CN115453181A - Coaxial cable circulation detection method, device and system - Google Patents
Coaxial cable circulation detection method, device and system Download PDFInfo
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- CN115453181A CN115453181A CN202211176718.7A CN202211176718A CN115453181A CN 115453181 A CN115453181 A CN 115453181A CN 202211176718 A CN202211176718 A CN 202211176718A CN 115453181 A CN115453181 A CN 115453181A
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Abstract
The invention discloses a coaxial cable circulation detection method, a device and a system, wherein the detection method is realized based on a three-phase cross-connection grounding system, and comprises the following steps: firstly, respectively acquiring a first same-axis cable circulation, a second-phase coaxial cable circulation and a third-phase coaxial cable circulation; and then establishing an equation relation according to the three-phase coaxial cable circulation and the circulation flow direction of each loop in the three-phase coaxial cable, and calculating the single loop circulation according to the equation relation. Therefore, the current of each loop of each cross interconnection metal sheath in the cross interconnection grounding system can be accurately, efficiently, low in labor force and high in safety and measured in real time, the current of the grounding wires of the first loop, the second loop and the third loop of the coaxial cable of the cross interconnection grounding system can be obtained, and whether the cross interconnection grounding system is abnormal or not can be judged to a certain extent more easily.
Description
Technical Field
The invention relates to the technical field of power grid circulation detection, in particular to a coaxial cable circulation detection method, device and system.
Background
The cross interconnection grounding method of the cable metal sheath is that the tail of the phase A is connected with the head of the phase B, the tail of the phase B is connected with the head of the phase C, and the tail of the phase C is connected with the head of the phase A. The shielding layer of the high-voltage single-core cable is grounded, and when the length is longer, a cross interconnection method is often adopted. Therefore, the induced current of the cable core wire current to the shielding layer can be mutually offset, the induced voltage of the metal sheath is controlled, the annular current on the sheath is reduced or eliminated, the transmission capacity of the cable is improved, the outer sheath of the cable is prevented from being punctured, and the safe operation of the cable is ensured.
At present, the common single-core current transformer is also used for carrying out circulating current monitoring on a cross interconnection system in a circulating current monitoring mode, but due to the coaxial structure of a coaxial cable, the circulating current monitoring result is the sum of the circulating current values of a first loop and a second loop of a cross interconnection system, even if manual field measurement is carried out, the circulating current value measured by a clamp meter is still the sum of the circulating current values of the two circulating loops, and the circulating current value is the circulating current value of each loop unless a grounding box is opened to measure the internal connecting piece of the cross interconnection box by the clamp meter. Therefore, the numerical value of the specific circulating current of each loop of the cross-interconnected section in the cross-interconnected grounding system cannot be known accurately under the conditions of high efficiency, convenience and manpower and material resource saving at present. And accurately acquiring the numerical value of the specific circulating current of each loop plays an important role in judging whether each loop has a fault or not in time and the like.
Disclosure of Invention
The invention provides a coaxial cable circulating current detection method, a coaxial cable circulating current detection device and a coaxial cable circulating current detection system, which are used for solving the problem that the circulating current in a single loop cannot be directly acquired in the related technology.
In order to solve the above technical problem, an embodiment of the present invention provides a coaxial cable circulating current detection method, where the detection method is implemented based on a three-phase cross-connected grounding system, and the detection method includes:
respectively acquiring first coaxial cable circulation, second coaxial cable circulation and third coaxial cable circulation;
and establishing an equation relation according to the three-phase coaxial cable circulation and the circulation flow direction of each loop in the three-phase coaxial cable, and calculating the single loop circulation according to the equation relation.
