CN2453453Y - Anti-theft and alrming devicefor agricultural power line - Google Patents
Anti-theft and alrming devicefor agricultural power line Download PDFInfo
- Publication number
- CN2453453Y CN2453453Y CN 00256491 CN00256491U CN2453453Y CN 2453453 Y CN2453453 Y CN 2453453Y CN 00256491 CN00256491 CN 00256491 CN 00256491 U CN00256491 U CN 00256491U CN 2453453 Y CN2453453 Y CN 2453453Y
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- circuit
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- phase
- electricity
- transmission line
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Abstract
The utility model relates to an anti-theft alarming device for an agricultural power line. In lines of three phases A, B, C at the output terminal of a power supply main switch, the A and the B are connected by a thermal resistor, and the A and the C are also connected by a thermal resistor; a direct current signal which is connected between the output terminal of the power supply main switch and the thermal resistor in the line of the phase A and the phase B and a direct current signal which is connected between the output terminal of the power supply main switch and the thermal resistor in the line of the phase A and the phase C are respectively connected with the input terminal of the negative phase of each comparator respectively; the output terminal of a standard signal generating circuit is connected with the input terminal of the positive phase of the comparator, and the output terminal of the comparator is connected with a relay which can control an alarm circuit through a drive circuit. When the main switch is broken and the lines are intact, the line does not alarm; when any line is cut off, the relay can start the alarm circuit, so that the utility model can alarm for the behaviors of theft and cutting when an agricultural power line lies idle.
Description
The utility model is a kind of agricultural transmission line of electricity burglar alarm.
Agricultural transmission line of electricity generally provides three-phase alternating current, and it mainly is that electric power supply was provided when the busy farming season.These circuit major parts are distributed in the field, owing to have a large capacity and a wide range, can't keep an eye on, and its material generally are to adopt the higher bare aluminium wire of price, thereby are that the offender steals the main target of cutting at slack seasons.Pendant lamp or remove the way of circuit farm slack season at night are taked in the villages and small towns that have, but consumed power has so not only also increased labour's investment.
The purpose of this utility model is: design a kind of line burglar alarm when agricultural transmission line of electricity is idle.
The utility model is at power supply master switch K
1Output terminals A, B, C three-phase line in A be connected by thermistor respectively with C with B, A, be connected to A and B power supply master switch K in the circuit mutually
1Between output terminal and the thermistor and A and C power supply master switch K in the circuit mutually
1Direct current signal between output terminal and the thermistor is connected to the negative-phase input of comparer separately respectively, and the output terminal of standard signal generation circuit is connected to the normal phase input end of comparer, and the output terminal of comparer connects the relay of control warning circuit by driving circuit.
The utility model is to utilize the characteristic of thermistor to realize.The resistance of thermistor is bordering on zero at normal temperatures, and when its two ends added that certain voltage forms certain electric current, its resistance was upgraded to infinity rapidly, and then circuit forms open circuit.Therefore, at master switch K
1When closed, be open circuit between A, B, the C three-phase, the level of the negative-phase input of comparer is higher than normal phase input end, and then relay can't start warning circuit.At master switch K
1Disconnect and circuit when intact, the negative-phase input level of comparer is higher than normal phase input end, and comparer is output as zero, and relay is not worked; When arbitrary circuit is cut off, the output terminal of comparer output high level, relay starts warning circuit generation alerting signal.Warning circuit of the present utility model can adopt hummer or other common known signal output circuit.In addition, because the development of integrated circuit production technology can comprise a plurality of comparers in the same integrated package, thereby many transmission lines of electricity can use same integrated package that signal is compared and the start signal output warning circuit is reported to the police.
In the utility model, the direct current signal on B, the C circuit can be the external dc signal, also can be AC signal, at this moment, it is connected with comparer by step-down, rectification, filtering respectively.And step-down, rectification, filtering circuit can comprise series circuit, the output termination capacitor of diode and the filtering circuit that resistance composes in parallel of dropping resistor and diode.
In addition, the output terminal of each comparer can connect the relay and the warning circuit of control separately respectively, connects the input end with one drive circuit after also can joining, and the output terminal of driving circuit connects shared warning circuit by relay J.
The power supply that is connected to comparer negative circuit in the utility model can utilize agricultural transmission line of electricity to realize, its concrete structure is power supply master switch K
1In be connected by switch between input end and the output terminal of A phase.
