CN114137363A - Non-invasive AC/DC power flow direction detection device and judgment method - Google Patents
Non-invasive AC/DC power flow direction detection device and judgment method Download PDFInfo
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- CN114137363A CN114137363A CN202111482874.1A CN202111482874A CN114137363A CN 114137363 A CN114137363 A CN 114137363A CN 202111482874 A CN202111482874 A CN 202111482874A CN 114137363 A CN114137363 A CN 114137363A
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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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
- G01R1/0408—Test fixtures or contact fields; Connectors or connecting adaptors; Test clips; Test sockets
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
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- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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Abstract
The invention relates to a non-invasive AC/DC tide direction detection device and a judgment method, wherein the device comprises a sensor body and an acquisition and analysis unit, the sensor body comprises a current sensing unit and a voltage sensing unit and can sense current and voltage signals on a line conductor to be detected, the sensor body is in an annular structure with an inner side through hole, the line conductor to be detected extends into the inner side through hole during actual detection, and the method comprises the following steps: applying direct current to a detection device in advance for calibration; then, detecting the power flow direction in the line to be detected in real time by using the device, and judging the actual power flow direction of the direct current system according to the polarities of the voltage and current signals detected in real time; and for an alternating current system, judging the actual power flow direction according to the phase difference of the voltage signal waveform and the current signal waveform detected in real time. Compared with the prior art, the method can be applied to a direct current system and an alternating current system to judge the power flow direction of the line, and has the advantages of convenience in use, accurate and reliable detection result and the like.
Description
Technical Field
The invention relates to the technical field of power grid tidal current characteristic monitoring, in particular to a non-invasive AC/DC tidal current direction detection device and a non-invasive AC/DC tidal current direction judgment method.
Background
Power systems with access to a high percentage of renewable energy and power electronics are quite different from traditional power systems. The distributed photovoltaic system built by residents and industrial users in the novel power system can be used as a load and a power supply, so that the unidirectional power flow in the novel power system can be developed into a bidirectional power flow. In addition, in recent years, dc power distribution networks have been gradually popularized, and a large amount of dc power flows have appeared on the basis of ac power flows. In order to ensure the safety of the power system, monitoring the power flow characteristics of the power grid is an indispensable operation and maintenance means. The prior art lacks a sensing technology which can be widely applied to alternating current and direct current tide monitoring.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a non-invasive AC/DC power flow direction detection device and a non-invasive AC/DC power flow direction judgment method which can be widely applied to an AC/DC system.
The purpose of the invention can be realized by the following technical scheme:
a non-invasive AC/DC tidal current direction detection device 1 comprises a sensor body 101 and a collection and analysis unit 102, wherein the sensor body 101 comprises a current sensing unit 10101 and a voltage sensing unit 10102, the outer shell of the sensor body 101 is of an annular structure, the detection ends of the current sensing unit 10101 and the voltage sensing unit 10102 are of annular structures and are located in the outer shell, and the center of the outer shell is provided with an inner side through hole 103 used for extending into a line conductor 2;
the acquisition and analysis unit 102 acquires current and voltage signals according to the output results of the current sensing unit 10101 and the voltage sensing unit 10102, executes an alternating current/direct current power flow direction judgment method, and outputs a judgment result.
Further, the current sensing unit 10101 includes a magnetic core 1010101 with an air gap and a bipolar magnetoresistive sensing chip 1010102, the bipolar magnetoresistive sensing chip 1010102 is located in the air gap of the magnetic core 1010101, the bipolar magnetoresistive sensing chip 1010102 is connected to the acquisition and analysis unit 102, and the magnetic core 1010101 is an annular structure with an air gap.
Further, the voltage sensing unit 10102 includes a copper foil 1010201, a metal plate 1010202, an insulating pad 1010203, a metal housing 1010204 and an electric field sensor 1010205, the copper foil 1010201 is in a ring structure, the copper foil 1010201 is connected to the metal plate 1010202 through a metal wire, and the copper foil 1010201 is exposed out of the housing and used for contacting the line conductor 2 to be tested; the metal plate 1010202 and the metal housing 1010204 form an enclosed structure, and are electrically insulated by an insulating pad 1010203, and the electric field sensor 1010205 is located in an area enclosed by the enclosed structure and connected to the acquisition and analysis unit 102.
