CN114877807B - High-voltage cable line displacement monitoring system and method for pumped storage power station - Google Patents
High-voltage cable line displacement monitoring system and method for pumped storage power station Download PDFInfo
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- CN114877807B CN114877807B CN202111209331.2A CN202111209331A CN114877807B CN 114877807 B CN114877807 B CN 114877807B CN 202111209331 A CN202111209331 A CN 202111209331A CN 114877807 B CN114877807 B CN 114877807B
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Abstract
The invention provides a high-voltage cable line displacement monitoring system and method for a pumped storage power station, comprising the following steps: the synchronous displacement unit is sleeved on the outer sheath of the cable; the displacement sensor is arranged close to the synchronous displacement unit and is used for measuring the displacement of the synchronous displacement unit; the acquisition module is used for respectively acquiring the periodic displacement of each observation point; the processing module is used for acquiring the displacement difference between each two adjacent observation points in the same moment; and the judging module is used for determining the reliability of the cable performance and the hoop performance of the cable according to the acquired displacement difference. The invention can calculate the displacement difference to obtain the displacement difference of the cable structure layer caused by load current in the cable operation process, obtain the cable structure change caused by thermal stress in the cable operation process, judge the cable performance and the hoop performance reliability of the cable, timely find the unreliable positions of the cable performance and the hoop performance of the cable, and effectively ensure the safe operation of the cable.
Description
Technical Field
The invention relates to the technical field of power transmission and transformation running state monitoring, in particular to a high-voltage cable line displacement monitoring system and method for a pumped storage power station.
Background
At present, the high-voltage cable is laid in the pumped storage power station and has two characteristics, namely the problem of high drop exists, and the cable lines laid in the pumped storage power station all have the high drop of tens of meters or even hundreds of meters. Such drop conditions typically employ direct vertical laying or laying on an angled ramp, whichever point there is a difference in the operation of the top and bottom cables. The top cable is affected by the dead weight of the lower cable, each structural layer is affected by tensile stress, and the bottom cable is affected by the dead weight of the upper cable, and each structural layer is affected by compressive stress. The higher the height, the greater the ramp angle, and the more pronounced the problem of stressing the top and bottom cables. Secondly, the length of a single section of the cable in the pumped storage power station is longer, and the section of the conductor is large. This makes the cable thermally mechanical properties evident due to the temperature rise of the conductor caused by the load current during operation of the cable, and the longer-term action of the thermal mechanical forces of the larger cable may lead to damage of the cable structural layers.
Disclosure of Invention
In view of the above, the invention provides a displacement monitoring system and a displacement monitoring method for a high-voltage cable line of a pumped storage power station, which aim to improve the operation reliability of the high-voltage cable line of the pumped storage power station, reduce the occurrence probability of cable insulation faults caused by the factors such as thermo-mechanical force and the like, and realize the monitoring and analysis of special operation states under the action of mechanical force in the operation process of the high-voltage cable line in the pumped storage power station.
In one aspect, the present invention provides a high voltage electrical cable line displacement monitoring system for a pumped storage power station, comprising:
the synchronous displacement unit is sleeved on the outer sheath of the cable;
the displacement sensor is arranged close to the synchronous displacement unit and is used for measuring the displacement of the synchronous displacement unit;
the acquisition module is used for respectively acquiring periodic displacement of each observation point;
the processing module is used for acquiring displacement differences between every two adjacent observation points in the same moment;
and the judging module is used for determining the reliability of the cable performance and the anchor ear performance of the cable according to the acquired displacement difference.
Further, the preset position comprises a cable segment vertically arranged with a height drop, 4 observation points are arranged on the cable segment vertically arranged with the height drop Gao Lacha, the acquisition module is further used for sequentially marking the 4 observation points as a, b, c, d and respectively measuring periodic displacement amounts at a, b, c and d, and the processing module is further used for respectively calculating displacement differences between a and b, between b and c and between c and d at the same moment.
