JPS622887Y2 - - Google Patents

Description

【考案の詳細な説明】 本考案は、縮小形変電設備に備える接地機構付
断路器など接地装置を有する開閉装置に貫通形変
流器を付属し、該変流器の変成出力により地絡保
護出力を得る地絡継電器に係り、接地回路構成に
あるときの接地流電流で地絡継電器が誤動作する
のを防止した装置に関する。[Detailed description of the invention] This invention attaches a through-type current transformer to a switchgear equipped with a grounding device, such as a disconnector with a grounding mechanism, provided in a compact substation equipment, and provides ground fault protection by the transformed output of the current transformer. The present invention relates to a ground fault relay that obtains an output, and relates to a device that prevents the ground fault relay from malfunctioning due to ground current when it is in a ground circuit configuration.

この種の従来装置を第１図の結線図で説明す
る。同図において、回線Ａ，Ｂに接地装置を持つ
断路器１，２の線路に変流器３を付属し、該変流
器３の変成出力回路に地絡過電流継電器４さらに
は交流過電流継電器５を設け、回線Ａ，Ｂの地絡
保護出力を得る。例えば、回線Ｂから断路器２を
経た負荷側（図示しない）の地路発生時に、変流
器３の変成出力によつて地路過電流継電器４が回
線Ｂのしや断器を開路する保護出力を得る。ここ
で、例えば回線Ａが活線、回線Ｂが死線とし、断
路器１，２は図示状態すなわち断路器１は負荷側
に接続し、断路器２は保安等のために接地側に接
続した状態において、断路器１側の負荷に地路が
発生した場合すなわち等価的には断路地１が接地
側に接続された場合、回線Ａの地路検出とその保
護のほかに、地絡電流による回線Ａから回線Ｂへ
の誘導電圧による不平衡接地電流ｉが回線Ｂから
断路器２を経てその接地側に流れ込み、変流器３
に接続される地絡過電流継電器４が保護出力を出
すという誤動作をすることがある。そこで、従来
装置では、断路器１，２の接地回路にも変流器３
と同一特性の変流器６を設け、変流器６と変流器
３の変成出力を逆極性に並設することで接地回路
を通した接地電流には変流器３の出力を変流器６
の出力でキヤンセルするようにしている。 This type of conventional device will be explained with reference to the wiring diagram in FIG. In the figure, a current transformer 3 is attached to the lines of disconnectors 1 and 2 that have grounding devices on lines A and B, and a ground fault overcurrent relay 4 and an AC overcurrent relay are connected to the transformer output circuit of the current transformer 3. 5 to obtain ground fault protection output for lines A and B. For example, when a ground fault occurs on the load side (not shown) from line B through disconnector 2, the transform output of current transformer 3 causes the ground overcurrent relay 4 to output a protective output that opens the line B line breaker. get. Here, for example, line A is a live line, line B is a dead line, and disconnectors 1 and 2 are in the state shown, that is, disconnector 1 is connected to the load side, and disconnector 2 is connected to the ground side for security etc. In this case, if a ground fault occurs in the load on the disconnector 1 side, that is, equivalently, if the disconnect switch 1 is connected to the ground side, in addition to detecting and protecting the ground fault of line A, the circuit will be damaged due to ground fault current. Unbalanced ground current i due to the induced voltage from line A to line B flows from line B to the ground side of line B via disconnector 2, and current transformer 3
The ground fault overcurrent relay 4 connected to the ground fault overcurrent relay 4 may malfunction by outputting a protective output. Therefore, in the conventional device, the current transformer 3 is also connected to the ground circuit of the disconnectors 1 and 2.
By installing a current transformer 6 with the same characteristics as the current transformer 6 and arranging the transform outputs of the current transformer 6 and current transformer 3 in parallel with opposite polarities, the output of the current transformer 3 is transformed for the ground current passing through the ground circuit. vessel 6
I am trying to cancel it with the output of .

このため、従来装置は変流器３のほかに補償用
変流器６を必要とし、誤動作防止装置としては高
価になるし、縮小形変電設備等では補償用変流器
の取付スペースの確保の問題もあつた。 For this reason, the conventional device requires a compensating current transformer 6 in addition to the current transformer 3, which makes it expensive as a malfunction prevention device, and it is difficult to secure installation space for the compensating current transformer in compact substation equipment. There were also problems.

本考案は貫通形変流器のコイルを貫通した導体
を介して接地回路を構成することにより、補償用
変流器と同等の機能を有しかつ低価格、小型にで
きる誤動作防止装置を提供することを目的とす
る。 The present invention provides a malfunction prevention device that has the same function as a compensation current transformer and can be made low-cost and compact by configuring a grounding circuit through a conductor that passes through the coil of a feed-through current transformer. The purpose is to

第２図は本考案の一実施例を示す要部構成図で
ある。１０は第１図に示す断路器１，２等を等価
的に示す開閉器であり、ハウジング１１内に収納
され、接地端子１０Ａはブツシング１２を介して
ハウジング１１外に引出される。開閉器１０の電
源側端子１０Ｂは碍管１３内を貫通してハウジン
グ１１外に引出され、変流器取付金具１４に連設
するパイプ１５内のケーブル１６で引出される。
変流器取付金具１４にはケーブル１６を変成用貫
通導体として鉄心１７，コイル１８が巻回される
ほかに、コイル１８を貫通した導体１９が並設さ
れる。この導体１９はコイル１８、鉄心１７と共
にモールド部材２０で一体に埋込まれ、一端はブ
ツシング１２を介して接地端子１０Ａに導体接続
され、他端は接地される。 FIG. 2 is a block diagram of main parts showing an embodiment of the present invention. Reference numeral 10 designates a switch equivalent to the disconnectors 1, 2, etc. shown in FIG. The power supply side terminal 10B of the switch 10 passes through the insulator tube 13 and is drawn out of the housing 11, and is drawn out by a cable 16 in a pipe 15 connected to the current transformer mounting bracket 14.
In addition to winding an iron core 17 and a coil 18 around the current transformer mounting bracket 14 using a cable 16 as a through conductor for transformation, a conductor 19 passing through the coil 18 is arranged in parallel. This conductor 19 is embedded together with the coil 18 and the iron core 17 in a mold member 20, one end of which is conductively connected to the ground terminal 10A via the bushing 12, and the other end of which is grounded.

