CN105140878A - High voltage falling type fuse over-current switching protective device - Google Patents
High voltage falling type fuse over-current switching protective device Download PDFInfo
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- CN105140878A CN105140878A CN201510537259.4A CN201510537259A CN105140878A CN 105140878 A CN105140878 A CN 105140878A CN 201510537259 A CN201510537259 A CN 201510537259A CN 105140878 A CN105140878 A CN 105140878A
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- fuse
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- high voltage
- overcurrent
- voltage drop
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Abstract
The invention relates to a high voltage falling type fuse over-current switching protective device, comprising an over-current switching circuit, a main fuse and an auxiliary fuse. The over-current switching circuit comprises a three-phase power supply detection circuit, DC voltage-stabilized sources and trigger circuits. The three-phase power supply detection circuit comprises three relays in parallel connection; any two phases of a three-phase power supply are respectively in connection with two DC voltage-stabilized sources; anodes are separated by diodes, are in connection with the trigger circuits after parallel connection of normally closed contacts of the three relays; each relay branch is in series connection with a trigger circuit; the trigger circuits control the switching of corresponding main fuse and auxiliary fuse. According to the invention, in case of circuit over-current, the main fuse executes a process of melt burning off, burning arc and quenching of arc, and melt loading piece falling off; a switching protective device switches a circuit into a standby circuit; the auxiliary fuse is connected, and starts to operate.
Description
Technical field
The invention belongs to electric power system technical field, relate to a kind of circuit overcurrent protective device, be specifically related to a kind of high voltage drop-out type fuse cutout overcurrent switching protection.
Background technology
Fuse switch is arranged on 10kV distribution line branch line, can power failure range be reduced, because it has an obvious cut-off point of high voltage drop-out type fuse cutout, possess the function of isolating switch, create a safety work environment to maintenance section circuit and equipment, add the sense of security of maintainer.Be arranged on distribution transformer, can as the main protection of distribution transformer, so, obtain universal in 10kV distribution line and distribution transformer.The moving contact at cartridge fuse two ends relies on fuse (melt) to fasten, and pushed by upper moving contact after " duckbilled " protuberance fuse switch divides, the upper static contact that phosphorus bronze sheet etc. are made heads on moving contact, so cartridge fuse to be stuck in " duckbilled " securely inner.When short circuit current is by fuse failure, produce electric arc, the vulcanized fiber tube of cartridge fuse liner produces a large amount of gas because being shut cartridge fuse upper end under arcing, and gas sprays to lower end, blows out electric arc.Due to fuse failure, the upper lower moving contact of cartridge fuse loses the fastening force of fuse, and under the effect of cartridge fuse self gravitation and upper and lower fixed contact spring leaf, cartridge fuse falls rapidly, and circuit is disconnected, excision faulty section circuit or faulty equipment.
Switchgear house distribution system carries the power supply of whole production and transport, employing be that the high voltage supply circuit of 10kV or 6kV directly delivers to switchgear house, by transformer transformation through control circuit to user.Department of Transportation's steel-making, large steel switchgear house high pressure inlet wire, control disjunction by high voltage drop-out type fuse cutout, because high voltage drop-out type fuse cutout is arranged on outdoor, wind, Exposure to Sunlight be many dust pollutions in addition, often come in contact bad phenomenon; Moreover, because the over load fault of low-voltage circuit makes high-voltage wire iron-melting fusing, thus cause phase shortage, when unknown cause phase shortage, can equipment burnout be caused, cause damage.Microcomputer interlock system can be paralysed and can not be used, thus affects the work of whole production and transport circuit.
Summary of the invention
In order to overcome the deficiencies in the prior art; the invention provides a kind of high voltage drop-out type fuse cutout overcurrent switching protection; when circuital current is excessive; main fuse performs and once breaks to arcing, blow-out from melt combustion; the interrupting process that fusing carrier falls; switching protective device is by circuit switching on stand-by circuit, and auxiliary fuse is connected, state of devoting oneself to work.
