CN103855702A - High-voltage-impact-resisting protection circuit and power supply accessing testing device - Google Patents
High-voltage-impact-resisting protection circuit and power supply accessing testing device Download PDFInfo
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- CN103855702A CN103855702A CN201210510243.0A CN201210510243A CN103855702A CN 103855702 A CN103855702 A CN 103855702A CN 201210510243 A CN201210510243 A CN 201210510243A CN 103855702 A CN103855702 A CN 103855702A
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Abstract
The invention relates to a high-voltage-impact-resisting protection circuit and a power supply accessing testing device. When an external power supply is connected with the first input end and the second input end of the protection circuit, an extension starting unit is communicated with a first circuit in a delay mode, so that a coil of a first relay is energized and a normally open contact of the first relay is closed; the first input end and the second input end of the protection circuit are connected with a delay relay through the normally open contact of the first relay and a coil of a second relay is connected between the control output end of the delay relay and the second input end of the protection circuit in series to form a second circuit. When the normally open contact of the first relay is closed, the delay relay is energized to work for the preset time in a delay mode and then outputs a control signal to be communicated with the second circuit, so that a coil of the second relay is energized, a normally open contact of the second relay is closed and an access between the first input end and the second input end of the protection circuit is communicated. By means of the high-voltage-impact-resisting protection circuit and the power supply accessing testing device, the phenomenon that a circuit board to be detected is damaged due to the instantly output high voltage of a voltage stabilizing power supply when a lamp power supply panel is detected can be avoided.
Description
Technical field
The present invention relates to a kind of protective circuit of anti-impacting with high pressure, be specifically related to a kind of protective circuit and power supply access testing apparatus of anti-impacting with high pressure.
Background technology
Lamp lighting is seen everywhere in modern society the inside, and the light fixture using in all trades and professions is all different, and object is all illumination, boosts productivity and workman's production security; But the most important part in light fixture the inside is power panel, these power panels, for light source provides energy, make light source can send normally light; And these power panels, after designing, whether the parameters that check light source board meets meets desiredly, just need to use power initiation, tests corresponding parameter by instrument; Under existing condition, the D.C. regulated power supply using, there is a high voltage pulse in (or disconnecting output end of stabilized voltage supply) occasional in the time starting moment and power-off: tens volts of instantaneous pressures to more than 100 volts, if power panel has been received in stabilized voltage power supply before test, now open stabilized voltage power supply power supply or outside mains failure (or test finishes rear laboratory technician and disconnects the input power of instrument), very possible output in this time high pressure; And power panel is all generally to use lower than direct current 50V power environment the inside, the withstand voltage of the electronic component of selecting when power panel design just can not be too high; Stabilized voltage power supply starts or when power-off, exports once in a while high pressure and will damage power panel like this, causes unnecessary loss; For such situation, be just necessary to provide a kind of a kind of protective circuit of in the time detecting power panel, it being protected.
Summary of the invention
Based on this; be necessary to provide a kind of protective circuit and power supply access testing apparatus of anti-impacting with high pressure; it can guarantee in the time that lamp power plate is detected; avoid damaging circuit board under test because of the moment output high pressure of stabilized voltage power supply; utilize protective circuit to eliminate the part of instantaneous pressure; so just power panel is opened the effect of protection, and do not damaged power panel.
The protective circuit of a kind of anti-impacting with high pressure the invention provides, it comprises extension start unit, time-delay relay, the first relay and the second relay,
The first input end A of described protective circuit connects the first output of described protective circuit by the normally opened contact of described the second relay, the second input of described protective circuit connects the second output;
The first input end of described protective circuit also forms the first loop by the coil of described extension start unit, described the first relay and the second input of described protective circuit, in the time accessing external power supply between the first input end of described protective circuit and the second input, the first loop described in described extension start unit Delayed conducting, make the coil electricity of described the first relay, the normally opened contact of closed described the first relay;
The first input end of described protective circuit is connected time-delay relay by the normally opened contact of described the first relay respectively with the second input, the coil of described the second relay is connected between the control output end of described time-delay relay and the second input of described protective circuit, form second servo loop, when after the normally opened contact closure of described the first relay, after described time-delay relay energising work time delay Preset Time, export second servo loop described in control signal conducting, make the coil electricity of described the second relay, the normally opened contact of closed described the second relay, path described in conducting between the first input end of protective circuit and described the first output.
