CN105680425A - Plug-type current switching terminal for relay protection device - Google Patents
Plug-type current switching terminal for relay protection device Download PDFInfo
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- CN105680425A CN105680425A CN201610035268.8A CN201610035268A CN105680425A CN 105680425 A CN105680425 A CN 105680425A CN 201610035268 A CN201610035268 A CN 201610035268A CN 105680425 A CN105680425 A CN 105680425A
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- plug
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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Abstract
The invention provides a plug-type current switching terminal for a relay protection device, relates to a current switching technology for a 220kV line relay protection device for a substation, and aims at solving the problems that the operation steps are complicated, an open circuit of a current transformer is easily caused and a person and equipment are damaged when a bypass switch with a line switch carries out switching operation. A plug-type design is adopted by current connecting plates and current terminal short-circuit connecting plates; holes are formed in the middle parts; the peripheries of the holes in the middle parts of the current terminal short-circuit connecting plates are made of an insulating material; when the current terminal short-circuit connecting plates slide upwards, present line current injection binding posts are in a short circuit; when the current terminal short-circuit connecting plates slide downwards, bypass current injection binding posts are in the short circuit; and insulating sheaths are arranged at the upper ends and the lower ends of the current connecting plates and the current terminal short-circuit connecting plates. The plug-type current switching terminal is flexible, reliable and safe to operate; current terminals do not generate a short-circuit phenomenon; the protection device safely runs; and the plug-type current switching terminal is suitable for 220kV and above line relay protection device of the substation.
Description
Technical field
The present invention relates to the current switching technology of transformer station 220kV circuit relay protection device.
Background technology
At present, adopting single busbar or the double-bus 220kV transformer station with bypass connection mode, when carrying out by-pass switch for line sending way switch grid switching operation, needs will be overlapped protection device entire screen switch to bypassing operation for circuit second, except the corresponding protection of switching connects off-chip during handover operation, also current terminal is switched to by-pass current leading-in end from by band circuit current feedthrough, first must connect sheet with outer layer in handover operation process will by the short circuit of band circuit current terminal, then internal layer is connected sheet again and switches to bypass end, need to connect sheet by 8 during handover operation and remove and reinstall on corresponding binding post, operating procedure is complicated and very easily causes current transformer open fault, give the person, equipment damages.
Summary of the invention
When the invention aims to solve by-pass switch for line sending way switch grid switching operation; operating procedure is complicated and very easily causes current transformer to open a way; give the problem that the person, equipment damage, it is provided that a kind of plug-in type current switching terminal for protective relaying device.
Plug-in type current switching terminal for protective relaying device of the present invention includes route protection screen and bypass protection screen two parts; Described route protection screen includes No. one four plug-in type electric current connection 1, the plug-in type current terminal short circuit of sheet that is connected and connects 2, four these line currents introducing binding posts 3, four No. protection device electric currents introducing binding posts 4 of sheet and four by-pass currents introducing binding posts 5;
No. one four plug-in type electric current that is connected is connected sheet 1 and is formed by connecting by the connection handle 7 that insulate by four single-phase plug-in type electric currents connection sheets 13, and each single-phase plug-in type electric current connects the mid portion of sheet 13 and is provided with Long Circle hole; The both sides of a number plug-in type current terminal short circuit connection sheet 2 respectively arrange a Long Circle hole, and the mid portion of a plug-in type current terminal short circuit connection sheet 2 is empty;
Each this line current introduces binding post 3, each protection device electric current introduces binding post 4 and each by-pass current introduces binding post 5 and is all disposed with internal layer fixed knob 6 and outer layer fixed knob 14 along respective length direction;
