CN2066140U - Automatic control alarm watt-hour meter for limiting quantity of electricity and anti-stealing electricity - Google Patents

Automatic control alarm watt-hour meter for limiting quantity of electricity and anti-stealing electricity Download PDF

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Publication number
CN2066140U
CN2066140U CN 89213504 CN89213504U CN2066140U CN 2066140 U CN2066140 U CN 2066140U CN 89213504 CN89213504 CN 89213504 CN 89213504 U CN89213504 U CN 89213504U CN 2066140 U CN2066140 U CN 2066140U
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China
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electricity
supervisory signal
secondary coil
phase
electric energy
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CN 89213504
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Chinese (zh)
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鲁润泽
张凤琴
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Individual
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Priority to CN 89213504 priority Critical patent/CN2066140U/en
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Abstract

The utility model relates to an automatic control alarm watt-hour meter for limiting the quantity of electricity and anti-stealing electricity, comprising an electromagnetic torque mechanism and a mechanical driving counting mechanism. On the basic of the original structure, the two terminals of the primary coil of an electromagnetic coupler are connected with the two terminals of a current coil, the two terminals of the secondary coil winded with two windings generate the monitor signal of limiting the quantity of electricity in load and the monitor signal of anti-stealing electricity in no-load in the watt-hour meter, and the monitor signals are amplified, detected, filtered and then input into a comparator. A switch circuit controls the automatic disconnecting and closing of the power source and emits an acoustooptic alarm. The utility model makes the measurement, control, anti-stealing and acoustooptic alarm of the watt-hour meter into an integration.

