CN115236554A - Detection method and device for polarity reversal connection of voltage transformer and computer equipment - Google Patents
Detection method and device for polarity reversal connection of voltage transformer and computer equipment Download PDFInfo
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Abstract
The invention discloses a method and a device for detecting polarity reversal of a voltage transformer and computer equipment, relates to the field of electric energy, and mainly aims to improve the detection efficiency and the detection accuracy of the polarity reversal of the voltage transformer. The method comprises the following steps: acquiring a first total power factor displayed by the electric energy meter in the working process, a power factor and a voltage corresponding to each element, and a load power factor angle; subtracting the rated voltage from each voltage to obtain each voltage difference, and judging whether each voltage difference is smaller than a preset voltage difference or not; if the voltage difference is smaller than the preset voltage difference, determining a target power factor interval corresponding to each element when the voltage transformer is correctly wired based on the load power factor angle; and judging whether the polarity of the voltage transformer is reversely connected or not based on the first total power factor, the power factor corresponding to each element and the target power factor interval. The invention is suitable for detecting the polarity reversal of the voltage transformer.
Description
Technical Field
The invention relates to the field of electric energy, in particular to a method and a device for detecting polarity reversal of a voltage transformer and computer equipment.
Background
Along with the rapid development of Chinese economy, the demand of various industries on electricity is increasingly large, the phenomenon of unbalanced electricity consumption at different times is increasingly serious, in order to improve the electricity utilization efficiency and reasonably utilize electricity resources, an intelligent electric energy meter is provided, the electricity consumption of users is counted and charged, meanwhile, in order to ensure that the electric energy meter can safely and accurately measure the electric energy, a voltage transformer needs to be connected on the electric energy meter, however, if the voltage transformer has reverse polarity, wrong electric energy data can be displayed on the electric energy meter, and therefore, whether the voltage transformer has reverse polarity or not is judged to become an urgent problem to be solved.
Currently, a testing instrument is usually used to measure relevant data at an electric energy meter terminal box to determine whether polarity reversal exists in a voltage transformer. However, in this determination method, a worker needs to install the phase voltammetry meters, the electricity utilization inspection tester, the pincerlike multimeter and other testing instruments on the electric energy meter through wiring operation, and determines whether the polarity of the voltage transformer is reversed through data measured by various measuring instruments, so that the detection efficiency of the polarity reversal of the voltage transformer is reduced.
Disclosure of Invention
The invention provides a method and a device for detecting polarity reversal of a voltage transformer and computer equipment, and mainly aims to improve the detection efficiency and the detection accuracy of the polarity reversal of the voltage transformer.
According to a first aspect of the present invention, there is provided a method for detecting polarity reversal of a voltage transformer, comprising:
acquiring a first total power factor displayed by an electric energy meter connected with a voltage transformer in the working process, power factors and voltages corresponding to all elements, and a load power factor angle of a circuit measured by the electric energy meter;
subtracting the rated voltage from the voltage corresponding to each element to obtain a voltage difference corresponding to each element, and judging whether each voltage difference is smaller than a preset voltage difference;
if the voltage differences are smaller than the preset voltage difference, determining a target power factor interval corresponding to each element when the voltage transformer is correctly connected based on the load power factor angle;
judging whether the power factor corresponding to each element is in the corresponding target power factor interval;
and if the power factors corresponding to the elements are all in the corresponding target power factor intervals, judging whether the polarity of the voltage transformer is reversely connected or not based on the first total power factor and the power factors corresponding to the elements.
According to a second aspect of the present invention, there is provided a detection apparatus for detecting polarity reversal of a voltage transformer, comprising:
the acquisition unit is used for acquiring a first total power factor displayed by the electric energy meter connected with the voltage transformer in the working process, power factors and voltages corresponding to all elements and a load power factor angle of a circuit measured by the electric energy meter;
the subtracting unit is used for subtracting the rated voltage from the voltage corresponding to each element to obtain the voltage difference corresponding to each element, and judging whether each voltage difference is smaller than the preset voltage difference;
the determining unit is used for determining a target power factor interval corresponding to each element when the voltage transformer is correctly connected based on the load power factor angle if each voltage difference is smaller than the preset voltage difference;
the first judging unit is used for judging whether the power factor corresponding to each element is in the corresponding target power factor interval;
and the second judging unit is used for judging whether the polarity of the voltage transformer is reversely connected or not based on the first total power factor and the power factors corresponding to the elements if the power factors corresponding to the elements are in the corresponding target power factor intervals.
According to a third aspect of the present invention, there is provided a computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of:
acquiring a first total power factor displayed by an electric energy meter connected with a voltage transformer in the working process, power factors and voltages corresponding to all elements, and a load power factor angle of a circuit measured by the electric energy meter;
subtracting the rated voltage from the voltage corresponding to each element to obtain a voltage difference corresponding to each element, and judging whether each voltage difference is smaller than a preset voltage difference;
if the voltage differences are smaller than the preset voltage difference, determining a target power factor interval corresponding to each element when the voltage transformer is correctly connected based on the load power factor angle;
judging whether the power factor corresponding to each element is in the corresponding target power factor interval;
and if the power factors corresponding to the elements are all in the corresponding target power factor intervals, judging whether the polarity of the voltage transformer is reversely connected or not based on the first total power factor and the power factors corresponding to the elements.
According to a fourth aspect of the present invention, there is provided a computer apparatus comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the following steps when executing the program:
acquiring a first total power factor displayed by an electric energy meter connected with a voltage transformer in the working process, power factors and voltages corresponding to all elements, and a load power factor angle of a circuit measured by the electric energy meter;
subtracting the rated voltage from the voltage corresponding to each element to obtain a voltage difference corresponding to each element, and judging whether each voltage difference is smaller than a preset voltage difference;
if the voltage differences are smaller than the preset voltage difference, determining a target power factor interval corresponding to each element when the voltage transformer is correctly connected based on the load power factor angle;
judging whether the power factor corresponding to each element is in the corresponding target power factor interval;
and if the power factors corresponding to the elements are all in the corresponding target power factor intervals, judging whether the polarity of the voltage transformer is in reverse connection or not based on the first total power factor and the power factors corresponding to the elements.
