CN113917220A - Three-phase live display, cable line phase sequence monitoring and checking device and method - Google Patents
Three-phase live display, cable line phase sequence monitoring and checking device and method Download PDFInfo
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- G01R19/145—Indicating the presence of current or voltage
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R19/145—Indicating the presence of current or voltage
- G01R19/155—Indicating the presence of voltage
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The embodiment of the invention discloses a three-phase electrified display, a cable line phase sequence monitoring and checking device and a method. The three-phase charged display includes: the device comprises an induction electricity taking module, a phase sequence checking module, a phase sequence indicating module and a result display module. The induction power taking module is sleeved on the cable to be tested on two sides of the cable open loop point in a sleeving manner to obtain an electric signal of the cable to be tested; the phase sequence checking module is used for determining the phase sequence of each cable to be tested according to the electric signals and further checking the phase sequences of the cables to be tested at two sides of the cable open loop point; the phase sequence indicating module is used for indicating the phase sequence and the electrification condition of each cable to be detected according to the phase sequence determining result; and the result display module is used for displaying the phase sequence checking result. The embodiment of the invention can realize the phase sequence check of the cable line, accurately display the phase sequence and the electrified condition of the cable line, reduce the phase checking difficulty of the cable line, shorten the phase checking working time and improve the phase checking efficiency of the line.
Description
Technical Field
The embodiment of the invention relates to a power grid monitoring technology, in particular to a device and a method for monitoring and checking a phase sequence of a three-phase electrified display and a cable line.
Background
With the annual improvement of urbanization level, the cabling rate of overhead lines is continuously improved, and a ring power distribution network has become the mainstream direction of power distribution network construction. As important equipment and carriers for electric energy transmission, ring main units, cable distribution boxes, cables and the like are increasingly widely applied to power supply systems.
However, the number of devices such as ring main units and cable distribution boxes is large, the cable lines are generally long and have intermediate joints, and due to the fact that the qualities of constructors are different, the situation that the phase sequences of two ends of the cable intermediate joints do not correspond to each other sometimes occurs in the construction process. When the ac power supplies with different phases or phase sequences are operated in parallel or in a loop-closing manner, huge circulating currents are generated in the power grid, and the electrical equipment is easily damaged.
At present, the conventional cable line phase checking operation is realized based on a phase checking instrument and a three-phase live display. During cable installation or equipment acceptance, a phase checking instrument is required to be used for manual phase checking on newly-commissioned or modified cable lines. However, cable distribution boxes or ring network distribution stations are often located in underground spaces, and factors such as building structures and positions can cause shielding of wireless signals, so that the difficulty of manual phase checking is increased sharply, the working time is long, the phase checking efficiency is low, and wrong phase checking results are easily generated when communication is difficult. In addition, the three-phase live display of current cable distribution box and looped netowrk cabinet only can indicate whether the cable is electrified, can not accurately show or indicate cable line phase sequence, does not possess the nuclear phase function even more.
Disclosure of Invention
The embodiment of the invention provides a three-phase electrified display, a cable line phase sequence monitoring and checking device and a method, which are used for checking the phase sequence of a cable line, accurately displaying the phase sequence and the electrified condition of the cable line, reducing the phase checking difficulty of the cable line, shortening the phase checking working time and improving the line phase checking efficiency.
The embodiment of the first aspect of the invention provides a three-phase electrified display, which comprises an induction electricity taking module, a phase sequence checking module, a phase sequence indicating module and a result display module;
the induction power taking module is used for sleeving the cable to be tested on two sides of the cable open loop point in a sleeving manner to obtain an electric signal of the cable to be tested;
the phase sequence checking module is connected with the induction power taking module and used for determining the phase sequence of each cable to be tested according to the electric signals and further checking the phase sequences of the cables to be tested at two sides of the cable open loop point;
the phase sequence indicating module is connected with the phase sequence checking module and used for indicating the phase sequence and the electrified condition of each cable to be tested according to the phase sequence determining result;
and the result display module is connected with the phase sequence checking module and is used for displaying the phase sequence checking result.
