CN2200820Y

CN2200820Y - Watt-hour meter with anti-steal, anti-leak and anti-touch electric

Info

Publication number: CN2200820Y
Application number: CN 94210720
Authority: CN
Inventors: 陈潮; 叶忠
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-05-04
Filing date: 1994-05-04
Publication date: 1995-06-14
Anticipated expiration: 2004-05-04

Abstract

The utility model relates to a watt-hour meter with anti-steal, anti-leak and anti-touch electric, composed of a watt-hour circuit a zero sequence current signal detection circuit, a disturbing wave filter circuit, an enlarging and delay circuit and an operating mechanism circuit. Because the watt-hour meter circuit is connected with an accelerating metering circuit and the zero sequence current signal detection circuit is cascaded with an asymmetrical element, the utility model, in addition, to preventing all the electric larceny behaviors, not only has the anti-steal, anti-leak and anti-touch electric functions, but also has the advantages of high sensibility, high anti-interference capability, non-perishable appearing false actions, simple structure, cheap fabrication cost, etc.

Description

Watt-hour meter with anti-steal, anti-leak and anti-touch electric

This is practical to relate to a kind of watt-hour meter, particularly a kind of watt-hour meter that can anti-electricity-theft anticreep protection against electric shock.

When electrical equipment enters huge numbers of families, power supply department is faced with different problems separately with electricity consumer, on the one hand because the stealing of some illegal electricity consumers, power supply department will be suffered huge direct economic loss every year, and in electric power supply originally not enough today, electricity filching person is usually abused electric power again, cause the electric power burden, the unstable aggravation of power network, power equipment and electrical appliance are aging to quicken, and causes immeasurable indirect economic loss; Electricity consumer then owing to make electrical appliance in a large number, is paid close attention to the safety of electricity consumption more on the other hand, and aging electric leakage, the electric shock accidents of causing of electrical equipment inferior and electrical appliance occurs repeatedly.For this reason; people are anti-electricity-theft; anticreep; protection against electric shock is technical has done many effort; application number as up-to-date bulletin is 92231088.2; Granted publication number is the utility model patent of CN2132319Y: anti-electricity-theft anticreep electrical shock protection safety device; a kind of exactly collection prevents stealing; prevent to touch electric leakage and stealing displayed record in the comprehensive anti-electricity-theft device of one; it is by automatic control section; the time-delay part; electric leakage electric shock sampling thief; the stealing sampling thief; the stealing monitor; hookup; shielding line and stealing monitor are formed; this device is installed in the watt-hour meter outside; as stealing; when electric leakage or electric shock signal; the automatic control section of delaying time will be worked; in 0.1 second, stop power supply; automatic recovery of power supply after 0.5～5 fen kind of delaying time; if during the stealing signal; the stealing monitor will write down and show electricity filching behavior; thereby be the problem that power supply department and user have solved above-mentioned prison preferably; but because this device is contained in off-balancesheet; its circuit theory diagrams are shown in the A part of Fig. 1; B partly is a watt-hour meter circuit, when occur with I with

Short circuit, simultaneously with I ' with

' short circuit, because the complete symmetry of circuit can make this device lose function; When I and 4 short circuits occurring, when I ' carried out stealing with 2 short circuits simultaneously, also owing to the symmetry of circuit, this device was difficult to measure electricity filching behavior.Because circuit is all used bidirectional triode thyristor, make the circuit poor anti jamming capability to be prone to misoperation in addition.And for example application number is 87210003, notification number is the utility model patent of CN87210003U: anti-electricity-theft, protection against electric shock watt-hour meter, this watt-hour meter also has anti-electricity-theft electroshock-proof function, and entire circuit is contained in the table, the electrical connection schematic diagram of the elementary winding of its magnetic test coil as shown in Figure 2, when short circuit a1 and a2 occurring, when while short circuit a3 and a4, also the symmetry owing to this circuit makes this watt-hour meter be difficult to measure electricity filching behavior.

In order to overcome above-mentioned deficiency, the purpose of this utility model provides a kind of improved anti-electricity-theft anticreep protection against electric shock watt-hour meter, it can prevent all electricity filching behaviors and touch, leaky.