Further, the enclosed structure formed by the metal plate 1010202, the insulating pad 1010203 and the metal housing 1010204 is a cube or a cuboid.
Further, the acquisition and analysis unit 102 includes a processor 10201, an alarm unit 10202, a communication unit 10203, a current sensor signal interface unit 10204 and a voltage sensor signal interface unit 10205, the processor 10201 is respectively connected to the alarm unit 10202 and the communication unit 10203, the processor 10201 is connected to the current sensing unit 10101 through the current sensor signal interface unit 10204, and is connected to the voltage sensing unit 10102 through the voltage sensor signal interface unit 10205.
Further, the communication unit 10203 of the acquisition and analysis unit 102 is connected to a remote server.
The invention also provides a non-invasive AC/DC power flow direction judgment method, which comprises the following steps:
the method comprises the steps that direct current is applied to a detection device in advance for calibration, an output current signal is formed through magnetic flux sensing of the applied current, if the current signal is positive, the current direction at the moment is calibrated to be a positive direction, and otherwise, the reverse direction of the current direction at the moment is calibrated to be the positive direction;
when the tidal current direction is actually detected, for a line to be detected in a direct current system, if the polarities of the voltage and the current detected in real time are the same, the actual tidal current direction of the line is the same as the calibrated positive direction, and if the polarities of the voltage and the current detected in real time are opposite, the actual tidal current direction of the line is opposite to the calibrated positive direction;
for a line to be tested in an alternating current system, if the phase difference between the voltage waveform and the current waveform detected in real time is within 180 degrees, the actual tidal current direction of the line is the same as the positive direction of calibration, otherwise, the actual tidal current direction is opposite to the positive direction of calibration.
Further, when the detection device is calibrated in advance, if the current signal output by the current sensing unit of the detection device is positive, the current direction at the moment is calibrated to be a positive direction; and if the current signal output by the current sensing unit of the detection device is negative, calibrating the current direction at the moment to be a positive direction.
Further, for a line to be detected in the direct current system, if the voltage detected in real time is positive polarity and the current is positive polarity, the actual tidal current direction of the line is the same as the calibrated positive direction; if the real-time detected voltage is positive polarity and the current is negative polarity, the actual tidal current direction of the circuit is opposite to the calibrated positive direction; if the voltage detected in real time is negative polarity and the current is positive polarity, the actual tidal current direction of the line is opposite to the calibrated positive direction; if the voltage detected in real time is negative polarity and the current is negative polarity, the actual tidal current direction of the circuit is the same as the calibrated positive direction.
Further, the method further comprises: and after the actual tidal current direction of the line is judged, comparing the actual tidal current direction with the preset tidal current direction of the line plan, if the actual tidal current direction is consistent with the preset tidal current direction, outputting consistent result information, and if the actual tidal current direction is not consistent with the preset tidal current direction, outputting an alarm prompt or performing information feedback.
Compared with the prior art, the invention has the following advantages:
(1) the invention can be applied to a direct current system and an alternating current system to judge the power flow direction of a line; for a direct current system, the power flow direction of the system can be judged through the positive and negative polarity combinations of signals output by the voltage sensing unit and the current sensing unit; for an alternating current system, the power flow direction of the system can be judged through the phase relation of signals output by the voltage sensing unit and the current sensing unit, and the method has the advantages of convenience in calculation, accurate and reliable detection result and the like.
(2) The current sensing unit of the invention is used for sensing the magnetic flux of the current in the line conductor based on the magnetic core to obtain the detection current; the voltage sensing unit detects voltage through the constructed parallel electric field; realize on the whole that voltage and current's detection all can realize non-invasive measurement, convenient to use.
