CN104732035A - Protective design and assessment method for bundled direct-current power cables - Google Patents
Protective design and assessment method for bundled direct-current power cables Download PDFInfo
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Abstract
The invention provides a protective design and assessment method for bundled direct-current power cables. The method includes the following steps that typical distribution of laying of the bundled cables is determined; simulating calculation of electric power of the bundled cables is performed; a corresponding cable bundle arrangement mode is selected when the overall electric power on the cable bundle is minimum; simulating calculation of the strength of cable fasteners is performed; the strength of the cable fasteners is checked; on the basis of the characteristics, limitation and requirements of an actual cable laying place, the proper cable fasteners are designed and selected according to the strength checking result, and protective design of the bundled cables is performed on different portions according to different laying modes. Through the method, quantitative calculation and simulation on power of the bundled cables and the strength of the cable fasteners are achieved, and a theoretical basis is provided for protective design of the cables; on the basis that the stable fastening requirement is met, by checking the strength of the cable fasteners, fastening effectiveness of the electric power cable bundle can be accurately pre-estimated under the short-circuit limiting case.
Description
Technical field
The invention belongs to laying ship cable and guard technology, be specifically related to a kind of bunchy insulation DC electric cable protection Design and appraisal procedure.
Background technology
Insulation DC electric cable realizes the basis of direct current power system for distribution, and can the rationality of power cable layer and reliability determine continuous and effective powers.In actual use, particularly narrower and small in space occasion, the power cable of many same paths often have employed the mode that beam splitting is laid.
On the one hand, along with the continuous expansion of direct current power system scale, owing to being subject to the restriction of unit cable current capacity, the big current of same pole (negative or positive electrode) may need multi-cable parallel connection transmission, and due to boats and ships space constraint, there is bunchy laying state in many homopolarity cables.When system is short-circuited fault, can by huge short-circuit current in power cable, in bunch of cables, each power cable influences each other under electromagnetic field effect, bunch of cables entirety is made to produce larger electric power, phase repulsive interaction particularly between homopolarity cable, will impact the cable installation fittings of this bunch of cables periphery, when electric power is greater than the fastening force of cable installation fittings, its the possibility of result is that power cable departs from securing member, even power cable self sustains damage, and can cause impact in various degree to the normal operation of electric system belonging to cable.Therefore; in the cable protective design of direct current power system; the occasion of the occasion particularly had higher requirements to Operation of Electric Systems or cable not easy care and replacing, except the cable laying ensured under normal circumstances, also should consider in short-circuit limit situation the fastening of insulation DC electric cable and protection.
On the other hand, in traditional cable laying Method and process, only carried out designing qualitatively to the barrier propterty after cable laying, the barrier propterty of cable is assessed often through range estimation or simple estimation.But, to the insulation DC electric cable that bunchy lays, particularly comprise in bunched cables connect distinct device, different subsystem power cable time, size of current difference, direction are different owing to passing into for many power cables, the time differently also exists interactional complex relationship, cannot make accurate evaluation by simple estimation realization to the rationality of cable protective performance, validity.
As can be seen here, in cable protective design studies field, traditional, be that the cable protective method for designing of foundation cannot meet the design requirement that modern direct current power system security requirement is more and more higher, the degree that becomes more meticulous is more and more higher with steady operational status, need a kind of new method for designing as the design considerations of insulation DC electric cable barrier propterty and examination basis, and the barrier propterty of bunchy insulation DC electric cable is carried out to quantitative design, made and assessing exactly.
Summary of the invention
The technical problem to be solved in the present invention is: provide a kind of bunchy insulation DC electric cable protection Design and appraisal procedure, can realize carrying out quantitative calculating and design and make assessing exactly to the barrier propterty of insulation DC electric cable bundle.
