CN204144932U - A kind of novel surge protection device - Google Patents
A kind of novel surge protection device Download PDFInfo
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- CN204144932U CN204144932U CN201420377917.9U CN201420377917U CN204144932U CN 204144932 U CN204144932 U CN 204144932U CN 201420377917 U CN201420377917 U CN 201420377917U CN 204144932 U CN204144932 U CN 204144932U
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- surge
- lightning protection
- protective device
- relay
- protection component
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- 230000001681 protective effect Effects 0.000 claims abstract description 42
- 238000010586 diagram Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
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- 230000008447 perception Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
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Abstract
The utility model relates to a kind of novel surge protection device, mainly comprise lightning protection component, current sensor, relay, thermel protection device, overcurrent protective device, flow restricter and shell, described lightning protection component is connected with overcurrent protective device, forms surge path; Described thermel protection device is positioned on lightning protection component electrode; Current sensor is sleeved on surge path, is connected with relay; Relay normally open contact is parallel to lightning protection component both sides after connecting with flow restricter.The utility model current sensor can sense the power current flowing through lightning protection component, and relay normally open contact is closed, and power current flows through overcurrent protective device, and overcurrent protective device is disconnected.The utility model effectively solves the protection blind zone problem of protective device to power current of existing surge protective device.
Description
Technical field
The invention belongs to the surge protection technical field of electronic electric equipment.
Background technology
Thunder and lightning aloft to be discharged a kind of special weather phenomenon caused by charged cloud.Thunder and lightning is the major reason causing electronic equipment to damage, and it threatens the safe and stable operation of the every field electronic informations such as building, railway, civil aviaton, communication, industry control, military affairs.It is one of important measures of lightning protection that the metallic circuits such as the power line be connected with electronic equipment, holding wire and control line install surge protection device.Surge protection device has been widely used in various field, has important effect in lightning protection.The quality of its state not only directly affects its lightning protection effect, and owing to generating heat and burn when it damages, can cause secondary disaster.
Present stage SPD has Thermal protection and overcurrent protection (internal or external) two kinds of protective devices in use usually.Thermel protection device is used for protecting power current and flows through the heating that lightning protection component causes and damage, and overcurrent protective device is used for preventing lightning protection component puncture short.But there is protection blind area to power current in existing SPD protective device; so-called protection blind area is exactly when occurring that the power current of a certain scope flows through lightning protection component; because temperature rise is too fast or caloric value is not enough; Thermal protection trip gear can not this process of perception in time and can not complete de-mouth action in time; overcurrent protective device is then also failure to actuate because not reaching entry condition; at this moment, larger power current flows continuously through lightning protection component and causes on fire.
Summary of the invention
In order to effectively solve the protection blind zone problem of existing protective device to SPD, the present invention proposes a kind of safe and reliable novel surge protection device for power-supply system.The present invention installs a current sensor on surge path; current sensor can sense the power current of more than the certain value flowing through lightning protection component; and relay normally open contact is closed; at this moment will be risen rapidly by the electric current of overcurrent protective device; overcurrent protective device disconnects rapidly, thus has cut off the power current in lightning protection component loop.
The present invention is by the following technical solutions: the present invention is applicable to the surge protection device in electric power system, described surge protection device mainly comprises lightning protection component, current sensor, relay, thermel protection device, overcurrent protective device, flow restricter and shell, described lightning protection component is connected with overcurrent protective device, forms surge path; Described thermel protection device is positioned at lightning protection component electrode pin place; Current sensor is sleeved on surge path or is installed near surge path, is connected with relay control circuit; Relay normally open contact and flow restricter bypass in series are parallel to lightning protection component both sides; Described relay control circuit can control normally opened contact and close.
Described lightning protection component, comprises piezo-resistance, discharge tube, TVS one or a combination set of; Described relay can be one, also can be two or more relay cascades composition.Because mounting condition is different; described lightning protection component, current sensor, relay, thermel protection device, overcurrent protective device, flow restricter; a housing can be installed on, also can be installed on different housings, common formation novel surge protective device of the present invention.
The invention is characterized in:
1. this novel surge protection device solves SPD protective device exists protection blind area problem to power current, the power current in gamut protection SPD loop; The less power current that can produce harm flowing through lightning protection component is protected by thermel protection device; Protection blind area scope power current causes overcurrent protective device by relay bypass of the present invention and protects; Larger power current is directly protected by overcurrent protective device.