According to an embodiment of the present invention, in the three-phase cross-interconnected grounding system, the head of the first phase is connected to the tail of the second phase, the head of the second phase is connected to the tail of the third phase, and the head of the third phase is connected to the tail of the first phase;
the establishing of an equation relation according to the three-phase coaxial cable circulation and the circulation flow direction of each loop in the three-phase coaxial cable comprises the following steps of:
the first same-axis cable circulation flow is the sum of the inflow first loop circulation flow and the outflow third loop circulation flow; the second-phase coaxial cable circulation is the sum of the inflow second loop circulation and the outflow first loop circulation; the third-phase coaxial cable circulating current is the sum of the inflowing third loop circulating current and the outflowing second loop circulating current; establishing a first equation relationship;
or the first same-axis cable circulating current is the sum of the inflowing third circuit circulating current and the outflowing second circuit circulating current; the second-phase coaxial cable circulating current is the sum of the inflow first-loop circulating current and the outflow third-loop circulating current; the third-phase coaxial cable circulating current is the sum of the inflowing second loop circulating current and the outflowing first loop circulating current; establishing a second equation relation;
or the first same-axis cable circulating current is the sum of the inflowing second loop circulating current and the outflowing first loop circulating current; the second-phase coaxial cable circulating current is the sum of the inflowing third loop circulating current and the outflowing second loop circulating current; the third-phase coaxial cable circulation current is the sum of the inflow first loop circulation current and the outflow third loop circulation current; establishing a third program relation;
and calculating the first loop circulation, the second loop circulation and the third loop circulation according to one equation relation of the first equation relation, the second equation relation or the third equation relation.
According to an embodiment of the present invention, in the three-phase cross-interconnected grounding system, the head of the first phase is connected to the tail of the third phase, the head of the second phase is connected to the tail of the first phase, and the head of the third phase is connected to the tail of the second phase;
the establishing of an equation relation according to the three-phase coaxial cable circulation and the circulation flow direction of each loop in the three-phase coaxial cable comprises the following steps of:
the first same-axis cable circulation flow is the sum of the inflow first loop circulation flow and the outflow second loop circulation flow; the second-phase coaxial cable circulating current is the sum of the inflowing second loop circulating current and the outflowing third loop circulating current; the third-phase coaxial cable circulation current is the sum of the inflow third loop circulation current and the outflow first loop circulation current; establishing a first equation relationship;
or the first same-axis cable circulating current is the sum of the inflow second loop circulating current and the outflow third loop circulating current; the second-phase coaxial cable circulation current is the sum of the inflow third loop circulation current and the outflow first loop circulation current; the third-phase coaxial cable circulation current is the sum of the inflow first loop circulation current and the outflow second loop circulation current; establishing a second equation relation;
or the first same-axis cable circulating current is the sum of the inflowing third loop circulating current and the outflowing first loop circulating current; the second-phase coaxial cable circulation flow is the sum of the inflow first loop circulation flow and the outflow second loop circulation flow; the third-phase coaxial cable circulating current is the sum of the inflowing second loop circulating current and the outflowing third loop circulating current; establishing a third program relation;
and calculating the first loop circulation, the second loop circulation and the third loop circulation according to one equation relation of the first equation relation, the second equation relation or the third equation relation.
According to an embodiment of the present invention, the first phase is an a-phase, the second phase is a B-phase, and the third phase is a C-phase, the first loop circulation is an a-phase loop circulation, the second loop circulation is a B-phase loop circulation, and the third loop circulation is a C-phase loop circulation.
In order to solve the above problem, a coaxial cable circulating current detection apparatus is provided in a second aspect of the present invention, which is implemented based on the coaxial cable circulating current detection method provided in any embodiment of the present invention, and includes:
the circulation collector is used for respectively collecting first same-axis cable circulation, second-phase coaxial cable circulation and third-phase coaxial cable circulation;
the processor is used for calculating the first loop circulation, the second loop circulation and the third loop circulation based on the coaxial cable circulation detection method provided by any embodiment of the invention.
According to an embodiment of the invention, the circulating current collector is one of a single-core current transformer or a split-core ammeter.
According to an embodiment of the present invention, further comprising: the display screen is electrically connected with the controller, and the controller is electrically connected with the processor and used for controlling the display screen to display the calculation result of the processor.
According to an embodiment of the present invention, further comprising: the alarm is electrically connected with the controller, and the controller is electrically connected with the alarm and is used for controlling the alarm to give an alarm when the calculation result of the processor exceeds the threshold range.
In order to solve the above technical problem, a coaxial cable circulation detection system is further provided in an embodiment of the third aspect of the present invention, including the coaxial cable circulation detection apparatus provided in any embodiment of the present invention, further including: a screen display terminal;
the coaxial cable circulation detection device further comprises a first communication module, the screen display terminal comprises a second communication module, the first communication module is in communication connection with the second communication module and is used for establishing communication between the coaxial cable circulation detection device and the screen display terminal so as to be used for data transmission between the coaxial cable circulation detection device and the screen display terminal.