Optionally, the electrical signal comprises a voltage signal and a current signal.
Optionally, the phase sequence checking module includes an acquisition chip, a signal processing unit, a phase sequence determining unit, an information transmitting unit, and a phase checking unit;
the input end of the acquisition chip is used as the input end of the phase sequence checking module, and the acquisition chip is used for extracting the voltage signal of each cable to be detected according to the electric signal;
the signal processing unit is connected with the acquisition chip and used for filtering the voltage signal according to a set signal processing rule to generate a filtered voltage signal;
the phase sequence determining unit is connected with the signal processing unit and the phase sequence indicating module and used for calculating the amplitude, the frequency and the phase of the filtering voltage signal according to the filtering voltage signal so as to determine the phase sequence of each cable to be tested;
the information transmission unit is connected between the phase sequence determination unit and the phase checking unit and used for transmitting a phase sequence determination result to the phase checking unit;
the output end of the phase checking unit is used as the output end of the phase sequence checking module, and the phase checking unit is used for checking the phase sequence of the cables to be tested on two sides of the cable open loop point according to the phase sequence determination result, the voltage signal and the current signal of each cable to be tested.
Optionally, the method further comprises:
and the wireless communication module is connected with the phase sequence checking module and is used for transmitting the phase sequence checking result and the electric signal to a display screen of the cable distribution box, which is adjacent to two sides of the cable open loop point.
Optionally, the number of the induction power taking modules includes: at least one of three or six.
Optionally, the phase sequence indication module includes: at least one of three or six tri-color LED indicator lights.
Optionally, the result display module comprises at least one of a CRT display screen, an LCD display screen, an LED display screen, or a plasma display screen.
Optionally, the phase sequence determining unit calculates the phase of the filtered voltage signal according to a zero-crossing detection method.
The embodiment of the second aspect of the invention provides a cable line phase sequence monitoring and checking device, which at least comprises display screens and a three-phase electrified display, wherein the display screens are arranged on two sides of a cable branching box, which are adjacent to a cable open loop point, and the three-phase electrified display is arranged according to any one of the embodiments of the invention.
The embodiment of the third aspect of the present invention provides a method for monitoring and identifying a phase sequence of a cable line, where the method is performed by a three-phase live-line display provided by the embodiment of the first aspect of the present invention, and the method includes:
acquiring an electric signal of the cable to be detected through the induction power taking module;
determining the phase sequence of each cable to be tested according to the electric signals through the phase sequence checking module, and further checking the phase sequence of the cables to be tested at two sides of the cable open loop point;
through the phase sequence indicating module, indicating the phase sequence and the electrification condition of each cable to be detected according to the phase sequence determination result;
and displaying the phase sequence checking result through the result display module.
According to the technical scheme provided by the embodiment of the invention, firstly, the electric signal of the cable to be tested is obtained through the induction electricity taking module which is sleeved on the cable to be tested on two sides of the cable open loop point; secondly, according to the electric signals, the phase sequence checking module can determine the phase sequence of each cable to be tested, and further check the phase sequences of the cables to be tested at two sides of the cable open loop point; and finally, according to the phase sequence determination result, the phase sequence indicating module indicates the phase sequence and the electrification condition of each cable to be tested, and meanwhile, the result display module displays the checking result according to the phase sequence. Therefore, compared with the prior art, the embodiment of the invention not only solves the defects that the existing three-phase electrified display can only indicate whether the cable is electrified, but can not accurately display or indicate the phase sequence of the cable line and has no phase checking function, but also overcomes the problems of high difficulty, long working time and low phase checking efficiency of an artificial phase checking method based on a phase checking instrument, realizes the phase sequence checking of the cable line, can accurately display the phase sequence and the electrified condition of the cable line, reduces the phase checking difficulty of the cable line, shortens the phase checking working time and is beneficial to improving the phase checking efficiency of the line.
