CN112965013A - Electric power measurement V-V wiring PT secondary reverse polarity judgment device - Google Patents
Electric power measurement V-V wiring PT secondary reverse polarity judgment device Download PDFInfo
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- CN112965013A CN112965013A CN202110284411.8A CN202110284411A CN112965013A CN 112965013 A CN112965013 A CN 112965013A CN 202110284411 A CN202110284411 A CN 202110284411A CN 112965013 A CN112965013 A CN 112965013A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/72—Testing of electric 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
Abstract
The invention relates to a power metering V-V wiring PT secondary reverse polarity judgment device which comprises a processor, a voltage sampling module, an A/D conversion module, a data storage module, a power supply module and a display module, wherein the A/D conversion module, the data storage module, the power supply module and the display module are electrically connected with the processor; the input end of the voltage sampling module is electrically connected with a three-phase terminal of the secondary side of the tested voltage transformer and is used for collecting the three-phase voltage of the tested voltage transformer; the input end of the A/D conversion module is electrically connected with the output end of the voltage sampling module and is used for converting the three-phase voltage analog signals collected by the voltage sampling module into digital signals and outputting the digital signals to the processor; the data storage module stores a mapping relation between three-phase voltage of the secondary side of the voltage transformer and the reversed polarity type of the secondary side of the voltage transformer; the processor receives the digital signals of the three-phase voltage and inputs the digital signals into the data storage module to obtain a judgment result, and the judgment result is displayed through the display module.
Description
Technical Field
The invention relates to a power metering V-V wiring PT secondary reverse polarity judgment device, and belongs to the technical field of power equipment.
Background
The electric power metering system is composed of an electric energy meter, a voltage transformer (PT), a Current Transformer (CT) and a secondary circuit for metering. The reverse polarity of PT secondary polarity forming the electric power metering system can cause the electric energy metering to be inaccurate, and bring loss to both power supply and power utilization. In addition, the abnormal connection of the metering secondary circuit can cause the mutual inductor to be burnt and exploded, thereby causing property loss and safety problems for power users. Therefore, when the electricity stealing prevention treatment is carried out, the metering device has a fault or is newly installed and increased in capacity, the testing and acceptance of the metering device need to check the connection of the PT, and the operation of the mutual inductor needs to be checked in the operation process. The traditional analysis and judgment method adopts the phase diagram of carved PT secondary polarity reversal to summarize the drawing method of the phase diagram, and judges by means of remembering hard several templates, the method is easy to be confused for new metrologists or workers with relatively weak memory capacity, a unified analysis device is not formed, and the judgment efficiency is low.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides an electric power measurement V-V wiring PT secondary reverse polarity judging device which can automatically judge whether the electric power measurement V-V wiring PT has secondary reverse polarity or not and improve the working efficiency.
The technical scheme of the invention is as follows:
a secondary reverse polarity judgment device for a power metering V-V wiring PT comprises a processor, a voltage sampling module, an A/D conversion module, a data storage module, a power supply module and a display module, wherein the A/D conversion module, the data storage module, the power supply module and the display module are electrically connected with the processor; the input end of the voltage sampling module is electrically connected with a three-phase terminal of the secondary side of the tested voltage transformer and is used for collecting the three-phase voltage of the tested voltage transformer; the input end of the A/D conversion module is electrically connected with the output end of the voltage sampling module and is used for converting the three-phase voltage analog signals collected by the voltage sampling module into digital signals and outputting the digital signals to the processor; the data storage module is electrically connected with the processor and is used for storing the mapping relation between the three-phase voltage of the secondary side of the voltage transformer and the reversed polarity type of the secondary side of the voltage transformer; the power supply module is used for supplying electric energy to the device; the processor receives the digital signals of the three-phase voltage input by the A/D conversion module, inputs the digital signals of the three-phase voltage to the data storage module, judges whether the consistent secondary side reversed polarity type of the voltage transformer exists or not, and obtains a judgment result; and the input end of the display module is electrically connected with the processor and used for receiving and displaying the judgment result.
Furthermore, the system also comprises a human-computer interaction module which is electrically connected with the processor and used for human-computer interaction.
The invention has the following beneficial effects:
the invention relates to a device for judging secondary reverse polarity of a power metering V-V wiring PT (potential transformer). the device is provided with a data storage module, wherein the data storage module is pre-stored with the mapping relation between the secondary side three-phase voltage and the secondary reverse polarity of a voltage transformer, so that whether the secondary reverse polarity occurs or not can be automatically judged, and the working efficiency is improved
Drawings
Fig. 1 is a schematic block diagram of the apparatus of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and the specific embodiments.
