CN115327226A - Coiled secondary cable insulation resistance testing method and system, terminal and storage medium - Google Patents
Coiled secondary cable insulation resistance testing method and system, terminal and storage medium Download PDFInfo
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Abstract
A coiled secondary cable insulation resistance test method and system, a terminal and a storage medium are provided, and the method comprises the following steps: collecting a secondary loop cable insulation standard value and the total length of a coiled cable, determining the maximum laying length of the cable in a station based on an A-star algorithm and a smoothing algorithm according to a secondary cable channel design drawing in the station, and calculating an insulation resistance reference value of the coiled secondary cable; testing the insulation resistance of the coiled secondary cable to obtain a coiled secondary cable insulation resistance test value, comprising: the test value of the insulation resistance of a single cable core, the test values of the insulation resistance among the cable cores and the test value of the overall insulation resistance; comparing the insulation resistance test values of the coiled secondary cables with insulation resistance reference values of the coiled secondary cables; if the insulation resistance test values of the coiled secondary cables are greater than the insulation resistance reference value of the coiled secondary cables, judging that the insulation resistance of the coiled secondary cables meets the standard; otherwise, the insulation resistance of the coiled secondary cable is judged to be not in accordance with the standard.
Description
Technical Field
The invention belongs to the field of power cable detection, and particularly relates to a coiled secondary cable insulation resistance testing method and system, a terminal and a storage medium.
Background
The insulation resistance is a resistance corresponding to a leakage current flowing through a dielectric medium after a certain time of polarization process by applying a direct current voltage to the dielectric medium, and is a most basic insulation index of electrical equipment and an electrical line. Routine tests of a conventional secondary cable when the cable is delivered from a factory comprise testing the insulation resistance, using a 1000V insulation resistance tester for measuring a cable below 1000V, using a 2500V insulation resistance tester for a cable above 1000V, using a 5000V insulation resistance tester for a cable above 6kV, and detecting whether the insulation of the cable is aged and damped and insulation defects exposed in a voltage withstand test by measuring the main insulation resistance of the power cable.
On the site of a transformer substation, the insulation resistance test of a secondary cable is an important link for debugging, overhauling and acceptance of capital construction of the transformer substation, and the insulation resistance test of the secondary cable on the site is mainly used for testing the cable laid in a secondary circuit, for example, the insulation inspection test of the secondary circuit is specified in the industrial standard DL _ T995-2016 (Relay protection and Power grid safety automatic device inspection code): when the protection device is newly installed in an acceptance test, all externally introduced loops and cables are completely disconnected from a terminal strip of a protection screen cabinet, all terminals of current, voltage, direct current control and signal loops are respectively connected together, a 1000V insulation resistance meter is used for measuring insulation resistance between the loops and the ground, and the resistance values of the insulation resistance meter are all larger than 10M omega.
In the prior art, most of insulation resistance tests of secondary cables are carried out on site, after the cables are laid, two ends of the cables are connected to corresponding devices and terminal blocks, a loop is untied before the tests are carried out, and insulation resistance of the secondary loop is tested by using a megameter (insulation megger). Although the method can effectively test the resistance of the loop, the cable which is unqualified through the insulation resistance test needs to be replaced, the cable is replaced by a qualified cable and then laid and connected, and the insulation test is carried out on the new loop again. In fact, if the coiled cable can be subjected to corresponding insulation resistance test before cable laying, the cable condition can be mastered in advance, and the trouble and waste caused by replacement after unqualified cable laying application are avoided. However, in the prior art, the cable loop insulation acceptance standard and the routine detection of the coiled cable are not combined, that is, the coiled cable is not subjected to insulation test according to the requirement of the secondary loop insulation inspection test, and by combining the experiences of a plurality of units such as capital construction debugging, maintenance and acceptance, the inventor finds that if the coiled cable is detected by adopting a factory routine detection method, even if the detection result at that time is greater than 10M Ω, the loop insulation after the secondary cable is laid is possibly less than 10M Ω, and the requirement of the secondary loop insulation standard cannot be met.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a coiled secondary cable insulation resistance test method and system, a terminal and a storage medium.
The invention adopts the following technical scheme.
