JP2599806B2 - Transformer current transformer for instrument - Google Patents
Transformer current transformer for instrumentInfo
- Publication number
- JP2599806B2 JP2599806B2 JP2080613A JP8061390A JP2599806B2 JP 2599806 B2 JP2599806 B2 JP 2599806B2 JP 2080613 A JP2080613 A JP 2080613A JP 8061390 A JP8061390 A JP 8061390A JP 2599806 B2 JP2599806 B2 JP 2599806B2
- Authority
- JP
- Japan
- Prior art keywords
- transformer
- load
- instrument
- current
- adjustment
- 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
Links
Landscapes
- Transformers For Measuring Instruments (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ この発明は、計器用変圧変流器、特に広域負担におけ
る誤差保証が可能な計器用変圧変流器に関するものであ
る。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer for an instrument, and more particularly to a transformer for an instrument capable of guaranteeing an error over a wide area.
［従来の技術］ 第２図は従来の計器用変圧変流器を示す回路図であ
り、図において（１）は負担であり、例えば電力量を測
定する積算電力量計等である。（２）はこの負担（１）
と電気的に接続された端子箱であり、計器用変圧変流器
の２次側端子の引出口が設けられている。（３）は計器
用変圧変流器（一般にPCTと呼ぶ）の本体であり、高電
圧を低電圧に変成する計器用変圧器VTと、大電流を小電
流に変成する２個の変流器CT1,CT2とから構成されてい
る。なお、計器用変圧器VTの１次巻線は電源側端子UK,V
K,WKに接続され、２次巻線は端子箱（２）の２次側端子
引出口u,v,wに接続されている。また、変流器CT1の１次
巻線は電源側端子UKおよび負荷側端子UL間に接続され、
２次巻線は端子箱（２）の２次側端子引出口kuおよびlu
に接続されている。変流器CT2の１次巻線は電源側端子W
Kおよび負荷側端子WL間に接続され、２次巻線は端子箱
（２）の２次側端子引出口kwおよびlwへ接続されてい
る。[Prior Art] FIG. 2 is a circuit diagram showing a conventional voltage transformer for an instrument. In FIG. 2, (1) is a burden, for example, an integrated watt-hour meter for measuring electric power. (2) is this burden (1)
The terminal box is electrically connected to the terminal box, and is provided with an outlet of the secondary terminal of the voltage transformer. (3) is the main body of the transformer for the instrument (generally called PCT), the transformer VT for transforming the high voltage to the low voltage, and the two transformers for transforming the large current to the small current. CT 1 and CT 2 . The primary winding of the instrument transformer VT is connected to the power supply terminals UK, V
K, WK, and the secondary winding is connected to the secondary terminal outlets u, v, w of the terminal box (2). The primary winding of the current transformer CT 1 is connected between the power supply terminal UK and the load terminal UL,
The secondary winding is connected to the secondary terminal outlets ku and lu of the terminal box (2).
It is connected to the. The primary winding of the current transformer CT 2 is the terminal W on the power supply side.
The secondary winding is connected between K and the load-side terminal WL, and the secondary winding is connected to the secondary-side terminal outlets kw and lw of the terminal box (2).
従来の計器用変圧変流器は上述したように構成され、
本体（３）の電源側端子UK,VK,WKに３相高電圧が印加さ
れると、それは計器用変圧器VTによって低電圧に変成さ
れ、その低電圧は端子箱（２）を介して負担例えば積算
電力量計（１）に入力される。電源側端子UKおよび負荷
側端子UL間に流れるＵ相大電流は変流器CT1によって小
電流に変成され、端子箱（２）を介して負担（１）へ入
力される。また電源側端子WKと負荷側端子WL間に流れる
Ｗ相大電流は変流器CT2によって小電流に変成され、端
子箱（２）を介して負担（１）へ入力される。これらの
入力により負担（１）で電力量が測定される。A conventional instrument transformer is configured as described above,
When a three-phase high voltage is applied to the power supply terminals UK, VK, WK of the main unit (3), it is transformed into a low voltage by the instrument transformer VT, and the low voltage is borne through the terminal box (2). For example, it is input to the integrated watt hour meter (1). Line terminal UK and load terminal U-phase high current flowing between UL is transformed into a small current by the current transformer CT 1, is input via terminal box (2) to bear (1). The W-phase high current flowing through the power supply-side terminal WK between the load terminal WL is transformed into a small current by the current transformer CT 2, is input through terminal box (2) to bear (1). With these inputs, the electric energy is measured with the burden (1).
