CN2387647Y

CN2387647Y - Device for preventing fraudulent use of electricity

Info

Publication number: CN2387647Y
Application number: CN 99233930
Authority: CN
Inventors: 刘在能
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-08-20
Filing date: 1999-08-20
Publication date: 2000-07-12
Anticipated expiration: 2009-08-20

Abstract

The utility model relates to a device for preventing fraudulent use of electricity, which is composed of a DC filter circuit, an oscillating circuit, a control circuit, an electronic switch, an actuating mechanism, a signal sensing circuit, etc. The sensing circuit of the utility model comprises three technical proposals, two mutual inductors which are positioned at the front and the back of an electric meter are adopted, which is characterized in that the control is realized by the unbalance of signals which is caused by fraudulent use of electricity; a zero sequence current mutual inductor is adopted, which is characterized in that the control is realized by the balance of signals which is caused by the fraudulent use of the electricity; an oscillator and a current coil of the electric meter are adopted, which is characterized in that the control is realized by changes of resistance of the current coil of the electric meter to oscillating frequencies. The utility model which can prevent different fraudulent use of the electricity has the advantages of simple structure, convenient connection, no changes in the electric meter, low cost, full functions, and stable and reliable performance.

Description

Device against charge evasion

The utility model belongs to a kind of electrical control equipment of using, be particularly suitable for being used for stopping multiple without the electric energy meter metering electricity filching behavior of electricity consumption.

Electricity filching behavior without electric energy meter metering electricity consumption happens occasionally in urban and urual areas of whole country at present, and the electricity filching means of employing also is varied, and the most frequently used has: wiring stealing before the table, a fiery ground stealing, dismounting hook stealing and off-balancesheet shunting stealing etc.The generation of these behaviors has increased unsafe factor on the one hand, has upset normal supply order on the other hand, also causes enormous economic loss to state and collective simultaneously.Though currently occurred polytype controller for preventing illegal use of electricity on the market, but because itself 26S Proteasome Structure and Function is limit, wiring complexity and need are changed reasons such as electric energy meter in addition, and change electric energy meter is to violate the power supply department administrative provisions, so its effect is often unsatisfactory, cause these controller for preventing illegal use of electricity, also do not play its due effect at present, be i.e. also not penetration and promotion application as yet.

The purpose of this utility model, be existing controller for preventing illegal use of electricity is further improved and improves, provide a kind of wiring simple, need not change electric energy meter, and really can stop to show preceding stealing, the device that hook stealing and off-balancesheet are shunted multiple electricity filching behaviors such as stealing is removed in one a fiery ground stealing.

The utility model mainly comprises the following three kinds of technical schemes based on same inventive concept:

Scheme one: a kind of device against charge evasion, has the DC filtering circuit, oscillating circuit, control circuit, electronic switch, compositions such as actuator and signal sensing circuit, the output of signal sensing circuit and the input of electronic switch join, the output of electronic switch and the input of control circuit join, actuator comprises relay " K ", and it is connected on the output of control circuit, the normally-closed contact K of relay " K " _1-1, to be connected on the ac circuit live wire be instrument transformer T ₃Former limit L ₆Output, electronic switch is by IC ₁, V ₁Deng composition, its signal sensing circuit is by instrument transformer T ₁, T ₃, diode VD ₁₁, resistance R ₈, capacitor C ₁₁Deng composition, instrument transformer T ₁Primary coil L ₁With instrument transformer T ₃Primary coil L ₆Be connected on the live wire of the ac power supply circuit before and after the electric energy meter two instrument transformer T respectively ₁, T ₃Secondary coil L ₂And L ₇Induced signal oppositely after the stack, by diode VD ₁₁Be added on IC ₁Control end " 5 " pin on.

Scheme two: other parts are identical with scheme one, different just its signal sensing circuits, signal sensing circuit comprises zero sequence current mutual inductor T ₂, diode VD ₁, resistance R ₁, capacitor C ₁, and time-base circuit IC ₂Deng.Zero sequence current mutual inductor T ₂Two primary coil L ₃, L ₄The live wire that is connected on ac power supply circuit respectively is on 1,2 ends of electric energy meter, its secondary L ₅With diode VD ₁Negative terminal connect VD ₁Positive pole then with time-base circuit IC ₂" 4 " pin join.