The first embodiment is as follows:
referring to fig. 1, the electric power metering V-V wiring PT secondary reverse polarity judgment device includes a processor 1, a voltage sampling module 2, an a/D conversion module 3 electrically connected to the processor 1, a data storage module 4, a power supply module 5 and a display module 6; the input end of the voltage sampling module 2 is electrically connected with a three-phase terminal of the secondary side of the tested voltage transformer and is used for collecting the three-phase voltage of the tested voltage transformer; the input end of the A/D conversion module 3 is electrically connected with the output end of the voltage sampling module 2, and is used for converting the three-phase voltage analog signals collected by the voltage sampling module into digital signals and outputting the digital signals to the processor 1; the data storage module 4 is electrically connected with the processor 1 and is used for storing the mapping relation between the three-phase voltage of the secondary side of the voltage transformer and the reversed polarity type of the secondary side of the voltage transformer; the power supply module 5 is used for supplying electric energy to the device; the processor 1 receives the digital signals of the three-phase voltage input by the A/D conversion module 3, inputs the digital signals of the three-phase voltage to the data storage module 4, judges whether the corresponding secondary side reversed polarity type of the voltage transformer exists or not, and obtains a judgment result; the input end of the display module 6 is electrically connected with the processor 1 and is used for receiving and displaying the judgment result; in this embodiment, the processor 1 may adopt a single chip, a microprocessor, a CPU processor, or the like; the display module 6 adopts an electronic liquid crystal display screen.
Further, the system also comprises a human-computer interaction module 7, wherein the human-computer interaction module 7 is electrically connected with the processor 1 and is used for human-computer interaction; in this embodiment, the human-computer interaction module 7 may adopt a key circuit, an electronic touch screen, or the like, a person using the device inputs a control instruction through the human-computer interaction module, and the processor completes corresponding operations according to the instruction.
The working principle of the embodiment is as follows:
firstly, the following statistics is made on the conditions of the relevant angles, the voltage amplitudes and the like of the 12 wrong wiring types, as shown in table 1:
statistical table of 112 kinds of wrong wiring types
According to the statistical conditions of table 1, the following rules can be derived by inductive reasoning:
rule one: when in use
As a reference phasor, for example,
advance in
When the angle is 30 degrees and 120 degrees, the voltage access phase sequence is a positive phase sequence;
advance in
When the angle of the voltage switching-in phase sequence is 330 degrees and 240 degrees, the voltage switching-in phase sequence is a reverse phase sequence.
Rule two: when the voltage amplitude U12 is equal to U32 is equal to 100V, phase B is an intermediate phase, that is, the phase sequence is XBX, where X represents a or C; when the voltage amplitude U12 is 100V and U32 is 173V, the phase B is the first phase, i.e., the phase sequence is BXX, where X represents a or C; when the voltage amplitude U12 is 173V and U32 is 100V, phase B is the last phase, i.e. the phase sequence XXB, where X represents a or C.
By combining the first rule and the second rule, the voltage access mode can be obtained through reasoning according to the measured voltage amplitude and phase angle, namely U1, U2 and U3 respectively represent the specific phases, so that the reference voltage coordinate is obtained.
Rule three: when a two-element voltage phasor is plotted, the voltage phasor with the amplitude of 100V in the measurement results U12 and U32 is used as an analysis object, and the analysis results are shown in table 2:
TABLE 2 analysis of reverse phase
The meaning of the rule III is that when PT secondary reverse polarity is assumed, whether phasor with the amplitude of 100V is related to the assumed phase or not is analyzed, if so, the phasor is described as the reverse quantity of the original phasor, if not, the phasor is described according to the original phasor, and the voltage phasor of the other element is described according to the measurement angles of U12 and U32. For example, assuming that the PT of the a phase has secondary reverse polarity, if U12 ═ Uab ═ 100V, then U12 is drawn as the reverse quantity of the original phasor; if U12 ═ Ucb ═ 100V, then U12 is plotted as the original phasor, and then U32 is plotted as the measured angle between U12 and U32.
The voltage access mode can be accurately analyzed and judged by combining the first rule and the second rule of the inductive reasoning; according to rule three, the voltage phasors for a second element can be characterized according to whether the phasor corresponding to a voltage amplitude of 100V is related to the assumed reverse phase. And then according to the angle between the measured current and the U12, a complete wrong wiring phasor diagram can be obtained, and a correction coefficient and a back-up power quantity can be obtained finally.
And storing the mapping relation between the three-phase voltage of the secondary side of the voltage transformer and the reversed polarity type of the secondary side of the voltage transformer into the data storage module 4.
