JP2550815B2 - Gas breaker - Google Patents

Gas breaker

Info

Publication number
JP2550815B2
JP2550815B2 JP3304487A JP30448791A JP2550815B2 JP 2550815 B2 JP2550815 B2 JP 2550815B2 JP 3304487 A JP3304487 A JP 3304487A JP 30448791 A JP30448791 A JP 30448791A JP 2550815 B2 JP2550815 B2 JP 2550815B2
Authority
JP
Japan
Prior art keywords
inclined surface
nozzle
divergent portion
downstream side
gas
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
Application number
JP3304487A
Other languages
Japanese (ja)
Other versions
JPH0574286A (en
Inventor
奎将 遠藤
茂夫 小林
芳夫 吉岡
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 JP3304487A priority Critical patent/JP2550815B2/en
Publication of JPH0574286A publication Critical patent/JPH0574286A/en
Application granted granted Critical
Publication of JP2550815B2 publication Critical patent/JP2550815B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/7015—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts
    • H01H33/7023—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts characterised by an insulating tubular gas flow enhancing nozzle
    • H01H33/703—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts characterised by an insulating tubular gas flow enhancing nozzle having special gas flow directing elements, e.g. grooves, extensions

Landscapes

  • Circuit Breakers (AREA)

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、ガス遮断器の遮断部構
造に係わるもので、特に進み小電流遮断性能を著しく向
上させることのできるノズル構造を有するガスしゃ断器
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a breaker structure of a gas circuit breaker, and more particularly to a gas breaker having a nozzle structure capable of significantly improving the advanced small current breaking performance.

【０００２】[0002]

【従来の技術】ガス遮断器の遮断責務において、高電圧
化を図るとき厳しくなってくるものに進み電流遮断責務
がある。これは、よく知られているように遮断器電極間
の開極距離がまだ十分大でない０.５ サイクロ付近で通
常の２倍の回復電圧が印加されるためである。2. Description of the Related Art Regarding the obstruction duty of a gas circuit breaker, there is an obligatory duty to interrupt a current, which becomes more severe when a high voltage is attempted. This is because, as is well known, a recovery voltage twice as high as usual is applied in the vicinity of 0.5 cyclone where the contact opening distance between the circuit breaker electrodes is not yet sufficiently large.

【０００３】固定子と可動子との間に生じたアークを、
乱流により冷却消弧するものとして、例えば実開昭54−
42979 号公報に記載されたものがある。この公知例は絶
縁ノズルにおけるスロートの下流側の末広部に、周方向
に不連続な島状の突起を設け、この突起の下流側に気流
の乱れを生じさせ、これによってアークを冷却消弧させ
るものである。The arc generated between the stator and the mover is
For example, cooling and extinguishing by turbulent flow is described in, for example,
Some are described in Japanese Patent No. 42979. In this known example, an island-shaped projection that is discontinuous in the circumferential direction is provided in the divergent portion on the downstream side of the throat in the insulating nozzle, and the turbulence of the air flow is generated on the downstream side of this projection, thereby cooling and extinguishing the arc. It is a thing.

【０００４】[0004]

【発明が解決しようとする課題】上記従来技術において
は、絶縁ノズルの末広部に設けた突起を島状に構成して
いるため、完全な軸対称に形成されていないと共に、非
対称とすることによって、渦流発生，乱流発生を生ぜし
める構造を提供するものであり、突起による固定子先端
周辺の圧力低下現象や、その防止による絶縁耐力の低下
現象や、さらには進み電流遮断性能の向上について何等
配慮されておらず、アークの消弧性が十分でないという
問題点があった。In the above-mentioned prior art, since the projections provided in the divergent portion of the insulating nozzle are formed in an island shape, they are not formed in perfect axial symmetry and are made asymmetric. It provides a structure that causes the generation of eddies and turbulence, and the phenomenon of pressure drop around the tip of the stator due to protrusions, the phenomenon of dielectric strength reduction due to its prevention, and the improvement of forward current cutoff performance. There was a problem that the arc extinguishing property was not sufficient due to lack of consideration.

