CN211656121U - Hydropower station unit air brake state monitoring loop - Google Patents
Hydropower station unit air brake state monitoring loop Download PDFInfo
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- CN211656121U CN211656121U CN202020304507.7U CN202020304507U CN211656121U CN 211656121 U CN211656121 U CN 211656121U CN 202020304507 U CN202020304507 U CN 202020304507U CN 211656121 U CN211656121 U CN 211656121U
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Abstract
The utility model relates to the technical field of hydropower station unit monitoring, and discloses a hydropower station unit air brake state monitoring loop, which comprises a plurality of air brake travel switches corresponding to the air brakes of the hydropower station unit one by one, wherein the open contacts of all the air brake travel switches are connected in series to form an air brake falling judgment branch, the closed contacts of all the air brake travel switches are connected in series to form an air brake jacking judgment branch, one end of the air brake falling judgment branch and one end of the air brake jacking judgment branch are respectively and electrically connected with a high-level power VCC, so that the output level state of the other ends of the two branches can be utilized to correctly identify the air brake falling state, the air brake jacking state and the air brake abnormal state, the contact state of the air brake can be utilized to the maximum extent to reflect the real state of the air brake, the purpose of expanding the identification state is realized, and finally the misjudgment of operating personnel is effectively avoided, the safe and stable operation of the unit is ensured.
Description
Technical Field
The utility model belongs to the technical field of power station unit control, specifically, relate to a power station unit air brake state monitoring circuit.
Background
Before the hydropower station unit is started, all the hydropower station unit air brakes are required to be ensured to fall completely, so that the air brakes are prevented from being worn by the engine in an air brake adding state (namely an air brake jacking state), and the safe operation of the unit is ensured. In the existing air brake state monitoring loop, stroke switch open contacts corresponding to air brakes one by one are connected in series, then when the air brakes are jacked up, a monitoring system judges that the air brakes are jacked up as long as one open contact is disconnected, and when the air brakes fall down and all the stroke switch open contacts are completely connected, the monitoring system judges that the air brakes fall down.
However, the above-mentioned damper state monitoring circuit has the following problems or disadvantages: (1) when the air brake is jacked, as only one open contact is disconnected, the air brake is jacked, and all the air brakes can not be completely reflected to be in a jacked state; (2) if the contact of the air brake travel switch is not adjusted or the contacts of the travel switch are adhered (namely, when the air brake is jacked up, part of the contacts of the air brake travel switch are still in a conducting state), the situation that part of the air brake does not fall completely, but the contacts of the air brake travel switch are completely conducted can occur, so that a monitoring system and an operator can judge the air brake state by mistake, the air brake is worn by turning the machine under the condition that the air brake is added, and the safe operation of a unit is not facilitated.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem that the decision state that present air brake state monitoring circuit exists is limited and easy erroneous judgement, the utility model aims to provide a novel power station unit air brake state monitoring circuit can utilize the true state of air brake travel switch contact state reaction air brake to the furthest, effectively avoids the operating personnel erroneous judgement, ensures the unit safety and stability operation.
The utility model discloses the technical scheme who adopts does:
a monitoring loop for states of wind brakes of a hydropower station unit comprises a plurality of wind brake travel switches which correspond to the wind brakes of the hydropower station unit one by one, wherein open contacts of all the wind brake travel switches are connected in series to form a wind brake falling judgment branch, and closed contacts of all the wind brake travel switches are connected in series to form a wind brake jacking judgment branch;
the system comprises a wind brake falling judging branch, a wind brake jacking judging branch, a high-level power supply, a high-.
The hydropower station unit wind brake lifting state judgment device is characterized by further comprising a human-computer interaction device, wherein the human-computer interaction device is electrically connected with the hydropower station unit wind brake falling state judgment output end and the hydropower station unit wind brake lifting state judgment output end respectively.
