CN204613284U - The warning device of monitoring leakage current of an arrester - Google Patents
The warning device of monitoring leakage current of an arrester Download PDFInfo
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- CN204613284U CN204613284U CN201520197138.5U CN201520197138U CN204613284U CN 204613284 U CN204613284 U CN 204613284U CN 201520197138 U CN201520197138 U CN 201520197138U CN 204613284 U CN204613284 U CN 204613284U
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- arrester
- resistance
- leakage current
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Abstract
Monitor a warning device for leakage current of an arrester, comprise voltage dependent resistor (VDR), power choke coil, the first resistance, current transformer, the second resistance, voltage comparator circuit, PNP triode, electromagnetic relay, fly-wheel diode and voice guard.The warning device of monitoring leakage current of an arrester of the present utility model, can will occur that the lightning arrester voice guard sounding 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 warning device of monitoring leakage current of an arrester.
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 warning device of monitoring leakage current of an arrester, comprises voltage dependent resistor (VDR), power choke coil, the first resistance, current transformer, the second resistance, voltage comparator circuit, PNP triode, electromagnetic relay, fly-wheel diode and voice guard;
One end of described voltage dependent resistor (VDR) connects the output terminal of lightning arrester and one end of described power choke coil, 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 one end of described second resistance and the input end of described voltage comparator circuit, the other end of the secondary coil of described current transformer connects one end of the coil of the other end of described second resistance, the anode of described fly-wheel diode and described electromagnetic relay, and the output terminal of described voltage comparator circuit connects the base stage of described PNP triode;
The collector of described PNP triode connects the other end of the coil of described electromagnetic relay and the negative electrode of described fly-wheel diode, the emitter of described PNP triode is suitable for reception first supply voltage, a contact of described electromagnetic relay is suitable for receiving second source voltage, another contact of described electromagnetic relay connects the power end of described voice guard, and described voltage comparator circuit is suitable for controlling described PNP triode conducting at the voltage of its input end higher than during the threshold voltage preset.
Optionally, the warning device of described monitoring leakage current of an arrester 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, the warning device of described monitoring leakage current of an arrester 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 voltage comparator circuit is voltage compare chip, gas-discharge tube or two-way admittance diode.
Optionally, described electromagnetic relay is dynamic circuit connector type electromagnetic relay.
Compared with prior art, the utility model has the following advantages:
The warning device of the monitoring leakage current of an arrester 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 current return is made up of devices such as power choke coil, the first resistance, current transformer, the second resistance, voltage comparator circuit, PNP triode, electromagnetic relay, fly-wheel diode and voice guards, for the leakage current of lightning arrester of releasing, and control described voice guard when the leakage current peak value of lightning arrester is greater than the current value of setting and carry out sounding alarm.Patrolling transmission line personnel are by checking described voice guard whether sounding, 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 warning device of the monitoring leakage current of an arrester of the utility model embodiment;
Fig. 2 is the another kind of electrical block diagram of the warning device of the monitoring leakage current of an arrester of the utility model embodiment;
Fig. 3 is the another kind of electrical block diagram of the warning device of the monitoring leakage current of an arrester 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 a kind of electrical block diagram of monitoring the warning device of leakage current of an arrester that the utility model embodiment provides, and the warning device of described monitoring leakage current of an arrester 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, PNP triode Q1, electromagnetic relay JH1, sustained diode 11 and voice guard 12.
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, 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 described one end of second resistance R12 and the input end of described voltage comparator circuit 10, the other end of the secondary coil of described current transformer L12 connects one end of the coil of the described other end of the second resistance R12, the anode of described sustained diode 11 and described electromagnetic relay JH1, and the output terminal of described voltage comparator circuit 11 connects the base stage of described PNP triode Q1; The collector of described PNP triode Q1 connects the other end of the coil of described electromagnetic relay JH1 and the negative electrode of described sustained diode 11, the emitter of described PNP triode Q1 is suitable for reception first supply voltage VCC1, a contact of described electromagnetic relay JH1 is suitable for receiving second source voltage VCC2, and another contact of described electromagnetic relay JH1 connects the power end of described voice guard 12.
