JPH0620145Y2 - Test and measurement equipment for instrument transformers - Google Patents

Test and measurement equipment for instrument transformers

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Publication number
JPH0620145Y2
JPH0620145Y2 JP1989139740U JP13974089U JPH0620145Y2 JP H0620145 Y2 JPH0620145 Y2 JP H0620145Y2 JP 1989139740 U JP1989139740 U JP 1989139740U JP 13974089 U JP13974089 U JP 13974089U JP H0620145 Y2 JPH0620145 Y2 JP H0620145Y2
Authority
JP
Japan
Prior art keywords
circuit
current
voltage
measurement
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.)
Expired - Lifetime
Application number
JP1989139740U
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Japanese (ja)
Other versions
JPH0378280U (en
Inventor
英男 田中
光朗 相田
利幸 足立
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Energy Support Corp
Original Assignee
Energy Support Corp
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Priority to JP1989139740U priority Critical patent/JPH0620145Y2/en
Publication of JPH0378280U publication Critical patent/JPH0378280U/ja
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Publication of JPH0620145Y2 publication Critical patent/JPH0620145Y2/en
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Description

【考案の詳細な説明】 （産業上の利用分野） この考案は発変電所における計器用変成器の試験計測装
置に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a test and measurement device for an instrument transformer in a power substation.

（従来の技術） 発変電所においては、計器用変成器（以下ＣＴという）
が多く使用されており、このＣＴは一次設備に流れる電
流をＣＴ二次電流として取り出し、発変電設備の保護及
び計測要素として保護継電器・メータ類の入力として使
用している。そして、このＣＴ回路に係わる工事等を実
施した場合には試験としてＣＴ一次試験を行うことが義
務付けられている。従来から、行なわれている一次試験
方法は、発変電設備の一次側導体より電流発生器によ
り、数百アンペアの電流を流し込みＣＴの二次側に発生
する電流をその必要箇所毎に電流値、基準電圧（計器用
変圧器二次出力）との位相差を測定する。そして、この
値がＣＴの変成比どうりのものであるか、又、位相ある
いはＣＴの極性が適切か否かを判断するものである。(Prior Art) In a power substation, a transformer for an instrument (hereinafter referred to as CT)
This CT takes out the current flowing in the primary equipment as the CT secondary current and uses it as the protection relay of the power generation and transformation equipment and the input of protective relays and meters. When the construction related to this CT circuit is carried out, it is obligatory to perform a CT primary test as a test. Conventionally, the primary test method that has been performed is that a current generator from the primary side conductor of the power generation and transformation equipment injects a current of several hundred amperes to generate a current on the secondary side of the CT for each required location, Measure the phase difference from the reference voltage (secondary output of transformer for instrument). Then, it is determined whether or not this value is based on the CT transformation ratio, and whether or not the phase or the polarity of CT is appropriate.

この場合、ＣＴ要素を使用する箇所は多く、数箇所から
十箇所以上に及ぶときもあり、測定箇所毎に４個の電流
計（または相切替器と１個の電流計）と位相計が必要と
なる。また、電流発生器の定格上、長時間にわたって電
流を流し続けることができないため、測定箇所２〜３箇
所につき一名の人員を配置し、電流値、位相差を読み取
り記録していくという方法をとっている。In this case, there are many places where CT elements are used, sometimes from several places to more than ten places, and four ammeters (or phase changer and one ammeter) and phase meters are required for each measuring place. Becomes In addition, due to the current generator rating, it is impossible to keep the current flowing for a long time. Therefore, one person is assigned to each of the measurement points 2-3, and the current value and phase difference are read and recorded. I am taking it.

（考案が解決しようとする問題点） ところがこの方法は測定のための人員が多数必要であ
り、計器（アナログメータ）もおよそ、測定箇所数×４
個の個数が必要となり、精密機器をこれだけ多数揃え、
かつ取扱わなければならないことになる。(Problems to be solved by the invention) However, this method requires a large number of personnel for measurement, and an instrument (analog meter) also has approximately 4 measurement points.
The number of pieces is required, so we have a large number of precision equipment,
And it will have to be handled.

そこで、近時においては、測定箇所毎に設けられた各Ｃ
Ｔの二次側からそれぞれケーブル等を配電盤室内に引回
して一箇所に集め、これら各ケーブル等からなる複数
（４回線）の電流回路を一つのラップ接点付切替器に接
続し、同切替器にて切替え選択した電流回路の電流値に
基づき電気的測定を行なうという方法も提案されてい
る。Therefore, recently, each C provided at each measurement point
From the secondary side of T, cables etc. are routed into the switchboard room and collected at one place, and a plurality of (4 lines) current circuits consisting of these cables etc. are connected to one switch with wrap contact, and the same switch A method has also been proposed in which electrical measurement is performed based on the current value of the current circuit switched and selected in.