The system further comprises a first NOT gate and a first AND gate, wherein the input end of the first NOT gate is electrically connected with the wind brake jacking state judgment output end of the hydropower station unit, the two input ends of the first AND gate are respectively and electrically connected with the wind brake falling state judgment output end of the hydropower station unit and the output end of the first NOT gate, and the output end of the first AND gate is used as an effective wind brake falling state end of the hydropower station unit and is electrically connected with a first trigger end of the man-machine interaction device.
The system further comprises a second NOT gate and a second AND gate, wherein the input end of the second NOT gate is electrically connected with the wind brake falling state judgment output end of the hydropower station unit, the two input ends of the second AND gate are respectively and electrically connected with the wind brake jacking state judgment output end of the hydropower station unit and the output end of the second NOT gate, and the output end of the second AND gate is used as an effective wind brake jacking state end of the hydropower station unit and is electrically connected with a second trigger end of the human-computer interaction device.
In a detailed optimization, when the first and second NOT gate is included, the first and second NOT gate and the second AND gate further include a third NOT gate, a third AND gate and a hydropower station unit, wherein an input end of the third NOT gate is electrically connected with an output end of the second AND gate, two input ends of the third AND gate are respectively electrically connected with an output end of the first AND gate and an output end of the third NOT gate, and an output end of the third AND gate is electrically connected with an operation permission end of the hydropower station unit.
Further optimized, the system also comprises a first NOT gate, a second NOT gate, a fourth AND gate, a fifth AND gate and a first OR gate, wherein the input end of the first NOT gate is electrically connected with the wind brake jacking state judgment output end of the hydropower station unit, the input end of the second NOT gate is electrically connected with the wind brake falling state judgment output end of the hydropower station unit, two input ends of the fourth AND gate are respectively and electrically connected with a wind brake falling state judgment output end of the hydropower station unit and a wind brake jacking state judgment output end of the hydropower station unit, two input ends of the fifth AND gate are respectively and electrically connected with the output end of the first NOT gate and the output end of the second NOT gate, two input ends of the first or gate are respectively and electrically connected with the output end of the fourth and gate and the output end of the fifth and gate, and the output end of the first OR gate is used as the effective end of the hydropower station unit air brake in the abnormal state and is electrically connected with the third trigger end of the man-machine interaction equipment.
Specifically, the human-computer interaction device is a unit LCU screen on the monitoring side.
The utility model has the advantages that:
(1) the invention provides a novel hydropower station unit air brake state monitoring loop, the system comprises a plurality of air brake travel switches which are in one-to-one correspondence with air brakes of the hydropower station unit, wherein the open contacts of all the air brake travel switches are connected in series to form an air brake falling judgment branch, the closed contacts of all the air brake travel switches are connected in series to form an air brake jacking judgment branch, one end of the air brake falling judging branch and one end of the air brake jacking judging branch are respectively and electrically connected with a high-level power supply VCC, therefore, the output level state of the other end of the two branches can be utilized to correctly identify the 'air brake falling' state, the 'air brake jacking' state and the 'air brake abnormal' state, and then the real state of the air brake can be reflected by utilizing the contact state of the air brake travel switch to the maximum extent, the purpose of expanding the recognition state is realized, the misjudgment of operators is effectively avoided finally, and the safe and stable operation of the unit is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is the circuit structure schematic diagram of the utility model provides a power station unit damper state monitoring circuit.
Detailed Description
The invention will be further described with reference to the accompanying drawings and specific embodiments. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. Specific structural and functional details disclosed herein are merely illustrative of example embodiments of the invention. The present invention may, however, be embodied in many alternate forms and should not be construed as limited to the embodiments set forth herein.
It will be understood that, although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of example embodiments of the present invention.
It should be understood that, for the term "and/or" as may appear herein, it is merely an associative relationship that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, B exists alone, and A and B exist at the same time; for the term "/and" as may appear herein, which describes another associative object relationship, it means that two relationships may exist, e.g., a/and B, may mean: a exists independently, and A and B exist independently; in addition, for the character "/" that may appear herein, it generally means that the former and latter associated objects are in an "or" relationship.
