CN112415287A - Method and system for identifying transformation ratio replacement of metering current transformer - Google Patents
Method and system for identifying transformation ratio replacement of metering current transformer Download PDFInfo
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- CN112415287A CN112415287A CN202011279130.5A CN202011279130A CN112415287A CN 112415287 A CN112415287 A CN 112415287A CN 202011279130 A CN202011279130 A CN 202011279130A CN 112415287 A CN112415287 A CN 112415287A
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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
- G01R29/20—Measuring number of turns; Measuring transformation ratio or coupling factor of windings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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Abstract
The application discloses a method and a system for identifying the change of the transformation ratio of a metering current transformer. Wherein, the method comprises the following steps: measuring the current impedance of a secondary circuit of the metering current transformer in real time by using a circuit impedance measuring unit, and judging whether a state identification unit has a fault or not; under the condition that the state identification unit has no fault, reading the initial impedance of the secondary circuit and the current impedance of the secondary circuit through the circuit impedance measurement unit; and identifying a change in the transformation ratio of the metering current transformer in the event that the present impedance of the secondary circuit is greater than the impedance infinitesimal threshold and less than the impedance infinitesimal threshold, and the present impedance of the secondary circuit is not equal to the initial impedance of the secondary circuit.
Description
Technical Field
The present application relates to the field of power system technologies, and in particular, to a method and a system for determining a transformation ratio state of a current transformer.
Background
The line loss rate of power grids in various regions of China is not optimistic, the management strength of national grid companies on line loss is strengthened year by year, and among a plurality of factors influencing the line loss, the change of the transformation ratio of the metering current transformer is an important reason of the line loss, so that huge economic loss is caused to power supply enterprises and countries.
In the metering loop on-line detection system, the monitoring of the electric energy meter is completed in full coverage, and the monitoring of the secondary loop and the mutual inductor is gradually popularized at present. The most extensive detection devices of the mutual inductor and the secondary circuit are loop state inspection instruments released by national network companies, and can effectively identify the abnormal states of normal connection of a current transformer loop of the secondary circuit, open circuit of the current transformer secondary circuit, current transformer secondary terminal shunt, current transformer primary shunt, current transformer loop series connection rectifying equipment, current transformer transformation ratio replacement, magnetic field abnormality and the like, but cannot effectively identify the transformation ratio replacement of the metering current transformer.
The transformation ratio of the metering current transformer is changed illegally, the accuracy of electric energy metering is seriously influenced, the electric energy is charged less, economic loss is caused to state network companies, personal safety can be seriously damaged, and the safe operation of a power grid is influenced. At present, no effective identification method exists for the transformation ratio replacement of the metering current transformer.
Disclosure of Invention
The embodiment of the disclosure provides a method and a system for identifying the change of the transformation ratio of a metering current transformer, which at least solve the problems that the illegal change of the transformation ratio of the metering current transformer in the prior art seriously affects the accuracy of electric energy metering, causes less electric energy charging, causes economic loss to state network companies, seriously possibly damages personal safety and affects the safe operation of a power grid. At present, no effective identification method for the transformation ratio replacement of the metering current transformer exists.
According to an aspect of the embodiments of the present disclosure, there is provided a method of identifying a transformation ratio replacement of a metering current transformer, including: measuring the current impedance of a secondary circuit of the metering current transformer in real time by using a circuit impedance measuring unit, and judging whether a state identification unit has a fault or not; under the condition that the state identification unit has no fault, reading the initial impedance of the secondary circuit and the current impedance of the secondary circuit through the circuit impedance measurement unit; and identifying a change in the transformation ratio of the metering current transformer in the event that the present impedance of the secondary circuit is greater than the impedance infinitesimal threshold and less than the impedance infinitesimal threshold, and the present impedance of the secondary circuit is not equal to the initial impedance of the secondary circuit.
According to another aspect of the embodiments of the present disclosure, there is also provided a system for identifying a transformation ratio replacement of a metering current transformer, including: the measuring module is used for measuring the current impedance of a secondary circuit of the metering current transformer in real time by using the circuit impedance measuring unit and judging whether the state identifying unit has a fault or not; the reading module is used for reading the initial impedance of the secondary circuit and the current impedance of the secondary circuit through the circuit impedance measuring unit under the condition that the state identifying unit does not have faults; and the determining module is used for identifying the transformation ratio replacement of the metering current transformer under the condition that the current impedance of the secondary circuit is greater than an impedance infinitesimal threshold value and smaller than an impedance infinitesimal threshold value and is not equal to the initial impedance of the secondary circuit.