Drawings
Fig. 1 is a schematic structural diagram of a three-phase charged display provided in an embodiment of the present invention;
FIG. 2 is a block diagram of a three-phase power-on display according to an embodiment of the present invention;
FIG. 3 is a block diagram of another three-phase power-on display according to an embodiment of the present invention
FIG. 4 is a schematic structural diagram of another three-phase charged display provided by an embodiment of the present invention;
fig. 5 is a flowchart of a method for monitoring and identifying a phase sequence of a cable line according to an embodiment of the present invention;
fig. 6 is a flowchart of another method for monitoring and identifying phase sequence of cable lines according to an embodiment of the present invention;
fig. 7 is a flowchart of another method for monitoring and identifying a phase sequence of a cable line according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a schematic structural diagram of a three-phase charged display according to an embodiment of the present invention. As shown in fig. 1, the three-phase charged display includes an induction power taking module 110, a phase sequence checking module 120, a phase sequence indicating module 130, and a result display module 140.
And the induction electricity taking module 110 is used for looping the cable to be tested on two sides of the cable open loop point to obtain an electric signal of the cable to be tested.
And the phase sequence checking module 120 is connected to the induction power taking module 110, and is configured to determine a phase sequence of each cable to be tested according to the electrical signal, so as to check the phase sequences of the cables to be tested on two sides of the cable open loop point.
And the phase sequence indicating module 130 is connected to the phase sequence checking module 120, and is configured to indicate the phase sequence and the charging condition of each cable to be tested according to the phase sequence determination result.
And a result display module 140, connected to the phase sequence checking module 120, for displaying the phase sequence checking result.
The cable to be tested is each of the three-phase cables positioned on two sides of the cable open loop point. It can be known that, since the three-phase cables on each side of the cable opening point include 3 cables to be tested, the total number of the cables to be tested is 6. Based on this, optionally, the number of the induction power taking modules 110 includes at least one of three or six. When the number of the induction power taking modules 110 is three, the three-phase electrified display needs to perform two measurements to obtain electric signals of three-phase cables on two sides of the cable open loop point; when the number of the induction power-taking modules 110 is six, the three-phase electrified display only needs to measure once, and then electric signals of three-phase cables on two sides of the cable open loop point can be acquired. Furthermore, it is understood that the electrical signal of the cable under test refers to an electrical signal capable of characterizing a characteristic parameter of the cable under test, optionally the electrical signal comprises a voltage signal and a current signal.
As can be seen, the phase sequence refers to the sequence of voltage signals of each phase in the three-phase cable passing through the same value. It can be understood that, since the three-phase cables each include an a phase, a B phase, and a C phase, where the B phase lags behind the a phase by 120 degrees and the C phase lags behind the B phase by 120 degrees, determining the phase sequence of each cable to be tested means that each cable to be tested is correspondingly determined to be the a phase, the B phase, or the C phase. Therefore, after the phase sequence of each cable to be tested is determined, the phase sequence of the cables to be tested on two sides of the cable open loop point can be checked. For example, assuming that the phase sequence of the cable to be tested on either side of the cable open-loop point is a1 phase, B1 phase or C1 phase, and the phase sequence of the cable to be tested on the other side of the cable open-loop point is a2 phase, B2 phase or C2 phase, checking the phase sequence of the cable to be tested on both sides of the cable open-loop point refers to checking whether the cable to be tested on both sides of the cable open-loop point is a1 phase opposite to a2 phase, B1 phase opposite to B2 phase, and C1 phase opposite to C2 phase.
As can be seen, the phase sequence determination result refers to the determination result of the phase sequence of each cable to be tested. Optionally, the phase sequence indicating module 130 includes at least one of three or six tri-color LED indicator lights. It can be understood that the number of the induction power-taking modules 110 corresponds to the number of the three-color LED indicator lamps included in the phase sequence indicating module 130. Illustratively, when the number of the induction power taking modules 110 is three, the phase sequence indicating module 130 includes three-color LED indicator lamps; when the number of the induction power-taking modules 110 is six, the phase sequence indicating module 130 includes six three-color LED indicator lamps.
