CN115825534B - Phase calibration cable sheath layer circulation current monitoring method and system - Google Patents
Phase calibration cable sheath layer circulation current monitoring method and system Download PDFInfo
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Abstract
A method for monitoring loop current of a phase-calibrated cable sheath layer, which is characterized by comprising the following steps: step 1, adopting a first transformer to collect current of a three-phase high-voltage cable body so as to obtain a first current; step 2, adopting a second transformer to collect current of the coaxial cable when the sheath lead of the three-phase high-voltage cable is connected into the cross-connection grounding box so as to obtain a second current; step 3, calculating and obtaining three-phase sheath layer current and minimum core current based on the first current and the second current; the phase calibration is carried out between the three-phase ground circulation and the minimum core current; and 4, carrying out defect judgment on the cable grounding system by taking the maximum grounding circulation, the circulation three-phase deviation ratio and the circulation wire core ratio as the standard. The invention fully overcomes the influence of phase deviation, and calibrates the amplitude and phase angle of the current to be analyzed, thereby ensuring the accuracy of the defect judgment result.
Description
Technical Field
The invention relates to the field of power systems, in particular to a phase calibration cable sheath layer circulating current monitoring method and system.
Background
The high-voltage cable grounding system has complex running environment, and can effectively find out whether the cable cross-connection grounding system has the defects of multipoint grounding, high circulation and the like through circulation detection, and timely eliminate the defects so as to avoid local overheating and accelerated aging of a circuit. Conventional techniques typically employ current transformers to perform loop tests from the location of the coaxial cable.
For example, background art document CN113640574a discloses an on-line monitoring device and a monitoring method for grounding loops of a tunnel cable sheath, wherein a first current transformer is installed at a grounding box of a high-voltage cable sheath or at a grounding part of a cross-connection box, each signal input channel of a current acquisition device acquires a grounding loop of the current sheath and a cable core current, analyzes and calculates a cable running state, and sends loop alarm information based on that the digital grounding loop of the cable sheath is larger than a grounding loop threshold of the cable sheath.
However, in the prior art, the primary component of the current collected by the current transformer is generally roughly determined according to the position of the current transformer, and the secondary component is completely ignored in analysis and calculation. Therefore, at present, no accurate analysis is performed on the components of the superimposed current acquired by the current transformer, which also results in the problem that the test process is not accurate enough and the test conclusion is easy to be misjudged.
Furthermore, because the coaxial cable contains a two-core or multi-core structure, the superposition current acquired by the current transformer has the problem of superposition of current vectors of various different sources. The maximum amplitude of the superimposed current tested by the current transformer cannot be accurately used for analyzing the sheath circulation of the high-voltage cable. If the phase angle deviation of the superimposed current is simply ignored, the test is interfered, and the problems of inaccurate test and misjudgment of conclusion exist.
In view of the foregoing, a new method and system for monitoring loop current of a cable sheath layer with phase calibration are needed.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a method and a system for monitoring the circulating current of a cable sheath layer in phase calibration.
The invention adopts the following technical scheme.
The invention relates to a phase calibration cable sheath layer circulating current monitoring method, which comprises the following steps: step 1, adopting a first transformer to collect current of a three-phase high-voltage cable body so as to obtain a first current; step 2, adopting a second transformer to collect current of the coaxial cable when the sheath lead of the three-phase high-voltage cable is connected into the cross-connection grounding box so as to obtain a second current; step 3, calculating and obtaining three-phase sheath layer current and minimum core current based on the first current and the second current; the phase calibration is carried out between the three-phase grounding circulation and the minimum core current; and 4, carrying out defect judgment on the cable grounding system by taking the maximum grounding circulation, the circulation three-phase deviation ratio and the circulation wire core ratio as the standard.
Preferably, the number of the first transformers is three, and the first transformers are respectively arranged on the three-phase high-voltage cable body to respectively collect the superposition current of the core current and the sheath layer current on the ABC three phases、/>And->The method comprises the steps of carrying out a first treatment on the surface of the The number of the second mutual inductors is three, and the second mutual inductors are respectively arranged on the three-phase coaxial cable to respectively collect cross circulation +.>、/>And->。
Preferably, the current acquisition is based on sampling intervals to acquire instantaneous magnitudes of superimposed currents or cross-currents.
Preferably, the three-phase sheath layer grounding current and the three-phase core current are calculated based on the amplitude and the phase angle of the three-phase superposition current and the amplitude and the phase angle of the three-phase cross circulation current.