Wherein, described extension start unit comprises the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, the first resistance, the second resistance, the first electric capacity and the second electric capacity, one end of described the first resistance connects one end of the first input end of described protective circuit and the coil of described the first relay, the other end of the coil of described the first relay is successively by described the first metal-oxide-semiconductor, the second metal-oxide-semiconductor connects the second input of described protective circuit, the other end of described the first resistance connects one end of described the second resistance, the control end of the first metal-oxide-semiconductor, the control end of the second metal-oxide-semiconductor, one end of one end of the first electric capacity and the second electric capacity, the other end of described the second electric capacity connects the other end of the second resistance R 2 and the second input of described protective circuit, the other end of described the first electric capacity connects the node that described the first metal-oxide-semiconductor is connected with the second metal-oxide-semiconductor.
Wherein, the normally opened contact of described the first relay comprises two-way normal open switch, and it is connected on respectively between the first input end of described protective circuit and the input of the two-way of the second input and described time-delay relay.
Wherein, also comprise: be connected on the inductance between the normally opened contact of described the second relay and the first output of described protective circuit.
Wherein, also comprise: be connected in the piezo-resistance between one end of described inductance and the second input of described protective circuit.
Wherein, also comprise the voltage stabilizing didoe being connected between the other end of described inductance and the second output of described protective circuit.
Wherein, also comprise the filter capacitor between the first output and the second output that is connected on described protective circuit.
The present invention also provides a kind of power supply access testing apparatus of anti-impacting with high pressure; it comprises protective circuit, D.C. regulated power supply and the binding clip of above-mentioned arbitrary described anti-impacting with high pressure; the positive pole of described binding clip connects the first output of described protective circuit; the negative pole of described binding clip connects the second output of described protective circuit; the input of described D.C. regulated power supply connects civil power, and the output of described D.C. regulated power supply connects respectively first input end A and second input of described protective circuit.
Wherein, described binding clip adopts the metal clamp structure with elastic reset member, and described metal clamp structure is electrically connected with the first output or second output of described protective circuit, in order to clamp the power access end of circuit board under test.
The protective circuit of anti-impacting with high pressure of the present invention and power supply access testing apparatus, can prevent that the high pressure once in a while exported from damaging external circuit board under test sample while starting to start and when unexpected power-off in the time that external power supply access, and circuit structure is simple, with low cost.
Accompanying drawing explanation
Fig. 1 is electrical block diagram of the present invention.
Embodiment
For the ease of understanding the present invention, below with reference to relevant drawings, the present invention is described more fully.In accompanying drawing, provide preferred embodiment of the present invention.But the present invention can realize in many different forms, be not limited to embodiment described herein.On the contrary, providing the object of these embodiment is to make to the understanding of disclosure of the present invention more thoroughly comprehensively.
It should be noted that, when element is called as " being fixed on " another element, it can be directly on another element or also can have an element placed in the middle.When an element is considered to " connection " another element, it can be directly connected to another element or may have centering elements simultaneously.
Unless otherwise defined, all technology that use are herein identical with the implication that belongs to the common understanding of those skilled in the art of the present invention with scientific terminology.The term using in specification of the present invention herein, just in order to describe the object of specific embodiment, is not intended to be restriction the present invention.Term as used herein " and/or " comprise one or more relevant Listed Items arbitrarily with all combinations.
Refer to Fig. 1, the present embodiment provides a kind of protective circuit 10 of anti-impacting with high pressure, it comprises extension start unit 11, time-delay relay 12, the first relay and the second relay, the first input end A of described protective circuit 10 connects the first output C of described protective circuit 10 by the normally opened contact K2-2 of described the second relay, the second input B of described protective circuit 10 connects the second output D;
The first input end A of described protective circuit 10 also forms the first loop by the coil K1-1 of described extension start unit 11, described the first relay and the second input B of described protective circuit 10, in the time accessing external power supply between the first input end A of described protective circuit 10 and the second input B, the first loop described in described extension start unit 11 Delayed conductings, make the coil K1-1 energising of described the first relay, the normally opened contact K1-2 of closed described the first relay; The extension start unit 11 is here mainly the voltage that between first input end A in order to avoid protective circuit 10 and the second input B, moment produces in the time of access voltage, this voltage can produce and damage circuit board in the time being directly loaded on circuit board under test, so by certain delay function, delay voltage is loaded into the time on circuit board under test;
On the basis of said structure, the first input end A of above-mentioned protective circuit is connected time-delay relay 12 by the normally opened contact K1-2 of described the first relay respectively with the second input B, the coil K2-1 of described the second relay is connected between the control output end of described time-delay relay 12 and the second input B of described protective circuit and forms second servo loop, when after the normally opened contact K1-2 of described the first relay closure, described time-delay relay 12 is switched on and is exported second servo loop described in control signal conducting after work time delay Preset Time, make between the first input end A of above-mentioned protective circuit 10 and the second input B by the normally opened contact K1-2 of the first relay, the coil K2-1 conducting of time-delay relay 12 and the second relay, thereby make the coil K2-1 energising of described the second relay, the normally opened contact K2-2 of closed described the second relay, path described in conducting between the first input end A of protective circuit 10 and described the first output C.
