CN207819434U - The back-up protection device and surge protecting circuit of surge protector - Google Patents
The back-up protection device and surge protecting circuit of surge protector Download PDFInfo
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- CN207819434U CN207819434U CN201721881045.XU CN201721881045U CN207819434U CN 207819434 U CN207819434 U CN 207819434U CN 201721881045 U CN201721881045 U CN 201721881045U CN 207819434 U CN207819434 U CN 207819434U
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- protection device
- surge protector
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Abstract
The utility model discloses a kind of the back-up protection device and surge protecting circuit of surge protector.The back-up protection device of surge protector includes inductance/straight wire, excess flow switch/insurance, gap.One end of the inductance/straight wire connects the one end in the gap and forms node one, the other end of the inductance/straight wire via the excess flow switch/insurance joint gap the other end and form node two.The node one connects power grid, and the node two connects surge protector.The utility model passes through application overcurrent protective device, gap and corresponding circuit; it is realized with a kind of succinct reliable way design; passing through for surge impact electric current, leakage current and failure these three electric currents of electric current is adapted to, and so that surge protector is detached from power grid when there is lasting failure electric current.
Description
Technical field
The utility model is related to surge protecting circuit field more particularly to the back-up protection devices and electricity of a kind of surge protector
Gush protection circuit.
Background technology
The electric current that surge protector may be flowed through in life cycle includes surge impact electric current, leakage current and failure electric current.
Surge impact electric current may have lightning stroke to cause, it is also possible to be caused by switching overvoltage；Leakage current is then power frequency in protection component
Existing current leakage；Failure electric current is that cause protective element to pass through in the protection reasons such as component aging larger harmful
Power current.It is provided in related installation specification, surge protector installs disconnected (molten) road device of the standby appropriate that must connect, with plan
Safety.Therefore, standby (molten) road device that breaks just must adapt to these three electric currents and pass through, and so that surge is protected when there is lasting failure electric current
It protects device and is detached from power grid.
Invention content
The purpose of this utility model is to provide the back-up protection device and surge protecting circuit of a kind of surge protector, energy
Passing through for surge impact electric current, leakage current and failure these three electric currents of electric current is adapted to, and makes surge when there is lasting failure electric current
Protector is detached from power grid.
The utility model is realized using following technical scheme：A kind of back-up protection device of surge protector comprising inductance/
Straight wire, excess flow switch/insurance, gap；One end of the inductance/straight wire connects the one end in the gap and forms node
One, the other end of the inductance/straight wire connects the other end in the gap via the excess flow switch/insurance and forms node
Two；The node one connects power grid, and the node two connects surge protector.
As being further improved for said program, the gap for the sheet metal composition that the gap is oppositely arranged using two panels.
As being further improved for said program, the gap is using between two metal tip being oppositely arranged compositions
Gap.
As being further improved for said program, the inductance value of the inductance/straight wire meets：Ul=l*di/dt, di/
Dt is the bent curvature of a curve that the electric current of the inductance/straight wire changes over time, and l is the inductance value of the inductance/straight wire, Ul
For the real-time voltage of the inductance.
As being further improved for said program, the discharge voltage in the gap meets Uj=30.0d++U0, and d is described
The clearance distance in gap, Uj are the voltage in the gap, and U0 is between 1300-1400.
As being further improved for said program, the distance in the gap is more than or equal to 1mm and is less than 2mm.
As being further improved for said program, the setting electric current of the excess flow switch/insurance is 3-20A, the inductance
Inductance value be 1.0-2.0uH.
The utility model also provides a kind of online judgment method of the back-up protection device of above-mentioned arbitrary surge protector, works as institute
When stating follow current in excess flow switch/insurance and being more than the setting value of the excess flow switch/insurance, the excess flow switch/insurance
It disconnects, so that the surge protector is detached from the power grid, be by providing back-up protection device to the detection of two voltage of the node
It is no to be online.
The utility model also provides a kind of surge protecting circuit, including surge protector and any one of the above surge protection
The back-up protection device of device, the back-up protection device connect with the surge protector and positioned at the surge protector and power grid it
Between.
As being further improved for said program, the surge protecting circuit further includes on-line checking module；It is described online
Detection module detects the voltage of the node two, and judges whether the back-up protection device is according to the voltage of the node two
Presence.
The back-up protection device of the surge protector of the utility model is by applying overcurrent protective device (i.e. excess flow switch/guarantor
Nearly), gap and corresponding circuit are realized with a kind of succinct reliable way design.
