A kind of Novel lightning arrester that shows overvoltage and thunderbolt
The utility model relates to a kind of Novel lightning arrester that shows overvoltage and thunderbolt.
Thunder and lightning is natural a kind of spontaneous phenomenon, is the process that energy discharges again after gathering for a long time within the utmost point short time.Damage to crops caused by thunder is divided into direct lightning strike and induction thunder, direct lightning strike comprises to be attacked directly in various artificial buildingss, on nature body, or walk around some barrier and hit the object after barrier, induction thunder refers to the thunderbolt that thunderbolt produces induced overvoltage to the earth on other objects, even if buildings itself does not suffer from direct thunderbolt, but the lightning strike on side also likely causes this buildings to cause superpotential, this superpotential can directly or indirectly arrive above electronic installation by inductive or capacitive couplings, and part lightning current may be sent to earthing device by ground, so very easily cause very large harm, in addition, the conversion operations of the closed and disconnected of circuit, the blocking-up that short-circuit current causes, the switching manipulation of perception or capacitive load etc. causes superpotential, superpotential causes damage in various degree to electronic equipment, many units, family all suffers threat and the invasion and attack of thunder and lightning, make people progressively recognize the importance of lightning protection, thunder resisting equipment is installed, satisfactory lightning rod (band) is installed on buildings, can more effectively prevent the infringement of direct lightning strike, in power distribution circuit, the normal lightning arrester of installing has: valve-type arrester, tube type arrester, Zinc-Oxide Arrester etc., low-voltage distribution system is advocated and is selected low-voltage ZnO lightning arrester, these all lightning protections are after suffering damage, for the source of damage, parts etc. be can not determine, can not take in time maintenance measure, can only investigate one by one, after investigating out, just can keep in repair targetedly, remedy and protect, give like this people's life, work brings very big inconvenience.
Summary of the invention
The purpose of this utility model is to overcome the problem that prior art exists, a kind of Novel lightning arrester that shows overvoltage and thunderbolt is provided, not only simple in structure, and can avoid buildings, electric power facility etc. after suffering damage, blindly to take unaccommodated maintenance measure, lose time, make troubles to people's life, work.
For achieving the above object, the technical solution of the utility model is:
A kind of Novel lightning arrester that shows overvoltage and thunderbolt, comprise that ATMEGA128-AU is main control circuit part, discharge loop, the measurement current circuit of core, RS485 telecommunication circuit, current collection circuit, buzzer alarm circuit, described discharge loop forms by certainly recovering insurance, current transformer, voltage dependent resistor (VDR) and discharge tube; Described measurement display section is by Hall current sensor, switch power module, single-chip microcomputer, hummer and LCDs composition, its special character is: this lightning arrester is by mutual inductor TA1016-2M sensor current signal, output to and measure current circuit and the testing circuit that consists of LM358 is measured electric current, this metering circuit outputs to the AD0 mouth of single-chip microcomputer, after single-chip microcomputer sampling, can show normal, overvoltage, thunderbolt state by LCD12864 LCDs.
Further, described lightning arrester adopts current transformer induction current, to judge that overvoltage is still struck by lightning.
Further, described lightning arrester adopts from recovering insurance, when thunderbolt is later from recovering, without changing insurance.
Further, described lightning arrester adopts the maximum working voltage, the electric current that certainly recover insurance are 250V/10A; Voltage dependent resistor (VDR) model is MYG20K561; Discharge tube model is 2RM600-8B123; Hall current sensor model is TA1016-1M; The model of current transformer is TA1016-2M, and rated operational current is 10A; The model that hummer adopts is SL1I-12CP, and specified operating voltage is 12V; Single-chip microcomputer adopts ATMEGA128; Liquid crystal display adopts LCD12864.
The utility model has the advantages that, simple in structure, not only can lighting protection can also show thunderbolt and overvoltage, be convenient to can to take in time to keep in repair targetedly after device damage, safeguard procedures.
Brief description of the drawings
Fig. 1 is block scheme of the present utility model;
Fig. 2 is the circuit theory diagrams of the utility model discharge loop;
Fig. 3 is the circuit theory diagrams that the utility model is measured current circuit.
Below in conjunction with the drawings and specific embodiments, the utility model is elaborated.
