CN204391703U - A kind of Novel electric surge protector - Google Patents

Abstract

The utility model relates to a kind of Novel electric surge protector, comprise lightning protection component, overcurrent protective device, thermel protection device and shell, described lightning protection component and overcurrent protective device series connection, form surge and to release path, described thermel protection device is positioned on lightning protection component electrode; This Novel electric surge protector also comprises current sensor, flow restricter, buffer displacement shell fragment, inertial device, electromagnetism actuating mechanism, link gear, normally opened contact; Described current sensor is sleeved on surge and releases on path, and is connected with electromagnetism actuating mechanism; Described electromagnetism action mechanism controls buffer displacement shell fragment motion; Described buffer displacement shell fragment is connected with inertial device; Described inertial device controls normally opened contact action through link gear; Described normally opened contact and flow restricter are composed in series bypass, and bypass is connected in parallel on lightning protection component two ends.This Novel electric surge protector solves the action blind zone problem of existing thermel protection device and overcurrent protective device at all.

Description

A kind of Novel electric surge protector

Technical field

The utility model 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 protector.Surge protector has been widely used in various field, has important effect in lightning protection.The quality of its state then directly affects its lightning protection effect, thus brings hidden danger to the safety of institute's proterctive equipment.

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 lightning protection component deterioration heating; overcurrent protective device is used for the lightning protection component puncture short preventing transient over-current or overvoltage from causing; simultaneously overcurrent protection as a kind of backup protection mode of Thermal protection, so effective protective action can be played in most of occasion.

But because heat transfer is a relatively slow process, the sensitivity of thermel protection device is low, still effective protection can be played for slow temperature-rise period, but for low (in) steep temperature rise situation owing to causing under sustained over voltage condition in pressing system, Thermal protection trip gear can not this process of perception in time and action does not occur, cause lightning protection component breakdown, power current enters SPD circuit, when this power frequency electric flow valuve does not reach the initiation value of overcurrent protective device, also can not there is action in overcurrent protective device, thus cause SPD on fire; If the initiation value of overcurrent protective device is selected little, though can start, be difficult to resist the impact of lightning current, cause SPD cannot normally to release lightning current.

In sum; there is serious action blind area in the overcurrent protective device of existing SPD and thermel protection device; SPD is by when the electric current in this region, and the SPD that thermel protection device and overcurrent protective device all can not be about to damage departs from main circuit, thus occurs serious potential safety hazard.

Utility model content

In order to effectively solve the above prior-art problems, the utility model proposes a kind of easy for installation and Novel electric surge protector for power-supply system of dependable performance, the basic action blind zone problem solving existing thermel protection device and overcurrent protective device.

The utility model is by the following technical solutions: the utility model is for the surge protector in power electronic circuits system, this surge protector comprises lightning protection component, overcurrent protective device, thermel protection device and shell, described lightning protection component and overcurrent protective device series connection, form surge to release path, described thermel protection device is positioned on lightning protection component electrode, it is characterized in that: this Novel electric surge protector also comprises current sensor, flow restricter, buffer displacement shell fragment, inertial device, electromagnetism actuating mechanism, link gear, normally opened contact; Described current sensor is sleeved on surge and releases on path, and is connected with electromagnetism actuating mechanism; Described electromagnetism action mechanism controls buffer displacement shell fragment motion; Described buffer displacement shell fragment is connected with inertial device; Described inertial device controls normally opened contact action through link gear; Described normally opened contact and flow restricter are composed in series bypass, and bypass is connected in parallel on lightning protection component two ends.

After described normally opened contact is closed, can not open before overcurrent protective device disconnects, also it has reset switch to described normally opened contact again.Described lightning protection component, comprises piezo-resistance, discharge tube, TVS one or a combination set of; Described overcurrent protective device can be fuse or circuit breaker; The circuit that described flow restricter can be one of electronic devices such as resistance, inductance, electric capacity or be combined by it, has the effect of Limited Current; Described inertial device is flying wheel or weight or damping gear or air valve or delay circuit, just can move when the power continued.

Described current sensor can respond to the electric current that surge is released on path, thus makes the electromagnetism action mechanism action that is attached thereto.According to the parameter such as size, direction, rate of change, duration different of lightning surge and power current, the electric current also corresponding difference of electromagnetism actuating mechanism exported to by current sensor, and thus the duration of electromagnetism actuating mechanism generation action is also different.Only have when power frequency short circuit current flow continuously through surge release path time, the input induced current that current sensor continues to electromagnetism actuating mechanism, thus the push rod of electromagnetism actuating mechanism continues to promote inertia displacement shell fragment, causes inertial device to move; Lightning surge is exceedingly fast due to time of origin, and the push rod of electromagnetism actuating mechanism only ejects instantaneously and sets back, and inertial device can not be driven due to its effect of inertia.