In the invention, when the metering current transformer is changed, the current impedance of the secondary circuit is changed; when a secondary circuit of the metering current transformer is short-circuited, the current impedance of the secondary circuit approaches infinitesimal small; when the secondary circuit of the current transformer is open, the current impedance of the secondary circuit approaches infinity. Therefore, the change state of the transformation ratio of the current transformer can be accurately identified, data support can be provided for reducing the line loss of the power grid, upgrading and transforming the smart power grid, intelligently using power, overhauling equipment and the like, and safe and stable operation and driving protection navigation of a metering loop of the power distribution network are achieved. Furthermore, the problems that the metering current transformer ratio is changed illegally, the accuracy of electric energy metering is seriously influenced, the electric energy is charged less, economic loss is caused to state network companies, personal safety is seriously possibly damaged, and the safe operation of a power grid is influenced in the prior art are solved. At present, no effective identification method for the transformation ratio replacement of the metering current transformer exists.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the disclosure and together with the description serve to explain the disclosure and not to limit the disclosure. In the drawings:
FIG. 1 is a schematic flow chart diagram of a method of identifying a ratiometric change of a metering current transformer in accordance with an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of an apparatus for identifying a change-ratio change of a metering current transformer according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of a secondary circuit equivalent circuit of a metering current transformer according to an embodiment of the present disclosure; and
fig. 4 is a schematic diagram of a system for identifying a ratio change of a metering current transformer according to an embodiment of the present disclosure.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
According to a first aspect of the present embodiment, a method of identifying a ratio change of a metering current transformer is provided. Fig. 1 shows a schematic flow diagram of the method, which, with reference to fig. 1, comprises:
s102: measuring the current impedance of a secondary circuit of the metering current transformer in real time by using a circuit impedance measuring unit, and judging whether a state identification unit has a fault or not;
s104: under the condition that the state identification unit has no fault, reading the initial impedance of the secondary circuit and the current impedance of the secondary circuit through the circuit impedance measurement unit; and
s106: identifying a ratio change of the metering current transformer in the event that a present impedance of the secondary circuit is greater than an impedance infinitesimal threshold and less than an impedance infinitesimal threshold, and the present impedance of the secondary circuit is not equal to an initial impedance of the secondary circuit.
In particular, reference is made to the device for identifying the ratio change of a metering current transformer in fig. 2. The device consists of a loop impedance measuring unit and a state identification unit. The loop impedance measuring unit is electromagnetically coupled with a secondary loop of the metering current transformer, so that the impedance of the secondary loop can be measured on line; and the state identification unit identifies whether the current transformer is subjected to transformation ratio replacement or not according to the impedance value of the secondary loop.
Step 1: starting a loop impedance measuring unit to circularly measure and meter the secondary loop impedance task of the current transformer;
step 2: judging whether the state recognition unit is newly installed (the state recognition unit has no fault and the state recognition unit is newly installed), if so, entering the step 3, otherwise, entering the step 4;
and step 3: the initial impedance of the secondary loop is read from the loop impedance measurement unit and recorded as ZS', permanently storing, go to step 4;
and 4, step 4: reading the current impedance of the secondary loop from the loop impedance measurement unit, recorded as ZSProceed to step 5.
And 5: setting the threshold value of infinite resistance as ZdThe infinite impedance threshold is ZuIf Z isd＜ZS＜ZuAnd Z isS≠ZSIf not, judging that the current transformer is not subjected to transformation ratio replacement. Step 4 is entered.
Therefore, the current transformer transformation ratio replacement state can be accurately identified, data support can be provided for reducing the line loss of the power grid, upgrading and transforming the smart power grid, intelligently using power, overhauling equipment and the like, and safe and stable operation and driving protection navigation are realized for a metering loop of the power distribution network. Furthermore, the problems that the metering current transformer ratio is changed illegally, the accuracy of electric energy metering is seriously influenced, the electric energy is charged less, economic loss is caused to state network companies, personal safety is seriously possibly damaged, and the safe operation of a power grid is influenced in the prior art are solved. At present, no effective identification method for the transformation ratio replacement of the metering current transformer exists.