2. when surge current flows through during lightning protection component, normally opened contact can not close, thus ensures normally to release surge current; And when the power current flowing through lightning protection component is in protection blind area scope, or a little less than protection blind area scope, or higher than protection blind area scope, current sensor will induce enough current values makes relay normally open contact close conducting.The current range of current sensor induction comprises and slightly larger than protection blind area scope.
3. relay normally open contact is after closing, and no longer opened before overcurrent protective device disconnects, the Position Design of normally opened contact is in bypass; can not by large lightning surge; and contact action is single, only need become closed from normally open, simple to the designing requirement of contact.
4. relay can be one, also can be two or more relay cascades composition.
Accompanying drawing explanation
Fig. 1 is first embodiment of the present invention structural principle schematic diagram.
Fig. 2 is second embodiment of the present invention structural principle schematic diagram.
Fig. 3 is third embodiment of the present invention structural principle schematic diagram.
Fig. 4 is fourth embodiment of the present invention structural principle schematic diagram.
Fig. 5 is protected effect schematic diagram of the present invention.
Wherein: 1-surge path, 2-current sensor, 3-lightning protection component; 4-overcurrent protective device, 5-relay, 5 '-relay 1; 6-normally opened contact, 6 '-normally opened contact 1,7-flow restricter; 7 '-flow restricter 1,8-bypass, 8 '-bypass 1; 9-shell, 10-thermel protection device, another shell of 11-; L-power inleting terminal, N (PE)-ground wire (or zero line).
Embodiment
Below in conjunction with drawings and Examples, the present invention is further described:
Fig. 1 is first embodiment of the invention structural principle schematic diagram.Surge path (1) power source end of incoming cables L first connects lightning protection component (3), then connects overcurrent protective device (4), and current sensor (2) is positioned on lightning protection component (3) loop.The bypass (8) that normally opened contact (6) and flow restricter (7) are formed is connected in parallel on lightning protection component (3) end opening and power inleting terminal.
Fig. 2 is second embodiment of the invention structural principle schematic diagram.Surge path (1) power source end of incoming cables L first connects overcurrent protective device (4), then connects lightning protection component (3), and current sensor (2) is positioned at overcurrent protective device (4) front end.The bypass (8) that normally opened contact (6) and flow restricter (7) are formed is connected in parallel on the suitable for reading and ground wire (or zero line) of lightning protection component (3) and holds.Described overcurrent protective device (4) and current sensor (2) are placed in another shell (11), by connecting with shell (9), together constitute the novel surge protection device of the present invention.
The normally opened contact (6) of the first embodiment and the second embodiment controls by relay (5) control loop, and will be retained to overcurrent protective device disconnection after closing.
Fig. 3 is third embodiment of the invention structural principle schematic diagram.Described overcurrent protective device (4) is placed in the outside of surge protection device shell (9), and this situation surge protection device of the present invention does not comprise overcurrent protective device (4).
Fig. 4 is fourth embodiment of the invention structural principle schematic diagram.Surge path (1) power source end of incoming cables L first connects lightning protection component (3), then connects overcurrent protective device (4), and current sensor (2) is positioned on lightning protection component (3) loop.The bypass (8) that normally opened contact (6), relay 1 (5 ') control loop and flow restricter (7) are formed is connected in parallel on lightning protection component (3) end opening and power inleting terminal, the bypass 1 (8 ') that normally opened contact 1 (6 ') and flow restricter 1 (7 ') are formed also is connected in parallel on lightning protection component (3) end opening and power inleting terminal, relay 5 and relay 1 (5 ') cascade.
Fig. 4 repeat circuit (5) and relay 1 (5 ') lay respectively in bypass (8) and bypass 1 (8 '), two relays carry out cascade Mach-Zehnder interferometer: when power current is in protection blind area scope, or a little less than protection blind area scope, or higher than protection blind area scope, current sensor (2) will induce enough current values makes relay (5) normally opened contact (6) close conducting, and this process repeat circuit (5) is controlled by the induced current from current sensor (2); Bypass (8) conducting after normally opened contact (6) is closed, the power current of power inleting terminal will flow into relay 1 (5 '), make normally opened contact 1 (6 ') close conducting, this process repeat circuit (5 ') is controlled by the power current from power inleting terminal; Bypass 1 (8 ') conducting after normally opened contact 1 (6 ') is closed.
The present invention can also be that multiple relay cascade controls, and repeats no more herein.