このように変流器コイル１８を貫通する導体１
９を開閉器１０の接地回路導体に直列接続して該
接地回路を構成することにより、開閉器１０の接
地状態でケーブル１６に誘導される電圧で接地電
流が流れるもケーブル１６の電流と導体１９の電
流とが相殺し、コイル１８に変成出力が現われ
ず、地絡継電器の誤動作を防止できる。そして、
誤動作防止装置としては変流器コイルに貫通させ
る接地用導体を増設することで済み、補償用変流
器を必要としないしその取付スペースも不要とな
る。 The conductor 1 passing through the current transformer coil 18 in this way
By connecting 9 in series to the grounding circuit conductor of the switch 10 to form the grounding circuit, even though a grounding current flows due to the voltage induced in the cable 16 when the switch 10 is grounded, the current in the cable 16 and the conductor 19 The currents cancel each other out, so that no transform output appears in the coil 18, and malfunction of the ground fault relay can be prevented. and,
As a malfunction prevention device, it is sufficient to add a grounding conductor that passes through the current transformer coil, and there is no need for a compensating current transformer and no space for its installation.

第３図は本考案の他の実施例を示す。同図が第
２図と異なる部分は、導体１９の代りに取付金具
１４そのものを接地回路導体として使用する点に
ある。この場合、取付金具１４は導体とされるた
め、ハウジング１１への取付けに電気絶縁が施さ
れる。また、取付金具１４のフランジ部には接地
回路導体としての接続端子板１４Ａ，１４Ｂを具
える。 FIG. 3 shows another embodiment of the invention. This figure differs from FIG. 2 in that the mounting bracket 14 itself is used as a grounding circuit conductor instead of the conductor 19. In this case, since the mounting bracket 14 is a conductor, electrical insulation is provided when it is attached to the housing 11. Further, the flange portion of the mounting bracket 14 is provided with connection terminal plates 14A and 14B as grounding circuit conductors.

本実施例においても第２図のものと同様の作用
効果を有する。 This embodiment also has the same effect as the one shown in FIG.

以上のとおり、本考案による誤動作防止装置
は、補償用変流器を特別に設けることなく、接地
装置での接地電流で地絡継電器が動作するのを防
止できる効果がある。 As described above, the malfunction prevention device according to the present invention has the effect of preventing the ground fault relay from operating due to the ground current in the grounding device, without the need for a special current transformer for compensation.

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

第１図は従来の誤動作防止装置を説明するため
の結線図、第２図は本考案の一実施例を示す要部
構成図、第３図は本考案の他の実施例を示す要部
構成図である。 １０……接地装置を有する開閉器、１１……ハ
ウジング、１２……ブツシング、１３……碍管、
１４……取付金具、１７……鉄心、１８……変流
器コイル、１９……導体、２０……モールド部
材、１４Ａ，１４Ｂ……接続導体。 Fig. 1 is a wiring diagram for explaining a conventional malfunction prevention device, Fig. 2 is a main part configuration diagram showing one embodiment of the present invention, and Fig. 3 is a main part structure showing another embodiment of the present invention. It is a diagram. 10... Switch having a grounding device, 11... Housing, 12... Bushing, 13... Insulator pipe,
14... Mounting bracket, 17... Iron core, 18... Current transformer coil, 19... Conductor, 20... Mold member, 14A, 14B... Connection conductor.

Claims (1)

【実用新案登録請求の範囲】 (1) 接地装置を有する開閉装置に貫通形変流器を
付属し、該変流器の変成出力により地絡保護出
力を得る地路継電器において、上記接地装置の
接地回路導体は上記変流器コイルを貫通する導
体を介して接地する構造を特徴とする地絡継電
器の誤動作防止装置。 (2) 上記変流器はそのコイルを貫通した導体を備
え、該導体を上記接地回路導体に直列接続した
実用新案登録請求の範囲第１項記載の地絡継電
器の誤動作防止装置。 (3) 上記変流器はそのコイルと該コイルを貫通さ
せる変成用導体との間に具える取付金具を上記
接地回路導体に直列接続した実用新案登録請求
の範囲第１項記載の地絡継電器の誤動作防止装
置。[Scope of Claim for Utility Model Registration] (1) In a ground relay in which a feed-through current transformer is attached to a switchgear having a grounding device and a ground fault protection output is obtained by the transformed output of the current transformer, A malfunction prevention device for a ground fault relay, characterized in that the ground circuit conductor is grounded via a conductor that passes through the current transformer coil. (2) The malfunction prevention device for a ground fault relay according to claim 1, wherein the current transformer has a conductor passing through its coil, and the conductor is connected in series to the ground circuit conductor. (3) The earth fault relay according to claim 1 of the utility model registration claim, wherein the current transformer has a mounting bracket provided between the coil and a transformation conductor passing through the coil and connected in series to the ground circuit conductor. malfunction prevention device.