JPS6258215B2 - - Google Patents

Info

Publication number
JPS6258215B2
JPS6258215B2 JP10709781A JP10709781A JPS6258215B2 JP S6258215 B2 JPS6258215 B2 JP S6258215B2 JP 10709781 A JP10709781 A JP 10709781A JP 10709781 A JP10709781 A JP 10709781A JP S6258215 B2 JPS6258215 B2 JP S6258215B2
Authority
JP
Japan
Prior art keywords
winding
current
capacitor
secondary winding
current transformer
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
Application number
JP10709781A
Other languages
Japanese (ja)
Other versions
JPS589312A (en
Inventor
Mitsuo Sawairi
Shigeo Shiono
Yoshiaki Nanba
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.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP10709781A priority Critical patent/JPS589312A/en
Publication of JPS589312A publication Critical patent/JPS589312A/en
Publication of JPS6258215B2 publication Critical patent/JPS6258215B2/ja
Granted legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00Adaptations of transformers or inductances for specific applications or functions
    • H01F38/20Instruments transformers
    • H01F38/22Instruments transformers for single phase ac
    • H01F38/28Current transformers
    • H01F38/32Circuit arrangements
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00Adaptations of transformers or inductances for specific applications or functions
    • H01F38/20Instruments transformers
    • H01F38/22Instruments transformers for single phase ac
    • H01F38/28Current transformers
    • H01F38/30Constructions
    • H01F2038/305Constructions with toroidal magnetic core

Description

【発明の詳細な説明】 本発明は、変流器に係り特に高周波電流による
2次巻線保護装置を備えた変流器に関する。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a current transformer, and particularly to a current transformer equipped with a secondary winding protection device using high frequency current.

従来の変流器を第1,2図について説明する。 A conventional current transformer will be explained with reference to FIGS.

変電所においては、電源からしや断器1を通し
て、母線2へ、さらにしや断器3、変流器4を経
て負荷7へ電気が供給される。変流器4の2次側
には、保護リレー,メータのような負荷5が接続
されている。一方、真空しや断器のように開閉サ
ージが大きい場合、開閉サージによる機器の破損
を防止するため、サージアブソーバが接続され、
サージアブソーバとして、コンデンサ6を使用し
ている。
In the substation, electricity is supplied from the power supply through a power source disconnector 1 to a bus bar 2, and further via a power source disconnector 3 and a current transformer 4 to a load 7. A load 5 such as a protective relay or a meter is connected to the secondary side of the current transformer 4. On the other hand, in cases where switching surges are large, such as with vacuum shields or disconnectors, a surge absorber is connected to prevent equipment damage due to switching surges.
A capacitor 6 is used as a surge absorber.

しや断器3がOFFの場合、コンデンサ6の電
荷は、負荷7により消費され、零となつている。
しや断器3を投入すると、コンデンサ6には充電
電流I1が流れる。この回路を等価回路として簡略
化したのが第2図である。スイツチ3はしや断器
3に相当する。インダクタンス10、および抵抗
12は系統のインピーダンスを表わしている。変
流器4の2次側の抵抗13およびインダクタンス
14は負荷5を表わしている。
When the line breaker 3 is OFF, the charge in the capacitor 6 is consumed by the load 7 and becomes zero.
When the circuit breaker 3 is turned on, a charging current I 1 flows through the capacitor 6 . FIG. 2 shows a simplified equivalent circuit of this circuit. The switch 3 corresponds to a switch or disconnector 3. Inductance 10 and resistance 12 represent the impedance of the system. A resistance 13 and an inductance 14 on the secondary side of the current transformer 4 represent a load 5.

スイツチ3をONすると、コンデンサ6には充
電々流I1が流れる。この充電々流I1は商用周波数
50Hzに比較して非常に高周波で、数百KHzにな
り、電流の大きさは系統により異なるが、数百ア
ンペアとなる。このような高周波の電流I1が変流
器4の1次巻線16に流れると、変流器の2次巻
線18には、変流比に対応した電流I2が流れる。
50Hzの商用周波数の電流に対しては、電流I2
5A流れたとすると、定格負担を40VAとして2次
電圧V2は8V程度である。
When the switch 3 is turned on, a charging current I1 flows through the capacitor 6. This charging current I 1 is the commercial frequency
Compared to 50Hz, it has a very high frequency, several hundred KHz, and the magnitude of the current varies depending on the system, but it is several hundred amperes. When such a high-frequency current I 1 flows through the primary winding 16 of the current transformer 4, a current I 2 corresponding to the current transformation ratio flows through the secondary winding 18 of the current transformer.
For a current at a commercial frequency of 50Hz, the current I 2 is
If 5A flows, the rated load is 40VA and the secondary voltage V2 is about 8V.

しかし、高周波、例えば200KHzの電流I2が5A
流れた場合は、定格負担40VAで力率を0.8の遅れ
成分とすると、インピーダンスは50Hzに比較し、
約4000倍にもなり、2次電圧V2は非常な高電圧
となる。2次電圧V2は数kV以上となることがあ
り、低圧機器である負荷5たとえば半導体素子を
破損したり、保護リレー等を誤動作させたりす
る。特に最近は、エレクトロニクスを応用した保
護リレーやメータが多く、この2次電圧V2の高
電圧はサージとして大きな問題となる。
But at high frequency, for example 200KHz current I 2 is 5A
If it flows, if the rated load is 40VA and the power factor is a lagging component of 0.8, the impedance will be compared to 50Hz,
The voltage increases approximately 4000 times, and the secondary voltage V 2 becomes an extremely high voltage. The secondary voltage V 2 may exceed several kV and may damage the load 5, such as a semiconductor element, which is a low-voltage device, or cause a protective relay or the like to malfunction. Especially recently, there are many protective relays and meters that use electronics, and this high voltage of secondary voltage V2 becomes a big problem as a surge.

本発明の目的は、高周波電圧による変流器の2
次巻線側の破損を防止した変流器の2次巻線保護
装置を提供することにある。
The object of the present invention is to provide two current transformers using high frequency voltage.
It is an object of the present invention to provide a secondary winding protection device for a current transformer that prevents damage to the secondary winding side.

本発明の特徴は、1次巻線と2次巻線との間に
第3の巻線を巻回し、第3の巻線にコンデンサー
を設けた循環回路を設ければ、コンデンサは商用
周波数ではインピーダンスが大きく、高周波では
インピーダンスが小さくなるので、高周波電流は
循環回路内を流れる。従つて、2次巻線側にはほ
とんど高周波電流は流れないので、2次巻線側を
破損することがなくなつた。
The feature of the present invention is that if a third winding is wound between the primary winding and the secondary winding, and a circulation circuit is provided in which the third winding is provided with a capacitor, the capacitor will not operate at commercial frequencies. Since the impedance is large and the impedance becomes small at high frequencies, high frequency current flows in the circulating circuit. Therefore, since almost no high-frequency current flows through the secondary winding, there is no chance of damage to the secondary winding.

以下、本発明の実施例を第3A,3B図により
説明する。
Embodiments of the present invention will be described below with reference to FIGS. 3A and 3B.

ケース本体17に収納されている環状鉄心15
は、1次巻線16を、1次巻線上に第3の巻線2
0を、第3の巻線上に2次巻線18を、順次巻回
し、これらの巻線間と環状鉄心15との間に絶縁
物21を介在している。第3の巻線20はコンデ
ンサCと抵抗Rとを直列接続し、第3の巻線の両
端を接続点Aで接続して形成した循環回路22か
ら成る2次巻線保護回路を構成している。
Annular iron core 15 housed in case body 17
connects the primary winding 16 to the third winding 2 on top of the primary winding.
The secondary winding 18 is sequentially wound on the third winding of the coil 0, and an insulator 21 is interposed between these windings and the annular iron core 15. The third winding 20 constitutes a secondary winding protection circuit consisting of a circulation circuit 22 formed by connecting a capacitor C and a resistor R in series, and connecting both ends of the third winding at a connection point A. There is.

次に、2次巻線保護回路の作用について説明す
る。
Next, the operation of the secondary winding protection circuit will be explained.

商用周波数たとえば50(Hz)の時には、1次巻
線16に流れる正常電流I1により発生する磁束Φ
は、環状鉄心15を流れるので、2次巻線18
に、2次電流I2が流れるが、循環回路22には、
ほとんど電流I3は流れない。その理由は、一般に
コンデンサCは、商用周波数では、高インピーダ
ンスで、高周波では低インピーダンスであるから
である。従つて、循環回路22はコンデンサCに
よつて、高インピーダンスなので、電流I3はほと
んど流れない。
When the commercial frequency is 50 (Hz), for example, the magnetic flux Φ generated by the normal current I 1 flowing through the primary winding 16
flows through the annular core 15, so the secondary winding 18
Although the secondary current I 2 flows in the circulation circuit 22,
Almost no current I3 flows. This is because the capacitor C generally has high impedance at commercial frequencies and low impedance at high frequencies. Therefore, since the circulating circuit 22 has a high impedance due to the capacitor C, almost no current I 3 flows therethrough.

