JPH0583841A - Digital protective relay unit - Google Patents
Digital protective relay unitInfo
- Publication number
- JPH0583841A JPH0583841A JP3236670A JP23667091A JPH0583841A JP H0583841 A JPH0583841 A JP H0583841A JP 3236670 A JP3236670 A JP 3236670A JP 23667091 A JP23667091 A JP 23667091A JP H0583841 A JPH0583841 A JP H0583841A
- Authority
- JP
- Japan
- Prior art keywords
- current transformer
- signal
- auxiliary current
- switch
- input
- 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.)
- Pending
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Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、電力系統における三相
主回路の電気量のほか主変流器残留回路における残留回
路電流をも用いて該電力系統に関る保護リレー動作を行
う保護リレー装置であって、コンピュータを用いて保護
リレー演算等を行うディジタル保護リレー装置、特に、
残留回路電流変流用補助変流器及びこの変流器が出力す
る信号の処理系統としての残留回路信号処理系統の健全
性に対する点検ができかつこの点検装置の簡単化を図る
ことができるリレー装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protective relay for performing a protective relay operation relating to a power system by using not only the quantity of electricity of a three-phase main circuit in the power system but also the residual circuit current in a residual circuit of a main current transformer. A device, a digital protection relay device for performing a protection relay calculation and the like using a computer, in particular,
The present invention relates to an auxiliary current transformer for residual circuit current transformer and a relay device capable of inspecting the soundness of a residual circuit signal processing system as a signal processing system for the signal output from this current transformer and simplifying the inspection device. ..
【0002】[0002]
【従来の技術】上述の主回路において三相が平衡状態に
あると上記の残留回路電流は零であるから残留回路電流
変流用補助変流器及び残留回路信号処理系統が健全であ
るか否かを所定の点検装置を持たない保護リレー装置で
簡単に点検することは不可能で、このため、従来、図3
に構成を示したディジタル保護リレー装置1が採用され
ている。そうして、図3において、2r,2s,2tは
r,s,tの各相からなる三相主回路3に取り付けられ
かつ星形に接続されたいずれも主変流器、4,5,6は
それぞれの一次巻線4a,5a,6aが第2補助変流器
7の一次巻線7aを介して図示したY−Y接続となるよ
うに変流器2r,2s,2tに接続されたいずれも第1
補助変流器、Rr,Rs,Rt,は、変流器4,5,6
の各一次巻線としての第1一次巻線4a,5a,6aを
主変流器2r,2s,2tのそれぞれによって発生した
二次相電流Ir,Is,Itが流れることによって変流
器4,5,6の各二次巻線4b,5b,6bに生じる電
流をそれぞれ第1一次検出信号としての電圧Vr,V
s,Vtに変換するいずれも電流・電圧変換抵抗で、R
zは主変流器2r,2s,2tの残留回路に直列に接続
された変流器7の一次巻線としての第2一次巻線7aを
残留回路電流Izが流れることによって変流器7の二次
巻線7bに生じる電流を第2一次検出信号としての電圧
Vzに変化する電流・電圧変換抵抗である。2. Description of the Related Art In the above main circuit, when the three phases are in a balanced state, the above-mentioned residual circuit current is zero, so whether the auxiliary current transformer for residual circuit current transformation and the residual circuit signal processing system are sound or not. It is impossible to easily inspect the relay with a protective relay device that does not have a prescribed inspection device.
The digital protection relay device 1 having the configuration is adopted. Then, in FIG. 3, 2r, 2s, 2t are both attached to the three-phase main circuit 3 consisting of each phase of r, s, t and connected in a star shape. Reference numeral 6 is connected to the current transformers 2r, 2s, 2t such that the respective primary windings 4a, 5a, 6a are connected through the primary winding 7a of the second auxiliary current transformer 7 in the illustrated Y-Y connection. Both are first
The auxiliary current transformers Rr, Rs, Rt are current transformers 4, 5, 6
The primary phase windings 4a, 5a, 6a as the primary windings of the current transformers 4a, 5a, 6a are caused to flow by the secondary phase currents Ir, Is, It generated by the main current transformers 2r, 2s, 2t, respectively. The currents generated in the respective secondary windings 4b, 5b, 6b of 5, 6 are the voltages Vr, V as the first primary detection signals, respectively.
s and Vt are both current / voltage conversion resistors and R
z is the residual current Iz flowing through the second primary winding 7a as the primary winding of the current transformer 7 connected in series to the residual circuit of the main current transformers 2r, 2s, 2t. It is a current-voltage conversion resistor that changes the current generated in the secondary winding 7b into the voltage Vz as the second primary detection signal.
【0003】Fr,Fs,Ft,Fzは電圧Vr,V
s,Vt,Vzごとに目的周波数成分としての主回路3
の定格周波数fにほぼ等しい周波数成分の電圧を抽出す
るようにしたいずれもアナログフィルタ、8は入力され
る制御信号21cに応じて回路開閉動作をする開閉器9
を介して変流器7の三次巻線7cに点検用電流Iaを流
すようにした電流源、10は入力されたフィルタFr〜
Fzの各出力電圧を一個づつ順次出力する動作を繰り返
すマルチプレクサ11とこのマルチプレクサ11の出力
電圧をディジタル信号に変換するAD変換器12とから
なるAD変換部で、13はAD変換器12から出力され
るディジタル電圧信号に対して信号波形整形処理を行っ
て、第1一次検出信号Vr,Vs,Vtのそれぞれに対
応した信号である二次相電流Ir,Is,Itのそれぞ
れに対応した第1二次検出信号13r,13s,13t
と、第2一次検出信号Vzに対応した信号である残留回
路電流Izに対応した第2二次検出信号13zとを出力
する信号波形整形部である。Fr, Fs, Ft and Fz are voltages Vr and V
Main circuit 3 as a target frequency component for each of s, Vt, and Vz
Is a analog filter that extracts a voltage component having a frequency component substantially equal to the rated frequency f of the switch, and 8 is a switch 9 that opens and closes the circuit according to the input control signal 21c.
The current source 10 is configured to flow the inspection current Ia through the tertiary winding 7c of the current transformer 7 via the
An A / D conversion unit is composed of a multiplexer 11 that repeats the operation of sequentially outputting each output voltage of Fz one by one, and an AD converter 12 that converts the output voltage of the multiplexer 11 into a digital signal, and 13 is output from the AD converter 12. Signal waveform shaping processing is performed on the digital voltage signal corresponding to the first primary detection signal Vr, Vs, Vt, which is a signal corresponding to each of the secondary phase currents Ir, Is, It. Next detection signals 13r, 13s, 13t
And a second secondary detection signal 13z corresponding to the residual circuit current Iz, which is a signal corresponding to the second primary detection signal Vz.