しかし、この方法によった場合には、測定箇所毎に必要
な計器の個数こそ少なくできるものの、前記切替器から
離れた地点にある各別測定箇所では、その測定箇所の各
ＣＴから引回された前記ケーブル等が課電状態にあるの
か否かを外見上判断できないため、誤って課電状態にあ
るケーブル等を外してＣＴ回路をオープンすると、過大
電圧の発生を招いて危険であるという問題があった。
又、電流回路を構成するケーブル等の引回しはＣＴの負
担を増大させるばかりか、電流容量の大きな電流回路そ
のものを切替える構成であるため、安全上の見地から切
替器が大型化するという問題もあった。さらに、発変電
所等のように測定箇所が複数箇所に及び場合には、各測
定箇所毎に測定の開始前後において前記電流回路の設置
作業と取外作業を繰り返さなければならず、迅速に測定
作業を行なえないという問題もあった。However, according to this method, although the number of instruments required for each measurement point can be reduced, at each separate measurement point at a point distant from the switching device, each CT at the measurement point is routed. Since it is not possible to externally judge whether or not the cable or the like is in a voltage-applied state, if a cable or the like that is in a voltage-applied state is mistakenly opened and the CT circuit is opened, an excessive voltage is generated, which is dangerous. was there.
In addition, routing a cable or the like that constitutes the current circuit not only increases the burden on the CT, but also involves switching the current circuit itself having a large current capacity, which causes a problem that the switching device becomes large from the viewpoint of safety. there were. Furthermore, when there are multiple measurement points, such as a substation, it is necessary to repeat the installation work and removal work of the current circuit before and after the start of measurement at each measurement point, so that the measurement can be performed quickly. There was also a problem that I could not work.

この考案は前記従来の問題点を解消するためになされた
ものであって、その目的は測定に必要な計器数及び人員
を少なくできるばかりでなく、課電状態時に誤ってＣＴ
回路をオープンする危険を未然防止するとともに、測定
時におけるＣＴ負担を軽減しつつ装置の小形化を図るこ
とにある。The present invention has been made to solve the above-mentioned conventional problems, and its purpose is not only to reduce the number of measuring instruments and personnel required for measurement, but also to erroneously perform CT during power application.
The purpose is to prevent the risk of opening the circuit and to reduce the CT load during measurement while reducing the size of the device.

（問題点を解決するための手段） 前記目的を達成するために、この考案は複数の測定箇所
毎に配置され、当該測定箇所において接続された各相変
成器の二次側出力を電圧変換する電圧変換回路と、前記
各相変成器の二次側が出力状態にあるか否かを表示する
電流表示回路とを備えた複数個の電圧変換器と、 前記各電圧変換器と個々に接続される複数個の入力部、
それら各入力部のうち任意の一つの入力部を切換え選択
する切換回路、その切換え選択された入力部からの入力
信号に基づいて所定の電気的計測を行なう計測回路及び
その計測された結果を表示する表示部とを備えた１個の
計測器とから構成したことを要旨とするものである。(Means for Solving Problems) In order to achieve the above-mentioned object, the present invention is arranged at a plurality of measurement points, and converts the secondary side output of each phase transformer connected at the measurement points into a voltage. A plurality of voltage converters each including a voltage conversion circuit and a current display circuit that indicates whether or not the secondary side of each phase transformer is in an output state, and are individually connected to each voltage converter. Multiple input parts,
A switching circuit for switching and selecting any one of the input units, a measuring circuit for performing a predetermined electrical measurement based on an input signal from the selected input unit, and a display of the measured result The gist of the present invention is that it is composed of one measuring instrument provided with a display section that operates.

（作用） この計測装置を使用するには、まず、発変電所の各測定
箇所、即ち計器用盤、線路保護用盤等の各盤のＣＴの一
次側に流れる電流を遮断した状態で、発変電所の計器用
盤、線路保護用盤等の各盤におけるＣＴの二次側にそれ
ぞれ電圧変換器を接続し、それらの各電圧変換器を計測
器の入力部に接続する。そして、切換回路を測定したい
盤に対応して切換える。この状態で測定する盤における
ＣＴの一次側に電流発生器にて測定電流を注入する。す
ると、前記切換回路により切換え選択された盤における
ＣＴ回路は課電状態にあることが電圧変換器の電流表示
回路により表示される。そして、変換器の二次側から出
力される信号に基づいて必要な電気的測定対象を測定
し、表示部にて測定した結果を表示する。一つの盤が終
了すると切換回路を次の盤に対応させるべく切換え、以
後同様に測定を行なえばよい。(Operation) In order to use this measuring device, first, in a state where the current flowing to the primary side of CT of each measurement point of the power substation, that is, each panel such as instrument panel and line protection panel is cut off, Voltage converters are connected to the secondary side of CT in each panel such as instrument panel and line protection panel at the substation, and these voltage converters are connected to the input part of the measuring instrument. Then, the switching circuit is switched according to the board to be measured. In this state, a measurement current is injected by the current generator to the primary side of CT in the board to be measured. Then, the current display circuit of the voltage converter indicates that the CT circuit in the panel switched and selected by the switching circuit is in the power-on state. Then, the necessary electrical measurement target is measured based on the signal output from the secondary side of the converter, and the measurement result is displayed on the display unit. When one board is completed, the switching circuit is switched to correspond to the next board, and the same measurement may be performed thereafter.

