CN2160912Y - Pre-tariff meter for quantity of electricity - Google Patents

Abstract

The utility model relates to a prepayment meter of the electric quantity for an electric energy meter, which is used for the technical innovation to an existing electric energy meter in order to realize the prepayment and quantification of the electric supply. The conversion of the turning disk kilowatt/hour can be realized through the adoption of a digital setting device for counting the turning number of the turning disk, the counter of the unit's order is relatively independent of the counter of other digit places, counters except for the counter for unit's order are provided with corresponding dial switches and clear circuits, three parallel sensing input system and the counter for unit's order are connected with a counter for a ten's place via a time delay circuit with different parameters, and the precise conversion of the turning disk can be realized. The utility model has the advantages of stable work, strong adaptability and low cost. The utility model can provide an effective technique management for the institutional reform of the operation of the power supply department.

Description

Pre-tariff meter for quantity of electricity

What the utility model related to a kind of electric energy meter purchases device in advance with power consumption, promptly utilizes the electric energy meter controller for electric consumption that preestablishes the electricity consumption of method limited subscriber.

Electric energy meter use electric control, more and more be that society is required.Adopting magnetic card charging means is a kind of selections, but this scheme implementation cost costliness, and can not be suitable for that electricity price often changes or the supply area of rationing the power supply, and Rural Areas of China belongs to this situation substantially.Existing electric energy meter is being realized that also there is problem on the other hand in the power consumption control transformation, the dish that namely now is used for the every kilowatt hour of electric energy meter of electrical network turns to standard and differs, and a kind of technology reforming scheme of practicality must be able to adapt to that the difference dish of electric energy meter turns to standard and go in the electric work conversion process at dish and to guarantee measuring accuracy.Adopt a N system frequency divider among the CN91107306.X in the disclosed automatic gathering electric energy meter, be about to N input pulse and behind frequency divider, transfer pulsatile once output to.Obviously frequency divider can reduce electric quantity metering precision and stability, and electric power system is very high to electric measuring accuracy requirement.

The purpose of this utility model provide a kind of can be with the matching used electric weight of existing any electromagnetic induction electric energy meter forward purchasing device.

Task of the present utility model is achieved in that described pre-tariff meter for quantity of electricity is by electric energy meter, dish turns to sensor, dish turns to the setting counting circuit, electric work sets counter and circuit breaking controller forms, dish turns to sensor and places on the electric energy meter, turning to the setting counting circuit through dish is connected with circuit breaking controller with electric work setting counter, it is the electronic digit counting circuit that described dish turns to the setting counting circuit, the digit pulse output of counting circuit and corresponding dial switch connection beyond its position, each dial switch output is connected counter through an AND circuit and is connected with electric work, this output also is connected with the clear terminal of counting circuit beyond described the position through a delay circuit.

Each digit pulse output of each digit count circuit is connected with dial switch beyond above-mentioned the position, the output of each dial switch is connected through setting counter with door and electric work, this dial switch output also via delay circuit with described individual in addition the clear terminal of the counting circuit of numerical digit be connected.

For adapting to the needs of the three-phase three table electric power measurement system reforms, above-mentioned position counting circuit is three counting circuits that be arranged in parallel, the input of each counting circuit turns to sensor with the electric energy dial plate of a corresponding phase respectively and connects, its carry pulse output respectively connects a pulse delay circuit, each delay circuit via or Men Yushi digit counter input connect.