The purpose of this utility model realizes by following technical proposals.

Fig. 3 is a circuit block diagram of the present utility model, as shown in Figure 3, the utility model is by watt-hour meter circuit 1, zero sequence current signal testing circuit 2, power circuit 3, interference wave filtering circuit and amplification, delay circuit 4 and actuating mechanism circuit 5 are formed, include electric current winding L 1 in the major loop of watt-hour meter circuit 1, also be connected with an acceleration metering circuit simultaneously, zero sequence current signal testing circuit 2 comprises a zero sequence current mutual inductor T, between zero sequence current mutual inductor T and electric current winding L 1, be in series with asymmetric element, the input end of watt-hour meter circuit 1 links to each other with power supply, its output terminal links to each other with the input end of zero sequence current signal testing circuit 2, the output terminal of zero sequence current signal testing circuit 2 respectively with interference wave filtering circuit and amplification, delay circuit 4, power circuit 3 and actuating mechanism circuit 5 connect, power circuit 3 is transformed into the 24V direct current with the 220V alternating current and supplies with amplifying circuit, signal after amplifying is delivered to actuating mechanism circuit 5, actuating mechanism circuit 5 is given watt-hour meter circuit 1 by lead with signal feedback on the one hand, links to each other with electricity consumer on the other hand.

Because the utility model connects an acceleration metering circuit in watt-hour meter circuit; in the zero sequence current signal testing circuit, be connected with simultaneously asymmetric element; make the utility model except preventing all electricity filching behaviors, having the function of opposing electricity-stealing and touch, the earth leakage protection, also have highly sensitive, strong anti-interference performance, be not prone to misoperation, advantage such as simple in structure, cheap.

Below will be described in further detail the utility model by specific embodiment.

Fig. 1 is the circuit theory diagrams of anti-electricity-theft anticreep electrical shock protection safety device.

Fig. 2 is the circuit theory diagrams of anti-electricity-theft protection against electric shock watt-hour meter.

Fig. 3 is the circuit block diagram of anti-electricity-theft anticreep protection against electric shock watt-hour meter.

Fig. 4 is one of circuit theory diagrams of anti-electricity-theft anticreep protection against electric shock watt-hour meter.

Fig. 5 be anti-electricity-theft anticreep protection against electric shock watt-hour meter circuit theory diagrams two.