（実施例） 以下、この考案を具体化した実施例を第１図〜第６図に
従って説明する。(Embodiment) An embodiment embodying the present invention will be described below with reference to FIGS.

本装置は発変電所の各測定箇所、即ち、計器用盤、線路
保護用盤等の盤における各計器用変成器の二次側に接続
され、その二次側出力を電圧変換する電圧変換器Ａ１〜
Ａ８と、その電圧変換された信号を測定する計測器Ｂと
から構成されている。This device is a voltage converter that is connected to the secondary side of each measuring transformer in each measuring point of the power substation, that is, in the panel such as the instrument panel and the line protection panel, and the secondary side output voltage is converted. A1-
A8 and a measuring instrument B for measuring the voltage-converted signal.

まず、電圧変換器Ａ１〜Ａ８について説明する。なお、
電圧変換器Ａ１〜Ａ８は同一構成のため、説明の便宜上
Ａ１についてのみ説明する。First, the voltage converters A1 to A8 will be described. In addition,
Since the voltage converters A1 to A8 have the same configuration, only A1 will be described for convenience of description.

第３図に示すように電圧変換器Ａ１はＣＴ二次出力であ
るＲ相の電流ＩＲ、Ｓ相の電流ＩＳ、Ｔ相の電流ＩＴ及
び各相の合成出力である零相電流ＩＯをそれぞれ電圧変
換するための電圧変換部１ａ〜１ｄを備えている。電圧
変換部１ａ〜１ｄは互いに同一構成のため、Ｒ相用の電
圧変換部１ａについて説明する。入力端子Ｐ１，Ｐ２間
には電圧変換回路２が接続され、ＣＴの二次側出力を所
定の電圧に変換する。又、入力端子Ｐ１，Ｐ２間にはＬ
ＥＤ等の発光素子７ａ等から構成される電流表示回路３
が接続され、ＣＴの二次側出力があるときに点灯するよ
うになっている。さらに、前記電流表示回路３よりも入
力側において入力端子Ｐ１，Ｐ２間には常開のリレー接
点Ｘ／ａ１が接続され、入力端子間Ｐ１，Ｐ２が短絡可
能になっている。As shown in FIG. 3, the voltage converter A1 has an R-phase current I R that is a CT secondary output, an S-phase current I S , a T-phase current I T, and a zero-phase current I that is a combined output of each phase. It is provided with voltage converters 1a to 1d for respectively converting the voltage of O. Since the voltage conversion units 1a to 1d have the same configuration, the voltage conversion unit 1a for the R phase will be described. The voltage conversion circuit 2 is connected between the input terminals P1 and P2, and converts the secondary side output of CT into a predetermined voltage. Also, L is placed between the input terminals P1 and P2.
A current display circuit 3 including a light emitting element 7a such as an ED
Is connected and is turned on when there is a secondary side output of CT. Further, a normally open relay contact X / a1 is connected between the input terminals P1 and P2 on the input side of the current display circuit 3 so that the input terminals P1 and P2 can be short-circuited.

電圧変換回路２の出力側にはフォトカプラ４が接続さ
れ、電圧変換回路２から電気的に絶縁するようになって
いる。フォトカプラ４の一方の出力端子は変換器Ａ１の
出力端子Ｐ３に接続されるとともに、他方の出力端子は
アース接地された変換器Ａ１の出力端子Ｐ４に接続され
ている。又、前記フォトカプラ４の一方の出力端子は抵
抗Ｒ、リレー接点Ｘ／ａ２を介して短絡表示回路５に接
続されている。同短絡表示回路５はＬＥＤ等の発光素子
８等から構成されており、変換器Ａ１に設けたリレーＸ
の動作により前記リレー接点Ｘ／ａ２が閉成されると、
発光素子８が短絡表示を行なうようになっている。な
お、前記リレーＸは後記計測器Ｂの短絡スイッチ１４の
操作に基づいて動作され、このリレーＸの動作により電
圧変換器Ａ１内全ての二次側出力は短絡状態に保持され
る。A photo coupler 4 is connected to the output side of the voltage conversion circuit 2 so as to be electrically insulated from the voltage conversion circuit 2. One output terminal of the photocoupler 4 is connected to the output terminal P3 of the converter A1, and the other output terminal is connected to the output terminal P4 of the converter A1 which is grounded. Further, one output terminal of the photocoupler 4 is connected to the short circuit display circuit 5 via a resistor R and a relay contact X / a2. The short circuit display circuit 5 is composed of a light emitting element 8 such as an LED, and the relay X provided in the converter A1.
When the relay contact X / a2 is closed by the operation of
The light emitting element 8 is adapted to display a short circuit. The relay X is operated based on the operation of the short-circuit switch 14 of the measuring instrument B described later, and the operation of the relay X keeps all the secondary-side outputs in the voltage converter A1 in a short-circuited state.