The invention provides a coiled secondary cable insulation resistance testing method, which comprises the following steps:
step 1, collecting a secondary loop cable insulation standard value to obtain the total length of a coiled cable;
step 2, determining the maximum length of the laid cables in the station based on an A-star algorithm and a smoothing algorithm according to a secondary cable channel design drawing in the station;
step 3, calculating a reference value of insulation resistance of the secondary cable by using the data obtained in the steps 1 and 2;
step 4, testing the insulation resistance of the coiled secondary cable to obtain a coiled secondary cable insulation resistance test value, wherein the coiled secondary cable insulation resistance test value comprises: the insulation resistance test value of a single cable core, the insulation resistance test values among the cable cores and the overall insulation resistance test value;
step 5, comparing the insulation resistance test values of the coiled secondary cables with insulation resistance reference values of the coiled secondary cables; if the insulation resistance test values of the coiled secondary cables are greater than the insulation resistance reference value of the coiled secondary cables, judging that the insulation resistance of the coiled secondary cables meets the standard; otherwise, judging that the insulation resistance of the secondary cable does not meet the standard.
Preferably, in step 1, in the commissioning test of a new commissioning project, the standard value of the insulation resistance of the secondary loop cable is 10M Ω; and when the secondary device is regularly checked in the maintenance stage, the insulation resistance standard value of the secondary loop cable is 1M omega.
Preferably, in step 2, for a certain secondary cable loop in the total station range, determining each path in the loop by using an a-star algorithm and obtaining a fitting function f (x, y) of each path; the nodes at both ends of each path comprise: a laying starting point, a laying terminal point and a laying midway point; wherein, lay midway point including: changing the position of the laying path in the horizontal direction, changing the position of the laying path in the vertical direction and changing the position of the laying path obstacle;
each node can obtain a coordinate point from a secondary cable channel design drawing in the station.
Preferably, for any one section of path determined by using the a-algorithm, smoothing is performed on the fitting function f (x, y) of the section of path within the cable turning radius according to nodes at two ends of the section of path in a two-dimensional plane, so as to obtain a smooth fitting function q (x, y, Φ) on the section of path, wherein the steering angle Φ satisfies the following relation:
in the formula (I), the compound is shown in the specification,
x t 、y t is the coordinate of any point on the path of the segment,
x m 、y m the coordinates of the nodes on the path section near the cable laying starting point side,
ρ is the cable turning radius.
Preferably, the length of each section of path is calculated according to the smooth fitting function q (x, y, phi), and the sum of the lengths of each section of path is used as the path length of a certain secondary cable loop;
finding out the maximum value from the path length of the secondary cable loop in the total station as the maximum length L of the cable laying in the station max 。
Preferably, in step 3, the insulation resistance reference value of the coiled secondary cable satisfies the following relation:
in the formula (I), the compound is shown in the specification,
R p in order to obtain the reference value of the insulation resistance of the coiled secondary cable,
R h is the standard value of the insulation resistance of the secondary loop cable,
L max laying the maximum length for the cable in the station;
L p the total length of the coiled cable;
K 1 to measure the reliability factor;
K 2 is a loop correction factor.
Preferably, the reliability factor K is measured 1 Taking the value as 3, the loop correction factor K 2 The value is 2.5-3.
The invention also provides a coiled secondary cable insulation resistance test system, which comprises: the device comprises an acquisition module, an insulation resistance calculation module, an insulation resistance test module and a detection module.