The present embodiment has adopted delay operation twice; can effectively avoid in the problem that causes protective circuit to lose efficacy because of one of them delay function element failure; thereby effectively guarantee effective protection of the process that the present embodiment protective circuit tests lamp power circuit board; but also can effectively prevent that the high pressure of exporting once in a while from damaging external circuit board under test sample in the time that external power supply accesses, while starting to start and when power-off suddenly; circuit structure is simple, with low cost.
As shown in Figure 1, the model that above-mentioned time-delay relay 12 adopts is DH48S-S, its 1 pin is connected with 3 pin, its 2 pin connects the first input end A of above-mentioned protective circuit 10 by a normally opened contact K1-2 of the first relay, its 7 pin and 8 pin are connected and are connected the second input B of above-mentioned protective circuit 10 by another normally opened contact K1-2 of the first relay, the linked switch of connecting between its 5 pin and 6 pin, its 6 pin connects the coil K2-1 of the second relay, when after the normally opened contact K1-2 of the first relay closure, model is the time-delay relay 12 energising work of DH48S-S, after time delay a period of time, 5 pin disconnect immediately, 6 pin adhesive conductings, the coil K2-1 energising of the second relay, the normally opened contact K2-2 adhesive of the second relay, path between conducting first input end A and the first output C.
As shown in Figure 1, on the basis of above-described embodiment, above-mentioned extension start unit 11 comprises the first metal-oxide-semiconductor Q1, the second metal-oxide-semiconductor Q2, the first resistance R 1, the second resistance R 2, the first capacitor C 1 and the second capacitor C 2, one end of described the first resistance R 1 connects one end of the first input end A of described protective circuit and the coil K1-1 of described the first relay, the other end of the coil K1-1 of described the first relay is successively by described the first metal-oxide-semiconductor Q1, the second metal-oxide-semiconductor Q2 connects the second input B of described protective circuit, the other end of described the first resistance R 1 connects one end of described the second resistance R 2, the control end of the first metal-oxide-semiconductor Q1, the control end of the second metal-oxide-semiconductor Q2, one end of one end of the first capacitor C 1 and the second capacitor C 2, the other end of described the second capacitor C 1 connects the other end of the second resistance R 2 and the second input B of described protective circuit, the other end of described the first capacitor C 1 connects the node that described the first metal-oxide-semiconductor Q1 is connected with the second metal-oxide-semiconductor Q2.A kind of optimum embodiment that extends start unit 11 is here provided, by first input end A, electric current first arrives the first relay coil K1-1, metal-oxide-semiconductor Q1, Q2, due to metal-oxide-semiconductor Q1, Q2 is series connection, can bear the high pressure of several hectovolts, even if first input end A moment is exported high pressure, can not puncture metal-oxide-semiconductor Q1 yet, Q2, the first relay coil K1-1 now can not switch on, the normally opened contact K1-2 of the first relay now can not be closed, time-delay relay 12 is not worked, so coil K2-1 no power of the second relay, the second relay not conducting of normally opened contact K2-2, the second relay circuit part no power below of normally opened contact K2-2, now start the first capacitor C 1, the second capacitor C 2 to charge, because the instantaneous pressure output of power supply is all in the time that energising starts, so in the first capacitor C 1, the second capacitor C 2 charging processes, just avoided the instantaneous pressure of power supply, when the voltage of the first capacitor C 1, the second capacitor C 2 reaches after metal-oxide-semiconductor Q1, Q2 cut-in voltage, metal-oxide-semiconductor Q1, Q2 conducting, the first relay coil K1-1 energising, the first relay normally open contact K1-2 closure.The preferred N raceway groove of metal-oxide-semiconductor Q1, Q2 insulating gate type field effect tube here, but the invention is not restricted to only adopt this metal-oxide-semiconductor of type, can also adopt other types, such as the metal-oxide-semiconductor of P raceway groove, the same type according to selecting metal-oxide-semiconductor, in the time of concrete two metal-oxide-semiconductors series connection, pin will change to some extent, but can realize above-mentioned functions in main body, can be by making metal-oxide-semiconductor Q1, Q2 conducting make the first relay coil K1-1 energising after the first capacitor C 1, the second capacitor C 2 have been charged.In the embodiment shown in fig. 1, the normally opened contact K1-2 of described the first relay comprises two-way normal open switch, and it is connected on respectively between the first input end A of described protective circuit and the input of the two-way of the second input B and described time-delay relay 12.