The present invention for solving the problems of the technologies described above taked technical scheme is: a kind of bunchy insulation DC electric cable protection Design and appraisal procedure, is characterized in that: it comprises the following steps:
S1, determine the exemplary distribution of bunchy cable laying:
According to the actual laying state of bunched cables, according to bunch of cables connection device, the difference comprising number of cables and bunch of cables arrangement mode, the exemplary distribution mode of statistics bunched cables;
The electrodynamic simulation calculation of S2, bunched cables:
Exemplary distribution mode according to bunched cables sets up electric power realistic model, the calculation of short-circuit current result of electric system belonging to cable, determine the Short-circuit Working Condition that may produce maximum electrodynamic pow er, if bunch of cables contains the output cable of multiple equipment, then need be undertaken calculating and comparing by the operating mode that short-circuit current is maximum in each equipment output cable, the short-circuit current passed through in power cable under this short-circuit condition is input to electric power realistic model calculate, draw electric power suffered by each root cable, and gathered, calculate integral electric power suffered by bunch of cables, i.e. bunched cables electric power,
Choose bunch of cables arrangement mode corresponding when integral electric power is minimum suffered by bunch of cables;
The simulation calculation of S3, cable installation fittings intensity:
The laying state of bunch of cables arrangement mode corresponding time minimum corresponding to integral electric power suffered by bunch of cables, cable installation fittings is selected by the volume to bunch of cables, estimating of weight, add up all cable installation fittingses used and set up cable installation fittings realistic model, the bunched cables electric power that input S2 calculates, calculates cable installation fittings intensity;
S4, check cable installation fittings intensity:
Integral electric power and cable installation fittings intensity suffered by bunch of cables, both are compared, obtain the fastening performance check result of cable installation fittings, and assessment and analysis is carried out to result, if cable installation fittings intensity is more than or equal to integral electric power suffered by bunch of cables, then illustrate that cable installation fittings selection is suitable; If integral electric power is greater than the fastening strength of cable installation fittings suffered by bunch of cables, then reselect cable installation fittings or strengthened scheme is proposed to former cable installation fittings, after repeating S3 calculating, again carry out the strength check of S4, till cable installation fittings intensity meets the demands;
S5, the feature of laying occasion in conjunction with actual cable, restriction and requirement, according to the result of S4 strength check, design and select suitable cable installation fittings, point different laying way of local, different parts carry out the protection Design of bunched cables.
As stated above, described S5, according to the actual laying state of bunch of cables, according to cable installation fittings strength check result, proposes concrete means of defence to different parts place bunch of cables; Buffer protection measure is proposed: locate bunch of cables and pointed structures are close, carry out buffer protection.
Beneficial effect of the present invention is: achieve the quantitative calculating to bunched cables electric power and cable installation fittings intensity and emulation, for cable protective design provides theoretical foundation; On the basis meeting stable state fastening requirements, by the strength check to cable installation fittings, achieve and in short-circuit limit situation, accurately estimating of validity is fastened with to power cable bundle.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of one embodiment of the invention;
Fig. 2, Fig. 3 respectively respective amount are the typical power cables bundle arrangement mode schematic diagram of 6 and 12;
Fig. 4 is the cable protective form schematic diagram that the present invention adopts cable tight-hook;
Fig. 5 is typical cable bundle coordinate system schematic diagram;
Fig. 6 is the electrodynamic result of calculation schematic diagram (comprising size and Orientation) of unit cable in the present embodiment bunch of cables;
The cable tight-hook structural representation that Fig. 7 adopts for the present embodiment cable installation fittings;
Fig. 8 is cable tight-hook place coordinate system schematic diagram in the present embodiment;
The cable tight-hook realistic model that Fig. 9 adopts for the present embodiment cable installation fittings.
In figure: 1-pressure hull, 2-guard shield, 3-compression bar, 4-first rubber, 5-pine, 6-bunch of cables, 7-second rubber, 8-guide plate, the tight hook body of 9-, 10-bolt.
Embodiment
Below in conjunction with accompanying drawing and example, the present invention is further detailed explanation.