The working method of this Novel electric surge protector: when lightning current flows through lightning protection component, time is very short, electric current is released rapidly, electromagnetism actuating mechanism push rod ejects rapidly and recovers, inertial device keeps motionless state due to effect of inertia, link gear can not be driven to close bypass normally opened contact, thus guarantee that lightning current is released smoothly, when lightning protection component deterioration power frequency leakage current reaches certain value, lightning protection component shell temperature also rises to certain altitude, and the intensification caused due to power frequency leakage current is the process of a slow gradual change, and thermel protection device will start, and disconnect at lightning protection component electrode place, when the power current that power system failure or other reasons cause flows through lightning protection component, electromagnetism actuating mechanism makes push rod continue to eject under the effect of electromagnetic force, push rod promotes buffer displacement shell fragment, inertial device can not rotate along buffer displacement shell fragment force direction due to effect of inertia, but now short circuit current does not disappear, electromagnetism actuating mechanism push rod still heads on buffer displacement shell fragment, after waiting for time delay Millisecond Δ t, inertial device rotates counterclockwise rapidly, link gear is driven to close bypass normally opened contact, the bypass being now connected in parallel on lightning protection component two ends is switched on, power frequency short circuit current will without lightning protection component, directly arrive overcurrent protective device by bypass, and have time enough to disconnect by overcurrent protective device, thus the lightning protection component being about to damage is departed from from main circuit.

Of the present utility modelly to be characterised in that:

1. this Novel electric surge protector is by increasing the bypass being connected in parallel on lightning protection component two ends, solves the action blind zone problem of thermel protection device and overcurrent protective device.Bypass is composed in series by normally opened contact and flow plug, normally opened contact controls through link gear, inertial device, buffer displacement shell fragment, buffer displacement shell fragment is by electromagnetism action mechanism controls, and the current sensor being sleeved on surge and releasing on path is depended in the action of electromagnetism actuating mechanism.

2. the lightning protection component of this Novel electric surge protector and current sensor, overcurrent protective device, thermel protection device, flow restricter, buffer displacement shell fragment, inertial device, electromagnetism actuating mechanism, link gear, normally opened contact accessible site are in one; be loaded on housing; meet the requirement of power consumption equipment to surge protector discharge capacity, response time and voltage protection level three indexs; enhance the reliability of equipment; also can be installed on different housings or be encapsulated in different modules and combine, be convenient to install and use.

3. this Novel electric surge protector can not have overcurrent protective device.

Accompanying drawing explanation

Fig. 1 is the first example structure schematic diagram of the present utility model.

Fig. 2 is the first embodiment principle schematic of the present utility model.

Fig. 3 is the second embodiment principle schematic of the present utility model.

Fig. 4 is the 3rd embodiment principle schematic of the present utility model.

Fig. 5 is the utility model protected effect schematic diagram.

Specific embodiments

Below in conjunction with drawings and Examples, the utility model is further illustrated:

As shown in the figure, 0 is push rod, and 1 is the first terminals; 2 is normally opened contacts, and 3 is bypasses, and 4 is flow plugs; 5 is second terminals, and 6 is overcurrent protective devices, and 7 is lightning protection components; 8 is buffer displacement shell fragments, and 9 is inertial devices, and 10 is thermel protection devices; 11 is current sensors, and 12 is electromagnetism actuating mechanisms, and 13 is that surge is released path; 14 is shells, and 15 is link gears, and 16 is reset switches.

Fig. 1 is the first example structure schematic diagram of the present utility model, and solid black lines is that surge is released path (13), is composed in series by lightning protection component (7) and overcurrent protective device (6); Streak line is bypass (3), and be composed in series by normally opened contact (2) and flow plug (4), described bypass (3) is connected in parallel on lightning protection component (7) two ends; Described thermel protection device (10) is positioned on lightning protection component (7) electrode.Described current sensor (11) is sleeved on surge and releases on path (13), and is connected with electromagnetism actuating mechanism (12); The push rod (0) of described electromagnetism actuating mechanism (12) can promote buffer displacement shell fragment (8); Described buffer displacement shell fragment (8) is connected with inertial device (9); Normally opened contact (2) action is controlled through link gear (15) after described inertial device (9) rotates.Originally be inertial device in embodiment (9) be flying wheel.The power that flying wheel is only continued just can be rotated, namely the instantaneous ejection of push rod (0) that lightning surge causes is regained and can not be promoted flying wheel rotation, the push rod (0) that lasting power current causes continues ejection just can promote flying wheel rotation, thus drives the closed normally opened contact (2) of link gear (15).Described normally opened contact has reset switch (16) (this signal is not shown in FIG.).