According to an embodiment of the present invention, the first communication module and the second communication module are in one of wireless communication and wired communication.
The coaxial cable circulation detection method, the device and the system provided by the embodiment of the invention are realized based on a three-phase cross-connection grounding system, and the detection method comprises the following steps: firstly, respectively acquiring a first same-axis cable circulation, a second-phase coaxial cable circulation and a third-phase coaxial cable circulation; and then establishing an equation relation according to the three-phase coaxial cable circulation and the circulation flow direction of each loop in the three-phase coaxial cable, and calculating the single loop circulation according to the equation relation. Therefore, the current of each loop of each cross interconnection metal sheath in the cross interconnection grounding system can be accurately, efficiently, low in labor force and high in safety and measured in real time, so that the current of the grounding wires of the first loop, the second loop and the third loop of the coaxial cable of the cross interconnection grounding system can be obtained, and whether the cross interconnection grounding system is abnormal or not can be judged more easily to a certain extent.
It should be understood that the statements in this section do not necessarily identify key or critical features of the embodiments of the present invention, nor do they necessarily limit the scope of the invention. Other features of the present invention will become apparent from the following description.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flow chart of a coaxial cable circulation detection method according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a cross-connection grounding system in a coaxial cable circulating current detection method according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a cross-connection grounding system in a coaxial cable circulation detection method according to another embodiment of the present invention;
fig. 4 is a schematic structural diagram of a cross-connection grounding system in a coaxial cable circulation detection method according to another embodiment of the present invention;
fig. 5 is a schematic structural diagram of a cross-connection grounding system in a coaxial cable circulating current detection method according to still another embodiment of the present invention;
fig. 6 is a schematic block diagram of a coaxial cable circulation detection apparatus according to an embodiment of the present invention;
fig. 7 is a schematic block diagram of a coaxial cable loop current detecting apparatus according to an embodiment of the present invention;
fig. 8 is a block diagram of a coaxial cable circulation detection system according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, 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 only a part of the embodiments of the present invention, and not all of the embodiments. 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 the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a flowchart of a coaxial cable circulating current detection method according to an embodiment of the present invention. The detection method is realized based on a three-phase cross-connection grounding system, and as shown in fig. 1, the detection method comprises the following steps:
s101, respectively acquiring a first same-axis cable circulation flow, a second-phase coaxial cable circulation flow and a third-phase coaxial cable circulation flow;
s102, establishing an equation relation according to the three-phase coaxial cable circulation and the circulation flow direction of each loop in the three-phase coaxial cable, and calculating the single loop circulation according to the equation relation.
It is understood that in a three-phase cross-connect grounding system, the first coaxial cable loop current, the second coaxial cable loop current and the third coaxial cable loop current can be obtained through a current transformer or a clamp meter. In addition, two connection modes are generally adopted in a three-phase cross-connection grounding system, wherein the first connection mode is that the head of a first phase is connected with the tail of a second phase, the head of the second phase is connected with the tail of a third phase, and the head of the third phase is connected with the tail of the first phase; the other is that the head of the first phase is connected with the tail of the third phase, the head of the second phase is connected with the tail of the first phase, and the head of the third phase is connected with the tail of the second phase. After the connection mode of the three-phase cross-connection grounding system is obtained, the flow direction of the circulation current of each loop in each same-axis cable can be obtained, the circulation current of two loops exists in each same-axis cable, and the previously measured circulation current of each same-axis cable is the sum of the circulation currents of the two loops. And further, an equation relation can be established, and finally, the single loop circulation is obtained through solving.
The following is a calculation process for specifically describing the single loop circulating current in different three-phase cross-interconnected grounding systems.
According to one embodiment of the present invention, as shown in fig. 2, in a three-phase cross-connect grounding system, the head of a first phase is connected to the tail of a second phase, the head of the second phase is connected to the tail of a third phase, and the head of the third phase is connected to the tail of the first phase. Each three-phase cross-coupled grounding system includes two cross-coupled grounding boxes, and in fig. 2, a three-phase cross-coupled grounding system including a first cross-coupled grounding box 202 and a second cross-coupled grounding box 203, that is, a first direct grounding box 201, a first cross-coupled grounding box 202, a second cross-coupled grounding box 203, and a second direct grounding box 205 is illustrated. Fig. 3 illustrates a three-phase cross-connected grounding system including two cross-connected grounding boxes (203, 204), that is, a first direct-connected grounding box 201, a second cross-connected grounding box 203, a third cross-connected grounding box 204 and a second direct-connected grounding box 205, wherein the first phase is an a phase, the second phase is a B phase, the third phase is a C phase, the first loop circulation is an a-phase loop circulation, the second loop circulation is a B-phase loop circulation, and the third loop circulation is a C-phase circulation.