第６図は電圧変換器Ａ１の外観を示し、ケースの一端に
は入力端子を含むコネクタ６が設けられ、他端には出力
端子を含むコネクタ（図示しない）が設けられている。
又、電圧変換器Ａ１の上面には測定対象となる各電流が
通電されているか否かを示すための前記電流表示回路３
の一部を構成する発光素子７ａ〜７ｄ（なお、７ｂはＩ
Ｓ用の発光素子、７ｃはＩＴ用の発光素子、７ｄはＩＯ
用の発光素子である）及び短絡表示回路５の発光素子８
が配設されている。FIG. 6 shows the appearance of the voltage converter A1, in which a connector 6 including an input terminal is provided at one end of the case, and a connector (not shown) including an output terminal is provided at the other end.
Further, the current display circuit 3 for indicating whether or not each current to be measured is supplied to the upper surface of the voltage converter A1.
Of the light-emitting elements 7a to 7d (7b is I
Emitting element for S, 7c light emitting element for I T, 7d is I O
Light emitting element) and the light emitting element 8 of the short-circuit display circuit 5.
Is provided.

次に計測器Ｂについて説明する。Next, the measuring instrument B will be described.

計測器Ｂは大きく分けて、計測回路としての電流計測部
及び位相計測部、表示部、及び電源部とにより構成され
ている。The measuring device B is roughly divided into a current measuring unit and a phase measuring unit as a measuring circuit, a display unit, and a power supply unit.

第２図に示すように電流計測部について説明すると、計
測器Ｂには前記電圧変換器Ａ１〜Ａ８の出力側端子に対
し制御ケーブル（図示しない）を介して個々に接続され
る入力部としての入力端子Ｐ１１〜Ｐ１８が設けられて
いる。各入力端子Ｐ１１〜Ｐ１８は切換回路としての変
換器切換回路１１に接続され、計測器Ｂの正面の操作パ
ネル３６に設けた変換器切換スイッチ１２ａ〜１２ｈに
より各変換器Ａ１〜Ａ８に対応して選択的に切換可能に
なっている。Explaining the current measuring unit as shown in FIG. 2, the measuring unit B serves as an input unit individually connected to the output side terminals of the voltage converters A1 to A8 via control cables (not shown). Input terminals P11 to P18 are provided. Each of the input terminals P11 to P18 is connected to the converter switching circuit 11 as a switching circuit, and the converter switching switches 12a to 12h provided on the operation panel 36 on the front surface of the measuring instrument B correspond to the converters A1 to A8. It can be selectively switched.

なお、前記変換器切換回路１１には短絡回路１３が接続
され、計測器Ｂの操作パネル３６に設けた短絡スイッチ
１４をオン操作することにより、変換器切換回路１１に
て選択された変換器のリレーＸを動作させる。A short circuit 13 is connected to the converter switching circuit 11, and the short circuit switch 14 provided on the operation panel 36 of the measuring instrument B is turned on to switch the converter selected by the converter switching circuit 11. Operate relay X.

前記変換器切換回路１１には電流切換回路１５が接続さ
れ、計測器Ｂの操作パネル３６に設けた電流切換スイッ
チ１６ａ〜１６ｄを操作することにより、前記各種の電
流ＩＲ、ＩＳ、ＩＴ、ＩＯのうち測定する電流が選択可
能である。前記電流切換回路１５には増幅・アッテネー
タ回路１７が接続され、電流切換回路１５からの信号を
所定の倍率に増幅する。前記増幅・アッテネータ回路１
７には前記信号を整流する整流回路１８が接続され、整
流回路１８にはＶ−Ｆコンバータ１９が接続され、整流
回路１８から出力された信号を電圧から周波数に変換す
る。Wherein the current switching circuit 15 is connected to the converter switching circuit 11, by operating the current change-over switch 16a~16d provided on the operation panel 36 of the instrument B, the various current I R, I S, I T , I O , the current to be measured can be selected. An amplification / attenuator circuit 17 is connected to the current switching circuit 15 and amplifies the signal from the current switching circuit 15 to a predetermined magnification. The amplification / attenuator circuit 1
A rectifier circuit 18 for rectifying the signal is connected to 7, and a VF converter 19 is connected to the rectifier circuit 18 to convert the signal output from the rectifier circuit 18 from voltage to frequency.