According to the detection method, the detection device and the computer equipment for the polarity reversal of the voltage transformer, compared with the mode that whether the voltage transformer has the polarity reversal is judged by measuring related data at an electric energy meter terminal box by using a test instrument at present, the method obtains a first total power factor displayed by the electric energy meter connected with the voltage transformer in the working process, power factors and voltages corresponding to all elements and a load power factor angle of a circuit measured by the electric energy meter; subtracting the rated voltage from the voltage corresponding to each element to obtain a voltage difference corresponding to each element, and judging whether each voltage difference is smaller than a preset voltage difference; if the voltage differences are smaller than the preset voltage difference, determining a target power factor interval corresponding to each element when the voltage transformer is correctly connected based on the load power factor angle; judging whether the power factor corresponding to each element is in the corresponding target power factor interval; if the power factors corresponding to the elements are all in the corresponding target power factor intervals, whether the polarity of the voltage transformer is reversely connected is judged based on the first total power factor and the power factors corresponding to the elements, so that whether the first total power factor, the power factor and the voltage corresponding to the elements and the load power factor angle of the circuit are displayed in the working process of the electric energy meter connected with the voltage transformer is judged, whether the voltage difference between the voltage and the rated voltage is smaller than a preset voltage difference and smaller than the preset voltage difference is judged, the target power factor interval corresponding to the elements is required to be determined, whether the power factor corresponding to the elements is in the corresponding target power factor interval is judged, if the power factor corresponding to the elements is in the corresponding power factor interval, whether the polarity of the voltage transformer is reversely connected is judged based on the power factor corresponding to the elements and the first total power factor, the detection efficiency of the polarity reverse connection of the voltage transformer is improved, and meanwhile, the detection accuracy of the reverse connection of the voltage transformer caused by wrong instrument installation is improved due to the fact that technical levels of workers are different.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 shows a flowchart of a detection method for detecting polarity reversal of a voltage transformer according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating another method for detecting polarity reversal of a voltage transformer according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram illustrating a detection apparatus for detecting polarity reversal of a voltage transformer according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another detection apparatus for detecting polarity reversal of a voltage transformer according to an embodiment of the present invention;
fig. 5 shows a physical structure diagram of a computer device according to an embodiment of the present invention.
Detailed Description
The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
At present, whether a voltage transformer has a mode of polarity reversal connection or not is judged by measuring related data at an electric energy meter terminal box by using a testing instrument, the detection efficiency of the polarity reversal connection of the voltage transformer is reduced, meanwhile, due to the fact that technical levels of workers are different, the testing instrument can be installed wrongly, wrong data are measured, and then the detection accuracy of the polarity reversal connection of the voltage transformer is low.
In order to solve the above problem, an embodiment of the present invention provides a method for detecting a polarity reversal of a voltage transformer, as shown in fig. 1, where the method includes:
101. the method comprises the steps of obtaining a first total power factor displayed by an electric energy meter connected with a voltage transformer in the working process, power factors and voltages corresponding to all elements and a load power factor angle of a circuit measured by the electric energy meter.
The electric energy meter can be a three-phase three-wire electric energy meter, the three-phase three-wire electric energy meter comprises two elements, and different circuits of the electric energy meter are different, and corresponding load power factor angles of the electric energy meter can also change.
For the embodiment of the invention, in order to solve the problems of low detection efficiency and low detection accuracy of the polarity reversal connection of the voltage transformer in the prior art, the embodiment of the invention acquires the first total power factor displayed by the electric energy meter connected with the voltage transformer in the working process, the power factor and the voltage corresponding to each element, and the load power factor angle of the circuit to be detected, and judges whether the voltage difference between each voltage and the rated voltage is smaller than the preset voltage difference and smaller than the preset voltage difference, a target power factor interval corresponding to each element is required to be determined, and simultaneously whether the power factor corresponding to each element is in the target power factor interval corresponding to each element is judged, if the power factor is in the power factor interval corresponding to each element, whether the voltage transformer is in the polarity reversal connection is judged based on the power factor corresponding to each element and the first total power factor, so that the detection efficiency of the polarity reversal connection of the voltage transformer is improved, and meanwhile, the situation that the test instrument is installed wrongly caused by the uneven technical level of workers is avoided, so that wrong data is measured, and the detection accuracy of the polarity reversal connection of the voltage transformer is improved. The embodiment of the invention is mainly applied to a scene of detecting the polarity reversal of the voltage transformer, and the execution main body of the embodiment of the invention is a device or equipment capable of detecting the polarity reversal of the voltage transformer, and can be specifically arranged at one side of a client or a server.
Specifically, the telephone transformer is connected to the three-phase three-wire electric energy meter, the three-phase three-wire electric energy meter is connected to an electric power system power generation network transmission line, a gateway connection line, a power supply line on each side of a transformer, a power consumer power supply line, a distribution transformer area and the like to operate in any one of the occasions, when the three-phase three-wire electric energy meter operates in any one of the occasions, a first total power factor is displayed on a display screen of the three-phase three-wire electric energy meter in real time, power factors corresponding to each element in the three-phase three-wire electric energy meter, and voltage and current corresponding to each element are displayed in a first quadrant and a third quadrant on the three-phase three-wire electric energy meter, when the three-phase three-wire electric energy meter operates in a capacitive load occasion, the power factors corresponding to each element in the three-phase three-wire electric energy meter, voltage and current corresponding to each element are displayed in a second quadrant and a fourth quadrant on the three-wire electric energy meter, when the polarity of the three-phase three-wire electric energy meter operates in a capacitive load occasion, the three-phase three-wire electric energy meter displays wrong power factors, and further, if the polarity electric energy meter is connected in a wrong polarity state, the polarity of a power consumption meter is judged, and the condition that the power consumption of a user is not necessary for a wrong power consumption for a power consumption meter is detected, and the user is judged, and the wrong power consumption of the user is caused by a wrong power meter, and the wrong power consumption meter is judged, and the wrong power meter is caused by the wrong power meter, and the wrong power consumption of the wrong power meter is detected, and the wrong power consumption of the wrong power meter is avoided, and the wrong power meter is detected.
102. And subtracting the rated voltage from the voltage corresponding to each element to obtain the voltage difference corresponding to each element, and judging whether each voltage difference is smaller than the preset voltage difference.