Optionally, the method further comprises: and under the condition that the current impedance of the secondary circuit is smaller than an impedance infinitesimal threshold or larger than an impedance infinitesimal threshold, returning to the step of measuring the current impedance of the secondary circuit of the metering current transformer in real time by using the circuit impedance measuring unit.
In particular, the current impedance Z at the secondary loopSLess than an impedance infinitesimal threshold value ZdOr the current impedance Z of the secondary loopSGreater than an impedance infinite threshold ZuIn the case of (3), the step of measuring the current impedance of the secondary loop of the metering current transformer in real time by using the loop impedance measuring unit is returned, that is, the step 4 is returned.
Optionally, the measuring, in real time, the current impedance of the secondary loop of the metering current transformer by using the loop impedance measuring unit includes: determining secondary excitation impedance of the metering current transformer, secondary loop direct-current resistance of the metering current transformer, input impedance of an electric energy meter and secondary leakage reactance of the metering current transformer; and determining the current impedance of the secondary circuit according to the secondary excitation impedance of the metering current transformer, the direct-current resistance of the secondary circuit of the metering current transformer, the input impedance of the electric energy meter and the secondary leakage reactance of the metering current transformer.
Referring to fig. 3, the secondary circuit of the metering current transformer is composed of the metering current transformer, a secondary circuit wire and an electric energy metering device. In the embodiment, the change of the transformation ratio of the metering current transformer is identified through the detection device. The detection device is connected in series in a secondary circuit of a current transformer, and fig. 3 shows an equivalent circuit of the secondary circuit of the current transformer. Determining secondary excitation impedance of the metering current transformer, secondary loop direct-current resistance of the metering current transformer, input impedance of an electric energy meter and secondary leakage reactance of the metering current transformer; and determining the current impedance of the secondary circuit according to the secondary excitation impedance of the metering current transformer, the direct-current resistance of the secondary circuit of the metering current transformer, the input impedance of the electric energy meter and the secondary leakage reactance of the metering current transformer.
Thus, when the metering current transformer is changed, the current impedance Z of the secondary circuitSWill change; when the secondary circuit of the metering current transformer is short-circuited, the current impedance Z of the secondary circuitSApproaching infinity; when the secondary circuit of the current transformer is open, the current impedance Z of the secondary circuitSApproaching infinity.
Optionally, determining the current impedance of the secondary circuit according to the secondary excitation impedance of the metering current transformer, the secondary circuit direct current resistance of the metering current transformer, the input impedance of the electric energy meter, and the secondary leakage reactance of the metering current transformer, includes: the calculation formula for determining the current impedance of the secondary loop is as follows:
wherein Z isSIs the current impedance of the secondary loop, k is a constant, USFor measuring high-frequency voltage signals applied in the secondary circuit of a current transformer, ISFor detecting the resulting current signal in the secondary loop, ZmFor measuring secondary excitation impedance, Z, of current transformers2For measuring the DC resistance, Z, of the secondary circuit of a current transformerLIs the input impedance of an electric energy meter, ZxThe secondary leakage reactance of the current transformer is measured.
Optionally, determining a secondary excitation impedance of the metering current transformer comprises: determining the secondary excitation impedance Z according to the following formulam，
Wherein mu is magnetic conductivity, f is frequency, N is secondary turns, S is core sectional area, k is core lamination coefficient, and l is core magnetic circuit perimeter.
Thus, when the metering current transformer is changed, the current impedance Z of the secondary circuitSWill change; when the secondary circuit of the metering current transformer is short-circuited, the current impedance Z of the secondary circuitSApproaching infinity; when the secondary circuit of the current transformer is open, the current of the secondary circuitImpedance ZSApproaching infinity. Therefore, the change state of the transformation ratio of the current transformer can be accurately identified, data support can be provided for reducing the line loss of the power grid, upgrading and transforming the smart power grid, intelligently using power, overhauling equipment and the like, and safe and stable operation and driving protection navigation of a metering loop of the power distribution network are achieved. Furthermore, the problems that the metering current transformer ratio is changed illegally, the accuracy of electric energy metering is seriously influenced, the electric energy is charged less, economic loss is caused to state network companies, personal safety is seriously possibly damaged, and the safe operation of a power grid is influenced in the prior art are solved. At present, no effective identification method for the transformation ratio replacement of the metering current transformer exists.
