CN202362340U

CN202362340U - Electric energy meter control circuit

Info

Publication number: CN202362340U
Application number: CN2011204463451U
Authority: CN
Inventors: 徐海江; 高松平; 刘永峰; 邵柳东
Original assignee: Ningbo Sanxing Electric Co Ltd
Current assignee: Ningbo Sanxing Medical and Electric Co Ltd
Priority date: 2011-11-14
Filing date: 2011-11-14
Publication date: 2012-08-01
Anticipated expiration: 2021-11-14

Abstract

The utility model discloses an electric energy meter control circuit, comprising electromagnet coils and a load circuit in an electric energy meter, a dual output stabilized power supply, a simulation switch, a strong current detection circuit, a current transformer TA, a weak current detection circuit, an OR gate G, a trigger AC switch, a compensation moment control apparatus and a compensation moment coil LB, and employing a load current detection apparatus with high sensitivity and low power consumption to control the power supply of voltage electromagnet, the compensating moment being capable of automatically adjusting according to operating processes. The electric energy meter control circuit of the utility model can eliminate shunt running of an induction type electric energy meter, raise sensitivity and save energy.

Description

The electric energy meter control circuit

Technical field

The utility model relates to a kind of electric energy meter control circuit.

Background technology

Induction type electric energy meter is a kind of relatively simple for structure, low-cost electrical instrument, and its good stability, long service life still is being widely used at present.Induction type electric energy meter its voltage magnet coil under idling still is in "on" position, thereby has caused unnecessary energy loss, and its light load compensation moment is to produce through the magnetic flux that divides the voltage electromagnet; This makes that the shunt running phenomenon can take place electric energy meter under idling; The shunt running phenomenon of electric energy meter is meant that at the current return no current voltage is in the 80%-110% of rated voltage scope, and the electric energy meter disk rotates the phenomenon that surpasses a circle continuously; Also be usually said " idle running "; So increased the shunt running device that disappears,, also restricted the sensitivity of induction type electric energy meter though the shunt running device that disappears can be limited in the shunt running of aluminium dish within one circle.

The utility model content

The utility model technical matters to be solved is that the electric energy meter control circuit of eliminating induction type electric energy meter shunt running, raising sensitivity and having energy-saving effect is provided.

For solving the problems of the technologies described above; The electric energy meter circuit that the utility model provides; Comprise magnet coil and load circuit thereof in the electric energy meter, also comprise dual output stabilized voltage supply, analog switch, heavy current testing circuit, current transformer TA, weak current testing circuit or door G, trigger alternating-current switch, compensating torque control device, compensating torque coil LB; Wherein the input end of dual output stabilized voltage supply connects the live wire L of load circuit; An output terminal of dual output stabilized voltage supply connects the heavy current testing circuit through analog switch; Another output terminal of dual output stabilized voltage supply connects the weak current testing circuit; The input end of heavy current testing circuit and weak current testing circuit is the Secondary Winding of series current mutual inductor TA respectively; The windings in series of current transformer TA is in the load circuit of voltage electromagnet, the output terminal of heavy current testing circuit and weak current testing circuit through or a door G is connected and triggers alternating-current switch, triggering alternating-current switch output terminal connects magnet coil and compensating torque control device respectively; The compensating torque control device connects compensating torque coil LB, and compensating torque coil LB links to each other with the live wire L of load circuit; Dual output stabilized voltage supply, triggering alternating-current switch, compensating torque control device be ground connection respectively, and the weak current testing circuit connects zero line; The dual output stabilized voltage supply is used for supplying power to the weak current testing circuit; Analog switch is used for the Energy Saving Control to the dual output stabilized voltage supply; Trigger alternating-current switch and be used for the control to the voltage electromagnet and the compensating torque coil of electric energy meter, the compensating torque control device is used for the control to the compensating torque coil current.

After adopting above structure, the utility model compared with prior art has following advantage:

Adopted the power supply of the load current pick-up unit control voltage electromagnet of high sensitivity, low-power consumption; Can remove the shunt running device that disappears; Thereby both reached the purpose of Energy Saving Control; Can improve the sensitivity and the degree of accuracy of induction type electric energy meter again, its compensating torque can be regulated according to its course of work automatically, when starting, produces bigger slightly compensating torque to overcome the influence of stiction; Start the post-compensation torque and be reduced to normal value automatically, so just help improving the sensitivity of induction type electric energy meter.