S102, establishing an equation relation according to the three-phase coaxial cable circulation and the circulation flow direction of each loop in the three-phase coaxial cable, and calculating the single loop circulation according to the equation relation comprises the following steps:
in the first cross-coupled grounded tank 202, the first coaxial cable loop current is the sum of the incoming first loop current and the outgoing third loop current; the second-phase coaxial cable circulation current is the sum of the inflow second loop circulation current and the outflow first loop circulation current; the third-phase coaxial cable circulating current is the sum of the inflowing third loop circulating current and the outflowing second loop circulating current; establishing a first equation relation;
alternatively, in the second cross-coupled grounded tank 203, the first coaxial cable loop current is the sum of the third loop current flowing in and the second loop current flowing out; the second-phase coaxial cable circulating current is the sum of the inflow first-loop circulating current and the outflow third-loop circulating current; the third-phase coaxial cable circulating current is the sum of the inflowing second loop circulating current and the outflowing first loop circulating current; establishing a second equation relation;
alternatively, in the third cross-coupled grounded tank 204, the first coaxial cable loop current is the sum of the incoming second loop current and the outgoing first loop current; the second-phase coaxial cable circulation is the sum of the inflow third loop circulation and the outflow second loop circulation; the third-phase coaxial cable circulating current is the sum of the inflowing first loop circulating current and the outflowing third loop circulating current; establishing a third program relation;
and calculating the circulation of the first loop, the circulation of the second loop and the circulation of the third loop according to one equation relation of the first equation relation, the second equation relation or the third equation relation.
It will be appreciated that, in the first cross-connect ground box 202,
x, Y, Z is A, B, C coaxial cable circulation respectively, and of the three formulas, the first equation can be established by combining the three formulas through the scalar value measured by the modulus of the vector sum, and the first loop circulation, the second loop circulation and the third loop circulation can be solved in sequence. In the above three equations, the measured cable loop current of each identical axis only indicates magnitude and does not indicate direction, and the values of the finally calculated loop current of the three loops also only indicate magnitude and do not indicate direction.
Similarly, in the second cross-coupled ground box 203,
x, Y, Z is A, B, C coaxial cable loop current in turn, and the first loop current, the second loop current and the third loop current can be solved in turn by establishing a second equation through the simultaneous establishment of the three equations. In the above three equations, the measured cable loop current of each identical axis only represents magnitude and does not represent direction, and the finally calculated values of the three loop currents also represent magnitude and do not represent direction.
In the third cross-coupled ground box 204,
x, Y, Z is A, B, C coaxial cable loop current in turn, and the three equations are combined to establish a third equation, so that the first loop current, the second loop current and the third loop current can be solved in turn. In the above three equations, the measured cable loop current of each identical axis only indicates magnitude and does not indicate direction, and the values of the finally calculated loop current of the three loops also only indicate magnitude and do not indicate direction.
In other embodiments, only one cross-connected ground box 204 may be connected to the power grid system as required, or two cross-connected ground boxes may be connected to the power grid system, and after the loop direction in each cross-connected ground box is determined, the loop current size of a single loop may be obtained.
According to an embodiment of the present invention, as shown in fig. 4, in the three-phase cross-connect grounding system, the head of the first phase is connected to the tail of the third phase, the head of the second phase is connected to the tail of the first phase, and the head of the third phase is connected to the tail of the second phase; the three-phase cross-connected grounding system illustrated in fig. 4 includes a first direct grounding box 201, a first cross-connected grounding box 202, a second cross-connected grounding box 203, and a second direct grounding box 205. The three-phase cross-connect grounding system illustrated in fig. 5 includes a first direct grounding box 201, a second cross-connect grounding box 203, a third cross-connect grounding box 204, and a second direct grounding box 205. The first phase is an A phase, the second phase is a B phase, the third phase is a C phase, the first loop circulating current is an A phase loop circulating current, the second loop circulating current is a B phase loop circulating current, and the third loop circulating current is a C phase loop circulating current.