Drawings
Fig. 1 is a schematic usage state diagram of a non-invasive ac/dc power flow direction detection apparatus provided in an embodiment of the present invention;
fig. 2 is an external view schematically illustrating a non-invasive ac/dc power flow direction detecting apparatus according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a non-invasive ac/dc power flow direction detection apparatus provided in an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a current sensing unit of a non-invasive ac/dc power flow direction detection apparatus provided in an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a voltage sensing unit of a non-invasive ac/dc power flow direction detection apparatus according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an acquisition and analysis unit of a non-invasive ac/dc power flow direction detection apparatus provided in an embodiment of the present invention;
fig. 7 is a general schematic diagram of a non-invasive ac/dc power flow direction detection apparatus provided in an embodiment of the present invention;
in the figure, 1, a non-invasive alternating current-direct current tide direction detection device, 101, a sensor body, 10101, a current sensing unit, 10102, a voltage sensing unit, 1010101, a magnetic core, 1010102, a magnetic resistance bipolar sensing chip, 1010201, copper foil, 1010202, a metal plate, 1010203, an insulating cushion block, 1010204, a metal shell, 1010205, an electric field sensor, 102, an acquisition and analysis unit, 10201, a processor, 10202, an alarm unit, 10203, a communication unit, 10204, a current sensor signal interface unit, 10205, a voltage sensor signal interface unit, 2 and a line conductor.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
It should be noted that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
Example 1
As shown in fig. 1, the present embodiment firstly provides a non-invasive ac/dc power flow direction detecting apparatus 1, and a line conductor 2 passes through the non-invasive ac/dc power flow sensing apparatus 1.
As shown in fig. 2 and 3, the non-invasive ac/dc tidal current direction detection apparatus 1 includes a sensor body 101 and an acquisition and analysis unit 102, the sensor body 101 includes a current sensing unit 10101 and a voltage sensing unit 10102, an outer shell of the sensor body 101 is in an annular structure, detection ends of the current sensing unit 10101 and the voltage sensing unit 10102 are both in an annular structure and are located in the outer shell, and a center of the outer shell has an inner through hole 103 for passing through the line conductor 2;
the acquisition and analysis unit 102 acquires current and voltage signals according to output results of the current sensing unit 10101 and the voltage sensing unit 10102.
Specifically, as shown in fig. 4, the current sensing unit 10101 includes a magnetic core 1010101 with an air gap and a dual-polarity magnetoresistive sensing chip 1010102, the dual-polarity magnetoresistive sensing chip 1010102 is located in the air gap of the magnetic core 1010101, the dual-polarity magnetoresistive sensing chip 1010102 is connected to the acquisition and analysis unit 102, and the magnetic core 1010101 is a ring-shaped structure with an air gap.
As shown in fig. 5, the voltage sensing unit 10102 includes a copper foil 1010201, a metal plate 1010202, an insulating pad 1010203, a metal housing 1010204 and an electric field sensor 1010205, the copper foil 1010201 is a ring structure, the copper foil 1010201 is connected to the metal plate 1010202 through a metal wire, and the copper foil 1010201 is exposed out of the housing and used for contacting the line conductor 2 to be tested; the metal plate 1010202 forms an enclosed structure with the metal housing 1010204, and is electrically insulated by the insulating pad 1010203, and the electric field sensor 1010205 is located in the enclosed area of the enclosed structure and is connected to the collection and analysis unit 102.
In the present embodiment, the surrounding structure formed by the metal plate 1010202, the insulating block 1010203, and the metal case 1010204 is a rectangular parallelepiped, but the shape is not limited to a rectangular parallelepiped, and may be a regular shape such as a square.
As shown in fig. 6 and 7, the collecting and analyzing unit 102 includes a processor 10201, an alarm unit 10202, a communication unit 10203, a current sensor signal interface unit 10204 and a voltage sensor signal interface unit 10205, the processor 10201 is respectively connected to the alarm unit 10202 and the communication unit 10203, the processor 10201 is connected to the current sensing unit 10101 through the current sensor signal interface unit 10204, and is connected to the voltage sensing unit 10102 through the voltage sensor signal interface unit 10205.
Preferably, the communication unit 10203 of the collection and analysis unit 102 is connected to a remote server for facilitating data exchange remotely.
The non-invasive AC/DC tidal current direction detection device has the working principle that:
after the line conductor 2 passes through a non-invasive ac/dc power flow sensing device 1, current and voltage signals on the conductor are respectively detected by a current sensing unit 10101 and a voltage sensing unit 10102 of the sensor body 101, the current and voltage signals are transmitted to a collecting and analyzing unit 102, and then the collecting and analyzing unit 102 executes an ac/dc power flow direction judgment method and outputs a judgment result.