The acquisition module is used for acquiring a secondary loop cable insulation standard value and the total length of the coiled cable;
the insulation resistance calculation module includes: the system comprises an in-station cable laying maximum length calculating unit and an insulation resistance reference value calculating unit; the station cable laying maximum length calculating unit is used for determining the station cable laying maximum length based on an A-x algorithm and a smoothing processing algorithm according to a station secondary cable channel design drawing; the insulation resistance reference value calculating unit is used for calculating a secondary cable insulation resistance reference value according to the data acquired by the acquisition module and the maximum length of the cable laying in the station determined by the maximum length of the cable laying in the station calculating unit;
the insulation resistance testing module is used for testing the insulation resistance of the coiled secondary cable to obtain a coiled secondary cable insulation resistance testing value; the insulation resistance test module includes: the testing device comprises a single cable core insulation resistance testing unit, insulation resistance testing units among cable cores and an integral insulation resistance testing unit; the single cable core insulation resistance test unit outputs a single cable core insulation resistance test value, the insulation resistance test unit among the cable cores outputs an insulation resistance test value among the cable cores, and the overall insulation resistance test unit outputs an overall insulation resistance test value;
the detection module is used for comparing the insulation resistance test value of the single cable core, the insulation resistance test value among the cable cores and the overall insulation resistance test value with the insulation resistance reference value of the coiled secondary cable; if the insulation resistance test values of the coiled secondary cables are greater than the insulation resistance reference value of the coiled secondary cables, judging that the insulation resistance of the coiled secondary cables meets the standard; otherwise, judging that the insulation resistance of the coiled secondary cable does not meet the standard and giving a warning.
In another aspect of the present invention, a terminal is further provided, which includes a processor and a storage medium; a storage medium to store instructions; the processor is used for operating according to the instructions to execute the steps of the coiling secondary cable insulation resistance testing method.
In another aspect, the present invention also provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the method for testing insulation resistance of an optical cable.
Compared with the prior art, the method for testing the insulation resistance of the coiled secondary cable has the advantages that the insulation resistance of the coiled cable can be tested before goods are received and the loop is laid, so that the influence of the problem of overall insulation of the loop caused by insufficient insulation of the coiled cable can be reduced. By using the method provided by the invention, the operation standard of the insulation resistance test of the coiled secondary cable before laying is established, the gate of the insulation test can be moved forward, the risk that the insulation does not meet the standard after laying the secondary cable is reduced, and the waste and blindness of cable replacement caused by the insulation failure are also reduced.
The invention fully utilizes the characteristic that the insulation resistance of the secondary cable is in inverse proportion to the effective measurement length of the secondary cable, takes the cable insulation resistance test corresponding to the maximum laying length of the cable in the station as a representative, and improves the test efficiency and the operability.
The invention uses the A-star algorithm and the allowable range of the turning radius of the cable to carry out curve smoothing to obtain the path length of the secondary cable loop, and the path length fully considers multiple factors such as the turning radius requirement, the requirement of crossing obstacles and the like in cable laying, so the path length is more consistent with the actual cable laying path, and the path length is used as the maximum length of the cable laying in the station, so that the calculation of the insulation resistance reference value of the coiled cable is more accurate and reliable. Meanwhile, when the reference value of the insulation resistance of the coiled cable is calculated in the process, the difference between the insulation resistance test of the coiled secondary cable and the insulation resistance test of the secondary loop cable caused by the error of a measuring instrument and the influence of a secondary loop path is fully considered, so that a measurement reliability coefficient and a loop correction coefficient are introduced, and the reliability and the accuracy of the insulation resistance test of the coiled secondary cable are further improved.
The secondary coiled cable insulation resistance test system provided by the invention immediately gives a warning to the coiled cable which does not meet the insulation requirement, namely informs constructors that the risk that the insulation of the cable does not meet the standard exists after the cable is laid.
Drawings
FIG. 1 is a flow chart of a method for testing insulation resistance of a secondary coiled cable provided by the invention;
fig. 2 is a schematic diagram of cabling in an embodiment of the 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 embodiments described in this application are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art without inventive step, are within the scope of protection of the present invention.
In the processes of debugging, overhauling, acceptance and the like of the basic construction of the transformer substation, if the coiled cable is detected by adopting a factory routine detection method, even if the detection result at that time is greater than 10M omega, the loop insulation after the secondary cable is laid is probably less than 10M omega, and the requirement of the secondary loop insulation standard cannot be met. Moreover, there are no standards or methods for insulation resistance testing for coiled cables in the prior art. Therefore, the invention provides a coiled secondary cable insulation resistance test method, as shown in fig. 1, the test method comprises:
step 1, collecting a standard value of the insulation resistance of the secondary loop cable to obtain the total length of the coiled cable.
In this embodiment, when performing the coiled secondary cable insulation resistance test on site, the collection of site data and parameters and the preparation of the test instrument are first performed. The gathering of the site data and parameters includes but is not limited to: standard value R of insulation resistance of secondary loop cable h Total length L of coiled cable p 。
Wherein, the insulation resistance standard value R of the secondary loop cable h Can be determined according to the actual project situation, taking the acceptance test of the new installation protection device as an example, a 1000V insulation resistance meter is needed to measure the insulation resistance between the circuit and the ground and among the circuits, and the resistance values of the insulation resistance meter are all larger than 10M omega, therefore R h =10M Ω. When the protection device is periodically checked, 1000V insulation resistance meters are used for measuring insulation resistance between the loops and the ground and between the loops, and the resistance values of the insulation resistance meters are all larger than 1M omega, so that R h ＝1MΩ。
Total length L of coiled cable p Determined by the total length of cable identified on the coiled cable.
In the preparation of the test instrument, a megohmmeter or an insulation megohmmeter which is commonly used for the cable insulation test is mainly prepared. The cable insulation test usually uses a megohmmeter with 1000V gear.
And 2, determining the maximum length of the cable laying in the station based on an A-x algorithm and a smoothing algorithm according to the secondary cable channel design drawing in the station.
On a secondary cable channel design drawing in a station, the laying length of each cable can be determined according to the use scene of coiled cables and the layout design in the station, a plurality of cables are laid in the total station, and according to the national standard GB/T3048.5-2007 part 5 of the electric wire and cable electric performance test method: in the calculation method provided in the insulation resistance test, the calculation formula of the insulation resistance of each secondary cable is as follows:
in the formula (I), the compound is shown in the specification,
R x is the insulation resistance of the secondary cable,
K i is a constant of an insulation resistance, and,
l is the effective measuring length of the secondary cable,
d is the outer diameter of the cable insulation,
d is the inner diameter of the secondary cable insulation.
When the insulation resistance test of the coiled secondary cable is carried out, the influence of the area of a cable core is not considered in the calculation process, and the insulation resistance of the secondary cable is inversely proportional to the effective measurement length of the secondary cable according to the formula (1). However, there are hundreds of different effective measurement lengths of the secondary cables in the total station range, if each secondary cable is subjected to insulation test, the test process is extremely complex and time-consuming, in order to improve the efficiency of testing the insulation resistance of the coiled secondary cables in the station, the cable corresponding to the maximum cable laying length in the total station can be selected as a representative for insulation test, and when the cable corresponding to the maximum cable laying length in the station is tested to be qualified, the insulation resistance tests of the rest cables in the station are qualified. The invention fully utilizes the characteristic that the insulation resistance of the secondary cable is in inverse proportion to the effective measurement length of the secondary cable, takes the cable insulation resistance test corresponding to the maximum laying length of the cable in the station as a representative, and improves the test efficiency and the operability.
Taking the cable channel shown in fig. 2 as an example, in the figure, the secondary loop cable is laid from the local convergence control box or the terminal box to the terminal strip corresponding to the protection device and the air switch in the cubicle screen cabinet, wherein L1 is the laying length of the secondary cable in the horizontal cable trench, and L2 is the sum of the laying length of the secondary cable in the vertical cable trench and the laying length of the secondary cable after exiting the cable trench after passing through the pipe. The cable run length can be roughly estimated as the sum of L1 and L2.
However, when the secondary cable is laid on site, the path of the secondary loop is very complex, the actual laying length of the cable is different due to different starting points and end points, and the actual laying length is also different due to obstacles on the laying channel and the turning radius of the cable, so that the accurate maximum length of the cable laying in the whole station cannot be obtained through the rough estimation, and the accuracy of the test is affected.
For a certain secondary cable loop, the invention provides a method for determining each path in the loop by using an A-x algorithm and obtaining a fitting function f (x, y) of each path; the nodes at the two ends of each path comprise: a laying starting point, a laying terminal point and a laying midway point; wherein, lay midway point including: changing the position of the laying path in the horizontal direction, changing the position of the laying path in the vertical direction and changing the position of the laying path barrier.
For any section of path, smoothing the fitting function f (x, y) of the section of path within the turning radius range of the cable according to nodes at two ends of the section of path in a two-dimensional plane to obtain a smooth fitting function q (x, y, phi) on the section of path, wherein the steering angle phi satisfies the following relational expression:
in the formula (I), the compound is shown in the specification,
x t 、y t is the coordinate of any point on the path of the segment,
x m 、y m the coordinates of the nodes on the path section near the cable laying starting point side,
ρ is the cable turning radius.
Calculating the length of each section of path according to the smooth fitting function q (x, y, phi), and taking the sum of the lengths of the sections of paths as the path length of the secondary cable loop; finding out the maximum value from the path length of the secondary cable loop in the total station as the maximum length L of the cable laying in the station max 。
The invention uses the A-star algorithm and the allowable range of the turning radius of the cable to carry out curve smoothing to obtain the path length of the secondary cable loop, and the path length fully considers multiple factors such as the turning radius requirement, the requirement of crossing obstacles and the like in cable laying, so the path length is more consistent with the actual cable laying path, and the path length is used as the maximum length of the cable laying in the station, so that the calculation of the insulation resistance reference value of the coiled cable is more accurate and reliable.
And 3, calculating a reference value of the insulation resistance of the secondary cable by using the data obtained in the steps 1 and 2.
Considering the difference between the insulation resistance test of the coiled secondary cable and the insulation resistance test of the secondary loop cable caused by the error of a measuring instrument and the influence of a secondary loop path, a measurement reliability coefficient and a loop correction coefficient are introduced, and the reference value of the insulation resistance of the coiled secondary cable meets the following relational expression by combining the derivation of the formula (1):
in the formula (I), the compound is shown in the specification,
R p in order to obtain the reference value of the insulation resistance of the coiled secondary cable,
R h the insulation resistance standard value of the secondary loop cable is 10M omega according to the standard in the debugging test of a new commissioning project, and the insulation resistance standard value of the secondary loop cable is 1M omega according to the standard when the secondary device is regularly checked in the maintenance stage;
L max laying a maximum length for the cable;
L p the total length of the coiled cable;
K 1 correcting the measurement reliability coefficient according to the measured data and engineering experience to obtain a value of 3;
K 2 the loop correction coefficient is corrected according to the measured data and engineering experience and is between 2.5 and 3;
in this example, R is taken h ＝10ΜΩ，L max =0.5km, assuming that the total length of the coiled cable is 1.5km. The insulation resistance reference value of the disc cable meeting the requirements calculated by using the formula (2) is as follows:
step 4, testing the insulation resistance of the coiled secondary cable to obtain a coiled secondary cable insulation resistance test value, wherein the coiled secondary cable insulation resistance test value comprises: a single cable core insulation resistance test value, an insulation resistance test value between cable cores, and an overall insulation resistance test value.
The test comprises the following steps: the testing method comprises the following steps of single cable core insulation resistance testing, insulation resistance testing among cable cores and overall insulation resistance testing.
The coiled cable is stripped at both ends and a cable core insulation test is performed using a prescribed test instrument (such as a 1000V megohm meter or an insulation megger). Considering that a single cable internally comprises a plurality of cable cores, insulation resistance test needs to be carried out on each cable core and the whole cable core. The megameter of 1000V gear is used for sequentially carrying out insulation resistance test of a single cable core, insulation resistance test between cable cores and integral insulation resistance test. Assuming that the disc cable contains 4 cable cores, the test items of the entire disc cable are performed with reference to table 1.
TABLE 1 secondary coiling cable insulation resistance test meter
The single cable core insulation resistance test refers to the insulation resistance test of a single cable core to a cable shielding layer. In the embodiment, the test of the single-core insulation resistance of the cable mainly tests the insulation results of 4 wire cores to the shielding layer respectively, one meter pen is connected with the cable core, and the other meter pen is connected with the shielding layer of the cable.
The test method is to use a test instrument, and two meter pens are connected with different cable cores. In this embodiment, the insulation resistance test between the cable core mainly tests the insulation resistance between 4 cable cores, and two meter pens connect different cable core tests respectively.