【0004】14はフィルタFr,Fs,Ft,Fzと
AD変換部10と波形整形部13とからなる信号処理
部、15は入力される第3制御信号21aに応じて回路
開閉動作をする第3開閉器16と、検出信号13r,1
3s,13tがいずれも直接入力されかつ検出信号13
zが開閉器16を介して入力されかつ信号13r,13
s,13t,13zを用いて保護リレー演算を行ってこ
の演算結果に応じた少なくとも一個のトリップ信号17
aを出力する演算部本体17とからなるリレー演算部
で、18は第2二次検出信号13zが入力され、かつこ
の信号13zが入力されている状態で第4制御信号21
bが入力されると信号13zの実効値Szを算出する実
効値算出演算動作を実効値算出部19で行った後、この
演算結果を所定の基準値K1と比較してこの比較結果に
応じた点検信号20aを出力する比較演算動作を比較演
算部20で行う残留回路電流監視部である。そうして、
ここに、信号20aは、Sz≧K1であると演算部20
が判定すると「0」の値を呈し、Sz<K1であると演
算部20が判定すると「1」の値を呈する二値信号であ
る。21は点検開始信号22が入力されると第3制御信
号21aと第4制御信号21bと第5制御信号21cと
を所定の手順で出力しまたは消滅させる一連の制御信号
出力動作A1を一回行う制御信号出力部で、この場合制
御信号出力動作A1は、第3乃至第5制御信号21a,
21b,21cによって、開閉器16が開いている時間
帯の途中の時間帯の間開閉器9が閉状態になり、かつ開
閉器9が閉状態にある時間帯の途中の時間帯の間に監視
部18における上述した実効値算出演算動作と比較演算
動作とからなる残留回路電流監視動作Bが始まって終了
するように開閉器9,16と監視部18とが動作するよ
うにする信号出力動作である。そうして、前述したディ
ジタル保護リレー装置1は、主回路3を除く図3図示の
各部で構成されている。Reference numeral 14 is a signal processing section comprising filters Fr, Fs, Ft, Fz, an AD conversion section 10 and a waveform shaping section 13, and 15 is a third circuit opening / closing circuit according to an input third control signal 21a. Switch 16 and detection signals 13r, 1
Both 3s and 13t are directly input and the detection signal 13
z is input via switch 16 and signals 13r, 13
s, 13t, 13z is used to perform a protection relay operation, and at least one trip signal 17 depending on the operation result.
A relay operation unit including an operation unit main body 17 that outputs a, and 18 receives a second secondary detection signal 13z, and a fourth control signal 21 while the signal 13z is being input.
When b is input, an effective value calculation operation for calculating the effective value Sz of the signal 13z is performed in the effective value calculation unit 19, and then the calculated result is compared with a predetermined reference value K1 and the comparison result is obtained. This is a residual circuit current monitoring unit in which the comparison calculation unit 20 performs the comparison calculation operation for outputting the inspection signal 20a. And then
Here, the signal 20a indicates that Sz ≧ K1 and the arithmetic unit 20
Is a binary signal that exhibits a value of "0" when Sz <K1 and the operation unit 20 determines that Sz <K1 has a value of "1". When the inspection start signal 22 is input, 21 performs once a series of control signal output operation A1 for outputting or extinguishing the third control signal 21a, the fourth control signal 21b, and the fifth control signal 21c in a predetermined procedure. In the control signal output section, the control signal output operation A1 in this case is performed by the third to fifth control signals 21a,
By 21b and 21c, the switch 9 is closed during the time period during which the switch 16 is open, and is monitored during the time period during which the switch 9 is closed. A signal output operation for operating the switches 9, 16 and the monitoring unit 18 so that the residual circuit current monitoring operation B including the above-described effective value calculation operation and comparison operation in the section 18 starts and ends. is there. Then, the digital protection relay device 1 described above is configured by the respective parts shown in FIG. 3 except the main circuit 3.
【0005】[0005]
【発明が解決しようとする課題】保護リレー装置1では
各部が上述のように構成されているほか、この装置1の
各部が健全でかつ主回路3が三相平衡状態にある状態
で、電流源8と開閉器9とによって変流器三次巻線7c
に点検用電流Iaを流した時、前述の実効値SzがSz
≧K1を満足するように電流Iaが設定されている。し
たがって、このリレー装置1では、回路3が三相平衡状
態にある時制御信号出力部21に点検開始信号22を入
力して点検信号20aの状態を観察することによって、
残留回路電流変流用補助変流器としての変流器7と、信
号処理部14の中の検出信号Vzから検出信号13zを
得る動作を行う部分と抵抗Rzとからなる残留回路信号
処理系統23とが健全であるか否かを簡単に点検し得る
ことが明らかであるが、この点検の場合、電流Iaを巻
線7cに流すようにしているので、巻線7aの断線,短
絡等の異常は信号20aによっては検出できないという
問題点がある。そうして、また、この場合、上述した電
流源8と巻線7cとが必要であるから、これら両者と開
閉器9及び16と監視部18と制御信号出力部21とか
らなる、補助変流器7及び上述の信号処理系統23に対
する点検装置24の構成が複雑であるという問題点もあ
る。本発明の目的は、電流源8及び巻線7cを設けなく
ても主回路3が平衡状態にある時に残留回路電流Izを
一次巻線7aに通流させることができるようにして、変
流器7と信号処理系統23とに対する健全性の点検を一
次巻線7aを除外することなく一括して行うことができ
るようにし、かつこの点検を行う点検装置の構成が簡単
になるようにすることにある。In the protection relay device 1, each part is constructed as described above, and in addition, when each part of the device 1 is sound and the main circuit 3 is in the three-phase balanced state, the current source is 8 and switch 9 form a current transformer tertiary winding 7c
When the inspection current Ia is applied to the
The current Ia is set so as to satisfy ≧ K1. Therefore, in this relay device 1, when the circuit 3 is in the three-phase balanced state, by inputting the inspection start signal 22 to the control signal output unit 21 and observing the state of the inspection signal 20a,
A current transformer 7 as an auxiliary current transformer for residual circuit current flow, and a residual circuit signal processing system 23 including a portion for performing operation of obtaining a detection signal 13z from the detection signal Vz in the signal processing unit 14 and a resistor Rz. It is clear that it can be easily inspected whether or not is sound, but in this inspection, since the current Ia is made to flow through the winding 7c, there is no abnormality such as disconnection or short circuit of the winding 7a. There is a problem that it cannot be detected depending on the signal 20a. In addition, since the current source 8 and the winding 7c described above are required in this case, the auxiliary current transformation including these two, the switches 9 and 16, the monitoring unit 18, and the control signal output unit 21. There is also a problem that the configuration of the inspection device 24 for the instrument 7 and the signal processing system 23 described above is complicated. An object of the present invention is to allow the residual circuit current Iz to flow through the primary winding 7a when the main circuit 3 is in a balanced state without providing the current source 8 and the winding 7c, and thus a current transformer. 7 and the signal processing system 23 can be collectively checked for soundness without excluding the primary winding 7a, and the structure of an inspection device for performing this check can be simplified. is there.
