better than the detection from the detection terminal of the bushing part of the prior art. In making this, the voltage difference, frequency difference, and phase difference on both power supply sides can be accurately created.
[0048]
(8) Also, the temporary switch for synchronously turning on different power sources is separated into a temporary switch and a sync detector, and the two are connected by a cable so that the sync detector is installed on the operator's line of view under the distribution pole. Operation is greatly simplified.
[0049]
(9) Further, when the voltage detector is provided separately, a system can be configured by combining general-purpose products, which is very economical.
[Brief description of the drawings]
FIG. 1 is a block diagram of an uninterruptible power switching system between different power sources according to an embodiment of the present invention.
FIG. 2 is a block diagram of an uninterruptible power supply switching system between different power sources according to another embodiment of the present invention.
FIG. 3 shows an outline of an uninterruptible power supply switching system between different power sources, (a) is a block diagram of a conventional device, and (b) is a block diagram of the present invention.
FIG. 4 is a block diagram of a conventional uninterruptible switching system between different power sources.
FIG. 5 is a block diagram of a conventional uninterruptible switching system between different power sources.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Distribution substation 2 ... Distribution line 3a, 3b ... Pillar top switch 4 ... Uninterruptible relief load group 6a-6g ... Connection cable 11 ... Synchronization verification means 12 ... Synchronization check switch 30a-30j ... Bushing 31,41 ... Temporary switch 32 for synchronously turning on different power supply ... Synchronizing signal receiving device 33 ... Power generator 34 for moving with parallel operation function ... Temporary switch 35 ... Synchronizing input possibility judging circuit 36 ... Synchronizing signal transmitting device 37 ... Synchronizing condition Release switch 38 ... Switches 50a, 50b ... Voltage detector 51 ... Control power supply 310,410 ... Temporary opening / closing parts 311,411 ... Synchronization detection part

Claims

A section switch inserted in a predetermined section of the distribution line connecting the main power supply and the main power supply and the load, and a power supply different from the regular power supply, and when the power is switched to the distribution line on the load side of the section switch A power supply auxiliary power supply, and a temporary switch connected in parallel to the section switch when switching the power supply, and the power supply switching between the normal power supply and the power supply auxiliary power supply is synchronized with the two power supplies. In the uninterruptible switching system between different power sources
In the temporary switch, a voltage detector built in both ends of the switch, and a synchronous verification of the power supply and the auxiliary power supply based on the voltage signal introduced through the voltage detector Synchronous input of the temporary switch can be performed based on the synchronization verification means to be performed and the storage battery as a control power supply, based on the output signal of the synchronization verification means and the potential difference, frequency difference, and phase difference between the normal power supply and the auxiliary power supply A synchronization enabling determination circuit for determining whether or not a condition is satisfied; and when the synchronization enabling condition is not satisfied, a synchronization control signal for the auxiliary power supply based on a normal power supply is created, and the synchronization control signal And a synchronized signal transmitting device for transmitting the auxiliary power to the auxiliary power by a predetermined signal transmission means,
The auxiliary power supply for power supply is provided with a synchronization signal receiving device that receives the synchronization signal transmitted from the synchronization signal transmitting device ,
When the power is switched back from the auxiliary power source to the regular power source, the synchronization operation control is automatically performed based on the received synchronization signal ,
An uninterruptible power source switching system between different power sources, wherein the temporary switch can be turned on by a predetermined turning-on means when the synchronous turn-on possible condition of the synchronous turn-on decision circuit is established.

The predetermined closing means is provided with a mechanism for releasing the prohibition of the temporary switch when the synchronous switch enable determination condition is established in the temporary switch, thereby preventing the temporary switch from being asynchronously inserted. The uninterruptible switching system between different power sources according to claim 1, wherein the switching system can be operated.

The predetermined closing means is provided with a switch closing coil that is excited when the synchronous closing enable condition of the synchronous closing enabling determination circuit is established and the temporary closing switch is automatically turned on to the temporary closing switch. The uninterruptible power supply uninterruptible switching system according to claim 1 characterized by the above-mentioned.

The temporary switch is formed integrally with a voltage detector to form a temporary switch, and the synchronization detector, a synchronization input determination circuit, and a synchronization signal transmitter are integrally formed to form a synchronization detector 4. The uninterruptible switching between different power sources according to claim 1, wherein the temporary opening and closing unit and the synchronization detecting unit are electrically connected via a cable and a storage battery is used as a power source. system.