The rated voltage is 100V, and in the embodiment of the present invention, the voltage transformer is used for converting a high voltage into the rated voltage according to a proportional relationship, and the rated voltage is provided for metering devices such as a three-phase three-wire electric energy meter to work safely and accurately, so that, in order to determine whether the polarity of the voltage transformer is reversed, after obtaining each item of electric energy data in the three-phase three-wire electric energy meter, it is first required to subtract the rated voltage from the voltage corresponding to each element in each item of electric energy data, to obtain a voltage difference corresponding to each element, and determine whether the voltage difference is smaller than a preset voltage difference, it is required to specify the voltage difference according to requirements.
103. And if the voltage differences are smaller than the preset voltage difference, determining a target power factor interval corresponding to each element when the voltage transformer is correctly wired based on the load power factor angle.
For the embodiment of the invention, firstly, a load power factor angle of a circuit of the three-phase three-wire electric energy meter is taken, a power factor angle corresponding to each element in the three-phase three-wire electric energy meter is calculated by using the load power factor angle when the voltage transformer is correctly wired, a target power factor interval of the circuit of the three-phase three-wire electric energy meter is determined when the voltage transformer is correctly wired based on each power factor angle, for example, the load power factor angle of the circuit of the three-phase three-wire electric energy meter is taken to be 20 degrees, then the power factor angle corresponding to each element in the three-phase three-wire electric energy meter is calculated based on the 20 degrees and a preset angle of 30 degrees, the target power factor interval corresponding to each element when the voltage transformer is correctly wired is determined based on the target angle interval corresponding to each power factor angle, then whether the power factor corresponding to each element is in the target power factor interval corresponding to the element is judged, if the power factor corresponding to each element is in the target power factor interval corresponding to the element, whether the voltage transformer is connected in the target power factor interval corresponding to the element is judged based on the first total power factor and the power factor corresponding to each element, whether the voltage transformer is connected in the target power factor interval corresponding to the element is judged, thus whether the voltage transformer is connected in the reverse, the polarity of the voltage transformer is judged, and the polarity of the voltage transformer is not correctly, and the polarity of the voltage transformer is detected, and the polarity of the voltage transformer is not detected, thereby, and the voltage transformer is not the polarity of the voltage transformer, and the voltage transformer is detected, and the voltage transformer, and the polarity of the voltage transformer is not correctly.
104. And judging whether the power factor corresponding to each element is in the corresponding target power factor interval.
For the embodiment of the present invention, the power factor corresponding to each element is an important parameter for determining whether the polarity of the voltage transformer is reversed, and an incorrect power factor may be displayed in the three-phase three-wire electric energy meter, so as to determine whether the polarity of the voltage transformer is reversed, when it is determined that the voltage transformer is correctly connected, after the target power factor interval corresponding to each element in the three-phase three-wire electric energy meter, it is necessary to determine whether the power factor corresponding to each element displayed in the electric energy meter is within the target power factor interval corresponding to each element, for example, the power factor interval corresponding to the first element in each element determined according to the load power factor angle and the preset angle is 0.5-0.866, and the target power factor interval corresponding to the second element is 0.866-1, where the power factor corresponding to the first element displayed in the electric energy meter is 0.66, if the power factor corresponding to the second element is 0.97, determining that the power factor of the first element is between 0.5 and 0.866 of the target power factor interval corresponding to the first element, and the power factor of the second element is between 0.866 and 1 of the target power factor interval corresponding to the second element, and meanwhile, if the power factor is an inductive power factor, displaying the power factor in the first quadrant and the third quadrant, determining whether the absolute value of the power factor is within the target power factor interval, if the power factor is a capacitive power factor, displaying the power factor in the second quadrant and the fourth quadrant, determining whether the absolute value of the power factor is within the target power factor interval, and if the absolute value of each power factor is within the target power factor interval corresponding to the power factor, in order to further improve the detection accuracy of the polarity reversal of the voltage transformer, whether the voltage transformer is connected in a reverse polarity mode is judged based on the first total power factor and the power factors corresponding to the elements, so that the situation that a test instrument is installed wrongly due to the fact that technical levels of workers are different is avoided, wrong data are measured, and the detection accuracy of the voltage transformer in the reverse polarity mode is improved.
105. And if the power factors corresponding to the elements are all in the corresponding target power factor intervals, judging whether the polarity of the voltage transformer is in reverse connection or not based on the first total power factor and the power factors corresponding to the elements.
For the embodiment of the invention, if the power factors corresponding to each element in the electric energy meter are all within the range of the corresponding target power factor, the sum of the power factors corresponding to each element needs to be compared with the first total power factor, and whether the voltage transformer has a condition of polarity reversal is judged according to the comparison result, so that by obtaining the first total power factor displayed by the electric energy meter connected with the voltage transformer in the working process, the power factor and the voltage corresponding to each element, and the load power factor angle of the circuit, and judging whether the voltage difference between each voltage and the rated voltage is smaller than the preset voltage difference, and comparing the voltage difference with the small preset voltage difference, the target power factor interval corresponding to each element needs to be determined, and meanwhile, whether the power factor corresponding to each element is within the corresponding target power factor interval, if the voltage factor is within the corresponding power factor interval, finally judging whether the voltage transformer has polarity reversal based on the power factor corresponding to each element and the first total power factor, so that the detection efficiency of the polarity reversal of the voltage transformer is improved, and meanwhile, the technical level difference of workers is prevented from being staggered, and the condition of wrong polarity detection of the instrument is finally detected, and the wrong detection accuracy is improved.