Scheme three: other parts are identical with scheme two, and different is signal sensing circuit.Its signal sensing circuit is by time-base circuit IC ₂, the current coil of electric energy meter, triode V ₂, resistance R _9-10, capacitor C ₁₀, C _12-14, diode VD _4-6Deng composition, time-base circuit IC ₂By the output of " 3 " pin, and and C ₁₀An end link to each other C ₁₀The other end then with C _13-14An end join C ₁₃The other end then with diode VD ₅, VD ₆Link to each other C ₁₄The other end and 1 pin of electric energy meter join VD ₅Anode then with resistance R _9-10, capacitor C ₁₂An end link to each other R ₉Another termination triode V ₂Base stage, triode V ₂Collector electrode meet diode VD ₄Negative terminal, its positive pole meets electronic switch IC ₁Control end " 5 " pin, this programme is the further extension on the basis of

scheme

1,2, makes it under the situation of not changing electric energy meter, possesses the behavior that prevents to shunt stealing (being about to

electric energy meter

1,2 end short circuits)

The comparison of the utility model and existing all kinds of anti-electricity-theft control device, have simple in structure, easy-to-connect, need not to change electric energy meter, and cost is low, and function is complete, characteristics such as dependable performance: accompanying drawing has provided the be blended together embodiment of the overall technical architecture used of above-mentioned three kinds of schemes.

Fig. 1 is the device against charge evasion schematic diagram

Below in conjunction with accompanying drawing the utility model is further described:

A kind of device against charge evasion, has the DC filtering circuit, oscillating circuit, electronic switch, control circuit, actuator and signal sensing circuit, the output of signal sensing circuit links to each other with the input of electronic switch, the output of electronic switch links to each other with the input of control circuit, actuator comprises relay " K ", is connected on the output of control circuit, the normally-closed contact K of relay " K " _1-1Being connected on the ac circuit live wire is instrument transformer T ₃L ₆Output, electronic switch is by IC ₁, V ₁Deng composition, the DC filtering circuit is by transformer T ₄, rectifier diode VD _7-10And filter capacitor C ₉Deng composition, signal sensing circuit of the present utility model comprises the combination of following three kinds of schemes.

Scheme 1: its signal sensing circuit comprises instrument transformer T ₁, T ₃With diode VD ₁₁, resistance R ₈, capacitor C ₁₁Form instrument transformer T ₁Primary coil L ₁With instrument transformer T ₃Primary coil L ₆Be connected on the live wire of the ac power supply circuit before and after the electric energy meter two instrument transformer T respectively ₁, T ₃Secondary coil L ₂, L ₇Induced signal inversely add after all by diode VD ₁₁Be added on electronic switch IC ₁" 5 " pin on.

Scheme 2: its signal sensing circuit comprises zero sequence current mutual inductor T ₂With diode VD ₁Zero sequence current mutual inductor T ₂Two primary coil L ₃, L ₄, be connected on respectively on the live wire of ac power supply circuit, promptly on the input and output side of electric energy meter current coil.Its secondary coil of wire L ₅Then with diode VD ₁Negative terminal link to each other diode VD ₁Anode then with time-base circuit IC ₂" 4 " pin join.

Scheme 3: its signal sensing circuit is by time-base circuit IC ₂, electric energy meter current coil, triode V ₂, resistance R _9-10, capacitor C _12-14, diode VD _4-5Deng composition, time-base circuit IC ₂By the output of " 3 " pin, and and C ₁₀An end link to each other C ₁₀The other end then with C ₁₃, C ₁₄An end join C ₁₃The other end then with two utmost point VD ₅Negative pole and VD ₆Positive pole join C ₁₄Another termination electric energy meter " 1 " end.VD ₅Positive terminating resistor R _9-10, capacitor C ₁₂An end, R ₉Another termination triode V ₂Base stage, V ₂Collector electrode meet diode VD ₄Negative terminal and resistance R ₅An end.VD ₄just terminate at electronic switch IC ₁" 5 " pin on.

Control circuit of the present utility model can adopt ic chip ₁And the auxiliary circuit composition, integrated package can be selected TWH8778 for use and insert a triode V on its control end " 5 " pin and " 1 " pin ₁And resistance R ₄, capacitor C ₅Deng, form delay circuit, delay time can be set at the time of the required usefulness of high-grade electric equipment such as protection refrigerator, is generally: 3-5 minute.

For strengthening deixis of the present utility model, can meet a light-emitting diode VD again at the output of control circuit ₃, light-emitting diode VD ₃With resistance R ₂Series connection is to realize the suggesting effect of light signal.

Operation principle of the present utility model is as follows:

1, wiring stealing (a fiery ground stealing) before the table: under the normal condition, flow through instrument transformer T ₁Secondary coil L ₂With instrument transformer T ₃Secondary coil L ₇In electric current, equal and opposite in direction, direction is opposite, so IC ₁Control end " 5 " pin be low level, then IC ₁End, relay place release condition, i.e. normal power supply, indicator light extinguishes.

In case when a stealing or a fiery ground electricity filching behavior take place before the table, flow through T ₁L ₂And T ₃L ₇In electric current, direction is opposite, but differs in size, then IC ₁" 5 " pin be high level, IC ₁Conducting, " K " gets electronic work, blocks power supply, and simultaneously by light-emitting diode VD ₂Luminous indication.After electricity filching behavior is corrected, through resistance R _3-4, capacitor C ₅With triode V ₁After forming the definite delay time of delay circuit, could recover automatically to send.

