CN1415075A - Electronic watt-hour meter - Google Patents
Electronic watt-hour meter Download PDFInfo
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- CN1415075A CN1415075A CN00818049.0A CN00818049A CN1415075A CN 1415075 A CN1415075 A CN 1415075A CN 00818049 A CN00818049 A CN 00818049A CN 1415075 A CN1415075 A CN 1415075A
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Abstract
An electronic watt-hour meter having a function of cutting off a load when detecting a consumed power limit and requiring no special current sensing means because the consumed power limit is detected with the electric energy. Uneven power distribution that the maximum consumed power at the end of the distribution line is less than the others due to the lower supply voltage at the end is prevented. Power/frequency converting means multiplies the voltage signal by the current signal and outputs power pulses proportional to the electric energy. A limit power judging section counts the power pulses for a predetermined time and outputs a load cutoff signal if the count exceeds a predetermined load cutoff value. A warning output level of a warning value smaller than the load cutoff value is set, thereby issuing a warning before the load is cut off.
Description
Technical field
The present invention relates to have the use power detection mode of the electronic watt-hour meter that uses the Power Limitation function.
Background technology
Fig. 8 is the disclosed existing block diagram that has the electric energy meter of load current limit function of Japanese kokai publication hei 11-273538 communique for example.
In the drawings, the 1st, the electric energy meter, the 2nd, the link stroma of electric energy meter 1,1S, 2S, 3S are the terminals of mains side, 1L, 2L, 3L are the terminals of load-side.The 3rd, obtain the current transformer (CT) of the secondary output that is directly proportional with load current, the 4th, with the multiply each other electric energy metrical portion of the calculating of carrying out electric energy of the secondary output of current transformer 3 and voltage, the 5th, the display part that the operation result of electric energy metrical portion 4 accumulative total is shown, the 6th, measure the size loads current measurement portion of load current according to the secondary output of current transformer 3, the 7th, judge whether the electric current that load current measurement section 6 is measured surpasses the current limit value detection unit that limits electric current, the 8th, the load switch control part, continue to surpass the contract current value regulation time limit when above at the measured value of load current measurement section 6, current limit value detection unit 7 output signals, make load switch 9 actions, cut off electric power supply load.Electric energy metrical portion 5, electrical power limit value detection unit 7, load switch control part 8 etc. are by the not shown CPU control that goes out.
The 10th, according to the load condition test section of the on off state of the voltage detecting load switch 9 of load-side, the 11st, carry out the operating portion that load switch 9 was set and connected once again to ratings, the 12nd, the control power supply unit of the generation usefulness of the power supply of the electronic circuit that comprises CPU in the electric energy meter 1, display device etc.
Action to above-mentioned electric energy meter 1 is illustrated below.Current limit value detection unit 7 makes load switch 9 actions when surpassing predetermined contract current value more than the lasting official hour of current value that load current measurement section 6 is measured, cut off the electric power supply to load, makes display part 5 show the action of load switch 9 simultaneously.
The aforesaid existing electric energy meter that has load current limit mechanism is used to normally to prevent to need that the user of electric power is temporary transient uses the high-power electric power supply deficiency that causes, and steadily turns to the electric energy of purpose in electricity usage.But, not to detect with detection means to use power, detect using power limit above the contract current value but replace according to load current, cut off load switch 9, carry out the electricity usage restriction.
Therefore, the current detecting means must be set especially.And for the user who needs electric power at the end of distribution line etc., because supply voltage is low, the maximum power that uses is also just few, causes inequitable situation.
And, for multiunit electric energy meters such as single-phase 3 line formulas shown in Figure 8,, the electric current of a unit also can cut off load even surpassing the contract current value, and be disadvantageous for electricity usage person.
The present invention makes for addressing the above problem, and providing does not need special current detecting means, and is unfavorable with electric current enforcement use Power Limitation, but electric energy is detected, and cuts off load then or sends the electronic watt-hour meter of warning.
Summary of the invention
Electronic watt-hour meter of the present invention possesses voltage signal and current signal is multiplied each other, export the power/frequency shift means of the pulse that is directly proportional with electric energy and count the shutoff signal output means of output shutoff signal when this count value surpasses predetermined cut-out load respective value with the time limit pair pulse that is directly proportional with this electric energy of regulation; Do not need special current detecting means, can eliminate the unfairness of user on the power-limiting that cuts off load that the difference owing to distribution voltage causes needing electricity consumption.