A kind of bunchy insulation DC electric cable protection Design and appraisal procedure, as shown in Figure 1, comprise the following steps:
S1, determine the exemplary distribution of bunchy cable laying:
According to the actual laying state of bunched cables, according to bunch of cables connection device, the difference comprising number of cables and bunch of cables arrangement mode, the exemplary distribution mode of statistics bunched cables;
The electrodynamic simulation calculation of S2, bunched cables:
Exemplary distribution mode according to bunched cables sets up electric power realistic model, the calculation of short-circuit current result of electric system belonging to cable, determine the Short-circuit Working Condition that may produce maximum electrodynamic pow er, if bunch of cables contains the output cable of multiple equipment, then need be undertaken calculating and comparing by the operating mode that short-circuit current is maximum in each equipment output cable, the short-circuit current passed through in power cable under this short-circuit condition is input to electric power realistic model calculate, draw electric power suffered by each root cable, and gathered, calculate integral electric power suffered by bunch of cables, i.e. bunched cables electric power,
Choose bunch of cables arrangement mode corresponding when integral electric power is minimum suffered by bunch of cables;
The simulation calculation of S3, cable installation fittings intensity:
The laying state of bunch of cables arrangement mode corresponding time minimum corresponding to integral electric power suffered by bunch of cables, cable installation fittings is selected by the volume to bunch of cables, estimating of weight, add up all cable installation fittingses used and set up cable installation fittings realistic model, the bunched cables electric power that input S2 calculates, calculates cable installation fittings intensity;
S4, check cable installation fittings intensity:
Integral electric power and cable installation fittings intensity suffered by bunch of cables, both are compared, obtain the fastening performance check result of cable installation fittings, and assessment and analysis is carried out to result, if cable installation fittings intensity is more than or equal to integral electric power suffered by bunch of cables, then illustrate that cable installation fittings selection is suitable; If integral electric power is greater than the fastening strength of cable installation fittings suffered by bunch of cables, then reselect cable installation fittings or strengthened scheme is proposed to former cable installation fittings, after repeating S3 calculating, again carry out the strength check of S4, till cable installation fittings intensity meets the demands;
S5, the feature of laying occasion in conjunction with actual cable, restriction and requirement, according to the result of S4 strength check, design and select suitable cable installation fittings, point different laying way of local, different parts carry out the protection Design of bunched cables.According to the actual laying state of bunch of cables, according to cable installation fittings strength check result, concrete means of defence is proposed to different parts place bunch of cables; Buffer protection measure is proposed: locate bunch of cables and pointed structures are close, carry out buffer protection.
For certain low cigarette power cable (model is for JYJPJR/SC-1) peculiar to vessel, be described in conjunction with actual laying state.
The first step, determines the exemplary distribution of bunchy cable laying.
As shown in Figure 2 and Figure 3, first the quantity of power cable is comprised according to every a branch of bunch of cables, bunch of cables is classified, as 6,12, the bunch of cables of corresponding equal number afterwards, classifies according to forming different arrangement modes by direction of current in cable connection device, cable, as the left figure of Fig. 2, cable is divided into levels distribution according to positive pole and negative pole, the right figure positive pole of Fig. 2 and negative pole cable then cross-distribution.
Second step, power cable bundle electric power calculates
(1) to cable number and set up coordinate system
According to the different arrangement modes of bunch of cables inner cable, cable is numbered, the arrangement mode of Figure 12 root cable as left in corresponding diagram 2, wherein 1 ~ No. 6 cable is the output cable of equipment 1, and 7 ~ No. 12 cables are the output cable of equipment 2, set up x-y coordinate axis, as shown in Figure 5.
(2) Short-circuit Working Condition is chosen
According to the type of the cable comprised in bunch of cables model, in conjunction with Power System Shortcuts Current calculation result, choose the maximum duty of short-circuit current.If bunch of cables contains the output cable of multiple equipment, then need be undertaken calculating and comparing by the operating mode that short-circuit current is maximum in each equipment output cable.For the bunch of cables of 12 shown in Fig. 5, contain the cable of 2 equipment, when time T1 equipment 1 correspondence 6 cables in by short-circuit current maximum, and electric current is not maximal value in 6 cables of now equipment 2 correspondence, in like manner, when time T2 equipment 2 correspondence 6 cables in by short-circuit current maximum.Therefore, the electric power in T1 moment and T2 moment need be carried out respectively to 12 bunchs of cables and calculate, and result of calculation is compared.
(3) unit cable electric power calculates
For in Fig. 5 No. 1 cable, when passing through electric current in affiliated 6 cables of equipment 1, No. 1 cable is by other 5 cable acting forces; When affiliated 6 cables of equipment 2 are by electric current, No. 1 cable is subject to this 6 cable acting forces; When in 12 cables all by electric current time, No. 1 cable is subject to the acting force of other 11 cables.
In electric system certain short dot be short-circuited fault time, when in cable belonging to T0 moment (any time in short-circuit process) equipment 1 and equipment 2, short circuit current i 1 and i2 are crossed in current-sharing, the electric power (vector) of unit cable can be calculated, comprise electrodynamic size and Orientation.Electrodynamic direction refers to the stressed angle with x-axis of cable, and scope is 0 degree ~ 360 degree, is just counterclockwise.The computing method of other 11 cables with it roughly the same.
