CN2227840Y

CN2227840Y - Current sneaking-proof device for electrometer

Info

Publication number: CN2227840Y
Application number: CN 94243629
Authority: CN
Inventors: 董飞
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-10-21
Filing date: 1994-10-21
Publication date: 1996-05-22
Anticipated expiration: 2004-10-21

Abstract

The utility model relates to an anti-steal device of a watt-hour meter. The existing anti-steal device of an electricity meter has the deficiencies that the electricity stealing behavior of one line one ground below the meter can not be eliminated and the existing anti-steal device of an electricity meter can not automatically reset after the power is cut off. The anti-steal device of a watt-hour meter is composed of a testing circuit composed of a zero sequence current transformer, a bridge rectifier circuit, etc., an executive circuit composed of thyristor, a relay, etc., a time delay reset circuit composed of a unipolar transistor, resistor and capacitance and a power circuit composed of a capacitance-resistance pressure reducing circuit, a bridge rectifier circuit, etc. The anti-steal device of a watt-hour meter has the automatic monitoring function, the time delay reset function, etc. The anti-steal device of a watt-hour meter can efficiently eliminate all electricity stealing behaviors.

Description

Arrangement on watt-hour meter for avoiding fraudulent use

The utility model relates to a kind of arrangement on watt-hour meter for avoiding fraudulent use.

Existing watt-hour meter (hereinafter to be referred as ammeter) anti-electricity-theft device, the multi-functional anti-electricity-theft ammeter as Jiangdu, Jiangsu Province ammeter factory produced in 93 years mainly exists following 2 weak points; The first, can not stop electricity filching behavior fully, electricity filching person still can be used the mode stealing on " line one ground " under table; Second, can not be after the outage from horizontal reset, after the stealing outage took place, circuit also was in off-position always, desires to make circuit to restore electricity, then must make the silicon controlled anode voltage is zero (zero cross signal is promptly arranged), reach this requirement, power supply department is had a power failure, or professional electricity consumption personnel call charged disconnection ammeter inlet wire, this gives the user, and especially the power supply management personnel have brought great inconvenience.Thereby this anti-electricity-theft ammeter is difficult to promote in actual applications.

The purpose of this utility model provides and a kind ofly can more effectively prevent stealing, and has the novel anti-electricity-theft device of time-delay reset function, thereby has overcome the deficiencies in the prior art part.

For achieving the above object, the technical scheme that the utility model adopted is to set up one section time-delay reset circuit and an execution relay in the anti-electricity-theft device (circuit) at original anti-electricity-theft ammeter.For realizing this programme, formation of the present utility model is; It comprises one section by zero sequence current mutual inductor, bridge rectifier circuit, two electric capacity and the testing circuit that resistance is formed, the power circuit of being made up of resistance-capacitance depressurization circuit, bridge rectifier circuit and electric capacity is by controllable silicon, center-off device with carry out the executive circuit that relay is formed; The inlet wire of power circuit is connected in parallel on the ammeter inlet wire, and power circuit provides a direct supply by output line electrode line and negative line for executive circuit and time-delay reset circuit, and auxiliary reclay and controllable silicon are serially connected between electrode line and the negative line; The power lead that leads to the user passes zero sequence current mutual inductor, zero sequence current mutual inductor secondary between bridge rectifier circuit and in parallel resistance, two electric capacity are added in trigger electrode and negative electrode on the controllable silicon; In addition, also set up one section time-delay reset circuit between power circuit and the executive circuit, and one group of normally closed contact of execution relay in the executive circuit and auxiliary reclay is serially connected between electrode line and the negative line.

Time-delay reset circuit described in the utility model is by unipolar transistor, three resistance and two electric capacity are formed, a resistance string is connected between second base stage and electrode line of unipolar transistor, a resistance string is associated between the trigger electrode and electrode line of unipolar transistor, the another resistance string is associated between first base stage and silicon controlled sun plate of unipolar transistor, electric capacity be connected between the trigger electrode and silicon controlled anode of unipolar transistor after one group of normally closed contact of auxiliary reclay is in parallel, the another capacitances in series is between first base stage and negative line of unipolar transistor.

Two groups of normally opened contacts of execution relay of the present utility model are connected in the power lead that leads to the user.