しかしながら、この電力量測定値には計器用変圧器VT
および変流器CT1,CT2の単体誤差並びにこれらに起因す
る組合せ誤差が含まれており、その精度はJIS規格のC17
36（1980年）によって厳しく規定されている。一方、誤
差（ε）と定格（VA）の間には、ε∝VAなる関係があ
り、負担（１）が広域に亘って変動する場合、誤差
（ε）は大きく変わる。従って、負担特性を守りかつ単
体誤差を小さくするためには、変圧器VT,変流器CT1,CT2
の鉄損，銅損を極力小さくしなければならない。そのた
めには鉄芯材を低鉄損材にしたり、断面積を大きくした
り、また、巻線を太くしたりしなければならない。However, this energy measurement does not include the instrument transformer VT.
And the errors of the current transformers CT 1 and CT 2 and the combination errors resulting therefrom are included.
36 (1980). On the other hand, there is a relationship of εεVA between the error (ε) and the rating (VA), and when the load (1) varies over a wide area, the error (ε) greatly changes. Therefore, in order to reduce the defense and single error burden characteristics, transformer VT, current transformer CT 1, CT 2
Iron loss and copper loss must be minimized. For that purpose, the iron core material must be made a low iron loss material, the sectional area must be increased, and the winding must be thick.
［発明が解決しょうとする課題］ 上述したような従来の計器用変圧変流器では、広域な
負担を保証するために、鉄芯の断面積および導体（巻
線）の断面積を大きくしたり、更には鉄芯材を低損失材
にしたりする必要があり、すなわち、体積が大きく、高
価なものになると云う問題点があった。[Problems to be Solved by the Invention] In the conventional transformer for current transformer as described above, in order to guarantee a wide load, the sectional area of the iron core and the sectional area of the conductor (winding) are increased. In addition, there is a problem that the iron core material needs to be made of a low loss material, that is, it is large in volume and expensive.
この発明は、このような問題点を解決するためになさ
れたもので、広域負担の全域に亘って誤差の変動幅が小
さく、小型でしかも安価な計器用変圧変流器を得ること
を目的とする。The present invention has been made to solve such a problem, and an object of the present invention is to obtain a small and inexpensive instrument-use current transformer with a small fluctuation range of an error over a wide range of burden. I do.
［問題点を解決するための手段］ この発明に係る計器用変圧変流器は、計器用変圧器の
出力側に並列に設けられた入，切可能な調整用負担およ
び変流器の出力側に直列に設けられた入，切可能な調整
用負担と、これらの調整用負担を入，切する切替スイッ
チとを備えている。[Means for Solving the Problems] A transformer for an instrument according to the present invention comprises an on / off switchable adjusting load and an output side of a current transformer provided in parallel on the output side of the instrument transformer. And an adjustment load that can be turned on and off in series, and a changeover switch that turns on and off these adjustment loads.
［作 用］ この発明においては、負担が小さい領域では２次側に
調整用負担を接続して負担を増し、負担が大きい領域で
は調整用負担を切り離すことによって負担の変動幅が小
さく抑えられる。[Operation] In the present invention, in a region where the load is small, the adjustment load is connected to the secondary side to increase the load, and in a region where the load is large, the fluctuation range of the load is suppressed to be small by separating the adjustment load.
［実施例］ 第１図はこの発明の一実施例を示す回路図であり、
（１）〜（３）は従来装置におけるものと全く同一のも
のである。（４），（５）は計器用変圧器VTNCための第
１の調整用負担であり、計器用変圧器VTの２次巻線の各
半分に、従ってそれぞれP1,P2間、P2,P3間に第１の入切
手段例えば切替スイッチ（8a），（8b）を介して並列に
接続される。（６），（７）は変流器CT1,CT2のための
第２の調整用負担であり、変流器CT1,CT2の２次巻線の
一端に、従って1S,3Sにそれぞれ第２の入切手段例えば
切替スイッチ（8c），（8d）と共に接続される。FIG. 1 is a circuit diagram showing an embodiment of the present invention.