When the device is used specifically, the three-phase voltage of the secondary side of the tested voltage transformer is collected through the voltage sampling module 2, the processor 1 inputs the three-phase voltage digital signals of the secondary side of the tested voltage transformer into the data storage module 4 after acquiring the three-phase voltage digital signals of the secondary side of the tested voltage transformer, the mapping relation of the reversed polarity of the secondary side of the voltage transformer corresponding to the three-phase voltage of the secondary side of the tested voltage transformer is acquired, a judgment result is obtained according to the mapping relation and returned to the processor 1, and the processor 1 outputs the judgment result to the display module 6 for displaying.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (2)
1. The utility model provides an electric power measurement V-V wiring PT secondary reverse polarity judgement device which characterized in that: the device comprises a processor (1), a voltage sampling module (2), an A/D conversion module (3), a data storage module (4), a power supply module (5) and a display module (6), wherein the A/D conversion module, the data storage module (4), the power supply module and the display module are electrically connected with the processor (1); the input end of the voltage sampling module (2) is electrically connected with a three-phase terminal of the secondary side of the tested voltage transformer and is used for collecting the three-phase voltage of the tested voltage transformer; the input end of the A/D conversion module (3) is electrically connected with the output end of the voltage sampling module (2) and is used for converting the three-phase voltage analog signals acquired by the voltage acquisition module into digital signals and outputting the digital signals to the processor (1); the data storage module (4) is electrically connected with the processor (1) and is used for storing the mapping relation between the three-phase voltage of the secondary side of the voltage transformer and the reversed polarity type of the secondary side of the voltage transformer; the power supply module (5) is used for supplying electric energy to the device; the processor (1) receives the digital signals of the three-phase voltage input by the A/D conversion module (3), inputs the digital signals of the three-phase voltage to the data storage module (4), judges whether the corresponding secondary side reverse polarity type of the voltage transformer exists or not, and obtains a judgment result; the input end of the display module (6) is electrically connected with the processor (1) and is used for receiving and displaying the judgment result.
2. The electric power metering V-V wiring PT secondary reverse polarity judging device according to claim 1, characterized in that: the intelligent monitoring system is characterized by further comprising a human-computer interaction module (7), wherein the human-computer interaction module (7) is electrically connected with the processor (1) and is used for human-computer interaction.
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| CN202110284411.8A CN112965013B (en) | 2021-03-17 | 2021-03-17 | Electric power measurement V-V wiring PT secondary reverse polarity judgment device |
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| CN202110284411.8A CN112965013B (en) | 2021-03-17 | 2021-03-17 | Electric power measurement V-V wiring PT secondary reverse polarity judgment device |
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| CN112965013B CN112965013B (en) | 2023-01-31 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114325484A (en) * | 2021-12-23 | 2022-04-12 | 广州发展电力科技有限公司 | Method for checking wiring of secondary circuit of voltage transformer of generator |
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| CN103969546A (en) * | 2013-01-30 | 2014-08-06 | 江苏省电力公司常州供电公司 | Intelligent tester for secondary polarities of four-star voltage transformers |
| CN204214991U (en) * | 2014-12-04 | 2015-03-18 | 国家电网公司 | A kind of equipment and system of testing electronic mutual inductor polarity |
| CN106970345A (en) * | 2017-04-07 | 2017-07-21 | 国网浙江乐清市供电公司 | Portable type current transformer secondary connection polarity test device |
| CN207281269U (en) * | 2017-09-20 | 2018-04-27 | 国网天津市电力公司电力科学研究院 | Capacitance type potential transformer polarity measurement device |
| CN108181545A (en) * | 2017-12-29 | 2018-06-19 | 国家电网公司 | A kind of polarity test circuit for current transformer |
| CN112083372A (en) * | 2020-08-21 | 2020-12-15 | 深圳供电局有限公司 | Current transformer polarity identification method and system |
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2021
- 2021-03-17 CN CN202110284411.8A patent/CN112965013B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103969546A (en) * | 2013-01-30 | 2014-08-06 | 江苏省电力公司常州供电公司 | Intelligent tester for secondary polarities of four-star voltage transformers |
| CN204214991U (en) * | 2014-12-04 | 2015-03-18 | 国家电网公司 | A kind of equipment and system of testing electronic mutual inductor polarity |
| CN106970345A (en) * | 2017-04-07 | 2017-07-21 | 国网浙江乐清市供电公司 | Portable type current transformer secondary connection polarity test device |
| CN207281269U (en) * | 2017-09-20 | 2018-04-27 | 国网天津市电力公司电力科学研究院 | Capacitance type potential transformer polarity measurement device |
| CN108181545A (en) * | 2017-12-29 | 2018-06-19 | 国家电网公司 | A kind of polarity test circuit for current transformer |
| CN112083372A (en) * | 2020-08-21 | 2020-12-15 | 深圳供电局有限公司 | Current transformer polarity identification method and system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114325484A (en) * | 2021-12-23 | 2022-04-12 | 广州发展电力科技有限公司 | Method for checking wiring of secondary circuit of voltage transformer of generator |
| CN114325484B (en) * | 2021-12-23 | 2024-03-22 | 广州发展电力科技有限公司 | Wiring inspection method for secondary circuit of generator voltage transformer |
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