CN201464632U - On-line detector for single phase electronic energy meter - Google Patents

Abstract

An on-line detector for a single phase electronic energy meter is provided with a transformer as a built-in load in a form of an autotransformer to produce heavy current to form a loop with a tested electricity meter; simultaneously, the heavy current is connected to a reference module unit; the autotransformer outputs a sampling voltage via a first electric resistance R1 and transmits the sampling voltage to the reference module unit; the tested electricity meter and the reference module unit work under the same load current and respectively transmit a pulse signal of the tested electricity meter and a pulse signal of the reference module unit to a single chip for calculation; and calculated values of the above two pulse signals are simultaneously transmitted to a liquid crystal display to be displayed separately. Within a certain time, difference of the calculated values of the above two pulse signals is regarded as the accuracy of the tested electricity meter. The on-line detector for a single phase electronic energy meter has the advantages of being high in accuracy, small in volume and simple to use; can be simply operated by buttons; and can plug and play and be safe and easy to use.

Description

Single-phase electronic electric energy meter on-line detector

Technical field

The utility model relates to a kind of pick-up unit, the on-line detector of the single-phase electronic electric energy meter accuracy of particularly a kind of online detection.

Background technology

The electric energy metrical that is used for each Utilities Electric Co., electric company and electricity consumption marketing department is at present checked on-line detector, and price is expensive, volume is big, wiring is inconvenient, not light and handy and inconvenient when using.

The utility model content

Technical matters of the present utility model is that the single-phase electronic electric energy meter on-line detector that a kind of volume is little, precision is high will be provided.

In order to solve above technical matters, the utility model provides a kind of single-phase electronic electric energy meter on-line detector, if a transformer is as built-in load, adopt the autotransformer form to produce big electric current and tested ammeter formation loop, this big electric current is connected to the base modules unit simultaneously, autotransformer is delivered to the base modules unit by first resistance R, 1 output sampling voltage, tested ammeter and base modules cell operation are in same load current, with the pulse signal of tested ammeter and the pulse signal of base modules unit, delivering to single-chip microcomputer respectively calculates, both calculated values are delivered to LCDs simultaneously and are shown respectively, what both pulses were calculated within a certain period of time is poor, i.e. the precision of tested ammeter.

Described Single-chip Controlling one relay, whether the primary voltage of relay control transformer is connected, the pulse count signal of sending when the base modules unit to 100 the time, the Single-chip Controlling actuating of relay, cut off the power supply of tested ammeter, tested ammeter stops output pulse signal.

Detector is a box structure, one end is the terminal that detects electric energy meter, the other end is the terminal of detection reference modular unit, the front is a LCDs, show tested electric energy meter metrical pulse number and base modules unit pulse measurement number respectively, the terminal that detects electric energy meter is corresponding with tested energy meter terminal.

Superior effect of the present utility model is:

1) the precision height, volume is little, use is light and handy;

2) push-botton operation, short and sweet, easy and simple to handle;

3) built-in load need not directly insert and can on-line synchronous measure by mutual inductor;

4) built-in ac power supply need not battery, with inserting with usefulness;

5) have outside censorship terminal, pulse output, convenient censorship;

6) shell is the ABS engineering plastics, and reliable insulation is safe in utilization;

7) be widely used, can be used for power utility check and electric power audit department.

Description of drawings

Fig. 1 is a schematic block circuit diagram of the present utility model;

Fig. 2 is a basic circuit diagram of the present utility model;

Fig. 3 is the basic circuit diagram of base modules unit;

Fig. 4 is a stereographic map of the present utility model;

Fig. 5 is a panel front elevation of the present utility model;

The number in the figure explanation

The 1-single-chip microcomputer; The built-in load of 2-;

3-base modules unit; The 4-LCDs;

5-measures button; The 6-reset button;

The 7-measured value; The 8-reference value;

9-detects the terminal of electric energy meter; The terminal of 10-detection reference modular unit.

Embodiment

See also shown in the accompanying drawing, the utility model will be further described.