【０００５】本発明は上述の事柄にもとづいてなされた
もので、開極途上の極間過渡絶縁耐力を向上し得るガス
しゃ断器を提供することを目的とする。The present invention has been made based on the above-mentioned matters, and an object of the present invention is to provide a gas circuit breaker capable of improving the inter-electrode transient dielectric strength during the opening process.

【０００６】[0006]

【課題を解決するための手段】本発明は上記の目的を達
成するために、圧縮ガスを、スロートとその下流側に設
けた末広部とを有するノズルで導いてアークを発生する
接触子に吹きつけて消弧する方式のしゃ断器において、
前記ノズルのスロートより下流側の末広部に、下流側に
向かって流路を先細りとする第１の傾斜面と、この第１
の傾斜面に接続し、下流側に向って流路を先広がりとす
る第２の傾斜面とを有する環状の突出部を前記末広部の
内面よりノズルの中心軸方向に突出するように設け、前
記突出部における第２の傾斜面のノズル軸線方向の長さ
を、第１の傾斜面のそれと同等かそれ以上にしたもので
ある。In order to achieve the above-mentioned object, the present invention blows a compressed gas onto a contact which generates an arc by guiding a compressed gas with a nozzle having a throat and a divergent portion provided downstream thereof. In a circuit breaker that turns on and extinguishes,
A first inclined surface having a tapered flow passage toward the downstream side at a divergent portion on the downstream side of the throat of the nozzle;
And an annular protrusion having a second inclined surface that spreads the flow path forward toward the downstream side is provided so as to protrude in the central axis direction of the nozzle from the inner surface of the divergent portion, The length of the second inclined surface of the protrusion in the nozzle axis direction is equal to or longer than that of the first inclined surface.

【０００７】[0007]

【作用】上述のような構成、すなわち、末広部に設ける
突出部の第２の傾斜面のノズル軸線方向の長さを、第１
の傾斜面のそれと同等かそれ以上にすることにより、ス
ロートを通り末広部に流入したガスは膨張し、突出部の
第１の傾斜面にぶつかり、流れの方向を固定子側へ折り
曲げられ、その後、第２の傾斜面に沿って流れる。その
結果、開離状態にある接触子の近傍に流れの渦を発生さ
せることがなくガスの固定子への吹き付けが有効に行な
われ、電界の強い固定子の先端のガス圧力の低下が防止
されるため、開極途中における極間過渡絶縁耐力が向上
し、ガス遮断器にとって厳しい条件の高い再起電圧の加
わる進み小電流しゃ断性能が著しく向上する。With the above-described structure, that is, the length of the second inclined surface of the protrusion provided in the divergent portion in the nozzle axis direction is set to the first
By making it equal to or more than that of the inclined surface of, the gas flowing into the divergent part through the throat expands, hits the first inclined surface of the protruding part, and the flow direction is bent to the stator side, then , Along the second inclined surface. As a result, the gas is effectively blown to the stator without generating flow vortices in the vicinity of the contact in the separated state, and the drop in gas pressure at the tip of the stator with a strong electric field is prevented. Therefore, the inter-electrode transient dielectric strength in the middle of the opening of the contacts is improved, and the advanced small current interruption performance to which the high recurrent voltage, which is a severe condition for the gas circuit breaker, is significantly improved.

【０００８】[0008]

【実施例】以下、本発明の実施例を図面を参照して説明
する。Embodiments of the present invention will be described below with reference to the drawings.

