CN204595115U - Surge arrester failure display module - Google Patents
Surge arrester failure display module Download PDFInfo
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- CN204595115U CN204595115U CN201520197137.0U CN201520197137U CN204595115U CN 204595115 U CN204595115 U CN 204595115U CN 201520197137 U CN201520197137 U CN 201520197137U CN 204595115 U CN204595115 U CN 204595115U
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Abstract
A kind of surge arrester failure display module, comprises voltage dependent resistor (VDR), power choke coil, the first resistance, current transformer, the second resistance, voltage comparator circuit, NPN triode, PNP triode, the 3rd resistance and light emitting diode.Surge arrester failure display module of the present utility model, can will occur that the lightning arrester LED flash of quality problems indicates, be convenient to remind patrolling transmission line personnel to carry out periodicity prophylactic tria to defective in quality lightning arrester, thus save detection resource, raising detection efficiency, alleviate lightning arrester power failure proof strength, strengthen the reliability of electrical network.
Description
Technical field
The utility model relates to transmission line of electricity monitoring technology on-line field, particularly a kind of surge arrester failure display module.
Background technology
Along with the intelligentized fast development of China's electrical network, the reliability of various smart machine seems extremely important.Wherein the reliability of metal oxide arrester directly affects the safe operation of other equipment in electric system, and the duty of therefore monitoring metal oxide arrester becomes and becomes more and more important.
Gapless metal-oxide lighting arrester is primarily of the part such as insulator, resistor disc and dielectric framework composition, and wherein important basic structure is exactly resistor disc, is to be connected by metal zinc oxide resistor disc and/or compose in parallel and without lightning arrester that is in parallel or series spark gap.Zinc oxide resistance sheet has the nonlinear characteristic be highly profitable, and having, the resistance presented under the high voltages such as thunderbolt is very little, a large amount of lightning current and residual voltage is very low of can releasing; Under electrical network normal operating voltage, the resistance that lightning arrester presents is very large, and leakage current only has 50 μ A ~ 150 μ A, and electric current is too small be can be considered without power frequency continued flow.
Because metal oxide arrester does not have discharging gap, zinc oxide resistance sheet bears working voltage for a long time, and has leakage current constantly to flow through each resistance in series sheet of lightning arrester, and the size of this electric current depends on the degree of aging of the thermally-stabilised of lightning arrester and resistor disc.Lightning arrester is generally arranged on outdoor, and be easy to make moist, there is filth on aging and surface, this all can make the normal dielectric level over the ground of lightning arrester reduce, and leakage current increases, directly breakdown and damage.Therefore, can using a kind of important means of leakage current as monitoring lightning arrester quality condition measuring lightning arrester.
The classic method of monitoring lightning arrester quality condition carries out periodicity prophylactic tria, under lightning arrester power down mode, namely detect lightning arrester direct current 1mA lower critical action reference voltage U
1mAwith 75% U
1mAunder leakage current, by test can check whether the valve block of lightning arrester makes moist, determine whether its performance meets the requirements.Periodically the measurement result of prophylactic tria accurately and reliably, but the lightning arrester under normal operating conditions all will accept periodically prophylactic tria, causes and detect the wasting of resources, detection efficiency is low.Further, periodically prophylactic tria must make lightning arrester power failure carry out, and adopts the cost of the method monitoring lightning arrester quality condition very high.
Utility model content
To be solved in the utility model is adopt that the cost of periodically prophylactic tria monitoring lightning arrester quality condition is high, efficiency is low, detect the problem of the wasting of resources.