Four Long Circle holes of No. one four plug-in type electric current connection sheet 1 that is connected are respectively fitted over four No. one protection device electric current and introduce on binding post 4, and are positioned at the inner side of internal layer fixed knob; Two Long Circle holes of a number plug-in type current terminal short circuit connection sheet 2 are respectively fitted over a protection device electric current of both sides and introduce on binding post 4, and are positioned at the inner side of outer layer fixed knob;
One end that four single-phase plug-in type electric currents of route protection screen connect sheet 13 is corresponding with four these line currents introducing binding posts 3 respectively; It is corresponding that the other end of four single-phase plug-in type electric current connection sheets 13 introduces binding posts 5 with four by-pass currents respectively;
Bypass protection screen includes No. two four plug-in type electric currents that are connected and connects 9, No. two plug-in type current terminal short circuits connection 10, four No. two by-pass current output wiring terminals of sheet 11 of sheet and four No. two by-pass currents introducing binding posts 12;
No. two four be connected plug-in type electric current connect sheet 9 be connected with No. one four plug-in type electric current connection sheet 1 structure identical, No. two plug-in type current terminal short circuit connection sheets 10 are identical with plug-in type current terminal short circuit connection sheet 2 structure, No. two by-pass current output wiring terminals 11 are identical with by-pass current introducing binding post 5 structure, and No. two by-pass current introducing binding posts 12 are identical with this line current introducing binding post 3 structure;
Four Long Circle holes of No. two four plug-in type electric current connection sheets 9 that are connected are respectively fitted on four No. two by-pass current output wiring terminals 11, and are positioned at the inner side of internal layer fixed knob; Two Long Circle holes of No. two plug-in type current terminal short circuit connection sheets 10 are respectively fitted on No. two by-pass current output wiring terminals 11 of both sides, and are positioned at the inner side of outer layer fixed knob;
One end that four single-phase plug-in type electric currents of bypass protection screen connect sheet 13 is corresponding with four No. two by-pass currents introducing binding posts 12 respectively;
The two ends that No. one four plug-in type electric current that is connected connects the two ends of sheet 1, plug-in type current terminal short circuit connects the two ends of sheet 2, No. two four plug-in type electric currents that are connected connect the two ends of sheet 9 and No. two plug-in type current terminal short circuits connect sheets 10 are provided with insulating sheath.
In the present invention, plug-in type current terminal short circuit connects employing insulant around the Long Circle hole of sheet and makes, plug-in type electric current connects sheet and plug-in type current terminal short circuit connects sheet and all adopts plug-in type to manufacture and design, flexible to operation, and misoperation fault will not occur; This line current introduces binding post, protection device electric current introduces binding post and by-pass current introduces binding post and all adopts double layer design, plug-in type electric current connects sheet and plug-in type current terminal short circuit connects sheet and is separately mounted to internal layer and outer layer, simple in construction, flexible operation, it is not susceptible to maloperation; And each connection sheet two ends are all with insulating sheath, connection sheet is not only played insulating effect by insulating sheath, it is also possible to promote insulating protection when connecting sheet as operator; Plug-in type current terminal short circuit connects employing insulant around the Long Circle hole of sheet both sides and makes, it is possible to prevent at the short circuit either end period of the day from 11 p.m. to 1 a.m, causes protection device electric current to introduce binding post short circuit; Secure it within relevant position by the tightening knob on the sub-binding post of current feedthrough, it is ensured that connect sheet and contact good normal operation with binding post simultaneously.
The present invention is made without the complex operations of multiple connection sheet dismounting; when solving 220kV and above transformer station's bypass replacement line sending road grid switching operation; easily there is a fault difficult problem for Current Transformer Secondary open circuit; ensure that flexible operation, reliable, maloperation will not be occurred to cause on the basis of personal injury, equipment fault; in turn ensure that current terminal will not be short-circuited phenomenon; protection equipment safety is made to run; disclosure satisfy that equipment runs the safety need with grid switching operation, it is adaptable to 220kV and above substation line protection device.