【０００９】図１は本発明の一実施例を示すもので、こ
の図において、１は固定子、２は固定子１に接離する可
動子、３は可動子２とともに移動するシリンダ、４は圧
縮ガスを生起するバッファ室、５はシリンダ３に固定さ
れた絶縁物製のノズルである。このノズル５はその内部
に固定子１が出入りするスロート５０と、このスロート
５０の下流側に設けた末広部５１と、この末広部５１に
設けた突出部５２とを備えている。この突出部５２は下
流側に向かって流路を先細りとする第１の傾斜面５２ａ
と流路を先広がりとする第２の傾斜面５２ｂとを備え、
末広部５１の面からノズルの中心軸方向に突出してい
る。この突出部５２における第１の傾斜面５２ａのノズ
ル軸線方向の長さ、すなわち、第１の傾斜面５２ａと第
２の傾斜面５２ｂとの交点である頂点Ｔと、第１の傾斜
面５２ａと末広部５１との交点Ｓとのノズル軸線方向の
長さｌ1 とし、第２の傾斜面５２ｂが、ノズルスロート
付近の末広がりの傾斜面の延長線と交差するまでの第２
の傾斜面のノズル軸線方向の長さ、すなわち突出部５２
の頂点Ｔと第２の傾斜面５２ｂの延長線Ｌ1 が末広部５
１の延長線Ｌ2 に交差する点Ｕとのノズル軸線方向の長
さをｌ2 とすると、ｌ2 はｌ1 と同等かそれより大きく
構成されている。このように第１の傾斜面５２ａと第２
の傾斜面５２ｂとのノズル軸線方向の長さの関係を規定
した理由は、スロート５０から末広部５１の下流側に向
かって流出する圧縮されたガスが、第１の傾斜面５２ａ
から突出部５２の頂点Ｔを通って、第２の傾斜面５２ｂ
に流出する際、ガスが第２の傾斜面５２ｂからはく離し
て渦を発生させないようにするものである。FIG. 1 shows an embodiment of the present invention. In this figure, 1 is a stator, 2 is a mover that contacts and separates from the stator 1, 3 is a cylinder that moves with the mover 2, and 4 is a cylinder. The buffer chambers 5 for generating compressed gas are nozzles made of an insulating material and fixed to the cylinder 3. The nozzle 5 is provided with a throat 50 through which the stator 1 moves in and out, a divergent portion 51 provided on the downstream side of the throat 50, and a protruding portion 52 provided in the divergent portion 51. The protruding portion 52 has a first inclined surface 52a that tapers the flow path toward the downstream side.
And a second inclined surface 52b having a channel that widens,
It projects from the surface of the divergent portion 51 in the direction of the central axis of the nozzle. The length of the first inclined surface 52a of the protruding portion 52 in the nozzle axis direction, that is, the vertex T that is the intersection of the first inclined surface 52a and the second inclined surface 52b, and the first inclined surface 52a. The length l 1 in the nozzle axis direction with the intersection S with the divergent portion 51 is set, and the second inclined surface 52b is the nozzle throat.
2nd until it intersects with the extension of the sloping slope near the end
Of the inclined surface of the nozzle in the direction of the nozzle axis , that is, the protrusion 52
And the extension line L 1 of the second inclined surface 52b from the apex T of the
When the nozzle axis direction lengths of the U point of intersection to the first extension line L 2 and l 2, l 2 is configured larger than or equal to l 1. Thus, the first inclined surface 52a and the second inclined surface 52a
The reason for defining the relationship between the inclined surface 52b and the length in the nozzle axial direction is that the compressed gas flowing out from the throat 50 toward the downstream side of the divergent portion 51 is the first inclined surface 52a.
Through the apex T of the protrusion 52 from the second inclined surface 52b
When the gas flows out, the gas is separated from the second inclined surface 52b so as not to generate a vortex.

【００１０】この実施例においては、ノズルの先端側の
強度を高めるために、末広部５１における第２の傾斜面
５２ｂ以降の下流側内面に、補強部５２ｃを設けてい
る。強度上、十分に耐え得る場合には、この補強部５２
ｃを取除いてもよい。In this embodiment, in order to increase the strength on the tip side of the nozzle, a reinforcing portion 52c is provided on the downstream inner surface of the divergent portion 51 after the second inclined surface 52b. When it is possible to sufficiently withstand the strength, this reinforcing portion 52
You may remove c.