Therefore, only when the cable to be tested has operating voltage, the three-color LED indicator lamp can be lightened so as to visually display that the cable to be tested is in a charged operating state, namely, the charged condition of each cable to be tested is indicated. Illustratively, a three-color LED indicator may emit yellow, green, and red light continuously or intermittently at a set frequency. The three-color LED indicator lamp emits yellow light, which can indicate that the phase sequence of the cable to be tested corresponding to the three-color LED indicator lamp emitting yellow light is phase A; the three-color LED indicator lamp emits green light, which can indicate that the phase sequence of the cable to be tested corresponding to the three-color LED indicator lamp emitting the green light is phase B; the tricolor LED pilot lamp glows, can explain that the phase sequence that sends the cable that awaits measuring that the tricolor LED pilot lamp of ruddiness corresponds is C looks. In summary, according to the present embodiment, the phase sequence and the electrification condition of each cable to be tested can be accurately indicated by the phase sequence indication module 130 according to the phase sequence determination result, which is beneficial to improving the accuracy of the phase verification of the cable to be tested.
Therefore, the phase sequence checking result is used for representing the phase sequence corresponding relation of the cables to be detected on two sides of the cable open loop point. For example, assuming that the phase sequence of the cable to be tested on either side of the cable open-loop point is a1 phase, B1 phase or C1 phase, and the phase sequence of the cable to be tested on the other side of the cable open-loop point is a2 phase, B2 phase or C2 phase, the phase sequence check result indicates whether the cable to be tested on both sides of the cable open-loop point is a1 phase opposite to a2 phase, B1 phase opposite to B2 phase, and C1 phase opposite to C2 phase. Optionally, the results display module 140 includes at least one of a CRT display screen, an LCD display screen, an LED display screen, or a plasma display screen. Illustratively, the LCD display screen may display the phase sequence check result in a combined display form of characters, symbols, letters, or the like, for example, a1 phase is opposite to a2 phase by "a 1-a2 v", and B1 phase is not opposite to B2 by "B1-B2 x".
Exemplarily, fig. 2 is a block diagram of a three-phase live display provided in an embodiment of the present invention, and fig. 3 is a block diagram of another three-phase live display provided in an embodiment of the present invention. Referring to fig. 2 and 3, it can be known that, when the number of the induction power taking modules 110 is 3, the number of the phase sequence indicating modules 130 and the number of the result displaying modules 140 are both 3; when the number of the induction power-taking modules 110 is 6, the number of the phase sequence indicating modules 130 and the number of the result displaying modules 140 are both 6.
In the embodiment of the invention, firstly, the electric signal of the cable to be tested is obtained through the induction electricity taking module 110 which is sleeved on the cable to be tested on two sides of the cable open loop point; secondly, according to the electrical signal, the phase sequence checking module 120 can determine the phase sequence of each cable to be tested, and further check the phase sequences of the cables to be tested on both sides of the cable open loop point; finally, according to the phase sequence determination result, the phase sequence indicating module 130 indicates the phase sequence and the electrification condition of each cable to be tested, and meanwhile, the result display module 140 displays the phase sequence checking result. Based on the above, compared with the prior art, the embodiment of the invention not only solves the defects that the existing three-phase electrified display can only indicate whether the cable is electrified, but can not accurately display or indicate the phase sequence of the cable line, and has no phase checking function, but also overcomes the problems of high difficulty, long working time, low phase checking precision and low efficiency of an artificial phase checking method based on a phase checking instrument, effectively reduces the phase checking difficulty of the cable line on the basis of realizing the phase sequence checking of the cable line and accurately displaying the phase sequence and the electrified condition of the cable line, shortens the phase checking working time, and is beneficial to improving the phase checking efficiency of the line.