Preferably, ABC three-phase sheath current、/>And->Satisfy the following requirements
Wherein the matrixIs a current direction matrix in the cross-connect, and has +.>，
Is a ground lead branch current and has +.>。
Preferably, the amplitude and phase angle of the three-phase sheath layer current are respectively
Wherein (1)>Is any one of three phases ABC, +.>And->Respectively are +.>The phases are adjacent to each other in front of and behind each other,
time->Time->，/>Time of day；
、/>Respectively are the modes of the superimposed currents of the corresponding phases,
、/>the phase angles of the superimposed currents of the corresponding phases respectively,
and->The mode and phase angle of the ground leg current, respectively.
Preferably, the three-phase core current of the high-voltage cable is solved according to the calculated three-phase sheath layer grounding current.
Preferably, the maximum ground circulation isWhen the maximum ground loop is greater than a first thresholdJudging that the cable grounding system has defects; the deviation ratio of the three phases of the circulation is->When the circulating current three-phase deviation ratio is larger than a second threshold value, judging that a cable grounding system has defects; the proportion of the circulation line core isWherein->And when the proportion of the circulating current wire cores is larger than a third threshold value, judging that the cable grounding system has defects.
Preferably, the first threshold is 200A, the second threshold is 2, and the third threshold is 50%.
In a second aspect the invention relates to a phase-calibrated cable jacket loop current monitoring system for implementing the steps of the method of the first aspect of the invention.
Compared with the prior art, the method and the system for monitoring the circulating current of the cable sheath layer with the phase calibration have the advantages that the first and the second mutual inductors are used for respectively collecting the currents of the high-voltage cable body and the coaxial cable connected with the sheath layer, and the fault of the grounding system is judged through the phase calibration. The invention fully overcomes the influence of phase deviation, and calibrates the amplitude and phase angle of the current to be analyzed, thereby ensuring the accuracy of the defect judgment result.
The beneficial effects of the invention also include:
1. according to the invention, after the first and second transformers are deployed at proper positions, each component of the current acquired by the transformers is accurately analyzed, so that the acquired current data can be ensured to fully restore the current state of an actual test in the process of analysis processing. The problem of long-term difficult elimination of partial faults and defect conditions due to the fact that secondary current components are ignored is prevented.
2. The invention further considers the phase deviation existing between three phases and between different current components on the basis of analyzing each component of the current. Meanwhile, the invention takes the phase angle of one current as the reference phase angle, realizes the calculation of the phase angles of other currents, and restores the actual value of each alternating current component through the calculation, thereby ensuring the accuracy of the judgment basis in defect judgment.
3. The invention adopts a software layer calculation mode to realize the conversion operation and the solution of the direct measurement result of the transformer, and realizes more accurate output of the conversion operation result after the phase deviation of each superposition component in the measurement current is considered.
Drawings
FIG. 1 is a schematic diagram showing steps of a method for monitoring loop current of a phase-calibrated cable sheath layer according to the present invention;
fig. 2 is a schematic diagram of a phase-calibrated cable sheath circulating current monitoring system according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. The described embodiments of the invention are only some, but not all, embodiments of the invention. All other embodiments of the invention not described herein, which are obtained from the embodiments described herein, should be within the scope of the invention by those of ordinary skill in the art without undue effort based on the spirit of the present invention.
Fig. 1 is a schematic diagram of steps of a method for monitoring loop current of a cable sheath layer with phase calibration according to the present invention. As shown in fig. 1, the first aspect of the present invention relates to a phase calibration cable sheath circulating current monitoring method, which comprises steps 1 to 4.
And step 1, adopting a first transformer to collect current of the three-phase high-voltage cable body so as to obtain a first current.
Fig. 2 is a schematic diagram of a phase-calibrated cable sheath circulating current monitoring system according to the present invention. As shown in fig. 2, the current condition of the cable is acquired by adopting different mutual inductors respectively arranged at different positions in the system.
First, the first transformer may be disposed on the high-voltage cable body, and the measurement of the total current on the high-voltage cable body is achieved by surrounding the single-phase high-voltage cable body.