As shown in Figure 1, on the basis of above-described embodiment, described protective circuit 10 also comprises: be connected on the inductance L 1 between the normally opened contact K2-2 of described the second relay and the first output C of described protective circuit.In the time that voltage instantaneous changes, inductance L 1 has the moment of suppressing voltage to rise, and has also played the effect of protection circuit board under test below.
As shown in Figure 1, on the basis of above-described embodiment, described protective circuit 10 also comprises: be connected in the piezo-resistance R3 between one end of described inductance L 1 and the second input B of described protective circuit.The maximum input voltage that this piezo-resistance R3 puncture voltage is power panel to be measured; In the time that input voltage has the puncture voltage that exceedes piezo-resistance R3, piezo-resistance R3 punctures conducting, has played the effect of protection circuit board under test below.
As shown in Figure 1, on the basis of above-described embodiment, described protective circuit 10 also comprises the voltage stabilizing didoe D1 being connected between the other end of described inductance L 1 and the second output D of described protective circuit.The maximum input voltage that the maximum voltage stabilizing threshold voltage of this voltage stabilizing didoe D1 is power panel to be measured; In the time that input voltage has the puncture voltage that exceedes voltage stabilizing didoe D1, voltage stabilizing didoe D1 punctures conducting, has played the effect of protection circuit board under test below.
As shown in Figure 1, on the basis of above-described embodiment, described protective circuit 10 also comprises the filter capacitor C3 between the first output C and the second output D that is connected on described protective circuit, in order to the high-frequency interferencing signal of filtering output
Based on above-described embodiment; the present invention also provides a kind of power supply access testing apparatus of anti-impacting with high pressure; it comprises protective circuit 10, D.C. regulated power supply 20 and the binding clip of the anti-impacting with high pressure described in above-mentioned arbitrary scheme; the positive pole of described binding clip connects the first output C of described protective circuit; the negative pole of described binding clip connects the second output D of described protective circuit; the input of described D.C. regulated power supply 20 connects civil power, and the output of described D.C. regulated power supply 20 connects respectively first input end A and the second input B of described protective circuit 10.The binding clip here preferably adopts the metal clamp structure with elastic reset member, and described metal clamp structure is electrically connected with the first output C or the second output D of described protective circuit 10, in order to clamp the power access end of circuit board under test.
Provide as shown in Figure 1 optimum embodiment of the present invention, protective circuit 10 in this embodiment mainly comprises extends start unit 11, time-delay relay 12, the first relay and the second relay, the first input end A of described protective circuit 10 connects the first output C of described protective circuit 10 by the normally opened contact K2-2 of described the second relay, the second input B of described protective circuit 10 connects the second output D, the first input end A of described protective circuit 10 also forms the first loop by the coil K1-1 of described extension start unit 11, described the first relay and the second input B of described protective circuit 10, in the time accessing external power supply between the first input end A of described protective circuit 10 and the second input B, the first loop described in described extension start unit 11 Delayed conductings, make the coil K1-1 energising of described the first relay, the normally opened contact K1-2 of closed described the first relay, the first input end A of above-mentioned protective circuit 10 is connected time-delay relay 12 by the normally opened contact K1-2 of described the first relay respectively with the second input B, the coil K2-1 of described the second relay is connected between the control output end of described time-delay relay 12 and the second input B of described protective circuit and forms second servo loop, when after the normally opened contact K1-2 of described the first relay closure, described time-delay relay 12 is switched on and is exported second servo loop described in control signal conducting after work time delay Preset Time, make between the first input end A of above-mentioned protective circuit 10 and the second input B by the normally opened contact K1-2 of the first relay, the coil K2-1 conducting of time-delay relay 12 and the second relay, thereby make the coil K2-1 energising of described the second relay, the normally opened contact K2-2 of closed described the second relay, path described in conducting between the first input end A of protective circuit 10 and described the first output C.Wherein describe referring to the above-mentioned narration about Fig. 1 part about corresponding additional technical feature and about the structure of extension start unit 11.