Description

Automatic control alarm watt-hour meter for limiting quantity of electricity and anti-stealing electricity
The utility model is a kind of when can limiting, controlling the user power utilization amount, also can prevent the electric energy meter that has sound and light alarm of user's stealing.
Accompanying drawing 1 is the structural representation of existing watt-hour meter, mainly contain electromagnetic torque system and mechanical drive number system, it is by voltage iron core 1, potential winding 2, current ferric core 3, current coil 4, rotating disk 5, rotating shaft 6, braking member 7, lower bearing 8, head bearing 9, worm gear 10, worm screw 11 reaches back magnetic pole 12 and forms, after connecting load, rotating disk 5 between voltage iron core 1 and current ferric core 3 rotates and promote worm screw 11 and worm gear 10 has to reach the metering order, but this watt-hour meter does not limit and the control of cutting off the power supply the maximum operation electric weight that the user uses, and as long as the user with two terminal shortcircuits of the current coil of watt-hour meter, the just almost stall of the rotating disk of watt-hour meter, so promptly reach the purpose of stealing, moreover, the user opens the wiring end cap privately, the potential winding of unsnaping hook, rotating disk promptly stops operating because of losing magnetic field, watt-hour meter has also stopped the electricity consumption metering, and stealing is achieved equally.
When the purpose of this utility model was to provide a kind of watt-hour meter unloaded, the maximum operation of limited user that the magnetic induction of current coil is converted to the electromotive force supervisory signal by an electromagnetic coupler made the electric energy meter that power consumption can be anti-electricity-theft.
Fig. 2 is the design's a structure diagram.
Fig. 3 is the design's a block diagram.
The utility model can limit control to the maximum operate power of user, also can prevent stealing.When the maximum operate power of user exceeds set-point, watt-hour meter is promptly stopped power supply and is interrupted metering, simultaneously can send sound and light alarm, user in the warning phase is if reduce operate power in set-point, and watt-hour meter send electricity voluntarily, when user's stealing (short-circuit current coil or remove the potential winding hook), watt-hour meter is stopped power supply immediately, simultaneously can send sound and light alarm, stop stealing up to the user, watt-hour meter can be powered.It is to have increased electromagnetic coupler, electric weight qualification controller and controller for preventing illegal use of electricity, on-off circuit and audible-visual annunciator on the basis of existing watt-hour meter structure.
The utility model is achieved in that on the basis that does not change former watt-hour meter structure, the two ends of the primary winding of an electromagnetic coupler that is used for the watt-hour meter sampled signal are linked to each other with the two ends of meter current coil respectively, and the two ends of the secondary coil of electromagnetic coupler limit supervisory signal and anti-electricity-theft supervisory signal as electric weight respectively.
Electric weight limits supervisory signal and introduces the amplifier that electric weight limits in the controller and amplify, and enters comparer through detection, filtering again, then the work by on-off circuit control circuit breaker.The normally closed contact of relay seals in going out in the line loop of watt-hour meter, normally opened contact seals in sound light alarming circuit, during user power utilization, electric current is by the primary winding of electromagnetic coupler, end at secondary coil forms the induced potential that is proportional to the electricity consumption electric current, this electromotive force is used as electric weight and limits supervisory signal, this signal is through amplifying, detection, enter comparer after the filtering, along with the increase of user power utilization amount, when filter value reaches the setting difference of comparer, comparer output noble potential, make relay charged by on-off circuit, normally closed contact disconnects, and the corresponding cut-out in watt-hour meter loop reaches the purpose that overload is cut off the power supply, meanwhile, the normally opened contact closure is connected sound light alarming circuit, has realized sound and light alarm.
When watt-hour meter is unloaded, potential winding is charged, no current flows through in the current coil, but because the primary winding of electromagnetic coupler links to each other with current coil, the magnetic force line cutting current coil that the iron core of potential winding produces, end at the secondary coil of electromagnetic coupler forms an induced potential, and the design utilizes the anti-electricity-theft supervisory signal of this electromotive force as when unloaded (stealing) under the extreme case exactly.Under the normal condition, the amplifier of this signal in controller for preventing illegal use of electricity amplifies, and is input to sensitivity again after filtering, select comparer, make this comparer be output as zero, during user's stealing, described anti-electricity-theft supervisory signal disappears, and makes amplifier be output as zero, causes sensitivity to select comparer output noble potential, make circuit breaker charged through on-off circuit, normally closed contact is opened, and cuts off user's power supply, at the same time, the normally opened contact closure is sent sound and light alarm, reaches anti-electricity-theft purpose.
Fig. 4 is the design's a complete machine embodiment circuit diagram.
Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9 are respectively the exploded view of Fig. 4.