On the basis of the above embodiments, fig. 4 is a schematic structural diagram of another three-phase charged display provided in the embodiments of the present invention. As shown in fig. 4, optionally, the phase sequence checking module 120 includes an acquisition chip 121, a signal processing unit 122, a phase sequence determining unit 123, an information transmitting unit 124, and a phase checking unit 125.
The input end of the acquisition chip 121 serves as the input end of the phase sequence checking module 120, and the acquisition chip 121 is configured to extract a voltage signal of each cable to be tested according to the electrical signal. And the signal processing unit 122 is connected to the acquisition chip 121, and is configured to filter the voltage signal according to a set signal processing rule, so as to generate a filtered voltage signal. And the phase sequence determining unit 123 is connected to the signal processing unit 122 and the phase sequence indicating module 130, and is configured to calculate an amplitude, a frequency, and a phase of the filtered voltage signal according to the filtered voltage signal, so as to determine a phase sequence of each cable to be tested. And the information transmission unit 124 is connected between the phase sequence determination unit 123 and the phase checking unit 125, and is used for transmitting the phase sequence determination result to the phase checking unit 125. The output end of the phase checking unit 125 serves as the output end of the phase sequence checking module 120, and the phase checking unit 125 is configured to check the phase sequence of the cables to be tested on both sides of the cable open loop point according to the phase sequence determination result, the voltage signal and the current signal of each cable to be tested.
The acquisition chip 121 may be any acquisition chip 121 that can be used to extract a cable voltage. It is understood that the acquisition chip 121 may be implemented by any voltage acquisition circuit to extract the voltage signal of each cable to be tested.
It is understood that the signal processing unit 122 can be, but is not limited to, a signal processing software, a single chip, a microprocessor, a system on a chip, or the like. It can be known that the signal processing rules can be written into the signal processing unit 122, thereby realizing the filtering of the voltage signal of the cable to be tested. The setting mode of the signal processing rule can be the initial setting of the three-phase electrified display or the autonomous setting of a constructor. For example, the present embodiment may perform digital filtering on the voltage signal extracted by the acquisition chip 121 via signal processing software to remove potential noise interference of the voltage signal and generate a filtered voltage signal with low noise interference. Based on this, this embodiment can further promote the phase sequence determination accuracy of three-phase electrified display, is favorable to improving the nuclear phase precision of three-phase electrified display.
As described above, in the three-phase cable, phase B is retarded by 120 degrees from phase a, and phase C is retarded by 120 degrees from phase B. Therefore, according to the low-noise disturbed filtering voltage signal and the amplitude, the frequency and the phase of the filtering voltage signal calculated by the phase sequence determining unit 123, the phase sequence determining unit 123 can further determine whether each cable to be tested is a phase a, a phase B or a phase C, that is, can generate a phase sequence determination result. It can be understood that when the number of the induction power taking modules 110 is three, the phase sequence determining unit 123 needs to determine the phase sequence of the cable to be tested at each side of the cable open loop point in two times, for example, the a1 phase, the B1 phase and the C1 phase can be determined for the first time, and the a2 phase, the B2 phase and the C2 phase can be determined for the second time; when the number of the induction power-taking modules 110 is six, the phase sequence determining unit 123 may determine the phase sequence of the cable to be tested at two sides of the cable open loop point at one time, that is, the a1 phase, the B1 phase, the C1 phase, the a2 phase, the B2 phase, and the C2 phase.
Alternatively, the phase sequence determination unit 123 calculates the phase of the filtered voltage signal according to a zero-crossing detection method. It can be understood that the basic principle of the zero-crossing detection method is to detect the time difference of multiple zero-crossing points of the same-frequency signal, and then convert the time difference into a phase difference.
It is understood that the information transfer unit 124 may be, but is not limited to, a BNC or a twisted pair cable. Illustratively, the information transfer unit 124 may preferably employ an optical fiber.