It will be understood that when an element is referred to herein as being "connected," "connected," or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may be present. Conversely, if a unit is referred to herein as being "directly connected" or "directly coupled" to another unit, it is intended that no intervening units are present. In addition, other words used to describe the relationship between elements should be interpreted in a similar manner (e.g., "between … …" versus "directly between … …", "adjacent" versus "directly adjacent", etc.).
It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments of the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises," "comprising," "includes" and/or "including," when used herein, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, numbers, steps, operations, elements, components, and/or groups thereof.
It should also be noted that, in some alternative implementations, the functions/acts noted may occur out of the order noted in the figures. For example, two figures shown in succession may, in fact, be executed substantially concurrently, or the figures may sometimes be executed in the reverse order, depending upon the functionality/acts involved.
It should be understood that specific details are provided in the following description to facilitate a thorough understanding of example embodiments. However, it will be understood by those of ordinary skill in the art that the example embodiments may be practiced without these specific details. For example, systems may be shown in block diagrams in order not to obscure the examples in unnecessary detail. In other instances, well-known processes, structures and techniques may be shown without unnecessary detail in order to avoid obscuring example embodiments.
Example one
As shown in fig. 1, the monitoring circuit for monitoring states of dampers of a hydropower station unit provided in this embodiment includes a plurality of damper travel switches corresponding to the dampers of the hydropower station unit one by one, wherein open contacts of all the damper travel switches are connected in series to form a damper falling determination branch, and closed contacts of all the damper travel switches are connected in series to form a damper jacking determination branch; the utility model discloses a power station unit wind-break state decision output, including wind-break jack-up decision branch road, wind-break drop decision branch road's one end with the one end of wind-break jack-up decision branch road is electric connection high level power VCC respectively, the other end of wind-break drop decision branch road judges the output DI1 as the power station unit wind-break drop state, the other end of wind-break jack-up decision branch road judges the output DI2 as power station unit wind-break jack-up state.
As shown in fig. 1, in the specific structure of the hydraulic power plant unit air brake state monitoring circuit, for example, the number of the air brake travel switches is 6, and the specific operating principle thereof may be as follows: (1) when all the hydropower station unit wind brakes fall down, 6 open contacts are closed, 6 closed contacts are opened, at the moment, a high level (equivalent to logic '1') is output at the hydropower station unit wind brake falling state judgment output end DI1, a low level or unknown non-high level (equivalent to logic '0') is output at the hydropower station unit wind brake jacking state judgment output end DI2, and the 'wind brake falling' state can be confirmed according to the output levels of the two terminals at the moment; (2) when all the hydropower station unit air brakes do not fall down, 6 open contacts are opened, and 6 closed contacts are closed, at the moment, a low level or an unknown non-high level (equivalent to logic '0') is output at the hydropower station unit air brake falling state judgment output end DI1, a high level (equivalent to logic '1') is output at the hydropower station unit air brake jacking state judgment output end DI2, and the 'air brake jacking' state can be confirmed according to the output levels of the two terminals at the moment; (3) if the high level, the low level or the unknown non-high level is simultaneously output by the hydraulic power plant unit air brake falling state judgment output end DI1 and the hydraulic power plant unit air brake jacking state judgment output end DI2, the condition that at least one hydraulic power plant unit air brake does not fall or the open contact and/or the closed contact of at least one air brake travel switch does not work normally is reflected, and the 'abnormal air brake' state can be confirmed according to the output levels of the two terminals at the moment so as to inform maintenance personnel of on-site inspection and confirmation. In addition, the high-level power source VCC may provide, but is not limited to, 5V, 12V, or 24V dc power.
Therefore, by the hydropower station unit air brake state monitoring loop, the condition of 'abnormal air brake' can be identified while the condition of 'falling air brake' and 'jacking air brake' can be correctly identified, so that the real condition of the air brake can be reflected by the contact state of the air brake travel switch to the maximum extent, the aim of expanding the identification condition is fulfilled, the misjudgment of operators is effectively avoided, and the safe and stable operation of the unit is ensured.