As Fig. 4, shown in Figure 5, include electric current winding L 1 in the major loop of watt-hour meter circuit 1, in the major loop of watt-hour meter circuit 1, connect an acceleration metering circuit as shown in Figure 4, this acceleration metering circuit is made of electric current winding L 2, electric current winding L 2 is on electric current winding L 1, identical and the number of turn of the line of electric current winding L 2 footpath and electric current winding L 1 is its 2 times, and after 1 reversal connection of electric current winding L, electric current winding L 2 is serially connected on another line of major loop; As shown in Figure 5, this acceleration metering circuit is made up of capacitor C 7, resistance R 15 and electric current winding L 4, connect with electric current winding L 4 in capacitor C 7 and resistance R 15 backs in parallel, electric current winding L 4 is on electric current winding L 1, one end of capacitor C 7 links to each other with the output terminal 4 of watt-hour meter, and an end of electric current winding L 4 links to each other with the normally open contact lead end of single group switch relay J; This acceleration metering circuit can produce positive moment, quickens the accumulative total speed of power consumption.The input end of watt-hour meter circuit 1 i.e. 1,3 ends links to each other with power supply, and its output terminal links to each other with the input end of zero sequence current signal testing circuit 2.Zero sequence current signal testing circuit 2 is made up of zero sequence current mutual inductor T and asymmetric element, asymmetric element connected in series is between electric current winding L 1 and zero sequence current mutual inductor T, asymmetric element is to be used for producing the asymmetric of circuit at this circuit, make when watt-hour meter 1 end and 2 ends and 3 ends and 4 ends while during by the electricity filching person short circuit, two electric currents that flow through the watt-hour meter major loop produce asymmetric, comprise the asymmetric of amplitude and phase place, make zero-sequence current non-vanishing, asymmetric as shown in Figure 4 element diode D2, D3 reverse by two and that connect form; As shown in Figure 5, asymmetric element is an inductance L 3.The output terminal of zero sequence current signal testing circuit 2 respectively with interference wave filtering circuit and amplification, delay circuit 4, power circuit 3 and actuating mechanism circuit 5 connect, the interference wave filtering circuit is to be used for elimination interference wave signal, make that the utility model antijamming capability is strong, be difficult for producing misoperation, it is by capacitor C 3, C4, C6 and resistance R 3, R4 forms, amplifying circuit is by operational amplifier A 1, A2 and triode TR2 form, delay circuit is by diode D1, resistance R 10, R11, R12, R13, R14, capacitor C 6 and operational amplifier A 2, A3 forms, power circuit 3 is by resistance R 1, capacitor C 1, C2, rectifier bridge BR, stabilivolt Z and triode TR1 form, actuating mechanism circuit 5 is made up of single group switch relay J, the output terminal of its major loop is the output terminal of watt-hour meter, it is 2 of watt-hour meter, 4 ends, power circuit 3 is transformed into the 24V direct current with the 220V alternating current and supplies with amplifying circuit, signal after amplifying drives hummer BE warning and single group switch relay J action, the middle contact lead end of single group switch relay J links to each other with zero sequence current mutual inductor T, its normally closed interlock lead end links to each other with the output terminal 2 of watt-hour meter, its principle of work is: (1) is when normal electricity consumption, two size of current that flow through zero sequence current mutual inductor T major loop equate, phase place is opposite, zero-sequence current is zero, and single group switch relay J is normally closed; The effective turn of current watt-hour meter winding is constant, and watt-hour meter normally adds up power consumption.When undesired signal, the multiple filter elimination that undesired signal will be made up of capacitor C 3, resistance R 3, R4 and capacitor C 4, C6 makes watt-hour meter when extraneous normal occlusion separating brake high-power electric appliance, misoperation do not occur.(2) when electric shock or electric leakage take place, zero-sequence current is non-vanishing, zero sequence current mutual inductor T induces zero sequence current signal, this signal is through operational amplifier A 1, after A2 and triode TR2 amplify, drive buzzer warning and single group switch relay J action, cut off live wire, stop external power supply, at this moment be cut off with ignition line, zero-sequence current also disappears thereupon, but because the effect of delay circuit still makes relay J stay open a period of time, during this period, electricity consumer can be removed electric leakage electrical equipment or break away from and get an electric shock, and when circuit finished time-delay, relay was got back to X contact, be normally off, circuit restores electricity.(3) when stealing takes place: I. during the ground connection stealing, the reaction that watt-hour meter has been done with touch the same when leaking electricity, relay constantly opens and closes, and causes the electricity filching person can't stealing.II. when generation is carried out stealing to watt-

hour meter

1,2 end short circuits, the zero sequence current signal that produces is through amplifying the single group of rear drive switch relay J, make it be in the Y contact, be open mode, at this moment, when adopting Fig. 4 circuit, the electric current that produces the electric current winding L 1 of negative moment is 0, and the number of turn is the L1 twice, and the electric current of the winding L 2 of generation positive moment is normal, and watt-hour meter adds up power consumption with 2 times normal speed; When adopting Fig. 5 circuit, electric current winding L 4 turn-on current produce the accumulative total speed that positive moment is quickened power consumption.III. when taking place with 1 end and 2 ends, when 3 ends and 4 end short circuits because asymmetric element inductance L 3 or diode D2, the generation of major loop two electric currents is differed in the effect of D3 or thereby difference in magnitude produces stronger zero sequence current signal, signal is in open mode through amplifying rear drive buzzer warning and relay J, at this moment when adopting Fig. 4 circuit, the electric current of electric current winding L 1 be 0 and electric current winding L 2 because the shunting of extraneous shorting stub reduces its electric current that flows through, but because its number of turn is 2 times of electric current winding L 1, and the electric current of being shunted is often less than 1/2 main circuit current, make the ampere turns of electric current winding L 2 still surpass total ampere turns when normally moving, make watt-hour meter still can more normally measure fireballing speed accumulative total power consumption, when adopting Fig. 5 circuit, electric current winding L 4 can produce additional positive moment, quicken the accumulative total speed of power consumption, change the number of turn and the capacitor C 7 of electric current winding L 4, the value of resistance R 15, can give electricity filching person with in various degree punitive accumulative total power consumption, to reach anti-electricity-theft, the purpose of opposing electricity-stealing.