Standard signal generation circuit of the present utility model comprises transformer, rectification circuit and mu balanced circuit.Its power supply can be adopted external AC power supply, also can use agricultural transmission line of electricity that power supply is provided, i.e. the input end of standard signal generation circuit is connected to master switch K by switch
1Input end.Like this, the circuit that connects the positive and negative phase of comparer all can use agricultural circuit to power, and its concrete structure is: master switch K
1Pass through double-break switch K between the input end of A phase and the output terminal
2Connect, it connects with A output terminal and standard signal generation circuit mutually respectively.
Below in conjunction with accompanying drawing embodiment of the present utility model is elaborated.
Fig. 1 is the wiring diagram of the utility model embodiment;
As shown in the figure, present embodiment comprises and master switch K
1A, the B, the C three phase transmission line that connect are at master switch K
1Output terminal have two thermistors respectively circuit A to be connected with circuit C with circuit B and circuit A, and double-break switch K is arranged
2Input end and master switch K
1The A of input end is connected.Double-break switch K
2An output termination master switch K
1The output terminal of A phase, its another output termination standard signal generation circuit.Standard signal generation circuit comprises transformer, the bridge rectifier circuit that connects successively and has the mu balanced circuit of integrated package of pressure-stabilizing IC3 that the output terminal of mu balanced circuit is connected to the normal phase input end of two comparers by resistance.Master switch K in the present embodiment
1The B of output terminal, C two-phase are respectively by thermistor and master switch K
1The A phase output terminal connect, and at thermistor and master switch K
1Between the corresponding output terminal respectively by dropping resistor, commutation diode be connected to the negative-phase input of two comparers by the filtering circuit that resistance and electric capacity compose in parallel.The output terminal of the two comparers connecting resistance R behind the diode that connects respectively
7An end, resistance R
7The other end be connected to the base stage of triode T, the output relay termination J of triode T is by the K switch of relay J control
3Connect with hummer.
Claims (8)
1, a kind of agricultural transmission line of electricity burglar alarm is characterized in that: at power supply master switch K
1Output terminals A, B, C three-phase line in A be connected by thermistor respectively with C with B, A, be connected to A and B power supply master switch K in the circuit mutually
1Between output terminal and the thermistor and A and C power supply master switch K in the circuit mutually
1Direct current signal between output terminal and the thermistor is connected to the negative-phase input of comparer separately respectively, and the output terminal of standard signal generation circuit is connected to the normal phase input end of comparer, and the output terminal of comparer connects the relay of control warning circuit by driving circuit.
2, agricultural transmission line of electricity burglar alarm according to claim 1, it is characterized in that: B, C circuit are connected with comparer by step-down, rectification, filtering respectively.
3, agricultural transmission line of electricity burglar alarm according to claim 2, it is characterized in that: said step-down, rectification, filtering circuit comprise the series circuit of dropping resistor and diode, the output termination capacitor of diode and the filtering circuit that resistance composes in parallel.
4, according to claim 1 or 2 or 3 described agricultural transmission line of electricity burglar alarms, it is characterized in that: connect the input end of driving circuit after the output terminal of each comparer joins, the output terminal of driving circuit connects shared warning circuit by relay J.
5, according to claim 1 or 2 or 3 described agricultural transmission line of electricity burglar alarms, it is characterized in that: power supply master switch K
1In be connected by switch between input end and the output terminal of A phase.
6, according to claim 1 or 2 or 3 described agricultural transmission line of electricity burglar alarms, it is characterized in that: standard signal generation circuit comprises transformer, rectification circuit and mu balanced circuit.
7, agricultural transmission line of electricity burglar alarm according to claim 6, it is characterized in that: the input end of standard signal generation circuit is connected to master switch K by switch
1Input end.
8, agricultural transmission line of electricity burglar alarm according to claim 7 is characterized in that: power supply master switch K
1Pass through double-break switch K between the input end of A phase and the output terminal
2Connect, it connects with A output terminal and standard signal generation circuit mutually respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00256491 CN2453453Y (en) | 2000-11-22 | 2000-11-22 | Anti-theft and alrming devicefor agricultural power line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00256491 CN2453453Y (en) | 2000-11-22 | 2000-11-22 | Anti-theft and alrming devicefor agricultural power line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2453453Y true CN2453453Y (en) | 2001-10-10 |
Family
ID=33613198
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00256491 Expired - Fee Related CN2453453Y (en) | 2000-11-22 | 2000-11-22 | Anti-theft and alrming devicefor agricultural power line |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2453453Y (en) |
-
2000
- 2000-11-22 CN CN 00256491 patent/CN2453453Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |