JPS5823424A - Current transformer - Google Patents

Abstract

PURPOSE:To allow performing an overload by capacitor element breakdown in the range of capacity which is impossible by current limiting fuses easily and economically, by incorporating a current tansformer wherein lamination thickness is constituted small into a high voltage capacitor with good space factor. CONSTITUTION:In the figure, 11 represents a plate iron core wherein steel plates are laminated and the laimination thickness is approx. 5mm. having five pairs of windows. Five central legs of this iron core 11 are wound up respectively with conductors by the same turns, they are connected in series, and thus the secondary coil 12 of the current transformer 10 is formed. Besides, conductors are alternately passed through the five pairs of iron core windows in such a way that a cloth is sewn by a needle, and the primary coil 13 of the current transformer 10 is formed by winding up by desired turns. The current transformer 10 can be arranged between capacitor elements 17 with good space factor as shown in the figure by a method wherein the lamination thickness of the iron core 11 in the current transformer 10 is reduced, and longitudinal-transverse dimensions are made close to the dimension of the capacitor elements.

Description

【発明の詳細な説明】 本発明はコンデンサを保護する為にコンデンサに内蔵さ
れる変流器に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a current transformer built into a capacitor to protect the capacitor.

電力用コンデンサの単器容量は約１０　ＫＶＡから数万
ＫＶＡ　、定格電圧はｓ、ｓｙから１７ＫＶと容量、電
圧共に範囲が広い。それ等電力用コンデンサの保饅方式
も限流ヒユーズ方式や中性点電流検出、中性点電圧検出
、過電流検出、差電流検出、差電圧検出等多岐に亘って
いる。The unit capacity of power capacitors ranges from approximately 10 KVA to tens of thousands of KVA, and the rated voltage ranges widely from s, sy to 17 KV, both in capacity and voltage. There are a wide variety of protection methods for power capacitors, including current limiting fuse methods, neutral point current detection, neutral point voltage detection, overcurrent detection, differential current detection, and differential voltage detection.

高圧コンデンサの単器容量は１０〜Ｂ００ＫＶム　が標
準機種として用いられている。これ等高圧コンデンサ、
を限流ヒユーズで保−する場合、限流ヒユーズの動作特
性と高圧コンデンサの故障電流の関係から限流ヒユーズ
の適用基準を求めると高圧コンデンサの構造によっても
異るが、３．３１１１の高圧コンデンサでは１５０ＫＶ
Ａ。The unit capacity of high voltage capacitors used as standard models is 10 to B00KV. These high voltage capacitors,
When maintaining the current-limiting fuse with a current-limiting fuse, the application criteria for the current-limiting fuse can be found from the relationship between the operating characteristics of the current-limiting fuse and the failure current of the high-voltage capacitor. Then 150KV
A.

６．６ａでは３６０　ＫＶＡ　　迄はコンデンサの容量
に応じた定格電流の１本の限流ヒユーズを選定すること
が出来る。それを超過すると２本の限流ヒユーズを並列
に使用する必要があって不経済となる。そこで第１図に
示す如く高圧コンデンサ１．２の中性点０間に変流器１
を接続し高圧コンデンサ１．２の素子が絶縁破壊したと
きに中性点に流れる電流を検出して継電器４を動作させ
、その接点５により信号を系統の開閉器又は迩断器に送
って故障コンデンサを回路から切り一す方式が用いられ
ている。この方法も高圧コンデンサを１　、ｊＫ分割し
、かつ高圧の中性点端子を設けること、高圧変流器を設
けること等による機器のコストアップ、更に工事費のコ
ストアップ等の不利な点を有している。そこで変流器を
高圧コンデンサケースに内蔵することが考えられるが、
一般に用いられている変流器を内蔵する場合、変流器を
堆付ける為の架台が必要になり、更にコンデンサケース
内の占積率が悪くなって大形化し多量の絶縁油が必要に
なるので、この方法も不経済である。For 6.6a, up to 360 KVA, it is possible to select one current-limiting fuse with a rated current according to the capacity of the capacitor. If this is exceeded, it becomes necessary to use two current limiting fuses in parallel, which becomes uneconomical. Therefore, as shown in Figure 1, a current transformer 1 is connected between the neutral point 0 of the high voltage capacitor 1 and 2.
When the high-voltage capacitor 1.2 element breaks down, the relay 4 is activated by detecting the current flowing to the neutral point, and the contact 5 sends a signal to the system switch or disconnector to detect the failure. A method is used in which the capacitor is removed from the circuit. This method also has disadvantages such as an increase in equipment costs due to dividing the high voltage capacitor into 1, jK parts, providing a high voltage neutral point terminal, and installing a high voltage current transformer, as well as an increase in construction costs. are doing. Therefore, it is possible to incorporate the current transformer into the high-voltage capacitor case, but
When incorporating a commonly used current transformer, a stand is required to mount the current transformer, and the space factor inside the capacitor case becomes worse, making it larger and requiring a large amount of insulating oil. Therefore, this method is also uneconomical.

た変流器を提供することにある。The purpose of this invention is to provide a current transformer.

第２図は本発明の一実施例を示す変流器ＸＯの概念図で
ある。１１は鋼板を積層しその積層厚さが５１租度の板
状鉄心で、対の窓を５個有している。この鉄心１１の５
個の中央脚にはそれぞれ導線を同じ回数だけ巻回し、そ
れらを直列に接続して変流器１０の２次コイル１２を形
成する。また５個対の鉄心窓には導線を針で布を縫うよ
うに交互に通して所望する巻回数だけ巻回して変流器Ｉ
Ｏの１次コイル１１を形成する。第２図では１次コイル
１３は２回、２次コイル１２は３回巻回した例を示した
が、実際には必要なアンペアターンが得られる巻回数と
することは云うまでもない。又中央脚に巻回した導線を
並列に接続して２次コイルを形成してもよく、さらに鉄
心窓の数も５対に＠りず鉄心の積層厚さの関係で増減し
てもよい。１次コイル１３と鉄心１１間、１次コイル１
３と２次コイルＩ２，２次コイル１２と鉄心１１間は各
々必要な絶縁耐力を有するよう絶縁する。なお、鉄心１
１は図示していないが、２次コイル１２の１端と接続し
て同一電位とする。１次コイル１３には端子［Ｊ、Ｖ、
２次コイル１２には端子υ、Ｖが導出されている。FIG. 2 is a conceptual diagram of a current transformer XO showing an embodiment of the present invention. Reference numeral 11 is a plate-shaped iron core made of laminated steel plates with a laminated thickness of 51 degrees, and has five paired windows. This iron core 11-5
A conductive wire is wound the same number of times around each of the central legs, and these are connected in series to form the secondary coil 12 of the current transformer 10. In addition, the current transformer I
A primary coil 11 of O is formed. Although FIG. 2 shows an example in which the primary coil 13 is wound twice and the secondary coil 12 is wound three times, it goes without saying that in reality, the number of turns is determined to obtain the required ampere turns. Further, the secondary coil may be formed by connecting the conducting wires wound around the central leg in parallel, and the number of core windows may be increased or decreased to 5 pairs depending on the laminated thickness of the core. Between primary coil 13 and iron core 11, primary coil 1
3 and the secondary coil I2, and the secondary coil 12 and the iron core 11 are insulated to each have the required dielectric strength. In addition, iron core 1
Although reference numeral 1 is not shown, it is connected to one end of the secondary coil 12 to have the same potential. The primary coil 13 has terminals [J, V,
Terminals υ and V are led out to the secondary coil 12.

第３図は本発明による変流器１０を内蔵した高圧コンデ
ンサで、１４はケース、Ｚ５は高圧コンデンサの端子、
１６は変流器１０の２次端子である。第３図の［−１［
断面を第４図に示す。FIG. 3 shows a high-voltage capacitor incorporating a current transformer 10 according to the present invention, 14 is a case, Z5 is a terminal of the high-voltage capacitor,
16 is a secondary terminal of the current transformer 10. [-1[ in Figure 3
A cross section is shown in FIG.

１７はコンデンサ素子、１ｔｔ、ｘｗはコンデンサ素子
１７より導出された口出端子である。コンデンサ素子１
１を３ケづつ２組に分け１日出端子１９を１括接続して
中性点とし変流器ＩＯのＵ端子へ、他の組の日出端子１
９を１括して中性点とし変流器１０のＶ端子へ接続する
。コンデンサ素子１１の口出端子１８を２ケづつ並列に
接続してケース１４に設けた高圧コンデンサ端子１５へ
と接続する。変流器１０の２次端子ｕ、、、　ｖはケー
ス１４ＷＣ設けた端子１０へ接続する。第５図は第４図
に示した接続を電気回路にて示したものである。17 is a capacitor element, and 1tt and xw are output terminals led out from the capacitor element 17. Capacitor element 1
Divide 1 into 2 sets of 3 and connect the 1 sunrise terminals 19 together as a neutral point to the U terminal of the current transformer IO, and connect the sunrise terminals 1 of the other group to the U terminal of the current transformer IO.
9 collectively as a neutral point and connected to the V terminal of the current transformer 10. Output terminals 18 of capacitor elements 11 are connected in parallel, two at a time, to high-voltage capacitor terminals 15 provided on case 14. The secondary terminals u, . . . v of the current transformer 10 are connected to the terminal 10 provided in the case 14WC. FIG. 5 shows the connections shown in FIG. 4 in an electrical circuit.

変流器ｌＯの鉄心１１を第２図に示す如く積層厚さを小
さくし縦横の寸法をコンデンサ素子１１の寸法に近づけ
ることＫより変流器１０を第４図に示す如くコンデンサ
素子１１の間に占積率よ（容易に配設することが出来る
ので従来の中性点電流検出方式に比較して次の利点があ
る。As shown in FIG. 2, the iron core 11 of the current transformer 10 is made smaller in lamination thickness and the vertical and horizontal dimensions are brought closer to the dimensions of the capacitor element 11. Therefore, the current transformer 10 is placed between the capacitor elements 11 as shown in FIG. It has the following advantages over the conventional neutral point current detection method because it can be easily installed.

（イ）高圧コンデンサを２台に分割する必要がないので
単器容量を２倍にする事が出来る為。(a) There is no need to divide the high-voltage capacitor into two units, so the single unit capacity can be doubled.

大容歓化による経済的効果がある。There is an economic effect due to Dayong Huanization.

−）　据付面積が小さくなる。−) The installation area is smaller.

（ハ）　２台のコンデンサの並列接続や、変流器の接続
等の配線工事がなくなり工事費が安くなる。(c) Wiring work such as connecting two capacitors in parallel or connecting a current transformer is no longer required, reducing construction costs.

に）変流器を絶縁油中で用いる為、絶縁が容易になるの
で変流器自身が小形、軽敏、安価になる。(b) Since the current transformer is used in insulating oil, insulation becomes easier, making the current transformer itself smaller, more nimble, and less expensive.

このように本発明による変流器を高圧コンデンサに占積
率よく内蔵することにより、限流ヒユーズでは不可能な
容量範囲のコンデンサ素子破壊による過負荷を容易Ｋか
っ経済的に行う事が出来る。As described above, by incorporating the current transformer according to the present invention into a high voltage capacitor with a good space factor, it is possible to easily and economically handle overloads due to destruction of capacitor elements in a capacitance range that is impossible with current limiting fuses.

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

第１図は従来の中性点電流検出による高圧コンデンサの
回路図、第２図は本発明による変流器の概念図、第３図
は本発明による変流器を内蔵した高圧コンデンサを示す
斜ｆＭ　図、第４図は第３図のＩｆ−１Ｕ線断面図、第
５図は第４図の電気回路図である。 ｌＯ・・・変流器、１１・・・鉄心、１１・・・２次コ
イル、ＪＪ・・・１次コイル、１４…ケース、１５・・
・高圧上ンデンサ端子、１６・・・変流器２次端子。 １１・・・コンデンサ素子、ｆ８．Ｚ＃・・・口出端子
。 出願人代理人　弁理士　鈴　江　武　彦５ｌｌＩ Ｉ２ＩＩFigure 1 is a circuit diagram of a high voltage capacitor using conventional neutral point current detection, Figure 2 is a conceptual diagram of a current transformer according to the present invention, and Figure 3 is a diagram showing a high voltage capacitor incorporating a current transformer according to the present invention. The fM diagram and FIG. 4 are sectional views taken along line If-1U in FIG. 3, and FIG. 5 is an electric circuit diagram of FIG. 4. lO...Current transformer, 11...Iron core, 11...Secondary coil, JJ...Primary coil, 14...Case, 15...
・High voltage upper capacitor terminal, 16... Current transformer secondary terminal. 11... Capacitor element, f8. Z#...Exit terminal. Applicant's agent Patent attorney Takehiko Suzue 5llI I2II

Claims (1)

【特許請求の範囲】[Claims] 対の鉄心窓を複数個設けた細長い矩形状の珪素鋼板を積
層して板状鉄心を形成し、この板状鉄心の複数個の中央
脚に導線を巻回し、この導線を接続して２次コイルを形
成するとともに紡記複数個の対の鉄心窓に導線を交互に
通して１次コイルを形成した事を特徴とする変流器。A plate-shaped core is formed by laminating elongated rectangular silicon steel plates provided with a plurality of paired iron core windows, and a conductor is wound around the central legs of the plate-shaped core, and the conductor is connected to the secondary A current transformer characterized in that a coil is formed and a primary coil is formed by passing conductor wires alternately through a plurality of pairs of iron core windows.