Aforementioned techniques scheme that the utility model adopts mainly provides a dish to turn to that a kilowatt hour is set and new departure of conversion: the multidigit counting circuit that is made of some counting circuits guarantees accuracy that dish is turned to counting, when turning to counting, dish keeps an independence of position counting circuit, compare and only utilize outside the position counting circuit that dish is turned to setting value, export pulse and the zero clearing corresponding with the kilowatt hour electric work, a position counting circuit is unaffected when zero clearing.For three-phase three table metering systems, a delay circuit that is located between position counting circuit and ten counting circuits has the different delayed time parameter, when two or three one's carry pulse synchronizations occur, ten counting circuits still can obtain normal pulse input, do not lose phenomenon, thereby avoided error in dipping.Only need when this device is installed sensor is placed a certain position that is stood facing each other with electric energy meter rotating disk outer rim, for example on the glass disc, press electric energy meter parameter assignment disk revolution on dial switch, for example 800, the cut-off switch circuit is connected get final product again.Set counter by the power supply department professional at electric work during use and set the numerical value of can powering, enter so-called forward purchasing power supply state, reach preset value in case consume electric work, cut-off switch opens circuit, and stops power supply.

The utility model stable work in work, strong adaptability, very simple to the electric energy meter transformation, improvement cost is lower, and does not affect measuring accuracy, is a kind of electric energy tariff reform technological means of suitable China's actual conditions.

Below in conjunction with accompanying drawing and embodiment, the utility model is specified.

Fig. 1 is the utility model circuit block diagram.

Fig. 2 is electric weight preset device circuit theory diagrams.

Fig. 3 is the utility model user mode synoptic diagram.

Being located at dish on the electric energy meter 11 among Fig. 1 turns to sensor 8 the transducing signal input disc is turned to setting apparatus 7, set counter 1 output electric work count pulse through conversion back electric work, when the counting that adds deduct reaches setting electric work value, to outage drive circuit 9 output triggering signals, cut-off switch 13 is disconnected.Turn to be provided with a dish in the setting apparatus 7 and to turn to a position counting circuit 6 and accept the sensing pulse at dish, and by Delay distribution device 5 and or door 4, turn to initialization circuit 2 output carry pulses to dish.A time-delay clear circuit 3 when dish commentaries on classics counting reaches setting value, is responsible for making dish to change and is set each counting circuit zero clearing in the counter 2.Also be provided with a sensor fault alarm control circuit 10 between dish commentaries on classics sensor 8 and outage driving circuit 9, its effect is that cut-off switch is auto-cutout still when sensor breaks down (comprising artificial destruction).Current transformer 12 is the sensor of electric energy meter 11 among the figure.

Fig. 2 is circuit theory diagrams, and the dish rotaring signal that far infrared probe LD and G gather adds to a position counting circuit IC1 after a pulse shaper 21 amplifies shaping CP end carries out a position counting.Ten pulses of every input, the Q9 end of IC1 by high level to the low level upset once, export a carry pulse, this carry pulse adds to the CP end of ten counting circuit IC2 by AND circuit 22 after the delay circuit of R, C and Schmidt's element H composition is processed.The corresponding connection with dial switch B1 of each Q end of this integrated circuit (IC) 2 constitutes ten countings and sets.IC 3, IC4 and dial switch B2 are connected that B3 is corresponding to be connected, and consist of respectively hundred, kilobit counting and set.The output terminal of dial switch B1, B2 and B3 adds to electric work through AND circuit 23 and sets counting circuit 24 input ends.Present embodiment has selected one can preset message register DJ and carry out the default and counting of kilowatt hour, also can use electronic counter.AND circuit 23 is returned time-delay clear circuit 25 simultaneously and is sent a quenching pulse, adds to the Cr end of integrated circuit (IC) 2, IC3 and IC4, makes corresponding counter O reset.Between the Cr of the Cr of individual station integrated circuit IC1 end and other counter end diode D2 is set, with the clear terminal Cr isolation with individual station integrated circuit IC1, only when reset button K pressed, each dish turned to simultaneously zero clearing of counter.The normally opened contact K1 that can preset message register DJ is connected in series with outage control relay J, consists of outage and drives, and the switch of this relay J can be realized control to the cut-off switch in the supply line.At message register K switch 1 two ends also and connect an electronic switch 29, far infrared probe through or door 32 connect this electronic switch 29 inputs, when probe damages or artificial destruction causes when opening circuit, outage drives the relay J adhesive, and supply line is cut off.