Further, the preset position further comprises a cable section arranged along a slope, 3 observation points are arranged on the cable section arranged along the slope, the acquisition module is further used for sequentially marking the 3 observation points as x, y and z and respectively measuring periodic displacement amounts at the x, y and z positions, and the processing module is further used for respectively calculating displacement differences between x and z and displacement differences between z and y at the same moment.
Further, the judging module is further configured to determine reliability of cable performance and hoop performance of the cable according to a displacement difference between a and b, a displacement difference between b and c, and a displacement difference between c and d at the same time:
when the displacement difference a-b is zero or a positive value, the displacement of the point a is not transmitted to the point b, and the cable performance and the hoop performance at the points a and b are judged to be reliable; when the displacement difference a-b is a negative value, judging that the cable performance and the hoop performance of the point b have failure risks if the displacement of the point b is larger than that of the point a;
when the displacement difference b-c is zero or positive value, the displacement of the point b and the displacement of the cable between bc are partially eliminated before the displacement reaches the point c, and the cable performance and the hoop performance at the points b and c are reliable; when the displacement difference b-c is a negative value, the displacement of the c point is larger than the displacement of the b point, and the cable performance and the hoop performance of the c point are judged to have failure risks;
when the displacement difference c-d is zero or a positive value, the displacement of the point c is not transmitted to the point d, and the cable performance and the hoop performance at the points c and d are judged to be reliable; when the displacement difference c-d is a negative value, the displacement of the point d is larger than that of the point c, and the cable performance and the hoop performance of the point d are judged to have failure risks.
Further, the judging module is further configured to determine reliability of cable performance and hoop performance of the cable according to a displacement difference between x and z and a displacement difference between z and y in the same moment:
when the displacement difference x-z is zero or a positive value, the displacement of the x point is not transmitted to the z point, and the cable performance and the hoop performance at the x and z positions are judged to be reliable; when the displacement difference x-z is a negative value, the displacement of the z point is larger than that of the x point, and the risk of failure of the cable performance and the anchor ear performance of the z point is judged;
when the displacement difference z-y is zero or a positive value, the displacement of the z point is not transmitted to the y point, and the cable performance and the hoop performance at the z and y positions are judged to be reliable; when the displacement difference z-y is a negative value, the displacement of the y point is larger than that of the z point, and the cable performance and the hoop performance of the y point are judged to have failure risks.
Compared with the prior art, the method has the beneficial effects that the method can be used for calculating the displacement difference to obtain the displacement difference of the cable structure layer caused by load current in the cable operation process, so that the cable structure change caused by thermal stress in the cable operation process is obtained, the cable performance and the hoop performance reliability of the cable are judged, and accordingly the unreliable positions of the cable performance and the hoop performance of the cable can be timely found, and the safe operation of the cable can be effectively ensured.
Further, the invention can monitor and analyze the effectiveness of the cable fixing anchor ear, and if a certain displacement difference has larger abnormal change, the cable fixing anchor ear is proved to have the possibility of loosening or failure, and the overhaul and maintenance are timely enhanced, thereby ensuring the stability and the safety of the cable.
On the other hand, the invention also provides a high-voltage cable line displacement monitoring method for the pumped storage power station, which comprises the following steps:
a synchronous displacement unit is arranged on the outer sheath of the cable, and a displacement sensor is arranged;
setting a plurality of synchronous displacement units at preset positions of the cable to serve as observation points, and respectively acquiring periodic displacement of each observation point;
obtaining displacement differences between every two adjacent observation points in the same moment;
and determining the reliability of the cable performance and the hoop performance of the cable according to the acquired displacement difference.
Further, the preset position comprises a cable segment vertically arranged with a height difference, 4 observation points are arranged on the cable segment vertically arranged with the height difference Gao Lacha and are sequentially marked as a, b, c, d, periodic displacement amounts at a, b, c and d are respectively measured, and displacement differences between a and b, between b and c and between c and d at the same moment are respectively calculated.
Further, the preset position further comprises a cable section arranged along a slope, 3 observation points are arranged on the cable section arranged along the slope and are sequentially marked as x, y and z, periodic displacement amounts at the x, y and z are respectively measured, and displacement differences between x and z and displacement differences between z and y at the same moment are respectively calculated.