Accompanying drawing explanation
Fig. 1 is the structural representation that No. one four plug-in type electric current that is connected connects sheet 1;
Fig. 2 is the structural representation that a plug-in type current terminal short circuit connects sheet 2;
Fig. 3 is the structural representation of electric current binding post, wherein 6 represent internal layer knob, 14 represent outer layer knob, and this line current introduces binding post 3, and protects 4, by-pass current introducing 5, No. two by-pass current output wiring terminal 11 of binding post of device electric current introducing binding post and No. two by-pass currents to introduce binding post 12 and all can adopt this structure identical;
Fig. 4 be protective relaying device be under normal operating conditions, the state of route protection screen portion inner layer pressing plate;
Fig. 5 is that protective relaying device is under normal operating conditions and switches under by-path running status, the state of route protection screen portion outer layer pressing plate;
Fig. 6 be protective relaying device be under normal operating conditions, the state of bypass protection screen portion inner layer pressing plate;
Fig. 7 be protective relaying device be under normal operating conditions, the state of bypass protection screen portion outer layer pressing plate;
Fig. 8 be protective relaying device be under by-path running status, the state of route protection screen portion inner layer pressing plate;
Fig. 9 is in route protection screen current terminal handoff procedure, the state of route protection screen portion outer layer pressing plate;
Figure 10 be protective relaying device be under by-path running status, the state of bypass protection screen portion inner layer pressing plate;
Figure 11 be protective relaying device be under by-path running status, the state of bypass protection screen portion outer layer pressing plate;
Figure 12 is the structural representation of insulating sheath.
Detailed description of the invention
Detailed description of the invention one: present embodiment is described in conjunction with Fig. 1 to Figure 11, the plug-in type current switching terminal for protective relaying device described in present embodiment includes route protection screen and bypass protection screen two parts;
Described route protection screen includes No. one four plug-in type electric current connection 1, the plug-in type current terminal short circuit of sheet that is connected and connects 2, four these line currents introducing binding posts 3, four No. protection device electric currents introducing binding posts 4 of sheet and four by-pass currents introducing binding posts 5;
No. one four plug-in type electric current that is connected is connected sheet 1 and is formed by connecting by the connection handle 7 that insulate by four single-phase plug-in type electric currents connection sheets 13, and each single-phase plug-in type electric current connects the mid portion of sheet 13 and is provided with Long Circle hole; The both sides of a number plug-in type current terminal short circuit connection sheet 2 respectively arrange a Long Circle hole, and the mid portion of a plug-in type current terminal short circuit connection sheet 2 is empty;
Each this line current introduces binding post 3, each protection device electric current introduces binding post 4 and each by-pass current introduces binding post 5 and is all disposed with internal layer fixed knob and outer layer fixed knob along respective length direction;
Four Long Circle holes of No. one four plug-in type electric current connection sheet 1 that is connected are respectively fitted over four No. one protection device electric current and introduce on binding post 4, and are positioned at the inner side of internal layer fixed knob;Number plug-in type current terminal short circuit connects two Long Circle holes of sheet 2 and is respectively fitted over a protection device electric current of both sides and introduces on binding post 4 (i.e. A connect terminal and N connects terminal), and is positioned at the inner side of outer layer fixed knob;
One end that four single-phase plug-in type electric currents of route protection screen connect sheet 13 is corresponding with four these line currents introducing binding posts 3 respectively; It is corresponding that the other end of four single-phase plug-in type electric current connection sheets 13 introduces binding posts 5 with four by-pass currents respectively;
Bypass protection screen includes No. two four plug-in type electric currents that are connected and connects 9, No. two plug-in type current terminal short circuits connection 10, four No. two by-pass current output wiring terminals of sheet 11 of sheet and four No. two by-pass currents introducing binding posts 12;
No. two four be connected plug-in type electric current connect sheet 9 be connected with No. one four plug-in type electric current connection sheet 1 structure identical, No. two plug-in type current terminal short circuit connection sheets 10 are identical with plug-in type current terminal short circuit connection sheet 2 structure, No. two by-pass current output wiring terminals 11 are identical with by-pass current introducing binding post 5 structure, and No. two by-pass current introducing binding posts 12 are identical with this line current introducing binding post 3 structure;
Four Long Circle holes of No. two four plug-in type electric current connection sheets 9 that are connected are respectively fitted on four No. two by-pass current output wiring terminals 11, and are positioned at the inner side of internal layer fixed knob; No. two plug-in type current terminal short circuits connect two Long Circle holes of sheets 10 and are respectively fitted on No. two by-pass current output wiring terminals 11 (i.e. A connect terminal and N connects terminal) of both sides, and are positioned at the inner side of outer layer fixed knob;
One end that four single-phase plug-in type electric currents of bypass protection screen connect sheet 13 is corresponding with four No. two by-pass currents introducing binding posts 12 respectively;
The two ends that No. one four plug-in type electric current that is connected connects the two ends of sheet 1, plug-in type current terminal short circuit connects the two ends of sheet 2, No. two four plug-in type electric currents that are connected connect the two ends of sheet 9 and No. two plug-in type current terminal short circuits connect sheets 10 are provided with insulating sheath.