The emitter that described first supply voltage VCC1 is suitable for described PNP triode Q1 is powered, and can be 5V voltage; Described second source voltage VCC2 is suitable for described voice guard 12 and powers, and can be that DC voltage also for 220V alternating voltage, specifically can be determined according to the power demands of described voice guard 12.Described first supply voltage VCC1 and described second source voltage VCC2 can be provided by transmission line of electricity electric supply installation, such as solar cell etc.Further, described electromagnetic relay JH1 is dynamic circuit connector type electromagnetic relay, and when namely not having electric current to flow through the coil of described electromagnetic relay JH1, two contacts of described electromagnetic relay JH1 remain open state.Described voltage comparator circuit 11 is suitable for controlling described PNP triode Q1 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 warning device of the monitoring leakage current of an arrester 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 PNP triode Q1 is in cut-off state, no current flows through the coil of described electromagnetic relay JH1, and two contacts of described electromagnetic relay JH1 are in off-state, and described voice guard 12 to be powered not sounding because of non-transformer, on the contrary, if lightning arrester 10 is because making moist, there are quality problems in the reason such as aging, 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 PNP triode Q1 conducting, electric current is had to flow through the coil of described electromagnetic relay JH1, two contacts of described electromagnetic relay JH1 connect, described second source voltage VCC2 is that described voice guard 12 is powered, described voice guard 12 sounding alarm.
The warning device of the monitoring leakage current of an arrester 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 voice guard 12 sounding once.Patrolling transmission line personnel are by checking described voice guard 12 whether sounding, 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 warning device of the another kind monitoring leakage current of an arrester that the utility model embodiment provides, and the warning device of described monitoring leakage current of an arrester 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, PNP triode Q2, electromagnetic relay JH2, sustained diode 21, voice guard 22 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 PNP triode Q2, described electromagnetic relay JH2, described sustained diode 21 and described voice guard 22 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 warning device of the monitoring leakage current of an arrester 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 the warning device of monitoring leakage current of an arrester further.
Fig. 3 is the electrical block diagram of the warning device of the another kind monitoring leakage current of an arrester that the utility model embodiment provides, and the warning device of described monitoring leakage current of an arrester 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, PNP triode Q3, electromagnetic relay JH3, sustained diode 31, voice guard 32, 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 PNP triode Q3, described electromagnetic relay JH3, described sustained diode 31 and described voice guard 32 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 warning device of the monitoring leakage current of an arrester 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 the warning device of monitoring leakage current of an arrester further.
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. monitor the warning device of leakage current of an arrester for one kind, it is characterized in that, comprise voltage dependent resistor (VDR), power choke coil, the first resistance, current transformer, the second resistance, voltage comparator circuit, PNP triode, electromagnetic relay, fly-wheel diode and voice guard;
One end of described voltage dependent resistor (VDR) connects the output terminal of lightning arrester and one end of described power choke coil, 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 one end of described second resistance and the input end of described voltage comparator circuit, the other end of the secondary coil of described current transformer connects one end of the coil of the other end of described second resistance, the anode of described fly-wheel diode and described electromagnetic relay, and the output terminal of described voltage comparator circuit connects the base stage of described PNP triode;
The collector of described PNP triode connects the other end of the coil of described electromagnetic relay and the negative electrode of described fly-wheel diode, the emitter of described PNP triode is suitable for reception first supply voltage, a contact of described electromagnetic relay is suitable for receiving second source voltage, another contact of described electromagnetic relay connects the power end of described voice guard, and described voltage comparator circuit is suitable for controlling described PNP triode conducting at the voltage of its input end higher than during the threshold voltage preset.
2. the warning device of monitoring leakage current of an arrester 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. the warning device of monitoring leakage current of an arrester 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 warning device of monitoring leakage current of an arrester according to claim 1, is characterized in that, described voltage comparator circuit is voltage compare chip, gas-discharge tube or two-way admittance diode.
5. the warning device of monitoring leakage current of an arrester according to claim 1, is characterized in that, described electromagnetic relay is dynamic circuit connector type electromagnetic relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520197138.5U CN204613284U (en) | 2015-04-03 | 2015-04-03 | The warning device of monitoring leakage current of an arrester |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520197138.5U CN204613284U (en) | 2015-04-03 | 2015-04-03 | The warning device of monitoring leakage current of an arrester |
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| CN204613284U true CN204613284U (en) | 2015-09-02 |
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| CN201520197138.5U Expired - Fee Related CN204613284U (en) | 2015-04-03 | 2015-04-03 | The warning device of monitoring leakage current of an arrester |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104734131A (en) * | 2015-04-03 | 2015-06-24 | 四川蓝讯宝迩电子科技有限公司 | Lightning arrester monitoring system with audible alarm function |
-
2015
- 2015-04-03 CN CN201520197138.5U patent/CN204613284U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104734131A (en) * | 2015-04-03 | 2015-06-24 | 四川蓝讯宝迩电子科技有限公司 | Lightning arrester monitoring system with audible alarm function |
| CN104734131B (en) * | 2015-04-03 | 2017-12-01 | 四川蓝讯宝迩电子科技有限公司 | Arrester monitoring system with sound alarm function |
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| Date | Code | Title | Description |
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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: 20150902 Termination date: 20210403 |
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| CF01 | Termination of patent right due to non-payment of annual fee |