Further, the reliability of the cable performance and the hoop performance of the cable is determined according to the displacement difference between a and b, the displacement difference between b and c and the displacement difference between c and d at the same moment:
when the displacement difference a-b is zero or a positive value, the displacement of the point a is not transmitted to the point b, and the cable performance and the hoop performance at the points a and b are judged to be reliable; when the displacement difference a-b is a negative value, judging that the cable performance and the hoop performance of the point b have failure risks if the displacement of the point b is larger than that of the point a;
when the displacement difference b-c is zero or positive value, the displacement of the point b and the displacement of the cable between bc are partially eliminated before the displacement reaches the point c, and the cable performance and the hoop performance at the points b and c are reliable; when the displacement difference b-c is a negative value, the displacement of the c point is larger than the displacement of the b point, and the cable performance and the hoop performance of the c point are judged to have failure risks;
when the displacement difference c-d is zero or a positive value, the displacement of the point c is not transmitted to the point d, and the cable performance and the hoop performance at the points c and d are judged to be reliable; when the displacement difference c-d is a negative value, the displacement of the point d is larger than that of the point c, and the cable performance and the hoop performance of the point d are judged to have failure risks.
Further, according to the displacement difference between x and z and the displacement difference between z and y in the same moment, the reliability of the cable performance and the hoop performance of the cable is determined:
when the displacement difference x-z is zero or a positive value, the displacement of the x point is not transmitted to the z point, and the cable performance and the hoop performance at the x and z positions are judged to be reliable; when the displacement difference x-z is a negative value, the displacement of the z point is larger than that of the x point, and the risk of failure of the cable performance and the anchor ear performance of the z point is judged;
when the displacement difference z-y is zero or a positive value, the displacement of the z point is not transmitted to the y point, and the cable performance and the hoop performance at the z and y positions are judged to be reliable; when the displacement difference z-y is a negative value, the displacement of the y point is larger than that of the z point, and the cable performance and the hoop performance of the y point are judged to have failure risks.
It can be appreciated that the displacement monitoring method has the same beneficial effects as the displacement monitoring system, and will not be described in detail herein.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
FIG. 1 is a functional block diagram of a high voltage electrical circuit displacement monitoring system for a pumped storage power station provided by an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a synchronous displacement unit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram showing the arrangement positions between a synchronous displacement unit and a displacement sensor according to an embodiment of the present invention;
fig. 4 is a schematic diagram of positions of observation points of a cable segment vertically arranged with a high drop provided by an embodiment of the present invention;
fig. 5 is a schematic view of positions of observation points of cable segments arranged along a slope according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
Referring to fig. 1, the present embodiment provides a high-voltage cable circuit displacement monitoring system for a pumped-storage power station, including:
the synchronous displacement unit is sleeved on the outer sheath of the cable;
the displacement sensor is arranged close to the synchronous displacement unit and is used for measuring the displacement of the synchronous displacement unit;
the acquisition module is used for respectively acquiring periodic displacement of each observation point;
the processing module is used for acquiring displacement differences between every two adjacent observation points in the same moment;
and the judging module is used for determining the reliability of the cable performance and the anchor ear performance of the cable according to the acquired displacement difference.
Specifically, a plurality of synchronous displacement units are fixedly connected to the cable, and a displacement sensor is arranged at each synchronous displacement unit, so that the position of the synchronous displacement unit on the cable is used as an observation point.
Referring to fig. 2 and 3, a fixing ring is sleeved on the outer side wall of the cable 1, and the synchronous displacement unit 2 is connected with the fixing ring, so that the synchronous displacement unit 2 and the fixing ring synchronously move, and the synchronous displacement unit 2 and the cable 1 synchronously move when the cable 1 is displaced. The displacement sensor 3 is provided with a side of the synchronous displacement unit 2, which is disposed opposite to the synchronous displacement unit 2, and measures the displacement amount of the synchronous displacement unit 2 by the displacement sensor 3. Specifically, the synchronous displacement unit 2 is preferably a square metal block or a metal plate, and only needs to be capable of feeding back the displacement state of the cable 1.
