CN2879200Y

CN2879200Y - Anti-theft leakage-proof device for electricity meter

Info

Publication number: CN2879200Y
Application number: CN 200620049899
Authority: CN
Inventors: 刘浩
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-01-24
Filing date: 2006-01-24
Publication date: 2007-03-14
Anticipated expiration: 2016-01-24

Abstract

The utility model discloses an ammeter for preventing electricity-burgling and creepage, comprising a current transformer, a filter circuit, a No.1 control switch, a No.2 control switch, a timer and a relay. Input zero line and input live wire of the ammeter go through the current transformer whose output connects with the filter circuit. The output of the filter circuit connects with the control end of the No.1 control switch; the output of the No. l control switch connects with the timer circuit; the output of the timer circuit connects with the control end of the No. 2 control switch; the output terminal of the No. 2 control switch connects with the relay coil in series; the constant close switch of the relay connects with the output zero line and output live wire of the ammeter in series. The utility model is characterized in simple structure, stable and reliable operation, and capable of preventing electricity-burgling, at the same time spotting creepage to thus prevent heavy loss.

Description

The anti-electricity-theft anticreeper of ammeter

Technical field

The utility model relates to the anti-electricity-theft anticreeper of a kind of ammeter.

Background technology

Existing ammeter all has only the tally function of used electric degree number, and the inlet wire of ammeter, leading-out terminal all expose outside, and the user is easy to stealing like this, causes tremendous loss to country every year in China's stealing.Existing ammeter does not have anti-creeping function yet simultaneously, and electric energy is not only wasted in electric leakage, also causes serious security incident easily.

The utility model content

The purpose of this utility model is at the problems referred to above, provides a kind of ammeter simple in structure, that cost is low anti-electricity-theft anticreeper.

For realizing above-mentioned purpose, the technical solution of the utility model is: comprise current transformer, filtering circuit, first gauge tap, second gauge tap, chronotron, relay, the input zero line of described ammeter, input live wire pass current transformer, the output of current transformer connects filtering circuit, the output of filtering circuit connects the control end of first gauge tap, the output of first gauge tap connects the control end of second gauge tap, the coil of the output terminal serial connection relay of second gauge tap, the normally closed switch of relay are serially connected with output zero line, the output live wire of ammeter.

In the anti-electricity-theft anticreeper of above-mentioned ammeter, also comprise delay circuit, delay circuit is serially connected with between first gauge tap and second gauge tap.

The beneficial effects of the utility model: the utility model passes current transformer with input zero line, the input live wire of ammeter, the electric current that is detected the input power supply by current transformer changes, the silicon controlled control end is controlled in the output of current transformer after filtering, when stealing or electrical leakage occurring, the controllable silicon conducting, the relay normally closed switch disconnects, and cuts off the user, till problem solves.Can prevent the generation of stealing electricity phenomenon so effectively, also can in time find the generation of electrical leakage situation simultaneously, avoid resulting in greater loss.

Be further described below in conjunction with the structure and the principle of work of the drawings and specific embodiments utility model.

Description of drawings

Fig. 1 is a theory diagram of the present utility model.

Fig. 2 is the electrical schematic diagram of the utility model embodiment.

Embodiment

Referring to Fig. 1, the utility model comprises current transformer, filtering circuit, first gauge tap, second gauge tap, delay circuit, relay, the input zero line of described ammeter, the input live wire passes current transformer, the output of current transformer connects filtering circuit, the output of filtering circuit connects the control end of first gauge tap, the output of first gauge tap connects delay circuit, the output of delay circuit connects the control end of second gauge tap, the coil of the output terminal serial connection relay of second gauge tap, the normally closed switch of relay is serially connected with the output zero line of ammeter, the output live wire.

Referring to Fig. 2, Fig. 2 is the electrical schematic diagram of the utility model embodiment.1,3 are respectively ammeter input live wire, input zero line among the figure, 2,4 be respectively circuit output live wire, zero line, the input live wire of ammeter, input zero line pass current transformer L1, its principle of work is as follows: normally with under the electricity condition, the current balance type of input live wire, input zero line, current transformer L1 is output not.When stealing or electrical leakage occurring, the input live wire, the current imbalance of input zero line, current transformer L1 has output, its output is through resistance R 1, capacitor C 1, C2, diode D1 forms the trigger voltage that filter rectifier provides controllable silicon Q1, controllable silicon Q1 conducting, direct current through integrated package 7805 rectifications flows through controllable silicon Q1 through photoelectrical coupler Q2, direct current is through resistance R 4 simultaneously, photoelectrical coupler Q2 provides bias voltage for triode Q3, triode Q3, the Q4 conducting, the normally closed switch K1 of relay J, K2 disconnects, the user is de-energized, the delay capacitor C5 charging that simultaneously its base stage of triode Q4 is connect in this process, after relay J disconnects, current transformer L1 no-output, controllable silicon Q1 disconnects, triode Q3 disconnects because of no bias voltage, triode Q4 provides bias voltage to continue conducting by capacitor C 5, capacitor C 5 descends because of sparking voltage, when the voltage of capacitor C 5 during less than the cut-in voltage of triode Q4, triode Q4 ends, the relay J closure, restore electricity, as long as stealing or electrical leakage do not solve, relay constantly disconnects, adhesive can't normal power supply.

In the said process, triode Q4 keep ON time by capacitor C 5 discharge and recharge time constant decision, the value that changes capacitor C 5, resistance R 9 can change delay time.

Claims

1, the anti-electricity-theft anticreeper of a kind of ammeter, comprise current transformer, filtering circuit, first gauge tap, second gauge tap, chronotron, relay, it is characterized in that: the input zero line of described ammeter, input live wire pass current transformer, the output of current transformer connects filtering circuit, the output of filtering circuit connects the control end of first gauge tap, the output of first gauge tap connects the control end of second gauge tap, the coil of the output terminal serial connection relay of second gauge tap, the normally closed switch of relay are serially connected with output zero line, the output live wire of ammeter.

2, the anti-electricity-theft anticreeper of ammeter according to claim 1 is characterized in that: comprise that also delay circuit, delay circuit are connected in series between first gauge tap and second gauge tap.