The overall insulation resistance test is to test the insulation resistance of the whole coiled cable to the shielding layer, the test method is to short-circuit all cable cores in the coiled cable together, a meter pen is connected with all the cable cores after short-circuit by using a test instrument, and the meter pen is connected with the cable shielding layer. In this embodiment, the overall insulation resistance of the cable is obtained by shorting 4 cable cores of the coiled resistance together, one meter pen is connected with all the shorted cable cores, and one meter pen is connected with the cable shielding layer.
After the insulation resistance test is completed every time, the cable needs to be subjected to discharge treatment before the next insulation test is started, so that the phenomenon that the insulation test is inaccurate due to the influence of capacitance charges is avoided. Therefore, before the 11 item tests, the cable is required to be subjected to discharge treatment.
Step 5, comparing the insulation resistance test values of the coiled secondary cables with insulation resistance reference values of the coiled secondary cables; if the insulation resistance test values of the coiled secondary cables are larger than the insulation resistance reference value of the coiled secondary cables, judging that the insulation resistance of the coiled secondary cables meets the standard; otherwise, judging that the insulation resistance of the secondary cable does not meet the standard.
In this embodiment, when the insulation resistance test result values of the 11 test items are all greater than 30M Ω, it is determined that the insulation resistance of the coiled cable meets the standard, and a secondary cable can be laid in use; otherwise, the disc cable is indicated to have the risk of insufficient insulation, and the disc cable is not recommended to be put into use.
The secondary coiled cable insulation resistance test method provided by the invention can be used for testing the insulation resistance of the coiled cable before goods arrival acceptance and loop laying, so that the influence of the problem of overall loop insulation caused by insufficient insulation of the coiled cable can be reduced. By using the method provided by the invention, the operation standard of the insulation resistance test of the coiled secondary cable before laying is established, the gate of the insulation test can be moved forward, the risk that the insulation does not meet the standard after laying the secondary cable is reduced, and the waste and blindness of cable replacement caused by the fact that the insulation does not meet the standard are also reduced.
The invention provides a coiled secondary cable insulation resistance test system on the other hand, which comprises: the device comprises an acquisition module, an insulation resistance calculation module, an insulation resistance test module and a detection module.
The acquisition module is used for acquiring the insulation standard value of the secondary loop cable and the total length of the coiled cable;
the insulation resistance calculation module includes: the system comprises an in-station cable laying maximum length calculating unit and an insulation resistance reference value calculating unit; the station cable laying maximum length calculating unit is used for determining the station cable laying maximum length based on an A-x algorithm and a smoothing processing algorithm according to a station secondary cable channel design drawing; the insulation resistance reference value calculating unit is used for calculating a secondary cable insulation resistance reference value according to the data acquired by the acquisition module and the maximum length of the cable laying in the station determined by the maximum length of the cable laying in the station calculating unit;
the insulation resistance testing module is used for testing the insulation resistance of the coiled secondary cable to obtain a coiled secondary cable insulation resistance testing value; the insulation resistance test module includes: the testing device comprises a single cable core insulation resistance testing unit, insulation resistance testing units among cable cores and an integral insulation resistance testing unit; the single cable core insulation resistance test unit outputs a single cable core insulation resistance test value, the insulation resistance test units among the cable cores output insulation resistance test values among the cable cores, and the overall insulation resistance test unit outputs an overall insulation resistance test value;
the detection module is used for comparing the insulation resistance test value of a single cable core, the insulation resistance test value among cable cores, the overall insulation resistance test value with the insulation resistance reference value of the coiled secondary cable; if the insulation resistance test values of the coiled secondary cables are greater than the insulation resistance reference value of the coiled secondary cables, judging that the insulation resistance of the coiled secondary cables meets the standard; otherwise, judging that the insulation resistance of the coiled secondary cable does not meet the standard and giving a warning.
The secondary coiled cable insulation resistance test system provided by the invention immediately gives an alarm to the coiled cable which does not meet the insulation requirement, namely, informs constructors that the insulation of the cable does not meet the standard risk after the cable is laid.
The present disclosure may be systems, methods, and/or computer program products. The computer program product may include a computer-readable storage medium having computer-readable program instructions embodied thereon for causing a processor to implement various aspects of the present disclosure.