Specifically, as shown in fig. 4, the preset position includes a cable segment with a vertical height drop, 4 observation points are arranged on the cable segment with a vertical height drop, the acquisition module is further configured to record the 4 observation points as a, b, c, d in sequence, measure periodic displacement amounts at a, b, c and d respectively, and the processing module is further configured to calculate a displacement difference between a and b, a displacement difference between b and c, and a displacement difference between c and d respectively at the same moment.
Specifically, a, b, c, d four observation points on a cable section vertically arranged with a height drop are respectively arranged at bending positions of the cable section, b and c observation points are arranged at vertical positions, a and d are arranged on horizontal observation points, and a, b, c, d four observation points are sequentially arranged from top to bottom.
Specifically, as shown in fig. 5, the preset position further includes a cable segment arranged along a slope, 3 observation points are arranged on the cable segment arranged along the slope, the acquisition module is further configured to record the 3 observation points as x, y and z in sequence, measure periodic displacement amounts at the x, y and z respectively, and the processing module is further configured to calculate a displacement difference between x and z and a displacement difference between z and y respectively at the same moment.
Specifically, three observation points x, y and z on the cable section arranged along the slope are uniformly arranged along the cable section obliquely arranged respectively, and the three observation points x, y and z are sequentially arranged from top to bottom.
Specifically, the judging module is further configured to determine reliability of cable performance and hoop performance of the cable according to a displacement difference between a and b, a displacement difference between b and c, and a displacement difference between c and d at the same time:
when the displacement difference a-b is zero or a positive value, the displacement of the point a is not transmitted to the point b, and the cable performance and the hoop performance at the points a and b are judged to be reliable; when the displacement difference a-b is a negative value, judging that the cable performance and the hoop performance of the point b have failure risks if the displacement of the point b is larger than that of the point a;
when the displacement difference b-c is zero or positive value, the displacement of the point b and the displacement of the cable between bc are partially eliminated before the displacement reaches the point c, and the cable performance and the hoop performance at the points b and c are reliable; when the displacement difference b-c is a negative value, the displacement of the c point is larger than the displacement of the b point, and the cable performance and the hoop performance of the c point are judged to have failure risks;
when the displacement difference c-d is zero or a positive value, the displacement of the point c is not transmitted to the point d, and the cable performance and the hoop performance at the points c and d are judged to be reliable; when the displacement difference c-d is a negative value, the displacement of the point d is larger than that of the point c, and the cable performance and the hoop performance of the point d are judged to have failure risks.
Specifically, the judging module is further configured to determine reliability of cable performance and hoop performance of the cable according to a displacement difference between x and z and a displacement difference between z and y in the same moment:
when the displacement difference x-z is zero or a positive value, the displacement of the x point is not transmitted to the z point, and the cable performance and the hoop performance at the x and z positions are judged to be reliable; when the displacement difference x-z is a negative value, the displacement of the z point is larger than that of the x point, and the risk of failure of the cable performance and the anchor ear performance of the z point is judged;
when the displacement difference z-y is zero or a positive value, the displacement of the z point is not transmitted to the y point, and the cable performance and the hoop performance at the z and y positions are judged to be reliable; when the displacement difference z-y is a negative value, the displacement of the y point is larger than that of the z point, and the cable performance and the hoop performance of the y point are judged to have failure risks.
It can be seen that the embodiment can be used for calculating the displacement difference to obtain the displacement difference of the cable structure layer caused by load current in the cable operation process, so that the cable structure change caused by thermal stress in the cable operation process is obtained, and the cable performance and the hoop performance reliability of the cable are judged, so that the unreliable cable performance and the unreliable hoop performance of the cable can be timely found, and the safe operation of the cable can be effectively ensured.
The cable fixing hoop can monitor and analyze the effectiveness of the cable fixing hoop, if a certain displacement difference has larger abnormal change, the cable fixing hoop is loose or fails, and timely reinforcement overhaul and maintenance are performed, so that the stability and safety of the cable are guaranteed.