In the prior art, such measurements will generally approximate the measurement result to the core current of the high voltage cable, because the core current of the high voltage cable acts as a good electrical conductor, with a larger flow of current, compared to the smaller current of the jacket layer on the outside of the high voltage cable core. Therefore, in the prior art, the current of the sheath layer is ignored. In the invention, in order to accurately judge the defect, the collected first current is regarded as the superposition of the current of each phase line core and the current of the sheath layer.
And 2, adopting a second transformer to collect current of the coaxial cable when the sheath lead of the three-phase high-voltage cable is connected into the cross-connection grounding box, so as to obtain a second current.
It will be appreciated that the second transformer of the present invention may be provided on a coaxial cable to which the jacket layer is connected. Reference is made to the methods of the prior art for a specific connection.
The second current obtained here may be understood as a superposition of currents in the coaxial cable, in particular, for example, a cross current from the C-phase and a cross current into the B-phase may be included in the coaxial cable to which the sheath leads of the a-phase high voltage cable are connected. Therefore, when the phase deviation exists in the three-phase sheath circulation, the actual single-phase sheath current cannot be accurately judged by adopting a simple superposition algorithm. This results in a problem that the criterion is liable to be out of order in defect judgment.
The present invention has been made in view of the above problems.
Preferably, the number of the first transformers is three, and the first transformers are respectively arranged on the three-phase high-voltage cable body to respectively collect the superposition current of the core current and the sheath layer current on the three phases、/>And->The method comprises the steps of carrying out a first treatment on the surface of the The number of the second mutual inductors is three, and the second mutual inductors are respectively arranged on the three-phase coaxial cable to respectively collect cross circulation +.>、/>And->。
As described above, the present invention captures a plurality of superimposed currents through the first and second transformers. It should be noted that, since the present invention can be designed as a real-time on-line monitoring system, the superimposed current and the cross-loop current collected here can be instantaneous values at different sampling times in practice.
And step 3, calculating and obtaining three-phase sheath layer current and minimum core current based on the first current and the second current. Wherein, the phase calibration is carried out between the three-phase ground circulation and the minimum core current.
Preferably, the current acquisition is based on sampling intervals to acquire instantaneous magnitudes of superimposed currents or cross-currents.
The instantaneous amplitude here cannot be considered as a simple superposition of the various current components, since there is a phase deviation of indeterminate magnitude between the various current components. Therefore, in order to actually restore the current criteria to be used from various current components, the amplitude and phase angle of each current component are further solved in the invention.
Preferably, the three-phase sheath layer grounding current and the three-phase core current are calculated based on the amplitude and the phase angle of the three-phase superposition current and the amplitude and the phase angle of the three-phase cross circulation current.
The specific calculation method is as follows:
three-phase sheath current、/>And->Satisfy the following requirements
Wherein the matrixIs a current direction matrix in the cross-connect, and has +.>，/>Is a ground lead branch current and has +.>。
And solving the equation, and obtaining the amplitude and phase angle of the three-phase sheath layer grounding current according to the superimposed current and the cross circulation.
Specifically, since the currents are vector values, the present invention derives the above formula as taking into consideration the characteristics of three-phase currents and the relationship between two-dimensional vector phase angles and magnitudes
And
In the course of this formula (ii) the formula,、/>and->The phase angles of the three-phase sheath currents are respectively calculated, and the values of the three-phase sheath currents can be known by solving the formula.
Preferably, the amplitude and phase angle of the three-phase sheath layer current are respectively
Wherein (1)>Is any one of three phases ABC, +.>And->Respectively are +.>The phases are adjacent to each other in front of and behind each other,
time->，/>Time->，/>Time of day；
、/>Respectively are the modes of the superimposed currents of the corresponding phases,
、/>the phase angles of the superimposed currents of the corresponding phases respectively,
and->The mode and phase angle of the ground leg current, respectively. Furthermore, after the three-phase sheath layer grounding current is obtained, the invention can further calculate the accurate three-phase wire core current, namely the current after the sheath layer current is planed in the high-voltage cable.
Because the sheath layer current and the three-phase core current have the same phase relation, the magnitude of the current amplitude can be calculated according to the detection value of the first transformer, and the three-phase core current is finally obtained.
And 4, performing defect judgment on the cable grounding system by taking the maximum grounding circulation, the circulation three-phase deviation ratio and the circulation wire core ratio as the standard.
After the current value obtained in the calculation step 3 is calculated, accurate judgment of the system defect can be realized according to a certain judgment standard.