According to the method for detecting the polarity reversal of the voltage transformer, compared with the mode that whether the polarity reversal exists in the voltage transformer is judged by measuring related data at an electric energy meter terminal box by using a testing instrument at present, the method obtains a first total power factor displayed by a three-phase three-wire electric energy meter connected with the voltage transformer in the working process, power factors and voltages corresponding to all components and a load power factor angle of a circuit detected by the three-phase three-wire electric energy meter; subtracting the rated voltage from the voltage corresponding to each element to obtain a voltage difference corresponding to each element, and judging whether each voltage difference is smaller than a preset voltage difference; if the voltage differences are smaller than the preset voltage difference, determining a target power factor interval corresponding to each element when the voltage transformer is correctly connected based on the load power factor angle; judging whether the power factor corresponding to each element is in the corresponding target power factor interval; if the power factors corresponding to the elements are all in the corresponding target power factor intervals, whether the polarity of the voltage transformer is reversely connected is judged based on the first total power factor and the power factors corresponding to the elements, so that whether the first total power factor, the power factor and the voltage corresponding to the elements and the load power factor angle of the circuit are displayed in the working process of the electric energy meter connected with the voltage transformer is judged, whether the voltage difference between the voltage and the rated voltage is smaller than a preset voltage difference and smaller than the preset voltage difference is judged, the target power factor interval corresponding to the elements is required to be determined, whether the power factor corresponding to the elements is in the corresponding target power factor interval is judged, if the power factor corresponding to the elements is in the corresponding power factor interval, whether the polarity of the voltage transformer is reversely connected is judged based on the power factor corresponding to the elements and the first total power factor, the detection efficiency of the polarity reverse connection of the voltage transformer is improved, and meanwhile, the detection accuracy of the reverse connection of the voltage transformer caused by wrong instrument installation is improved due to the fact that technical levels of workers are different.
Further, in order to better describe the above process of detecting the polarity reversal of the voltage transformer, as a refinement and an extension of the above embodiment, an embodiment of the present invention provides another method for detecting the polarity reversal of the voltage transformer, as shown in fig. 2, where the method includes:
201. the method comprises the steps of obtaining a first total power factor displayed by an electric energy meter connected with a voltage transformer in the working process, power factors and voltages corresponding to all elements and a load power factor angle of a circuit measured by the electric energy meter.
Specifically, the electric energy meter connected with the voltage transformer is called to display a first total power factor, a voltage, a current and a power factor corresponding to each element and a load power factor angle of a circuit measured by the electric energy meter on a screen in the working process, if the electric energy meter is a three-phase three-wire electric energy meter, the three-phase three-wire electric energy meter displays the first total power factor, a first voltage and a first power factor corresponding to the first element, a second voltage and a second power factor corresponding to the second element and the load power factor angle of the circuit measured by the three-phase three-wire electric energy meter on the screen in the working process, for example, the first total power factor displayed on the screen of the three-phase three-wire electric energy meter is 0.36, the first voltage corresponding to the first element is 175V, the first power factor is-0.17, the second voltage corresponding to the second element is 104V, the second power factor is 0.98, the inductive load power factor angle of the circuit of the three-phase three-wire electric energy meter is 20 degrees, in order to judge whether the polarity of a voltage transformer connected with the electric energy meter is reversely connected, all voltages and all power factors displayed in the three-phase three-wire electric energy meter need to be taken, the load power factor angle is determined according to the attribute of the circuit of the voltage meter, the voltage difference between each voltage and the rated voltage is determined, if the voltage difference is smaller than the preset voltage difference, when the wiring of the voltage transformer needs to be determined to be correct, the target power factor interval corresponding to each element in the electric energy meter is judged, whether the power factor of each element is in the target power factor interval corresponding to the element is judged, and if the voltage difference is in the target power factor interval, the power factor corresponding to each element is finally based on the first total power factor, and judging that the voltage transformer is in reverse polarity connection.
202. And subtracting the rated voltage from the voltage corresponding to each element to obtain a voltage difference corresponding to each element, and judging whether each voltage difference is smaller than a preset voltage difference.
For the embodiment of the present invention, in order to determine whether the voltage transformer has sufficient polarity reversal connection, it is first necessary to determine whether the voltage corresponding to each element displayed in the voltmeter is normal, and the method for determining whether the voltage corresponding to each element in the voltmeter is normal is that, first, a rated voltage is subtracted from the voltage corresponding to each element to obtain a voltage difference corresponding to each element, the voltage difference is compared with the preset voltage difference, and whether the voltage transformer has polarity reversal connection is determined according to a comparison result, and based on this, the method for determining whether the voltage transformer has polarity reversal connection according to the comparison result specifically is: and if any one voltage difference in the voltage differences is greater than or equal to the preset voltage difference, determining that the polarity of the voltage transformer is reversely connected.
Specifically, if any one of the voltage differences corresponding to the respective components is greater than or equal to the preset voltage difference, it is determined that the voltage corresponding to one of the components in the electric energy meter is an error voltage, and therefore it can be determined that the voltage transformer has a reverse polarity, for example, if the voltages corresponding to the respective components in the electric energy meter are respectively U 12 ＝103V，U 32 Setting the rated voltage to be 72V and the voltage corresponding to each element to be 3V and 73V respectively by subtracting the rated voltage from the voltage corresponding to each element, namely, U, to be 173V and 100V 32 Is increased on the basis of the rated voltage of 100V
The voltage 173V is an abnormal voltage, so that it may be determined that the voltage transformer has a polarity reversal, and meanwhile, if the voltage differences corresponding to the respective components are all smaller than the preset voltage difference, in order to determine whether the voltage transformer has a polarity reversal, it is further necessary to determine a target power factor interval corresponding to the respective components when the voltage transformer is correctly wired, and determine whether the voltage transformer has a polarity reversal based on the first total power factor, the power factor corresponding to the respective components, and the target power factor interval.
203. If the voltage differences are smaller than the preset voltage difference, a first power factor angle corresponding to a first element in the elements when the voltage transformer is correctly connected is obtained by adding the load power factor angle to the preset angle, and a second power factor angle corresponding to a second element in the elements when the voltage transformer is correctly connected is obtained by subtracting the load power factor angle from the preset angle.
For the embodiment of the present invention, the electric energy meter may be a three-phase three-wire electric energy meter, the three-phase three-wire electric energy meter includes two elements, and after determining whether each voltage difference is smaller than the preset voltage difference, the method further includes, if the voltage differences are smaller than the preset voltage difference, adding the load power factor angle to a preset angle to obtain a first power factor angle corresponding to a first element in each element when the voltage transformer is correctly wired, and simultaneously adding the load power factor angle to the preset angle to obtain a second power factor angle corresponding to a second element in each element when the voltage transformer is correctly wired, for example, when the preset angle is 30 °, the load power factor angle is 20 °,30 ° +20 ° =50 °, that is, when the voltage transformer is correctly wired, the first power factor angle corresponding to the first element is 50 °, and at the same time, 30 ° = 20 ° =10 °, that is correct wired, the second power factor angle corresponding to the second element is 10 °, and finally, based on the first power factor angle, the first power factor angle corresponding to the first element is determined, and the target power factor interval corresponding to the second element is determined based on the second power factor interval.