Under normal condition, the voltage dependent resistor (VDR) of discharge loop is not worked, and the mutual inductor measurement current value of measuring display section is almost nil, after the single-chip microcomputer sampling of governor circuit, shows not overvoltage by LCDs, is struck by lightning; Under overpressure conditions, the voltage dependent resistor (VDR) voltage dependent resistor (VDR) work of discharge loop, the mutual inductor measuring value of measuring display section increases, and more than the duration exceeded for 1 second, buzzer warning, liquid crystal display shows overvoltage, by the discharge tube of discharge loop, electric energy is imported to the earth; Under thunderbolt state, the voltage dependent resistor (VDR) work of discharge loop, measures the mutual inductor measuring value moment of display section to maximal value, is then zero, buzzer warning, and liquid crystal display shows thunderbolt, by discharge tube, electric energy is imported to the earth.
Referring to Fig. 1, comprise that ATMEGA128-AU is main control circuit part, LCD12864 display circuit, discharge loop, current collection circuit, RS485 telecommunication circuit, the buzzer alarm circuit of core.Described discharge loop is by certainly recovering insurance, current transformer, and voltage dependent resistor (VDR) and discharge tube composition, described measurement display section is by Hall current sensor, switch power module, single-chip microcomputer, hummer and LCDs composition; Single chip computer AT MEGA128-AU gathers and shows by LCD12864, and dirigibility is high and be with RS485 interface, and information can be transferred to backstage; Take transformer induced electric current, to judge overvoltage or thunderbolt; Adopt from recovering insurance, when thunderbolt is later from recovering, without changing insurance.
Referring to Fig. 2, discharge loop by certainly recovering to insure F1, voltage dependent resistor (VDR) MYG20K561, current transformer TA1016-2M, discharge tube 2RM600-8B123 form.In the time that current transformer TA1016-2M does not sense current signal, voltage dependent resistor (VDR) MYG20K561 does not work, and after the single chip computer AT MEGA128-AU sampling of governor circuit, LCD12864 liquid crystal display is shown as not overvoltage, is struck by lightning; The current value increase and the duration that sense as current transformer TA1016-2M exceed 1S, voltage dependent resistor (VDR) MYG20K561 work, the hummer SL1I-12CP of buzzer circuit reports to the police, and LCD12864 liquid crystal display is shown as overvoltage, and by discharge tube, electric energy is imported the earth by 2RM600-8B123; The current value moment sensing as current transformer TA1016-2M increases to maximal value, then be zero, voltage dependent resistor (VDR) MYG20K561 work, the hummer SL1I-12CP of buzzer circuit reports to the police, LCD12864 liquid crystal display is shown as thunderbolt, and by discharge tube, electric energy is imported the earth by 2RM600-8B123.
Voltage dependent resistor (VDR) and discharge tube are all lightning protection anti-over voltage type protection components and parts, realize the protection to late-class circuit, it is 280V-380V that voltage dependent resistor (VDR) is generally selected voltage breakdown, lightning protection circuit on consumer has been emergencing action, voltage dependent resistor (VDR) just just can play a role after external supply voltage raises suddenly, discharge tube add the normal work that can not affect circuit, this lower limit that will ensure the DC breakdown voltage of discharge tube must be higher than the maximum normal working voltage of circuit, determine accordingly the nominal DC breakdown magnitude of voltage of required discharge tube, so the type selecting of gas-discharge tube is nominal DC breakdown voltage 600V.
Referring to Fig. 3, to measure current circuit and formed by rectification circuit, pre-amplifier LM358 and rear class follower LM358, in this circuit, rear class LM358 realizes current detecting as follower.In the time that alternating current passes through mutual inductor, current transformer TA1016-2M induces current signal, go out a direct current signal through D62, D63, D64, D65 rectification, output to rear class follower LM358 after after pre-amplifier LM358 amplifies, finally output to the AD0 end of single-chip microcomputer .ATMEGA128-AU.
The above; it is only preferably embodiment of the utility model; protection domain of the present utility model is not limited to this; any be familiar with those skilled in the art the utility model disclose technical scope in, the simple change of the technical scheme that can obtain apparently or equivalence replace all fall in protection domain of the present utility model.