高周波たとえば200(kHz)の時には、コンデ
ンサCは、低インピーダンスになつているので、
高周波電流I1による電流I3は、ほとんど循環回路
内を循環する。従つて、高周波電流による高周波
電圧は、2次巻線18に移行するのを抑制でき
る。
At high frequency, for example 200 (kHz), capacitor C has low impedance, so
Most of the current I 3 due to the high frequency current I 1 circulates within the circulation circuit. Therefore, the high frequency voltage caused by the high frequency current can be suppressed from transferring to the secondary winding 18.

このため、電流I1が50(Hz)の時は、電流I3
零に等しいため、2次電流I2が変流比に対応した
電流となつて、普通の変流器として使用できる。
電流I1が高周波の時は、電流I3が大きくなり、循
環回路内を循環するため、2次電流I2は小さく、
2次電圧V2の大きさを押えることができる。従
つて、2次巻線側の負荷を破損することがない。
また、第3の巻線20は、1次巻線16と同様に
導線にて形成しているので、1次巻線を巻回後に
引続き同一巻線機で連続的に作業をすることがで
きる。従つて、作業能率がよいと共に、コンデン
サCは汎用品を使用できるので、CR定数を選定
する時に容易にできる。
Therefore, when the current I 1 is 50 (Hz), the current I 3 is equal to zero, so the secondary current I 2 becomes a current corresponding to the current transformation ratio, and it can be used as a normal current transformer.
When the current I 1 has a high frequency, the current I 3 becomes large and circulates in the circulation circuit, so the secondary current I 2 is small,
The magnitude of the secondary voltage V 2 can be suppressed. Therefore, the load on the secondary winding side will not be damaged.
In addition, since the third winding 20 is made of conductive wire in the same way as the primary winding 16, it can be continuously worked with the same winding machine after winding the primary winding. . Therefore, work efficiency is high, and since a general-purpose capacitor C can be used, the CR constant can be easily selected.

以上のように本発明によれば、高周波電圧を2
次巻線側に移行するのを抑制できるので、2次巻
線側が破損することが皆無となつた。
As described above, according to the present invention, the high frequency voltage is
Since the transfer to the next winding side can be suppressed, there is no chance of damage to the secondary winding side.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は従来の受変電系統の回路図、第2図は
第1図の等価回路図、第3A図は本発明の実施例
として示した変流器の等価回路図、第3B図は第
3A図および第4A図の1部を示す側断面図であ
る。 15…環状鉄心、16…1次巻線、17…ケー
ス本体、18…2次巻線、20…第3の巻線、C
…コンデンサ、R…抵抗、22…循環回路。
Fig. 1 is a circuit diagram of a conventional power receiving and substation system, Fig. 2 is an equivalent circuit diagram of Fig. 1, Fig. 3A is an equivalent circuit diagram of a current transformer shown as an embodiment of the present invention, and Fig. 3B is an equivalent circuit diagram of a current transformer shown as an embodiment of the present invention. 3A and 4A are side cross-sectional views showing a portion of FIG. 4A; FIG. 15... Annular iron core, 16... Primary winding, 17... Case body, 18... Secondary winding, 20... Third winding, C
...Capacitor, R...Resistor, 22...Circulation circuit.

Claims (1)

【特許請求の範囲】[Claims] 1 鉄心に絶縁物を介して1次巻線と2次巻線と
を配置した変流器において、上記1次巻線と2次
巻線との間に巻回した第3の巻線と、第3の巻線
に設けたコンデンサと、第3の巻線およびコンデ
ンサを流れる高周波電流を循環する循環回路とか
ら成る2次巻線保護装置を設けることを特徴とす
る変流器の2次巻線保護装置。
1. In a current transformer in which a primary winding and a secondary winding are arranged on an iron core via an insulator, a third winding wound between the primary winding and the secondary winding, A secondary winding of a current transformer characterized by being provided with a secondary winding protection device consisting of a capacitor provided in the third winding and a circulation circuit that circulates high frequency current flowing through the third winding and the capacitor. line protection device.
JP10709781A 1981-07-10 1981-07-10 Protective device for secondary winding of current transformer Granted JPS589312A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10709781A JPS589312A (en) 1981-07-10 1981-07-10 Protective device for secondary winding of current transformer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10709781A JPS589312A (en) 1981-07-10 1981-07-10 Protective device for secondary winding of current transformer

Publications (2)

Publication Number Publication Date
JPS589312A JPS589312A (en) 1983-01-19
JPS6258215B2 true JPS6258215B2 (en) 1987-12-04

Family

ID=14450376

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10709781A Granted JPS589312A (en) 1981-07-10 1981-07-10 Protective device for secondary winding of current transformer

Country Status (1)

Country Link
JP (1) JPS589312A (en)

Also Published As

Publication number Publication date
JPS589312A (en) 1983-01-19

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