In present embodiment, in circuit sealer part, this line current introduces binding post 3, and protects device electric current introducing binding post 4 and a by-pass current to introduce binding post 5 and can adopt identical structure, i.e. structure shown in Fig. 3. No. one four plug-in type electric current that is connected connects sheet 1 and is commonly called as interior laminate, a number plug-in type current terminal short circuit connects sheet 2 and is commonly called as outer laminate, interior laminate can move up and down, and after moving up, the internal layer knob of this line current introducing binding post 3 can by interior laminate upper end locking; After moving down, interior laminate lower end can be locked by the internal layer knob of a by-pass current introducing binding post 5; In like manner, the outer layer knob of outer laminate and this line current introducing binding post 3 and the outer layer knob of a by-pass current introducing binding post 5 match. Bypass protection screen part does not have this line current to introduce binding post, and only by-pass current output wiring terminal and by-pass current introduce binding post.
As shown in Figure 4 and Figure 5, protective relaying device is under normal operating conditions, namely under circuit running status: in circuit sealer part, interior laminate is connected to this line current and introduces between binding post 3 and a protection device electric current introducing binding post 4, outer laminate mediates, and does not introduce binding post 3 with this line current and a by-pass current introduces binding post 5 and is connected; In bypass protection screen part, interior laminate mediates, and does not introduce binding post 12 with No. two by-pass currents and is connected, and outer laminate is connected to No. two by-pass current output wiring terminals 11 and No. two by-pass currents introduce between binding post 12.
When needing with by-pass switch for line sending way switch (namely switching to the state of Fig. 8 from the state of Fig. 4), first an insulating sheath plug-in type current terminal short circuit connecting sheet 2 upper end takes off, open a protection device electric current and introduce the outer layer fixed knob of binding post 4, a number plug-in type current terminal short circuit connects sheet 2 push this line current introducing binding post 3 outer layer fixed knob place and screw four phase knobs (switching to the state of Fig. 9 from the state of Fig. 5), by the short circuit of this line current, then take off a plug-in type electric current and connect the insulating sheath of sheet 1 lower end, open this line current introduce binding post 3 and protect the internal layer fixed knob of a protection unit electric current introducing binding post 4, number plug-in type electric current connects sheet 1 lower end push a by-pass current and introduce binding post 5 and screw the internal layer four that a protection device electric current introduces binding post 4 and by-pass current introduces binding post 5 and fix knob, put a plug-in type electric current and connect the insulating sheath of sheet 1 upper end, bypass protection screen portion inner layer pressing plate then switches to the state of Figure 10 from the state of Fig. 6, bypass protection screen portion outer layer pressing plate then switches to the state of Figure 11 from the state of Fig. 7, put outer laminate insulating sheath. after by band line switching and by-pass switch off-the-line, a plug-in type current terminal short circuit is connected sheet 2 and is pushed into original position and puts insulating sheath.
When recovering to be run by belt switch (switching to the state of Fig. 4 from the state of Fig. 8), first an insulating sheath current terminal short circuit connecting sheet 2 lower end takes off, open a protection device electric current and introduce the outer layer fixed knob of binding post 4, a number plug-in type current terminal short circuit connects sheet 2 push the outer layer fixed knob place of a by-pass current introducing binding post 5 and screw four phase knobs, by by-pass current short circuit, then take off a plug-in type electric current and connect the insulating sheath of sheet 1 upper end, open a by-pass current and introduce binding post 5 and the internal layer fixed knob of protection device electric current introducing binding post 4, its upper end is pushed this line current and introduces the internal layer fixed knob place of binding post 3, and the internal layer four screwing a protection device electric current introducing binding post 4 and this line current introducing binding post 3 fixes knob, put a plug-in type electric current and connect the insulating sheath of sheet 1 lower end, after by belt switch and by-pass switch off-the-line, a number plug-in type current terminal short circuit is connected sheet, and (2 are pushed into original position and put insulating sheath. bypass protection screen portion inner layer pressing plate then switches to the state of Fig. 6 from the state of Figure 10, and bypass protection screen portion outer layer pressing plate then switches to the state of 7 from the state of Figure 11, and puts insulating sheath.