【００１１】次に、上述した本発明の一実施例の動作を
説明する。Next, the operation of the above-described embodiment of the present invention will be described.

【００１２】しゃ断器が開極を始めると、シリンダ３内
のパッファ室４のガスが圧縮され、ノズル５の内部を高
速で流れ始める。圧縮されたガスは、スロート５０を通
過したのち、末広部５１によって膨張しながら、突出部
５２の第１の傾斜面５２ａにぶつかり、その流れの向き
を固定子１に折り曲げられる。その後、突出部５２の第
２の傾斜面５２ｂに沿って軸対象に矢印Ａにように流れ
る。そして、前述したように、突出部５２における第１
の傾斜面５２ａと第２の傾斜面５２ｂとのノズル軸線方
向の長さｌ1，ｌ2との関係が、ｌ1／ｌ2≧１の如く設定
されているので、ガスの固定子１への吹き付けが有効に
行われ、電界の強い固定子１の先端のガス圧力の低下を
防止することができる。この点について、図２を用いて
更に詳しく述べると、図２はガス圧力と突出部の傾斜面
の長さ比（ｌ2／ｌ1）との関係を示すもので、この図中
の点線Ｂは充気圧力を、また曲線Ｃは固定子先端のガス
圧力を示す。この図から明らかなように、突出部５２の
第１と第２の傾斜面の長さ比（ｌ2／ｌ1）の値が１より
小さな条件では、気流の流れの方向がノズルの壁面の曲
がりに追従できないので、第２の傾斜面に渦流が発生す
る。その結果、電界の強い固定子先端部のガス圧力は変
動が激しく、その値も低下する。これに対し、本発明に
よれば、ガスの渦発生によるガス圧力の低下が防止され
るため、開極途中における極間過渡絶縁耐力は、固定子
先端部のガス圧力低下による絶縁耐力の低下が無く順調
に向上して高くなる。したがって、ガス遮断器にとって
厳しい条件の高い再起電圧の加わる進み小電流しゃ断性
能が著しく向上する。When the circuit breaker starts to open, the gas in the puffer chamber 4 in the cylinder 3 is compressed and starts flowing at high speed inside the nozzle 5. The compressed gas, after passing through the throat 50, collides with the first inclined surface 52a of the protrusion 52 while expanding by the divergent portion 51, and the flow direction thereof is bent to the stator 1. After that, it flows along the second inclined surface 52b of the protruding portion 52 to the axis as shown by the arrow A. Then, as described above, the first portion of the protrusion 52 is formed.
The relationship between the inclined surfaces 52a and 52b of the second inclined surface 52b and the lengths l 1 and l 2 in the nozzle axial direction is set as l 1 / l 2 ≧ 1. Is effectively sprayed, and the gas pressure at the tip of the stator 1 having a strong electric field can be prevented from lowering. This point will be described in more detail with reference to FIG. 2. FIG. 2 shows the relationship between the gas pressure and the length ratio (l 2 / l 1 ) of the inclined surface of the protruding portion, which is indicated by the dotted line B in this figure. Represents the charging pressure, and curve C represents the gas pressure at the tip of the stator. As is clear from this figure, under the condition that the value of the length ratio (l 2 / l 1 ) of the first and second inclined surfaces of the protrusion 52 is smaller than 1, the direction of the air flow is the same as that of the wall surface of the nozzle. Song
Since it cannot follow the beam, a vortex is generated on the second inclined surface. As a result, the gas pressure at the tip of the stator, where the electric field is strong, fluctuates drastically and its value also drops. On the other hand, according to the present invention, the decrease in gas pressure due to the generation of gas vortex is prevented, and therefore the inter-electrode transient dielectric strength during the opening of the electrode is reduced due to the decrease in gas pressure at the tip of the stator. Without any improvement, it will increase steadily. Therefore, the advanced small current interruption performance to which the re-electromotive force is applied, which is a severe condition for the gas circuit breaker, is significantly improved.

