CN101487855A - Method for automatically recording voltage-losing meter-leaking electric energy in three-phase three-wire electric energy measurement - Google Patents
Method for automatically recording voltage-losing meter-leaking electric energy in three-phase three-wire electric energy measurement Download PDFInfo
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- CN101487855A CN101487855A CNA2009100374390A CN200910037439A CN101487855A CN 101487855 A CN101487855 A CN 101487855A CN A2009100374390 A CNA2009100374390 A CN A2009100374390A CN 200910037439 A CN200910037439 A CN 200910037439A CN 101487855 A CN101487855 A CN 101487855A
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Abstract
The invention discloses a method for automatically recording pressure loss leakage electric energy in three-phase three-wire electrical metering, and is characterized in that: (1) the voltage and current signals of the load circuit are collected; (2) a sample/hold circuit samples the alternating current signals of voltage and current in each period; (3) digital quantity is converted to access a data memory through an A/D converting circuit; (4) a logical operation circuit calculates actually calculated active energy W and actually calculated reactive energy Q; (5) whether three phases have any phase to be disconnected is judged; (6) if the phase is disconnected, the logical operation circuit further records the calculated active energy W and reactive energy Q when disconnection in the step (4); simultaneously, the active energy W' and reactive energy Q' of load consumption are calculated according to principle of shifting; (7) the active energy W'-W and reactive energy Q'-Q of leakage are calculated when disconnection; the invention further discloses an electric energy meter, and is characterized in that the electric energy meter comprises a collection data circuit of the electric energy meter, the sample/hold circuit, the A/D converting, the original data memory and the logical operation circuit that are connected in turn. The invention solves the problem of remedying pressure loss leakage electric energy in three-phase three-wire electrical metering, thereby improving the accuracy of remedying pressure loss leakage electric energy and combining the recorded pressure loss leakage electricity meter with the electric energy meter.
Description
[technical field]
The present invention relates to a kind of in the phase three-wire three electric energy metrical the automatically method and the electric energy meter thereof of recording pressure loss leakage meter electric energy, be generally used for measuring in the electric system method and the device of active energy, reactive energy.
[background technology]
When causing electric energy meter that one phase voltage decompression is arranged because of a variety of causes in the phase three-wire three electric energy metrical, electric energy meter can leak the meter electric energy.Existing various remedy with Louing the mode of meter electric energy exist calculate inaccurate or workload too greatly or the too high shortcoming of expense.
The present invention has carried out useful improvement in order to overcome above shortcoming.
[summary of the invention]
The present invention has overcome the deficiencies in the prior art, and the electric energy of the automatic recording pressure loss hourglass of a kind of energy meter is provided, and can also finish the method and the device of common electric energy table function simultaneously.So be called " electric energy meter of recording pressure loss leakage meter electric energy automatically ".
The present invention be based on the electric power system three-phase voltage substantially symmetry (the three-phase voltage amplitude equates, the phasing degree differs 120 °) design, the impossible absolute symmetry of certain actual three-phase voltage, but, in fact asymmetrical component very little, for example: reactive energy-meter is based on also that the basic symmetric design of three-phase voltage forms, and accuracy is only than the low grade of active electric energy meter of the same type.As 1 grade of active electric energy meter, reactive energy-meter of the same type then is 2 grades.By that analogy, the present invention is based on also that the basic symmetric design of three-phase voltage forms, and the class of accuracy that record leaks the meter electric energy is only than itself the active energy accuracy of measuring low grade.