Technical scheme of the present invention is: a kind of high voltage drop-out type fuse cutout overcurrent switching protection, comprise overcurrent commutation circuit, main fuse and auxiliary fuse, described overcurrent commutation circuit comprises three-phase power detection circuit, D.C. regulated power supply and circuits for triggering, described three-phase power detection circuit comprises 3 relays, 3 relays are connected in parallel, any two-phase of three phase mains connects respectively two D.C. regulated power supplies, positive pole is through diode-isolated, circuits for triggering are connected to after the normally-closed contact parallel connection of 3 relays, each relay branch road is connected circuits for triggering, described circuits for triggering control the main fuse of corresponding phase and the switching of auxiliary fuse.Described overcurrent commutation circuit also comprises the panel tally circuit of three phase mains, and panel tally circuit is connected in series by diode and resistance and forms.Described main fuse and auxiliary fuse are connected and fixed by mounting panel, the lower end of main fuse is provided with contact, and the lower end of auxiliary fuse is provided with touch base, when electrical network normally runs, contact and touch base are in gate-dividing state, contact is beaten to main fuse side, main fuse work, auxiliary fuse upper end place in circuit, lower end is unsettled, during main fuse fault, contact invests touch base, and auxiliary fuse is connected.Described circuits for triggering comprise the first relay, after the first relay adhesive, make contact invest touch base.Described protective device also comprises alarm, and described alarm is in parallel with circuits for triggering.Described protective device also comprises transformation supply module, and described low-voltage power supply module is powered to overcurrent commutation circuit.Described touch base is connected by many prismatics screw rod with auxiliary fuse body, wherein prismatic portion height and touch base consistency of thickness, and top installs clamp nut and packing ring additional.Described many prismatics screw rod is prismatic screw rod.The link of described auxiliary fuse and main fuse and circuit all adopts double lead connected mode, is connected to respectively on fuse upper contact head fixed screw and binding post.
The present invention has following good effect: high voltage drop-out type fuse cutout overcurrent switching protection of the present invention; excessive at circuital current; main fuse perform once from melt combustion break to arcing, blow-out, the interrupting process that fusing carrier falls, switching protective device by circuit switching on stand-by circuit; auxiliary fuse is connected; to devote oneself to work state, avoid breakage of circuit and cause equipment burnout mutually, cause damage; and microcomputer interlock system paralysis can not use, and affects the work of whole production and transport circuit.
Accompanying drawing explanation
Fig. 1 is the protective device commutation circuit of the specific embodiment of the invention.
Fig. 2 is the fuse structure figure of the specific embodiment of the invention.
Wherein, 1, main fuse, 2, auxiliary fuse, 3, contact, 4, touch base.
Embodiment
Contrast accompanying drawing below, by the description to embodiment, the specific embodiment of the present invention is as the effect of the mutual alignment between the shape of involved each component, structure, each several part and annexation, each several part and operation principle, manufacturing process and operation using method etc., be described in further detail, have more complete, accurate and deep understanding to help those skilled in the art to inventive concept of the present invention, technical scheme.
As shown in Figure 1, be commutation circuit of the present invention, 10kV high voltage supply circuit delivers to transformer through fuse switch.Secondary side exports the three-phase alternating current of 0.4kV, delivers to bus and powers to power distribution cabinet, neutral ground through isolating switch QS.Testing circuit is exactly access 3 relay K M1, KM2, KM3 respectively in the end of incoming cables of power distribution cabinet, and for detecting three phase mains, V1-V3, R1-R3, VD1-VD3 are the panel tally circuit of three phase mains respectively.Any two-phase of three phase mains connects two D.C. regulated power supplies U1, U2 respectively, and positive pole is through diode V4, V5 isolation, and the normally-closed contact through relay K Ml-KM3 is connected respectively to relay K M4, KM5, KM6, and alarm HA.A parallel connection alarm is distinguished in KM4, KM5 side, not shown in FIG..As certain phase fuse switch blows, controlled the switching of main fuse and auxiliary fuse by the normally opened contact of KM4, KM5, KM6, auxiliary fuse is connected, state of devoting oneself to work.
When powering normal, the normally-closed contact of KM1, KM2, KM3 all disconnects, and KM4, KM5, KM6 and HA are without direct voltage.When fuse blows or loose contact cause powering abnormal, a wherein phase short of electricity of three-phase alternating current L1, L2, L3 can be made, so corresponding KM1, KM2 or KM3 not adhesive, KM4, KM5 or KM6 adhesive that its normally-closed contact closed pair is answered, controlled the switching of main fuse and auxiliary fuse by the normally opened contact of KM4, KM5, KM6, auxiliary fuse is connected, and HA sends alarm sound simultaneously.Therefore, when powering normal, indicator light instruction is normal.When high voltage drop-out type fuse cutout phase shortage, any phase phase shortage can be shown, send simultaneously alarm sound and tripping operation be switched to auxiliary fuse.