For solving the problem, the utility model provides a kind of surge arrester failure display module, comprises voltage dependent resistor (VDR), power choke coil, the first resistance, current transformer, the second resistance, voltage comparator circuit, NPN triode, PNP triode, the 3rd resistance and light emitting diode;
One end of described voltage dependent resistor (VDR) connects the output terminal of lightning arrester and one end of described power choke coil, and the other end of described voltage dependent resistor (VDR) connects one end of the primary coil of described current transformer and ground connection;
The other end of described power choke coil connects one end of described first resistance, and the other end of described first resistance connects the other end of the primary coil of described current transformer;
One end of the secondary coil of described current transformer connects the emitter of one end of described second resistance, the input end of described voltage comparator circuit and described PNP triode, and the other end of the secondary coil of described current transformer connects the other end of described second resistance, the emitter of described NPN triode and the negative electrode of described light emitting diode;
The output terminal of described voltage comparator circuit connects the base stage of described NPN triode and the collector of described PNP triode, the collector of described NPN triode connects the base stage of described PNP triode and one end of described 3rd resistance, the other end of described 3rd resistance connects the anode of described light emitting diode, and described voltage comparator circuit is suitable for controlling described NPN triode ON at the voltage of its input end higher than during the threshold voltage preset.
Optionally, described surge arrester failure display module also comprises transient voltage suppressor;
One end of described transient voltage suppressor connects the other end of described power choke coil, the other end ground connection of described transient voltage suppressor.
Optionally, described surge arrester failure display module also comprises the first voltage stabilizing diode and the second voltage stabilizing diode;
The anode of described first voltage stabilizing diode connects the other end of described power choke coil, and the negative electrode of described first voltage stabilizing diode connects the negative electrode of described second voltage stabilizing diode, the plus earth of described second voltage stabilizing diode.
Optionally, described surge arrester failure display module also comprises filter capacitor;
One end of described filter capacitor connects the output terminal of described voltage comparator circuit, and the other end of described filter capacitor connects the other end of described second resistance.
Optionally, described voltage comparator circuit is voltage compare chip, gas-discharge tube or two-way admittance diode.
Compared with prior art, the utility model has the following advantages:
The surge arrester failure display module that the utility model provides comprises two current returns: a current return connects the output terminal of lightning arrester directly to ground by voltage dependent resistor (VDR), the thunder-strike current that when being struck by lightning for transmission line of electricity of releasing, lightning arrester is released; Another article current return is made up of power choke coil, the first resistance, current transformer, the second resistance, voltage comparator circuit, NPN triode, PNP triode, the 3rd device such as resistance and light emitting diode, for the leakage current of lightning arrester of releasing, and control described light emitting diode when the leakage current peak value of lightning arrester is greater than the current value of setting and glimmer.Whether patrolling transmission line personnel glimmer by observing described light emitting diode, can judge that lightning arrester is the need of carrying out periodicity prophylactic tria intuitively, thus save detection resource, raising detection efficiency, alleviate lightning arrester power failure proof strength, strengthen the reliability of electrical network.
Accompanying drawing explanation
Fig. 1 is a kind of electrical block diagram of the surge arrester failure display module of the utility model embodiment;
Fig. 2 is the another kind of electrical block diagram of the surge arrester failure display module of the utility model embodiment;
Fig. 3 is the another kind of electrical block diagram of the surge arrester failure display module of the utility model embodiment;
Fig. 4 is the another kind of electrical block diagram of the surge arrester failure display module of the utility model embodiment.
Embodiment
Below in conjunction with embodiment and accompanying drawing, to the detailed description further of the utility model do, but embodiment of the present utility model is not limited thereto.
Fig. 1 is the electrical block diagram of a kind of surge arrester failure display module that the utility model embodiment provides, and described surge arrester failure display module comprises voltage dependent resistor (VDR) R10, power choke coil L11, the first resistance R11, current transformer L12, the second resistance R12, voltage comparator circuit 11, NPN triode Q11, PNP triode Q12, the 3rd resistance R13 and light emitting diode D11.