In another preferred implementation manner based on the above embodiment, the present embodiment provides a high-voltage cable line displacement monitoring method for a pumped-storage power station, and the method of the present embodiment preferably adopts the system in the above embodiment. The method of the present embodiment comprises the steps of:
a synchronous displacement unit is arranged on the outer sheath of the cable, and a displacement sensor is arranged;
setting a plurality of synchronous displacement units at preset positions of the cable to serve as observation points, and respectively acquiring periodic displacement of each observation point;
obtaining displacement differences between every two adjacent observation points in the same moment;
and determining the reliability of the cable performance and the hoop performance of the cable according to the acquired displacement difference.
Specifically, the preset position comprises a cable segment vertically arranged with a height difference, 4 observation points are arranged on the cable segment vertically arranged with the height difference, the cable segment is sequentially marked as a, b, c, d, periodic displacement amounts at a, b, c and d are respectively measured, and displacement differences between a and b, between b and c and between c and d at the same moment are respectively calculated.
Specifically, the preset position further comprises a cable section arranged along a slope, 3 observation points are arranged on the cable section arranged along the slope and are sequentially marked as x, y and z, periodic displacement amounts at the x, y and z are respectively measured, and displacement differences between x and z and displacement differences between z and y at the same moment are respectively calculated.
Specifically, the reliability of the cable performance and the hoop performance of the cable is determined according to the displacement difference between a and b, the displacement difference between b and c and the displacement difference between c and d at the same moment:
when the displacement difference a-b is zero or a positive value, the displacement of the point a is not transmitted to the point b, and the cable performance and the hoop performance at the points a and b are judged to be reliable; when the displacement difference a-b is a negative value, judging that the cable performance and the hoop performance of the point b have failure risks if the displacement of the point b is larger than that of the point a;
when the displacement difference b-c is zero or positive value, the displacement of the point b and the displacement of the cable between bc are partially eliminated before the displacement reaches the point c, and the cable performance and the hoop performance at the points b and c are reliable; when the displacement difference b-c is a negative value, the displacement of the c point is larger than the displacement of the b point, and the cable performance and the hoop performance of the c point are judged to have failure risks;
when the displacement difference c-d is zero or a positive value, the displacement of the point c is not transmitted to the point d, and the cable performance and the hoop performance at the points c and d are judged to be reliable; when the displacement difference c-d is a negative value, the displacement of the point d is larger than that of the point c, and the cable performance and the hoop performance of the point d are judged to have failure risks.
Specifically, the reliability of the cable performance and the hoop performance of the cable is determined according to the displacement difference between x and z and the displacement difference between z and y in the same moment:
when the displacement difference x-z is zero or a positive value, the displacement of the x point is not transmitted to the z point, and the cable performance and the hoop performance at the x and z positions are judged to be reliable; when the displacement difference x-z is a negative value, the displacement of the z point is larger than that of the x point, and the risk of failure of the cable performance and the anchor ear performance of the z point is judged;
when the displacement difference z-y is zero or a positive value, the displacement of the z point is not transmitted to the y point, and the cable performance and the hoop performance at the z and y positions are judged to be reliable; when the displacement difference z-y is a negative value, the displacement of the y point is larger than that of the z point, and the cable performance and the hoop performance of the y point are judged to have failure risks.
It can be seen that the method of the embodiment can obtain the displacement difference of the cable structure layer caused by the load current in the cable operation process through the displacement difference of each observation point, so as to obtain the cable structure change caused by the thermal stress in the cable operation process, and judge the cable performance and the hoop performance reliability of the cable, so that the unreliable cable performance and the unreliable hoop performance position of the cable can be timely found, and the safe operation of the cable can be effectively ensured.
Further, the effectiveness of the cable fixing hoop can be monitored and analyzed, if a certain displacement difference has a large abnormal change, the possibility that the cable fixing hoop is loose or fails is indicated, and overhaul and maintenance are timely enhanced, so that the stability and safety of the cable are guaranteed.
