JPH0328804B2 - - Google Patents
Info
- Publication number
- JPH0328804B2 JPH0328804B2 JP57186113A JP18611382A JPH0328804B2 JP H0328804 B2 JPH0328804 B2 JP H0328804B2 JP 57186113 A JP57186113 A JP 57186113A JP 18611382 A JP18611382 A JP 18611382A JP H0328804 B2 JPH0328804 B2 JP H0328804B2
- Authority
- JP
- Japan
- Prior art keywords
- transformer
- transfer function
- time constant
- compensation circuit
- series compensation
- 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
- 239000003990 capacitor Substances 0.000 claims description 9
- 238000004804 winding Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/42—Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils
- H01F27/422—Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils for instrument transformers
- H01F27/425—Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils for instrument transformers for voltage transformers
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、交流モータの端子電圧検出用変圧器
に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a transformer for detecting terminal voltage of an AC motor.
一般に、交流モータの端子電圧検出用変圧器
は、小容量のもので充分であるが、低周波領域ま
で、精度を落とさずに検出しようとする場合、変
圧器１次巻線時定数を大きくすることが考えられ
る。
In general, a small-capacity transformer for detecting the terminal voltage of an AC motor is sufficient, but if you want to detect low frequency ranges without sacrificing accuracy, the time constant of the primary winding of the transformer must be increased. It is possible that
すなわち、１次巻線を太くしたり、巻数を多く
すれば、低周波領域における精度を向上させるこ
とができるが、太さもコストも増大してしまうと
いう欠点があつた。例えば標準形10VA変圧器
で、１Hzの周波数での位相誤差を５％以内におさ
えようとして、１次巻線を太くし、且つ多く巻く
と、500VA変圧器相当の大きさになつてしまう
ことが本発明者によつて確かめられている。 That is, by making the primary winding thicker or increasing the number of turns, accuracy in the low frequency range can be improved, but this has the drawback of increasing the thickness and cost. For example, in a standard 10VA transformer, if you make the primary winding thicker and wind more in order to suppress the phase error at a frequency of 1Hz to within 5%, the transformer will become as large as a 500VA transformer. This has been confirmed by the inventor.
本発明は、巻線等には、何ら細工せずに、変圧
器２次側に直列補償回路を設け、ゲイン・位相を
調整することによつて上記の欠点がなく、しかも
特に低周波領域での精度が向上する計器用変圧器
を提供しようとするものである。
The present invention eliminates the above drawbacks by providing a series compensation circuit on the secondary side of the transformer and adjusting the gain and phase without any modifications to the windings, etc., and moreover, especially in the low frequency region. The present invention aims to provide a voltage transformer with improved accuracy.
本発明は上記の問題点を解決するため、
伝達関数G1（Ｓ）が
G1（Ｓ）＝ST1／１＋ST1
但し、T1：時定数
Ｓ：ラプラス演算子
である交流モータの端子電圧検出用変圧器Ａの２
次側に、伝達関数G2（Ｓ）が
G2（Ｓ）＝Ｋ１＋STc／１＋ST2
但し、Tc：時定数
T2：T1より大きい時定数
Ｋ：比例定数
で表わされる増巾器、抵抗、コンデンサ等からの
構成される回路であつて、この伝達関数G2（Ｓ）
の比例定数Ｋが
Ｋ＝T2／T1
時定数Tcが
Tc＝T1
となるように前記抵抗、コンデンサ等の値を設定
した直列補償回路Ｂを接続したものである。
In order to solve the above - mentioned problems, the present invention solves the above problems. Detection transformer A-2
On the next side, the transfer function G 2 (S) is G 2 (S) = K1 + ST c /1 + ST 2 where, T c : time constant T 2 : time constant larger than T 1 K : amplifier expressed by proportionality constant; It is a circuit composed of resistors, capacitors, etc., and this transfer function G 2 (S)
A series compensation circuit B is connected in which the values of the resistors, capacitors, etc. are set so that the proportionality constant K is K=T 2 /T 1 and the time constant T c is T c =T 1 .
以下本発明の実施例について説明する。 Examples of the present invention will be described below.
第１図は実施例の電気回路を示すもので、Ａは
変圧器、Ｂは抵抗１〜３、コンデンサ４及び増巾
器５から成る直列補償回路である。なお、抵抗１
〜３の値は、それぞれr3、r4、r5とする。 FIG. 1 shows the electrical circuit of the embodiment, where A is a transformer, B is a series compensation circuit consisting of resistors 1 to 3, a capacitor 4, and an amplifier 5. In addition, resistance 1
The values of ~3 are r3 , r4 , and r5, respectively.