(1) to (3) are exactly the same as those in the conventional apparatus. (4), (5) is a first adjusting load for instrumentation transformer VTNC, each half of the secondary winding of a voltage transformer VT, therefore P 1, respectively, between P 2, P 2 , the first on-off means such as changeover switch between P 3 (8a), are connected in parallel via (8b). (6), (7) is a second adjustment burden for the current transformer CT 1, CT 2, one end of the current transformer CT 1, CT 2 of the secondary winding, thus 1S, the 3S Each is connected together with second on / off means, for example, changeover switches (8c) and (8d).
次に第１図に示した計器用変圧変流器の動作について
説明する。計器用変圧器VT、変流器CT1,CT2の作用は、
従来の計器用変圧変流器と全く同様で、計器用変圧器VT
は電源側の高電圧を低電圧に変成し、変流器CT1,CT2は
電源側の大電流を小電流に変成する。負担（１）は従来
の積算電力量計等の大負担の場合と、近年のディジタル
式積算電力計等の小負担の場合があり、先ず大負担の場
合について考える。計器用変圧器VTの２次側の出力はそ
のまゝ負担（１）へ入力され、変流器CT1,CT2の２次側
の出力は切替スイッチ（8c），（8d）を介して負担
（１）に入力される。一方、小負担の場合は、計器用変
圧器VTの２次側に対し、切替スイッチ（8a），（8b）を
介して調整用負担（４），（５）が並列に接続され、変
流器CT1,CT2の２次側に対し、切替スイッチ（8c），（8
d）を介して、調整用負担（６），（７）が直列に接続
される。以上の事により、負担（１）が大負担から小負
担まで変化しても、計器用変圧器VTの負担は調整用負担
（４），（５）の切替スイッチ（8a），（8b）による
入，切により、負担変動幅が小さく抑えられ、出力電圧
変動も小さく抑えられる。また、変流器CT1,CT2の負担
も調整用負担（６），（７）の入，切により、負担変動
幅が小さく抑えられ、出力電流変動も小さく抑えられ
る。このようにして負担変動に対する単体誤差が小さく
なるため、組合せ誤差すなわち計器用変圧変流器の誤差
が小さくなる。Next, the operation of the instrument transformer shown in FIG. 1 will be described. The functions of the instrument transformer VT and the current transformers CT 1 and CT 2 are as follows.
Exactly the same as the conventional transformer for current transformer, the transformer for instrument VT
Transforms the high voltage on the power supply side into a low voltage, and the current transformers CT 1 and CT 2 transform the large current on the power supply side into a small current. The burden (1) may be a heavy load such as a conventional integrated watt-hour meter, or a small load such as a digital integrated watt-hour in recent years. The output of the secondary side of the instrumentation transformer VT is inputted thereof orゝburden to (1), the output of the secondary side of the current transformer CT 1, CT 2 selector switch (8c), via a (8d) It is input to burden (1). On the other hand, in the case of a small load, the adjustment loads (4) and (5) are connected in parallel to the secondary side of the instrument transformer VT via the changeover switches (8a) and (8b). to the secondary side of the vessel CT 1, CT 2, changeover switch (8c), (8
Via d), the adjustment loads (6), (7) are connected in series. As described above, even if the burden (1) changes from a large burden to a small burden, the burden on the instrument transformer VT is changed by the changeover switches (8a) and (8b) of the adjustment burdens (4) and (5). By turning on and off, the fluctuation width of the load is suppressed small, and the fluctuation of the output voltage is also suppressed small. Also, the load on the current transformers CT 1 and CT 2 can be reduced by the on / off of the adjustment loads (6) and (7), so that the load variation width is reduced and the output current variation is also reduced. In this way, the single error with respect to the load change is reduced, so that the combination error, that is, the error of the instrument transformer is reduced.
すなわち積算電力量計の広域負担の誤差変動幅が小さ
くなり、高精度な計器用変圧変流器を得ることができ
る。That is, the error fluctuation width of the wide-area load of the integrated watt-hour meter is reduced, and a high-precision voltage transformer for a current transformer can be obtained.