The current measurement principle is as follows: a conductor with current passes through the through hole 103 inside the detection device, then the current in the conductor generates a magnetic flux in the magnetic core 1010101 of the current sensing unit 10101, and after the magnetic flux is sensed by the magnetoresistive bipolar sensing chip 1010102 placed in the air gap of the magnetic core 1010101, a current signal is output and sent to the current sensor signal interface unit 10204.
Voltage measurement principle: copper foil 1010201 forms an equipotential when it comes into contact with the conductor, and copper foil 1010201 and metal plate 1010202 are connected by a wire to form an equipotential, so that the voltage of the conductor is the same as the voltage of metal plate 1010202. The metal plate 1010202 is electrically isolated from the metal housing 1010204 by insulating spacers 1010203. The metal plate 1010202 forms a parallel electric field with the metal housing 1010204, and the electric field sensor 1010205 located in the middle measures the electric field and outputs a voltage signal to the voltage sensor signal interface unit 10205.
The specific use and the tide direction judging method of the non-invasive AC/DC tide direction detecting device are as follows:
For the direct current system, if the current signal measured by the current sensing unit 10101 of the non-invasive ac/dc power flow detection device is positive, and the voltage signal obtained by the voltage sensing unit 10102 is positive, the actual power flow direction of the line is the same as the positive direction marked on the detection device in the step 1; if the current signal measured by the current sensing unit 10101 is negative polarity and the voltage signal obtained by the voltage sensing unit 10102 is positive polarity, the actual power flow direction of the line is opposite to the positive direction marked on the detection device in the step 1; if the current signal measured by the current sensing unit 10101 is positive and the voltage signal measured by the voltage sensing unit 10102 is negative, the actual power flow direction of the line is opposite to the positive direction marked on the detection device in the step 1; if the current signal measured by the current sensing unit 10101 is negative and the voltage signal obtained by the voltage sensing unit 10102 is negative, the actual power flow direction of the line is the same as the positive direction marked on the detection device in the step 1;
for an alternating current system, because the measured signal is a 50Hz sine waveform, the phase relation of the current and voltage signal waveforms is used for judging the power flow direction. If the phase difference between the voltage waveform and the current waveform is within 180 degrees, the current direction of the line is the same as the positive direction marked on the detection device in the step 1; if the voltage and current waveforms are out of phase by more than 180 degrees, the direction of the line current is opposite to the positive direction marked on the detection device in step 1.
And step 3: after the processor 10201 determines the line flow direction, if the line flow direction does not conform to the line planning requirement, the processor alarms through the alarm unit 10202 or notifies the remote server through the communication unit 10203.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. The non-invasive alternating current-direct current tide direction detection device is characterized by comprising a sensor body (101) and a collection and analysis unit (102), wherein the sensor body (101) comprises a current sensing unit (10101) and a voltage sensing unit (10102), the outer shell of the sensor body (101) is of an annular structure, the detection ends of the current sensing unit (10101) and the voltage sensing unit (10102) are of the annular structure and are located in the outer shell, and the center of the outer shell is provided with an inner side through hole (103) used for extending into a line conductor (2);
the acquisition and analysis unit (102) acquires current and voltage signals according to output results of the current sensing unit (10101) and the voltage sensing unit (10102), and therefore the alternating current/direct current tide direction is judged.
2. The non-invasive alternating current/direct current power flow direction detection device according to claim 1, wherein the current sensing unit (10101) comprises a magnetic core (1010101) with an air gap and a magnetic resistance bipolar sensing chip (1010102), the magnetic resistance bipolar sensing chip (1010102) is located in the air gap of the magnetic core (1010101), the magnetic resistance bipolar sensing chip (1010102) is connected with the collecting and analyzing unit (102), and the magnetic core (1010101) is of an annular structure with an air gap.