ゲート回路２０は前記Ｖ−Ｆコンバータ１９にて周波数
変換された信号のうち所定の信号を演算回路２１に出力
し、演算回路はその信号に基づいて電流を演算し、その
演算結果をラッチ回路２２に出力する。ラッチ回路２２
はその演算結果を所定時間保持し、電流表示回路２３は
その演算結果を第５図に示す計測器Ｂの操作パネル３６
に設けた表示部を構成するデジタル表示部２３ａにて表
示させる。The gate circuit 20 outputs a predetermined signal of the signals frequency-converted by the VF converter 19 to the arithmetic circuit 21, the arithmetic circuit calculates a current based on the signal, and the calculation result is latched by the latch circuit 22. Output to. Latch circuit 22
Holds the calculation result for a predetermined time, and the current display circuit 23 displays the calculation result on the operation panel 36 of the measuring instrument B shown in FIG.
It is displayed on the digital display section 23a which constitutes the display section provided in.

前記整流回路１８、Ｖ−Ｆコンバータ１９、ゲート回路
２０、演算回路２１、及びラッチ回路２２により電流計
測回路５０が構成されている。The rectifier circuit 18, the VF converter 19, the gate circuit 20, the arithmetic circuit 21, and the latch circuit 22 constitute a current measuring circuit 50.

次に、位相計測部について説明する。Next, the phase measuring unit will be described.

位相計測部の入力端子Ｐｖ、Ｐａ、Ｐｇはそれぞれ基準
電圧入力端子、基準電流入力端子、接地端子である。基
準電圧入力端子Ｐｖ、基準電流入力端子Ｐａはフューズ
Ｆを介して、基準入力切換回路２４に接続され、計測器
Ｂの操作パネル３６に設けた基準入力切換スイッチ２５
ａ，２５ｂの操作により、基準電圧、基準電流のうちい
ずれかを選択可能になっている。なお、基準入力切換回
路２４は基準測定切換回路２６を介して前記電流計測回
路５０の整流回路１８に接続され、計測器Ｂの操作パネ
ル３６に設けた基準測定切換スイッチ２７の切換操作に
より、基準入力の電流値、電圧値の測定が可能である。The input terminals Pv, Pa, Pg of the phase measuring unit are a reference voltage input terminal, a reference current input terminal, and a ground terminal, respectively. The reference voltage input terminal Pv and the reference current input terminal Pa are connected to the reference input changeover circuit 24 via the fuse F, and the reference input changeover switch 25 provided on the operation panel 36 of the measuring instrument B.
By operating a and 25b, either the reference voltage or the reference current can be selected. The reference input switching circuit 24 is connected to the rectifier circuit 18 of the current measuring circuit 50 through the reference measurement switching circuit 26, and the reference measurement switching switch 27 provided on the operation panel 36 of the measuring instrument B switches the reference input. Input current and voltage can be measured.

波形整形回路２８は前記基準入力切換回路２４に接続さ
れ、基準入力切換回路２４にて選択された信号（基準電
圧、又は基準電流）の基準信号を所定の波形に整形す
る。The waveform shaping circuit 28 is connected to the reference input switching circuit 24 and shapes the reference signal of the signal (reference voltage or reference current) selected by the reference input switching circuit 24 into a predetermined waveform.

次に位相計測回路５１について説明する。Next, the phase measuring circuit 51 will be described.

位相計測回路５１は位相検知回路２９、位相分検出回路
３０、パルス変換回路３１、演算回路３２、ラッチ回路
３３とから構成されている。The phase measuring circuit 51 includes a phase detecting circuit 29, a phase component detecting circuit 30, a pulse converting circuit 31, an arithmetic circuit 32, and a latch circuit 33.

位相検知回路２９は波形整形回路２８から出力された基
準信号と、増幅・アッテネータ回路１７から出力された
測定対象信号とを入力し、測定対象信号が基準信号に対
して位相が進んでいるか、あるいは遅れているかを検出
する。位相分検出回路３０は前記測定対象信号が基準信
号に対してどれだけ位相がずれているかの位相差分を検
出するパルス変換回路３１は位相分検出回路３０にて検
出した位相差分をパルス変換する。演算回路３２は前記
パルス変換された信号に基づいて位相差を演算し、その
演算結果をラッチ回路３３に出力する。ラッチ回路３３
はその演算結果を所定時間保持し、位相表示回路３４は
その演算結果を第５図に示す計測器Ｂの操作パネル３６
に設けた前記デジタル表示部２３ａとともに表示部を構
成するデジタル表示部３４ａにて表示させる。The phase detection circuit 29 inputs the reference signal output from the waveform shaping circuit 28 and the measurement target signal output from the amplification / attenuator circuit 17, and determines whether the measurement target signal is in phase with the reference signal, or Detect if you are late. The phase difference detection circuit 30 detects the phase difference of how much the measurement target signal is out of phase with respect to the reference signal. The pulse conversion circuit 31 performs pulse conversion of the phase difference detected by the phase difference detection circuit 30. The arithmetic circuit 32 calculates the phase difference based on the pulse-converted signal and outputs the arithmetic result to the latch circuit 33. Latch circuit 33
Holds the calculation result for a predetermined time, and the phase display circuit 34 displays the calculation result on the operation panel 36 of the measuring instrument B shown in FIG.
It is displayed on the digital display section 34a which constitutes a display section together with the digital display section 23a provided on the display.