Specifically, in the above embodiment, a synchronous displacement unit is installed on the outer sheath of the cable so as to synchronize with the displacement of the outer sheath of the cable, and the displacement of the synchronous displacement unit is measured by using a laser displacement sensor.
Specifically, for a high-voltage cable line with a high drop height vertically arranged, the periodic displacement amounts of the cables of 4 points (a, b, c, d) were measured and recorded simultaneously with displacement sensors at the top and bottom.
Specifically, the displacement difference between the measurement points a-b, the displacement difference between b-c, and the displacement difference between c-d at the same time are calculated.
Specifically, for high voltage cabling arranged along a slope, the periodic displacement of the cable at 3 points (x, y, z) is measured and recorded simultaneously with displacement sensors at the top, middle and bottom.
Specifically, the displacement difference between the measurement points x-z, the displacement difference between z-y, and the displacement difference between x-y at the same time are calculated.
Specifically, the criterion of the displacement difference measured under the high drop vertical arrangement condition on the cable line operation displacement is as follows:
when the displacement difference a-b is zero or positive, the displacement of the point a is not transmitted to the point b, and the cable performance and the hoop performance at the points a and b are reliable. When the displacement difference a-b is negative, the displacement of the b point is larger than the point a, which means that the point b is under the action of thermal stress and the gravity of the lower cable, and the larger the difference is, the larger the tensile force born by the point b is, and the important attention is paid to the cable structure and the anchor ear near the point b.
When the displacement difference b-c is zero or positive, the displacement of the point b and the displacement of the cable between bc are partially eliminated before the point c is reached, and the cable performance and the hoop performance at the points b and c are reliable. When the displacement difference b-c is a negative value, the displacement of the c point is larger than the b point, which means that the c point is subjected to the transmission of the displacement value and the action of the cable gravity caused by the cable thermal stress, and the larger the difference is, the larger the force born by the c point is, which means that the important attention is paid to the cable structure and the anchor ear near the c point.
When the displacement difference c-d is zero or positive value, the displacement of the point c is not transmitted to the point d, and the cable performance and the hoop performance at the points c and d are reliable. When the displacement difference c-d is a negative value, the displacement of d point is larger than the displacement of c point, which means that the larger the difference is, the larger the tensile force born by d point is, and the cable structure and the hoop near the d point are important to pay attention to.
Specifically, the displacement difference measured under the slope arrangement conditions versus the amount of cabling run displacement is determined as follows:
when the displacement difference x-z is zero or positive value, the displacement of the x point is not transmitted to the z point, and the cable performance and the hoop performance at x and z are reliable. When the displacement difference x-z is negative, the z-point displacement is larger than the x-point, which means that the z-point is under the action of thermal stress and lower cable gravity, and the larger the difference is, the larger the tensile force born by the z-point is, and the important attention is paid to the cable structure and the anchor ear near the z-point.
When the displacement difference z-y is zero or positive, the displacement of the z point is not transmitted to the y point, and the cable performance and the hoop performance at z and y are reliable. When the displacement difference z-y is negative, the y-point displacement is larger than the z-point, which means that the larger the difference is, the larger the tensile force born by the y-point is, and the more important the cable structure and the anchor ear near the y-point are.
When the embodiment is implemented, for the high-voltage cable line vertically arranged with high drop, after the cable is laid and fixed, 2 total 4 measuring points are respectively selected at the top and bottom positions of the high drop, the displacement sensors are respectively arranged on the measuring points, the measuring range of the displacement sensors is ensured to effectively cover the moving distance of the cable, and the adopted sensors are laser displacement sensors. The synchronous displacement unit is arranged on the outer sheath of the cable (closely contacted with the outer sheath of the cable to ensure that the displacement of the outer sheath is synchronous with the displacement of the structure), and the laser displacement sensor measures the displacement of the synchronous displacement unit. The displacement of a, b, c, d was measured in this way.