【００１３】なお、図１に示す実施例において、第２の
傾斜面５２ｂのノズル軸線方向の長さｌ2 を大きくした
場合、第２の傾斜面は、突出部５２の頂点Ｔとノズル先
端における末広部５１の下流端とを結ぶ面に形成され
る。この場合にも上述の実施例と同様な効果が得られ
る。In the embodiment shown in FIG. 1, when the length l 2 of the second inclined surface 52b in the nozzle axial direction is increased, the second inclined surface is at the apex T of the protrusion 52 and the nozzle tip. It is formed on a surface connecting to the downstream end of the divergent portion 51. Also in this case, the same effect as that of the above-described embodiment can be obtained.

【００１４】図３は本発明の他の実施例を示すもので、
この実施例は図１に示す実施例の構成を加えて、突出部
５２にその上流側と下流側とを連結する通路６を設けた
ものである。FIG. 3 shows another embodiment of the present invention.
In this embodiment, in addition to the structure of the embodiment shown in FIG. 1, the projecting portion 52 is provided with a passage 6 connecting the upstream side and the downstream side thereof.

【００１５】このように構成しても、図１に示す実施例
と同様な効果が達成される。Even with this structure, the same effect as that of the embodiment shown in FIG. 1 can be achieved.

【００１６】図４は本発明のさらに他の実施例を示すも
ので、この実施例はノズル５の内部に形成されるスロー
ト５０，末広部５１および突出部５２との接続角部をな
めらかな曲線で構成したものである。このように構成し
ても同様な効果が得られる。さらに、突出部５２から末
広部の最下流端に至る部分をなだらかな曲線で構成して
もよい。FIG. 4 shows still another embodiment of the present invention. In this embodiment, the connecting corners of the throat 50, the divergent portion 51 and the protruding portion 52 formed inside the nozzle 5 are curved smoothly. It is composed of. Even with this configuration, the same effect can be obtained. Further, the portion from the protruding portion 52 to the most downstream end of the divergent portion may be formed by a gentle curve.

【００１７】なお、上述の実施例は突出部を１段とした
場合であるが、多段に構成することもできる。In the above embodiment, the projecting portion has one step, but it may have a multi-step configuration.

【００１８】[0018]

【発明の効果】本発明によれば、ノズルの末広部の内面
に設けた第１の傾斜面と第２の傾斜面とからなり、第２
の傾斜面のノズル軸線方向の長さを第１の傾斜面のそれ
と同等面のそれと同等かそれ以上にした環状の突出部に
より、開離状態にある接触子の近傍に流れの渦を発生さ
せることがなく、ガスの固定子への吹き付けが有効に行
なわれ、電界の強い固定子の先端のガス圧力の低下が防
止されるため、開極途中における極間過渡絶縁耐力が向
上し、ガス遮断器にとって厳しい条件の高い再起電圧の
加わる進み小電流しゃ断性能が著しく向上する。According to the present invention, the first inclined surface and the second inclined surface provided on the inner surface of the divergent portion of the nozzle are provided.
A vortex of the flow is generated in the vicinity of the contact in the separated state by the annular protrusion whose length in the nozzle axis direction of the inclined surface is equal to or longer than that of the first inclined surface. Gas is effectively blown to the stator, and the drop in gas pressure at the tip of the stator with a strong electric field is prevented. The advanced small current interruption performance to which a high re-electromotive force is applied, which is a severe condition for the equipment, is significantly improved.

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

【図１】本発明のガスしゃ断器の一実施例を示す断面図
である。FIG. 1 is a sectional view showing an embodiment of a gas circuit breaker of the present invention.

【図２】本発明の動作説明のための特性図である。FIG. 2 is a characteristic diagram for explaining the operation of the present invention.

【図３】本発明のガスしゃ断器の他の実施例を示す断面
図である。FIG. 3 is a sectional view showing another embodiment of the gas circuit breaker of the present invention.