Fig. 5 is protected effect schematic diagram of the present invention, power frequency short circuit current is divided into three parts: little power current refers to the current range that thermel protection device can start; Large power frequency short circuit current refers to the current range that overcurrent protective device can start; Marginal, be the power frequency short circuit current protection blind area of existing surge protection device protective device, be called for short protection blind area.
Use method of the present invention; composition graphs 1, Fig. 2, Fig. 3, Fig. 4 embodiment; current sensor (2) can induce the current value comprised within the scope of protection blind area; thus relay normally open contact (6) is closed; connect bypass (8); now power frequency short circuit current will flow through overcurrent protective device (4) by bypass (8); power current in bypass (8) is by large for instantaneous change; make overcurrent protective device (4) action, thus solve protection blind zone problem.The current range that described current sensor (2) is responded to comprises and is greater than protection blind area scope, thus ensures that the present invention can gamut stop power current to the damage of SPD itself.
Utilize technical scheme of the present invention, reach corresponding technique effect, or not departing from the technical scheme equivalents under design philosophy of the present invention, all within protection scope of the present invention.
Claims (10)
1. a novel surge protection device, is characterized in that: surge protection device comprises lightning protection component, current sensor, relay, thermel protection device, overcurrent protective device, flow restricter and shell; Described lightning protection component is connected with overcurrent protective device, forms surge path; Described thermel protection device is positioned on lightning protection component electrode; Current sensor is sleeved on surge path, is connected with Control pole; Relay normally open contact and flow restricter bypass in series are parallel to lightning protection component both sides.
2. the novel surge protection device of one according to claim 1, is characterized in that: the Position Design of described normally opened contact in bypass, and after closing, can not be opened before overcurrent protective device disconnects again.
3. the novel surge protection device of one according to claim 1, is characterized in that: described current sensor can not trigger relay action when surge current flows through surge path, does not affect the normal guard of lightning protection component to line surge; Current sensor is responded to and the current range of the actuating of relay is comprised and is greater than the Thermal protection of lightning protection component and the protection blind area scope of overcurrent protection.
4. the novel surge protection device of one according to claim 1, is characterized in that: described relay can be one, also can be two or more relay cascades composition.
5. the novel surge protection device of one according to claim 1, is characterized in that: described power supply phase line first connects lightning protection component, then connects overcurrent protective device, and the bypass that normally opened contact and flow restricter are formed is connected in parallel on lightning protection component end opening and power inleting terminal.
6. the novel surge protection device of one according to claim 1, is characterized in that: described power supply phase line first connects overcurrent protective device, then connects lightning protection component, and the bypass that normally opened contact and flow restricter are formed is connected in parallel on lightning protection component suitable for reading and ground wire or zero line side.
7. the novel surge protection device of one according to claim 1, is characterized in that: described overcurrent protective device can be positioned at the outside of shell.
8. the novel surge protection device of one according to claim 1; it is characterized in that: lightning protection component, current sensor, relay, thermel protection device, overcurrent protective device, flow restricter; a housing can be installed on, also can be installed on different housings and jointly form novel surge protective device of the present invention.
9. the novel surge protection device of one according to claim 1, is characterized in that: the circuit that described flow restricter can be one of electronic devices such as resistance, inductance, electric capacity or be combined by it.
10. the novel surge protection device of one according to claim 1, is characterized in that: described lightning protection component can be electronic devices such as piezo-resistance, discharge tube, TVS one or a combination set of.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420377917.9U CN204144932U (en) | 2014-07-07 | 2014-07-07 | A kind of novel surge protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420377917.9U CN204144932U (en) | 2014-07-07 | 2014-07-07 | A kind of novel surge protection device |
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| Publication Number | Publication Date |
|---|---|
| CN204144932U true CN204144932U (en) | 2015-02-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420377917.9U Expired - Lifetime CN204144932U (en) | 2014-07-07 | 2014-07-07 | A kind of novel surge protection device |
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| Country | Link |
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| CN (1) | CN204144932U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104810811A (en) * | 2015-05-14 | 2015-07-29 | 安徽省宁国市天成电气有限公司 | Staged protection structure for heating wire |
| CN105322523A (en) * | 2014-07-07 | 2016-02-10 | 孙麓轩 | Novel surge protection device |
-
2014
- 2014-07-07 CN CN201420377917.9U patent/CN204144932U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105322523A (en) * | 2014-07-07 | 2016-02-10 | 孙麓轩 | Novel surge protection device |
| CN104810811A (en) * | 2015-05-14 | 2015-07-29 | 安徽省宁国市天成电气有限公司 | Staged protection structure for heating wire |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20150204 |