CN2258619Y

CN2258619Y - No-load lossless electricity energy meter

Info

Publication number: CN2258619Y
Application number: CN 96209880
Authority: CN
Inventors: 于凤坤; 于凤彬
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-05-09
Filing date: 1996-05-09
Publication date: 1997-07-30
Anticipated expiration: 2006-05-09

Abstract

The utility model belongs to a meter for measuring and recording electric energy. The utility model fundamentally solves the problem of abrasion and loss during zero load of an electric energy meter. The zero-load lossless electric energy meter of the utility model is additionally provided with a voltage coil disconnecting circuit, a current detecting circuit, a current zero over circuit, a signal voltage circuit and an automatic alternate current electronic switch circuit in the existing widespread type electric energy meter in the inductive system. The utility model can accurately detect whether a user uses electricity. When the electricity is used, the utility model can measure and record the used electric energy. When the electricity is not used, the utility model has no loss.

Description

Unloaded lossless electric energy meter

The utility model belongs to the instrument of electric energy metrical, record.

The present induction energy meter that uses, has non-loadedly at no matter whether electricity consumption of user, and the potential winding of electric energy meter is charged all the time.That is to say, electric energy meter is connected in the electrical network, as long as electrical network has, the electric energy meter potential winding just has electric current to flow through, electric energy meter just exists power attenuation, active power loss by 0.5 grade and 1 grade single-phase electric energy meter voltage circuit of Chinese Industrial Standards (CIS) GB/T15283-1994 regulation is not more than 3W, apparent power loss is not more than 8VA, power attenuation when we are the electric energy meter zero load to not electricity consumption of user is called open circuit loss, because there is open circuit loss in electric energy meter, this is a big defective of present employed induction energy meter.

Purpose of design of the present utility model is: design the loss-free electric energy meter of a kind of zero load.

Design proposal of the present utility model is: unloaded lossless electric energy meter is to set up potential winding disconnecting circuit, current detection circuit, current over-zero circuit, signal voltage circuit, automatic AC electronic switching circuit formation in present popular induction energy meter.The utility model can detect the user exactly whether in electricity consumption, measures during electricity consumption, writes down used electric energy, and is lossless during not electricity consumption.

Organization plan is: unloaded lossless electric energy meter, it comprises potential winding (6), current coil (7), adopt potential winding disconnecting circuit (1), the potential winding of electric energy meter (6), 5. one terminates at terminal goes up through terminal and 4. arrives input power supply N, the other end of potential winding (6) is connected in the voltage disconnecting circuit (1)＜k〉point,＜k〉point by in the automatic AC electronic switching circuit (4)＜k point serial connection afterwards the terminal from 2. take back voltage disconnecting circuit (1) 2. go up, by terminal 2. through terminal 1. to input power supply A, the capacitor C in the current over-zero circuit (3) ₁Be connected in parallel two winding L that the current transformer LH in the current detection circuit (3) is elementary with potential winding (6) ₁, L ₂It is identical to be connected into the momentary current direction, produces the also identical circuit of instantaneous flow direction, and 1. input power supply A is introduced by terminal, through the elementary winding L of current transformer LH ₁And current coil (7) connects lead-out terminal and 3. arrives load R _f, 4. input power supply N is introduced by terminal, through another elementary winding L of current transformer LH ₂Connect lead-out terminal and 6. arrive load R _f, current transformer LH secondary winding L ₃Output terminals A, B connect input end A, B 2 points of signal voltage circuit (5).Four diode D in the signal voltage circuit (5) ₅, D ₆, D ₇, D ₈Form bridge rectifier circuit, capacitor C ₂, C ₃, C ₄Form absorption, filtering circuit, resistance R ₁, R ₂Form dividing potential drop, current-limiting circuit, resistance R ₁, R ₂Series connection back resistance R ₁Connect the negative electrode of rectifier bridge, resistance R ₂Connect the anode of rectifier bridge, capacitor C ₂With resistance R ₂Parallel connection, resistance R ₁, R ₂Dividing point F and automatic AC electronic switching circuit (4) in the trigger electrode of unidirectional controllable silicon S CR link to each other, signal voltage circuit (5) zero point current potential and the current potential at zero point of automatic AC electronic switching circuit (4) be connected to the O point, four diode D in the automatic AC electronic switching circuit (4) ₁, D ₂, D ₃, D ₄Be connected into bridge circuit, the anode of unidirectional controllable silicon S CR is connected on diode D ₁, D ₂Negative electrode on, the negative electrode of unidirectional controllable silicon S CR is connected on diode D ₃, D ₄Anode on, diode D ₁Anode and D ₃2. the tie point of the negative electrode 2. terminal that is connected in the potential winding disconnecting circuit (1) of correspondence goes up diode D ₂Anode and D ₄Tie point＜the k of negative electrode〉correspondence is connected in the potential winding disconnecting circuit (1)＜k〉point.

Principle of work: the utility model is seen accompanying drawing 1, and ultimate principle is the same with present popular induction energy meter.Different is, has adopted potential winding disconnecting circuit (1) between end of potential winding (6) and input power supply.In the potential winding disconnecting circuit (1)＜k〉point and the terminal automatic AC electronic switch of having contacted between 2..The opening or turn-off of automatic AC electronic switch determined potential winding (6) whether with power connection.Two winding L that current transformer LH in the current detection circuit (2) is elementary ₁, L ₂It is identical to be connected into the momentary current direction, produces the also identical circuit of magnetic flux instantaneous direction, sees accompanying drawing 3, and whether Current Transformer LH detects the user in electricity consumption.