It is understood that, according to the phase sequence determination result generated by the phase sequence determining unit 123 and the electrical signal of the cable under test, the nuclear phase unit 125 can confirm whether the cables under test on both sides of the cable open loop point are a1 phase opposite to a2 phase, B1 phase opposite to B2 phase, and C1 phase opposite to C2 phase.
Based on this, in the present embodiment, the voltage signal of each cable to be tested is extracted according to the electrical signal through the acquisition chip 121; according to the set signal processing rule, the signal processing unit 122 filters the voltage signal to generate a filtered voltage signal; according to the filtering voltage signal, the phase sequence determining unit 123 calculates the amplitude, the frequency and the phase of the filtering voltage signal, so as to determine the phase sequence of each cable to be tested, further improve the phase sequence determining precision of the three-phase electrified display, and facilitate improving the phase checking precision of the three-phase electrified display; transmitting the result of the order determination to the phase checking unit 125 through the information transfer unit 124; according to the phase sequence determination result, the voltage signal and the current signal of each cable to be detected, the phase checking unit 125 checks the phase sequence of the cable to be detected on two sides of the cable open loop point, and effectively overcomes the defect that the existing three-phase electrified display can only indicate whether the cable is electrified, can not accurately display or indicate the phase sequence of a cable line, and does not have the phase checking function.
Optionally, the method further comprises:
and the wireless communication module 150 is connected with the phase sequence checking module 120 and is used for transmitting the phase sequence checking result and the electric signal to display screens at two sides of the cable branching box, which are adjacent to the cable looping point.
The wireless communication module 150 may be, but is not limited to, any microwave communication or satellite communication system. It is understood that the display screen may be, but is not limited to, a CRT display screen, an LCD display screen, an LED display screen, a plasma display screen, or the like. It can be understood that, through wireless communication module 150, this embodiment can be with phase sequence check result and signal of telecommunication transmission to the cable distribution box near the cable on the display screen of the cable looping point both sides, set up like this and can make the operating personnel of cable distribution box department learn the phase sequence through the display screen in real time and check the result to and the voltage and the electric current condition in the cable that awaits measuring, be favorable to shortening nuclear phase duration of operation, improve cable run nuclear phase efficiency.
The embodiment of the invention also provides a cable line phase sequence monitoring and identifying device which at least comprises display screens of the cable distribution box, which are adjacent to two sides of the cable open loop point, and the three-phase electrified display provided by any embodiment of the invention.
Fig. 5 is a flowchart of a method for monitoring and identifying a phase sequence of a cable line according to an embodiment of the present invention. The embodiment can be suitable for the scenes of real-time phase sequence monitoring and charged state identification of various types of cable lines, the method can be executed by the three-phase charged display in the embodiment of the invention, and the device can be realized by software and/or hardware. As shown in fig. 5, the method specifically includes the following steps:
s310, acquiring an electric signal of the cable to be detected through the induction power taking module.
And S320, determining the phase sequence of each cable to be detected according to the electric signals through the phase sequence checking module, and further checking the phase sequences of the cables to be detected on two sides of the cable open loop point.
And S330, indicating the phase sequence and the electrification condition of each cable to be detected through the phase sequence indicating module according to the phase sequence determination result.
And S340, displaying the phase sequence checking result through a result display module.
Optionally, the electrical signal comprises a voltage signal and a current signal.
Optionally, the number of the induction power taking modules includes at least one of three or six.
Optionally, the phase sequence indicating module comprises at least one of three or six tri-color LED indicator lights.
Optionally, the results display module includes at least one of a CRT display screen, an LCD display screen, an LED display screen, or a plasma display screen.