S102, establishing an equation relation according to the three-phase coaxial cable circulation current and the circulation current flow direction of each loop in the three-phase coaxial cable, and calculating the single-loop circulation current according to the equation relation comprises the following steps:
in the first cross-coupled grounded tank 202, the first coaxial cable loop current is the sum of the incoming first loop current and the outgoing second loop current; the second-phase coaxial cable circulating current is the sum of the inflowing second loop circulating current and the outflowing third loop circulating current; the third-phase coaxial cable circulation current is the sum of the inflow third loop circulation current and the outflow first loop circulation current; establishing a first equation relationship;
alternatively, in the second cross-coupled grounded tank 203, the first coaxial cable loop current is the sum of the inflowing second loop current and the outflowing third loop current; the second-phase coaxial cable circulation current is the sum of the inflow third loop circulation current and the outflow first loop circulation current; the third-phase coaxial cable circulation current is the sum of the inflow first loop circulation current and the outflow second loop circulation current; establishing a second equation relation;
alternatively, in the third cross-coupled grounded tank 204, the first coaxial cable loop current is the sum of the third loop current flowing in and the first loop current flowing out; the second-phase coaxial cable circulation flow is the sum of the inflow first loop circulation flow and the outflow second loop circulation flow; the third-phase coaxial cable circulating current is the sum of the inflowing second loop circulating current and the outflowing third loop circulating current; establishing a third program relation;
and calculating the circulation of the first loop, the circulation of the second loop and the circulation of the third loop according to one equation relation of the first equation relation, the second equation relation or the third equation relation.
The above embodiments can be referred to in the calculation process, and this embodiment is not described again. Therefore, the detection method can effectively solve the problem that the circulation magnitude of each loop cannot be obtained after the circulation monitoring device measures the coaxial cable circulation. The problem that the size of the circulation current of each loop can be obtained only by opening the grounding box to measure the cross interconnection link plate when the clamp meter is used for measurement can be solved.
Fig. 6 is a block diagram schematically illustrating a coaxial cable circulating current detecting apparatus according to an embodiment of the present invention. As shown in fig. 6, based on the implementation of the coaxial cable circulating current detection method provided in any embodiment of the present invention, the detection apparatus 300 includes:
at least one circulation collector 301 for respectively collecting a first coaxial cable circulation, a second coaxial cable circulation and a third coaxial cable circulation;
the processor 302 is configured to calculate the first loop circulating current, the second loop circulating current, and the third loop circulating current based on the coaxial cable circulating current detection method according to any embodiment of the present invention.
Wherein, the circulating current collector 301 is one of a single-core current transformer or a clamp meter. The loop current collector 301 may be provided only by one, or may be provided for each coaxial cable.
According to an embodiment of the present invention, as shown in fig. 7, the apparatus 300 further comprises: the display screen 303 is electrically connected with the controller 304, and the controller 304 is electrically connected with the processor 302 and is used for controlling the display screen 303 to display the calculation result of the processor 302.
It should be noted that the display screen 303 may be a display screen for displaying, which is well known in the art, such as an LED, an OLED, an LCD, an electronic paper, and the like. The display 303 may display the current loop current values of the loops of the current cross-coupled grounded ground tank obtained by the controller 304 from the processor 302 for reading by the tester.
According to an embodiment of the present invention, as shown in fig. 7, the apparatus 300 further comprises: an alarm 305 and a controller 304, wherein the alarm 305 is electrically connected with the controller 304, and the controller 304 is used for controlling the alarm 305 to alarm when the calculation result of the processor 302 exceeds a threshold range.
The alarm 305 may be an alarm device such as a buzzer, a horn, an indicator light, etc. for warning. The controller 304 may pre-store the upper and lower limits of the circulation value of each loop, and when the result calculated by the processor 302 is not within the range, the controller 304 controls the alarm 305 to alarm to alert the inspector.
In one embodiment, a loop current collector 301 is integrated with a processor 302, a controller 304, a display 303 and/or an alarm 305 to form the detection apparatus 300.
A plurality of loop current collectors 301 may also be integrated with a processor 302, a controller 304, a display 303 and/or an alarm 305 to form the detection device 300. The present invention is not particularly limited in this regard. When there are multiple loop collectors 301, the processor 302 and the controller 304 may process the data collected by the loop collectors 301 one after another and display the data on the display 303 one after another.