Below in conjunction with accompanying drawing the utility model is done detailed explanation;

Accompanying drawing is circuit theory diagrams of the present utility model;

As shown in drawings, the utility model is made up of testing circuit [2], executive circuit [3], time-delay reset circuit [4] and power circuit [5]; Testing circuit is by zero sequence circuit mutual inductor [1], bridge rectifier circuit [11], capacitor C ₁, C ₂, C ₃And resistance R ₁Form, executive circuit is by controllable silicon SCR, auxiliary reclay J ₁With the execution relay J ₂Form, time-delay reset circuit is by unipolar transistor BT, resistance R ₂, R ₃, R ₄, capacitor C ₄, C ₅Form, power circuit is by resistance-capacitance depressurization circuit [7], bridge rectifier circuit [8] and capacitor C ₆Form; The inlet wire of power circuit [10] is connected in parallel on the ammeter inlet wire [12], such 220 volts AC power provides 24 volts of DC voltage by power circuit output line electrode line [9] and negative line [6] for executive circuit and time-delay reset circuit after power circuit step-down, rectification and filtering; Resistance R ₂Be connected on the second base stage b of unipolar transistor BT ₂And between the electrode line [9], resistance R ₄Be connected on the trigger electrode of unipolar transistor and between the electrode line capacitor C ₅One group of normally closed contact J with auxiliary reclay _1-2Be connected on the trigger electrode of unipolar transistor and between the silicon controlled anode K resistance R after the parallel connection ₃Be connected on the first base stage b of unipolar transistor ₁And between the silicon controlled anode, capacitor C ₄Be connected between first base stage and negative line of unipolar transistor; Auxiliary reclay J ₁And controllable silicon is serially connected between the electrode line and negative line of power supply; Carry out relay J ₂One group of normally closed contact J with auxiliary reclay _1-1Be serially connected between electrode line and the negative line; The power lead L that leads to the user ₁, L ₂Pass zero sequence current mutual inductor, the secondary L of mutual inductor ₃Through bridge rectifier circuit [11] and resistance R in parallel ₁, capacitor C ₁, C ₂, C ₃Be added between silicon controlled trigger electrode and the anode; Carry out relay J ₂Two groups of normally opened contacts (moving close) J _2-1, J _2-2Be connected in the power lead L that leads to the user ₁, L ₂In.

According to the inner structure of existing ammeter, with the circuit board that the utility model is made into, design in ammeter, the anti-electricity-theft ammeter of a kind of Multifunction.

The course of work of the present utility model is as follows:

The alternating voltage of 220V behind resistance-capacitance depressurization circuit [7] again through bridge rectifier circuit [8] rectification and capacitor C ₆Provide 24 volts DC voltage to executive circuit [3], time-delay reset circuit [4] after the filtering.When not having stealing electricity phenomenon or not having leaky on user's circuit, the zero-sequence transformer of testing circuit [1] is responded to the stream signal of not going on business, thereby the controllable silicon SCR of executive circuit [3] can not get trigger pip and is in cut-off state, auxiliary reclay J ₁Can not adhesive, its contact is in normally off (path), carries out relay J ₂Since obtain 24 volts of power supplys and adhesive, (contact is moving to be connected), and this device is powered to the user.When electricity filching behavior being arranged on user's the circuit or leaky is arranged, just induce hundreds of millivolts difference stream signal on the zero sequence current mutual inductor of testing circuit, this signal voltage is through L ₃, C ₁Behind the resonance by bridge rectifier circuit [11] rectification, become dc trigger signal after the filtering and be added between the silicon controlled trigger electrode G and negative wiring [6] of executive circuit, controllable silicon is triggered, and is become conducting state by cut-off state, the auxiliary reclay J that then is connected in series with controllable silicon ₁Obtain power supply and adhesive, its two groups of contact J _1-1, J _1-2All open a way (disconnection), so just cause: 1, carry out electrical relay and become release conditions because of the voltage of losing the job by attracting state, it is serially connected in the power lead L that leads to the user ₁, L ₂On two groups of contact J _2-1, J _2-2All disconnect, thereby stealing user's power supply is cut off, and promptly stops power supply; 2, after middle relay adhesive, another organizes contact J _1-2Disconnect, timing capacitor begins charging, thereby whole time-delay reset circuit is devoted oneself to work.After time-delay reset circuit work, through the e utmost point of 2-4 minute (adjustable) unijunction transistor power on voltage rise to its crest voltage just by by becoming conducting, then the voltage on the timing capacitor just is added to unijunction transistor b in moment ₁The resistance R of the utmost point ₃On, the positive pole of its voltage passes through b in moment ₁The capacitor C that extremely goes up ₄Be added on the silicon controlled negative electrode A, the negative pole of voltage then is added on the silicon controlled anode K, and concerning controllable silicon, this is a rp pulse voltage.At this moment, if stealing user's stealing electrical equipment has left circuit, then the negative pulse delivered at time-delay reset circuit of controllable silicon moment of reaching is become by (resetting) center-off device J by conducting ₁Lose its normally off of power up (release), contacting, carry out relay adhesive owing to energized, carry out the contact J of relay _2-1, J _2-2All connect, the user just restores electricity; If user's stealing electrical equipment still on the line or still have serious electric leakage on the circuit, then after time-delay reset circuit is sent negative pulse here, controllable silicon moment (less than 0.1 second) of conducting just because get back trigger pip and conducting, thereby entire circuit is still located power down mode.After stealing electrical equipment left circuit or leak current fault eliminating, controlled osmanthus just may be cut off, and auxiliary reclay discharges, and carries out the relay adhesive, and device just can be powered to the user again.Automatically cut off the power supply when so far the utility model has been finished user's stealing, cut off the power supply back time-delay, circuit monitored the process of not having on the line behind the electricity filching behavior again to the reset circuit power supply.