In order to solve the technical matters of above-mentioned existence, the present invention adopts following technical proposal:
A kind of in the phase three-wire three electric energy metrical the automatic method of recording pressure loss leakage meter electric energy, it is characterized in that:
(1) the electric energy meter data collection circuit is collected voltage, the current signal on the load circuit;
(2) by sample/hold circuit the AC signal of voltage, electric current is being sampled N time in the phase weekly;
(3) then through the A/D change-over circuit, convert digital quantity to and deposit data-carrier store in;
(4) logical operation circuit calculates actual active energy W, reactive energy Q by electric energy meter active energy, reactive energy computing formula; In three-phase three-wire circuit, electric energy meter is measured Uab, Ucb, Ia, Ic deposit in the storer, calculate actual count active energy
Reactive energy
(5) judge whether any phase phase failure decompression is arranged in the three-phase;
(6) if phase failure decompression is arranged, logical operation circuit also write down above-mentioned (4) step when the phase failure actual count active energy W, reactive energy Q; Simultaneously, when the phase failure of A phase, use
Replace in electric energy meter active energy, the reactive energy computing formula
, when the phase failure of B phase, use
Replace in electric energy meter active energy, the reactive energy computing formula
With
Replace in electric energy meter active energy, the reactive energy computing formula
When the phase failure of C phase, use
Replace in electric energy meter active energy, the reactive energy computing formula
And calculate active energy W ', the reactive energy Q ' of load consumption;
(7) logical operation circuit (L) calculates phase failure hourglass in respect of merit electric energy=W '-W, leakage meter reactive energy=Q '-Q;
Realize a kind of electric energy meter of said method, it is characterized in that comprising electric energy meter collection data circuit, sample/hold circuit, A/D change-over circuit, raw storage, logical operation circuit; Electric energy meter is collected the input end of the output terminal connection sample/hold circuit of data circuit, the output terminal of sample/hold circuit connects the input end of A/D change-over circuit, the output terminal of A/D change-over circuit connects the input end of data-carrier store, and the output terminal of data-carrier store connects logical operation circuit.
The present invention compared with prior art has following advantage: the present invention will not only solve the difficulty of remedying pressure loss leakage meter electric energy, also improve the accuracy of remedying pressure loss leakage meter electric energy greatly, and recording pressure loss leakage quantity calculation and electric energy meter are integrated.
[description of drawings]
Fig. 1 is block scheme of the present invention (one);
Fig. 2 is block scheme of the present invention (two);
Fig. 3 is electric energy meter data collection circuit figure of the present invention;
Fig. 4 is a concrete block scheme of the present invention;
Fig. 5 is phasor principle analysis figure of the present invention ();
Fig. 6 is phasor principle analysis figure of the present invention (two);
Fig. 7 is phasor principle analysis figure of the present invention (three);
Fig. 8 is A of the present invention, B, C phase phase failure discriminatory analysis figure ();
Fig. 9 is A of the present invention, B, C phase phase failure discriminatory analysis figure (two);
Figure 10 is a circuit distribution plan of the present invention.
[embodiment]
Below in conjunction with accompanying drawing and embodiment the present invention is described in further detail:
A kind of in the phase three-wire three electric energy metrical the automatic method of recording pressure loss leakage meter electric energy, as Fig. 1, Fig. 2, comprise at least:
(1) electric energy meter data collection circuit H collects voltage, the current signal on the load circuit, above-mentioned signal is input to the analog quantity input interface of single-chip microcomputer;
As shown in Figure 3, the voltage of high voltage supply system is that to become low-voltage be secondary voltage to primary voltage through insurance and high pressure measurement voltage transformer (VT) (TV1) with high voltage, electric current becomes secondary current through high pressure measurement current transformer (TA1) with primary current, respectively through showing interior voltage transformer (VT) (TV2), current transformer (TA2), be incorporated into the analog quantity input interface of single-chip microcomputer then;
(2) by sample/hold circuit I with the AC signal of voltage, electric current N time (as N=36) of sampling in phase weekly;
(3) then through A/D change-over circuit J, analog quantity is become digital quantity deposit data-carrier store K in;
(4) logical operation circuit L calculate the reality meter active energy W, actual reactive energy Q;
When phase failure decompression does not take place when, the reality meter active energy, reactive energy reflected the electric energy of user load normal consumption, leak active energy, the reactive energy of meter this moment.At this moment, be equivalent to common electric energy meter function.
But when load circuit generation phase failure decompression, just record leaks the meter electric energy:
(5) judge whether any phase phase failure decompression is arranged in the three-phase;
(6) if decompression is arranged, logical operation circuit also write down above-mentioned (4) step when phase failure decompression actual count active energy W, reactive energy Q; Simultaneously, adopt the phase shift of non-decompression voltage or adopt the mode of non-decompression phase current phase shift to obtain and the decompression voltage and the decompression phase current phase product that equate of virtual voltage mutually according to the characteristic of three-phase voltage symmetry, thereby calculate active energy W ', the reactive energy Q ' of load consumption according to the characteristic of three-phase current symmetry;
(7) logical operation circuit (L) calculates phase failure hourglass in respect of merit electric energy=W '-W, leakage meter reactive energy=Q '-Q.