As shown in Figure 2, for the structure chart of high voltage drop-out type fuse cutout of the present invention, high voltage drop-out type fuse cutout of the present invention comprises main fuse and auxiliary fuse, main fuse and auxiliary fuse are connected and fixed by mounting panel, the lower end of main fuse is provided with contact, the lower end of auxiliary fuse is provided with touch base, when electrical network normally runs, contact and touch base are in gate-dividing state, contact is beaten to main fuse side, now, main fuse is connected, in running order, the upper end place in circuit of auxiliary fuse, lower end is unsettled, therefore an end band high voltage, no current passes through, work in backup mode.Once circuit breaks down, main fuse performs and once breaks to arcing, blow-out from melt combustion, the interrupting process that fusing carrier falls, commutation circuit detects main fuse open circuit, control contact by the normally opened contact of KM4, KM5, KM6 and invest auxiliary fuse side, contact contacts with touch base, and auxiliary fuse is connected, state of devoting oneself to work.
The switching of fusion tube of the present invention is all by the actuating of relay, and then the action of control electromagnet realizes.Because electromagnet is all need low voltage electrical equipment, and only there is high voltage source this operating mechanism position. therefore, must carry out step-down process to high voltage source, the present invention adds a transformation supply module, by converting high-tension electricity to low tension, power to relay.
Owing to passing through between contact with touch base to contact connection, if the bad meeting of contact causes the problem such as heating and lead-in wire heating, fuse switch is by copper, the assembly that aluminium conductor and porcelain piece are formed, fixed contact is connected by screw with porcelain piece, there is no stopping means, under external force, contact and touch base misplace, impact contact, for this improves with touch base structure and lead-in wire as shown in the figure to fuse switch contact: the screw design of fixing touch base becomes many prismatics, wherein prismatic portion height is consistent with touch base copper plate thickness, top installs clamp nut and packing ring additional, make touch base fixed screw loosen and the bad problem of conductive portions contact effectively solved.
Frequently blow problem for preventing or reducing upper lead-in wire, fuse switch wiring adopts double lead, is connected to respectively on fuse switch upper contact head fixed screw and binding post, avoids contact generate heat and blow lead-in wire.
Above by reference to the accompanying drawings to invention has been exemplary description; obvious specific implementation of the present invention is not subject to the restrictions described above; as long as have employed the improvement of the various unsubstantialities that method of the present invention is conceived and technical scheme is carried out; or design of the present invention and technical scheme directly applied to other occasion, all within protection scope of the present invention without to improve.
Claims (9)
1. a high voltage drop-out type fuse cutout overcurrent switching protection, it is characterized in that, comprise overcurrent commutation circuit, main fuse and auxiliary fuse, described overcurrent commutation circuit comprises three-phase power detection circuit, D.C. regulated power supply and circuits for triggering, described three-phase power detection circuit comprises 3 relays, 3 relays are connected in parallel, any two-phase of three phase mains connects respectively two D.C. regulated power supplies, positive pole is through diode-isolated, circuits for triggering are connected to after the normally-closed contact parallel connection of 3 relays, each relay branch road is connected circuits for triggering, described circuits for triggering control the main fuse of corresponding phase and the switching of auxiliary fuse.
2. high voltage drop-out type fuse cutout overcurrent switching protection according to claim 1, is characterized in that, described overcurrent commutation circuit also comprises the panel tally circuit of three phase mains, and panel tally circuit is connected in series by diode and resistance and forms.
3. high voltage drop-out type fuse cutout overcurrent switching protection according to claim 1; it is characterized in that; described main fuse and auxiliary fuse are connected and fixed by mounting panel; the lower end of main fuse is provided with contact; the lower end of auxiliary fuse is provided with touch base; when electrical network normally runs; contact and touch base are in gate-dividing state; contact is beaten to main fuse side, main fuse work, auxiliary fuse upper end place in circuit; lower end is unsettled; during main fuse fault, contact invests touch base, and auxiliary fuse is connected.
4. high voltage drop-out type fuse cutout overcurrent switching protection according to claim 3, it is characterized in that, described circuits for triggering comprise the first relay, after the first relay adhesive, make contact invest touch base.
5. high voltage drop-out type fuse cutout overcurrent switching protection according to claim 1, it is characterized in that, described protective device also comprises alarm, and described alarm is in parallel with circuits for triggering.
6. high voltage drop-out type fuse cutout overcurrent switching protection according to claim 1, it is characterized in that, described protective device also comprises transformation supply module, and described low-voltage power supply module is powered to overcurrent commutation circuit.
7. high voltage drop-out type fuse cutout overcurrent switching protection according to claim 3; it is characterized in that; described touch base is connected by many prismatics screw rod with auxiliary fuse body, wherein prismatic portion height and touch base consistency of thickness, and top installs clamp nut and packing ring additional.
8. high voltage drop-out type fuse cutout overcurrent switching protection according to claim 7, is characterized in that, described many prismatics screw rod is prismatic screw rod.