また、従来の技術では、負担特性を守りかつ単体誤差
を小さくするためには、計器用変圧器VTと変流器CT1,CT
2の鉄損、銅損を極力小さくしなければならず、このた
めに、鉄芯材を低鉄損材にしたり、断面積を大きくした
り、また、巻線を太くしたりする解決策が必要となる
が、この発明により、そのような解決策が不要になるの
で、小型で安価な計器用変圧変流器を得ることができ
る。Also, in the conventional technology, in order to protect the burden characteristic and reduce the unit error, the transformer VT for the instrument and the current transformers CT 1 , CT
(2 ) Iron loss and copper loss must be reduced as much as possible.Therefore, there are solutions to reduce the iron core material to a low iron loss material, increase the cross-sectional area, and make the winding thicker. Although necessary, the present invention eliminates the need for such a solution, so that a compact and inexpensive transformer for transformer can be obtained.
なお、上記実施例では、調整用負担を低圧側端子箱に
設けたが、PCT本体の中に設け、調整用負担のタップの
みを低圧側端子箱内に設けてもよい。In the above embodiment, the adjustment load is provided on the low-voltage terminal box. However, the adjustment load may be provided in the PCT main body, and only the adjustment load tap may be provided in the low-voltage terminal box.
［発明の効果］ この発明は、以上説明したとおり、計器用変圧器およ
び変流器と、計器用変圧器の出力側に並列に設けられて
入、切可能な第１の調整用負担および変流器の出力側に
直列に設けられて入、切可能な第２の調整用負担と、第
１、第２の調整用負担をそれぞれ入、切する第１、第２
の入切手段とを備え、第１および第２の調整用負担の出
力側に接続された負担が大きい場合には、第１および第
２の入切手段により第１および第２の調整用負担を切に
し、第１および第２の調整用負担の出力側に接続された
負担が小さい場合には、第１および第２の入切手段によ
り第１および第２の調整用負担を入にするので、計器用
変圧器の負担変動幅が小さく抑えられ、出力電圧変動も
小さく抑えられる共に、変流器の負担変動幅が小さく抑
えられ、出力電流変動も小さく抑えられる。このように
して負担変動に対する単体誤差が小さくなるため、組合
せ誤差すなわち計器用変圧変流器の誤差が小さくなる。
すなわち積算電力量計の広域負担の誤差変動幅が小さく
なり、高精度な計器用変圧変流器を得ることができる。[Effects of the Invention] As described above, the present invention provides a first transformer and a transformer which are provided in parallel on the output side of an instrument transformer and a current transformer and can be turned on and off. A second adjustment load, which is provided in series on the output side of the flow device and can be turned on and off, and first and second loads for turning on and off the first and second adjustment loads, respectively.
When the load connected to the output side of the first and second adjustment loads is large, the first and second on / off means provide the first and second adjustment loads. Is turned off, and when the load connected to the output side of the first and second adjustment loads is small, the first and second adjustment loads are turned on by the first and second on / off means. Therefore, the load fluctuation range of the instrument transformer can be suppressed small, and the output voltage fluctuation can be also suppressed small, and the load fluctuation range of the current transformer can be suppressed small, and the output current fluctuation can also be suppressed. In this way, the single error with respect to the load change is reduced, so that the combination error, that is, the error of the instrument transformer is reduced.
That is, the error fluctuation width of the wide-area load of the integrated watt-hour meter is reduced, and a high-precision voltage transformer for a current transformer can be obtained.
また、従来の技術では、負担特性を守りかつ単体誤差
を小さくするためには、計器用変圧器と変流器の鉄損、
銅損を極力小さくしなければならず、このために、鉄芯
材を低鉄損材にしたり、断面積を大きくしたり、また、
巻線を太くしたりする解決策が必要となるが、この発明
により、そのような解決策が不要になるので、小型で安
価な計器用変圧変流器を得ることができるという効果を
奏する。Further, in the conventional technology, in order to protect the burden characteristic and reduce the unit error, iron loss of the transformer for the instrument and the current transformer,
Copper loss must be reduced as much as possible, and for this, iron core material is made low iron loss material, cross-sectional area is increased,
Although a solution for increasing the thickness of the winding is required, such a solution is not required according to the present invention, so that there is an effect that a compact and inexpensive transformer for current transformer can be obtained.
第１図はこの発明の一実施例を示す回路図、第２図は従
来の計器用変圧変流器を示す回路図である。 図において、（４）〜（７）は調整用負担、（8a）〜
（8d）は切替スイッチ、VTは計器用変圧器、CT1,CT2は
変流器である。 なお、各図中、同一符号は同一または相当部分を示す。FIG. 1 is a circuit diagram showing one embodiment of the present invention, and FIG. 2 is a circuit diagram showing a conventional voltage transformer for an instrument. In the figure, (4) to (7) are adjustment burdens, and (8a) to
(8d) selector switch, VT is a voltage transformer, CT 1, CT 2 are current transformers. In the drawings, the same reference numerals indicate the same or corresponding parts.
