CN109001547A - A kind of power distribution voltage imbalance judgment method based on metering centralized meter reading terminal data - Google Patents
A kind of power distribution voltage imbalance judgment method based on metering centralized meter reading terminal data Download PDFInfo
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- CN109001547A CN109001547A CN201710425640.0A CN201710425640A CN109001547A CN 109001547 A CN109001547 A CN 109001547A CN 201710425640 A CN201710425640 A CN 201710425640A CN 109001547 A CN109001547 A CN 109001547A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/16—Measuring asymmetry of polyphase networks
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Abstract
The present invention provides a kind of power distribution voltage imbalance judgment method based on metering centralized meter reading terminal data, and this method calculates the non-equilibrium among three phase voltages of each data break of the distribution transforming according to the calculation method of non-equilibrium among three phase voltages in certain time length；Judge whether each phase voltage situation of each data break has reached the threshold values of judgement；When each phase voltage situation has reached the threshold values of judgement, judge whether the non-equilibrium among three phase voltages of each data break have reached the threshold values of judgement；When each phase voltage situation has reached the threshold values of judgement and non-equilibrium among three phase voltages have reached the threshold values of judgement, which is denoted as Voltage unbalance；The number of Voltage unbalance in the time span is counted, then divided by the data break sum in the time span, obtains the duration accounting of Voltage unbalance, if the duration accounting is greater than decision threshold, which is judged as Voltage unbalance.
Description
Technical field
The present invention relates to field of power systems, more particularly, to a kind of Allocation transformer based on metering centralized meter reading terminal data
Press uneven judgment method.
Background technique
The intelligent centralized meter reading terminal of metering automation system has been realized substantially acquires three distant data of distribution transformer, former
In reason can the balance movement situation to the three-phase voltage of distribution transformer analyze.But currently based on metering centralized meter reading terminal
The example that data analyze the operating status of distribution transformer three-phase voltage is few, and reason mainly has following:
1) the case where sending data to rely on wireless network in terminal, loss of data had due to signal problem.
2) terminal itself quality problems cause to lack data or data inaccuracy.
3) data memory gap is not short enough, and most of only 15 minutes finenesses cannot achieve real time monitoring.
Summary of the invention
The present invention provides a kind of power distribution voltage imbalance judgment method based on metering centralized meter reading terminal data, and this method is to matching
The three-phase voltage situation of piezoelectric transformer is assessed, and judges its unbalanced state and degree.
In order to reach above-mentioned technical effect, technical scheme is as follows:
A kind of power distribution voltage imbalance judgment method based on metering centralized meter reading terminal data, comprising the following steps:
S1: calculating the non-equilibrium among three phase voltages S of every 15 minutes of distribution transforming, and calculation formula is as follows:
S2: judging whether every 15 minutes S are greater than threshold values Ss, if more than then judging that the distribution transforming threephase load in 15 minutes is uneven
Weighing apparatus, otherwise it is assumed that its imbalance of three-phase voltage；
S3: judging whether every 15 minutes each phase voltages are greater than Us, and any phase voltage is greater than Us, that is, step S2 judgement, otherwise
Think this 15 minutes distribution transforming three-phase voltage balances；
S4: counting the Sc in this month, by formula:
Computational load three-phase imbalance time accounting T；
S5: judging whether T is greater than Ts, if more than this month Voltage unbalance of the distribution transforming then being judged, otherwise it is assumed that the distribution transforming
This month balance of voltage；
Wherein, Us is the active threshold values of individual event, and Ss is degree of unbalancedness threshold values, and Ts is duration accounting threshold values, and T is duration accounting,
Sc is uneven number, and St is 15 minutes numbers in statistical time length.
Compared with prior art, the beneficial effect of technical solution of the present invention is:
It is every that the method for the present invention calculates the distribution transforming in certain time length, according to the calculation method of non-equilibrium among three phase voltages
The non-equilibrium among three phase voltages of one data break；Judge whether each phase voltage situation of each data break has reached judgement
Threshold values；When each phase voltage situation has reached the threshold values of judgement, whether the non-equilibrium among three phase voltages of each data break are judged
Reach the threshold values of judgement；When each phase voltage situation has reached the threshold values of judgement and non-equilibrium among three phase voltages have reached the valve of judgement
When value, which is denoted as Voltage unbalance；The number of Voltage unbalance in the time span is counted, then divided by the time
Data break sum in length, obtains the duration accounting of Voltage unbalance, if the duration accounting is greater than decision threshold, by this
Distribution transforming is judged as Voltage unbalance.This method can utilize the data of the general measuring terminal of quality；Using the number of regular period
According to the interference of data fluctuations can be removed from；Using the data of long-term, it can be derived that statistical law, depth do not engraved when single
Study carefully accuracy.