2, remove the hook stealing: under normal circumstances flow through zero sequence current mutual inductor T ₂Primary coil L ₃, L ₄Middle its direction of electric current is opposite, but differs in size, i.e. I ₃＞I ₄(because the potential winding of electric energy meter has shunting) is so T ₂Secondary coil L ₅Output is arranged, cause IC ₂" 4 " pin get electric work, its " 3 " pin output high level, triode V ₂So conducting is IC ₁" 5 " pin be low level, i.e. IC ₁End, relay " K " is in release condition, i.e. normal power supply, light-emitting diode VD ₂Extinguish.In case the electric energy meter hook is removed, and then flows through the primary coil L of zero sequence current mutual inductor ₃, L ₄In size of current equate that direction is opposite, so its secondary coil L ₅Middle no-output voltage, IC ₂" 4 " pin dead electricity failure of oscillation, so IC ₂" 3 " pin output low level, triode V ₂End.IC ₁" 5 " pin be high level, i.e. IC ₁Conducting, relay " K " gets electric adhesive, blocks power supply, simultaneously light-emitting diode VD ₂Luminous indication after electricity filching behavior is corrected, through the delay time of determining, could recover to send automatically.

3, shunting stealing: under the situation of normal power supply, IC ₂Be in oscillatory regime, i.e. " 3 " pin output high level is because the current coil of electric energy meter has very high impedance to this frequency of oscillation, so this high level is added in V ₂Base stage, cause V ₂Conducting, IC at this moment ₁" 5 " pin be low level, i.e. IC ₁End, relay " K " is located release condition, i.e. normal power supply.In case the electric energy meter current coil by short circuit, is promptly shunted, so IC ₂The high level of " 3 " pin output is gone into ground by the short circuit of electric energy meter current coil, then triode V ₂Base stage be low level, V ₂End IC ₁" 5 " pin be high level, then IC ₁Conducting, relay " K " gets electric adhesive, blocks power supply, and lumination of light emitting diode indication simultaneously to show stealing, after electricity filching behavior is corrected, could recover to send through the delay time of stipulating automatically.

Claims

1, a kind of device against charge evasion, has the DC filtering circuit, oscillating circuit, electronic switch, control circuit, actuator and signal sensing circuit etc., the output of signal sensing circuit and the input of electronic switch join, the output of electronic switch and the input of control circuit join, and actuator comprises relay " K ", and it is connected on the output of control circuit, the normally-closed contact K of relay " K " _1-1Be connected on the live wire of ac power supply circuit, i.e. instrument transformer T ₃Former limit L ₆Output, electronic switch is by triode V ₁Deng the delay circuit of forming, it is characterized in that: signal sensing circuit is by instrument transformer T ₁, T ₃, diode VD ₁₁, resistance R ₈, capacitor C ₁₁Deng composition, instrument transformer T ₁Primary coil L ₁With instrument transformer T ₃Primary coil L ₆Be connected on the live wire of front and back ac power supply circuit of electric energy meter i.e. electric energy meter live wire input and output side, two instrument transformer T respectively ₁, T ₃Secondary coil L ₂, L ₇Induced signal oppositely after the stack, again by diode VD ₁₁Be added on IC ₁" 5 " pin on.

2, a kind of device against charge evasion: have DC filtering circuit, oscillating circuit, electronic switch, control circuit, actuator and signal sensing circuit etc., the output of its signal sensing circuit and the input of electronic switch join, and the output of electronic switch and the input of control circuit join.Actuator comprises relay " K ", is connected on the output of control circuit, the normally-closed contact K of relay " K " _1-1Be connected on the live wire of ac power supply circuit, i.e. instrument transformer T ₃Primary coil L ₆Output, electronic switch is by triode V ₁Deng the delayer of forming, it is characterized in that: signal sensing circuit comprises zero sequence current mutual inductor T ₂With diode VD ₁Deng, zero sequence current mutual inductor T ₂Two primary coil L ₃, L ₄, all be connected on the Alternating Current Power Supply line the i.e. input and output side of electric energy meter current coil, its secondary coil L ₅With diode VD ₁Negative pole link to each other VD ₁Positive pole meet fixed oscillator IC ₂" 4 " pin, under normal circumstances, for oscillator provides oscillation source, this fixed oscillator is by integrated circuit (IC) ₂And auxiliary circuit is formed IC ₂Be the NE555 type, its output " 3 " passes through capacitor C ₁₀, C ₁₄Link with the input of electric energy meter current coil, the output of fixed oscillator also is connected to a triode V ₂And the reverser of auxiliary circuit composition, its output is by diode VD ₄Open IC with electronics ₁" 5 " pin link.

3, device against charge evasion according to claim 2 is characterized in that: fixed oscillator IC ₂Output " 3 " pin, pass through capacitor C ₁₀, C ₁₄Join with the input of electrical energy meter electricity energy coil, the electric current of this frequency is gripped by the resistance of electric energy meter current coil.