JPH09140061A - Power supply - Google Patents
Power supplyInfo
- Publication number
- JPH09140061A JPH09140061A JP7322323A JP32232395A JPH09140061A JP H09140061 A JPH09140061 A JP H09140061A JP 7322323 A JP7322323 A JP 7322323A JP 32232395 A JP32232395 A JP 32232395A JP H09140061 A JPH09140061 A JP H09140061A
- Authority
- JP
- Japan
- Prior art keywords
- power supply
- power
- transformer
- secondary side
- phase
- 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.)
- Withdrawn
Links
- 230000002265 prevention Effects 0.000 claims description 9
- 230000003449 preventive effect Effects 0.000 abstract 2
- 230000002950 deficient Effects 0.000 abstract 1
- 238000012544 monitoring process Methods 0.000 description 8
- 230000000903 blocking effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 2
- 238000012806 monitoring device Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
Landscapes
- Supply And Distribution Of Alternating Current (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は電源供給装置に関
し、例えば、マンションなどの集合住宅における供給用
変圧器室のような電力会社の借室を対象として、その内
部の環境状態や各種設備の状況を遠方にある電力会社の
監視局から自動的に点検、監視する借室遠方監視システ
ムにおいて、監視用の各種装置または機器（以下、必要
に応じて被給電装置という）に商用周波電源を安定して
供給するための電源供給装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device, for example, a rental room of a power company such as a supply transformer room in an apartment complex such as a condominium, and its internal environmental condition and various equipment conditions. In the distant room distant monitoring system that automatically inspects and monitors the electricity from a distant power company's monitoring station, stabilize the commercial frequency power supply to various devices or equipment for monitoring (hereinafter referred to as power-supplied devices as necessary) The present invention relates to a power supply device for supplying electric power.
【０００２】図３は、この種の電源供給装置の従来技術
を示している。図において、Ｌは三相三線式の配電線、
Ｄはディスコン、Ｔａ，Ｔｂ，Ｔｃは集合住宅内の借室
に設置される単相三線式の変圧器であり、そのうちの１
台、例えばＴａの二次側片相には、ブレーカＢを介して
コンセントＣが接続されている。FIG. 3 shows the prior art of this type of power supply device. In the figure, L is a three-phase three-wire type distribution line,
D is a disc computer, and Ta, Tb, and Tc are single-phase, three-wire type transformers installed in a rented room in an apartment house.
An outlet C is connected via a breaker B to the secondary side single phase of the table, for example, Ta.
【０００３】図示されていないが、借室内には火災セン
サ、煙センサ、室温センサ、変圧器油温度センサ、負荷
電流計測センサ、負荷電圧計測センサ等の各種センサが
設けられており、これらのセンサによる検出データがパ
ソコン等からなる借室監視装置により収集、処理され、
遠方の監視局へ伝送されるようになっている。ここで、
各種センサや借室監視装置等の被給電装置には、前記コ
ンセントＣから商用電源が供給されている。Although not shown, various sensors such as a fire sensor, a smoke sensor, a room temperature sensor, a transformer oil temperature sensor, a load current measuring sensor, a load voltage measuring sensor, etc. are provided in the rented room. The data detected by is collected and processed by a rental room monitoring device such as a personal computer,
It is transmitted to a remote monitoring station. here,
Commercial power is supplied from the outlet C to power-supplied devices such as various sensors and rental room monitoring devices.
【０００４】[0004]
【発明が解決しようとする課題】上記従来技術では、配
電線Ｌの一相、言い換えれば１台の変圧器Ｔａの二次側
に接続されたコンセントＣから電源を供給しているた
め、上記配電線Ｌの一相や変圧器Ｔａに供給故障が発生
した場合には、被給電装置への電源供給が不可能になっ
てしまう。また、コンセントＣによる接続では信頼性の
高い接続が確保できないという問題がある。更に、コン
セントＣが変圧器Ｔａの二次側にブレーカＢを介して直
接接続されるので、配電線Ｌに侵入する雷サージや高圧
（６．６ｋＶ系）機器（ディスコンＤや多回路開閉器な
ど）の開閉サージ及び他系統から侵入する高周波ノイズ
が、コンセントＣを介して被給電装置に悪影響を与えや
すい。In the above prior art, since the power is supplied from one phase of the distribution line L, in other words, from the outlet C connected to the secondary side of one transformer Ta, the above distribution is performed. When a supply failure occurs in one phase of the electric wire L or the transformer Ta, the power supply to the power-supplied device becomes impossible. Further, the connection by the outlet C has a problem that a highly reliable connection cannot be secured. Furthermore, since the outlet C is directly connected to the secondary side of the transformer Ta via the breaker B, lightning surges entering the distribution line L and high-voltage (6.6 kV system) devices (disconnect D, multi-circuit switch, etc.) ) The switching surge and the high frequency noise that enters from other systems are likely to adversely affect the power-supplied device via the outlet C.
【０００５】特に、通信機能・計測機能を持つ被給電装
置にはサージやノイズに弱い電子部品が多く使われてい
るため、個々に対策を施す場合には被給電装置のコスト
が上昇し、ひいては監視システム全体がコスト高になる
という問題がある。In particular, since power-supplied devices having a communication function and a measurement function often use electronic parts that are weak against surges and noises, the cost of the power-supplied devices increases if individual countermeasures are taken, and eventually There is a problem that the cost of the entire monitoring system becomes high.
【０００６】本発明は上記課題を解決するためになされ
たもので、被給電装置に対して常に安定して商用電源を
供給し、また、サージやノイズの影響を受けることのな
い安価な電源供給装置を提供しようとするものである。The present invention has been made to solve the above-mentioned problems, and always supplies a commercial power source to a power-supplied device in a stable manner and an inexpensive power source which is not affected by surges or noises. It is intended to provide a device.
【０００７】[0007]
【課題を解決するための手段】上記課題を解決するた
め、請求項１記載の発明は、配電線に接続された変圧器
の二次側から被給電装置に電源を供給する電源供給装置
において、配電線各相に接続された複数の変圧器の二次
側に接続されて雷サージまたはノイズを除去するサージ
阻止回路と、サージ阻止回路の出力側に接続され、供給
故障を生じた相の変圧器の二次側を健全な相の変圧器の
二次側に切り替える切替スイッチと、切替スイッチの出
力側を複数組の電源供給端子に分岐する分岐回路とを備
えたものである。In order to solve the above-mentioned problems, the invention according to claim 1 is a power supply device for supplying power from a secondary side of a transformer connected to a distribution line to a power-supplied device. Distribution line A surge blocking circuit that is connected to the secondary side of multiple transformers connected to each phase to remove lightning surge or noise, and a transformer that is connected to the output side of the surge blocking circuit and has a supply failure. And a branch circuit for branching the output side of the switch to a plurality of sets of power supply terminals.
【０００８】請求項２記載の発明は、請求項１記載の電
源供給装置において、分岐回路は、電源供給端子に接続
される被給電装置を電源供給経路から切り離すノーヒュ
ーズブレーカ等の保護素子を備えたものである。According to a second aspect of the present invention, in the power supply device according to the first aspect, the branch circuit includes a protective element such as a no-fuse breaker for disconnecting the power-supplied device connected to the power supply terminal from the power supply path. It is a thing.
【０００９】請求項３記載の発明は、請求項１または２
記載の電源供給装置において、前記変圧器が、電力会社
の借室に設置された変圧器であり、かつ、前記被給電装
置が、借室を遠方監視するために使用される装置、機器
であることを特徴とする。The invention described in claim 3 is the first or second invention.
In the power supply device according to the description, the transformer is a transformer installed in a rented room of a power company, and the power-supplied device is a device or device used to remotely monitor the rented room. It is characterized by
【００１０】[0010]
【発明の実施の形態】以下、図に沿って本発明の実施形
態を説明する。なお、図３と同一の構成要素には同一の
符号を付して詳述を省略し、以下では異なる部分を中心
に説明する。図１において、第１の変圧器Ｔａの二次側
片相の両端は、ブレーカＢ１を介して電源供給装置本体
５０内のサージ阻止回路１０に接続されている。同様に
して、第２の変圧器Ｔｂの二次側片相の両端も、ブレー
カＢ２を介してサージ阻止回路１０に接続されている。
なお、各変圧器Ｔａ，Ｔｂの一次側は、三相三線式配電
線Ｌの異なる相（例えばＵ相，Ｖ相）にそれぞれ接続さ
れている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. The same components as those in FIG. 3 are designated by the same reference numerals, and detailed description thereof will be omitted. Below, different parts will be mainly described. In FIG. 1, both ends of the secondary side single phase of the first transformer Ta are connected to the surge prevention circuit 10 in the power supply device main body 50 via the breaker B1. Similarly, both ends of the secondary side single phase of the second transformer Tb are also connected to the surge prevention circuit 10 via the breaker B2.
The primary sides of the transformers Ta and Tb are respectively connected to different phases (for example, U phase and V phase) of the three-phase three-wire distribution line L.
【００１１】図２は、上記サージ阻止回路１０の一例を
示すものであり、ブレーカーＢ１，Ｂ２の出力側の各相
ごとに、サージ吸収素子としてのバリスタ１１１〜１１
３及び１３１〜１３３と、ローパスフィルタ等のノイズ
フィルタ１２，１４とを接続して構成されている。この
サージ阻止回路１０は、線間または対地間の雷インパル
スノイズ、矩形波インパルスノイズ、高周波ノイズ等を
除去する機能を有しているため、被給電装置側で、別個
にサージまたはノイズを除去する回路を備える必要がな
い。FIG. 2 shows an example of the surge prevention circuit 10 described above. Varistors 111 to 11 as surge absorbing elements are provided for each phase on the output side of the breakers B1 and B2.
3 and 131 to 133 and the noise filters 12 and 14 such as low-pass filters are connected to each other. The surge blocking circuit 10 has a function of removing lightning impulse noise, rectangular wave impulse noise, high-frequency noise, etc. between lines or ground, so that the power-supplied device side separately removes surges or noise. No need to have circuitry.
【００１２】再び図１において、サージ阻止回路１０の
出力側には切替スイッチ２０が接続されている。この切
替スイッチ２０は、被給電装置に対する電源の供給元を
片側の相（例えばＵ相）から他側の相（Ｖ相）に切り替
えるためのものである。Referring again to FIG. 1, the changeover switch 20 is connected to the output side of the surge prevention circuit 10. The changeover switch 20 is for switching the source of power supply to the power-supplied device from one phase (for example, U phase) to the other phase (V phase).
【００１３】すなわち、この実施形態では、変圧器Ｔａ
またはＴｂの二次側の線間電圧が設定値（例えば７０
Ｖ）以下になったことを不足電圧リレー等により検出
し、切替スイッチ２０を瞬時に動作させて電源の供給元
を切り替えるようになっている。ここで、切替スイッチ
２０による切替動作は、変圧器ＴａまたはＴｂの一次側
の線間電圧を変流器等により検出して行っても良い。That is, in this embodiment, the transformer Ta
Alternatively, the line voltage on the secondary side of Tb is a set value (for example, 70
V) When the voltage becomes V or less, it is detected by an undervoltage relay or the like, and the changeover switch 20 is instantaneously operated to switch the power supply source. Here, the changeover operation by the changeover switch 20 may be performed by detecting the line voltage on the primary side of the transformer Ta or Tb with a current transformer or the like.
【００１４】更に、切替スイッチ２０の出力側には、分
岐回路３０が接続されている。この分岐回路３０は、単
相の電源入力を複数組の電源供給端子４０に分岐させる
配線を有すると共に、電源供給端子４０の各組ごとにノ
ーヒューズブレーカ等の保護素子（図示せず）を接続し
て構成されている。Further, a branch circuit 30 is connected to the output side of the changeover switch 20. The branch circuit 30 has wiring for branching a single-phase power input to a plurality of sets of power supply terminals 40, and a protection element (not shown) such as a no-fuse breaker is connected to each set of power supply terminals 40. Is configured.
【００１５】このように保護素子を介在させることで、
いずれかの被給電装置に短絡電流や過電流が流れた場合
にその電流経路を遮断し、変圧器や他の被給電装置に事
故が波及しないように配慮されている。なお、上記電源
供給端子４０のいずれかにはコンセントを接続しても良
い。By interposing the protective element in this way,
When a short-circuit current or an overcurrent flows to any of the power-supplied devices, the current path is cut off so that the accident does not spread to the transformer and other power-supplied devices. An outlet may be connected to any of the power supply terminals 40.
【００１６】以上のように構成された本実施形態では、
被給電装置に電源を供給している側の配電線や変圧器に
供給故障が発生した場合でも、切替スイッチ２０の動作
によって健全な側の相に電源供給元を瞬時に切り替える
ことができるので、被給電装置に対して継続的かつ安定
して電源を供給することができる。In the present embodiment configured as described above,
Even if a supply failure occurs in the distribution line or the transformer on the side supplying power to the power-supplied device, the operation of the changeover switch 20 allows the power supply source to be instantaneously switched to a phase on the healthy side. Power can be continuously and stably supplied to the power-supplied device.