Circuit 27,28 is two circuit parallel with individual digit counter with above-mentioned sensing input, shaping among the figure, be used for three-phase three table metering systems, two delay circuits 30,31 corresponding with delay circuit 26 have the different delayed time parameter, the counting error that causes to prevent one's carry pulse synchronization from occurring.Luminous tube LED1-LED4 indicates respectively each integrated counter counting situation, and LED5 indication electricity forward purchasing uses up, and LED6 is then as probe warning indication, and LED7 is probe work indication.

Circuit setting+6V and+two voltage stabilizing DC sources of 24V; and take battery E as stand-by power supply, series diode D4 and D5 between+6V power supply and battery E consist of the ectonexine power supply; with counting circuit and the circuit isolation that does not need power-failure protecting, diode 2AP gives battery E charging.

Dish turns to be set on the dial switch B1-B3 to be finished, when turning to counting, dish reaches when setting value, the output upset of AND circuit 23 is high level, make electric work set counting circuit 24 and obtain a count pulse, make simultaneously each counter O reset except individual digit counter, finish a dish and turn to kilowatt hour conversion.There is hardly an error in dipping from what this working mechanism was not difficult to find out this change-over circuit, thereby forward purchasing measuring accuracy and the measuring accuracy of former electric energy meter are equal to, need not to do new metering evaluation after the transformation.

Fig. 3 is a product agent structure sketch, current transformer 41, cut-off switch 42 are located on the power network line, pre-dish commentaries on classics setting and electric weight preset electronic circuit part 43 and are located in the dust proof box, see through transparent panel and can see luminotron 44, dial switch 45 and the message register 46 that shows its various duties.Far infrared probe 47 can be located on the face glass of electric energy meter 48, and the rotation of dish is measured.Via line 49 is connected between cut-off switch 42 and the prewired circuit.Whole device is directly arranged on the transformer after being sealed by thief-proof shell 50.This device is particularly suitable for the reform of current Chinese countryside power supply management system, realizes forward purchasing power supply or quantitatively power supply.

Claims (5)

1, a kind of pre-tariff meter for quantity of electricity, by electric energy meter, dish turns to sensor, dish turns to the setting counting circuit, electric work sets counter and circuit breaking controller forms, dish turns to sensor and places on the electric energy meter, turning to the setting counting circuit through dish is connected with circuit breaking controller with electric work setting counter, it is characterized in that described dish turns to the digit pulse output of counting circuit beyond individual that sets counting circuit and corresponding dial switch connection, each dial switch output is connected counter with door with electric work through one and is connected, and this output also is connected with the clear terminal of counting circuit beyond described the position through a delay circuit.

2, by the described electric weight forward purchasing of claim 1 device, it is characterized in that described dish changes the individual digit counter of setting counting circuit and is provided with three, changeing sensor with three dishes respectively is connected, their digital carry pulse output terminal Q9, be connected with ten digit counter input ends with an OR circuit 22 through delay circuit 26,30,31, an isolating diode D2 is serially connected with between the clear terminal of a digit counter and other digit counters.

3, by claim 1 or 2 described pre-tariff meter for quantity of electricities, it is characterized in that described dish turns to the setting counting circuit and also is provided with a stand-by power supply E, serial connection isolating diode D4 and D5 between stand-by power supply E and circuit voltage stabilizing power supply, consist of inside and outside two-layer electric power system, described each dish turns to counter and places the internal layer electric power system.

4, by the described pre-tariff meter for quantity of electricity of claim 1, it is characterized in that described circuit breaking controller also is connected with the non-ground-end that dish turns to sensor through an electronic switch 29, consists of the sensor fault alarm control circuit.

5, by the described pre-tariff meter for quantity of electricity of claim 2, it is characterized in that described circuit breaking controller also through an electronic switch 29 with is connected an AND circuit 32 and is connected formation sensor fault alarm control circuit with the non-ground-end that three dishes turn to sensor.

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