Embodiments of the invention are that the high pressure measurement mode of using with the phase three-wire three high voltage supply system (Fig. 3) is an example, introduce its principle of work in conjunction with the principle of work block diagram (Fig. 4) of the electric energy meter of the automatic recording pressure loss leakage meter of phase three-wire three electric energy:
In three-phase three-wire circuit, electric energy meter is measured Uab, Ucb, Ia, Ic deposit in the storer.Calculate actual count active energy
Reactive energy
(Φ a, φ c see Fig. 5, Fig. 6, Fig. 7).Uab represents to survey AB phase line voltage phasor
Effective value, Ia represents phasor
Effective value, φ a represents phasor
With phasor
Angle; Ucb represents to survey CB phase line voltage phasor
Effective value, Ic represents phasor
Effective value, φ c represents phasor
With phasor
Angle;
The expression sampling interval time.
If existing A phase fuse melting, A phase decompression then,
Voltage can connect the load difference according to secondary circuit, and amplitude can reduce, even reduces to 0, if residual voltage is arranged, its phasing degree also can change.So active energy formula at this moment
In also calculate the actual active energy W that records when then only reflecting A phase fuse melting with the actual Uab that comes that measures
A, and the active energy that not reflected load consumes, this will cause the loss of metering active energy.Active energy W ' for reflected load consumption
A, symmetrical substantially according to the electrical network three-phase voltage, can use
Amplitude replace Uab, as shown in Figure 5, will
Moving 60 ° backward is
Promptly use
(use
Expression) replaces in the active energy formula
(W '
A-W
A) being the active energy of A phase decompression hourglass meter, each time sampling period is added up is whole A phase decompression is leaked meter in the time active energy; (Q '
A-Q
A) be the reactive energy of A phase decompression hourglass meter.
When the phase failure of B phase, as shown in Figure 7, at this moment
With
Amplitude and phase place all change, but their difference equals
Will
Move forward 60 ° promptly
(use
Expression) can replace
Will
After move 60 ° promptly
(use
Expression) can replace
(W '
B-W
B) being the active energy of B phase decompression hourglass meter, each time sampling period is added up is whole B phase decompression is leaked meter in the time active energy (W
BThe actual active energy that records during reflection B phase fuse melting, W '
BThe active energy that reflected load consumes); (Q '
B-Q
B) be the reactive energy of B phase decompression hourglass meter.
When the phase failure of C phase, can use
Amplitude replace Ucb, as shown in Figure 6, will
Be for 60 ° to reach
Promptly use
(use
Expression) replaces in the active energy formula
(W '
C-W
C) being the active energy of C phase decompression hourglass meter, each time sampling period is added up is whole C phase decompression is leaked meter in the time active energy (W
CThe actual active energy that records during reflection C phase fuse melting, W '
CThe active energy that reflected load consumes); (Q '
C-Q
C) be the reactive energy of C phase decompression hourglass meter.
In when, decompression not taking place when, meritorious, reactive energy that the above-mentioned skew principle of unnecessary employing computational load consumes.In order to guarantee only when decompression takes place, just the calculating of utilization skew principle is provided with decompression starting current value and decompression trigger voltage value and return voltage value.Satisfy 2 conditions when simultaneously, A, arbitrary phase current are more than or equal to the decompression starting current value of setting; B, the voltage that records are less than or equal to the decompression trigger voltage value of setting; Just calculate and recording pressure loss leakage meter electric energy.
Be decompression prerequisite be must have a phase current more than or equal to a certain setting value (as ratings 0.5%), believe 1. for control among Fig. 8, start, return comparer by 1. controlling decompression, when Ia, Ic biphase current during all less than starting current, then control signal is forbidden in comparer output, the control of back forbids that full controlled variable is output as 0; When a phase current is arranged in the biphase current more than or equal to starting current, then allow relatively.
Fig. 9, control letter 1. output allow under the situation relatively, determine the end and be which the phase decompression in A, B, the C three-phase, then by corresponding phase line voltage with start the return voltage setting value and relatively determine.First kind of situation: Uab be less than or equal to decompression start setting value (as ratings 78%) through relatively back output " 1 ", Uac is less than or equal to decompression and is started setting value through relatively back output " 1 ", 4. two " 1 " produces through AND gate, and signal is " 1 ", at this moment Uab, Uac are lower than decompression startup setting value, expression is the phase failure of " B " phase, and 4. signal calculates according to the situation of " B " phase phase failure with regard to may command active energy, reactive energy formula.Second kind of situation: Uab is less than or equal to decompression and started setting value through relatively back output " 1 ", Uac is higher than decompression and starts setting value through relatively back output " 0 ", can producing 3. as shown in Figure 9, signal is " 1 ", at this moment expression is the phase failure of " A " phase, and 3. signal calculates according to the situation of " A " phase phase failure with regard to may command active energy, reactive energy formula.The third situation: Uab is higher than decompression and starts setting value through relatively back output " 0 ", Uac is less than or equal to decompression and is started setting value through relatively back output " 1 ", can producing 2. as shown in Figure 9, signal is " 1 ", at this moment expression is the phase failure of " C " phase, and 2. signal calculates according to the situation of " C " phase phase failure with regard to may command active energy, reactive energy formula.