【0006】[0006]
【課題を解決するための手段】上記目的を達成するた
め、本発明によれば、三相主回路に取り付けられそれぞ
れ一端が共通接続されて星形に接続された三個の主変流
器と、この主変流器にそれぞれ対応して設けられ各一次
巻線の一端が前記主変流器の他端にそれぞれ接続された
三個の第1補助変流器と、一端が前記第1補助変流器の
各一次巻線の他端に接続され他端が前記主変流器の共通
接続点に接続された第2補助変流器とを備え、前記第1
補助変流器および第2補助変流器の各二次巻線の出力信
号に基づいて保護リレー動作を行なうディジタル保護リ
レー装置において、点検時には前記三個の第1補助変流
器の内1個を切離して、前記第2補助変流器の二次巻線
の出力信号に基づいて点検動作を行なうと共に、前記第
2補助変流器の二次巻線の出力信号に基づく保護リレー
動作を停止することを特徴とする。さらに、本発明の実
施例によれば、1)三相主回路に取り付けられかつ星形
に接続された三個の主変流器と、前記主変流器のそれぞ
れに対応する都合三個の第1補助変流器と、第2補助変
流器と、入力される第1制御信号に応じて回路開閉動作
をする第1開閉器と、入力される第2制御信号に応じて
回路開閉動作をする第2開閉器とが設けられ、かつ前記
第1補助変流器ごとにこの第1補助変流器に対応する前
記主変流器に該第1補助変流器の一次巻線としての第1
一次巻線の一端が接続され、かつ前記第2補助変流器の
一次巻線としての第2一次巻線の一端が前記主変流器の
中性点に接続され、かつ前記第2一次巻線の他端が任意
の一個の前記第1補助変流器としての特定補助変流器に
おける前記第1一次巻線の他端に前記第1開閉器を介し
て接続されると共に前記特定補助変流器を除く二個の前
記第1補助変流器の各々における前記第1一次巻線の各
他端に直接接続され、かつ前記特定補助変流器における
前記第1一次巻線の他端が前記第2開閉器を介して前記
中性点に接続されることによって、前記第1補助変流器
の各二次巻線からこの二次巻線に対応した前記第1一次
巻線を流れる二次相電流に応じたアナログ信号としての
第1一次検出信号を出力すると共に前記第2補助変流器
の二次巻線から前記第2一次巻線を流れる残留回路電流
に応じたアナログ信号としての第2一次検出信号を出力
するリレー入力部と、都合三個の前記第1一次検出信号
のそれぞれと前記第2一次検出信号との各々について目
的周波数成分抽出、AD変換、信号波形整形の各信号処
理を順次行って前記二次相電流のそれぞれに対応した都
合三個の第1二次検出信号と前記残留回路電流に対応し
た第2二次検出信号とを出力する信号処理部と、入力さ
れる第3制御信号に応じて回路開閉動作をする第3開閉
器が設けられ、かつすべての前記第1二次検出信号が直
接入力され、かつ前記第2二次検出信号が前記第3開閉
器を介して入力され、かつ前記両二次検出信号を用いて
保護リレー演算を行ってこの演算結果に応じた少なくと
も一個のトリップ信号を出力するリレー演算部と、前記
第2二次検出信号が入力され、かつこの第2二次検出信
号が入力されている状態で第4制御信号が入力されると
前記第2二次検出信号の実効値を算出する実効値算出演
算動作とこの演算結果を所定の基準値と比較してこの比
較結果に応じた点検信号を出力する比較演算動作とから
なる残留回路電流監視動作を行う残留回路電流監視部
と、点検開始信号が入力されると前記第1乃至第4制御
信号を所定の手順で出力しまたは消滅させる一連の制御
信号出力動作を一回行う制御信号出力部とを備え、前記
制御信号出力動作は、前記第3開閉器が開いている時間
帯の途中の時間帯の間前記第2開閉器が閉状態になり、
かつ前記第2開閉器が前記閉状態にある時間帯の途中の
時間帯の間前記第1開閉器が開状態になり、かつ前記第
1開閉器が前記開状態にある時間帯の途中の時間帯の間
に前記残留回路電流監視動作が始まって終了するよう
に、前記第1乃至第3開閉器と前記残留回路電流監視部
とが前記第1乃至第4制御信号によって動作するように
する信号出力動作であるようにディジタル保護リレー装
置を構成し、また、2)上記1)項に記載のレリー装置
において、点検開始信号は制御信号出力部に周期的に入
力される信号であるようにディジタル保護リレー装置を
構成し、また、3)上記1)項または上記2)項のいず
れかに記載のリレー装置において、第1及び第2一次検
出信号はいずれも第1及び第2補助変流器のそれぞれに
よって変流された電流を電圧に変換して得た電圧信号で
あるようにディジタル保護リレー装置を構成する。To achieve the above object, according to the present invention, there are provided three main current transformers which are attached to a three-phase main circuit and are commonly connected at one end thereof and connected in a star shape. , Three first auxiliary current transformers provided corresponding to the main current transformers, one end of each primary winding of which is connected to the other end of the main current transformer, and one end of which is the first auxiliary current transformer A second auxiliary current transformer connected to the other end of each primary winding of the current transformer, the other end of which is connected to a common connection point of the main current transformer,
In a digital protection relay device that performs a protection relay operation based on the output signal of each secondary winding of the auxiliary current transformer and the second auxiliary current transformer, one of the three first auxiliary current transformers is inspected at the time of inspection. Is disconnected to perform an inspection operation based on the output signal of the secondary winding of the second auxiliary current transformer, and stop the protection relay operation based on the output signal of the secondary winding of the second auxiliary current transformer. It is characterized by doing. Further, according to the embodiment of the present invention, 1) three main current transformers mounted in a three-phase main circuit and connected in a star shape, and three main current transformers corresponding to each of the main current transformers are provided. A first auxiliary current transformer, a second auxiliary current transformer, a first switch that performs a circuit opening / closing operation according to an input first control signal, and a circuit opening / closing operation according to an input second control signal And a second switch that operates as a primary winding of the first auxiliary current transformer to the main current transformer corresponding to the first auxiliary current transformer for each of the first auxiliary current transformers. First
One end of a primary winding is connected, one end of a second primary winding as a primary winding of the second auxiliary current transformer is connected to a neutral point of the main current transformer, and the second primary winding is connected. The other end of the wire is connected to the other end of the first primary winding of the arbitrary specific auxiliary current transformer as the first auxiliary current transformer via the first switch, and the specific auxiliary current transformer is connected. The first primary winding of each of the two first auxiliary current transformers except the current transformer, and the other end of the first primary winding of the specific auxiliary current transformer is directly connected to the other end of the first primary winding. By connecting to the neutral point via the second switch, each secondary winding of the first auxiliary current transformer flows through the first primary winding corresponding to the secondary winding. The first primary detection signal as an analog signal corresponding to the next phase current is output and the secondary winding of the second auxiliary current transformer is connected to the front side. A relay input section that outputs a second primary detection signal as an analog signal according to the residual circuit current flowing through the second primary winding, and each of the three first primary detection signals for convenience and the second primary detection signal. Signal processing such as target frequency component extraction, AD conversion, and signal waveform shaping is sequentially performed for each of the three, and the corresponding three first secondary detection signals corresponding to each of the secondary phase currents and the residual circuit current are handled. A signal processing unit that outputs the second secondary detection signal and a third switch that opens and closes the circuit according to the input third control signal are provided, and all the first secondary detection signals are directly At least one trip signal that is input and that the second secondary detection signal is input through the third switch, and that performs protection relay calculation using both the secondary detection signals and that corresponds to the calculation result. To output -The arithmetic unit and the second secondary detection signal are input, and when the fourth control signal is input in the state where the second secondary detection signal is input, the effective value of the second secondary detection signal A residual circuit current monitoring unit for performing a residual circuit current monitoring operation including an effective value calculation calculation operation for calculating and a comparison calculation operation for comparing the calculation result with a predetermined reference value and outputting an inspection signal according to the comparison result. And a control signal output section that once performs a series of control signal output operations for outputting or extinguishing the first to fourth control signals in a predetermined procedure when an inspection start signal is input. The operation is such that the second switch is in a closed state during a time zone in the middle of the time zone in which the third switch is open,
And a time in the middle of the time period in which the first switch is in the open state during a time period in the middle of the time period in which the second switch is in the closed state A signal that causes the first to third switches and the residual circuit current monitoring unit to operate according to the first to fourth control signals so that the residual circuit current monitoring operation starts and ends during the band. The digital protection relay device is configured to perform an output operation, and 2) in the relay device described in 1) above, the inspection start signal is digital so that it is a signal periodically input to the control signal output unit. 3) In the relay device according to any one of 1) or 2) above, the first and second primary detection signals are both first and second auxiliary current transformers. Electric currents transformed by each of Constituting the digital protective relay device to be a voltage signal obtained by converting the voltage.