Particularly, one end of described voltage dependent resistor (VDR) R10 connects the output terminal of lightning arrester 10 and one end of described power choke coil L11, and the other end of described voltage dependent resistor (VDR) R10 connects one end of the primary coil of described current transformer L12 and ground connection; The other end of described power choke coil L11 connects one end of described first resistance R11, and the other end of described first resistance R11 connects the other end of the primary coil of described current transformer L12; One end of the secondary coil of described current transformer L12 connects the emitter of described one end of second resistance R12, the input end of described voltage comparator circuit 10 and described PNP triode Q12, and the other end of the secondary coil of described current transformer L12 connects the other end of described second resistance R12, the emitter of described NPN triode Q11 and the negative electrode of described light emitting diode D11; The output terminal of described voltage comparator circuit 11 connects the described base stage of NPN triode Q11 and the collector of described PNP triode Q12, the collector of described NPN triode Q11 connects the base stage of described PNP triode Q12 and one end of described 3rd resistance R13, and the other end of described 3rd resistance R13 connects the anode of described light emitting diode D11.Further, described voltage comparator circuit 11 is suitable for controlling described NPN triode Q11 conducting at the voltage of its input end higher than during the threshold voltage preset, and described threshold voltage sets according to the leakage current standard of lightning arrester 10.Described voltage comparator circuit 11 can be voltage compare chip, gas-discharge tube or two-way admittance diode, and the utility model is not construed as limiting this.
Described voltage dependent resistor (VDR) R10 is when the output end voltage of lightning arrester 10 is lower than its pressure sensitive voltage, and the electric current flowing through described voltage dependent resistor (VDR) R10 is very little, and described voltage dependent resistor (VDR) R10 is equivalent to a valve shut; When the output end voltage of lightning arrester 10 is not less than the pressure sensitive voltage of described voltage dependent resistor (VDR) R10, the electric current flowing through described voltage dependent resistor (VDR) R10 increases sharply, and is equivalent to valve open.Described power choke coil L11 is equivalent to wire with the leakage current of lightning arrester 10 of releasing when transmission line of electricity is struck by lightning, the thunder-strike current that impedance increase stops lightning arrester 10 to be released when transmission line of electricity is struck by lightning flows through.Described first resistance R11 is for limiting the electric current of the primary coil flowing through described current transformer L12, described current transformer L12 can be the current transformer of 1:1 for primary and secondary turns ratio, high-precision monitoring current can be obtained, and by the circuit of rear end and lightning arrester 10 electrical isolation.The electric current of the secondary coil flowing through described current transformer L12 is converted to monitoring voltage by described second resistance R12, and described monitoring voltage and the threshold voltage preset compare by described voltage comparator circuit 11.
Below the principle of work of the surge arrester failure display module of the present embodiment is described:
When transmission line of electricity is struck by lightning, lightning arrester 10 action, thunder-strike current of releasing within the very short time.According to the characteristic of voltage dependent resistor (VDR) and power choke coil, lightning arrester 10 thunder-strike current of releasing is released to greatly by described voltage dependent resistor (VDR) R10.
When transmission line of electricity is struck by lightning, lightning arrester 10 is failure to actuate, described voltage dependent resistor (VDR) R10 presents high impedance status, and the leakage current of lightning arrester 10 is released to greatly by the loop that the primary coil of described power choke coil L11, described first resistance R11 and described current transformer L12 is formed.If the quality condition of lightning arrester 10 is good, the current peak flowing through the secondary coil of described current transformer L12 is very little, the monitoring voltage peak value correspondingly changed into through described second resistance R12 is also very little, lower than described pre-determined threshold voltage, described NPN triode Q11 and described PNP triode Q12 is in cut-off state, and described light emitting diode D11 is not luminous; On the contrary, if there are quality problems because of the reason such as to make moist, aging in lightning arrester 10, the leakage current peak value of lightning arrester 10 increases, the current peak flowing through the secondary coil of described current transformer L12 increases, the monitoring voltage peak value correspondingly changed into through described second resistance R12 increases, higher than described pre-determined threshold voltage, described voltage comparator circuit 11 controls described NPN triode Q11 conducting, then described PNP triode Q12 also conducting, the monitoring voltage that described second resistance R12 changes into lights described light emitting diode D11 by described 3rd resistance R13.