なお、３５は計測器Ｂの電源部としての電源回路であっ
て操作パネル３６の電源スイッチ３７を操作することに
より、前記各回路に電源を供給する。Reference numeral 35 denotes a power supply circuit as a power supply unit of the measuring instrument B, which operates the power supply switch 37 of the operation panel 36 to supply power to the respective circuits.

以上のように構成された試験計測装置の作用について説
明する。The operation of the test measuring device configured as described above will be described.

まず、変電所の計器用盤４１、線路保護用盤４２、テレ
メータ用盤４３、母線保護用盤４４等の各盤のＣＴの一
次側に流れる電流を遮断した状態で、変電所の計器用盤
等の各盤４１〜４８におけるＣＴの二次側にそれぞれ電
圧変換器Ａ１〜Ａ８を接続する。そして、それらの各電
圧変換器Ａ１〜Ａ８を制御ケーブルを介して計測器Ｂの
対応する入力端子Ｐ１１〜Ｐ１８に接続する。一方、基
準電圧入力端子Ｐｖ、基準電流入力端子Ｐａ、接地端子
Ｐｇに対して基準入力を付与すべく制御ケーブルを接続
する。First, in the substation instrument panel 41, the line protection panel 42, the telemeter panel 43, the busbar protection panel 44, etc., the currents flowing to the primary side of the CT are cut off. The voltage converters A1 to A8 are connected to the secondary sides of the CTs of the respective boards 41 to 48. Then, the respective voltage converters A1 to A8 are connected to the corresponding input terminals P11 to P18 of the measuring instrument B via the control cable. On the other hand, a control cable is connected to the reference voltage input terminal Pv, the reference current input terminal Pa, and the ground terminal Pg so as to give a reference input.

そして、電源回路３５をオンの状態で、変換器切換回路
１１を測定したい盤に対応して切換える。さらに、Ｒ相
の電流ＩＲ、Ｓ相の電流ＩＳ、Ｔ相の電流ＩＴ及び零相
電流ＩＯのうち測定する電流を電流切換回路１５にて選
択する。この状態で測定する盤（例えば計測器用盤４
１）におけるＣＴの一次側導体に測定電流を電流発生器
にて注入する。この測定電流を注入することにより、電
圧変換器Ａ１の二次側から出力される信号に基づいて計
器用盤４１における選択された電流の電流値及び位相が
測定され、その結果がデジタル表示部２３ａ及びデジタ
ル表示部３４ａにて表示される。Then, with the power supply circuit 35 turned on, the converter switching circuit 11 is switched according to the board to be measured. Further, the current switching circuit 15 selects the current to be measured among the R-phase current I R , the S-phase current I S , the T-phase current I T, and the zero-phase current I O. A board to be measured in this state (for example, a board for measuring instrument 4
A measurement current is injected into the primary conductor of CT in 1) with a current generator. By injecting this measured current, the current value and phase of the selected current in the instrument panel 41 are measured based on the signal output from the secondary side of the voltage converter A1, and the result is digital display 23a. And is displayed on the digital display unit 34a.

この後、同じ盤の他の電流を測定する場合には電流切換
回路１５にて次の測定対象電流を選択する。このように
して、一つの盤の測定すべき電流の測定が終了すると、
変換器切換回路１１の切換スイッチ１２ａ〜１２ｈを操
作して次の盤に対応させるべく切換え、以後同様に測定
を行なえばよい。After that, when measuring another current on the same board, the current switching circuit 15 selects the next current to be measured. In this way, when the measurement of the current to be measured on one board is completed,
The changeover switches 12a to 12h of the converter changeover circuit 11 are operated to change to correspond to the next board, and thereafter, the same measurement may be performed.

なお、基準入力の基準電流、及び基準電圧の値を知りた
い場合には計測器Ｂの操作パネル３６の基準測定切換ス
イッチ２７をオン操作し、その後、基準入力切換スイッ
チ２５ａ，２５ｂを選択操作することにより、基準電流
値及び基準電圧値をデジタル表示部２３ａにて測定する
ことができる。When it is desired to know the values of the reference current and the reference voltage of the reference input, the reference measurement changeover switch 27 of the operation panel 36 of the measuring instrument B is turned on, and then the reference input changeover switches 25a and 25b are selected. Thus, the reference current value and the reference voltage value can be measured on the digital display unit 23a.