3. The non-invasive AC/DC tidal current direction detection device according to claim 1, wherein the voltage sensing unit (10102) comprises a copper foil (1010201), a metal plate (1010202), an insulating pad (1010203), a metal housing (1010204) and an electric field sensor (1010205), the copper foil (1010201) is of a ring structure, the copper foil (1010201) is connected with the metal plate (1010202) through a metal wire, and the copper foil (1010201) is exposed out of the housing and used for contacting with a line conductor (2) to be detected; the metal plate (1010202) and the metal shell (1010204) form a surrounding structure, and are electrically insulated by using insulating spacers (1010203), and the electric field sensor (1010205) is located in an area surrounded by the surrounding structure and is connected with the acquisition and analysis unit (102).
4. The non-invasive AC/DC power flow direction detecting device according to claim 3, wherein the enclosed structure formed by the metal plate (1010202), the insulating pad (1010203) and the metal housing (1010204) is a cube or a cuboid.
5. The non-invasive alternating current-direct current power flow direction detection device according to claim 1, wherein the acquisition and analysis unit (102) comprises a processor (10201), an alarm unit (10202), a communication unit (10203), a current sensor signal interface unit (10204) and a voltage sensor signal interface unit (10205), the processor (10201) is respectively connected with the alarm unit (10202) and the communication unit (10203), the processor (10201) is connected with the current sensing unit (10101) through the current sensor signal interface unit (10204), and is connected with the voltage sensing unit (10102) through the voltage sensor signal interface unit (10205).
6. The device as claimed in claim 5, wherein the communication unit (10203) of the collecting and analyzing unit (102) is connected to a remote server.
7. An alternating current/direct current power flow direction judging method based on the non-invasive alternating current/direct current power flow direction detecting device according to any one of claims 1 to 6, characterized by comprising the following steps:
the method comprises the steps that direct current is applied to a non-invasive AC/DC tide direction detection device in advance for calibration, a current signal is formed through magnetic flux sensing of the direct current, if an output signal is positive, the current direction at the moment is calibrated to be a positive direction, and otherwise, the reverse direction of the current direction at the moment is calibrated to be the positive direction;
for a line to be tested in a direct current system, if the polarities of the voltage and the current detected in real time are the same, the actual tidal current direction of the line is the same as the calibrated positive direction, and if the polarities of the voltage and the current detected in real time are opposite, the actual tidal current direction of the line is opposite to the calibrated positive direction;
for a line to be tested in an alternating current system, if the phase difference between the voltage waveform and the current waveform detected in real time is within 180 degrees, the actual tidal current direction of the line is the same as the positive direction of calibration, otherwise, the actual tidal current direction is opposite to the positive direction of calibration.
8. The method according to claim 7, wherein when the non-invasive ac/dc power flow direction detection device is calibrated in advance by using the direct current, if the output current signal of the non-invasive ac/dc power flow direction detection device is positive, the current direction at that time is calibrated to be a positive direction; and if the current signal output by the non-invasive AC/DC tidal current direction detection device is negative, calibrating the reverse direction of the current direction at the moment to be a positive direction.
9. The method of claim 7, wherein for the line under test in the DC system, if the real-time detected voltage is positive and the current is positive, the actual current flow direction of the line is the same as the calibrated positive direction; if the real-time detected voltage is positive polarity and the current is negative polarity, the actual tidal current direction of the circuit is opposite to the calibrated positive direction; if the voltage detected in real time is negative polarity and the current is positive polarity, the actual tidal current direction of the line is opposite to the calibrated positive direction; if the voltage detected in real time is negative polarity and the current is negative polarity, the actual tidal current direction of the circuit is the same as the calibrated positive direction.
10. The method of claim 7, further comprising: and after the actual tidal current direction of the line is judged, comparing the actual tidal current direction with the preset tidal current direction of the line plan, if the actual tidal current direction is consistent with the preset tidal current direction, outputting consistent result information, and if the actual tidal current direction is not consistent with the preset tidal current direction, outputting an alarm prompt or performing information feedback.
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| CN115524533A (en) * | 2022-10-25 | 2022-12-27 | 南方电网数字电网研究院有限公司 | Electrical quantity integrated measuring device and method |
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| CN115524533A (en) * | 2022-10-25 | 2022-12-27 | 南方电网数字电网研究院有限公司 | Electrical quantity integrated measuring device and method |
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