Detailed description of the invention two: present embodiment is described in conjunction with Fig. 1; present embodiment is the further restriction to the plug-in type current switching terminal for protective relaying device described in embodiment one; in present embodiment, each single-phase plug-in type electric current connects the two ends of sheet 13 and all has semicircular indentations. Semicircular indentations and this line current introducing binding post 3 and a by-pass current introduce binding post 5 and match, and make single-phase plug-in type electric current connect sheet 13 and introduce binding post 5 contact tightr with this line current introducing binding post 3 and a by-pass current.
Claims (2)
1. for the plug-in type current switching terminal of protective relaying device, including route protection screen and bypass protection screen two parts; Described route protection screen includes No. one four plug-in type electric current connection sheet (1) that is connected, a plug-in type current terminal short circuit connects sheet (2), four these line currents introducing binding post (3), four No. one protection device electric currents introducing binding post (4) and four by-pass currents introducing binding post (5);
It is characterized in that:
No. one four plug-in type electric current that is connected is connected sheet (1) and is formed by connecting by the connection handle (7) that insulate by four single-phase plug-in type electric currents connection sheet (13), and each single-phase plug-in type electric current connects the mid portion of sheet (13) and is provided with Long Circle hole; The both sides of number plug-in type current terminal short circuit connection sheet (2) respectively arrange a Long Circle hole, and the mid portion of plug-in type current terminal short circuit connection sheet (2) is empty;
Each this line current introduces binding post (3), each protection device electric current introduces binding post (4) and each by-pass current introduces binding post (5) and is all disposed with internal layer fixed knob and outer layer fixed knob along respective length direction;
Four Long Circle holes of No. one four plug-in type electric current connection sheet (1) that is connected are respectively fitted over four No. one protection device electric current and introduce on binding post (4), and are positioned at the inner side of internal layer fixed knob; Two Long Circle holes of number plug-in type current terminal short circuit connection sheet (2) are respectively fitted over a protection device electric current of both sides and introduce on binding post (4), and are positioned at the inner side of outer layer fixed knob;
One end that four single-phase plug-in type electric currents of route protection screen connect sheet (13) is corresponding with four these line currents introducing binding post (3) respectively; It is corresponding that the other end of four single-phase plug-in type electric currents connection sheet (13) introduces binding post (5) with four by-pass currents respectively;
Bypass protection screen includes No. two four plug-in type electric currents that are connected and connects sheet (9), No. two plug-in type current terminal short circuits connection sheet (10), four No. two by-pass current output wiring terminals (11) and four No. two by-pass currents introducing binding post (12);
No. two four be connected plug-in type electric current connect sheet (9) be connected with No. one four plug-in type electric current connection sheet (1) structure identical, No. two plug-in type current terminal short circuits connection sheet (10) are identical with plug-in type current terminal short circuit connection sheet (2) structure, No. two by-pass current output wiring terminals (11) are identical with by-pass current introducing binding post (5) structure, and No. two by-pass currents introducing binding post (12) are identical with this line current introducing binding post (3) structure;
Four Long Circle holes of No. two four plug-in type electric currents connection sheet (9) that are connected are respectively fitted on four No. two by-pass current output wiring terminals (11), and are positioned at the inner side of internal layer fixed knob; Two Long Circle holes of No. two plug-in type current terminal short circuits connection sheet (10) are respectively fitted on No. two by-pass current output wiring terminals (11) of both sides, and are positioned at the inner side of outer layer fixed knob;
One end that four single-phase plug-in type electric currents of bypass protection screen connect sheet (13) is corresponding with four No. two by-pass currents introducing binding post (12) respectively;
The two ends that No. one four plug-in type electric current that is connected connects the two ends of sheet (1), plug-in type current terminal short circuit connects the two ends of sheet (2), No. two four plug-in type electric currents that are connected connect the two ends of sheet (9) and No. two plug-in type current terminal short circuits connect sheet (10) are provided with insulating sheath.