The computer readable storage medium may be a tangible device that can hold and store the instructions for use by the instruction execution device. The computer readable storage medium may be, for example, but not limited to, an electronic memory device, a magnetic memory device, an optical memory device, an electromagnetic memory device, a semiconductor memory device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a Static Random Access Memory (SRAM), a portable compact disc read-only memory (CD-ROM), a Digital Versatile Disc (DVD), a memory stick, a floppy disk, a mechanical coding device, such as punch cards or in-groove projection structures having instructions stored thereon, and any suitable combination of the foregoing. Computer-readable storage media as used herein is not to be construed as transitory signals per se, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through a waveguide or other transmission medium (e.g., optical pulses through a fiber optic cable), or electrical signals transmitted through electrical wires.
The computer-readable program instructions described herein may be downloaded from a computer-readable storage medium to a respective computing/processing device, or to an external computer or external storage device via a network, such as the internet, a local area network, a wide area network, and/or a wireless network. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers and/or edge servers. The network adapter card or network interface in each computing/processing device receives computer-readable program instructions from the network and forwards the computer-readable program instructions for storage in a computer-readable storage medium in the respective computing/processing device.
The computer program instructions for carrying out operations of the present disclosure may be assembler instructions, instruction Set Architecture (ISA) instructions, machine-related instructions, microcode, firmware instructions, state setting data, or source or object code written in any combination of one or more programming languages, including an object oriented programming language such as Smalltalk, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The computer-readable program instructions may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider). In some embodiments, the electronic circuitry that can execute the computer-readable program instructions implements aspects of the present disclosure by utilizing the state information of the computer-readable program instructions to personalize the electronic circuitry, such as a programmable logic circuit, a Field Programmable Gate Array (FPGA), or a Programmable Logic Array (PLA).
Various aspects of the present disclosure are described herein with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the disclosure. It will be understood that each block of the flowchart illustrations and/or block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer-readable program instructions.
These computer-readable program instructions may be provided to a processor of a general purpose computer, special purpose computer, 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/acts specified in the flowchart and/or block diagram block or blocks. These computer-readable program instructions may also be stored in a computer-readable storage medium that can direct a computer, programmable data processing apparatus, and/or other devices to function in a particular manner, such that the computer-readable medium storing the instructions comprises an article of manufacture including instructions which implement the function/act specified in the flowchart and/or block diagram block or blocks.
The computer readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other devices to cause a series of operational steps to be performed on the computer, other programmable apparatus or other devices to produce a computer implemented process such that the instructions which execute on the computer, other programmable apparatus or other devices implement the functions/acts specified in the flowchart and/or block diagram block or blocks.
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of instructions, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (10)
1. A method for testing the insulation resistance of coiled secondary cables is characterized in that,
the method comprises the following steps:
step 1, collecting a secondary loop cable insulation standard value to obtain the total length of a coiled cable;
step 2, determining the maximum length of the cable laying in the station based on an A-x algorithm and a smoothing algorithm according to a secondary cable channel design drawing in the station;
step 3, calculating a reference value of insulation resistance of the secondary cable by using the data obtained in the steps 1 and 2;
step 4, testing the insulation resistance of the coiled secondary cable to obtain a coiled secondary cable insulation resistance test value, wherein the coiled secondary cable insulation resistance test value comprises: the insulation resistance test value of a single cable core, the insulation resistance test values among the cable cores and the overall insulation resistance test value;
step 5, comparing the insulation resistance test values of the coiled secondary cables with insulation resistance reference values of the coiled secondary cables; if the insulation resistance test values of the coiled secondary cables are greater than the insulation resistance reference value of the coiled secondary cables, judging that the insulation resistance of the coiled secondary cables meets the standard; otherwise, the insulation resistance of the coiled secondary cable is judged to be not in accordance with the standard.
2. The insulation resistance test method of coiled secondary cables according to claim 1,
in the step 1, in the debugging test of a new commissioning project, the standard value of the insulation resistance of the secondary loop cable is 10 MOmega; and when the secondary device is regularly checked in the maintenance stage, the insulation resistance standard value of the secondary loop cable is 1M omega.
