CN113325337B - Source-side current transformer wiring detection method and system and current management equipment - Google Patents
Source-side current transformer wiring detection method and system and current management equipment Download PDFInfo
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- CN113325337B CN113325337B CN202110404106.8A CN202110404106A CN113325337B CN 113325337 B CN113325337 B CN 113325337B CN 202110404106 A CN202110404106 A CN 202110404106A CN 113325337 B CN113325337 B CN 113325337B
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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
- G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
- G01R31/67—Testing the correctness of wire connections in electric apparatus or circuits
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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Abstract
The invention discloses a source side current transformer wiring detection method, a source side current transformer wiring detection system and current management equipment, wherein the method comprises the following steps: the current management equipment outputs current to one side of a power grid, acquires first current detected by current detection equipment on the power grid side and second current detected by current detection equipment from the current management equipment to a junction point, analyzes phase angles of the first current and the second current, and analyzes the wiring condition of the current detection equipment on the power grid side according to the phase angles of the first current and the second current; according to the invention, a third-party independent detection device is not required to be additionally introduced, the wiring condition of the current detection device can be automatically detected on line, the cost is low, and the current control device can automatically output current to ensure the stability of current detection, so that the current cannot be difficult to analyze due to large current fluctuation; furthermore, the current is ensured to flow to the power grid side instead of the load side by sending harmonic waves, the magnitude of the output current can be adjusted in real time according to the rated current of the current detection equipment, and the sampling error of the power grid current is reduced.
Description
Technical Field
The invention relates to the field of power grids, in particular to a source-side current transformer wiring detection method and system and current management equipment.
Background
In the working process of the active power filter and the static var generator, the compensation current needs to be calculated through external current detection equipment (generally a current transformer), at the moment, the on-site current detection equipment needs to be ensured to be correctly wired, otherwise, the current compensation calculation fails, and even positive feedback of the current compensation equipment can be caused under severe conditions, so that system breakdown is caused, and therefore the current compensation equipment needs to ensure the wiring correctness of a current detection device.
At present, whether the wiring of the current detection device is correct or not is mainly analyzed through visual observation or through a third-party independent current detection device, but the following problems can exist in the judgment through the methods: the on-site wiring is disordered or in a dangerous condition, and the naked eyes are difficult to accurately judge whether the wiring of the detection equipment is correct or not, and even misjudgment can be caused; the situation that data are difficult to analyze or analysis errors can occur sometimes when the third-party independent detection equipment is used, and in addition, the cost can be increased due to the fact that the third-party independent detection equipment is added; the third-party detection device has the problem of slow data refreshing, and is difficult to use in the field with fast current change.
Disclosure of Invention
The invention aims to solve the technical problem of providing a source-side current transformer wiring detection method, a source-side current transformer wiring detection system and current management equipment aiming at the defects in the prior art.
The technical scheme adopted by the invention for solving the technical problem is as follows: a method for detecting the wiring of a source side current transformer of current governance equipment is constructed, and the method comprises the following steps:
the current management equipment outputs current to one side of a power grid, and obtains first current detected by current detection equipment on the side of the power grid and second current detected by current detection equipment from the current management equipment to a confluence point;
and analyzing the phase angles of the first current and the second current, and analyzing the wiring condition of the current detection equipment on the power grid side according to the phase angles of the first current and the second current.
Preferably, the current harnessing device outputs current to the side of the power grid, and comprises: the current governance device outputs a harmonic current of a specific frequency, which is a frequency not included in the load current, and sets the amplitude of the harmonic current according to the rated current of the current detection device on the grid side.