Preferably, the maximum ground circulation isWhen the maximum grounding loop is greater than the first thresholdWhen the cable grounding system is in a fault state, judging that the cable grounding system is in a fault state; the deviation ratio of the three phases of the circulation is->When the circulation three-phase deviation ratio is larger than a second threshold value, judging that the cable grounding system has defects; the proportion of the circulation line core isWherein->And when the proportion of the circulating current wire cores is larger than a third threshold value, judging that the cable grounding system has defects.
In the invention, a plurality of different modes are respectively selected to realize the judgment of different defect types of the system. For example, when the maximum ground circulation is excessive, it can be considered that there is a serious damage to the sheath layer of the single-phase cable in the system. If the proportion of the three-phase deviation of the circulating current is too large, the condition that the partial sheath layer is abnormally broken or aged is possibly caused is indicated. If the proportion of the loop core is high, a problem of abnormal grounding of the system may occur.
Preferably, the first threshold is 200A, the second threshold is 2, and the third threshold is 50%.
The invention can set the specific value of the criterion of each different judging mode according to experience, and can also modify the value of the criterion according to the condition of the cross-connection ground boxes.
In one embodiment of the present invention, a test is performed on a section of high-voltage cable with a cross-connection earth box, and the test results of the first transformer and the second transformer are shown in table 1.
Table 1 high voltage cable cross-connect ground test data table
Because of the symmetrical relationship between the ABC phases, the magnitude of the current on the same axis cable was not tested in this example. The test result can be directly obtained through an oscilloscope and other instruments. In a second aspect the invention relates to a phase-calibrated cable jacket loop current monitoring system for implementing the steps of the method of the first aspect of the invention.
It will be appreciated that the output ports of the first and second sensors of the present invention may be connected to a multi-port oscilloscope apparatus or similar waveform sampling and processing means to effect the steps of the method of the first aspect of the present invention.
It may be understood that, in order to implement each function in the method provided in the foregoing embodiments of the present application, the waveform sampling and processing device includes a corresponding hardware structure and/or software module that performs each function. Those of skill in the art will readily appreciate that the algorithm steps of the examples described in connection with the embodiments disclosed herein may be implemented as hardware or a combination of hardware and computer software. Whether a function is implemented as hardware or computer software driven hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The embodiment of the application may divide the functional modules of the waveform sampling and processing device according to the above method example, for example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The integrated modules may be implemented in hardware or in software functional modules. It should be noted that, in the embodiment of the present application, the division of the modules is schematic, which is merely a logic function division, and other division manners may be implemented in actual implementation.
The apparatus includes at least one processor, a bus system, and at least one communication interface. The processor may be a central processing unit, a field programmable gate array, an application specific integrated circuit, or other hardware replacement. The memory may be a read-only memory, other type of static storage device that may store static information and instructions, a random access memory, or other type of dynamic storage device that may store information and instructions, and the like. The memory may be stand alone and coupled to the processor via a bus. The memory may also be integrated with the processor. The hard disk may be a mechanical disk or a solid state disk, which is not limited in the embodiment of the present invention. The interface card in the hard disk module is communicated with the hard disk. The storage node communicates with an interface card of the hard disk module to access the hard disk in the hard disk module.
In the above embodiments, it may be implemented in whole or in part by software, hardware, or any combination thereof. When implemented using a software program, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions described in accordance with embodiments of the present application are produced in whole or in part.
Compared with the prior art, the method and the system for monitoring the circulating current of the cable sheath layer with the phase calibration have the advantages that the first and the second mutual inductors are used for respectively collecting the currents of the high-voltage cable body and the coaxial cable connected with the sheath layer, and the fault of the grounding system is judged through the phase calibration. The invention fully overcomes the influence of phase deviation, and calibrates the amplitude and phase angle of the current to be analyzed, thereby ensuring the accuracy of the defect judgment result.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is intended to be covered by the claims.