Fig. 8 is a block diagram of a coaxial cable loop current detection system according to an embodiment of the present invention. The system 400 includes the coaxial cable circulating current detection apparatus 300 according to any embodiment of the present invention, and further includes: a screen display terminal 500;
the coaxial cable circulation detection device 300 further includes a first communication module 306, the on-screen display terminal 500 includes a second communication module 501, the first communication module 306 establishes a communication connection with the second communication module 501, and is used for establishing communication between the coaxial cable circulation detection device 300 and the on-screen display terminal 500, so as to perform data transmission between the coaxial cable circulation detection device 300 and the on-screen display terminal 500.
According to an embodiment of the present invention, the first communication module 306 and the second communication module 501 are in one of wireless communication and wired communication.
The first communication module 306 and the second communication module 501 may communicate with each other through wireless communication methods such as bluetooth, radio frequency, wiFi, and the like, or may communicate with each other through wired communication methods. After the coaxial cable circulation detection device 300 and the screen display terminal 500 establish communication, data transmission can be performed between the coaxial cable circulation detection device 300 and the screen display terminal 500, that is, detection data of the detection device 300 can be sent to the screen display terminal 500, and the screen display terminal 500 can be a central control system of a power grid and can be checked by central control room personnel. The on-screen terminal 500 may also be a wearable device, an IPAD, a laptop, a desktop, etc. For different staff to view.
In summary, according to the coaxial cable circulating current detection method, apparatus, and system provided in the embodiments of the present invention, the detection method is implemented based on a three-phase cross-connected grounding system, and the detection method includes: firstly, respectively acquiring a first same-axis cable circulation, a second-phase coaxial cable circulation and a third-phase coaxial cable circulation; and then establishing an equation relation according to the three-phase coaxial cable circulation and the circulation flow direction of each loop in the three-phase coaxial cable, and calculating the single loop circulation according to the equation relation. Therefore, the current of each loop of each cross interconnection metal sheath in the cross interconnection grounding system can be accurately, efficiently, low in labor force and high in safety and measured in real time, so that the current of the grounding wires of the first loop, the second loop and the third loop of the coaxial cable of the cross interconnection grounding system can be obtained, and whether the cross interconnection grounding system is abnormal or not can be judged more easily to a certain extent.
It should be understood that various forms of the flows shown above may be used, with steps reordered, added, or deleted. For example, the steps described in the present invention may be executed in parallel, sequentially, or in different orders, and are not limited herein as long as the desired results of the technical solution of the present invention can be achieved.
The above-described embodiments should not be construed as limiting the scope of the invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A coaxial cable circulation detection method is characterized in that the detection method is realized based on a three-phase cross-connection grounding system, and comprises the following steps:
respectively acquiring first coaxial cable circulation, second coaxial cable circulation and third coaxial cable circulation;
and establishing an equation relation according to the three-phase coaxial cable circulation and the circulation flow direction of each loop in the three-phase coaxial cable, and calculating the single loop circulation according to the equation relation.
2. The circulating current detection method for coaxial cables as claimed in claim 1, wherein in the three-phase cross-connected grounding system, the head of the first phase is connected with the tail of the second phase, the head of the second phase is connected with the tail of the third phase, and the head of the third phase is connected with the tail of the first phase;
the establishing of an equation relation according to the three-phase coaxial cable circulation and the circulation flow direction of each loop in the three-phase coaxial cable, and the calculating of the single loop circulation according to the equation relation comprises the following steps:
the first coaxial cable circulation is the sum of the inflow first loop circulation and the outflow third loop circulation;
the second-phase coaxial cable circulation current is the sum of the inflow second loop circulation current and the outflow first loop circulation current; the third-phase coaxial cable circulating current is the sum of the inflowing third-loop circulating current and the outflowing second-loop circulating current; establishing a first equation relationship;
or the first same-axis cable circulating current is the sum of the inflowing third circuit circulating current and the outflowing second circuit circulating current; the second-phase coaxial cable circulating current is the sum of the inflow first-loop circulating current and the outflow third-loop circulating current; the third-phase coaxial cable circulating current is the sum of the inflowing second loop circulating current and the outflowing first loop circulating current; establishing a second equation relation;
or the circulating current of the first same-axis cable is the sum of the inflowing second loop circulating current and the outflowing first loop circulating current; the second-phase coaxial cable circulating current is the sum of the inflowing third loop circulating current and the outflowing second loop circulating current; the third-phase coaxial cable circulating current is the sum of the inflowing first loop circulating current and the outflowing third loop circulating current; establishing a third program relation;
and calculating the first loop circulation, the second loop circulation and the third loop circulation according to one equation relation of the first equation relation, the second equation relation or the third equation relation.