【0007】[0007]
【作用】上記のように構成すると、いずれの保護リレー
装置の場合にも、制御信号出力部が行う制御信号出力動
作によって、三相主回路が平衡状態にある場合に三個の
主変流器の残留回路を構成する第2一次巻線に特定補助
変流器における第1一次巻線を除く他の二個の第1一次
巻線のそれぞれを流れる都合二個の二次相電流の和電流
を、リレー演算部の動作に大きい影響を及ぼすことな
く、流すようにすることができ、さらにこの和電流にも
とづく第2二次検出信号の大きさを残留回路電流監視部
が出力する点検信号によって点検することができて、こ
の場合前述した電流源8及び三次巻線7cが不要である
から、第2補助変流器とこの変流器に連なる上述の残留
回路信号処理系統23とに対する健全性の点検を第2一
次巻線を除外することなく一括して行うことができ、か
つこの点検を行う点検装置の構成が簡単になるディジタ
ル保護リレー装置が得られることになる。With the above construction, in any protection relay device, three main current transformers are provided when the three-phase main circuit is in a balanced state by the control signal output operation performed by the control signal output section. Of the secondary auxiliary current of the specific auxiliary current transformer other than the first primary winding of the specific auxiliary current transformer, the total current of the two secondary phase currents flowing through each of the other two primary primary windings. Can be made to flow without significantly affecting the operation of the relay calculation unit, and the magnitude of the second secondary detection signal based on this sum current can be changed by the inspection signal output by the residual circuit current monitoring unit. Since it can be inspected and the current source 8 and the tertiary winding 7c described above are unnecessary in this case, the soundness of the second auxiliary current transformer and the above-mentioned residual circuit signal processing system 23 connected to this current transformer is sound. Check for the exclusion of the secondary primary winding No it can be performed collectively, and configuration of the inspection apparatus for performing this inspection is that the digital protection relay device becomes simple to obtain.
【0008】[0008]
【実施例】図1は本発明の一実施例の構成説明図で、本
図においては図3におけるものと同じものに図3の場合
と同じ符号がつけてある。そうして、図1において、2
5は一次巻線としての第2一次巻線25aと二次巻線2
5bとを有し、かつ巻線25aに残留回路電流Izが流
れることによって電流・電圧変換抵抗Rzを図示のよう
に接続した二次巻線25bから電圧Vzとしての第2一
次検出信号を出力するようにした、前述の変流器7に対
応した第2補助変流器、26は入力される第1制御信号
29aに応じて回路開閉動作をする第1開閉器、27は
入力される第2制御信号29aに応じて回路開閉動作を
する第2開閉器で、28は主変流器2r,2s,2tと
第1補助変流器4,5,6と変流器25と開閉器26及
び27と抵抗Rr,Rs,Rt,Rzとが図示のように
接続されてなるリレー入力部である。29は点検開始信
号22が入力されると第1制御信号29aと第2制御信
号29bと第3制御信号21aと第4制御信号21bと
を所定の手順で出力しまたは消滅させる一連の制御信号
出力動作A2を一回行う、前述の制御信号出力部21に
対応した制御信号出力部で、この制御信号出力動作A2
は、図2に示したように、第3開閉器16が開いている
時間帯T1の途中の時間帯T2の間第2開閉器27が閉
状態になり、かつ開閉器27が閉状態にある時間帯T2
の途中の時間帯T3の間第1開閉器26が開状態にな
り、かつ開閉器26が開状態にある時間帯T3の途中の
時間帯T4の間に残留回路電流監視動作Bが始まって終
了するように、開閉器16,26,27と残留回路電流
監視部18とが信号29a,29b,21a,21bに
よって動作するようにする信号出力動作である。30は
主回路3を除く図1図示の各部からなるディジタル保護
リレー装置である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory view of the structure of an embodiment of the present invention. In this figure, the same parts as those in FIG. Then, in FIG.
5 is a second primary winding 25a as a primary winding and a secondary winding 2
5b and the residual circuit current Iz flows through the winding 25a to output the second primary detection signal as the voltage Vz from the secondary winding 25b to which the current / voltage conversion resistor Rz is connected as shown in the figure. The second auxiliary current transformer corresponding to the above-mentioned current transformer 7, 26 is a first switch that opens and closes the circuit in response to the input first control signal 29a, and 27 is a second input. A second switch that opens and closes the circuit in response to the control signal 29a, and 28 is a main current transformer 2r, 2s, 2t, a first auxiliary current transformer 4, 5, 6, a current transformer 25, a switch 26, and 27 is a relay input section in which resistors 27, Rr, Rs, Rt, and Rz are connected as shown in the figure. 29 is a series of control signal outputs for outputting or extinguishing the first control signal 29a, the second control signal 29b, the third control signal 21a, and the fourth control signal 21b in a predetermined procedure when the inspection start signal 22 is input. This control signal output operation A2 is performed by the control signal output unit corresponding to the control signal output unit 21 that performs the operation A2 once.
2, as shown in FIG. 2, the second switch 27 is in the closed state and the switch 27 is in the closed state during the time period T2 in the middle of the time period T1 in which the third switch 16 is open. Time zone T2
The first switch 26 is in the open state during the time zone T3 in the middle of the period, and the residual circuit current monitoring operation B is started and ended during the time zone T4 in the middle of the time zone T3 in which the switch 26 is in the open state. As described above, the switch 16, 26, 27 and the residual circuit current monitor 18 are operated to output signals 29a, 29b, 21a, 21b. Reference numeral 30 denotes a digital protection relay device including the respective parts shown in FIG. 1 except the main circuit 3.