【００１７】また、電源供給装置本体５０にサージ阻止
回路１０を備えることにより、雷インパルスノイズや矩
形波ノイズ、高周波ノイズ等が被給電装置に侵入するの
を防止することができる。更に、分岐回路３０内にノー
ヒューズブレーカ等の保護素子を備えれば、短絡事故等
の他への波及防止が可能である。加えて、電源供給端子
４０を介して被給電装置を接続すれば、コンセントを用
いる場合に比べて信頼性の高い接続状態を確保すること
ができる。Further, by providing the power supply device main body 50 with the surge prevention circuit 10, it is possible to prevent lightning impulse noise, rectangular wave noise, high frequency noise, etc. from entering the power-supplied device. Furthermore, if a protective element such as a no-fuse breaker is provided in the branch circuit 30, it is possible to prevent a short circuit accident and the like from spreading to others. In addition, if the power-supplied device is connected via the power supply terminal 40, it is possible to secure a connection state with higher reliability than in the case of using an outlet.
【００１８】なお、本発明は、借室遠方監視システムに
おける電源供給装置ばかりでなく、配電線に接続された
変圧器の二次側から電源を供給するようにした各種用途
の電源供給装置に適用することができる。上記実施形態
では二相の電源系統に接続された各変圧器の二次側を切
り替えて電源を供給するようにしているが、三相の電源
系統に接続された各変圧器の二次側を切り替えて給電し
ても良い。また、電源用変圧器は単相２線式であっても
良い。The present invention is applied not only to the power supply device in the remote monitoring system for rented rooms but also to the power supply device for various purposes in which power is supplied from the secondary side of the transformer connected to the distribution line. can do. In the above embodiment, the secondary side of each transformer connected to the two-phase power supply system is switched to supply power, but the secondary side of each transformer connected to the three-phase power supply system is You may switch and supply electricity. Further, the power supply transformer may be a single-phase two-wire type.
【００１９】[0019]
【発明の効果】以上のように請求項１記載の発明によれ
ば、電源供給元である相の配電線や変圧器に供給故障が
発生しても、電源供給元を健全な相に切り替えて給電す
ることができるため、被給電装置に対して常時安定して
商用電源を供給できる効果がある。また、サージ阻止回
路により各種のサージやノイズが被給電装置に侵入する
のを防止することができるから、被給電装置を万全に保
護することができる。同時に、複数の被給電装置側で個
別にノイズ対策を施す必要がないので、システム全体の
コスト低減にも有効である。As described above, according to the first aspect of the present invention, even if a supply failure occurs in the distribution line or the transformer of the phase that is the power supply source, the power supply source is switched to the sound phase. Since power can be supplied, commercial power can be stably supplied to the power-supplied device at all times. Further, since the surge blocking circuit can prevent various surges and noises from entering the power-supplied device, the power-supplied device can be completely protected. At the same time, it is not necessary to individually take noise countermeasures on the plurality of power-supplied devices, which is effective in reducing the cost of the entire system.
【００２０】請求項２記載の発明によれば、いずれかの
被給電装置に短絡故障等が発生した場合でも、分岐回路
内の保護素子によりこれを切り離して他の被給電装置や
系統に事故が波及するのを防止することができる。According to the second aspect of the present invention, even if a short-circuit failure occurs in any of the power-supplied devices, the protection element in the branch circuit disconnects the power-supply device to cause an accident in another power-supplied device or system. It is possible to prevent the spread.
【００２１】特に本発明は、請求３に記載したように、
電力会社の供給用変圧器室等の借室に設置された遠方監
視用の各種装置、機器の電源供給装置として最適であ
り、信頼性の高い遠方監視システムの構築に寄与するこ
とができる。Particularly, the present invention, as described in claim 3,
It is suitable as a power supply device for various devices and equipment for remote monitoring installed in a rental room such as a supply transformer room of an electric power company, and can contribute to the construction of a highly reliable remote monitoring system.
【図１】本発明の実施形態を示す回路図である。FIG. 1 is a circuit diagram showing an embodiment of the present invention.
【図２】図１の実施形態におけるサージ阻止回路の一例
を示す回路図である。FIG. 2 is a circuit diagram showing an example of a surge prevention circuit in the embodiment of FIG.
【図３】従来技術を示す回路図である。FIG. 3 is a circuit diagram showing a conventional technique.