Main test job principle is: before testing, this testing apparatus is received on the output of stabilized voltage power supply 20, now start stabilized voltage power supply 20, electric current first arrives the first relay coil K1-1, metal-oxide-semiconductor Q1, Q2, due to metal-oxide-semiconductor Q1, Q2 is series connection, can bear the high pressure of several hectovolts, even if first input end A moment is exported high pressure, can not puncture metal-oxide-semiconductor Q1 yet, Q2, the first relay coil K1-1 now can not switch on, the normally opened contact K1-2 of the first relay now can not be closed, time-delay relay 12 is not worked, so coil K2-1 no power of the second relay, the second relay not conducting of normally opened contact K2-2, the second relay circuit part no power below of normally opened contact K2-2, now start the first capacitor C 1, the second capacitor C 2 to charge, because the instantaneous pressure output of power supply is all in the time that energising starts, so in the first capacitor C 1, the second capacitor C 2 charging processes, just avoided the instantaneous pressure of power supply, when the voltage of the first capacitor C 1, the second capacitor C 2 reaches after metal-oxide-semiconductor Q1, Q2 cut-in voltage, metal-oxide-semiconductor Q1, Q2 conducting, the first relay coil K1-1 energising, the first relay normally open contact K1-2 closure, the 12 energising work of DH48S-S time-delay relay, after time delay a period of time, 5 pin disconnect immediately, 6 pin adhesive conductings, the coil K2-1 energising of the second relay, the normally opened contact K2-2 adhesive of the second relay, the path between conducting first input end A and the first output C, electric current arrives binding clip, has just driven power panel to be measured, if in the time of power initiation, metal-oxide-semiconductor Q1, Q2 puncture, the first relay coil K1-1 conducting, the first relay normally open contact K1-2 adhesive, now also has time-delay relay 12 these piece circuit of DH48S-S to guarantee the safety of circuit below, realizes second protection, when mains failure or turn off after power supply, also have the High voltage output of a moment, at this moment metal-oxide-semiconductor Q1, Q2, time-delay relay 12 these piece circuit do not play protective effect, so just need piezo-resistance R3, inductance L 1, voltage stabilizing didoe Z1, filter capacitor C3 below to work, in the time that instantaneous pressure comes, if while having exceeded the maximum of piezo-resistance R3, piezo-resistance R3 conducting, has protected circuit below, if piezo-resistance R3 lost efficacy, when instantaneous pressure arrives inductance L 1, inductance L 1 has the moment of suppressing voltage to rise, a now meeting slicing part on inductance, in the time that high pressure arrives voltage stabilizing didoe Z1, when voltage has exceeded voltage stabilizing didoe Z1, voltage stabilizing didoe Z1 conducting, slicing, has protected circuit below, the C3 of filtering simultaneously also has the function of slicing filtering, and the function of multiple protective like this, while making voltage be input to circuit board, will become safe and reliable, has protected power panel, avoid the impact of transient voltage to circuit board under test.
The present invention coordinates certain circuit by elements such as easy field effect transistor and relay, inductance, piezo-resistance, voltage stabilizing didoes, the infringement of the High voltage output while making it avoid stabilized voltage power supply and start moment and power-off to power panel energising and protected power panel to be measured; The advantages such as this circuit is simple, reliable, the high pressure of having exported once in a while because of stabilized voltage power supply while having solved test damages the hidden danger of power panel.
The above embodiment has only expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (9)
1. a protective circuit for anti-impacting with high pressure, is characterized in that: comprises and extends start unit, time-delay relay, the first relay and the second relay,
The first input end of described protective circuit connects the first output of described protective circuit by the normally opened contact of described the second relay, the second input of described protective circuit connects the second output;
The first input end of described protective circuit also forms the first loop by the coil of described extension start unit, described the first relay and the second input of described protective circuit, in the time accessing external power supply between the first input end of described protective circuit and the second input, the first loop described in described extension start unit Delayed conducting, make the coil electricity of described the first relay, the normally opened contact of closed described the first relay;
The first input end of described protective circuit is connected time-delay relay by the normally opened contact of described the first relay respectively with the second input, the coil of described the second relay is connected between the control output end of described time-delay relay and the second input of described protective circuit, form second servo loop, when after the normally opened contact closure of described the first relay, after described time-delay relay energising work time delay Preset Time, export second servo loop described in control signal conducting, make the coil electricity of described the second relay, the normally opened contact of closed described the second relay, path described in conducting between the first input end of protective circuit and described the first output.