(4) the electrodynamic calculating of bunch of cables
According to the electric power result of calculation of all unit cables, the cable electric power of bunch of cables is synthesized.Due to 12 external acting forces of cable size and Orientation in time and curent change, and do not reach maximal value at synchronization.Therefore carry out decomposing and superposing in x-axis, y-axis with cable electric power by 12, calculate the electric power component sum in x-axis, y-axis, in this, as the electrodynamic result of calculation of bunch of cables, bunch of cables X-axis electric power size is Fx, and Y-axis electric power size is Fy.
The arrangement mode of 12 bunch of cables inner cables is incessantly a kind of, after calculating, should choose the arrangement mode that wherein electric power is minimum to various arrangement mode.Bunch of cables electric power under figure arrangement mode as left in Fig. 3 is greater than the bunch of cables electric power under right figure arrangement mode.
3rd step, the simulation calculation of cable installation fittings intensity.
(1) cable installation fittings is chosen.
The cable installation fittings that the present embodiment is chosen is cable tight-hook, and Fig. 4 is the cable protective form schematic diagram that the present invention adopts cable tight-hook, and as shown in Figure 7, its major parameter is in table 1, and unit is mm for cable tight-hook structure.Cable tight-hook is made up of tight hook body 9, compression bar 3 and bolt 10 3 part, tight hook body 9 is for placing bunch of cables 6, bunch of cables is wrapped up by the second rubber 7 outward, lower end is placed in tight hook body 9 by guide plate, upper pine 5 and the first rubber 4 is padded successively after cable places, be loaded on compression bar 3, by bolt 10, tight hook body 9 and compression bar 3 coupled together afterwards, outside tight hook body 9, be provided with guard shield 2 and pressure hull 1.According to quantity and the distribution situation of cable, choose suitable tight hook size.If the outside diameter of cable is 45mm, as corresponded to 6 cables of Fig. 2, then at least need the space of 135mm × 90mm, the tight hook of model 1 can be selected, as 12 cables of corresponding diagram 3, mode according to 4 row 3 row (or 4 row 3 are arranged) at least needs the space of 180mm × 135mm, can select the tight hook of model 2 or model 3.
Table 1
| Model | B | C | D | L |
| 1 | 135 | 132 | 140 | 287 |
| 2 | 185 | 182 | 180 | 287 |
| 3 | 180 | 177 | 300 | 332 |
| 4 | 268 | 265 | 380 | 420 |
(2) coordinate system and cable installation fittings model is set up
According to the fastener constructions of Fig. 7 and the parameter of table 1, set up cable installation fittings coordinate system (as shown in Figure 8) and realistic model (as shown in Figure 9).
(3) electric power result of calculation is inputted
Bring the electric power result of calculation Fx of 12 bunchs of cables (arrangement mode is as the left figure of Fig. 3) and Fy into calculating, known acting force suffered by x-axis, each parts of y-axis direction cable tight-hook, and the distribution of acting force suffered by tight hook can be analyzed, and analyze stressed maximum position or parts.
4th step, checks cable installation fittings intensity
The result of calculation of second step and the 3rd step being compared, whether can effectively protective cable, and analyze check result if checking cable installation fittings.
The cable tight-hook of the present embodiment is divided into three parts, when bunch of cables is subject to electrodynamic action, all can produce acting force, and compression bar and bolt is movable part, become stressed weak link to three parts.
(1) suppose that compression bar is indeformable under electrodynamic action as rigid body, effect while can verification bolt bear the shearing force in the pulling force of X-axis and Y direction.
Electric power result of calculation Fx and Fy is brought into and calculates the shearing that bolt bears, the pulling force born, and it is stressedly checked.
When bolt simultaneously tension and when being cut, according to mechanics correlation computations, it is the stressed maximum weighted ability that must not exceed bolt and can bear comprehensively, otherwise bolt failure.
If the bolt chosen can meet above-mentioned requirements, then represent that this bolt is chosen suitable, can requirement of strength be met, if the bolt chosen can not meet above-mentioned requirements, then represent and again choose the larger bolt of intensity.
(2) when the bolt ensureing to connect pressure strip is not cut off or breaks, the stressing conditions of cable tight-hook pressure strip is checked according to realistic model, if suffered maximum stress has exceeded the yield limit of this material on pressure strip, mean that pressure strip is surrendered, intensity cannot meet the demands, and needs to strengthen.