In the embodiment, for the high-voltage cable lines arranged along the slope, after the cable is laid and fixed, 1 total of 3 measuring points are respectively selected at the top, middle and bottom positions of the slope, the displacement sensors are respectively arranged on the measuring points, the measuring range of the displacement sensors is ensured to effectively cover the moving distance of the cable, and the adopted sensors are laser displacement sensors. The synchronous displacement unit is arranged on the outer sheath of the cable (closely contacted with the outer sheath of the cable to ensure that the displacement of the outer sheath is synchronous with the displacement of the structure), and the laser displacement sensor measures the displacement of the synchronous displacement unit. The displacement of x, y and z is measured according to the method.
When the embodiment is implemented, the cable performance and the reliability of the anchor ear performance can be timely determined by calculating the displacement difference between a-b, b-c, c-d, x-z and y-z, and analyzing and judging the state of the cable and the state of the anchor ear according to the calculated displacement difference.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects 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 of ordinary skill 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 (6)
1. A high-voltage cable line displacement monitoring system for a pumped storage power station is characterized in that,
comprising the following steps:
the synchronous displacement unit is sleeved on the outer sheath of the cable;
the displacement sensor is arranged close to the synchronous displacement unit and is used for measuring the displacement of the synchronous displacement unit;
the acquisition module is used for respectively acquiring periodic displacement of each observation point;
the processing module is used for acquiring displacement differences between every two adjacent observation points in the same moment;
the preset position comprises a cable section with a vertical height difference, 4 observation points are arranged on the cable section with the vertical height difference, the acquisition module is further used for sequentially marking the 4 observation points as a, b, c, d, respectively measuring periodic displacement amounts at a, b, c and d, and the processing module is further used for respectively calculating displacement differences between a and b, between b and c and between c and d at the same moment;
the preset position further comprises a cable section arranged along a slope, 3 observation points are arranged on the cable section arranged along the slope, the acquisition module is further used for sequentially marking the 3 observation points as x, y and z, respectively measuring periodic displacement at the x, y and z, and the processing module is further used for respectively calculating displacement differences between x and z and displacement differences between z and y at the same moment;
and the judging module is used for determining the reliability of the cable performance and the anchor ear performance of the cable according to the acquired displacement difference.
2. The high-voltage cable line displacement monitoring system for pumped storage power station as claimed in claim 1, which is characterized in that
The device is characterized in that the judging module is also used for determining the reliability of the cable performance and the hoop performance of the cable according to the displacement difference between a and b, the displacement difference between b and c and the displacement difference between c and d at the same moment:
when the displacement difference a-b is zero or a positive value, the displacement of the point a is not transmitted to the point b, and the cable performance and the hoop performance at the points a and b are judged to be reliable; when the displacement difference a-b is a negative value, judging that the cable performance and the hoop performance of the point b have failure risks if the displacement of the point b is larger than that of the point a;
when the displacement difference b-c is zero or positive value, the displacement of the point b and the displacement of the cable between bc are partially eliminated before the displacement reaches the point c, and the cable performance and the hoop performance at the points b and c are reliable; when the displacement difference b-c is a negative value, the displacement of the c point is larger than the displacement of the b point, and the cable performance and the hoop performance of the c point are judged to have failure risks;
when the displacement difference c-d is zero or a positive value, the displacement of the point c is not transmitted to the point d, and the cable performance and the hoop performance at the points c and d are judged to be reliable; when the displacement difference c-d is a negative value, the displacement of the point d is larger than that of the point c, and the cable performance and the hoop performance of the point d are judged to have failure risks.
3. The high-voltage cable line displacement monitoring system for pumped storage power station as claimed in claim 1, which is characterized in that
The device is characterized in that the judging module is also used for determining the reliability of the cable performance and the hoop performance of the cable according to the displacement difference between x and z and the displacement difference between z and y in the same moment:
when the displacement difference x-z is zero or a positive value, the displacement of the x point is not transmitted to the z point, and the cable performance and the hoop performance at the x and z positions are judged to be reliable; when the displacement difference x-z is a negative value, the displacement of the z point is larger than that of the x point, and the risk of failure of the cable performance and the anchor ear performance of the z point is judged;
when the displacement difference z-y is zero or a positive value, the displacement of the z point is not transmitted to the y point, and the cable performance and the hoop performance at the z and y positions are judged to be reliable; when the displacement difference z-y is negative, the displacement of the y point is larger than z
And (3) judging the risk of failure of the cable performance and the hoop performance of the y point by the displacement of the points.