Claims (1)
変圧器の出力側に並列に設けられて入、切可能な第１の
調整用負担および前記変流器の出力側に直列に設けられ
て入、切可能な第２の調整用負担と、前記第１、第２の
調整用負担をそれぞれ入、切する第１、第２の入切手段
とを備え、前記第１および第２の調整用負担の出力側に
接続された負担が大きい場合には、前記第１および第２
の入切手段により前記第１および第２の調整用負担を切
にし、前記第１および第２の調整用負担の出力側に接続
された負担が小さい場合には、前記第１および第２の入
切手段により前記第１および第２の調整用負担を入にす
ることを特徴とする計器用変圧変流器。1. An instrument transformer and a current transformer, and a first adjusting load, which is provided in parallel at an output side of the instrument transformer and can be turned on and off, and is serially connected to an output side of the current transformer. A second adjustment load, which can be turned on and off, and first and second on / off means for turning on and off the first and second adjustment loads, respectively. If the load connected to the output side of the second adjustment load is large, the first and second
The first and second adjustment loads are turned off by the on / off means. If the load connected to the output side of the first and second adjustment loads is small, the first and second adjustment loads are turned off. A transformer for an instrument, wherein the first and second adjustment loads are turned on by on / off means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2080613A JP2599806B2 (en) | 1990-03-30 | 1990-03-30 | Transformer current transformer for instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2080613A JP2599806B2 (en) | 1990-03-30 | 1990-03-30 | Transformer current transformer for instrument |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03283416A JPH03283416A (en) | 1991-12-13 |
| JP2599806B2 true JP2599806B2 (en) | 1997-04-16 |
Family
ID=13723188
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2080613A Expired - Lifetime JP2599806B2 (en) | 1990-03-30 | 1990-03-30 | Transformer current transformer for instrument |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2599806B2 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2833203A1 (en) * | 1978-07-27 | 1980-02-07 | Siemens Ag | MEASURING CONVERTER WITH A PRIMARY DEVELOPMENT FLOWING FROM A CURRENT TO BE MEASURED |
| JPH028515U (en) * | 1988-06-28 | 1990-01-19 |
-
1990
- 1990-03-30 JP JP2080613A patent/JP2599806B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03283416A (en) | 1991-12-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3818402A (en) | Tap-changing series-multiple transformer system | |
| Kramer et al. | Transformers for phase angle regulation considering the selection of on-load tap-changers | |
| US4156174A (en) | Phase-angle regulator | |
| US4749941A (en) | Circuit arrangement for a meter for measuring two electrical quantities | |
| JP2599806B2 (en) | Transformer current transformer for instrument | |
| US3454866A (en) | Regulating transformer arrangement with tap changing means | |
| US3781667A (en) | High voltage resonant testing circuit | |
| JPS5863864A (en) | Curpent/voltage converting circuit | |
| CN209071248U (en) | Breaker | |
| JP3071787B1 (en) | Three-phase to single-phase converter. | |
| CN109326491A (en) | Breaker | |
| JP2642825B2 (en) | Single phase load tap change transformer | |
| Boyajian et al. | Orthomagnetic bushing current transformer for metering | |
| US20230353059A1 (en) | Phase shifting transformers comprising a single coil for two exciting windings for voltage regulation and for phase shift angle regulation | |
| HU190346B (en) | Electric current measuring circuit arrangement | |
| LUBIS | Impedance characteristics of power transformers in terms of their regulation | |
| US717496A (en) | Method of measuring the energy of three-phase alternating-current circuits. | |
| SU1226333A2 (en) | Device for determining 90-degree phase shift | |
| US2996671A (en) | Watt meter system | |
| JPH10144541A (en) | Burden device for instrument transformer | |
| JPS6140621A (en) | On-load adjuster | |
| RU2054786C1 (en) | Single-phase-to-three-phase voltage changer | |
| US3312896A (en) | Transformer phase converter adapted to have wattmeter current terminals connected inseries with primary to measure total power supplied | |
| SU1737355A2 (en) | Method of determining active power of the ac high-voltage line | |
| JP2001110661A (en) | Transformer for standar gas insulated instrument |