Preferably, the analyzing the wiring condition of the current detection device on the grid side according to the phase angle of the two comprises:
calculating a phase angle difference value of each phase of the second current and the first current;
for phase A, if the phase angle difference is within the error fluctuation range taking 0 degrees, -120 degrees or 120 degrees as a reference, the wiring of the current detection equipment on the power grid side is judged not to be in phase opposition, and correspondingly, the phase A of the current detection equipment is connected with the phase A, the phase B or the phase C of the power grid; if the phase angle difference value is within an error fluctuation range taking-180 degrees, 60 degrees or-60 degrees as a reference, judging the wiring phase reversal of the current detection equipment on the power grid side, and correspondingly, connecting the phase A of the current detection equipment with the phase A, the phase B or the phase C of the power grid;
for the phase B, if the phase angle difference value is within the error fluctuation range taking 0 degrees, -120 degrees or 120 degrees as a reference, the wiring of the current detection equipment on the power grid side is judged not to be in phase opposition, and correspondingly, the phase B of the current detection equipment is connected with the phase B, the phase C or the phase A of the power grid; if the phase angle difference value is in an error fluctuation range taking-180 degrees, 60 degrees or-60 degrees as a benchmark, judging the wiring phase of the current detection equipment on the side of the power grid, and correspondingly, connecting the phase B of the current detection equipment with the phase B, C or A of the power grid;
for the phase C, if the phase angle difference value is within the error fluctuation range taking 0 degrees, -120 degrees or 120 degrees as the reference, the wiring of the current detection equipment on the power grid side is judged not to be in phase opposition, and correspondingly, the phase C of the current detection equipment is connected with the phase C, the phase A or the phase B of the power grid; and if the phase angle difference value is within the error fluctuation range taking-180 degrees, 60 degrees or-60 degrees as the reference, judging the wiring phase of the current detection equipment on the power grid side, and correspondingly, connecting the C phase of the current detection equipment with the C phase, the A phase or the B phase of the power grid.
Preferably, the method further comprises: and displaying the analyzed wiring condition in real time.
The invention also discloses a current management device, which is provided with a current detection device on a line connected with the confluence point, a power grid connected with the current detection device and a load together is provided with a current detection device, and the current management device internally comprises a circuit for executing the method.
Preferably, the current harnessing apparatus is an inverter.
The invention also discloses a source side current transformer wiring detection system of the current governance equipment, which comprises the current governance equipment and two current detection equipment, wherein one current detection equipment is arranged on a line of the current governance equipment connected with a junction point, the other current detection equipment is arranged on a power grid to which the current detection equipment and a load are connected together, and the current governance equipment internally comprises a circuit for executing the method.
Preferably, the current governance device is an inverter, and the two current detection devices are two current transformers.
The source side current transformer wiring detection method, the source side current transformer wiring detection system and the current management equipment have the following beneficial effects: the current management equipment actively outputs current to one side of a power grid, then analyzes the phase angle of the current detected by the current detection equipment on the power grid side according to the first current detected by the current detection equipment on the power grid side and the second current detected by the current detection equipment from the current management equipment to a junction point, and analyzes the wiring condition of the current detection equipment on the power grid side according to the phase angle of the current detected by the current management equipment and the second current; furthermore, the current can be ensured to flow to the power grid side instead of the load side by sending harmonic waves, and the magnitude of the output current can be adjusted in real time according to the rated current of the current detection equipment, so that the sampling error of the collected power grid current is reduced; and the detection result is fed back in real time through display and control, so that the accuracy of the result is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only examples of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts:
FIG. 1 is a schematic diagram of the operation of a current harnessing apparatus;
fig. 2 is a flowchart of a source side current transformer wire detection method.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Exemplary embodiments of the invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The terms including ordinal numbers such as "first", "second", and the like used in the present specification may be used to describe various components, but the components are not limited by the terms. These terms are used only for the purpose of distinguishing one constituent element from other constituent elements. For example, a first component may be named a second component, and similarly, a second component may also be named a first component, without departing from the scope of the present invention.
The general idea of the invention is as follows: the current management equipment outputs current to one side of a power grid, first current detected by current detection equipment on the power grid side and second current detected by current detection equipment from the current management equipment to a junction point are obtained, then phase angles of the first current and the second current are analyzed, and the wiring condition of the current detection equipment on the power grid side is analyzed according to the phase angles of the first current and the second current.