又、計測器Ｂの操作パネル３６の短絡スイッチ１４をオ
ン操作すると、電圧変換器における電圧変換部１ａ〜１
ｄのリレーＸの接点が動作し、その電圧変換器に接続さ
れたＣＴ二次側を短絡する。従って、ＣＴの末端を不使
用時に短絡させることができるため、他の機器への悪影
響を防止することができる。Further, when the short-circuit switch 14 of the operation panel 36 of the measuring instrument B is turned on, the voltage converters 1a to 1 in the voltage converter are turned on.
The contact of the relay X of d operates and short-circuits the CT secondary side connected to the voltage converter. Therefore, the end of CT can be short-circuited when not in use, so that adverse effects on other devices can be prevented.

また、この短絡された状態では各電圧変換部１ａ〜１ｄ
の電流表示回路３は点灯しなくなるが、リレーＸの動作
でリレー接点Ｘ／ａ２が閉成されることにより、短絡表
示回路５の発光素子８が点灯するため、現在の状態が電
流遮断状態ではなく、短絡状態であると明確に区別する
ことができ、計測器Ｂと電圧変換回路Ａ１〜Ａ８との接
続、電圧変換回路Ａ１〜Ａ８と各盤とを接続する制御ケ
ーブルを誤って外すことが防止できる。Further, in this short-circuited state, each voltage conversion unit 1a to 1d
The current display circuit 3 of No. 1 does not light up, but the relay contact X / a2 is closed by the operation of the relay X, so that the light-emitting element 8 of the short-circuit display circuit 5 lights up. However, it is possible to clearly distinguish that it is in a short-circuit state, and it is possible to accidentally disconnect the connection between the measuring instrument B and the voltage conversion circuits A1 to A8 and the control cable connecting the voltage conversion circuits A1 to A8 and each panel. It can be prevented.

又、電圧変換器Ａ１〜Ａ８は各電流の測定時において、
リレー接点Ｘ／ａ１が閉成されていない場合には測定対
象となる電流の計測に係わる電圧変換部１ａ〜１ｄの電
流表示回路３により計測対象の電流に対応した発光素子
７ａ〜７ｄが点灯するため、通電されていることを確認
することができる。In addition, the voltage converters A1 to A8 are
If the relay contact X / a1 is not closed, the light emitting elements 7a to 7d corresponding to the current to be measured are turned on by the current display circuit 3 of the voltage conversion units 1a to 1d related to the measurement of the current to be measured. Therefore, it can be confirmed that the power is supplied.

なお、この考案は前記実施例に限定されるものではな
く、発電所における盤のＣＴの二次出力を測定すること
も可能であり、又、この考案の趣旨から逸脱しない範囲
で任意に変更することも可能である。The present invention is not limited to the above-mentioned embodiment, but it is also possible to measure the secondary output of CT of the panel at the power plant, and it is arbitrarily changed without departing from the spirit of the present invention. It is also possible.

（考案の効果） 以上詳述したように、この考案によれば従来よりも測定
に必要な計器数及び人員を少なくできるばかりでなく、
各測定箇所毎において電圧変換器に設けられた電流表示
回路の表示状態を視認することにより、課電状態にある
ＣＴ回路を誤ってオープンする危険を未然に防止できる
とともに、ＣＴの二次側から出力された電流は電圧変換
器により電圧変換されて測定者が操作する計測器には直
接流れ込まないので、測定作業の安全性を向上すること
ができる。又、ＣＴの二次側に電流回路を引回す必要も
ないことから、測定時におけるＣＴ負担を軽減し得る一
方、計測器では電流回路の切換えでなく前記電圧変換器
に接続された入力部を切換え操作する構成としたので、
計測器を大形にする必要がなく、装置全体の小形化を図
ることができ、さらには計測器側での切換え選択により
複数の測定箇所について連続的に測定を進めることがで
きるので、測定箇所が多数に及び場合にも迅速に測定作
業を行なうことができるという効果がある。(Effect of the Invention) As described in detail above, according to the present invention, not only can the number of measuring instruments and the number of personnel required for measurement be reduced, but
By visually observing the display state of the current display circuit provided in the voltage converter at each measurement point, it is possible to prevent the risk of accidentally opening the CT circuit in the charged state, and from the secondary side of the CT. Since the output current is converted into a voltage by the voltage converter and does not flow directly into the measuring instrument operated by the measurer, the safety of the measurement work can be improved. Also, since it is not necessary to route a current circuit to the secondary side of the CT, the CT load at the time of measurement can be reduced, while in the measuring instrument, the input section connected to the voltage converter is used instead of switching the current circuit. Since it is configured to switch operation,
It is not necessary to make the measuring instrument large, and it is possible to reduce the size of the entire device. Furthermore, by selecting switching on the measuring instrument side, it is possible to continuously perform measurements at multiple measuring points. There is an effect that the measurement work can be performed quickly even in the case of a large number.