As Fig. 1, Fig. 2 and shown in Figure 3, the utility model provides a kind of single-phase electronic electric energy meter on-line detector, if a transformer T1 is as built-in load 2, adopt the autotransformer form to produce big electric current and the tested ammeter L of 10A, L1 constitutes the loop, this big electric current is connected to base modules unit 3 simultaneously, autotransformer T1 delivers to base modules unit 3 by first resistance R, 1 output sampling voltage, tested ammeter L, L1 and base modules unit 3 work in same load current, with the pulse signal of tested ammeter and the pulse signal of base modules unit 3, delivering to single-chip microcomputer 1 respectively calculates, both calculated values are delivered to LCDs 4 simultaneously, LCDs 4 shows measured value 7 and reference value 8 respectively, what both pulses were calculated within a certain period of time is poor, i.e. the precision of tested ammeter.

As shown in Figure 2, when tested ammeter (1)-(2) inlet wire, the J1 adhesive, contact D, E connect, and phase line forms current return through (1), A, B, R1, T1-1, E, D, (4); When tested ammeter (1)-(3) inlet wire, J1 does not inhale, and contact C, E connect, and phase line forms current return through (1), A, B, R1, T1-1, E, C, (2).Described single-chip microcomputer 1 control one relay J 1, whether the primary voltage of relay J 1 control transformer T1 is connected, the pulse count signal of sending when base modules unit 3 to 100 the time, single-chip microcomputer 1 pilot relay J1 action, cut off the power supply of tested ammeter, tested ammeter stops output pulse signal.Wherein: L2 is that phase line is advanced, and L3 is that phase line goes out, and N2 is that zero line advances, and N3 is that zero line goes out.

As Fig. 4, shown in Figure 5, on-line detector of the present utility model is a box structure, one end is the terminal 9 that detects electric energy meter, the other end is the terminal 10 of detection reference modular unit, the front is LCDs 4, measurement button 5 and reset button 6, show tested electric energy meter metrical pulse number and base modules unit 3 pulse measurement numbers respectively, the terminal that detects electric energy meter is corresponding with tested energy meter terminal.

The utility model internal load adopts low-voltage, high-current, it is the big electric current of the transformer T1 winding generation 10A in the circuit, form the loop with tested ammeter L, L1, the pulse signal of tested electric energy meter is counted through measurement terminal input single-chip microcomputer, and the pulse signal of base modules unit 3 metering circuits is input to single-chip microcomputer 1 control circuit.When the pulse signal of base modules unit 3 counted to 100, single-chip microcomputer 1 pilot relay J1 action was measured button 5 dead electricity and is stopped to measure, at this moment the shown numerical value of LCDs is the number of pulses of tested table, as show 95, or 105, then tested Watch Error is 5 percent.

As shown in Figure 2, the 220V voltage that measurement terminal is introduced,, uses for each module of on-line detector through rectifying and wave-filtering voltage stabilizing output 12V voltage to 15V through transformer T1 transformation.

Claims (3)

1. single-phase electronic electric energy meter on-line detector is characterized in that:

If a transformer is as built-in load, adopt the autotransformer form to produce big electric current and tested ammeter formation loop, this big electric current is connected to the base modules unit simultaneously, autotransformer is delivered to the base modules unit by first resistance (R1) output sampling voltage, tested ammeter and base modules cell operation are in same load current, with the pulse signal of tested ammeter and the pulse signal of base modules unit, delivering to single-chip microcomputer respectively calculates, both calculated values are delivered to LCDs simultaneously and are shown respectively, what both pulses were calculated within a certain period of time is poor, i.e. the precision of tested ammeter.

2. by the described single-phase electronic electric energy meter on-line detector of claim 1, it is characterized in that:

Described Single-chip Controlling one relay, whether the primary voltage of relay control transformer is connected, the pulse count signal of sending when the base modules unit to 100 the time, the Single-chip Controlling actuating of relay, cut off the power supply of tested ammeter, tested ammeter stops output pulse signal.

3. by the described single-phase electronic electric energy meter on-line detector of claim 1, it is characterized in that:

Detector is a box structure, one end is the terminal that detects electric energy meter, the other end is the terminal of detection reference modular unit, the front is a LCDs, show tested electric energy meter metrical pulse number and base modules unit pulse measurement number respectively, the terminal that detects electric energy meter is corresponding with tested energy meter terminal.

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