In summary, in the technical scheme provided by the embodiment of the present invention, firstly, the electric signal of the cable to be tested is obtained through the induction power-taking module sleeved on the cable to be tested on both sides of the cable open loop point; secondly, according to the electric signals, the phase sequence checking module can determine the phase sequence of each cable to be tested, and further check the phase sequences of the cables to be tested at two sides of the cable open loop point; and finally, according to the phase sequence determination result, the phase sequence indicating module indicates the phase sequence and the electrification condition of each cable to be tested, and meanwhile, the result display module displays the checking result according to the phase sequence. Based on the above, compared with the prior art, the embodiment of the invention not only solves the defects that the existing three-phase electrified display can only indicate whether the cable is electrified, but can not accurately display or indicate the phase sequence of the cable line, and has no phase checking function, but also overcomes the problems of high difficulty, long working time, low phase checking precision and low efficiency of an artificial phase checking method based on a phase checking instrument, effectively reduces the phase checking difficulty of the cable line on the basis of realizing the phase sequence checking of the cable line and accurately displaying the phase sequence and the electrified condition of the cable line, shortens the phase checking working time, and is beneficial to improving the phase checking efficiency of the line.
Fig. 6 is a flowchart of another method for monitoring and identifying a phase sequence of a cable line according to an embodiment of the present invention.
As shown in fig. 6, the method specifically includes the following steps:
s410, acquiring an electric signal of the cable to be detected through the induction power taking module.
And S420, extracting the voltage signal of each cable to be detected according to the electric signal through the acquisition chip.
And S430, filtering the voltage signal through the signal processing unit according to the set signal processing rule to generate a filtered voltage signal.
S440, calculating the amplitude, the frequency and the phase of the filtering voltage signal according to the filtering voltage signal through a phase sequence determining unit, and further determining the phase sequence of each cable to be tested.
Wherein, optionally, the phase sequence determination unit calculates the phase of the filtered voltage signal according to a zero-crossing detection method.
And S450, transmitting the phase sequence determination result to a nuclear phase unit through an information transmission unit.
And S460, checking the phase sequence of the cables to be tested on two sides of the cable open loop point through the phase checking unit according to the phase sequence determination result, the voltage signal and the current signal of each cable to be tested.
And S470, indicating the phase sequence and the electrification condition of each cable to be detected through the phase sequence indicating module according to the phase sequence determination result.
And S480, displaying the phase sequence checking result through a result display module.
Based on the above embodiment, in the embodiment of the invention, the voltage signal of each cable to be tested is extracted according to the electric signal by arranging the acquisition chip; filtering the voltage signal through a signal processing unit according to a set signal processing rule to generate a filtered voltage signal; through the phase sequence determining unit, the amplitude, the frequency and the phase of the filtering voltage signal are calculated according to the filtering voltage signal, and then the means of determining the phase sequence of each cable to be tested is adopted, so that the adverse effect of external environment noise on the voltage signal of each cable to be tested is effectively inhibited, the accuracy of determining the phase sequence of the cable to be tested is further enhanced, and the phase sequence checking of a cable line and the accurate display of the phase sequence and the electrified condition of the cable line are facilitated.
Fig. 7 is a flowchart of another method for monitoring and identifying a phase sequence of a cable line according to an embodiment of the present invention.
As shown in fig. 7, the method specifically includes the following steps:
s510, acquiring an electric signal of the cable to be detected through the induction power taking module.
And S520, extracting the voltage signal of each cable to be detected according to the electric signals through the acquisition chip.
And S530, filtering the voltage signal through the signal processing unit according to a set signal processing rule to generate a filtered voltage signal.
And S540, calculating the amplitude, the frequency and the phase of the filtering voltage signal according to the filtering voltage signal through a phase sequence determining unit, and further determining the phase sequence of each cable to be tested.
And S550, transmitting the phase sequence determination result to a phase checking unit through an information transmission unit.
And S560, checking the phase sequence of the cables to be tested at two sides of the cable open loop point through the phase checking unit according to the phase sequence determination result, the voltage signal and the current signal of each cable to be tested.
And S570, indicating the phase sequence and the electrification condition of each cable to be detected through the phase sequence indicating module according to the phase sequence determination result.
And S580, displaying the phase sequence checking result through a result display module.
And S590, transmitting the phase sequence checking result and the electric signal to display screens on two sides of the cable branching box adjacent to the cable open loop point through the wireless communication module.