Again, owing to possess voltage signal and current signal multiplied each other, the power/frequency shift means of the pulse that is directly proportional with electric energy of output and count in the time limit pair pulse that is directly proportional with electric energy of stipulating, when this count value surpassed predetermined warning analog value, the warning output means of the too much alarm of power was used in output; Need can to suppress the user's of electricity consumption use power, seek to prevent the electric power supply scarce capacity, make the electricity usage stabilization.
Also have, possess with the time limit pair pulse that is directly proportional with electric energy of regulation and count, when surpassing predetermined cut-out load respective value, this count value is judged to be above power-limiting, the shutoff signal output means of output load shutoff signal, and set the relation of cutting off load respective value＞warning respective value, output alarm signal before cutting off load; The unexpected cut situation of load that therefore can prevent the user who needs electricity consumption takes place.
And if the counted number of pulses in next time limit is less than the warning respective value under the situation of the output of reporting to the police, just cancellation is reported to the police and is exported.
Again, electric energy meter of the present invention is the electronic watt-hour meter with power/frequency shift means of a plurality of unit, output alarm signal when the some pulses that is directly proportional with electric energy in each unit of counting in each regulation time limit surpass predetermined warning analog value, therefore, be partial to a phase time of single-phase 3 line formula distribution at use power, in case at power-limiting with the electric current overrate of interior distribution line with regard to output alarm signal, just make power consumer recognize that the electric current of a phase is excessive, impel it before fuse or distribution are with switch motion, to take some countermeasures.Then, if whole counted number of pulses of a plurality of unit are less than the warning respective value in next time limit under the situation of output of reporting to the police, just cancellation is reported to the police and is exported.
Summary of drawings
Fig. 1 is the block diagram of the electronic watt-hour meter of the invention process form 1.
Fig. 2 is the block diagram of the Power arithmetic circuit of example 1.
Fig. 3 is the process flow diagram of the power-limiting detection unit of example 1.
Fig. 4 is the key diagram of the time limit action of example 1.
Fig. 5 is the block diagram of the Power arithmetic circuit of the invention process form 2.
Fig. 6 is the action flow chart of the single-phase power detection unit of example 2.
Fig. 7 is the key diagram of the operation time limit of example 2.
Fig. 8 is the existing structural drawing that has the electric energy meter of load current limit mechanism.
Concrete example
Example 1
Fig. 1 is the block diagram of the electronic watt-hour meter of the invention process form 1.Fig. 2 is the block diagram of Power arithmetic circuit of the electronic watt-hour meter of example 1.
In the drawings, the part mark identical symbol identical with above-mentioned existing device omits its explanation.The 20th, the Power arithmetic circuit, the 21st, with the aanalogvoltage of input, the A/D translation circuit of current signal digital quantization, the 22nd, voltage, the current signal that quantizes multiplied each other, the power/frequency translation circuit of the pulse that is directly proportional with electric energy of output, this Fig. 2 represent to possess the Power arithmetic circuit of the power/frequency translation circuit 22 of two unit.Power/frequency computing circuit 22 can determine meter constant, for example is decided to be 1000 pulses/1KWs, and the pulse number in the time limit of regulation is counted, and it is scaled electric energy in this time limit.The 23rd, the additive operation adder operation circuit is carried out in the output of the power/frequency translation circuit 22 of Unit 2, the 25th, the electrical energy pulse that additive operation is obtained carries out the summary counter of accumulative total.Calculate electric energy and it is sent to display part 5 carries out numerical value and show from this aggregate-value according to above-mentioned pulse constant.
The 30th, power-limiting detection unit, the 31st, time limit generating unit.Time limit generating unit 31 is according to the time limited signal of the clock signal generation some cycles t of the CPU of this electronic watt-hour meter of control.Whether the judgement of power-limiting is to judge above the contract electric energy of corresponding decision with the time limit according to the average power in the predetermined time limit T (for example 3～15 minutes).
Fig. 3 is the action flow chart of the power-limiting detection unit of example 1.Fig. 5 is time limit action specification figure.Power-limiting detection unit 30 possesses the storer that is made of n data block.And be in the relation of time limit T=n * t.In regular turn electrical energy pulse is counted and is recorded at each certain cycle t of time limited signal on n the data block of storer.