Description of drawings

Fig. 1 is the utility model electric energy meter control circuit structural representation.

Embodiment

Below in conjunction with accompanying drawing and embodiment the utility model is done explanation in further detail.

Can know by the utility model electric energy meter control circuit structural representation shown in Figure 1; Comprise magnet coil and load circuit thereof in the electric energy meter, also comprise dual output stabilized voltage supply, analog switch, heavy current testing circuit, current transformer TA, weak current testing circuit or door G, trigger alternating-current switch, compensating torque control device, compensating torque coil LB; Wherein the input end of dual output stabilized voltage supply connects the live wire L of load circuit; An output terminal of dual output stabilized voltage supply connects the heavy current testing circuit through analog switch; Another output terminal of dual output stabilized voltage supply connects the weak current testing circuit; The input end of heavy current testing circuit and weak current testing circuit is the Secondary Winding of series current mutual inductor TA respectively; The windings in series of current transformer TA is in the load circuit of voltage electromagnet, the output terminal of heavy current testing circuit and weak current testing circuit through or a door G is connected and triggers alternating-current switch, triggering alternating-current switch output terminal connects magnet coil and compensating torque control device respectively; The compensating torque control device connects compensating torque coil LB, and compensating torque coil LB links to each other with the live wire L of load circuit; Dual output stabilized voltage supply, triggering alternating-current switch, compensating torque control device be ground connection respectively, and the weak current testing circuit connects zero line; The dual output stabilized voltage supply is used for supplying power to the weak current testing circuit; Analog switch is used for the Energy Saving Control to the dual output stabilized voltage supply; Trigger alternating-current switch and be used for the control to the voltage electromagnet and the compensating torque coil of electric energy meter, the compensating torque control device is used for the control to the compensating torque coil current.

When electric energy meter was in idling, the weak current testing circuit was in stand-by state, dual output stabilized voltage supply output+2.5V ,-2.5V voltage is to the power supply of weak current testing circuit, and circuit power consumption is about 8mW.

Under the situation of weak current load, electric current is provided for the weak current test section by the dual output stabilized voltage supply, trigger the power supply that alternating-current switch is controlled voltage electromagnet and compensating torque coil by the control of weak current testing circuit.

Under general loading condition, heavy current testing circuit output signal controlling analog switch makes the dual output stabilized voltage supply quit work; The signal of heavy current testing circuit output is simultaneously also controlled the triggering alternating-current switch, in order to the power supply of control voltage electromagnet and compensating torque coil.

After adopting this technology; Electric energy meter load current aluminium dish when 1.2mA can begin to rotate; Can widen the loading range of electric energy meter like this; And the degree of accuracy of raising electric energy meter, solved the contradiction (sensitivity of the electric energy meter after the repacking is expected to improve 1mA) between traditional induction type electric energy meter sensitivity and the maximum load current.

Claims

1. electric energy meter control circuit; Comprise magnet coil and load circuit thereof in the electric energy meter, it is characterized in that: also comprise dual output stabilized voltage supply, analog switch, heavy current testing circuit, current transformer TA, weak current testing circuit or door G, trigger alternating-current switch, compensating torque control device, compensating torque coil LB; Wherein the input end of dual output stabilized voltage supply connects the live wire L of load circuit; An output terminal of dual output stabilized voltage supply connects the heavy current testing circuit through analog switch; Another output terminal of dual output stabilized voltage supply connects the weak current testing circuit; The input end of heavy current testing circuit and weak current testing circuit is the Secondary Winding of series current mutual inductor TA respectively; The windings in series of current transformer TA is in the load circuit of voltage electromagnet, the output terminal of heavy current testing circuit and weak current testing circuit through or a door G is connected and triggers alternating-current switch, triggering alternating-current switch output terminal connects magnet coil and compensating torque control device respectively; The compensating torque control device connects compensating torque coil LB; Compensating torque coil LB links to each other with the live wire L of load circuit, and dual output stabilized voltage supply, triggering alternating-current switch, compensating torque control device be ground connection respectively, and the weak current testing circuit connects zero line.