2. the protective circuit of a kind of anti-impacting with high pressure according to claim 1, it is characterized in that, described extension start unit comprises the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, the first resistance, the second resistance, the first electric capacity and the second electric capacity, one end of described the first resistance connects one end of the first input end of described protective circuit and the coil of described the first relay, the other end of the coil of described the first relay is successively by described the first metal-oxide-semiconductor, the second metal-oxide-semiconductor connects the second input of described protective circuit, the other end of described the first resistance connects one end of described the second resistance, the control end of the first metal-oxide-semiconductor, the control end of the second metal-oxide-semiconductor, one end of one end of the first electric capacity and the second electric capacity, the other end of described the second electric capacity connects the other end of the second resistance R 2 and the second input of described protective circuit, the other end of described the first electric capacity connects the node that described the first metal-oxide-semiconductor is connected with the second metal-oxide-semiconductor.
3. the protective circuit of a kind of anti-impacting with high pressure according to claim 1; it is characterized in that; the normally opened contact of described the first relay comprises two-way normal open switch, and it is connected on respectively between the first input end of described protective circuit and the input of the two-way of the second input and described time-delay relay.
4. the protective circuit of a kind of anti-impacting with high pressure according to claim 1, is characterized in that, also comprises: be connected on the inductance between the normally opened contact of described the second relay and the first output of described protective circuit.
5. the protective circuit of a kind of anti-impacting with high pressure according to claim 4, is characterized in that, also comprises: be connected in the piezo-resistance between one end of described inductance and the second input of described protective circuit.
6. the protective circuit of a kind of anti-impacting with high pressure according to claim 4, is characterized in that, also comprises the voltage stabilizing didoe being connected between the other end of described inductance and the second output of described protective circuit.
7. the protective circuit of a kind of anti-impacting with high pressure according to claim 1, is characterized in that, also comprises the filter capacitor between the first output and the second output that is connected on described protective circuit.
8. the power supply of anti-impacting with high pressure access testing apparatus; it is characterized in that; comprise protective circuit, D.C. regulated power supply and the binding clip of the anti-impacting with high pressure described in arbitrary claim in the claims 1 to 7; the positive pole of described binding clip connects the first output of described protective circuit; the negative pole of described binding clip connects the second output of described protective circuit; the input of described D.C. regulated power supply connects civil power, and the output of described D.C. regulated power supply connects respectively first input end and second input of described protective circuit.
9. the power supply of a kind of anti-impacting with high pressure according to claim 8 access testing apparatus; it is characterized in that; described binding clip adopts the metal clamp structure with elastic reset member; described metal clamp structure is electrically connected with the first output or second output of described protective circuit, in order to clamp the power access end of circuit board under test.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210510243.0A CN103855702B (en) | 2012-11-30 | 2012-11-30 | The protection circuit and plant-grid connection test device of a kind of anti-impacting with high pressure |
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| CN201210510243.0A CN103855702B (en) | 2012-11-30 | 2012-11-30 | The protection circuit and plant-grid connection test device of a kind of anti-impacting with high pressure |
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| CN103855702B CN103855702B (en) | 2017-07-28 |
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Cited By (1)
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| CN110672909A (en) * | 2019-10-31 | 2020-01-10 | 国家电网有限公司 | OPGW (optical fiber composite overhead ground wire) line live indication power-off prompting system based on induction power taking |
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| CN2267529Y (en) * | 1995-03-21 | 1997-11-12 | 山西省长治市防爆电器厂 | Explosion-proof type vacuum electromagnetic starter for mining use |
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| CN110672909A (en) * | 2019-10-31 | 2020-01-10 | 国家电网有限公司 | OPGW (optical fiber composite overhead ground wire) line live indication power-off prompting system based on induction power taking |
| CN110672909B (en) * | 2019-10-31 | 2022-04-12 | 国家电网有限公司 | OPGW (optical fiber composite overhead ground wire) line live indication power-off prompting system based on induction power taking |
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| CN103855702B (en) | 2017-07-28 |
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