Figure 10,11 is the design's shell body figure
Below in conjunction with embodiment the design is described in detail.
As shown in Figure 5: W 1Be the potential winding of watt-hour meter, W 2Be current coil, the magnetic flux φ that produces behind two coil electricities m, φ 2Pass the aluminium dish and make its rotation counting, DB is an electromagnetic coupler, and the two ends of its primary winding link to each other with two ends a, a ' of current coil respectively, primary coil adopt the 0.07mm enameled wire on E1 sections core around 300 circles, secondary coil adopts 0.07mm enameled wire, N equally 1Be 900 circles, N 2Be 1350 circles, its reactance X Dm＞＞current coil reactance X 1, both ratio values are tending towards infinite.The shunting action of electromagnetic coupler goes to zero, in addition in the watt-hour meter to the fine adjustment function of torque, strict guarantee of the present invention precision, one end A of the secondary coil of electromagnetic coupler inserts the amplifier input terminal in the electric weight qualification controller, amplifier input terminal in the other end A ' access controller for preventing illegal use of electricity of secondary coil.
When watt-hour meter is unloaded, the potential winding iron core is magnetized, the magnetic line of force passes the aluminium dish and form induction on the current ferric core coil, because the design is closed circuit with current coil with the primary winding of electromagnetic coupler, primary winding and current coil produce induced potential, after the secondary coil of electromagnetic coupler boosts as the anti-electricity-theft supervisory signal under the extreme case (because off-balancesheet the molten device of cutting is arranged, so user's stealing when zero load is the safest).The design gets N 2＞N 1So, electromotive force E A', E AE A' do anti-electricity-theft supervisory signal, and E ALimit supervisory signal as power consumption.
At watt-hour meter arranged when carrying, the effect of potential winding iron core and current coil iron core forms turning moment, and the aluminium dish rotates, and the two ends of current coil produce the interchange millivolt electromotive force that is proportional to user's electric current simultaneously, and this electromotive force is delivered to secondary coil through boosting of electromagnetic coupler.
Electromagnetic coupler also plays when coupling is boosted and makes control circuit and civil power loop buffer action among the design, guarantees the safety of circuit.
As shown in Figure 6: by IC 1, IC 2Constitute power consumption with peripheral cell and limited controller, IC 1, serve as signal and amplify IC 2Serve as signal relatively.R wherein 1, R 2With IC 1Constitute anti-phase scale operation amplifier, the E when suitably the selection percentage value makes it for zero load AValue is carried out the restriction of output amplitude, and an end A who limits the secondary coil of supervisory signal as electric weight inserts anti-phase scale operation amplifier input terminal.IC 1Output terminal be connected to detector diode, its threshold voltage is 0.2V～0.4V, thereby to E AThe output amplitude restriction of value is easy to realize that the electric weight that is exaggerated limits supervisory signal through diode D 1Detection and C 1, R 3Filtering enter the given comparer of electric weight, it is by R 4, selector switch K, given divider resistance R 5, R 6With IC 2Constitute, filtered signal enters with phase comparator IC 2, C 3, R 3Constitute the reclosing delay circuit, with phase comparator IC 2Output terminal B insert logic switching circuit.
When watt-hour meter is unloaded, by the E of electromagnetic coupler coupling AElectromotive force numerical value very little (6mv), the design gets R 1Be 56K Ω, R 2Be 1M Ω,
U 01=| (R 2)/(R 2) E A| (not considering phase place)
Its value only has 107mV, is not enough to overcome diode D 1Dead band voltage 0.2V, and exactly be diode D 1Initial pre-bias voltage, amplifier does not have the detection output valve at this moment, thereby the comparer in-phase end is input as zero, comparator output terminal also is zero, logic switch is failure to actuate.
Watt-hour meter have carry after, enter IC through the power consumption supervisory signal of electromagnetic coupler coupling 1Carry out ratio and amplify, through diode D 1Detection, C 1Enter the comparer in-phase end after being filtered into direct current signal, when the power consumption supervisory signal equals set-point, IC 2The output noble potential, the logic switch action, set-point is by R 4, R 5Or R 6And K switch is selected, and the design is given two grades of power consumptions are respectively 300W and 600W, and management of power supply and power utilization department is selected.
C 1, C 2, C 3And R 3Constitute time delay network, wherein C 1The main filter circuit that forms is delayed time, and duration is very little, C 2Mainly serve as the overbump bypass that user's inductive load is started; Release delay is also very little, so the main time value of time delay network is by C 3And R 3Finish, the purpose of time-delay is that after the overload of user power utilization amount, logic switch disconnects normally closed contact and cuts off the electricity supply, if the user reduces power consumption instantly, can restore electricity, reduce the power consumption alerting signal otherwise should send to urge to the user every a delay time, promptly test mass closes a floodgate once.The time-delay process is: after the power consumption overload, and the logic switch action, normally closed contact disconnects, and power consumption signal disappears, IC 1Amplifier out V 01Be zero, but C 1, C 2, C 3The last lotus of charging need could disappear through behind the corresponding delay time, disappears for still keeping with phase comparator IC 2Input end and the current potential of output terminal, promptly keeping the disconnection of logic switch, electric charge on capacitor disappears.This moment the normally closed contact closure, sending for the first time, prompt off-load signal also is that test mass closes a floodgate for the first time.Be worth the design during this period of time and select 10 seconds, reduce power consumption as user in 10 seconds, then test mass closes a floodgate successfully, for the user restores electricity, otherwise cuts off the electricity supply continuing.