9. high voltage drop-out type fuse cutout overcurrent switching protection according to claim 3; it is characterized in that; the link of described auxiliary fuse and main fuse and circuit all adopts double lead connected mode, is connected to respectively on fuse upper contact head fixed screw and binding post.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510537259.4A CN105140878B (en) | 2015-08-26 | 2015-08-26 | High voltage drop-out type fuse cutout overcurrent switching protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510537259.4A CN105140878B (en) | 2015-08-26 | 2015-08-26 | High voltage drop-out type fuse cutout overcurrent switching protection |
Publications (2)
| Publication Number | Publication Date |
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| CN105140878A true CN105140878A (en) | 2015-12-09 |
| CN105140878B CN105140878B (en) | 2018-05-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510537259.4A Expired - Fee Related CN105140878B (en) | 2015-08-26 | 2015-08-26 | High voltage drop-out type fuse cutout overcurrent switching protection |
Country Status (1)
| Country | Link |
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| CN (1) | CN105140878B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109238681A (en) * | 2018-10-17 | 2019-01-18 | 国网电力科学研究院武汉南瑞有限责任公司 | Fuse switch detection system and method |
| CN110208584A (en) * | 2019-07-10 | 2019-09-06 | 天津电力机车有限公司 | A kind of locomotive high-voltage voltage transformer fuse assembly of high stability |
| CN113258530A (en) * | 2021-06-07 | 2021-08-13 | 深圳瑞能电气设备有限公司 | AC double-electric switching device with overcurrent protection and alarm functions |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1192073A (en) * | 1997-02-18 | 1998-09-02 | 本田技研工业株式会社 | Connectore for accumulator battery of vehicle |
| CN2343700Y (en) * | 1998-08-19 | 1999-10-13 | 上海铁道学院信号设备厂 | Multifunctional fuse device |
| US20060164797A1 (en) * | 2005-01-27 | 2006-07-27 | Jacek Michael Korczynski | Switchable fused power distribution block |
| CN201523215U (en) * | 2009-08-13 | 2010-07-07 | 刘易 | Electric appliance control energy-saving protection switch |
| US20100326718A1 (en) * | 2009-06-24 | 2010-12-30 | Sumitomo Wiring Systems, Ltd. | Electrical junction box |
-
2015
- 2015-08-26 CN CN201510537259.4A patent/CN105140878B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1192073A (en) * | 1997-02-18 | 1998-09-02 | 本田技研工业株式会社 | Connectore for accumulator battery of vehicle |
| CN2343700Y (en) * | 1998-08-19 | 1999-10-13 | 上海铁道学院信号设备厂 | Multifunctional fuse device |
| US20060164797A1 (en) * | 2005-01-27 | 2006-07-27 | Jacek Michael Korczynski | Switchable fused power distribution block |
| US20100326718A1 (en) * | 2009-06-24 | 2010-12-30 | Sumitomo Wiring Systems, Ltd. | Electrical junction box |
| CN201523215U (en) * | 2009-08-13 | 2010-07-07 | 刘易 | Electric appliance control energy-saving protection switch |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109238681A (en) * | 2018-10-17 | 2019-01-18 | 国网电力科学研究院武汉南瑞有限责任公司 | Fuse switch detection system and method |
| CN110208584A (en) * | 2019-07-10 | 2019-09-06 | 天津电力机车有限公司 | A kind of locomotive high-voltage voltage transformer fuse assembly of high stability |
| CN113258530A (en) * | 2021-06-07 | 2021-08-13 | 深圳瑞能电气设备有限公司 | AC double-electric switching device with overcurrent protection and alarm functions |
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| Publication number | Publication date |
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| CN105140878B (en) | 2018-05-01 |
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Effective date of registration: 20201125 Address after: 313000 1-C, building 1, No. 656, Qixing Road, high tech Zone, Wuxing District, Huzhou City, Zhejiang Province Patentee after: Huzhou xinbeilian Network Technology Co.,Ltd. Address before: 241000 South Industry Zone, Changjiang Road, Anhui, Wuhu Patentee before: WUHU KAIXIN LIGHTNING ARRESTER Co.,Ltd. |
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Effective date of registration: 20201211 Address after: 455001 southwest corner of intersection of Zhongzhou Road and Wenyuan street, Long'an District, Anyang City, Henan Province Patentee after: STATE GRID HENAN ELECTRIC POWER COMPANY ANYANG POWER SUPPLY Co. Address before: 313000 1-C, building 1, No. 656 Qixing Road, high tech Zone, Wuxing District, Huzhou City, Zhejiang Province Patentee before: Huzhou xinbeilian Network Technology Co.,Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180501 Termination date: 20210826 |