Detailed description of the invention
Fig. 1 is the method for the present invention flow chart.
Specific embodiment
The attached figures are only used for illustrative purposes and cannot be understood as limitating the patent；
In order to better illustrate this embodiment, the certain components of attached drawing have omission, zoom in or out, and do not represent actual product
Size；
To those skilled in the art, it is to be understood that certain known features and its explanation, which may be omitted, in attached drawing
's.
The following further describes the technical solution of the present invention with reference to the accompanying drawings and examples.
Embodiment 1
As shown in Figure 1, a kind of power distribution voltage imbalance judgment method based on metering centralized meter reading terminal data, including following step
It is rapid:
S1: calculating the non-equilibrium among three phase voltages S of every 15 minutes of distribution transforming, and calculation formula is as follows:
S2: judging whether every 15 minutes S are greater than threshold values Ss, if more than then judging that the distribution transforming threephase load in 15 minutes is uneven
Weighing apparatus, otherwise it is assumed that its imbalance of three-phase voltage；
S3: judging whether every 15 minutes each phase voltages are greater than Us, and any phase voltage is greater than Us, that is, step S2 judgement, otherwise
Think this 15 minutes distribution transforming three-phase voltage balances；
S4: counting the Sc in this month, by formula:
Computational load three-phase imbalance time accounting T；
S5: judging whether T is greater than Ts, if more than this month Voltage unbalance of the distribution transforming then being judged, otherwise it is assumed that the distribution transforming
This month balance of voltage；
Wherein, Us is the active threshold values of individual event, and Ss is degree of unbalancedness threshold values, and Ts is duration accounting threshold values, and T is duration accounting,
Sc is uneven number, and St is 15 minutes numbers in statistical time length.
This method in certain time length, according to the calculation method of non-equilibrium among three phase voltages calculate the distribution transforming each
The non-equilibrium among three phase voltages of data break；Judge whether each phase voltage situation of each data break has reached the valve of judgement
Value；Under conditions of meeting project 2, judge whether the non-equilibrium among three phase voltages of each data break have reached the valve of judgement
Value；If the data break meets the condition of project 2 and project 3 simultaneously, which is denoted as Voltage unbalance；Statistics should
The number of Voltage unbalance in time span, then divided by the data break sum in the time span, obtain Voltage unbalance
The distribution transforming is judged as Voltage unbalance if the duration accounting is greater than decision threshold by duration accounting.This method can utilize matter
Measure the data of general measuring terminal；Using the data of regular period, the interference of data fluctuations can be removed from；Using long-term
Data can be derived that statistical law, not engrave when single and go into seriously accuracy.
The same or similar label correspond to the same or similar components；
Described in attached drawing positional relationship for only for illustration, should not be understood as the limitation to this patent；
Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair
The restriction of embodiments of the present invention.For those of ordinary skill in the art, may be used also on the basis of the above description
To make other variations or changes in different ways.There is no necessity and possibility to exhaust all the enbodiments.It is all this
Made any modifications, equivalent replacements, and improvements etc., should be included in the claims in the present invention within the spirit and principle of invention
Protection scope within.
Claims (1)
1. a kind of power distribution voltage imbalance judgment method based on metering centralized meter reading terminal data, which is characterized in that including following step
It is rapid:
S1: calculating the non-equilibrium among three phase voltages S of every 15 minutes of distribution transforming, and calculation formula is as follows:
S2: judging whether every 15 minutes S are greater than threshold values Ss, if more than then judging that the distribution transforming threephase load in 15 minutes is uneven,
Otherwise it is assumed that its imbalance of three-phase voltage；
S3: judging whether every 15 minutes each phase voltages are greater than Us, and any phase voltage is greater than Us, that is, step S2 judgement, otherwise it is assumed that
This 15 minutes distribution transforming three-phase voltage balances；
S4: counting the Sc in this month, by formula:
Computational load three-phase imbalance time accounting T；
S5: judging whether T is greater than Ts, if more than, then judge this month Voltage unbalance of the distribution transforming, otherwise it is assumed that the distribution transforming this
Month balance of voltage；
Wherein, Us is the active threshold values of individual event, and Ss is degree of unbalancedness threshold values, and Ts is duration accounting threshold values, and T is duration accounting, and Sc is
Uneven number, St are 15 minutes numbers in statistical time length.
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| CN201710425640.0A CN109001547A (en) | 2017-06-07 | 2017-06-07 | A kind of power distribution voltage imbalance judgment method based on metering centralized meter reading terminal data |
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| CN201710425640.0A CN109001547A (en) | 2017-06-07 | 2017-06-07 | A kind of power distribution voltage imbalance judgment method based on metering centralized meter reading terminal data |
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Application publication date: 20181214 |