When user power utilization, the electricity consumption electric current is just through the elementary winding L of current transformer ₁, L ₂, at the secondary winding L of current transformer LH ₃AC signal voltage of middle induction, this signal voltage is held output by A, B, deliver to the input end of signal voltage circuit (5), after signal voltage circuit (5) rectification, filtering, dividing potential drop, an AC signal voltage is become a direct-flow signal voltage, this direct-flow signal voltage is delivered to the trigger electrode of the unidirectional controllable silicon S CR in the automatic AC electronic switching circuit (4), by four diode D ₁, D ₂, D ₃, D ₄Form alternating current switching circuit with unidirectional controllable silicon S CR, the trigger electrode of unidirectional controllable silicon S CR receives dc trigger signal, the one-way SCR conducting.＜k〉to put and 2. connection automatically of terminal, potential winding (6) is connected the input power supply, and potential winding (6) gets electric work, cooperates with current coil (7) to produce driving torque, and electric energy meter measures, writes down used electric energy.

When the user stops electricity consumption, there be not the elementary winding L of electricity consumption electric current through current transformer ₁, L ₂, at the secondary winding L of current transformer LH ₃In do not produce induction AC signal voltage, there is not signal voltage by A, B holds output, the input end of signal voltage circuit (5), do not receive signal voltage, there is not direct-flow signal voltage to deliver to the trigger electrode of the unidirectional controllable silicon S CR in the automatic AC electronic switching circuit (4), the trigger electrode of unidirectional controllable silicon S CR does not receive dc trigger signal, one-way SCR turn-offs,＜k〉point and 2. automatic cutout of terminal, potential winding (6) disconnects the input power supply, potential winding (6) dead electricity is not worked, this moment, electric energy meter potential winding (6) two ends did not have voltage and working current, just there is not open circuit loss yet, thus normal First Astronautic Research Institute for Measurement and Test electric energy when making the utility model reach user power utilization, and there was not the purpose of loss in zero load when the user stopped electricity consumption.

The utility model is compared with popular induction energy meter, has when load is arranged and normally measures, and writes down used electric energy, and is lossless when unloaded, no shunt running, and highly sensitive characteristics, the utility model is packed into can reduce the line loss of electrical network in the electrical network.

Description of drawings:

Fig. 1 is the utility model electrical schematic diagram.

Fig. 2 is automatic AC electronic switch and signal voltage circuit theory diagrams.

Fig. 3 is the elementary winding L of current transformer LH ₁, L ₂The coiling synoptic diagram.

Fig. 1, Fig. 2, Fig. 3 are a kind of embodiment of the present utility model.

Implement: at first make printed-wiring board (PWB)s, purchase electronic devices and components with reference to accompanying drawing 2, then with reference to instructions the 5th part and accompanying drawing 1, accompanying drawing 2, accompanying drawing 3 install, debugging gets final product.

Claims

1, unloaded lossless electric energy meter, it comprises potential winding (6), current coil (7), it is characterized in that: adopt potential winding disconnecting circuit (1), the potential winding of electric energy meter 6), 5. one terminates at terminal goes up through terminal and 4. arrives input power supply N, the other end of potential winding (6) is connected in the voltage disconnecting circuit (1)＜k〉point,＜k〉point by in the automatic AC electronic switching circuit (4)＜k point serial connection afterwards the terminal from 2. take back voltage disconnecting circuit (1) 2. go up, by terminal 2. through terminal 1. to input power supply A, the capacitor C in the current over-zero circuit (3) ₁Be connected in parallel two winding L that the current transformer LH in the current detection circuit (2) is elementary with potential winding (6) ₁, L ₂It is identical to be connected into the momentary current direction, produces the also identical circuit of instantaneous flow direction, and 1. input power supply A is introduced by terminal, through the elementary winding L of current transformer LH ₁And current coil (7) connects lead-out terminal and 3. arrives load R _f, 4. input power supply N is introduced by terminal, through another elementary winding L of current transformer LH ₂Connect lead-out terminal and 6. arrive load R _f, current transformer LH secondary winding L ₃Output terminals A, B connect input end A, B 2 points of signal voltage circuit (5).

2, according to the lossless electric energy meter of claim 1 described zero load, it is characterized in that: four diode D in the signal voltage circuit (5) ₅, D ₆, D ₇, D ₈Form bridge rectifier circuit, capacitor C ₂, C ₃, C ₄Form absorption, filtering circuit, resistance R ₁, R ₂Form dividing potential drop, current-limiting circuit, resistance R ₁, R ₂Series connection back resistance R ₁Connect the negative electrode of rectifier bridge, resistance R ₂Connect the anode of rectifier bridge, capacitor C ₂With resistance R ₂Parallel connection, resistance R ₁, R ₂Dividing point F and automatic AC electronic switching circuit (4) in the trigger electrode of unidirectional controllable silicon S CR link to each other, the current potential at zero point of the zero potential of signal voltage circuit (5) and automatic AC electronic switching circuit (4) is connected to the O point, four diode D in the automatic AC electronic switching circuit (4) ₁, D ₂, D ₃, D ₄Be connected into bridge circuit, the anode of unidirectional controllable silicon S CR is connected on diode D ₁, D ₂Negative electrode on, the negative electrode of unidirectional controllable silicon S CR is connected on diode D ₃, D ₄Anode on, diode D ₁Anode and D ₃2. the tie point of the negative electrode 2. terminal that is connected in the potential winding disconnecting circuit (1) of correspondence goes up diode D ₂Anode and D ₄Tie point＜the k of negative electrode〉correspondence is connected in the potential winding disconnecting circuit (1)＜k〉point.