今変圧器Ａだけでモータの端子電圧を検出する
場合を考え、変圧器自体の伝達関数をG1（Ｓ）と
し、変圧器の１次抵抗をr1、１次インダクタンス
をl1として、l1／r1をT1とおくと、G1（Ｓ）は式
G1（Ｓ）＝ST1／１＋ST1で表わされる。 Now consider the case where the terminal voltage of the motor is detected using only transformer A. Let the transfer function of the transformer itself be G 1 (S), let the primary resistance of the transformer be r 1 , and let the primary inductance be l 1 . When 1 /r 1 is set as T 1 , G 1 (S) is expressed by the formula G 1 (S)=ST 1 /1+ST 1 .
但し、変圧器伝達比（巻線比）は１：１と
し、２次側に流れる電流は、きわめて小さいもの
とし、変圧器の２次抵抗r2と２次インダクタンス
l2の影響は無視している。 However, the transformer transmission ratio (turning ratio) is 1:1, the current flowing to the secondary side is extremely small, and the transformer's secondary resistance r 2 and secondary inductance are
The influence of l 2 is ignored.
この場合のG1（Ｓ）の周波数特性をボード線図
に示すと、第２図において実線で示すようにな
る。この図より低周波領域でのゲイン低下と位相
ずれが著しいことがわかる。 When the frequency characteristic of G 1 (S) in this case is shown in a Bode diagram, it is shown by a solid line in FIG. It can be seen from this figure that the gain decrease and phase shift are significant in the low frequency region.
次に変圧器Ａの２次側に第１図に示すような直
列補償回路Ｂを付加した実施例の場合について考
える。 Next, consider an embodiment in which a series compensation circuit B as shown in FIG. 1 is added to the secondary side of the transformer A.
図示の直列補償回路Ｂの伝達関数G2（Ｓ）は、 G2（Ｓ）＝Ｋ１＋STc／１＋ST2と表わされる。 The transfer function G 2 (S) of the illustrated series compensation circuit B is expressed as G 2 (S)=K1+ST c /1+ST 2 .
但し、Tc＝cr4、T2＝ｃ（r4＋r5）、Ｋ＝r5／r3
である。 However, Tc=cr 4 , T 2 =c(r 4 +r 5 ), K=r 5 /r 3
It is.
すると、実施例における全体の伝達関数Ｇ（Ｓ）
は、Ｇ（Ｓ）＝G1（Ｓ）G2（Ｓ）＝ST1／１＋ST1・Ｋ
１＋STc／１＋ST2
と表わされることになる。 Then, the overall transfer function G(S) in the example
is expressed as G(S)=G 1 (S)G 2 (S)=ST 1 /1+ST 1 ·K 1+ST c /1+ST 2 .
ここで式T1＝Tc及び式Ｋ＝r5／r3＝T2／T1を満足す るようＣ、r3、r4、r5を選ぶと、 Ｇ（Ｓ）＝ST2／１＋ST2となる。 Here, if C, r 3 , r 4 , and r 5 are selected to satisfy the formula T 1 = T c and the formula K = r 5 /r 3 =T 2 /T 1 , then G(S) = ST 2 /1 + ST It becomes 2 .
上式中にはT1＜T2（∵Cr5＜Ｃ（r5＋r4）なる関
数があるから、周波数特性は変圧器Ａのみの場合
と比較して第２図の点線に示すごとく著しく改善
されることになる。 Since there is a function T 1 < T 2 (∵Cr 5 < C(r 5 + r 4 ) in the above equation, the frequency characteristics are significantly different from the case of only transformer A, as shown by the dotted line in Figure 2. It will be improved.
即ち、変圧器Ａの２次側に伝達関数G2（Ｓ）が
G2（Ｓ）＝T2／T1・１＋ST1／１＋ST2
但し、T1：変圧器の伝達関数を
Ｇ（Ｓ）＝ST1／１＋ST1
と表わした場合の時定数
T2：前記T1より大なる値の時定数
の直列補償回路Ｂを付加することにより、全体の
特性を著しく改善することができる。 That is, the transfer function G 2 (S) on the secondary side of transformer A is G 2 (S) = T 2 /T 1・1 + ST 1 /1 + ST 2 However, T 1 is the transfer function of the transformer G (S) Time constant T2 when expressed as = ST1 /1+ ST1 : By adding a series compensation circuit B having a time constant larger than T1 , the overall characteristics can be significantly improved.
なお、ここでは直列補償回路Ｂとして、抵抗１
〜３、コンデンサ４及び増巾器５を用いた場合の
実施例を示したが、本発明はこの海路のみに限定
されるものではなく、前記の伝達関数で表わされ
るものならば、他の構成のものでもよい。例え
ば、コンデンサ４に代えてコイルを用いたもので
もよい。しかし乍ら、コイルはコンデンサと違つ
て任意の値のものが市販されていないので、コイ
ルを用いた回路を用いる構成は実用的ではない。 In addition, here, as series compensation circuit B, resistor 1
3. Although an embodiment using the capacitor 4 and the amplifier 5 has been shown, the present invention is not limited to this sea route, and may be applied to other configurations as long as they are expressed by the transfer function described above. It can also be from. For example, a coil may be used instead of the capacitor 4. However, unlike capacitors, coils with arbitrary values are not commercially available, so a configuration using a circuit using coils is not practical.