The surge arrester failure display module that this enforcement provides, to be released by described voltage dependent resistor (VDR) R10 the thunder-strike current of lightning arrester 10, the leakage current of lightning arrester 10 of being released by the primary coil of described power choke coil L11, described first resistance R11 and described current transformer L12.If quality problems appear in lightning arrester 10, when the peak value of the leakage current of lightning arrester 10 arrives, described light emitting diode D11 glimmers once.Whether patrolling transmission line personnel glimmer by observing described light emitting diode D11, can judge that lightning arrester 10 is the need of carrying out periodicity prophylactic tria intuitively, thus save detection resource, raising detection efficiency, alleviate lightning arrester power failure proof strength, strengthen the reliability of electrical network.
Fig. 2 is the electrical block diagram of the another kind of surge arrester failure display module that the utility model embodiment provides, and described surge arrester failure display module comprises voltage dependent resistor (VDR) R20, power choke coil L21, the first resistance R21, current transformer L22, the second resistance R22, voltage comparator circuit 21, NPN triode Q21, PNP triode Q22, the 3rd resistance R23, light emitting diode D21 and transient voltage suppressor D22.The syndeton of described voltage dependent resistor (VDR) R20, described power choke coil L21, described first resistance R21, described current transformer L22, described second resistance R22, described voltage comparator circuit 21, described NPN triode Q21, described PNP triode Q22, described 3rd resistance R23 and described light emitting diode D21 and the function embodiment corresponding with Fig. 1 similar, do not repeat them here.One end of described transient voltage suppressor D22 connects the other end of described power choke coil L21, the other end ground connection of described transient voltage suppressor D22.
Compared with the embodiment that Fig. 1 is corresponding; the surge arrester failure display module of the present embodiment connects described transient voltage suppressor D22 between the other end and ground of described power choke coil L21; described current transformer L22 can be protected further from the damage of thunderbolt, improve the reliability of surge arrester failure display module further.
Fig. 3 is the electrical block diagram of the another kind of surge arrester failure display module that the utility model embodiment provides, and described surge arrester failure display module comprises voltage dependent resistor (VDR) R30, power choke coil L31, the first resistance R31, current transformer L32, the second resistance R32, voltage comparator circuit 31, NPN triode Q31, PNP triode Q32, the 3rd resistance R33, light emitting diode D31, the first voltage stabilizing diode D32 and the second voltage stabilizing diode D33.The syndeton of described voltage dependent resistor (VDR) R30, described power choke coil L31, described first resistance R31, described current transformer L32, described second resistance R32, described voltage comparator circuit 31, described NPN triode Q31, described PNP triode Q32, described 3rd resistance R33 and described light emitting diode D31 and the function embodiment corresponding with Fig. 1 similar, do not repeat them here.The anode of described first voltage stabilizing diode D32 connects the other end of described power choke coil L31, and the negative electrode of described first voltage stabilizing diode D32 connects the negative electrode of described second voltage stabilizing diode D33, the plus earth of described second voltage stabilizing diode D33.
Compared with the embodiment that Fig. 1 is corresponding; the surge arrester failure display module of the present embodiment connects described first voltage stabilizing diode D32 and described second voltage stabilizing diode D33 between the other end and ground of described power choke coil L21; described current transformer L32 can be protected further from the damage of thunderbolt, improve the reliability of surge arrester failure display module further.
Fig. 4 is the electrical block diagram of the another kind of surge arrester failure display module that the utility model embodiment provides, and described surge arrester failure display module comprises voltage dependent resistor (VDR) R40, power choke coil L41, the first resistance R41, current transformer L42, the second resistance R42, voltage comparator circuit 41, NPN triode Q41, PNP triode Q42, the 3rd resistance R43, light emitting diode D41 and filter capacitor C41.The syndeton of described voltage dependent resistor (VDR) R40, described power choke coil L41, described first resistance R41, described current transformer L42, described second resistance R42, described voltage comparator circuit 41, described NPN triode Q41, described PNP triode Q42, described 3rd resistance R43 and described light emitting diode D41 and the function embodiment corresponding with Fig. 1 similar, do not repeat them here.One end of described filter capacitor C41 connects the output terminal of described voltage comparator circuit 41, and the other end of described filter capacitor C41 connects the other end of described second resistance R42.