204. And determining a first target power factor interval corresponding to the first element when the voltage transformer is correctly wired based on the first power factor angle, and determining a second target power factor interval corresponding to the second element when the voltage transformer is correctly wired based on the second power factor angle.
For the embodiment of the present invention, in order to accurately determine whether the voltage transformer has a reverse polarity connection, when it is further required to determine that the first voltage transformer has a correct connection, a first target power factor interval corresponding to the first element and a second target power factor interval corresponding to the second element, based on which step 204 specifically includes: determining a first target angle interval in which the first power factor angle is located from a plurality of angle intervals; determining a first target cosine value interval corresponding to the first target angle interval; determining the first target cosine value interval as a first target power factor interval corresponding to the first element when the voltage transformer is correctly connected, and determining a second target angle interval in which the second power factor angle is located from the plurality of angle intervals; determining a second target cosine value interval corresponding to the second target angle interval; and determining the second target cosine value interval as a second target power factor interval corresponding to the second element when the voltage transformer is correctly connected.
Wherein the plurality of angle intervals includes a first angle interval of 0 ° -30 °, a second angle interval of 30 ° -60 °, and a third angle interval of 60 ° -90 °.
For the embodiment of the present invention, in order to determine a first target power factor interval corresponding to the first element and a second target power factor interval corresponding to the second element, first, a first target angle interval to which the first power factor angle belongs and a second target angle interval to which the second power factor angle belongs are determined among three angle intervals, a first cosine value corresponding to an upper limit angle and a second cosine value corresponding to a lower limit angle in the first angle interval are calculated, a range from the first cosine value to the second cosine value is determined as the first target cosine value interval, and finally, the first target cosine value interval is determined as the first target power factor interval.
For example, if a first power factor angle corresponding to a first element is 50 ° and a second power factor angle corresponding to a second element is 10 ° is obtained through calculation, because the first power factor angle is between 30 ° and 60 ° of the second angle interval, the second angle interval is determined as a first target angle interval corresponding to the first element, then a first cosine value corresponding to an upper limit angle of 60 ° in the first target angle interval is calculated as 0.5, and a second cosine value corresponding to a lower limit angle of 30 ° in the first target angle interval is calculated as 0.866, then a range from 0.5 to 0.866 between the first cosine value and the second cosine value is determined as the first target cosine value interval, and finally, determining the first target cosine value interval of 0.5-0.866 as the first target power factor interval, and similarly, because the second power factor angle of 10 degrees is between the first angle interval of 0-30 degrees, determining the first angle interval of 0-30 degrees as the second target angle interval corresponding to the second element, determining the third cosine value corresponding to 30 degrees as 0.866, and determining the fourth cosine value corresponding to 0 degrees as 1, determining the range of 0.866-1 from the third cosine value to the fourth cosine value as the second target cosine value interval, and finally determining the second target cosine value interval of 0.866-1 as the second target power factor interval.
205. And judging whether a first power factor corresponding to the first element is in the first target power factor interval or not and whether a second power factor corresponding to the second element is in the second target power factor interval or not.
For the embodiment of the present invention, after determining a first target power factor interval corresponding to a first element and a second target power factor interval corresponding to a second element, in order to determine whether a polarity reversal exists in the voltage transformer, it is necessary to respectively determine whether a first power factor corresponding to the first element is within the first target power factor interval, and simultaneously determine whether a second power factor corresponding to the second element is within the second target power factor interval, and determine whether a polarity reversal exists in the voltage transformer according to a determination result, where the specific determination method is: and if the first power factor corresponding to the first element is not in the first target power factor interval or/and the second power factor corresponding to the second element is not in the second target power factor interval, determining that the voltage transformer has reverse polarity.
Specifically, if the first power factor corresponding to the first element is not within the first target power factor interval and the second power factor corresponding to the second element is not within the second target power factor interval, it is determined that the voltage transformer has a reverse polarity connection, or the first power factor corresponding to the first element is not within the first target power factor interval but the second power factor corresponding to the second element is within the second target power factor interval, it is determined that the voltage transformer has a reverse polarity connection, or the first power factor corresponding to the first element is within the first target power factor interval but the second power factor corresponding to the second element is not within the second target power factor interval, it is determined that the voltage transformer has a reverse polarity connection, that is, it is determined that the voltage transformer has a reverse polarity connection only if the power factor of one of the elements is not within the target power factor interval corresponding to the power factor.
For example, if 30 ° is used as the change interval, the inductive load operates in quadrants i and iii, the capacitive load operates in quadrants ii and iv, the first power factor angle corresponding to the first element is 50 °, it is determined that the first target power factor interval corresponding to the first element is 0.5-0.866, the second power factor angle corresponding to the second element is 10 °, it is determined that the second target power factor interval corresponding to the second element is 0.866-1, the absolute value of the first power factor corresponding to the first element shown in the three-phase three-wire electric energy meter is 0.17, and the absolute value of the second power factor corresponding to the second element is 0.33, so that it can be known from the above data that the absolute value of the first power factor 0.17 is not within the first target power factor interval 0.5-0.866, and the absolute value of the second power factor 0.33 is not within the second target power factor interval 0.866-1, and it is determined that the voltage transformer has a reverse polarity. Meanwhile, the cosine value interval corresponding to the first angle interval of 0-30 degrees is 0.866-1, the cosine value interval corresponding to the second angle interval of 30-60 degrees is 0.5-0.866, the cosine value interval corresponding to the third angle interval of 60-90 degrees is 0-0.5, 0-0.5 can be marked as "small", 0.5-0.866 is marked as "medium", 0.866-1 is marked as "large", if the first power factor absolute value is 0.6, the first target power factor interval is 0.5-0.866, the second power factor absolute value is 0.44, the second target power factor interval is 0.866-1, when the voltage transformer is correctly connected, the power factor rule corresponding to the first element and the second element respectively is "medium large", the first power factor absolute value is 0.6 between 0.5-0.866, the second power factor absolute value is 0.44 between 0.44 and 0.5 ", and the polarity reversal rule exists when the voltage transformer is" medium-small ".