Preferably, the system further comprises a man-machine interaction device, and the man-machine interaction device is electrically connected with the hydropower station unit air brake falling state judgment output end DI1 and the hydropower station unit air brake jacking state judgment output end DI2 respectively. As shown in fig. 1, the human-computer interaction device is configured to display a corresponding damper state according to an output level or logic of the hydraulic power plant unit damper falling state determination output end DI1 and the hydraulic power plant unit damper jacking state determination output end DI 2: the "damper falling" state, the "damper jacking" state, or the "damper abnormal" state may be specifically a Local Control Unit (LCU) screen on the monitoring side, and the LCU screen is a dedicated display screen for live display of the operating state, operating parameters, and measurement values of the main and auxiliary devices of the unit.
Further preferably, the system further comprises a first not gate N1 and a first and gate a1, wherein an input end of the first not gate N1 is electrically connected with a wind brake jacking state determination output end DI2 of the hydropower station unit, two input ends of the first and gate a1 are respectively electrically connected with a wind brake falling state determination output end DI1 of the hydropower station unit and an output end of the first not gate N1, and an output end of the first and gate a1 is used as a wind brake falling state effective end of the hydropower station unit and is electrically connected with a first trigger end of the human-computer interaction device. As shown in fig. 1, with the aforementioned logic circuit structure, the hydropower station unit wind brake falling state valid terminal can be enabled to output logic "1" (otherwise, logic "0") only when the hydropower station unit wind brake lifting state determination output terminal DI2 outputs logic "1" and when the hydropower station unit wind brake falling state determination output terminal DI1 outputs logic "0", so as to effectively trigger the human-computer interaction device to exhibit the "wind brake falling" state.
Preferably, the system further comprises a second not gate N2 and a second and gate a2, wherein an input end of the second not gate N2 is electrically connected with a wind brake falling state determination output end DI1 of the hydropower station unit, two input ends of the second and gate a2 are respectively electrically connected with a wind brake jacking state determination output end DI2 of the hydropower station unit and an output end of the second not gate N2, and an output end of the second and gate a2 is used as a wind brake jacking state effective end of the hydropower station unit and is electrically connected with a second trigger end of the human-computer interaction device. As shown in fig. 1, with the above logic circuit structure, the hydropower station unit wind brake jacking state valid terminal can be enabled to output logic "1" (otherwise, logic "0") only when the hydropower station unit wind brake falling state determination output terminal DI1 outputs logic "0" and when the hydropower station unit wind brake jacking state determination output terminal DI2 outputs logic "1", so as to effectively trigger the human-computer interaction device to exhibit the "wind brake jacking" state.
Further preferably, when the system comprises the first not gate N1, the first and gate a1, the second not gate N2 and the second and gate a2, the system further comprises a third not gate N3, a third and gate A3 and a hydropower station unit, wherein an input end of the third not gate N3 is electrically connected to an output end of the second and gate a2, two input ends of the third and gate A3 are electrically connected to an output end of the first and gate a1 and an output end of the third not gate N3, and an output end of the third and gate A3 is electrically connected to an operation permission end of the hydropower station unit. As shown in fig. 1, with the above logic circuit structure, only when the valid end of the wind brake of the hydropower station unit outputs a logic "1" in the falling state and the valid end of the wind brake of the hydropower station unit outputs a logic "0", the output end of the third and gate a3 outputs a logic "1" (otherwise, outputs a logic "0") to further input an effective operation permission enable signal (i.e., a high voltage level enable) to the hydropower station unit, so that only when the valid signal of the wind brake jacking disappears and the valid signal of the wind brake falling exists, the hydropower station unit is allowed to be in the operation state, otherwise, the hydropower station unit needs to alarm or stop operation, thereby further avoiding the wind brake from being worn by the engine in the wind brake plus state, and ensuring the safe operation of the unit.