Fig. 2 is principle schematic corresponding to Fig. 1 first embodiment, wherein inertia displacement shell fragment (8) and link gear (15) represented by dashed line, reset switch (16) can control inertial device (9) makes normally opened contact (2) recover normally open.

Fig. 3 is this Novel electric surge protector second embodiment principle schematic, overcurrent protective device (6) is not had in the surge protector of this embodiment, only comprise surge to release path (13), bypass (3) and current sensor (11), thermel protection device (10), electromagnetism actuating mechanism (12), elastic displacement shell fragment (8), inertial device (9), link gear (15), reset switch (16), wherein inertia displacement shell fragment (8) and link gear (15) represented by dashed line, reset switch (16) can control inertial device (9) makes normally opened contact (2) recover normally open.Because surge protector in use; if inside does not have built-in overcurrent protective device; so rear end must be connected in series overcurrent protective device; therefore the Novel electric surge protector that describes of the present embodiment have power current by time can allow the timely action of its external overcurrent protective device, thus surge protector is departed from main circuit.

Fig. 4 is this Novel electric surge protector the 3rd embodiment principle schematic; in this real trip example, current sensor (11) and overcurrent protective device (6) are positioned at another one housing; wherein inertia displacement shell fragment (8) and link gear (15) represented by dashed line, reset switch (16) can control inertial device (9) makes normally opened contact (2) recover normally open.

Fig. 1, Fig. 2 are lightning protection components (7) with current sensor (11), overcurrent protective device (6), thermel protection device (10), flow restricter (4), buffer displacement shell fragment (8), inertial device (9), electromagnetism actuating mechanism (12), link gear (15), normally opened contact (2), reset switch (16) accessible site in the embodiment of one; Fig. 3, Fig. 4 are that lightning protection component (7) also can be installed on different housings from current sensor (11), overcurrent protective device (6), thermel protection device (10), flow restricter (4), buffer displacement shell fragment (8), inertial device (9), electromagnetism actuating mechanism (12), link gear (15), normally opened contact (2), reset switch (16) or be encapsulated in the embodiment combined in different modules.

Fig. 5 is the utility model protected effect schematic diagram, 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 action blind area of existing surge protector protective device, be called for short action blind area.

Utilize the technical solution of the utility model, reach corresponding technique effect, or not departing from the technical scheme equivalents under design philosophy of the present utility model, all within protection range of the present utility model.

Claims (9)

1. a Novel electric surge protector, comprise lightning protection component, overcurrent protective device, thermel protection device and shell, described lightning protection component and overcurrent protective device series connection, form surge to release path, described thermel protection device is positioned on lightning protection component electrode, it is characterized in that: this Novel electric surge protector also comprises current sensor, flow restricter, buffer displacement shell fragment, inertial device, electromagnetism actuating mechanism, link gear, normally opened contact; Described current sensor is sleeved on surge and releases on path, and is connected with electromagnetism actuating mechanism; Described electromagnetism action mechanism controls buffer displacement shell fragment motion; Described buffer displacement shell fragment is connected with inertial device; Described inertial device controls normally opened contact action through link gear; Described normally opened contact and flow restricter are composed in series bypass, and bypass is connected in parallel on lightning protection component two ends.

2. a kind of Novel electric surge protector according to claim 1, is characterized in that: this Novel electric surge protector can not have overcurrent protective device.

3. a kind of Novel electric surge protector according to claim 1 and 2, is characterized in that: after described normally opened contact is closed, can not open before overcurrent protective device disconnects again.

4. a kind of Novel electric surge protector according to claim 1 and 2, is characterized in that: described normally opened contact has reset switch.

5. a kind of Novel electric surge protector according to claim 1 and 2, is characterized in that: described inertial device is flying wheel or weight or damping gear or air valve or delay circuit.

6. a kind of Novel electric surge protector according to claim 1 and 2; it is characterized in that: described lightning protection component and current sensor, overcurrent protective device, thermel protection device, flow restricter, buffer displacement shell fragment, inertial device, electromagnetism actuating mechanism, link gear, normally opened contact can be positioned at same housing, also can be installed on different housings or be encapsulated in different modules and combine.

7. a kind of Novel electric surge protector according to claim 1 and 2, is characterized in that: the circuit that described flow restricter can be one of resistance, inductance, electric capacity or be combined by it.

8. a kind of Novel electric surge protector according to claim 1 and 2, is characterized in that: described overcurrent protective device can be fuse or circuit breaker.

9. a kind of Novel electric surge protector according to claim 1 and 2, is characterized in that: described lightning protection component can be piezo-resistance, discharge tube, TVS one or a combination set of.