【0009】リレー装置30は上述のように構成されて
いて、制御信号出力部29に点検開始信号22が入力さ
れない時開閉器26は閉、開閉器27は開、開閉器16
は閉となっているのでリレー演算部15は正規の保護リ
レー演算を行い得る状態にあり、この時主回路3が三相
平衡状態にあると、二次相電流IrをIとしかつaをa
=exp(j2π/3)としてIr=I,Is=a2I,
It=aIの関係があるからIrとIsとItとの和で
ある残留回路電流Izは零となっている。ところが、こ
の場合、信号出力部29から信号29a,29b,21
aを出力することによって図2における時間帯T3の状
態を出現させると、この時Iz=Ir+It=(1+
a)・Iとなるから実効値が電流Irのそれに等しくか
つIrに対して60度進み位相の電流Izが巻線25a
に流れることになって、この場合変流器25及び前述し
た残留回路信号処理系統23が共に健全であるとIzに
対応した検出信号13zの実効値Szが基準値K2に対
して常にSz≧K2となるように比較演算20における
基準値K2が設定されており、さらに、Sz≧K2であ
ると信号20aの値を「0」にしSz<K2であると信
号20aの値を「1」にするように演算部20が構成さ
れている。そうして、このリレー装置30では、上述し
たように、図2における時間帯T4の間に監視動作Bが
行われ、この時検出信号13zがリレー演算部15の演
算部本体17に入力されることはない。The relay device 30 is constructed as described above. When the inspection start signal 22 is not input to the control signal output section 29, the switch 26 is closed, the switch 27 is open, and the switch 16 is opened.
Is closed, the relay calculator 15 is in a state in which it can perform a normal protection relay calculation. If the main circuit 3 is in a three-phase balanced state at this time, the secondary phase current Ir is set to I and a is set to a.
= Exp (j2π / 3), Ir = I, Is = a 2 I,
Because of the relationship of It = aI, the residual circuit current Iz, which is the sum of Ir, Is, and It, is zero. However, in this case, the signals 29a, 29b, 21 are output from the signal output unit 29.
When the state of the time zone T3 in FIG. 2 appears by outputting a, Iz = Ir + It = (1+
a) · I, the effective value is equal to that of the current Ir and the current Iz having a phase leading by 60 degrees with respect to Ir is the winding 25a.
In this case, if the current transformer 25 and the residual circuit signal processing system 23 described above are both sound, the effective value Sz of the detection signal 13z corresponding to Iz is always Sz ≧ K2 with respect to the reference value K2. The reference value K2 in the comparison calculation 20 is set so that the value of the signal 20a is “0” when Sz ≧ K2, and the value of the signal 20a is “1” when Sz <K2. The arithmetic unit 20 is configured as described above. Then, in the relay device 30, as described above, the monitoring operation B is performed during the time zone T4 in FIG. 2, and at this time, the detection signal 13z is input to the arithmetic unit body 17 of the relay arithmetic unit 15. There is no such thing.
【0010】すなわち、リレー装置30においては、信
号出力部29が行う制御信号出力動作A2によって、主
回路3が三相平衡状態にある場合に主変流器2r,2
s,2tの残留回路を構成する巻線25aに和電流(I
r+It)をリレー演算部本体17の動作に大きい影響
を及ぼすことなく流すようにすることができ、さらにこ
の和電流(Ir+It)にもとづく信号13zの大きさ
を点検信号20aによって点検することができ、かつこ
の場合開閉器26,27,16と監視部18と信号出力
部29とで前述の点検装置24に対応した点検装置31
が構成されていることが明らかで、したがって、リレー
装置30が、変流器25と残留回路信号処理系統23と
に対する健全性の点検を両者一括してかつ一次巻線25
aを除外することなく行うことができてしかもこの点検
を行う点検装置31が前述の点検装置24よりも簡単な
構成のリレー装置となっていることがまた明らかであ
る。上述の実施例ではIz=Ir+Itとなるように開
閉器26,27を接続したが、本発明はIz=Ir+I
sとなるかまたはIz=Is+Itとなるように開閉器
26,27を接続してもよいものであり、また、上述の
実施例では点検開始信号22が適当な時刻に制御信号出
力部29に入力されるようにしたが、本発明は信号22
が信号出力部29に周期的に入力されるようにしてもよ
いものである。That is, in the relay device 30, by the control signal output operation A2 performed by the signal output unit 29, the main current transformers 2r, 2 when the main circuit 3 is in the three-phase balanced state.
In the winding 25a that forms the residual circuit of s, 2t, the sum current (I
r + It) can be made to flow without significantly affecting the operation of the relay arithmetic unit body 17, and the magnitude of the signal 13z based on this sum current (Ir + It) can be checked by the check signal 20a. Further, in this case, the inspection device 31 corresponding to the above-described inspection device 24 is formed by the switches 26, 27, 16 and the monitoring unit 18 and the signal output unit 29.
Therefore, the relay device 30 checks the soundness of the current transformer 25 and the residual circuit signal processing system 23 together and the primary winding 25.
It is also clear that the inspection device 31 which can be carried out without excluding a and is a relay device having a simpler configuration than the above-mentioned inspection device 24. In the above embodiment, the switches 26 and 27 are connected so that Iz = Ir + It. However, according to the present invention, Iz = Ir + I.
The switches 26 and 27 may be connected so that s or Iz = Is + It. In the above embodiment, the inspection start signal 22 is input to the control signal output unit 29 at an appropriate time. However, according to the present invention, the signal 22
May be periodically input to the signal output unit 29.