Preferably, the system further comprises a first not gate N1, a second not gate N2, a fourth and gate a4, a fifth and gate a5 and a first OR gate OR1, wherein an input end of the first not gate N1 is electrically connected with a wind brake jacking state determination output end DI2 of the hydropower station unit, an input end of the second not gate N2 is electrically connected with a wind brake dropping state determination output end DI1 of the hydropower station unit, two input ends of the fourth and gate a4 are electrically connected with a wind brake dropping state determination output end DI1 and a wind brake jacking state determination output end DI2 of the hydropower station unit respectively, two input ends of the fifth and gate a5 are electrically connected with an output end of the first not gate N1 and an output end of the second not gate N2 respectively, two input ends of the first OR gate OR1 are electrically connected with an output end of the fourth and gate a4 and an output end of the fifth a5 respectively, and an output end of the first OR gate 1 is used as a man-machine-computer interaction device which is effectively connected with the third wind brake in an abnormal state of the hydropower station unit And (4) triggering the terminal. As shown in fig. 1, with the above logic circuit structure, the hydropower station unit wind brake jacking state valid terminal can output logic "1" (otherwise, logic "0") only when the hydropower station unit wind brake dropping state determination output DI1 outputs logic "0" and the hydropower station unit wind brake jacking state determination output DI2 outputs logic "0" or when the hydropower station unit wind brake jacking state determination output DI1 outputs logic "1" and the hydropower station unit wind brake jacking state determination output DI2 outputs logic "1", so as to effectively trigger the human-computer interaction device to exhibit the "wind brake abnormal" state.
To sum up, adopt the power station unit air brake state monitoring circuit that this embodiment provided, have following technological effect:
(1) the embodiment provides a novel hydropower station unit air brake state monitoring loop, which comprises a plurality of air brake travel switches corresponding to the air brakes of the hydropower station unit one by one, wherein the open contacts of all the air brake travel switches are connected in series to form an air brake falling judgment branch, the closed contacts of all the air brake travel switches are connected in series to form an air brake jacking judgment branch, one end of the air brake falling judging branch and one end of the air brake jacking judging branch are respectively and electrically connected with a high-level power supply VCC, therefore, the output level state of the other end of the two branches can be utilized to correctly identify the 'air brake falling' state, the 'air brake jacking' state and the 'air brake abnormal' state, and then the real state of the air brake can be reflected by utilizing the contact state of the air brake travel switch to the maximum extent, the purpose of expanding the recognition state is realized, the misjudgment of operators is effectively avoided finally, and the safe and stable operation of the unit is ensured.
The various embodiments described above are merely illustrative, and may or may not be physically separate, as they relate to elements illustrated as separate components; if reference is made to a component displayed as a unit, it may or may not be a physical unit, and may be located in one place or distributed over a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: modifications of the technical solutions described in the embodiments or equivalent replacements of some technical features may still be made. Such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Finally, it should be noted that the present invention is not limited to the above-mentioned alternative embodiments, and that various other forms of products can be obtained by anyone in light of the present invention. The above detailed description should not be taken as limiting the scope of the invention, which is defined in the following claims, and which can be used to interpret the claims.
Claims (7)
1. The utility model provides a power station unit air brake state monitoring circuit which characterized in that: the system comprises a plurality of air brake travel switches which correspond to air brakes of the hydropower station unit one by one, wherein the open contacts of all the air brake travel switches are connected in series to form an air brake falling judgment branch, and the closed contacts of all the air brake travel switches are connected in series to form an air brake jacking judgment branch;
the utility model discloses a power station unit wind-break state decision output, including wind-break jack-up branch road, wind-break drop judge the branch road the one end with the one end of wind-break jack-up branch road is connected high level power supply (VCC) respectively electrically, the other end of wind-break drop judge the branch road as power station unit wind-break drop state decision output (DI1), the other end of wind-break jack-up judge the branch road as power station unit wind-break jack-up state decision output (DI 2).
2. The hydroelectric generating set damper condition monitoring circuit of claim 1, wherein: the hydraulic power station unit air brake lifting state judging device further comprises a man-machine interaction device, and the man-machine interaction device is electrically connected with the hydraulic power station unit air brake falling state judging output end (DI1) and the hydraulic power station unit air brake lifting state judging output end (DI2) respectively.