Claims (9)
1. A method for monitoring loop current of a phase-calibrated cable sheath layer, which is characterized by comprising the following steps:
step 1, adopting a first transformer to collect current of a three-phase high-voltage cable body so as to obtain a first current、/>And->The method comprises the steps of carrying out a first treatment on the surface of the The first current is the superposition current of the core current and the sheath layer current on the ABC three phases;
step 2, adopting a second transformer to collect current of the coaxial cable when the sheath lead of the three-phase high-voltage cable is connected into the cross-connection grounding box so as to obtain a second current、/>And->The method comprises the steps of carrying out a first treatment on the surface of the Wherein the second current is a cross circulation on ABC three phases;
step 3, calculating and obtaining three-phase sheath layer current and minimum core current based on the first current and the second current;
wherein, ABC three-phase sheath layer current、/>And->Is +.>、/>And->Second current->、And->The association between is
In the matrixIs a current direction matrix in the cross-connect, and has +.>，
Is a ground lead branch current and has +.>，
The phase calibration is carried out between the three-phase sheath layer current and the minimum core current;
step 4, performing defect judgment on the cable grounding system by taking the maximum grounding circulation, the circulation three-phase deviation proportion and the circulation wire core proportion as the standard;
the circulation three-phase deviation ratio is the maximum value of the ratio of the amplitude values of any two three-phase sheath currents, and the circulation wire core ratio is the maximum value of the ratio of the amplitude value of any one three-phase sheath current to the minimum wire core current.
2. A phase-calibrated cable sheath loop current monitoring method as defined in claim 1, wherein:
the number of the first transformers is three, and the first transformers are respectively arranged on the three-phase high-voltage cable body to respectively collect first currents、/>And->；
The number of the second mutual inductors is three, and the second mutual inductors are respectively arranged on the three-phase coaxial cable to respectively collect second currents、/>And->。
3. A phase-calibrated cable sheath loop current monitoring method as defined in claim 2, wherein:
the current collection is to collect the instantaneous amplitude of the superimposed current or the cross circulation based on the sampling interval.
4. A phase-calibrated cable sheath loop current monitoring method as defined in claim 3, wherein:
and calculating the three-phase sheath layer current and the three-phase core current based on the amplitude and the phase angle of the three-phase superimposed current and the amplitude and the phase angle of the three-phase cross circulation current.
5. The phase-calibrated cable jacket loop current monitoring method of claim 4, wherein:
the amplitude and phase angle of the three-phase sheath layer current are respectively
Wherein,,is any one of three phases ABC, +.>And->Respectively are +.>The phases are adjacent to each other in front of and behind each other,
time->，/>Time->，/>Time->；
、/>Respectively are the modes of the superimposed currents of the corresponding phases,
、/>the phase angles of the superimposed currents of the corresponding phases respectively,
and->The mode and phase angle of the ground leg current, respectively.
6. A phase-calibrated cable sheath loop current monitoring method as defined in claim 5, wherein:
and solving the three-phase core current of the high-voltage cable according to the calculated three-phase sheath layer current.
7. A phase-calibrated cable sheath loop current monitoring method as defined in claim 5, wherein: the maximum ground circulation isJudging when the maximum grounding loop is larger than a first threshold valueThe fixed cable grounding system has defects;
the three-phase deviation ratio of the circulation isWhen the circulating current three-phase deviation ratio is larger than a second threshold value, judging that a cable grounding system has defects;
the proportion of the circulation line cores is thatWherein->And when the proportion of the circulating current wire cores is larger than a third threshold value, judging that the cable grounding system has defects.
8. A phase-calibrated cable sheath loop current monitoring method as defined in claim 7, wherein:
the first threshold is 200A, the second threshold is 2, and the third threshold is 50%.
9. A phase calibration cable sheath layer circulation current monitoring system is characterized in that:
the system being adapted to carry out the steps of the method as claimed in any one of claims 1 to 8.
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| KR101824730B1 (en) * | 2017-07-25 | 2018-03-22 | 주식회사 중앙씨아이씨 | The Measuring system of the Unperfected CircuitingCurrent of Underground Cable |
| CN113640574A (en) * | 2020-04-27 | 2021-11-12 | 南京南瑞继保电气有限公司 | Tunnel cable sheath grounding circulation on-line monitoring device and monitoring method |
| CN115201545B (en) * | 2022-07-07 | 2024-02-23 | 国网江苏省电力有限公司电力科学研究院 | Method for testing maximum value of induced current of high-voltage cable line cross-connection grounding system |
| CN115453417A (en) * | 2022-09-21 | 2022-12-09 | 广东电网有限责任公司 | High-voltage cable fault testing method |
| CN115436839A (en) * | 2022-09-23 | 2022-12-06 | 广东电网有限责任公司 | High-voltage single-core cable sheath circulating current testing method |
| CN115453181A (en) * | 2022-09-26 | 2022-12-09 | 广东电网有限责任公司 | Coaxial cable circulation detection method, device and system |
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