3. The insulation resistance test method of coiled secondary cables according to claim 1,
in the step 2, in the range of the total station, for a certain secondary cable loop, determining each path in the loop by using an A-x algorithm and obtaining a fitting function f (x, y) of each path; the nodes at the two ends of each path comprise: a laying starting point, a laying terminal point and a laying midway point; wherein, lay the on-the-way point and include: changing the position of the laying path in the horizontal direction, changing the position of the laying path in the vertical direction and changing the position of the laying path obstacle;
each node can obtain a coordinate point from a secondary cable channel design drawing in the station.
4. The insulation resistance test method for coiled secondary cables according to claim 3,
for any section of path determined by using an A-star algorithm, smoothing is carried out on a fitting function f (x, y) of the section of path within a cable turning radius range according to nodes at two ends of the section of path in a two-dimensional plane, and a smooth fitting function q (x, y, phi) on the section of path is obtained, wherein a steering angle phi meets the following relational expression:
in the formula (I), the compound is shown in the specification,
x t 、y t is the coordinate of any point on the path of the segment,
x m 、y m for the coordinates of the nodes on the path near the starting point of the cable laying,
ρ is the cable turning radius.
5. The coiled secondary cable insulation resistance test method according to claim 5,
calculating the length of each section of path according to the smooth fitting function q (x, y, phi), and taking the sum of the lengths of each section of path as the path length of a certain secondary cable loop;
finding out the maximum value from the path length of the secondary cable loop in the total station as the maximum length L of the cable laying in the station max 。
6. The insulation resistance test method of coiled secondary cables according to claim 1,
in step 3, the insulation resistance reference value of the coiled secondary cable meets the following relational expression:
in the formula (I), the compound is shown in the specification,
R p in order to obtain the reference value of the insulation resistance of the coiled secondary cable,
R h is the standard value of the insulation resistance of the secondary loop cable,
L max laying the maximum length for the cable in the station;
L p the total length of the coiled cable;
K 1 to measure the reliability factor;
K 2 is a loop correction factor.
7. The coiled secondary cable insulation resistance test method according to claim 6,
measurement reliability factor K 1 Taking the value of 3, the loop correction factor K 2 The value is 2.5-3.
8. A coiled secondary cable insulation resistance testing system using the method of any one of claims 1 to 7, the system comprising: the device comprises an acquisition module, an insulation resistance calculation module, an insulation resistance test module and a detection module; it is characterized in that the preparation method is characterized in that,
the acquisition module is used for acquiring the insulation standard value of the secondary loop cable and the total length of the coiled cable;
the insulation resistance calculation module includes: the system comprises an in-station cable laying maximum length calculating unit and an insulation resistance reference value calculating unit; the station cable laying maximum length calculating unit is used for determining the station cable laying maximum length based on an A-star algorithm and a smoothing algorithm according to a station secondary cable channel design drawing; the insulation resistance reference value calculating unit is used for calculating a secondary cable insulation resistance reference value according to the data acquired by the acquisition module and the maximum length of the cable laying in the station determined by the maximum length of the cable laying in the station calculating unit;
the insulation resistance testing module is used for testing the insulation resistance of the coiled secondary cable to obtain a coiled secondary cable insulation resistance testing value; the insulation resistance test module includes: the testing device comprises a single cable core insulation resistance testing unit, an insulation resistance testing unit among cable cores and an integral insulation resistance testing unit; the single cable core insulation resistance test unit outputs a single cable core insulation resistance test value, the insulation resistance test units among the cable cores output insulation resistance test values among the cable cores, and the overall insulation resistance test unit outputs an overall insulation resistance test value;
the detection module is used for comparing the insulation resistance test value of the single cable core, the insulation resistance test value among the cable cores and the overall insulation resistance test value with the insulation resistance reference value of the coiled secondary cable; if the insulation resistance test values of the coiled secondary cables are greater than the insulation resistance reference value of the coiled secondary cables, judging that the insulation resistance of the coiled secondary cables meets the standard; otherwise, judging that the insulation resistance of the coiled secondary cable does not meet the standard and giving a warning.
9. A terminal comprising a processor and a storage medium; the method is characterized in that:
the storage medium is to store instructions;
the processor is configured to operate in accordance with the instructions to perform the steps of the method according to any one of claims 1 to 7.
10. Computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 7.
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