Further, if the first power factor is within the first target power factor interval and the second power factor is within the second target power factor interval, in order to determine whether the voltage transformer has a polarity reversal, it is further required to determine whether the voltage transformer has a polarity reversal based on the power factor corresponding to each element and the first total power factor displayed in the electric energy meter.
206. And if the first power factor is within the first target power factor interval and the second power factor is within the second target power factor interval, determining whether the polarity of the voltage transformer is reversed or not based on the first total power factor, the first power factor and the second power factor.
For the embodiment of the present invention, after determining whether the first power factor is within the first target power factor interval and whether the second target power factor is within the second target power factor interval, if the first power factor is within the first target power factor interval and the second power factor is within the second target power factor interval, step 206 specifically includes: adding the first power factor and the second power factor to obtain a second total power factor corresponding to the first element and the second element together; dividing the second total power factor by the first total power factor to obtain a detection value corresponding to the voltage transformer; judging whether the detection value is equal to a preset threshold value or not; if the detection value is not equal to the preset threshold value, determining that the voltage transformer has polarity reversal connection; and if the detection value is equal to the preset threshold value, determining that the voltage transformer is connected correctly.
For the embodiment of the present invention, when each voltage difference is smaller than a preset voltage difference, and the power factor of each element is within the corresponding target power factor interval, to further improve the detection accuracy of the polarity reversal of the voltage transformer, first, the first power factor and the second power factor are added to obtain a second total power factor, and the second total power factor is divided by the first total power factor to obtain a detection value corresponding to the voltage transformer, where a formula for specifically calculating the detection value corresponding to the voltage transformer is as follows:
wherein a represents the detected value,
which is indicative of a first power factor,
which is indicative of a second power factor,
which is indicative of a first total power factor,
and expressing a second total power factor, so that a detection value corresponding to the voltage transformer can be calculated according to the formula, the detection value is compared with a preset threshold value, if the detection value is equal to the preset threshold value, the voltage transformer is determined to be correctly wired, and if the detection value is not equal to the preset threshold value, the voltage transformer is determined to be correctly wiredDetermining that the voltage transformer has a reverse polarity, e.g. a predetermined threshold of
The first power factor is-0.75, the second power factor is 0.66, and the first total power factor displayed in the three-phase three-wire electric energy meter is-0.32, then the detection value corresponding to the voltage transformer calculated according to the formula is (-0.75 + 0.66)/-0.32 =0.31, and the 0.31 is far smaller than
It can be determined that there is a reverse polarity connection of the voltage transformer.
According to another detection method for the polarity reversal of the voltage transformer, compared with the mode that whether the voltage transformer has the polarity reversal is judged by measuring related data at an electric energy meter terminal box by using a test instrument at present, the method obtains a first total power factor displayed by a three-phase three-wire electric energy meter connected with the voltage transformer in the working process, power factors and voltages corresponding to all components and a load power factor angle of a circuit detected by the three-phase three-wire electric energy meter; subtracting the rated voltage from the voltage corresponding to each element to obtain a voltage difference corresponding to each element, and judging whether each voltage difference is smaller than a preset voltage difference; if the voltage differences are smaller than the preset voltage difference, determining a target power factor interval corresponding to each element when the voltage transformer is correctly connected based on the load power factor angle; judging whether the power factor corresponding to each element is in the corresponding target power factor interval; if the power factors corresponding to the elements are all in the corresponding target power factor intervals, whether the voltage transformer is connected in a reverse polarity mode is judged based on the first total power factor and the power factors corresponding to the elements, therefore, by obtaining the first total power factor displayed by the electric energy meter connected with the voltage transformer in the working process, the power factor and the voltage corresponding to the elements and the load power factor angle of the circuit to be detected, whether the voltage difference between each voltage and the rated voltage is smaller than a preset voltage difference and smaller than the preset voltage difference, the target power factor interval corresponding to each element needs to be determined, whether the power factor corresponding to each element is in the corresponding target power factor interval is judged, and if the power factor corresponding to each element is in the corresponding power factor interval, whether the polarity of the voltage transformer is connected in a reverse polarity mode is judged based on the power factor corresponding to each element and the first total power factor finally, whether the polarity of the voltage transformer is connected in a reverse polarity mode is judged, meanwhile, the situation that the testing instrument is installed wrongly because of different technical levels of workers is avoided, wrong data is measured, and the polarity detection accuracy of the voltage transformer in the reverse polarity is improved.
Further, as a specific implementation of fig. 1, an embodiment of the present invention provides a detection apparatus for detecting polarity reversal of a voltage transformer, as shown in fig. 3, the apparatus includes: an acquisition unit 31, a subtraction unit 32, a determination unit 33, a first judgment unit 34, and a second judgment unit 35.
The obtaining unit 31 may be configured to obtain a first total power factor displayed by the electric energy meter connected to the voltage transformer during operation, power factors and voltages corresponding to the respective components, and a load power factor angle of a circuit connected to the electric energy meter.
The subtracting unit 32 may be configured to subtract the rated voltage from the voltage corresponding to each element to obtain a voltage difference corresponding to each element, and determine whether each voltage difference is smaller than a preset voltage difference.
The determining unit 33 may be configured to determine, based on the load power factor angle, a target power factor interval corresponding to each element when the voltage transformer is correctly wired if each voltage difference is smaller than the preset voltage difference.
The first determining unit 34 may be configured to determine whether the power factor corresponding to each element is within the corresponding target power factor interval.
The second determining unit 35 may be configured to determine whether the polarity of the voltage transformer is reversed based on the first total power factor and the power factors corresponding to the respective elements if the power factors corresponding to the respective elements are within the target power factor intervals corresponding to the respective elements.
In a specific application scenario, in order to determine the target power factor intervals corresponding to the respective elements when the voltage transformer is correctly wired based on the load power factor angle, as shown in fig. 4, the determining unit 33 includes a first adding module 331, a subtracting module 332, and a first determining module 333.
The first adding module 331 may be configured to add the load power factor angle by using a preset angle to obtain a first power factor angle corresponding to the first element when the voltage transformer is correctly wired.
The subtracting module 332 may be configured to subtract the load power factor angle from the preset angle to obtain a second power factor angle corresponding to the second element when the voltage transformer is correctly wired.