Ｌ 配電線 Ｄ ディスコン Ｔａ，Ｔｂ，Ｔｃ 変圧器 Ｂ１，Ｂ２ ブレーカ １０ サージ阻止回路 １１１〜１１３，１３１〜１３３ バリスタ １２，１４ ノイズフィルタ ２０ 切替スイッチ ３０ 分岐回路 ４０ 電源供給端子 ５０ 電源供給装置本体 L Distribution line D Discon Ta, Tb, Tc Transformer B1, B2 Breaker 10 Surge prevention circuit 111-113, 131-133 Varistor 12, 14 Noise filter 20 Changeover switch 30 Branch circuit 40 Power supply terminal 50 Power supply device body
───────────────────────────────────────────────────── フロントページの続き (71)出願人 000220907 東光電気株式会社 東京都千代田区有楽町１丁目７番１号 (72)発明者 神野 誠雄 東京都千代田区内幸町１丁目１番３号 東 京電力株式会社内 (72)発明者 金子 俊男 東京都千代田区内幸町１丁目１番３号 東 京電力株式会社内 (72)発明者 倉島 克則 東京都千代田区丸ノ内２丁目６番１号 古 河電気工業株式会社内 (72)発明者 阿部 剛 東京都千代田区丸ノ内２丁目６番１号 古 河電気工業株式会社内 (72)発明者 春名 治 東京都千代田区丸ノ内２丁目２番３号 三 菱電機株式会社内 (72)発明者 横井 昭二 愛知県名古屋市瑞穂区須田町２番56号 日 本碍子株式会社内 (72)発明者 奥苑 直昭 東京都千代田区有楽町１丁目７番１号 東 光電気株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (71) Applicant 000220907 Toko Electric Co., Ltd. 1-7 Yurakucho, Chiyoda-ku, Tokyo (72) Inventor Masao Jinno 1-3-1 Uchiyuki-cho, Chiyoda-ku, Tokyo Tokyo Electric Power Co., Inc. In-house (72) Inventor Toshio Kaneko 1-3-1, Uchisaiwaicho, Chiyoda-ku, Tokyo Tokyo Electric Power Company (72) Inventor Katsunori Kurashima 2-6-1 Marunouchi, Chiyoda-ku, Tokyo Furukawa Electric Co., Ltd. (72) Inventor Go Abe 2-6-1, Marunouchi, Chiyoda-ku, Tokyo Furukawa Electric Co., Ltd. (72) Inventor Haruna Osamu 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Sanryo Electric Co., Ltd. (72) Inventor Shoji Yokoi 2-56, Sudamachi, Mizuho-ku, Nagoya-shi, Aichi Nihon Inshiko Co., Ltd. (72) Inventor Naoaki Okuen, Chiyoda, Tokyo Yurakucho 1-chome No. 7 No. 1 East light electrical within Co., Ltd.
Claims (3)
被給電装置に電源を供給する電源供給装置において、 配電線各相に接続された複数の変圧器の二次側に接続さ
れて雷サージまたはノイズを除去するサージ阻止回路
と、 サージ阻止回路の出力側に接続され、供給故障を生じた
相の変圧器の二次側を健全な相の変圧器の二次側に切り
替える切替スイッチと、 切替スイッチの出力側を複数組の電源供給端子に分岐す
る分岐回路と、 を備えたことを特徴とする電源供給装置。1. A power supply device for supplying power to a power-supplied device from the secondary side of a transformer connected to a distribution line, which is connected to the secondary side of a plurality of transformers connected to each phase of the distribution line. Connected to the output side of the surge prevention circuit and the surge prevention circuit that removes lightning surge or noise, and switches the secondary side of the transformer of the phase where the supply failure has occurred to the secondary side of the transformer of the healthy phase A power supply device comprising: a switch; and a branch circuit that branches an output side of the changeover switch into a plurality of sets of power supply terminals.
源供給経路から切り離す保護素子を備えたことを特徴と
する電源供給装置。2. The power supply device according to claim 1, wherein the branch circuit includes a protection element that disconnects the power-supplied device connected to the power supply terminal from the power supply path.
おいて、 前記変圧器が、電力会社の借室に設置された変圧器であ
り、かつ、前記被給電装置が、借室を遠方監視するため
に使用される装置、機器であることを特徴とする電源供
給装置。3. The power supply device according to claim 1, wherein the transformer is a transformer installed in a rental room of a power company, and the power-supplied device remotely monitors the rental room. A power supply device, which is a device or device used for the purpose.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7322323A JPH09140061A (en) | 1995-11-16 | 1995-11-16 | Power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7322323A JPH09140061A (en) | 1995-11-16 | 1995-11-16 | Power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09140061A true JPH09140061A (en) | 1997-05-27 |
Family
ID=18142361
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7322323A Withdrawn JPH09140061A (en) | 1995-11-16 | 1995-11-16 | Power supply |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09140061A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015137752A1 (en) * | 2014-03-12 | 2015-09-17 | 정기영 | Booster pump control system having dual alternate control unit |
-
1995
- 1995-11-16 JP JP7322323A patent/JPH09140061A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015137752A1 (en) * | 2014-03-12 | 2015-09-17 | 정기영 | Booster pump control system having dual alternate control unit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20030204 |