以上述べたように、本発明によれば、巻線等を
細工することなく、低周波域での周波数特性を改
善できるので、標準トランスを用いて高精度の検
出が可能となり、その工業的価値は大きいもので
ある。
As described above, according to the present invention, it is possible to improve the frequency characteristics in the low frequency range without modifying the windings, etc., making it possible to perform highly accurate detection using a standard transformer, and its industrial value. is a big one.
第１図は、本発明の実施例の電気回路図、第２
図は周波数特性を示すボード線図で、実線が従来
の変圧器Ａのみの場合、点線が本発明の直列補償
回路Ｂを付加した場合である。
Ａ……変圧器、Ｂ……直列補償回路、１〜３…
…抵抗、４……コンデンサ、５……増巾器。
FIG. 1 is an electrical circuit diagram of an embodiment of the present invention, and FIG.
The figure is a Bode diagram showing frequency characteristics, where the solid line shows the case where only the conventional transformer A is used, and the dotted line shows the case where the series compensation circuit B of the present invention is added. A...Transformer, B...Series compensation circuit, 1 to 3...
...resistor, 4...capacitor, 5...amplifier.
Claims (1)
次側に、伝達関数G2（Ｓ）が G2（Ｓ）＝Ｋ１＋STc／１＋ST2 但し、Tc：時定数 T2：T1より大きい時定数 Ｋ：比例定数 で表わされる増巾器、抵抗、コンデンサ等から構
成される回路であつて、この伝達関数G2（Ｓ）の
比例定数Ｋが Ｋ＝T2／T1 時定数Tcが Tc＝T1 となるように前記抵抗、コンデンサ等の値を設定
した直列補償回路Ｂを接続したことを特徴とする
交流モータの端子電圧検出用変圧器。[Claims] 1 Transformer A for detecting terminal voltage of an AC motor, where the transfer function G 1 (S) is G 1 (S) = ST 1 /1 + ST 1 , where T 1 : time constant S : Laplace operator 2
On the next side, the transfer function G 2 (S) is G 2 (S) = K1 + ST c /1 + ST 2 where, T c : time constant T 2 : time constant larger than T 1 K : amplifier expressed by proportionality constant; The circuit is composed of a resistor, a capacitor, etc., and the resistor is connected so that the proportionality constant K of this transfer function G 2 (S) is K=T 2 /T 1 and the time constant T c is T c =T 1 . A transformer for detecting terminal voltage of an AC motor, characterized in that a series compensation circuit B is connected to which the value of a capacitor, etc. is set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57186113A JPS5975614A (en) | 1982-10-25 | 1982-10-25 | Voltage transformer provided with series compensating circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57186113A JPS5975614A (en) | 1982-10-25 | 1982-10-25 | Voltage transformer provided with series compensating circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5975614A JPS5975614A (en) | 1984-04-28 |
| JPH0328804B2 true JPH0328804B2 (en) | 1991-04-22 |
Family
ID=16182584
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57186113A Granted JPS5975614A (en) | 1982-10-25 | 1982-10-25 | Voltage transformer provided with series compensating circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5975614A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0685381B2 (en) * | 1985-01-29 | 1994-10-26 | 横河電機株式会社 | Current transformer |
| JPS62233092A (en) * | 1986-04-02 | 1987-10-13 | Yaskawa Electric Mfg Co Ltd | Compensating circuit for low-frequency characteristic of detection transformer for ac motor |
| JPS62267670A (en) * | 1986-05-15 | 1987-11-20 | Fuji Electric Co Ltd | Current detecting circuit |
| JPS6321865U (en) * | 1986-07-25 | 1988-02-13 | ||
| JPH0660913B2 (en) * | 1987-03-19 | 1994-08-10 | 凌和電子株式会社 | High frequency current measurement method |
| CN109932578B (en) * | 2017-12-15 | 2024-04-02 | 广州西门子能源变压器有限公司 | Method and device for carrying out temperature rise test on transformer to be tested |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5332060B2 (en) * | 1974-03-28 | 1978-09-06 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5548446Y2 (en) * | 1976-08-25 | 1980-11-12 |
-
1982
- 1982-10-25 JP JP57186113A patent/JPS5975614A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5332060B2 (en) * | 1974-03-28 | 1978-09-06 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5975614A (en) | 1984-04-28 |
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