【0011】[0011]
【発明の効果】上述したように、本発明においては、三
相主回路に取り付けられそれぞれ一端が共通接続されて
星形に接続された三個の主変流器と、この主変流器にそ
れぞれ対応して設けられ各一次巻線の一端が前記主変流
器の他端にそれぞれ接続された三個の第1補助変流器
と、一端が前記第1補助変流器の各一次巻線の他端に接
続され他端が前記主変流器の共通接続点に接続された第
2補助変流器とを備え、前記第1補助変流器および第2
補助変流器の各二次巻線の出力信号に基づいて保護リレ
ー動作を行なうディジタル保護リレー装置において、点
検時には前記三個の第1補助変流器の内1個を切離し
て、前記第2補助変流器の二次巻線の出力信号に基づい
て点検動作を行なうと共に、前記第2補助変流器の二次
巻線の出力信号に基づく保護リレー動作を停止すること
を特徴とする。さらに、本発明の実施例によれば、1)
三相主回路に取り付けられかつ星形に接続された三個の
主変流器と、前記主変流器のそれぞれに対応する都合三
個の第1補助変流器と、第2補助変流器と、入力される
第1制御信号に応じて回路開閉動作をする第1開閉器
と、入力される第2制御信号に応じて回路開閉動作をす
る第2開閉器とが設けられ、かつ第1補助変流器ごとに
この第1補助変流器に対応する主変流器に該第1補助変
流器の一次巻線としての第1一次巻線の一端が接続さ
れ、かつ第2補助変流器の一次巻線としての第2一次巻
線の一端が主変流器の中性点に接続され、かつ第2一次
巻線の他端が任意の一個の第1補助変流器としての特定
補助変流器における第1一次巻線の他端に第1開閉器を
介して接続されると共に特定補助変流器を除く二個の第
1補助変流器の各々における第1一次巻線の各他端に直
接接続され、かつ特定補助変流器における第1一次巻線
の他端が第2開閉器を介して前記中性点に接続されるこ
とによって、第1補助変流器の各二次巻線からこの二次
巻線に対応した第1一次巻線を流れる二次相電流に応じ
たアナログ信号としての第1一次検出信号を出力すると
共に第2補助変流器の二次巻線から第2一次巻線を流れ
る残留回路電流に応じたアナログ信号としての第2一次
検出信号を出力するリレー入力部と、都合三個の第1一
次検出信号のそれぞれと第2一次検出信号との各々につ
いて目的周波数成分抽出、AD変換、信号波形整形の各
信号処理を順次行って前記二次相電流のそれぞれに対応
した都合三個の第1二次検出信号と前記残留回路電流に
対応した第2二次検出信号とを出力する信号処理部と、
入力される第3制御信号に応じて回路開閉動作をする第
3開閉器が設けられ、かつすべての第1二次検出信号が
直接入力され、かつ第2二次検出信号が第3開閉器を介
して入力され、かつ前記両二次検出信号を用いて保護リ
レー演算を行ってこの演算結果に応じた少なくとも一個
のトリップ信号を出力するリレー演算部と、第2二次検
出信号が入力され、かつこの第2二次検出信号が入力さ
れている状態で第4制御信号が入力されると第2二次検
出信号の実効値を算出する実効値算出演算動作とこの演
算結果を所定の基準値と比較してこの比較結果に応じた
点検信号を出力する比較演算動作とからなる残留回路電
流監視動作を行う残留回路電流監視部と、点検開始信号
が入力されると第1乃至第4制御信号を所定の手順で出
力しまたは消滅させる一連の制御信号出力動作を一回行
う制御信号出力部とを備え、前記制御信号出力動作は、
第3開閉器が開いている時間帯の途中の時間帯の間第2
開閉器が閉状態になり、かつ第2開閉器が前記閉状態に
ある時間帯の途中の時間帯の間第1開閉器が開状態にな
り、かつ第1開閉器が前記開状態にある時間帯の途中の
時間帯の間に残留回路電流監視動作が始まって終了する
ように、第1乃至第3開閉器と残留回路電流監視部とが
第1乃至第4制御信号によって動作するようにする信号
出力動作であるようにディジタル保護リレー装置を構成
し、また、2)上記1)項に記載のレリー装置におい
て、点検開始信号は制御信号出力部に周期的に入力され
る信号であるようにディジタル保護リレー装置を構成
し、また、3)上記1)項または上記2)項のいずれか
に記載のリレー装置において、第1及び第2一次検出信
号はいずれも第1及び第2補助変流器のそれぞれによっ
て変流された電流を電圧に変換して得た電圧信号である
ようにディジタル保護リレー装置を構成した。As described above, according to the present invention, three main current transformers which are attached to a three-phase main circuit and which are commonly connected at one end and are connected in a star shape, and the main current transformer Three first auxiliary current transformers, each of which is provided correspondingly and has one end connected to the other end of the main current transformer, and one primary winding of the first auxiliary current transformer having one end A second auxiliary current transformer connected to the other end of the wire and the other end of which is connected to a common connection point of the main current transformer, the first auxiliary current transformer and the second auxiliary current transformer.
In a digital protection relay device that performs a protection relay operation based on an output signal of each secondary winding of the auxiliary current transformer, at the time of inspection, one of the three first auxiliary current transformers is disconnected and the second auxiliary current transformer is disconnected. The inspection operation is performed based on the output signal of the secondary winding of the auxiliary current transformer, and the protection relay operation based on the output signal of the secondary winding of the second auxiliary current transformer is stopped. Furthermore, according to an embodiment of the present invention, 1)
Three main current transformers attached to a three-phase main circuit and connected in a star shape, three first auxiliary current transformers corresponding to each of the main current transformers, and a second auxiliary current transformer A switch, a first switch for performing a circuit opening / closing operation according to an input first control signal, and a second switch for performing a circuit opening / closing operation according to an input second control signal, and For each auxiliary current transformer, one end of the first primary winding as the primary winding of the first auxiliary current transformer is connected to the main current transformer corresponding to the first auxiliary current transformer, and the second auxiliary current transformer is connected. One end of the second primary winding as the primary winding of the current transformer is connected to the neutral point of the main current transformer, and the other end of the second primary winding serves as an arbitrary first auxiliary current transformer. To the other end of the first primary winding of the specific auxiliary current transformer of the first auxiliary current transformer, and to each of the two first auxiliary current transformers excluding the specific auxiliary current transformer. By directly connecting to each other end of the first primary winding of the first auxiliary winding, and connecting the other end of the first primary winding of the specific auxiliary current transformer to the neutral point via the second switch. Outputting a first primary detection signal as an analog signal corresponding to a secondary phase current flowing through a first primary winding corresponding to the secondary winding from each secondary winding of the first auxiliary current transformer, and second auxiliary A relay input section that outputs a second primary detection signal as an analog signal according to the residual circuit current flowing from the secondary winding of the current transformer to the second primary winding, and three first primary detection signals for convenience And the second primary detection signal, target frequency component extraction, AD conversion, and signal waveform shaping are sequentially performed, and three first secondary detection signals corresponding to each of the secondary phase currents are provided. Outputting a second secondary detection signal corresponding to the residual circuit current And No. processing unit,
A third switch that opens and closes the circuit according to a third control signal that is input is provided, all the first secondary detection signals are directly input, and the second secondary detection signal is the third switch. A relay operation section that is input via the above-mentioned secondary detection signal and performs a protection relay operation using the two secondary detection signals to output at least one trip signal according to the operation result; and a second secondary detection signal, When the fourth control signal is input while the second secondary detection signal is input, the effective value calculation operation for calculating the effective value of the second secondary detection signal and the operation result are set to a predetermined reference value. And a residual circuit current monitoring unit that performs a residual circuit current monitoring operation including a comparison calculation operation that outputs an inspection signal corresponding to the comparison result, and a first to fourth control signals when the inspection start signal is input. Is output or disappears according to the specified procedure. And a series of control signal output operation is carried out once the control signal output unit that, the control signal output operation,
2nd during the time zone in the middle of the 3rd switch opening
A time period in which the first switch is in the open state and the first switch is in the open state during a time period in the middle of the time period in which the switch is in the closed state and the second switch is in the closed state. The first to third switches and the residual circuit current monitoring unit are operated by the first to fourth control signals so that the residual circuit current monitoring operation starts and ends during the time period in the middle of the band. The digital protection relay device is configured to perform a signal output operation, and 2) in the relay device according to the above item 1), the inspection start signal is a signal periodically input to the control signal output unit. A digital protection relay device, and 3) the relay device according to any one of 1) or 2) above, wherein the first and second primary detection signals are both first and second auxiliary current transformers. The current transformed by each of the And configure the digital protective relay device to be a voltage signal obtained by conversion into.