At first, the electrical energy pulse count recording during the 1st the cycle t on No. 1 data block (step 41,42).Begin through time limit T record electrical energy pulse counting (step 43) on all n data block from rising edge.From this each cycle t constantly, storer is with the form of first in first out new data (step 45,45) more.Calculate the electrical energy pulse sum Z (step 46) in the storer then.The warning (step 47,48) that when this pulse sum Z surpasses predetermined warning output respective value, overuses to outputs such as display part 5 expression electric power.Also have, the shutoff signal (step 49,50) of load switch 9 is cut off in output when pulse sum Z surpasses the Power Limitation respective value.If take to alleviate the measure of load at the time power consumer of output alarm, next cycle t reports to the police and is lower than the warning respective value when output is judged, then cancels the warning output (step 51,52) of sending.
Like this,, just cut off load, prevent that electricity needs from increasing in case the moving average of the power that uses at time limit T surpasses the contract power-limiting.Before reaching the contract power-limiting,, impel power consumer to reduce load for example the output of reporting to the police in 80% o'clock that reaches the contract power-limiting again.As the output of reporting to the police, can also can be chimes of doom, sound, warning partials at the warning literal of display part display flashing, or both dual-purposes.
Owing to be as mentioned above, to the output pulse of power/frequency translation circuit 22, carry out whether surpassing the judgement that power-limiting cuts off load with the moving average of time limit T, do not need special current detecting means.So, can eliminate the unfairness of the cut-out load limitations power that the distribution voltage difference of electricity consumer causes.
Again, in the above description, utilizing the moving average of the power that uses at time limit T to judge whether surpass power-limiting, is to surpass power-limiting for what the factors such as starting current that prevent motor caused in the short time, causes the cut situation of load to take place.
Above described be to have the electronic watt-hour meter of the power/frequency of 2 unit translation circuit 22 to describe with possessing of using in single-phase 3 line formulas, the three-phase 3 line formula distribution, but can be applicable to that 1 unit that single-phase 2 line formulas, three-phase 5 line formula distribution are used and the electronic watt-hour meter this point of 3 unit are obvious.
Example 2
In the electronic watt-hour meter of the single-phase 3 line formula distribution shown in the above-mentioned example 1, be partial at the power that uses under the situation of a phase, electric energy based on a phase, carry out judgement about report to the police output and power-limiting, therefore, may flow through 200% the electric current that is ratings to the maximum on phase line.The isolating switch that fuse that is provided with on the distribution line or distribution are used can carry out overcurrent protection, but under the situation of the "on" position of overrate below 200%, and the isolating switch that fuse or distribution are used moves the needed time and reaches more than several minutes.Make the excessive advisory electricity consumer of a phase current of this section period distribution line the structure of its usefulness that takes some countermeasures be shown in this example 2.
Fig. 5 is the block diagram of Power arithmetic circuit of the electronic watt-hour meter of the invention process form 2.Fig. 6 is the action flow chart of the single-phase power detection unit of example 2.Fig. 7 is time limit action specification figure.
In the drawings, identical with above-mentioned example 1 part is marked with identical symbol and omits its explanation.The 42nd, the single-phase power detection unit of each power/frequency translation circuit 22.Single-phase power detection unit 42 has the counter that the output pulse of 2 power/frequency translation circuits 22 is counted respectively.Single-phase power judges that time limit T0 tries to achieve according to the time limit pulse of the some cycles t of time limit generating unit 31 generations.This single-phase power judges that time limit T0 also can be with identical at the time limit T that asks moving average of above-mentioned example 1 explanation.Can set with other timer arrangement again.
The process flow diagram that utilizes Fig. 6 below is illustrated the action of the single-phase power detection unit of example 2.Output pulses to the output of each power/frequency translation circuit 22 of each time limit T0 is counted (step 61～62) respectively.If each count value P1, P2 surpass predetermined warning respective value, just send warning output order (step 63～66).Decision is equivalent to 120～150% value of rated current to this warning respective value according to above-mentioned meter constant and time limit T0.In the moment that the counting from output pulses begins to pass through time limit T0,, just continue to send alarm command, and, make it enter next time limit (step 67,68,71) this counter O reset if any one among count value P1, the P2 surpasses the warning respective value.If count value P1, P2 both are less than the warning respective value, then the phase line current is not high, is in the normal range, if therefore transmitting messages alert instruction, just with its cancellation.