3. The circulating current detection method for coaxial cables as claimed in claim 1, wherein in the three-phase cross-connected grounding system, the head of the first phase is connected with the tail of the third phase, the head of the second phase is connected with the tail of the first phase, and the head of the third phase is connected with the tail of the second phase;
the establishing of an equation relation according to the three-phase coaxial cable circulation and the circulation flow direction of each loop in the three-phase coaxial cable comprises the following steps of:
the circulating current of the first same-axis cable is the sum of the circulating current of the first loop flowing in and the circulating current of the second loop flowing out;
the second-phase coaxial cable circulating current is the sum of the inflowing second loop circulating current and the outflowing third loop circulating current; the third-phase coaxial cable circulation current is the sum of the inflow third loop circulation current and the outflow first loop circulation current; establishing a first equation relation;
or the first same-axis cable circulating current is the sum of the inflow second loop circulating current and the outflow third loop circulating current; the second-phase coaxial cable circulation current is the sum of the inflow third loop circulation current and the outflow first loop circulation current; the third-phase coaxial cable circulation current is the sum of the inflow first loop circulation current and the outflow second loop circulation current; establishing a second equation relation;
or the first same-axis cable circulation is the sum of the inflowing third loop circulation and the outflowing first loop circulation; the second-phase coaxial cable circulation flow is the sum of the inflow first loop circulation flow and the outflow second loop circulation flow; the third-phase coaxial cable circulating current is the sum of the inflowing second loop circulating current and the outflowing third loop circulating current; establishing a third program relation;
and calculating the circulation of the first loop, the circulation of the second loop and the circulation of the third loop according to one equation relation of the first equation relation, the second equation relation or the third equation relation.
4. The coaxial cable loop current detection method according to any one of claims 1 to 3, wherein the first phase is an A phase, the second phase is a B phase, and the third phase is a C phase, the first loop current is an A-phase loop current, the second loop current is a B-phase loop current, and the third loop current is a C-phase loop current.
5. A coaxial cable circulation detection device, which is realized based on the coaxial cable circulation detection method according to any one of claims 1 to 4, and comprises:
the circulation collector is used for respectively collecting first coaxial cable circulation, second coaxial cable circulation and third coaxial cable circulation;
a processor for calculating a first loop circulation, a second loop circulation and a third loop circulation based on the coaxial cable circulation detection method as claimed in any one of claims 1 to 4.
6. The coaxial cable circulation detection device of claim 5, wherein the circulation collector is one of a single-core current transformer or a split-core ammeter.
7. The coaxial cable circulation detection apparatus according to claim 5, further comprising: the display screen is electrically connected with the controller, and the controller is electrically connected with the processor and is used for controlling the display screen to display the calculation result of the processor.
8. The coaxial cable circulation detection apparatus according to claim 5, further comprising: the alarm is electrically connected with the controller, and the controller is electrically connected with the alarm and is used for controlling the alarm to give an alarm when the calculation result of the processor exceeds the threshold range.
9. A coaxial cable circulation detection system comprising the coaxial cable circulation detection apparatus according to any one of claims 5 to 8, further comprising: a screen display terminal;
the coaxial cable circulation detection device further comprises a first communication module, the screen display terminal comprises a second communication module, the first communication module is in communication connection with the second communication module and is used for establishing communication between the coaxial cable circulation detection device and the screen display terminal so as to be used for data transmission between the coaxial cable circulation detection device and the screen display terminal.
10. The coaxial cable loop detection system of claim 9, wherein the first communication module and the second communication module are one of wireless communication or wired communication.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115825534A (en) * | 2023-02-23 | 2023-03-21 | 国网江苏省电力有限公司电力科学研究院 | Phase calibration cable sheath layer circulating current monitoring method and system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115825534A (en) * | 2023-02-23 | 2023-03-21 | 国网江苏省电力有限公司电力科学研究院 | Phase calibration cable sheath layer circulating current monitoring method and system |
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