CN1838191A - Anti-theft alarm for electric power cable - Google Patents
Anti-theft alarm for electric power cable Download PDFInfo
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- CN1838191A CN1838191A CN 200610038485 CN200610038485A CN1838191A CN 1838191 A CN1838191 A CN 1838191A CN 200610038485 CN200610038485 CN 200610038485 CN 200610038485 A CN200610038485 A CN 200610038485A CN 1838191 A CN1838191 A CN 1838191A
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- diode
- theft alarm
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Abstract
This invention relates to an anti-theft alarm for electric power cable. Wherein, connecting an ac large-resistance inductance in series at least on two wires ends; arranging a dc detection power on wire supply end to form detection port with wire testing circuit with output linked to an alarm circuit; and connecting the detection port to wire on power supply end. This invention simplifies circuit to reduce cost and increase reliability, and brings benefit to treatment in time and loss reduction.
Description
Technical field
The present invention relates to a kind of to the power cable safety guard, particularly a kind of anti-theft alarm for electric power cable.
Background technology
The power cable safeguard protection is the problem that power department will solve always; existing cable anti-theft alarm circuit all adopts in remote detection terminal with voltage detecting and power carrier line communication function of the terminal installation of power cable; so the very complicated used components and parts of circuit are many; the cost height; reliability is low; also because wireless system is subjected to terrain environment (mountain area or remote districts) influence; be difficult to large scale application, and the burglar alarm that is used for the transformer side power cable of street lamp and 10KV/0.4KV grade also needs reliable and low-cost apparatus.
Summary of the invention
The present invention seeks to: for addressing the above problem, a kind of safety guard of power cable has been proposed, the burglar alarm of power cable especially, it is few to propose a kind of used components and parts, and cost is low, the power cable safety guard that reliability is high.
The present invention adopts following method to realize: the big impedance inductance of an interchange of connecting on minimum two leads in the end of power cable constitutes the test side, is provided with the circuit that direct current detects power supply and detects these two lead conducting resistance on lead.The test side is connected with terminal, and testing circuit output connects a warning circuit.
Described testing circuit is the divider resistance circuit of series connection, is connected to voltage or current sampling detecting device from divider resistance circuit one sample resistance.Also can be connected to optocoupler from sample resistance detects.
Described warning circuit comprises: be provided with the LED optical alarm circuit behind the testing circuit or constitute with alarm speaker.
Above-mentioned testing circuit also is provided with a diode and inductor and divider resistance circuit and is composed in series, and the positive pole of diode is connected with inductor, minus earth; , comprising a direct supply connect in regular turn divider resistance circuit and a diode, resistance connects the positive pole of diode.
Connect in the testing circuit diode in parallel on two leads, this diode is a 24V transient state diode.
Characteristics of the present invention are; the passive device that the not end of power cable is installed a reliable operation constitutes the test side; and the conducting or the duty of cable can be provided by voltage detecting again, protection and warning circuit are simplified, reduce the application of components and parts; reduce cost; improve circuit reliability, power cable is stolen or when suffering artificial destruction, can in time be found; make the staff accomplish timely processing, reduce the loss.The present invention is in particular for the safeguard protection of the transformer side power cable of street lamp and 10KV/0.4KV grade.
Description of drawings
Fig. 1 is this power cable alarm circuit structure diagram in an embodiment
Embodiment
Below in conjunction with accompanying drawing, describe the formation and the application of this anti-theft alarm for electric power cable in detail, the application of circuit: terminal inductance L 2 in parallel, under the daytime non-power supply state, be S1 when not closed, utilize inductance to have the little characteristics of direct current resistance, flow through L1, L2 of DC current forms the loop, at this moment, diode D1 conducting has voltage drop at the R1 two ends, makes optocoupler U1 conducting, OUT is that low level does not trigger LED optical alarm circuit or the alarm speaker that it connect, and the expression cable is normal; When cable was stolen, terminal inductance broke from the loop, and D1 and optocoupler U1 all can't conductings, and the OUT end triggers LED optical alarm circuit or the alarm speaker that it connects for high level, promptly can indicate cable disconnected, and is possible stolen.
Under the evening power supply state, when promptly S1 is closed,, pass through with regard to no current in the circuit, so can know whether stolen by the current value in the slowdown monitoring circuit if take place stolenly.
In a word, the kind of testing circuit is extremely many, being used for the present invention also is relatively simple circuit, be not limited to the simplest above-mentioned dc voltage divider circuit, also the testing circuit that can be provided with in the test side is an ac oscillator circuit, and be its frequency parameter element with the inductance of terminal, can be used for display frequency.The simple change of alternating current-direct current testing circuit does not exceed scope of the present invention.
D1 in the circuit: diode IN4007; D2:24V transient state diode; The L1 direct current resistance is not too in 1.4K, and the value of its induction reactance is 10
-1Level H, electric current is not more than 10mA under 50 all alternating voltage effects, and the direct current resistance resistance of L2 is not more than 200 Ω, and the value of its induction reactance is 8-100mH (10
-2H), electric current is not more than 20mA, R1:390 Ω under 50 all alternating voltage effects; R2:1K Ω; R3:5.1K Ω; The S1 power switch, U1: optocoupler P181
In addition, transient state diode D2 and inductance L 1 can be implemented under the power supply state defencive function to circuit.Inductance has the big characteristic of AC impedance, plays the effect of isolating alternating current, the less testing circuit path that cable termination is provided of direct current resistance, thus the protection full cable is antitheft.D2 is a 24V transient state diode, when the conducting during greater than 24V of its both end voltage, thereby realizes the circuit protection effect.
Claims (8)
1, a kind of anti-theft alarm for electric power cable is characterized in that: the big impedance inductance of an interchange of connecting on minimum two leads in the end of power cable constitutes the test side, is provided with the circuit that direct current detects power supply and detects these two lead conducting resistance on lead.
2, anti-theft alarm for electric power cable according to claim 1, it is characterized in that: the test side is connected with terminal, and the output of testing circuit connects a warning circuit.
3, anti-theft alarm for electric power cable according to claim 1 is characterized in that: described testing circuit is the divider resistance circuit of series connection, is connected to voltage or current sampling detecting device from a sample resistance of divider resistance circuit.
4, anti-theft alarm for electric power cable according to claim 3 is characterized in that: described sampling detecting device is an optocoupler.
5, anti-theft alarm for electric power cable according to claim 3 is characterized in that: described warning circuit is LED optical alarm circuit or the alarm speaker that is provided with.
6, according to claim 3 or 4 described anti-theft alarm for electric power cable, it is characterized in that: described testing circuit is composed in series by a diode and inductor and divider resistance circuit, and the positive pole of diode is connected with inductor, minus earth; , comprising a direct supply connect in regular turn divider resistance circuit and a diode, resistance connects the positive pole of diode.
7, anti-theft alarm for electric power cable according to claim 1 is characterized in that: connect in the testing circuit diode in parallel on two leads, this diode is a 24V transient state diode.
8, anti-theft alarm for electric power cable according to claim 1 is characterized in that: testing circuit is an ac oscillator circuit, and the inductance of test side is its frequency parameter element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610038485 CN1838191A (en) | 2006-02-24 | 2006-02-24 | Anti-theft alarm for electric power cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610038485 CN1838191A (en) | 2006-02-24 | 2006-02-24 | Anti-theft alarm for electric power cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1838191A true CN1838191A (en) | 2006-09-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200610038485 Pending CN1838191A (en) | 2006-02-24 | 2006-02-24 | Anti-theft alarm for electric power cable |
Country Status (1)
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| CN (1) | CN1838191A (en) |
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