Description of the drawings
Fig. 1 is the circuit diagram of the back-up protection device of the surge protector of the utility model.
Fig. 2 is a kind of structural schematic diagram in gap in Fig. 1.
Fig. 3 is the structural schematic diagram in another gap in Fig. 1.
Specific implementation mode
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only explaining this
Utility model is not used to limit the utility model.
Referring to Fig. 1, the back-up protection device of the surge protector of the present embodiment include inductance L, excess flow switch/insurance A,
Clearance G.Signified excess flow switch/insurance A refers to that A can be with for excess flow switch, or insurance.Between one end connection of inductance L
One end of gap G simultaneously forms the other end and formation of the other end of node one a, inductance L via excess flow switch/insurance A joint gaps G
Two b of node.One a connection power grids of node, two b connection surge protectors SPD of node.
When surge protector SPD installations, the back-up protection device (in Fig. 1 in dotted line frame) of the utility model of connecting：
1. when that surge does not occur, clearance G is off, surge protector SPD and inductance L, excess flow switch/insurance
A forms series circuit, and when surge protector SPD fails, the follow current I of excess flow switch/insurance A is more than excess flow switch/guarantor
When the setting value of dangerous A, excess flow switch/insurance A is disconnected, and so that surge protector SPD is detached from power grid, is passed through the voltage to two b of node
Detection provides whether back-up protection device is online.This is also the back-up protection device of the surge protector of the utility model
Online judgment method.
2. surge occurs, in the forward position that surge voltage rises, clearance G is off, zooming surge electricity
Stream makes inductance L induction reactance voltage superposition surge voltages, and clearance G is made to be rapidly achieved conducting voltage.
After clearance G conducting, surge current flows to surge protector SPD by clearance G, then flows into the earth.
After surge, due to the cut-off state that is restored to of surge protector SPD, clearance G is extinguished.
It should be noted that：
1. the matching of the conducting voltage of clearance G, turn-on time and inductance L
The back-up protection device of the utility model is suitble to realize that all device installations, clearance G are direct in the space 1P (18MM)
The sheet metal being oppositely arranged using two panels constitutes (as shown in Figure 2) or two metal tips being oppositely arranged are constituted (such as Fig. 3 institutes
Show), (distance d's discharge voltage of clearance G) is matched by the effect with inductance L.
Various surge impact wave effects are considered, by formula (A)：Ul=l*di/dt and formula (B) Uj=30d+U0 is determined
The inductance value l and clearance G discharge voltage of inductance L.Di/dt is the bent curvature of a curve that the electric current of inductance L changes over time, and l is electricity
Feeling the inductance value of L, Ul is the real-time voltage of inductance L, and d is the clearance distance of clearance G, and Uj is the voltage of clearance G, and U0 is constant,
Between 1300-1400V, it is therefore preferable to 1350V.Clearance distance d is preferably greater than or equal to 1mm and is less than 2mm, d<When 2mm,
Stand-off distance from the linear variation of discharge voltage.
When being considered as minimum surge impact electric current when design, dash current is passed through by excess flow switch/insurance A, and due to electricity
Feel L effects, the influence of the level of protection of integral protection structure, inductance L should take small as far as possible.Inductance L=1- in this programme example
2uH。
2. the impact tolerance of excess flow switch/insurance A
Using specified surge impact as object of experiment, calculate what excess flow switch/insurance A should be born before clearance G conducting
Impact capacity.
By taking 8/20us dash currents 100KA as an example：The shock wave front time is 8us, i.e., rises in 8us time dash currents
To 100KA*0.9=90KA, consider that the air gap turn-on time and dash current rise time, excess flow switch/insurance A should have
800ns-1000ns's bears the time, and dash current has been raised to about 12KA, therefore excess flow switch/insurance A at this time, is designed into
The tolerance that can bear 1us*15KA, ensure lightening pulse by when, excess flow switch/insurance A is failure to actuate.
Above-described embodiment is that the utility model part is realized, according to the principles of the present invention, by testing and calculating,
It can be designed that the surge protector back-up protection device of suitable different demands, wherein excess flow switch/insurance A, inductance L, clearance gap
It can be obtained according to above-mentioned Experiment of Principle and calculating from shape.Inductance L can be replaced when space is permitted with straight wire.
In order to preferably verify the beneficial effects of the utility model, the utility model has done 7 groups of experiments as example, respectively
It is as follows.
Example 1：It is resistant to the back-up protection device of 20KA impacts.