In order to better understand the technical solutions, the technical solutions will be described in detail below with reference to the drawings and the specific embodiments of the specification, and it should be understood that the embodiments and specific features of the embodiments of the present invention are detailed descriptions of the technical solutions of the present application, and are not limited to the technical solutions of the present application, and the technical features of the embodiments and examples of the present invention may be combined with each other without conflict.
Referring to fig. 1, the current governance device is specifically an inverter, an active power filter, or a static var generator, and we take the example that the current governance device is specifically an inverter, and the current detection device is specifically a current transformer. The inverter is provided with a Current transformer CT (Current transformer) on a line connected to a junction point, which is a junction point of the inverter and the load, as shown by a point H in fig. 2. A current transformer CT is provided on the grid to which the inverter and the load are commonly connected. When the current management equipment normally operates, the corresponding reactive and harmonic currents are provided for the load, so that the power factor of the current on the power grid side, the indexes such as THDI and the like can meet the requirements of a power supply office.
When the current transformer CT is positioned at the side of a power grid, the output current of the inverter needs to be acquired in order to calculate the load current, because the current transformer CT of the output current is positioned in the cabinet body of the inverter, the wiring of the current transformer CT is easy to judge, the current transformer CT can be directly observed by naked eyes when the cabinet body is opened generally, and the current transformer CT at the side of the power grid is generally concealed outside the cabinet body and is not suitable for naked eye observation.
As shown in fig. 2, the method for detecting the wiring of the source side current transformer of the current governance device of the present invention includes:
s101: the current treatment equipment outputs current to one side of a power grid;
in order to ensure that the output current of the current governance equipment flows into one side of a power grid but not one side of a load, the current governance equipment outputs harmonic current with specific frequency, and the amplitude of the harmonic current can be adjusted according to the rated current of the current detection equipment on the side of the power grid, so that the amplitude of the output current cannot exceed the rated current amplitude of the current detection equipment on the side of the power grid.
Specifically, whether the output current of the inverter flows to the load side or the grid side depends mainly on what frequency of current is needed by the load current, and if the load side needs the current with the frequency of 50Hz at this time and the inverter outputs the current with the frequency of 50Hz exactly at this time, the output current of the inverter flows to the load side at this time, but not to the grid side. However, since the present invention needs to ensure that the output current of the inverter flows to the grid side, the output current of the inverter must not include the current of the corresponding frequency included in the load current, but must output a harmonic current of a specific frequency that the load current does not include.
S102: acquiring a first current detected by a current detection device on the power grid side and a second current detected by a current detection device from a current management device to a confluence point;
s103: analyzing phase angles of the first and second currents;
the phase angle can be analyzed based on the collected current, which is a well-known technique in the art and will not be described herein.
S104: and analyzing the wiring condition of the current detection equipment on the power grid side according to the phase angles of the two.
Specifically, firstly, a phase angle difference value of each phase of the second current and the first current is calculated; then judging whether the phase angle difference value is within an error fluctuation range taking any one of the following angles as a reference: 0 °, -120 °, -180 °, 60 °, -60 °, if yes, was substituted into table 1 to analyze the specific wiring condition.
TABLE 1
Specifically, with reference to table 1, we take phase a as an example, and if the phase angle difference is within the error fluctuation range with 0 °, -120 °, or 120 ° as a reference, it is determined that the wiring of the current detection device on the grid side is not inverted, and accordingly, phase a of the current detection device is connected to phase a, phase B, or phase C of the grid; and if the phase angle difference value is within the error fluctuation range taking-180 degrees, 60 degrees or-60 degrees as a reference, judging the wiring phase of the current detection equipment on the power grid side, and correspondingly, connecting the phase A of the current detection equipment with the phase A, the phase B or the phase C of the power grid.