Line voltage is lower than that decompression starts when starting the return voltage setting value, produces control signal 2., 3., 4., allows phase shift and subsequent adds, takes advantage of, subtracts, adds up Lou in respect of merit, reactive energy.Voltage be equal to or higher than return setting value (as ratings 85%) time decompression return, stop phase shift and subsequent add, take advantage of, subtract, add up Lou in respect of merit, reactive energy.
Certainly, we can also adopt method for distinguishing to judge which phase decompression in A, B, the C three-phase.
As seen from the figure, leak the calculating of meter reactive energy and above-mentioned leakage seemingly in respect of the compute classes of merit electric energy, all be with correct voltage, principle according to the basic symmetry of three-phase voltage, with its phase shift, obtain the required correct voltage of respective element, and calculate correct reactive energy, the reactive energy of the real meter of counter element when deducting decompression again, thus the leak reactive energy of meter obtained.
Among the figure fundamental diagram that draws with the voltage phase shift, because the phase differential of voltage and electric current is a relative value; So, adopt the mode of non-decompression phase current phase shift also can draw same result according to the characteristic of three-phase current symmetry.
A kind of in the phase three-wire three electric energy metrical the automatic electric energy meter of recording pressure loss leakage meter electric energy, it is characterized in that comprising that electric energy meter collects data circuit, sample/hold circuit, A/D change-over circuit, raw storage, logical operation circuit; Electric energy meter is collected the input end of the output terminal connection sample/hold circuit of data circuit, the output terminal of sample/hold circuit connects the input end of A/D change-over circuit, the output terminal of A/D change-over circuit connects the input end of data-carrier store, and the output terminal of data-carrier store connects logical operation circuit.
Claims (2)
1, a kind of in the phase three-wire three electric energy metrical the automatic method of recording pressure loss leakage meter electric energy, it is characterized in that:
(1) the electric energy meter data collection circuit is collected voltage, the current signal on the load circuit;
(2) by sample/hold circuit the AC signal of voltage, electric current is being sampled N time in the phase weekly;
(3) then through the A/D change-over circuit, convert digital quantity to and deposit data-carrier store in;
(4) logical operation circuit calculates actual active energy W, reactive energy Q by electric energy meter active energy, reactive energy computing formula; In three-phase three-wire circuit, electric energy meter is measured Uab, Ucb, Ia, Ic deposit in the storer, calculate actual count active energy
, reactive energy
(5) judge whether any phase phase failure decompression is arranged in the three-phase;
(6) if phase failure decompression is arranged, logical operation circuit also write down above-mentioned (4) step when the phase failure actual count active energy W, reactive energy Q; Simultaneously, when the phase failure of A phase, use
Cd-j60 ° replaces in electric energy meter active energy, the reactive energy computing formula
Ab, when the phase failure of B phase, use (
Ab-
Cb) e
J60 °Replace in electric energy meter active energy, the reactive energy computing formula
Ab, with (
B-
Ab) e-j60 ° replaces in electric energy meter active energy, the reactive energy computing formula
Cb uses when the phase failure of C phase
Ab e
J60 °Replace in electric energy meter active energy, the reactive energy computing formula
Cb, and calculate active energy W ', the reactive energy Q ' of load consumption;
(7) logical operation circuit (L) calculates phase failure hourglass in respect of merit electric energy=W '-W, leakage meter reactive energy=Q '-Q.
2, realize a kind of electric energy meter of claim 1 method, it is characterized in that comprising electric energy meter collection data circuit, sample/hold circuit, A/D change-over circuit, raw storage, logical operation circuit; Electric energy meter is collected the input end of the output terminal connection sample/hold circuit of data circuit, the output terminal of sample/hold circuit connects the input end of A/D change-over circuit, the output terminal of A/D change-over circuit connects the input end of data-carrier store, and the output terminal of data-carrier store connects logical operation circuit.
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