The invention process form 2 since the phase time that the power that uses is partial to single-phase 3 line formula distributions at power-limiting with the electric current overrate output alarm signal of interior meeting at distribution line, therefore can before the isolating switch action that fuse or distribution are used, it be taken some countermeasures.
Industrial applicability
The present invention relates to the use power detection mode with the electronic watt-hour meter that uses the Power Limitation function.
Claims (6)
1. electronic watt-hour meter, it is characterized in that, the voltage signal and the current signal that possess input multiply each other, the power/frequency shift means of the pulse that output is directly proportional with electric energy, the pulse that will be directly proportional accumulative total with described electric energy, carry out display part that the metering of electric energy shows and count with the time limit pair pulse that is directly proportional with described electric energy of regulation, the power that is judged to be use when this count value surpasses predetermined cut-out load respective value surpasses power-limiting, the shutoff signal output means of output load shutoff signal.
2. electronic watt-hour meter, it is characterized in that, the voltage signal and the current signal that possess input multiply each other, the power/frequency shift means of the pulse that output is directly proportional with electric energy, the pulse that will be directly proportional accumulative total with described electric energy, carry out display part that the metering of electric energy shows and count with the time limit pair pulse that is directly proportional with described electric energy of regulation, when this count value surpasses predetermined warning respective value, the alerting signal output means of the alerting signal that the power that the output expression is used is too much.
3. electronic watt-hour meter according to claim 2 is characterized in that,
Also possess with the time limit pair pulse that is directly proportional with electric energy of regulation and count, the power that is judged to be use when this count value surpasses predetermined cut-out load respective value surpasses power-limiting, the shutoff signal output means of output load shutoff signal;
Predetermined cut-out load respective value and warning respective value are set the relation of cutting off load respective value＞warning respective value, the described warning of output before cutting off load.
4. according to claim 2 or 3 described electronic watt-hour meters, it is characterized in that,, just cancel described warning output if the counted number of pulses in next time limit is less than the warning respective value under the situation of the output of reporting to the police.
5. according to each the described electronic watt-hour meter in the claim 1～4, it is characterized in that, described electronic watt-hour meter is used for single-phase 3 line circuits, power/frequency shift means with a plurality of unit, in described electric energy meter, the single-phase power detection unit of output alarm signal when possessing some pulses that is directly proportional with electric energy in described each unit of counting in each regulation time limit and surpassing predetermined warning analog value.
6. electronic watt-hour meter according to claim 5 is characterized in that,
Under the situation about exporting of reporting to the police,, just cancel described warning output if whole counted number of pulses of a plurality of unit are less than the warning respective value in next time limit.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2000/007000 WO2001099323A1 (en) | 2000-06-21 | 2000-10-06 | Data transmission system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1415075A true CN1415075A (en) | 2003-04-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN00818049.0A Pending CN1415075A (en) | 2000-10-06 | 2000-11-01 | Electronic watt-hour meter |
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| CN (1) | CN1415075A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100348984C (en) * | 2006-01-24 | 2007-11-14 | 北京万工科技有限公司 | Electric energy metrical pulse generation method for ammeter |
| CN100443905C (en) * | 2006-12-15 | 2008-12-17 | 北京中星微电子有限公司 | Apparatus for generating signals against fraudulent using electricity |
| CN114746974A (en) * | 2019-11-27 | 2022-07-12 | 三菱电机株式会社 | Electronic circuit breaker and circuit breaker system |
-
2000
- 2000-11-01 CN CN00818049.0A patent/CN1415075A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100348984C (en) * | 2006-01-24 | 2007-11-14 | 北京万工科技有限公司 | Electric energy metrical pulse generation method for ammeter |
| CN100443905C (en) * | 2006-12-15 | 2008-12-17 | 北京中星微电子有限公司 | Apparatus for generating signals against fraudulent using electricity |
| CN114746974A (en) * | 2019-11-27 | 2022-07-12 | 三菱电机株式会社 | Electronic circuit breaker and circuit breaker system |
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