Similarly, for phase B, if the phase angle difference is within the error fluctuation range taking 0 degrees, -120 degrees or 120 degrees as the reference, the wiring of the current detection equipment on the power grid side is judged not to be in reverse phase, and correspondingly, the phase B of the current detection equipment is connected with the phase B, C or A of the power grid; if the phase angle difference value is within an error fluctuation range taking-180 degrees, 60 degrees or-60 degrees as a reference, judging the wiring phase reversal of the current detection equipment on the power grid side, and correspondingly, connecting the phase B of the current detection equipment with the phase B, C or A of the power grid;
similarly, for the phase C, if the phase angle difference value is within the error fluctuation range taking 0 degrees, -120 degrees or 120 degrees as the reference, the wiring of the current detection equipment on the power grid side is judged not to be in phase reversal, and correspondingly, the phase C of the current detection equipment is connected with the phase C, A or B of the power grid; and if the phase angle difference value is within an error fluctuation range taking-180 degrees, 60 degrees or-60 degrees as a reference, judging that the wiring of the current detection equipment on the power grid side is in reverse phase, and correspondingly, connecting the C phase of the current detection equipment with the C phase, the A phase or the B phase of the power grid.
It is understood that the error fluctuation range of the reference means a range defined by subtracting an error threshold value from the reference and adding an error threshold value, for example, assuming that the error threshold value is 2 °, and that the error fluctuation range of the reference of-180 ° is from-182 ° to-178 °.
Preferably, the method further comprises: and displaying the analyzed wiring condition in real time.
The invention further claims a current governance device, wherein the current governance device is provided with a current detection device on a line connected with a confluence point, the current detection device and a load are connected with a power grid together, and the current governance device internally comprises a circuit for executing the method of the embodiment one. The current governance equipment is an inverter, an active power filter or a static var generator.
In another aspect, the present invention claims a source side current transformer wiring detection system of a current governance device, comprising a current governance device and two current detection devices, wherein one current detection device is arranged on a line of the current governance device connected to a junction point thereof, and the other current detection device is arranged on a power grid to which the current detection device and a load are connected together, and the current governance device internally comprises a circuit for executing the method of the first embodiment. The current management equipment is an inverter, an active power filter or a static var generator. The two current detection devices are two current transformers.
While the present invention has been described with reference to the particular illustrative embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but is intended to cover various modifications, equivalent arrangements, and equivalents thereof, which may be made by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. A source side current transformer wiring detection method of current governance equipment is characterized by comprising the following steps:
the current management equipment outputs current to one side of a power grid, and obtains first current detected by current detection equipment on the side of the power grid and second current detected by current detection equipment from the current management equipment to a confluence point;
analyzing phase angles of the first current and the second current, and analyzing the wiring condition of current detection equipment on the side of the power grid according to the phase angles of the first current and the second current;
wherein, current treatment equipment output current to electric wire netting one side, include: the current governance equipment outputs harmonic current with specific frequency, and the amplitude of the harmonic current is set according to the rated current of the current detection equipment on the power grid side, wherein the specific frequency is the frequency which does not contain the load current;
wherein, the wiring condition of the current detection equipment on the power grid side is analyzed according to the phase angle of the two, and the method comprises the following steps:
calculating a phase angle difference value of each phase of the second current and the first current;
for phase A, if the phase angle difference is within the error fluctuation range taking 0 degrees, -120 degrees or 120 degrees as a reference, the wiring of the current detection equipment on the power grid side is judged not to be in phase opposition, and correspondingly, the phase A of the current detection equipment is connected with the phase A, the phase B or the phase C of the power grid; if the phase angle difference value is in an error fluctuation range taking-180 degrees, 60 degrees or-60 degrees as a benchmark, judging the wiring phase of the current detection equipment on the side of the power grid, and correspondingly, connecting the phase A of the current detection equipment with the phase A, the phase B or the phase C of the power grid;
for the phase B, if the phase angle difference value is in the error fluctuation range taking 0 degrees, -120 degrees or 120 degrees as the benchmark, the wiring of the current detection equipment on the side of the power grid is judged not to be in reverse phase, and correspondingly, the phase B of the current detection equipment is connected with the phase B, the phase C or the phase A of the power grid; if the phase angle difference value is within an error fluctuation range taking-180 degrees, 60 degrees or-60 degrees as a reference, judging the wiring phase reversal of the current detection equipment on the power grid side, and correspondingly, connecting the phase B of the current detection equipment with the phase B, C or A of the power grid;
for the phase C, if the phase angle difference value is in the error fluctuation range taking 0 degrees, -120 degrees or 120 degrees as the benchmark, the connection of the current detection equipment on the side of the power grid is judged not to be in reverse phase, and correspondingly, the phase C of the current detection equipment is connected with the phase C, A or B of the power grid; and if the phase angle difference value is within an error fluctuation range taking-180 degrees, 60 degrees or-60 degrees as a reference, judging that the wiring of the current detection equipment on the power grid side is in reverse phase, and correspondingly, connecting the C phase of the current detection equipment with the C phase, the A phase or the B phase of the power grid.