Compared with the embodiment that Fig. 1 is corresponding, the surge arrester failure display module of the present embodiment connects described filter capacitor C41 between the output terminal and the other end of described second resistance R42 of described voltage comparator circuit 41, filtering can be carried out to the output end voltage of described voltage comparator circuit 41, improve the accuracy triggering described NPN triode Q41 conducting.
The above; it is only preferred embodiment of the present utility model; not do any pro forma restriction to the utility model, every any simple modification, equivalent variations done above embodiment according to technical spirit of the present utility model, all falls within protection domain of the present utility model.
Claims (5)
1. a surge arrester failure display module, is characterized in that, comprises voltage dependent resistor (VDR), power choke coil, the first resistance, current transformer, the second resistance, voltage comparator circuit, NPN triode, PNP triode, the 3rd resistance and light emitting diode;
One end of described voltage dependent resistor (VDR) connects the output terminal of lightning arrester and one end of described power choke coil, and the other end of described voltage dependent resistor (VDR) connects one end of the primary coil of described current transformer and ground connection;
The other end of described power choke coil connects one end of described first resistance, and the other end of described first resistance connects the other end of the primary coil of described current transformer;
One end of the secondary coil of described current transformer connects the emitter of one end of described second resistance, the input end of described voltage comparator circuit and described PNP triode, and the other end of the secondary coil of described current transformer connects the other end of described second resistance, the emitter of described NPN triode and the negative electrode of described light emitting diode;
The output terminal of described voltage comparator circuit connects the base stage of described NPN triode and the collector of described PNP triode, the collector of described NPN triode connects the base stage of described PNP triode and one end of described 3rd resistance, the other end of described 3rd resistance connects the anode of described light emitting diode, and described voltage comparator circuit is suitable for controlling described NPN triode ON at the voltage of its input end higher than during the threshold voltage preset.
2. surge arrester failure display module according to claim 1, is characterized in that, also comprise transient voltage suppressor;
One end of described transient voltage suppressor connects the other end of described power choke coil, the other end ground connection of described transient voltage suppressor.
3. surge arrester failure display module according to claim 1, is characterized in that, also comprises the first voltage stabilizing diode and the second voltage stabilizing diode;
The anode of described first voltage stabilizing diode connects the other end of described power choke coil, and the negative electrode of described first voltage stabilizing diode connects the negative electrode of described second voltage stabilizing diode, the plus earth of described second voltage stabilizing diode.
4. the surge arrester failure display module according to any one of claims 1 to 3, is characterized in that, also comprise filter capacitor;
One end of described filter capacitor connects the output terminal of described voltage comparator circuit, and the other end of described filter capacitor connects the other end of described second resistance.
5. surge arrester failure display module according to claim 1, is characterized in that, described voltage comparator circuit is voltage compare chip, gas-discharge tube or two-way admittance diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520197137.0U CN204595115U (en) | 2015-04-03 | 2015-04-03 | Surge arrester failure display module |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520197137.0U CN204595115U (en) | 2015-04-03 | 2015-04-03 | Surge arrester failure display module |
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| CN204595115U true CN204595115U (en) | 2015-08-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104734132A (en) * | 2015-04-03 | 2015-06-24 | 四川蓝讯宝迩电子科技有限公司 | Automatic lightning arrester working abnormity alarm circuit |
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2015
- 2015-04-03 CN CN201520197137.0U patent/CN204595115U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104734132A (en) * | 2015-04-03 | 2015-06-24 | 四川蓝讯宝迩电子科技有限公司 | Automatic lightning arrester working abnormity alarm circuit |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150826 Termination date: 20210403 |
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| CF01 | Termination of patent right due to non-payment of annual fee |