As shown in Figure 7: by IC 3, IC 4And peripheral cell has been formed controller for preventing illegal use of electricity, IC 3Serve as the amplification of anti-electricity-theft supervisory signal, IC 4Serve as sensitivity and set R 8With IC 3Constituted the proportional amplifier of high-gain, after this amplifier amplifies anti-electricity-theft supervisory signal, through diode D 2Detection, C 4Filtering forms a direct current signal that is proportional to supervisory signal and enters anti-phase comparer IC at last 4Inverting input.Because IC 3Constituted high-gain amplifier, thereby to anti-electricity-theft supervision electromotive force E A' signal has enough enlargement factors to make amplifier IC 3Output voltage U 03Greater than diode D 2Dead band voltage 0.2～0.4V, after detection, filtering, enter IC 4End of oppisite phase, cause anti-phase comparer IC 4Output voltage U 04Be zero, suitably regulate R WCan select to control IC 4Sensitivity.
(short-circuit current coil or remove potential winding hook) supervisory signal E then when user's stealing A' disappear high-gain proportional amplifier IC 3Be output as zero.Make anti-phase comparer IC 4Inverting input be electronegative potential, output terminal is a noble potential, adjusts R WIn fact be exactly to adjust IC 4The threshold values comparative voltage of in-phase end plays the sensitivity effect of selecting, and can also play simultaneously when the change variation of the supervisory signal sensitivity played of watt-hour meter aluminium dish and magnetic flux gap.This mainly is after the gap changes, E A' will change, change R this moment WCan reselect.
As shown in Figure 8: by diode D 3, D 4Integrated switching circuit TWH8778, miniature high capacity circuit breaker J, diode D 5, capacitor C 2Constitute logic switch.D 3, D 4Form OR-circuit, D 3Positive pole connects electric weight and limits controller with phase comparator IC 2Output terminal B, D 4Positive pole meet anti-phase comparer IC in the electric controller 4Output terminal B, B 3, B 4Negative pole be connected on the control end 5 of TWH8778 jointly, the power end 1 of TWH8778 integrated switching circuit connects dc power anode, output terminal 2,3 connects an end of circuit breaker coil, the other end ground connection of coil.Diode D 5For instead swashing electromotive force, coil is released into diode, in order to protection integrated switching circuit, D 5Plus earth, negative pole connects the output terminal of integrated switching circuit.
When electric weight limits the output terminal of controller (with the IC of phase comparator 2Output terminal) or output terminal (the anti-phase comparer IC of controller for preventing illegal use of electricity 4Output terminal) when noble potential occurring, logic switch is connected at once, makes that relay coil is charged to be serially connected in the normally closed contact that watt-hour meter goes out in the line loop and to disconnect, and cuts off user's power supply, and is connected on the normal opened contact closure in the sound and light alarm loop, sends sound and light alarm.C 2Be protecting against shock electric weight electric capacity such as the startup of high capacity inductive load, the immediate current of appearance is through C 2Integral action make relay can not form misoperation, relay is the small-sized high capacity relay of JQX.
As shown in Figure 9: by decompression capacitor C 5, starter neon lamp G and divider resistance R 18And piezoelectric patches Y forms sound light alarming circuit, C 5One termination normal opened contact, the other end connecting resistance R of another termination G neon lamp G 18, R 10Another termination civil power zero line, piezoelectric patches is attempted by R 10Two ends.
After the normal opened contact closure, the civil power of 50HZ is through C 1And step-down and the R of G 18Dividing potential drop, make piezoelectric patches Y obtain alternating voltage, produce piezoelectric effect, beep occurs, and neon lamp G also sends ruddiness in step-down.
As shown in Figure 4: by power transformer T, rectifier bridge QZ and filter capacitor C 6Form the complete machine power supply.Under the normal condition, the normally closed contact closure, electric weight limits controller and is in monitored state.The complete machine electric current is less than 2mA.After relay was charged, the complete machine electric current was less than 6mA.Transformer is selected 1W, and QZ selects 12V, 1A.
The design selects electromagnetic coupler as signal sampling, be attempted by in the control loop, make and break contact is serially connected in the transmission line circuit of kilowatt-hour meter, so that metering, control, anti-electricity-theft, four kinds of functions of sound and light alarm are dissolved in one, overcome its phenomenon that breaks away from mutually in the prior art, the current transformer of also having broken away from simultaneously outmoded employing heaviness is made the method for user's current sample, especially improved the degree of accuracy according to current sample, realized in gauge table, finishing simultaneously the control electricity consumption, anti-electricity-theft, the function of reporting to the police, main is has avoided for many years that the user utilizes the defective on the kilowatt-hour meter external terminal to carry out stealing.