2. The method of claim 1, further comprising: and displaying the analyzed wiring condition in real time.
3. A current harnessing device, wherein the current harnessing device is provided with a current sensing device on a line to which the current sensing device is connected to a junction, and wherein the current sensing device and a load are commonly connected to a grid, the current harnessing device comprising internally circuitry for performing a method according to any one of claims 1 to 2.
4. The current harnessing apparatus according to claim 3, wherein the current harnessing apparatus is an inverter.
5. A source side current transformer wiring detection system of a current governance device comprising a current governance device and two current detection devices, one of which is provided on a line of the current governance device at which it is connected to a sink point and the other of which is provided on a grid to which the current detection device and a load are commonly connected, the current governance device including internally circuitry for performing the method of any one of claims 1-2.
6. The system of claim 5, wherein the current harnessing device is an inverter and the two current sensing devices are two current transformers.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102095965A (en) * | 2009-12-15 | 2011-06-15 | 西安爱邦电气有限公司 | Method for analyzing wiring correctness of CT (current transformer) of two-winding conventional transformer multi-switch differential protection circuit |
| CN102095958A (en) * | 2009-12-15 | 2011-06-15 | 西安爱邦电气有限公司 | Method for analyzing wiring correctness of double-winding conventional transformer single-switch differential protection CT |
| CN102109564A (en) * | 2009-12-29 | 2011-06-29 | 西安爱邦电气有限公司 | Excitation current transformer connection information detection method |
| CN107422221A (en) * | 2017-09-04 | 2017-12-01 | 云南电网有限责任公司电力科学研究院 | On-line testing three-phase APF and primary current mutual inductor interstar connection a kind of method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5855070B2 (en) * | 2013-10-25 | 2016-02-09 | 三菱電機株式会社 | Measuring apparatus and current transformer installation state determination method |
| CN105911420B (en) * | 2016-05-30 | 2018-09-18 | 厦门大学嘉庚学院 | The method of 192 kinds of three-phase three-wire electric energy meter modes of connection of automatic discrimination |
| CN111398871A (en) * | 2020-04-07 | 2020-07-10 | 国家电网有限公司 | Device and method for checking polarity of zero sequence current transformer |
-
2021
- 2021-04-14 CN CN202110404106.8A patent/CN113325337B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102095965A (en) * | 2009-12-15 | 2011-06-15 | 西安爱邦电气有限公司 | Method for analyzing wiring correctness of CT (current transformer) of two-winding conventional transformer multi-switch differential protection circuit |
| CN102095958A (en) * | 2009-12-15 | 2011-06-15 | 西安爱邦电气有限公司 | Method for analyzing wiring correctness of double-winding conventional transformer single-switch differential protection CT |
| CN102109564A (en) * | 2009-12-29 | 2011-06-29 | 西安爱邦电气有限公司 | Excitation current transformer connection information detection method |
| CN107422221A (en) * | 2017-09-04 | 2017-12-01 | 云南电网有限责任公司电力科学研究院 | On-line testing three-phase APF and primary current mutual inductor interstar connection a kind of method |
Non-Patent Citations (1)
| Title |
|---|
| 基于相位角分析的交流采样错接线研究与实现;汪国华;《中国优秀博硕士学位论文全文数据库(硕士)工程科技Ⅱ辑》;20091215(第12期);C042-320正文第29-33页 * |
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