The first determining module 333 may be configured to determine, based on the first power factor angle, a first target power factor interval corresponding to the first element when the voltage transformer is correctly wired, and determine, based on the second power factor angle, a second target power factor interval corresponding to the second element when the voltage transformer is correctly wired.
In a specific application scenario, in order to determine a first target power factor interval corresponding to the first element and a second target power factor interval corresponding to the second element when the voltage transformer is correctly wired, the first determining module 333 may be specifically configured to determine, from a plurality of angle intervals, a first target angle interval in which the first power factor angle is located; determining a first target cosine value interval corresponding to the first target angle interval; determining the first target cosine value interval as a first target power factor interval corresponding to the first element when the voltage transformer is correctly connected; and determining a second target angle interval in which the second power factor angle is located from the plurality of angle intervals; determining a second target cosine value interval corresponding to the second target angle interval; and determining the second target cosine value interval as a second target power factor interval corresponding to the second element when the voltage transformer is correctly connected.
In a specific application scenario, in order to determine whether the power factor corresponding to each element is within the corresponding target power factor interval, the first determining unit 34 may be specifically configured to determine whether the first power factor corresponding to the first element is within the first target power factor interval, and whether the second power factor corresponding to the second element is within the second target power factor interval.
In a specific application scenario, in order to determine whether the polarity of the voltage transformer is reversed, the second determining unit 35 includes a second adding module 351, a dividing module 352, a determining module 353, and a second determining module 354.
The second adding module 351 may be configured to add the first power factor and the second power factor to obtain a second total power factor corresponding to both the first element and the second element.
The dividing module 352 may be configured to divide the second total power factor by the first total power factor to obtain a detection value corresponding to the voltage transformer.
The determining module 353 may be configured to determine whether the detection value is equal to a preset threshold.
The second determining module 354 may be configured to determine that the voltage transformer has a reverse polarity connection if the detection value is not equal to the preset threshold.
In a specific application scenario, in order to determine whether the voltage transformer has a polarity reversal based on the voltage differences, the determining unit 33 may be further configured to determine that the voltage transformer has a polarity reversal if any one of the voltage differences is greater than or equal to the preset voltage difference.
In a specific application scenario, in order to determine whether the voltage transformer has a polarity reversal based on the power factor of each element and the target power factor interval corresponding to the power factor, the determining unit 33 may be further configured to determine that the voltage transformer has a polarity reversal if the first power factor corresponding to the first element is not within the first target power factor interval or/and the second power factor corresponding to the second element is not within the second target power factor interval.
It should be noted that other corresponding descriptions of the functional modules related to the detection apparatus for detecting polarity reversal of a voltage transformer provided in the embodiment of the present invention may refer to the corresponding description of the method shown in fig. 1, and are not described herein again.
Based on the method shown in fig. 1, correspondingly, an embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the following steps: acquiring a first total power factor displayed by an electric energy meter connected with a voltage transformer in the working process, power factors and voltages corresponding to all elements, and a load power factor angle of a circuit measured by the electric energy meter; subtracting the rated voltage from the voltage corresponding to each element to obtain a voltage difference corresponding to each element, and judging whether each voltage difference is smaller than a preset voltage difference; if the voltage differences are smaller than the preset voltage difference, determining a target power factor interval corresponding to each element when the voltage transformer is correctly connected based on the load power factor angle; judging whether the power factor corresponding to each element is in the corresponding target power factor interval; and if the power factors corresponding to the elements are all in the corresponding target power factor intervals, judging whether the polarity of the voltage transformer is reversely connected or not based on the first total power factor and the power factors corresponding to the elements.
Based on the above embodiments of the method shown in fig. 1 and the apparatus shown in fig. 3, an embodiment of the present invention further provides an entity structure diagram of a computer device, as shown in fig. 5, where the computer device includes: a processor 41, a memory 42, and a computer program stored on the memory 42 and executable on the processor, wherein the memory 42 and the processor 41 are both arranged on a bus 43 such that when the processor 41 executes the program, the following steps are performed: acquiring a first total power factor displayed by an electric energy meter connected with a voltage transformer in the working process, power factors and voltages corresponding to all elements, and a load power factor angle of a circuit measured by the electric energy meter; subtracting the rated voltage from the voltage corresponding to each element to obtain a voltage difference corresponding to each element, and judging whether each voltage difference is smaller than a preset voltage difference; if the voltage differences are smaller than the preset voltage difference, determining a target power factor interval corresponding to each element when the voltage transformer is correctly wired based on the load power factor angle; judging whether the power factor corresponding to each element is in the corresponding target power factor interval; and if the power factors corresponding to the elements are all in the corresponding target power factor intervals, judging whether the polarity of the voltage transformer is in reverse connection or not based on the first total power factor and the power factors corresponding to the elements.
According to the technical scheme, the first total power factor displayed by the electric energy meter connected with the voltage transformer in the working process, the power factor and the voltage corresponding to each element and the load power factor angle of the circuit detected by the electric energy meter are obtained; subtracting the rated voltage from the voltage corresponding to each element to obtain a voltage difference corresponding to each element, and judging whether each voltage difference is smaller than a preset voltage difference; if the voltage differences are smaller than the preset voltage difference, determining a target power factor interval corresponding to each element when the voltage transformer is correctly connected based on the load power factor angle; judging whether the power factor corresponding to each element is in the corresponding target power factor interval; if the power factors corresponding to the elements are all in the corresponding target power factor intervals, whether the polarity of the voltage transformer is reversely connected is judged based on the first total power factor and the power factors corresponding to the elements, so that whether the first total power factor, the power factor and the voltage corresponding to the elements and the load power factor angle of the circuit are displayed in the working process of the electric energy meter connected with the voltage transformer is judged, whether the voltage difference between the voltage and the rated voltage is smaller than a preset voltage difference and smaller than the preset voltage difference is judged, the target power factor interval corresponding to the elements is required to be determined, whether the power factor corresponding to the elements is in the corresponding target power factor interval is judged, if the power factor corresponding to the elements is in the corresponding power factor interval, whether the polarity of the voltage transformer is reversely connected is judged based on the power factor corresponding to the elements and the first total power factor, the detection efficiency of the polarity reverse connection of the voltage transformer is improved, and meanwhile, the detection accuracy of the reverse connection of the voltage transformer caused by wrong instrument installation is improved due to the fact that technical levels of workers are different.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A detection method for polarity reversal of a voltage transformer is characterized by being applied to an electric energy meter and comprising the following steps:
acquiring a first total power factor displayed by an electric energy meter connected with a voltage transformer in the working process, power factors and voltages corresponding to all elements, and a load power factor angle of a circuit measured by the electric energy meter;
subtracting the rated voltage from the voltage corresponding to each element to obtain a voltage difference corresponding to each element, and judging whether each voltage difference is smaller than a preset voltage difference;
if the voltage differences are smaller than the preset voltage difference, determining a target power factor interval corresponding to each element when the voltage transformer is correctly wired based on the load power factor angle;
judging whether the power factor corresponding to each element is in the corresponding target power factor interval;
and if the power factors corresponding to the elements are all in the corresponding target power factor intervals, judging whether the polarity of the voltage transformer is reversely connected or not based on the first total power factor and the power factors corresponding to the elements.