【0012】このため、上記のように構成すると、いず
れの保護リレー装置の場合にも、制御信号出力部が行う
制御信号出力動作によって、三相主回路が平衡状態にあ
る場合に三個の主変流器の残留回路を構成する第2一次
巻線に特定補助変流器における第1一次巻線を除く他の
二個の第1一次巻線のそれぞれを流れる都合二個の二次
相電流の和電流を、リレー演算部の動作に大きい影響を
及ぼすことなく、流すようにすることができ、さらにこ
の和電流にもとづく第2二次検出信号の大きさを残留回
路電流監視部が出力する点検信号によって点検すること
ができて、この場合前述した電流源8及び三次巻線7c
が不要であるから、第2補助変流器とこの変流器に連な
る上述の信号処理系統23とに対する健全性の点検を第
2一次巻線を除外することなく一括して行うことがで
き、かつこの点検を行う点検装置の構成が簡単になるデ
ィジテル保護リレー装置が得られることになり、したが
って、本発明には自己点検機能及び部品点数の面で信頼
度が従来装置よりも向上する効果がある。For this reason, with the above configuration, in any of the protection relay devices, the control signal output operation performed by the control signal output section causes the three main circuits to operate when the three-phase main circuit is in a balanced state. Two secondary phase currents that conveniently flow through each of the other two first primary windings of the auxiliary current transformer except the first primary winding in the second primary winding that constitutes the residual circuit of the current transformer Of the second secondary detection signal based on the sum current can be output from the residual circuit current monitoring unit. It can be inspected by an inspection signal, and in this case, the above-mentioned current source 8 and tertiary winding 7c
Is unnecessary, the soundness of the second auxiliary current transformer and the above-mentioned signal processing system 23 connected to the current transformer can be collectively checked without excluding the second primary winding. And, a digitel protection relay device in which the configuration of the inspection device for performing this inspection is simplified can be obtained. Therefore, the present invention has the effect of improving the reliability in terms of the self-inspection function and the number of parts as compared with the conventional device. is there.
【図1】本発明の一実施例の構成説明図FIG. 1 is an explanatory diagram of the configuration of an embodiment of the present invention.
【図2】図1に示した実施例における要部の動作態様説
明図FIG. 2 is an operation mode explanatory diagram of a main part in the embodiment shown in FIG.
【図3】従来のディジタル保護リレー装置の構成説明図FIG. 3 is an explanatory diagram of a configuration of a conventional digital protection relay device.
2r 主変流器 2s 主変流器 2t 主変流器 3 三相主回路 4 第1補助変流器 4a 第1一次巻線 4b 二次巻線 5 第1補助変流器(特定補助変流器) 5a 第1一次巻線 5b 二次巻線 6 第1補助変流器 6a 第1一次巻線 6b 二次巻線 13r 第1二次検出信号 13s 第1二次検出信号 13t 第1二次検出信号 13z 第2二次検出信号 14 信号処理部 15 リレー演算部 16 第3開閉器 17a トリップ信号 18 残留回路電流監視部 20a 点検信号 21a 第3制御信号 21b 第4制御信号 22 点検開始信号 25 第2補助変流器 25a 第2一次巻線 25b 二次巻線 26 第1開閉器 27 第2開閉器 28 リレー入力部 29 制御信号出力部 29a 第1制御信号 29b 第2制御信号 30 ディジタル保護リレー装置 B 残留回路電流監視動作 Ir 二次相電流 Is 二次相電流 It 二次相電流 Iz 残留回路電流 Vr 第1一次検出信号 Vs 第1一次検出信号 Vt 第1一次検出信号 Vz 第2一次検出信号 2r main current transformer 2s main current transformer 2t main current transformer 3 three-phase main circuit 4 first auxiliary current transformer 4a first primary winding 4b secondary winding 5 first auxiliary current transformer (specific auxiliary current transformer 5a 1st primary winding 5b secondary winding 6 1st auxiliary current transformer 6a 1st primary winding 6b secondary winding 13r 1st secondary detection signal 13s 1st secondary detection signal 13t 1st secondary Detection signal 13z Second secondary detection signal 14 Signal processor 15 Relay calculator 16 Third switch 17a Trip signal 18 Residual circuit current monitor 20a Inspection signal 21a Third control signal 21b Fourth control signal 22 Inspection start signal 25th 2 Auxiliary current transformer 25a Second primary winding 25b Secondary winding 26 First switch 27 Second switch 28 Relay input section 29 Control signal output section 29a First control signal 29b Second control signal 30 Digital protection relay device B residual Circuit current monitoring operation Ir secondary phase current Is secondary phase current It secondary phase current Iz residual circuit current Vr first primary detection signal Vs first primary detection signal Vt first primary detection signal Vz second primary detection signal
Claims (4)
共通接続されて星形に接続された三個の主変流器と、こ
の主変流器にそれぞれ対応して設けられ各一次巻線の一
端が前記主変流器の他端にそれぞれ接続された三個の第
1補助変流器と、一端が前記第1補助変流器の各一次巻
線の他端に接続され他端が前記主変流器の共通接続点に
接続された第2補助変流器とを備え、前記第1補助変流
器および第2補助変流器の各二次巻線の出力信号に基づ
いて保護リレー動作を行なうディジタル保護リレー装置
において、点検時には前記三個の第1補助変流器の内1
個を切離して、前記第2補助変流器の二次巻線の出力信
号に基づいて点検動作を行なうと共に、前記第2補助変
流器の二次巻線の出力信号に基づく保護リレー動作を停
止することを特徴とするディジタル保護リレー装置。1. Three main current transformers attached to a three-phase main circuit, one ends of which are commonly connected to each other and connected in a star shape, and primary windings respectively provided corresponding to the main current transformers. Of three first auxiliary current transformers each having one end connected to the other end of the main current transformer, and one end connected to the other end of each primary winding of the first auxiliary current transformer and the other end A second auxiliary current transformer connected to a common connection point of the main current transformer, and protection based on output signals of respective secondary windings of the first auxiliary current transformer and the second auxiliary current transformer In a digital protection relay device that performs a relay operation, one of the three first auxiliary current transformers is used for inspection.
The pieces are separated to perform an inspection operation based on the output signal of the secondary winding of the second auxiliary current transformer, and a protection relay operation based on the output signal of the secondary winding of the second auxiliary current transformer. Digital protection relay device characterized by stopping.