In sum, because this device has time-delay reset, automatic circuit monitoring function, so the utility model compared with prior art has following advantages:

1, this device can stop fully under the ammeter table all stealings (comprise a line one ground, The shunting ammeter current coil, voltage hook etc. in the anti-phase wiring following table), leaky.

2, after down circuitry, circuit has monitoring function under these device his-and-hers watches, such as the user Stealing electrical equipment still on the line, then this device can have a power failure always, until the stealing on the circuit Load is eliminated, and circuit just can restore electricity.

3, this device has the time-delay reset function, such as stealing user's stealing electrical equipment at electricity Can initiatively leave timely circuit after the road has a power failure, then circuit can be certainly after 2-4 minute in time-delay Its power supply of trend is delayed time and was protected on the one hand the household electrical appliance under the subscriber's meter in 2-4 minute, On the one hand to user's warning that has a power failure. Automatically reset and then reduced widely the electricity-management personnel Labour intensity, also made things convenient for simultaneously the user.

4, this device can be stipulated the electricity of novel 86 series of use easily with Electricity Department Show to form a complete production network out global function electric meter capable of avoiding fraudulent use of electricity of new generation, also can be to having at present in the society Measure other old-fashioned ammeter of very big DD14, DD15 etc. and change a social system, make just many merits of its tool Function that can be anti-electricity-theft.

5, this device does not change the installation mode of connection of original ammeter with after any ammeter cooperates, and does not also change the precision of former ammeter.

Claims

1, a kind of arrangement on watt-hour meter for avoiding fraudulent use, it comprises;

One section by zero sequence current mutual inductor [1], bridge rectifier circuit [11], capacitor C ₁, C ₂, C ₃With the cloudy R of electricity ₁The testing circuit of forming [2];

One section by resistance-capacitance depressurization circuit [7], bridge rectifier circuit [8] and capacitor C ₆The power circuit of forming [5];

One section by controllable silicon SCR, auxiliary reclay J ₁With the execution relay J ₂The executive circuit of forming [3];

The inlet wire [10] of power circuit [5] also is connected on the ammeter inlet wire [12], power circuit by output line electrode line [9] and negative line [6] for executive circuit [3] and time-delay reset circuit [4] provide a direct supply, auxiliary reclay J ₁And controllable silicon SCR is serially connected between electrode line [9] and the negative line [6]; The power supply L that leads to the user ₁, L ₂Pass zero sequence current mutual inductor [1], the secondary L of zero sequence current mutual inductor ₃With the resonance capacitor C ₁And after connecting, connect the input end of bridge rectifier circuit [11], the output terminal and the resistance R of bridge rectifier circuit [11] ₁, two capacitor C ₂, C ₃And after connecting, be connected between the trigger board G and negative electrode A of controllable silicon SCR, it is characterized in that also setting up one section time-delay reset circuit [4] between power circuit [5] and the executive circuit [3], and the execution relay J in the executive circuit [3] ₂One group of normally closed contact J with auxiliary reclay _1-1Series connection is between electrode line [9] and negative line [6].

2, device according to claim 1 is characterized in that time-delay reset circuit [4] is by unijunction transistor BT, resistance R ₂, R ₃, R ₄, capacitor C ₄, C ₅Form; Resistance R ₂Be connected on the second base stage b of unipolar transistor BT ₂And between the electrode line [9].Resistance R ₄Be connected between the trigger electrode e and electrode line [9] of unipolar transistor BT capacitor C ₅One group of normally closed contact J with auxiliary reclay _1-2Be connected between the anode k of the trigger electrode e of unipolar transistor and controllable silicon SCK resistance R after the parallel connection ₃Be connected on the first substrate b of unipolar transistor ₁And between the anode K of controllable silicon SCK, capacitor C ₄Be connected on the first base stage b of unipolar transistor ₁And between the negative line [6].

3. device according to claim 1 and 2 is characterized in that carrying out relay J ₂Two groups of normally opened contacts (moving close) J _2-1, J _2-2Be connected in the power lead L that leads to the user ₁, L ₂In.