2. The method of claim 1, wherein the individual components comprise a first component and a second component, and wherein determining the target power factor interval for the individual components when the voltage transformer is properly wired based on the load power factor angle comprises:
obtaining a first power factor angle corresponding to the first element when the voltage transformer is correctly connected by adding the load power factor angle to a preset angle;
subtracting the load power factor angle from the preset angle to obtain a second power factor angle corresponding to the second element when the voltage transformer is correctly connected;
and determining a first target power factor interval corresponding to the first element when the voltage transformer is correctly wired based on the first power factor angle, and determining a second target power factor interval corresponding to the second element when the voltage transformer is correctly wired based on the second power factor angle.
3. The method of claim 2, wherein determining a first target power factor interval for the first element when the voltage transformer is properly wired based on the first power factor angle comprises:
determining a first target angle interval in which the first power factor angle is located from a plurality of angle intervals;
determining a first target cosine value interval corresponding to the first target angle interval;
determining the first target cosine value interval as a first target power factor interval corresponding to the first element when the voltage transformer is correctly connected;
the determining a second target power factor interval corresponding to the second element when the voltage transformer is correctly wired based on the second power factor angle includes:
determining a second target angle interval in which the second power factor angle is located from the plurality of angle intervals;
determining a second target cosine value interval corresponding to the second target angle interval;
and determining the second target cosine value interval as a second target power factor interval corresponding to the second element when the voltage transformer is correctly connected.
4. The method of claim 3, wherein the power factor corresponding to each element comprises a first power factor corresponding to the first element and a second power factor corresponding to the second element, and the determining whether the power factor corresponding to each element is within the target power factor interval corresponding to each element comprises:
and judging whether a first power factor corresponding to the first element is in the first target power factor interval or not and whether a second power factor corresponding to the second element is in the second target power factor interval or not.
5. The method of claim 1, wherein the determining whether the voltage transformer is connected in a reverse polarity based on the first total power factor and the power factors corresponding to the respective components comprises:
adding the first power factor and the second power factor to obtain a second total power factor corresponding to the first element and the second element together;
dividing the second total power factor by the first total power factor to obtain a detection value corresponding to the voltage transformer;
judging whether the detection value is equal to a preset threshold value or not;
if the detection value is not equal to the preset threshold value, determining that the voltage transformer has reverse polarity connection;
and if the detection value is equal to the preset threshold value, determining that the voltage transformer is connected correctly.
6. The method of claim 1, wherein after determining whether each voltage difference is less than a preset voltage difference, the method further comprises:
and if any one of the voltage differences is greater than or equal to the preset voltage difference, determining that the polarity of the voltage transformer is reversely connected.
7. The method according to claim 1, wherein after said determining whether the power factor corresponding to each element is within the corresponding target power factor interval, the method further comprises:
and if the first power factor corresponding to the first element is not in the first target power factor interval or/and the second power factor corresponding to the second element is not in the second target power factor interval, determining that the voltage transformer has reverse polarity.
8. The utility model provides a detection apparatus for voltage transformer polarity reversal, its characterized in that includes:
the acquisition unit is used for acquiring a first total power factor displayed by the electric energy meter connected with the voltage transformer in the working process, power factors and voltages corresponding to all elements and a load power factor angle of a circuit measured by the electric energy meter;
the subtracting unit is used for subtracting the rated voltage from the voltage corresponding to each element to obtain the voltage difference corresponding to each element, and judging whether each voltage difference is smaller than the preset voltage difference;
the determining unit is used for determining a target power factor interval corresponding to each element when the voltage transformer is correctly wired based on the load power factor angle if each voltage difference is smaller than the preset voltage difference;
the first judging unit is used for judging whether the power factor corresponding to each element is in the corresponding target power factor interval;
and the second judging unit is used for judging whether the polarity of the voltage transformer is reversely connected or not based on the first total power factor and the power factors corresponding to the elements if the power factors corresponding to the elements are in the corresponding target power factor intervals.
9. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 7.
10. A computer arrangement comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the computer program realizes the steps of the method of any one of claims 1 to 7 when executed by the processor.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117741520A (en) * | 2023-12-15 | 2024-03-22 | 国网江苏省电力有限公司扬州供电分公司 | Remote judging method for polarity reversal of voltage transformer of three-phase three-wire metering device |
| CN117805690A (en) * | 2024-02-28 | 2024-04-02 | 西安为光能源科技有限公司 | Method for detecting polarity reversal of double-active-bridge topological isolation transformer |
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- 2022-08-29 CN CN202211040968.8A patent/CN115236554A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117741520A (en) * | 2023-12-15 | 2024-03-22 | 国网江苏省电力有限公司扬州供电分公司 | Remote judging method for polarity reversal of voltage transformer of three-phase three-wire metering device |
| CN117741520B (en) * | 2023-12-15 | 2024-05-31 | 国网江苏省电力有限公司扬州供电分公司 | Remote judging method for polarity reversal of voltage transformer of three-phase three-wire metering device |
| CN117805690A (en) * | 2024-02-28 | 2024-04-02 | 西安为光能源科技有限公司 | Method for detecting polarity reversal of double-active-bridge topological isolation transformer |
| CN117805690B (en) * | 2024-02-28 | 2024-05-03 | 西安为光能源科技有限公司 | Method for detecting polarity reversal of double-active-bridge topological isolation transformer |
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