【図４】本発明のガスしゃ断器のさらに他の実施例を示
す断面図である。FIG. 4 is a sectional view showing still another embodiment of the gas circuit breaker of the present invention.

【符号の説明】[Explanation of symbols]

１…固定子、２…可動子、３…シリンダ、４…パッファ
室、５…ノズル、５０…スロート、５１…末広部、５２
…突出部、５２ａ…第１の傾斜面、５２ｂ…第２の傾斜
面。1 ... Stator, 2 ... Mover, 3 ... Cylinder, 4 ... Puffer chamber, 5 ... Nozzle, 50 ... Throat, 51 ...
... Projection part, 52a ... 1st inclined surface, 52b ... 2nd inclined surface.

───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭48−24260（ＪＰ，Ａ) 特開 昭54−42979（ＪＰ，Ａ) 実開 昭55−87638（ＪＰ，Ｕ) 特公 昭50−40788（ＪＰ，Ｂ２) ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-48-24260 (JP, A) JP-A-54-42979 (JP, A) Actual development-Sho-55-87638 (JP, U) JP-B-50- 40788 (JP, B2)

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】圧縮ガスを、スロートとその下流側に設け
た末広部とを有するノズルで導いてアークを発生する接
触子に吹きつけて消弧する方式のしゃ断器において、前
記ノズルのスロートより下流側の末広部に、下流側に向
かって流路を先細りとする第１の傾斜面と、この第１の
傾斜面に接続し、下流側に向かって流路を先広がりとす
る第２の傾斜面とを有する環状の突出部を前記末広部の
内面よりノズルの中心軸方向に突出するようにノズルの
周方向に連続して設け、第２の傾斜面と前記末広部の傾
斜面を延長した面とが交わる部分から前記突出部までの
間におけるノズルの軸線方向における長さを、第１の傾
斜面のそれと同等かそれ以上にしたことを特徴とするガ
スしゃ断器。1. A circuit breaker in which compressed gas is guided by a nozzle having a throat and a divergent portion provided on the downstream side thereof and is blown to a contact which generates an arc to extinguish the arc, In the divergent portion on the downstream side, a first inclined surface that tapers the flow path toward the downstream side, and a second inclined surface that is connected to this first inclined surface and that widens the flow path toward the downstream side An annular protrusion having an inclined surface is formed so as to protrude from the inner surface of the divergent portion in the direction of the central axis of the nozzle.
Provided continuously in the circumferential direction, the second inclined surface and the divergent portion are inclined.
From the part where the sloped surface intersects with the protruding part
A gas circuit breaker characterized in that the length of the nozzle in the axial direction between the gaps is equal to or longer than that of the first inclined surface.
JP3304487A 1991-11-20 1991-11-20 Gas breaker Expired - Lifetime JP2550815B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3304487A JP2550815B2 (en) 1991-11-20 1991-11-20 Gas breaker

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3304487A JP2550815B2 (en) 1991-11-20 1991-11-20 Gas breaker

Publications (2)

Publication Number Publication Date
JPH0574286A JPH0574286A (en) 1993-03-26
JP2550815B2 true JP2550815B2 (en) 1996-11-06

Family

ID=17933627

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3304487A Expired - Lifetime JP2550815B2 (en) 1991-11-20 1991-11-20 Gas breaker

Country Status (1)

Country Link
JP (1) JP2550815B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3503151B1 (en) * 2017-12-20 2022-04-13 Hitachi Energy Switzerland AG Circuit breaker and method of performing a current breaking operation

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1463295A (en) * 1973-04-12 1977-02-02 British Petroleum Co Fermentation processes for converting methane into proteina ceous material
JPS5442979U (en) * 1977-08-29 1979-03-23
JPS5587638U (en) * 1978-12-13 1980-06-17

Also Published As

Publication number Publication date
JPH0574286A (en) 1993-03-26

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