In accordance with another aspect of the present embodiment, a system 400 for identifying a ratio change of a metering current transformer is provided. The system 400, among other things, includes: the measuring module 410 is used for measuring the current impedance of the secondary loop of the metering current transformer in real time by using the loop impedance measuring unit and judging whether the state identifying unit has a fault or not; a reading module 420, configured to read, by the loop impedance measuring unit, an initial impedance of the secondary loop and a current impedance of the secondary loop when the state identifying unit has no fault; and a determination module 430 for identifying a change-ratio replacement of the metering current transformer if the present impedance of the secondary loop is greater than the impedance infinitesimal threshold and less than the impedance infinitesimal threshold, and the present impedance of the secondary loop is not equal to the initial impedance of the secondary loop.
Optionally, the system 400 further includes: and the return module is used for returning to the step of measuring the current impedance of the secondary circuit of the metering current transformer in real time by using the circuit impedance measuring unit under the condition that the current impedance of the secondary circuit is smaller than the impedance infinitesimal threshold or the current impedance of the secondary circuit is larger than the impedance infinitesimal threshold.
Optionally, the measurement module 410 includes: the first determining submodule is used for determining the secondary excitation impedance of the metering current transformer, the direct-current resistance of a secondary loop of the metering current transformer, the input impedance of the electric energy meter and the secondary leakage reactance of the metering current transformer; and the second determining submodule is used for determining the current impedance of the secondary circuit according to the secondary excitation impedance of the metering current transformer, the direct-current resistance of the secondary circuit of the metering current transformer, the input impedance of the electric energy meter and the secondary leakage reactance of the metering current transformer.
Optionally, the second determining sub-module includes: determining a secondary loop impedance calculation formula unit, wherein a calculation formula for determining the current impedance of the secondary loop is as follows:
wherein Z isSIs the current impedance of the secondary loop, k is a constant, USFor measuring high-frequency voltage signals applied in the secondary circuit of a current transformer, ISFor detecting the resulting current signal in the secondary loop, ZmFor measuring secondary excitation impedance, Z, of current transformers2For measuring the DC resistance, Z, of the secondary circuit of a current transformerLIs the input impedance of an electric energy meter, ZxThe secondary leakage reactance of the current transformer is measured.
Optionally, the first determining sub-module includes: a field impedance determining unit for determining a secondary field impedance Z according to the following formulam，
Wherein mu is magnetic conductivity, f is frequency, N is secondary turns, S is core sectional area, k is core lamination coefficient, and l is core magnetic circuit perimeter.
The system 400 for determining the transformation ratio state of the current transformer according to the embodiment of the present invention corresponds to a method for determining the transformation ratio state of the current transformer according to another embodiment of the present invention, and is not described herein again.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein. The scheme in the embodiment of the application can be implemented by adopting various computer languages, such as object-oriented programming language Java and transliterated scripting language JavaScript.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (10)
1. A method of identifying a change in transformation ratio of a metering current transformer, comprising:
measuring the current impedance of a secondary circuit of the metering current transformer in real time by using a circuit impedance measuring unit, and judging whether a state identification unit has a fault or not;
under the condition that the state identification unit has no fault, reading the initial impedance of the secondary circuit and the current impedance of the secondary circuit through a circuit impedance measurement unit; and
identifying a transformation ratio replacement of a metering current transformer in the event that a present impedance of the secondary loop is greater than an impedance infinitesimal threshold and less than an impedance infinitesimal threshold, and the present impedance of the secondary loop is not equal to an initial impedance of the secondary loop.
2. The method of claim 1, further comprising:
and under the condition that the current impedance of the secondary circuit is smaller than an impedance infinitesimal threshold value or larger than an impedance infinitesimal threshold value, returning to the step of measuring the current impedance of the secondary circuit of the metering current transformer in real time by using a circuit impedance measuring unit.