2. the plug-in type current switching terminal for protective relaying device according to claim 1, it is characterised in that each single-phase plug-in type electric current connects the two ends of sheet (13) and all has semicircular indentations.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610035268.8A CN105680425B (en) | 2016-01-19 | 2016-01-19 | Plug-in type current switching terminal for protective relaying device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610035268.8A CN105680425B (en) | 2016-01-19 | 2016-01-19 | Plug-in type current switching terminal for protective relaying device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105680425A true CN105680425A (en) | 2016-06-15 |
| CN105680425B CN105680425B (en) | 2018-04-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610035268.8A Active CN105680425B (en) | 2016-01-19 | 2016-01-19 | Plug-in type current switching terminal for protective relaying device |
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| CN (1) | CN105680425B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106486271A (en) * | 2016-10-18 | 2017-03-08 | 国网山东省电力公司烟台供电公司 | A kind of new-type current transformer connecting terminal |
| CN109309434A (en) * | 2018-11-23 | 2019-02-05 | 上海电机系统节能工程技术研究中心有限公司 | A kind of motor general assembly connection sheet optimization connection based on intelligence manufacture |
| CN110365106A (en) * | 2019-05-28 | 2019-10-22 | 贵州电网有限责任公司 | State monitoring apparatus is moved back in a kind of throwing of transforming plant protecting hard pressing plate |
| CN112072618A (en) * | 2020-08-03 | 2020-12-11 | 广东电网有限责任公司 | Main transformer CT secondary current linkage switching terminal with single bus provided with bypass |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106486271A (en) * | 2016-10-18 | 2017-03-08 | 国网山东省电力公司烟台供电公司 | A kind of new-type current transformer connecting terminal |
| CN109309434A (en) * | 2018-11-23 | 2019-02-05 | 上海电机系统节能工程技术研究中心有限公司 | A kind of motor general assembly connection sheet optimization connection based on intelligence manufacture |
| CN110365106A (en) * | 2019-05-28 | 2019-10-22 | 贵州电网有限责任公司 | State monitoring apparatus is moved back in a kind of throwing of transforming plant protecting hard pressing plate |
| CN110365106B (en) * | 2019-05-28 | 2023-05-23 | 贵州电网有限责任公司 | Substation protection hard pressing plate switching state monitoring device |
| CN112072618A (en) * | 2020-08-03 | 2020-12-11 | 广东电网有限责任公司 | Main transformer CT secondary current linkage switching terminal with single bus provided with bypass |
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| Publication number | Publication date |
|---|---|
| CN105680425B (en) | 2018-04-13 |
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Address after: Suihua City, Heilongjiang Province, 152061 West Road No. 38 Applicant after: SUIHUA POWER SUPPLY COMPANY, STATE GRID HEILONGJIANG ELECTRIC POWER CO., LTD. Applicant after: State Grid Corporation of China Address before: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Applicant before: State Grid Corporation of China Applicant before: SUIHUA POWER SUPPLY COMPANY, STATE GRID HEILONGJIANG ELECTRIC POWER CO., LTD. |
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Inventor after: Du Zhongqiu Inventor after: Yu Xiulong Inventor after: Li Zonglin Inventor after: Yang Liangliang Inventor after: Lu Xi Inventor after: Wang Yanchuan Inventor after: Sun Yujun Inventor after: Wang Chunhui Inventor after: Hui Shijun Inventor after: Liu Fagang Inventor after: Zhang Wei Inventor after: Zhang Guibin Inventor after: Wang Limin Inventor before: Du Zhongqiu Inventor before: Wang Yanchuan Inventor before: Wang Chunhui Inventor before: Hui Shijun Inventor before: Liu Fagang Inventor before: Zhang Guibin Inventor before: Wang Limin |
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