【図面の簡単な説明】[Brief description of drawings]

第１図はこの考案を具体化した実施例の電気回路図、第
２図は同じく計測器の電気回路図、第３図は同じく変換
器の電気回路図、第４図は計測器の斜視図、第５図は同
じく計測器の操作パネルの正面、第６図は変換器の斜視
図である。 図中、２は電圧変換回路、３は電流表示回路、１１は切
換回路としての変換器切換回路、２３ａはデジタル表示
部、３４ａはデジタル表示部、５０は電流計測回路、５
１は位相計測回路、Ａ１〜Ａ８は電圧変換器、Ｂは計測
器、ＣＴは変成器、Ｐ１１〜Ｐ１８は入力部である。1 is an electric circuit diagram of an embodiment embodying the present invention, FIG. 2 is an electric circuit diagram of the same measuring instrument, FIG. 3 is an electric circuit diagram of the same measuring instrument, and FIG. 4 is a perspective view of the measuring instrument. 5 is a front view of the operation panel of the measuring instrument, and FIG. 6 is a perspective view of the converter. In the figure, 2 is a voltage conversion circuit, 3 is a current display circuit, 11 is a converter switching circuit as a switching circuit, 23a is a digital display unit, 34a is a digital display unit, 50 is a current measurement circuit, 5
1 is a phase measuring circuit, A1 to A8 are voltage converters, B is a measuring device, CT is a transformer, and P11 to P18 are input sections.

───────────────────────────────────────────────────── フロントページの続き (72)考案者 足立 利幸 愛知県犬山市字上小針１番地 エナジーサ ポート株式会社内 (56)参考文献 特開 昭51−127441（ＪＰ，Ａ) 特公 昭63−67670（ＪＰ，Ｂ２) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Toshiyuki Adachi, No. 1 Kamikokonee, Inuyama City, Aichi Prefecture Energy Support Co., Ltd. (56) References Japanese Patent Publication No. (JP, B2)

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 【請求項１】複数の測定箇所毎に配置され、当該測定箇
所において接続された各相変成器の二次側出力を電圧変
換する電圧変換回路と、前記各相変成器の二次側が出力
状態にあるか否かを表示する電流表示回路とを備えた複
数個の電圧変換器と、 前記各電圧変換器と個々に接続される複数個の入力部、
それら各入力部のうち任意の一つの入力部を切換え選択
する切換回路、その切換え選択された入力部からの入力
信号に基づいて所定の電気的計測を行なう計測回路及び
その計測された結果を表示する表示部とを備えた１個の
計測器とから構成したことを特徴とする計器用変成器の
試験計測装置。1. A voltage conversion circuit which is arranged at each of a plurality of measurement points and which converts the secondary side output of each phase transformer connected at the measurement point into a voltage, and the secondary side of each phase transformer is in an output state. A plurality of voltage converters each having a current display circuit for displaying whether or not the plurality of input parts are individually connected to each of the voltage converters,
A switching circuit for switching and selecting any one of the input units, a measuring circuit for performing a predetermined electrical measurement based on an input signal from the selected input unit, and a display of the measured result An instrument transformer test and measurement device, comprising:
JP1989139740U 1989-11-30 1989-11-30 Test and measurement equipment for instrument transformers Expired - Lifetime JPH0620145Y2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1989139740U JPH0620145Y2 (en) 1989-11-30 1989-11-30 Test and measurement equipment for instrument transformers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1989139740U JPH0620145Y2 (en) 1989-11-30 1989-11-30 Test and measurement equipment for instrument transformers

Publications (2)

Publication Number Publication Date
JPH0378280U JPH0378280U (en) 1991-08-07
JPH0620145Y2 true JPH0620145Y2 (en) 1994-05-25

Family

ID=31686766

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1989139740U Expired - Lifetime JPH0620145Y2 (en) 1989-11-30 1989-11-30 Test and measurement equipment for instrument transformers

Country Status (1)

Country Link
JP (1) JPH0620145Y2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5855070B2 (en) * 2013-10-25 2016-02-09 三菱電機株式会社 Measuring apparatus and current transformer installation state determination method

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51127441A (en) * 1975-04-30 1976-11-06 Tokyo Electric Power Co Inc:The Sensor check circuit
JPS6367670A (en) * 1986-09-09 1988-03-26 Fujitsu Ltd Managing and processing system for occupation information on inter-system shared resources

Also Published As

Publication number Publication date
JPH0378280U (en) 1991-08-07

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