Based on the above embodiment, the embodiment of the invention transmits the phase sequence checking result and the electric signal to the display screens of the cable distribution box adjacent to the two sides of the cable open loop point by arranging the wireless communication module, so that an operator at the cable distribution box can know the phase sequence checking result and the voltage and current conditions in the cable to be tested through the display screens, thereby being beneficial to shortening the phase checking working time and improving the phase checking efficiency of a cable line.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A three-phase electrified display is characterized by comprising an induction electricity taking module, a phase sequence checking module, a phase sequence indicating module and a result display module;
the induction power taking module is used for sleeving the cable to be tested on two sides of the cable open loop point in a sleeving manner to obtain an electric signal of the cable to be tested;
the phase sequence checking module is connected with the induction power taking module and used for determining the phase sequence of each cable to be tested according to the electric signals and further checking the phase sequences of the cables to be tested at two sides of the cable open loop point;
the phase sequence indicating module is connected with the phase sequence checking module and used for indicating the phase sequence and the electrified condition of each cable to be tested according to the phase sequence determining result;
and the result display module is connected with the phase sequence checking module and is used for displaying the phase sequence checking result.
2. The three-phase live display of claim 1, wherein the electrical signals comprise voltage signals and current signals.
3. The three-phase charged display device according to claim 2, wherein the phase sequence checking module comprises an acquisition chip, a signal processing unit, a phase sequence determining unit, an information transmitting unit and a phase checking unit;
the input end of the acquisition chip is used as the input end of the phase sequence checking module, and the acquisition chip is used for extracting the voltage signal of each cable to be detected according to the electric signal;
the signal processing unit is connected with the acquisition chip and used for filtering the voltage signal according to a set signal processing rule to generate a filtered voltage signal;
the phase sequence determining unit is connected with the signal processing unit and the phase sequence indicating module and used for calculating the amplitude, the frequency and the phase of the filtering voltage signal according to the filtering voltage signal so as to determine the phase sequence of each cable to be tested;
the information transmission unit is connected between the phase sequence determination unit and the phase checking unit and used for transmitting a phase sequence determination result to the phase checking unit;
the output end of the phase checking unit is used as the output end of the phase sequence checking module, and the phase checking unit is used for checking the phase sequence of the cables to be tested on two sides of the cable open loop point according to the phase sequence determination result, the voltage signal and the current signal of each cable to be tested.
4. The three-phase charged display of claim 1, further comprising:
and the wireless communication module is connected with the phase sequence checking module and is used for transmitting the phase sequence checking result and the electric signal to a display screen of the cable distribution box, which is adjacent to two sides of the cable open loop point.
5. The three-phase live display of claim 1, wherein the number of the induction power taking modules comprises: at least one of three or six.
6. The three-phase live display of claim 1, wherein the phase sequence indicating module comprises: at least one of three or six tri-color LED indicator lights.
7. The three-phase charged display of claim 5, wherein the results display module comprises at least one of a CRT display screen, an LCD display screen, an LED display screen, or a plasma display screen.
8. The three-phase live display of claim 1, wherein the phase sequence determining unit calculates the phase of the filtered voltage signal according to a zero-crossing detection method.
9. A cable run phase sequence monitoring and identification device comprising at least a display screen on each side of the cable distribution box adjacent to a cable loop opening point and a three-phase live display according to any one of claims 1 to 8.
10. A method for monitoring and identifying the phase sequence of a cable line, wherein the method is performed by using the three-phase live display of claim 1, and comprises the following steps:
acquiring an electric signal of the cable to be detected through the induction power taking module;
determining the phase sequence of each cable to be tested according to the electric signals through the phase sequence checking module, and further checking the phase sequence of the cables to be tested at two sides of the cable open loop point;
through the phase sequence indicating module, indicating the phase sequence and the electrification condition of each cable to be detected according to the phase sequence determination result;
and displaying the phase sequence checking result through the result display module.
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