Claims

1, a kind of anti-electricity-theft anticreep protection against electric shock watt-hour meter, it is by watt-hour meter circuit (1), zero sequence current signal testing circuit (2), power circuit (3), interference wave filtering circuit and amplification, delay circuit (4) and actuating mechanism circuit (5) are formed, include electric current winding (L1) in the major loop of watt-hour meter circuit 1, zero sequence current signal testing circuit (2) comprises a zero sequence current mutual inductor (T), the input end of watt-hour meter circuit (1) links to each other with power supply, its output terminal links to each other with the input end of zero sequence current signal testing circuit (2), the output signal of zero sequence current signal testing circuit (2) is input to interference wave filtering circuit and amplification respectively, delay circuit (4), power circuit (3) and actuating mechanism circuit (5), interference wave filtering circuit and amplification, delay circuit (4) by power circuit (3) to its power supply, its output signal is input to actuating mechanism circuit (5), power circuit (3) is transformed into the 24V direct current with the 220V alternating current and supplies with amplifying circuit, signal after amplifying is delivered to actuating mechanism circuit (5), actuating mechanism circuit (5) is given watt-hour meter circuit (1) by lead with signal feedback on the one hand, link to each other with electricity consumer on the other hand, it is characterized in that connecting in the watt-hour meter circuit (1) an acceleration metering circuit, one asymmetric element is arranged in the zero sequence current signal testing circuit (2), and it is series between electric current winding (L1) and the zero sequence current mutual inductor (T).

2, anti-electricity-theft anticreep protection against electric shock watt-hour meter according to claim 1, it is characterized in that quickening metering circuit and be a line footpath with reversal connection the identical and number of turn of electric current winding (L1) be the electric current winding (L2) of its twice, it is connected on another line of major loop of watt-hour meter circuit (1).

3, anti-electricity-theft anticreep protection against electric shock watt-hour meter according to claim 1, it is characterized in that quickening metering circuit is made up of electric capacity (C7) resistance (R15) and electric current winding (L4), connect with electric current winding (L4) in electric capacity (C7) and resistance (R15) back in parallel, electric current winding (L4) is on electric current winding (L1), one end of electric capacity (C7) links to each other with the output terminal of watt-hour meter, and an end of electric current winding (L4) links to each other with the normally open contact lead end of single group switch relay (J).

4, anti-electricity-theft anticreep protection against electric shock watt-hour meter according to claim 1 is characterized in that asymmetric element is an inductance (L3)

5, anti-electricity-theft anticreep protection against electric shock watt-hour meter according to claim 1, it is characterized in that asymmetric element by two oppositely and the diode (D2, D3) that connects form.

6, anti-electricity-theft anticreep protection against electric shock watt-hour meter according to claim 1 is characterized in that the interference wave filtering circuit is made up of electric capacity (C3, C4, C6) and resistance (R3, R4).

7, anti-electricity-theft anticreep protection against electric shock watt-hour meter according to claim 1 is characterized in that amplifying circuit is made up of operational amplifier (A1, A2) and triode (TR2).

8, anti-electricity-theft anticreep protection against electric shock watt-hour meter according to claim 1 is characterized in that delay circuit is by diode (D1) and resistance (R10, R11, R13, R14), and electric capacity (C6) and operational amplifier (A2, A3) are formed.

9, anti-electricity-theft anticreep protection against electric shock watt-hour meter according to claim 1 is characterized in that actuating mechanism circuit is made up of single group switch relay (J).