3. The hydroelectric generating set damper condition monitoring circuit of claim 2, wherein: the system is characterized by further comprising a first NOT gate (N1) and a first AND gate (A1), wherein the input end of the first NOT gate (N1) is electrically connected with the hydropower station unit air brake jacking state judgment output end (DI2), the two input ends of the first AND gate (A1) are respectively and electrically connected with the hydropower station unit air brake falling state judgment output end (DI1) and the output end of the first NOT gate (N1), and the output end of the first AND gate (A1) is used as the effective end of the hydropower station unit air brake falling state and is electrically connected with a first trigger end of the man-machine interaction device.
4. A hydroelectric power generation assembly damper condition monitoring circuit as claimed in claim 3, wherein: the wind power station unit wind brake jacking state judging device is characterized by further comprising a second NOT gate (N2) and a second AND gate (A2), wherein the input end of the second NOT gate (N2) is electrically connected with the wind brake falling state judging output end (DI1) of the hydropower station unit, the two input ends of the second AND gate (A2) are respectively and electrically connected with the wind brake jacking state judging output end (DI2) of the hydropower station unit and the output end of the second NOT gate (N2), and the output end of the second AND gate (A2) is used as the effective end of the wind brake jacking state of the hydropower station unit and is electrically connected with a second trigger end of the man-machine interaction device.
5. The hydroelectric generating set damper condition monitoring circuit of claim 4, wherein: the intelligent control system is characterized by further comprising a third NOT gate (N3), a third AND gate (A3) and a hydropower station unit, wherein the input end of the third NOT gate (N3) is electrically connected with the output end of the second AND gate (A2), the two input ends of the third AND gate (A3) are respectively electrically connected with the output end of the first AND gate (A1) and the output end of the third NOT gate (N3), and the output end of the third AND gate (A3) is electrically connected with an operation permission end of the hydropower station unit.
6. The hydroelectric generating set damper condition monitoring circuit of claim 2, wherein: the wind power station unit wind brake lifting state judging device further comprises a first NOT gate (N1), a second NOT gate (N2), a fourth NOT gate (A4), a fifth NOT gate (A5) and a first OR gate (OR1), wherein the input end of the first NOT gate (N1) is electrically connected with the wind brake lifting state judging output end (DI2) of the hydropower station unit, the input end of the second NOT gate (N2) is electrically connected with the wind brake falling state judging output end (DI1) of the hydropower station unit, the two input ends of the fourth NOT gate (A4) are electrically connected with the wind brake falling state judging output end (DI1) of the hydropower station unit and the wind brake lifting state judging output end (DI2) of the hydropower station unit, the two input ends of the fifth NOT gate (A5) are electrically connected with the output end of the first NOT gate (N1) and the output end of the second NOT gate (N2), and the two input ends of the first OR gate (OR1) are electrically connected with the output end of the fourth NOT gate (A4) and the output end (A5, the output end of the first OR gate (OR1) is used as the effective end of the hydropower station unit air brake in the abnormal state to be electrically connected with the third trigger end of the man-machine interaction device.
7. The hydroelectric generating set damper condition monitoring circuit of claim 2, wherein: the man-machine interaction equipment is a unit LCU screen on the monitoring side.
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| CN202020304507.7U CN211656121U (en) | 2020-03-12 | 2020-03-12 | Hydropower station unit air brake state monitoring loop |
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| CN202020304507.7U CN211656121U (en) | 2020-03-12 | 2020-03-12 | Hydropower station unit air brake state monitoring loop |
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Address after: 614000 No.99 Gongdian Avenue, Shawan District, Leshan City, Sichuan Province Patentee after: Gongzui Hydropower Station of Guoneng Dadu River Basin Hydropower Development Co.,Ltd. Address before: 614000 No.99 Gongdian Avenue, Shawan District, Leshan City, Sichuan Province Patentee before: GONGZUI HYDROELECTRIC POWER GENERAL FACTORY OF CHINA GUODIAN DADU RIVER BASIN HYDROPOWER DEVELOPMENT Co.,Ltd. |
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