4. A high-voltage cable line displacement monitoring method for a pumped storage power station is characterized in that,
comprising the following steps:
a synchronous displacement unit is arranged on the outer sheath of the cable, and a displacement sensor is arranged;
setting a plurality of synchronous displacement units at preset positions of the cable to serve as observation points, and respectively acquiring periodic displacement of each observation point;
obtaining displacement differences between every two adjacent observation points in the same moment; the preset position comprises a cable section vertically arranged with a high drop, 4 observation points are arranged on the cable section vertically arranged with the height of Gao Lacha and are sequentially marked as a, b, c, d, periodic displacement amounts at a, b, c and d are respectively measured, and displacement differences between a and b, between b and c and between c and d at the same moment are respectively calculated;
the preset position further comprises a cable section arranged along a slope, 3 observation points are arranged on the cable section arranged along the slope and are sequentially marked as x, y and z, periodic displacement amounts at the x, y and z are respectively measured, and displacement differences between x and z and displacement differences between z and y at the same moment are respectively calculated;
and determining the reliability of the cable performance and the hoop performance of the cable according to the acquired displacement difference.
5. The method for monitoring displacement of high-voltage cable circuit for pumped storage power station according to claim 4, wherein reliability of cable performance and hoop performance of the cable is determined according to displacement difference between a and b, displacement difference between b and c, and displacement difference between c and d at the same time:
when the displacement difference a-b is zero or a positive value, the displacement of the point a is not transmitted to the point b, and the cable performance and the hoop performance at the points a and b are judged to be reliable; when the displacement difference a-b is a negative value, judging that the cable performance and the hoop performance of the point b have failure risks if the displacement of the point b is larger than that of the point a;
when the displacement difference b-c is zero or positive, the displacement of the point b and the displacement of the cable between bc reach c
The cable performance and the hoop performance at the positions b and c are reliable after the partial elimination before the point; when the displacement difference b-c is a negative value
When the displacement of the c point is larger than that of the b point, judging that the cable performance and the anchor ear performance of the c point have failure
Risk of (2);
when the displacement difference c-d is zero or positive value, the displacement of the point c is not transmitted to the point d, and the points c and d are judged
The cable performance and the hoop performance are reliable; when the displacement difference c-d is negative, the displacement of the point d is larger than c
And (3) judging the failure risk of the cable performance and the hoop performance of the point d by the displacement of the point.
6. The method for monitoring displacement of high-voltage cable circuit for pumped-storage power station according to claim 4, wherein reliability of cable performance and hoop performance of the cable is determined according to displacement difference between x and z and displacement difference between z and y at the same time:
when the displacement difference x-z is zero or a positive value, the displacement of the x point is not transmitted to the z point, and the cable performance and the hoop performance at the x and z positions are judged to be reliable; when the displacement difference x-z is a negative value, the displacement of the z point is larger than that of the x point, and the risk of failure of the cable performance and the anchor ear performance of the z point is judged;
when the displacement difference z-y is zero or a positive value, the displacement of the z point is not transmitted to the y point, and the cable performance and the hoop performance at the z and y positions are judged to be reliable; when the displacement difference z-y is a negative value, the displacement of the y point is larger than that of the z point, and the cable performance and the hoop performance of the y point are judged to have failure risks.
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| JP2014055908A (en) * | 2012-09-14 | 2014-03-27 | Hitachi Ltd | Method and device for specifying ground-fault position of power cable |
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| JP2014055908A (en) * | 2012-09-14 | 2014-03-27 | Hitachi Ltd | Method and device for specifying ground-fault position of power cable |
| CN104390625A (en) * | 2014-11-24 | 2015-03-04 | 国家电网公司 | Exterior three-dimensional deformation monitoring method of street power station |
| EP3199961A1 (en) * | 2016-01-28 | 2017-08-02 | Technolution B.V. | Method and device for detecting and localizing abnormalities in a power cable |
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