Claims (10)

1, a kind of electric energy meter, comprise the potential winding that is wound on the iron core and current coil and the transmission counting mechanism that is used to measure, it is characterized in that increasing one can be used for obtaining the two ends of primary winding that power consumption limits the electromagnetic coupler of supervisory signal or anti-electricity-theft supervisory signal and links to each other with the two ends of current coil respectively, the termination that can produce gauging table on the secondary coil of electromagnetic coupler has the power consumption that carries current coil to convert to by electromagnetic coupler to limit the secondary coil of supervisory signal is gone into the scale operation amplifier input terminal, supervisory signal after the amplification is through detection, enter a comparer after the filtering, the output terminal of comparer is connected to the on-off circuit that control gauging table current return disconnects.
2, electric energy meter as claimed in claim 1, it is characterized in that, the scale operation amplifier that secondary coil one end of generation power consumption supervisory signal is connect on secondary coil, the power consumption after the amplification limits supervisory signal and enter an in-phase input end with phase comparator behind diode detection, capacitor filtering.
3, electric energy meter as claimed in claim 1, it is characterized in that on secondary coil producing the scale operation amplifier that an end of the secondary coil of anti-electricity-theft supervisory signal is connect, the anti-electricity-theft supervisory signal after the amplification enters the inverting input of an anti-phase comparer behind diode detection, capacitor filtering.
4, electric energy meter as claimed in claim 1, it is characterized in that on a winding of secondary coil, producing scale operation amplifier of a termination that power consumption limits the secondary coil of supervisory signal, produce another scale operation amplifier of another termination of the secondary coil of anti-electricity-theft supervisory signal on another winding of secondary coil, the power consumption supervisory signal after the amplification enters an in-phase input end with phase comparator behind diode detection, capacitor filtering.Anti-electricity-theft supervisory signal after the amplification enters the inverting input of an anti-phase comparer behind another diode detection, capacitor filtering.
5,, it is characterized in that the normally closed contact of the relay of on-off circuit control is serially connected in the outlet current return of gauging table as claim 2,3 or 4 described electric energy meters.
6, electric energy meter as claimed in claim 5, it is characterized in that describedly linking to each other with the positive pole of a diode respectively with the output terminal of phase comparator and the output terminal of described anti-phase comparer, the negative pole of described two diodes inserts the control end of an integrated switching circuit.
7,, it is characterized in that end of oppisite phase with phase comparator is connected at least can select the highest two component piezoresistances that make power consumption as claim 2 or 4 described electric energy meters.
8, electric energy meter as claimed in claim 6 is characterized in that the normally opened contact of the relay of integrated switching circuit control is serially connected in the alarm circuit.
9, electric energy meter as claimed in claim 8 is characterized in that warning circuit by decompression capacitor, and starter neon lamp and piezoelectric patches are formed.
10,, it is characterized in that the in-phase end of described anti-phase comparer is connected to a regulating resistor of regulating anti-phase comparator sensitivity as claim 3 or 4 described electric energy meters.
CN 89213504 1989-06-29 1989-06-29 Automatic control alarm watt-hour meter for limiting quantity of electricity and anti-stealing electricity Withdrawn CN2066140U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 89213504 CN2066140U (en) 1989-06-29 1989-06-29 Automatic control alarm watt-hour meter for limiting quantity of electricity and anti-stealing electricity

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 89213504 CN2066140U (en) 1989-06-29 1989-06-29 Automatic control alarm watt-hour meter for limiting quantity of electricity and anti-stealing electricity

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CN2066140U true CN2066140U (en) 1990-11-21

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CN 89213504 Withdrawn CN2066140U (en) 1989-06-29 1989-06-29 Automatic control alarm watt-hour meter for limiting quantity of electricity and anti-stealing electricity

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101496295B (en) * 2006-08-02 2012-11-07 日本电气株式会社 Transmitter
CN104319559A (en) * 2014-09-29 2015-01-28 余姚市嘉荣电子电器有限公司 Leakage protection plug with ground wire live-line indication

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101496295B (en) * 2006-08-02 2012-11-07 日本电气株式会社 Transmitter
CN104319559A (en) * 2014-09-29 2015-01-28 余姚市嘉荣电子电器有限公司 Leakage protection plug with ground wire live-line indication

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