3. The method of claim 1, wherein measuring the present impedance of the secondary loop of the metering current transformer in real time using a loop impedance measurement unit comprises:
determining secondary excitation impedance of the metering current transformer, secondary loop direct-current resistance of the metering current transformer, input impedance of an electric energy meter and secondary leakage reactance of the metering current transformer; and
and determining the current impedance of a secondary circuit according to the secondary excitation impedance of the metering current transformer, the direct-current resistance of the secondary circuit of the metering current transformer, the input impedance of the electric energy meter and the secondary leakage reactance of the metering current transformer.
4. The method of claim 3, wherein determining a present impedance of a secondary loop based on a secondary excitation impedance of the metering current transformer, a secondary loop DC resistance of the metering current transformer, a power meter input impedance, and a secondary leakage reactance of the metering current transformer comprises:
the calculation formula for determining the current impedance of the secondary loop is as follows:
wherein Z isSIs the current impedance of the secondary loop, k is a constant, USFor measuring high-frequency voltage signals applied in the secondary circuit of a current transformer, ISFor detecting the resulting current signal in the secondary loop, ZmFor measuring secondary excitation impedance, Z, of current transformers2For measuring the DC resistance, Z, of the secondary circuit of a current transformerLIs the input impedance of an electric energy meter, ZxThe secondary leakage reactance of the current transformer is measured.
5. The method of claim 3, wherein determining a secondary excitation impedance of the metering current transformer comprises:
determining the secondary excitation impedance Z according to the following formulam
Wherein mu is magnetic conductivity, f is frequency, N is secondary turns, S is core sectional area, k is core lamination coefficient, and l is core magnetic circuit perimeter.
6. A system for identifying a ratio change of a metering current transformer, comprising:
the measuring module is used for measuring the current impedance of a secondary circuit of the metering current transformer in real time by using the circuit impedance measuring unit and judging whether the state identifying unit has a fault or not;
the reading module is used for reading the initial impedance of the secondary circuit and the current impedance of the secondary circuit through the circuit impedance measuring unit under the condition that the state identifying unit does not have faults; and
a determination module to identify a transformation ratio replacement of a metering current transformer if a present impedance of the secondary loop is greater than an impedance infinitesimal threshold and less than an impedance infinitesimal threshold, and the present impedance of the secondary loop is not equal to an initial impedance of the secondary loop.
7. The system of claim 6, further comprising:
and the return module is used for returning to the step of measuring the current impedance of the secondary loop of the metering current transformer in real time by using the loop impedance measuring unit under the condition that the current impedance of the secondary loop is smaller than an impedance infinitesimal threshold or the current impedance of the secondary loop is larger than an impedance infinitesimal threshold.
8. The system of claim 6, wherein the measurement module comprises:
the first determining submodule is used for determining the secondary excitation impedance of the metering current transformer, the direct-current resistance of a secondary loop of the metering current transformer, the input impedance of an electric energy meter and the secondary leakage reactance of the metering current transformer; and
and the second determining submodule is used for determining the current impedance of a secondary circuit according to the secondary excitation impedance of the metering current transformer, the direct-current resistance of the secondary circuit of the metering current transformer, the input impedance of the electric energy meter and the secondary leakage reactance of the metering current transformer.
9. The system of claim 8, wherein the second determining submodule comprises:
determining a secondary loop impedance calculation formula unit, wherein a calculation formula for determining the current impedance of the secondary loop is as follows:
wherein Z isSIs the current impedance of the secondary loop, k is a constant, USFor measuring high-frequency voltage signals applied in the secondary circuit of a current transformer, ISFor detecting the resulting current signal in the secondary loop, ZmFor measuring secondary excitation impedance, Z, of current transformers2For measuring the DC resistance, Z, of the secondary circuit of a current transformerLIs the input impedance of an electric energy meter, ZxThe secondary leakage reactance of the current transformer is measured.
10. The system of claim 8, wherein the first determining submodule comprises:
a field impedance determination unit for determining the secondary field impedance Z according to the following formulam
Wherein mu is magnetic conductivity, f is frequency, N is secondary turns, S is core sectional area, k is core lamination coefficient, and l is core magnetic circuit perimeter.
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