された三個の主変流器と、前記主変流器のそれぞれに対
応する都合三個の第1補助変流器と、第2補助変流器
と、入力される第1制御信号に応じて回路開閉動作をす
る第1開閉器と、入力される第2制御信号に応じて回路
開閉動作をする第2開閉器とが設けられ、 かつ前記第1補助変流器ごとにこの第1補助変流器に対
応する前記主変流器に該第1補助変流器の一次巻線とし
ての第1一次巻線の一端が接続され、 かつ前記第2補助変流器の一次巻線としての第2一次巻
線の一端が前記主変流器の中性点に接続され、 かつ前記第2一次巻線の他端が任意の一個の前記第1補
助変流器としての特定補助変流器における前記第1一次
巻線の他端に前記第1開閉器を介して接続されると共に
前記特定補助変流器を除く二個の前記第1補助変流器の
各々における前記第1一次巻線の各他端に直接接続さ
れ、 かつ前記特定補助変流器における前記第1一次巻線の他
端が前記第2開閉器を介して前記中性点に接続されるこ
とによって、 前記第1補助変流器の各二次巻線からこの二次巻線に対
応した前記第1一次巻線を流れる二次相電流に応じたア
ナログ信号としての第1一次検出信号を出力すると共に
前記第2補助変流器の二次巻線から前記第2一次巻線を
流れる残留回路電流に応じたアナログ信号としての第2
一次検出信号を出力するリレー入力部と、 都合三個の前記第1一次検出信号のそれぞれと前記第2
一次検出信号との各々について目的周波数成分抽出、A
D変換、信号波形整形の各信号処理を順次行って前記二
次相電流のそれぞれに対応した都合三個の第1二次検出
信号と前記残留回路電流に対応した第2二次検出信号と
を出力する信号処理部と、 入力される第3制御信号に応じて回路開閉動作をする第
3開閉器が設けられ、かつすべての前記第1二次検出信
号が直接入力され、かつ前記第2二次検出信号が前記第
3開閉器を介して入力され、かつ前記両二次検出信号を
用いて保護リレー演算を行ってこの演算結果に応じた少
なくとも一個のトリップ信号を出力するリレー演算部
と、 前記第2二次検出信号が入力され、かつこの第2二次検
出信号が入力されている状態で第4制御信号が入力され
ると前記第2二次検出信号の実効値を算出する実効値算
出演算動作とこの演算結果を所定の基準値と比較してこ
の比較結果に応じた点検信号を出力する比較演算動作と
からなる残留回路電流監視動作を行う残留回路電流監視
部と、 点検開始信号が入力されると前記第1乃至第4制御信号
を所定の手順で出力しまたは消滅させる一連の制御信号
出力動作を一回行う制御信号出力部とを備え、前記制御
信号出力動作は、前記第3開閉器が開いている時間帯の
途中の時間帯の間前記第2開閉器が閉状態になり、かつ
前記第2開閉器が前記閉状態にある時間帯の途中の時間
帯の間前記第1開閉器が開状態になり、かつ前記第1開
閉器が前記開状態にある時間帯の途中の時間帯の間に前
記残留回路電流監視動作が始まって終了するように、前
記第1乃至第3開閉器と前記残留回路電流監視部とが前
記第1乃至第4制御信号によって動作するようにする信
号出力動作であることを特徴とするディジタル保護リレ
ー装置。2. Three main current transformers mounted in a three-phase main circuit and connected in a star shape, and three first auxiliary current transformers corresponding to each of the main current transformers. A second auxiliary current transformer, a first switch that performs a circuit opening / closing operation according to an input first control signal, and a second switch that performs a circuit opening / closing operation according to an input second control signal. One end of a first primary winding as a primary winding of the first auxiliary current transformer is provided for each of the first auxiliary current transformers, and the main current transformer corresponding to the first auxiliary current transformer has one end thereof. One end of a second primary winding as a primary winding of the second auxiliary current transformer is connected to a neutral point of the main current transformer, and the other end of the second primary winding is arbitrary And a second auxiliary current transformer as one of the first auxiliary current transformers connected to the other end of the first primary winding via the first switch and Directly connected to each of the other ends of the first primary windings of each of the two first auxiliary current transformers excluding the specific auxiliary current transformer, and of the first primary winding of the specific auxiliary current transformer. The other end of each of the secondary windings of the first auxiliary current transformer is connected to the neutral point via the second switch, so that the first primary winding corresponding to the secondary winding. An analog signal corresponding to a residual circuit current flowing from the secondary winding of the second auxiliary current transformer through the second primary winding while outputting a first primary detection signal as an analog signal corresponding to a secondary phase current flowing through Second as a signal
A relay input section for outputting a primary detection signal; and each of the three first primary detection signals and the second
Target frequency component extraction for each primary detection signal, A
Each signal processing such as D conversion and signal waveform shaping is sequentially performed, and three convenient first secondary detection signals corresponding to each of the secondary phase currents and second secondary detection signals corresponding to the residual circuit currents are generated. A signal processing unit for outputting and a third switch for performing a circuit opening / closing operation according to a third control signal that is input are provided, all the first secondary detection signals are directly input, and the second secondary detection signal is input. A next detection signal is input through the third switch, and a relay operation unit that performs a protection relay operation using both the secondary detection signals and outputs at least one trip signal according to the operation result; An effective value for calculating the effective value of the second secondary detection signal when the second control signal is input while the second secondary detection signal is being input and the second secondary detection signal is being input. Calculate calculation operation and the result of this calculation to a predetermined reference value A residual circuit current monitoring unit that performs a residual circuit current monitoring operation including a comparison calculation operation that outputs a check signal corresponding to the comparison result, and the first to fourth control signals when an inspection start signal is input. And a control signal output section that performs a series of control signal output operations for outputting or disappearing in a predetermined procedure once, wherein the control signal output operation is a time in the middle of the time period in which the third switch is open. The second switch is in the closed state during the band, and the first switch is in the open state during a time period in the middle of the time period in which the second switch is in the closed state, and the first switch The first to third switches and the residual circuit current monitoring unit are configured so that the residual circuit current monitoring operation starts and ends during a time period in the middle of the time period in which the switch is in the open state. Operate by the first to fourth control signals Digital protection relay device which is a signal output operation.
検開始信号は制御信号出力部に周期的に入力される信号
であることを特徴とするディジタル保護リレー装置。3. The digital protective relay device according to claim 2, wherein the inspection start signal is a signal periodically input to the control signal output section.
置において、第1及び第2一次検出信号はいずれも第1
及び第2補助変流器のそれぞれによって変流された電流
を電圧に変換して得た電圧信号であることを特徴とする
ディジタル保護リレー装置。4. The relay device according to claim 2 or 3, wherein both the first and second primary detection signals are first.
And a digital protection relay device, which is a voltage signal obtained by converting a current transformed by each of the second auxiliary current transformer into a voltage.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3236670A JPH0583841A (en) | 1991-09-18 | 1991-09-18 | Digital protective relay unit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3236670A JPH0583841A (en) | 1991-09-18 | 1991-09-18 | Digital protective relay unit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0583841A true JPH0583841A (en) | 1993-04-02 |
Family
ID=17004046
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3236670A Pending JPH0583841A (en) | 1991-09-18 | 1991-09-18 | Digital protective relay unit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0583841A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002044856A (en) * | 2000-07-25 | 2002-02-08 | Mitsubishi Electric Corp | Leakage current relay |
US8923361B2 (en) | 2011-10-13 | 2014-12-30 | Mitsubishi Electric Corporation | Protection control apparatus |
-
1991
- 1991-09-18 JP JP3236670A patent/JPH0583841A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002044856A (en) * | 2000-07-25 | 2002-02-08 | Mitsubishi Electric Corp | Leakage current relay |
US8923361B2 (en) | 2011-10-13 | 2014-12-30 | Mitsubishi Electric Corporation | Protection control apparatus |
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