Excess flow switch/insurance A=3A, clearance G distance d=1mm, inductance L=1.0uH.
Example 2：It is resistant to the back-up protection device of 40KA impacts.
Excess flow switch/insurance A=5A, clearance G distance d=1mm, inductance L=1.0uH.
Example 3：It is resistant to the back-up protection device of 60KA impacts.
Excess flow switch/insurance A=8A, clearance G distance d=1.2mm, inductance L=1.0uH.
Example 4：It is resistant to the back-up protection device of 80KA impacts.
Excess flow switch/insurance A=10A, clearance G distance d=1mm, inductance L=1.5uH.
Example 5：It is resistant to the back-up protection device of 100KA impacts.
Excess flow switch/insurance A=10A, clearance G distance d=1.2mm, inductance L=1.5uH.
Example 6：It is resistant to the back-up protection device of 120KA impacts.
Excess flow switch/insurance A=15A, clearance G distance d=1.5mm, inductance L=2.0uH.
Example 7：It is resistant to the back-up protection device of 160KA impacts.
Excess flow switch/insurance A=20A, clearance G distance d=1.5mm, inductance L=2uH.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
All any modification, equivalent and improvement etc., should be included in the utility model made by within the spirit and principle of utility model
Protection domain within.
Claims (9)
1. a kind of back-up protection device of surge protector, it is characterised in that：It include inductance/straight wire, excess flow switch/insurance,
Gap；One end of the inductance/straight wire connects the one end in the gap and forms node one, the inductance/straight wire it is another
One end connects the other end in the gap via the excess flow switch/insurance and forms node two；The node one connects power grid,
The node two connects surge protector.
2. the back-up protection device of surge protector as described in claim 1, it is characterised in that：The gap is opposite using two panels
The gap that the sheet metal of setting is constituted.
3. the back-up protection device of surge protector as described in claim 1, it is characterised in that：The gap is opposite using two
The gap that the metal tip of setting is constituted.
4. the back-up protection device of surge protector as described in claim 1, it is characterised in that：The electricity of the inductance/straight wire
Sensibility reciprocal meets：Ul=l*di/dt, di/dt are the bent curvature of a curve that the electric current of the inductance/straight wire changes over time, and l is institute
The inductance value of inductance/straight wire is stated, Ul is the real-time voltage of the inductance.
5. the back-up protection device of surge protector as described in claim 1, it is characterised in that：The discharge voltage in the gap is full
Sufficient Uj=30.0d+U0, d are the clearance distance in the gap, and Uj is the voltage in the gap, and U0 is between 1300-1400V.
6. the back-up protection device of surge protector as described in claim 1, it is characterised in that：The distance in the gap be more than etc.
In 1mm and it is less than 2mm.
7. the back-up protection device of surge protector as described in claim 1, it is characterised in that：Excess flow switch/the insurance
Setting electric current is 3-20A, and the inductance value of the inductance is 1.0-2.0uH.
8. a kind of surge protecting circuit, it is characterised in that：Including surge protector and such as any one of claim 1 to 7 institute
The back-up protection device for the surge protector stated, the back-up protection device are connected with the surge protector and are protected positioned at the surge
It protects between device and power grid.
9. surge protecting circuit as claimed in claim 8, it is characterised in that：The surge protecting circuit further includes on-line checking
Module；The on-line checking module detects the voltage of the node two, and judges the standby according to the voltage of the node two
Whether protector is online.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721881045.XU CN207819434U (en) | 2017-12-28 | 2017-12-28 | The back-up protection device and surge protecting circuit of surge protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721881045.XU CN207819434U (en) | 2017-12-28 | 2017-12-28 | The back-up protection device and surge protecting circuit of surge protector |
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| Publication Number | Publication Date |
|---|---|
| CN207819434U true CN207819434U (en) | 2018-09-04 |
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ID=63328023
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| CN201721881045.XU Active CN207819434U (en) | 2017-12-28 | 2017-12-28 | The back-up protection device and surge protecting circuit of surge protector |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108039699A (en) * | 2017-12-28 | 2018-05-15 | 广东立信防雷科技有限公司 | Back-up protection device and its online determination methods and surge protecting circuit |
-
2017
- 2017-12-28 CN CN201721881045.XU patent/CN207819434U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108039699A (en) * | 2017-12-28 | 2018-05-15 | 广东立信防雷科技有限公司 | Back-up protection device and its online determination methods and surge protecting circuit |
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