(3) strength improving measure is proposed
From check result, if bunch of cables produces the fastening strength that electric power size does not exceed cable installation fittings under short circuit condition, then show that this cable installation fittings is selected rationally, intensity can meet the demands; Intensity if bunch of cables produces the fastening strength that electric power size has exceeded cable installation fittings under short circuit condition, then needs to reselect cable installation fittings, until can meet the demands.
5th step, proposes cable protective measure
For the actual complex situations of laying of cable and specific requirement, in conjunction with electric power result of calculation and cable installation fittings strength check result, propose cable protective measure, comprise following content:
(1) power cable bundle optimal alignment mode is determined.
From main cable electric power result of calculation, in bunch of cables, the arrangement mode of cable is different, and between cable, stressing conditions changes thereupon, and thus bunch of cables also can change with joint efforts.When bunch of cables adopts optimal alignment mode, between cable, the electric power effect of cancelling out each other is best, and it is minimum that bunch of cables produces electric power.
From fastening check result, electric power is larger, and the acting force that securing member need bear is larger, and securing member can meet protection intensity or reduce electric power, or increases fastening strength.If can manage to reduce electric power, just fundamentally can reduce the impact of electric power on cable, not need securing member to consider too much strengths of redundancy, if the contradiction that the excessive securing member of electric power cannot increase intensity can be solved simultaneously.
(2) according to the actual laying state of bunch of cables, according to fastener strength check result, concrete means of defence is proposed to different parts place bunch of cables.
In the present embodiment, as there being fixed pedestal, there is the position of sufficient space mainly adopt cable tight-hook to carry out the fixing of cable and protection, choose tight hook number and corresponding bolt model, compression bar material and parameter, determine the quantity and spacing of cable tight-hook.
Ruggedized cable clamp and reinforced metal clip can be selected (to calculate according to electric power and draw the cable installation fittings meeting requirement of strength after securing member check the place that unsettled section or cable bearer/cradle need be fixed, choose different design parameters according to the difference of result of calculation) etc. mode, choose the model of strain relief clamp and metal clip, material and parameter, determine its quantity and spacing; To there is no point of fixity and cable tie is then selected in the little position of construction space or position in need, determine the model of cable tie, quantity and canoe.
(3) buffer protection measure is proposed.
Except adopting the above various means of defence to power cable bundle, also need to consider to make the pointed structures around in power cable collision under short-circuit electromotive force effect, power cable is sustained damage.Therefore, buffer protection measure need be taked to likely making the position of cable fault.
The concrete grammar that the present embodiment adopts be locate bunch of cables and pointed structures are close; outside bunch of cables, wrap up rubber or wrap up rubber on pointed structures surface, and according to position and the method for respectively laying position, the concrete laying state of each bunch of cables determines to adopt buffer protection measure.
Above embodiment is only for illustration of design philosophy of the present invention and feature, and its object is to enable those skilled in the art understand content of the present invention and implement according to this, protection scope of the present invention is not limited to above-described embodiment.So all equivalent variations of doing according to disclosed principle, mentality of designing or modification, all within protection scope of the present invention.
Claims (2)
1. bunchy insulation DC electric cable protection Design and an appraisal procedure, is characterized in that: it comprises the following steps:
S1, determine the exemplary distribution of bunchy cable laying:
According to the actual laying state of bunched cables, according to bunch of cables connection device, the difference comprising number of cables and bunch of cables arrangement mode, the exemplary distribution mode of statistics bunched cables;
The electrodynamic simulation calculation of S2, bunched cables:
Exemplary distribution mode according to bunched cables sets up electric power realistic model, the calculation of short-circuit current result of electric system belonging to cable, determine the Short-circuit Working Condition that may produce maximum electrodynamic pow er, if bunch of cables contains the output cable of multiple equipment, then need be undertaken calculating and comparing by the operating mode that short-circuit current is maximum in each equipment output cable, the short-circuit current passed through in power cable under this short-circuit condition is input to electric power realistic model calculate, draw electric power suffered by each root cable, and gathered, calculate integral electric power suffered by bunch of cables, i.e. bunched cables electric power,
Choose bunch of cables arrangement mode corresponding when integral electric power is minimum suffered by bunch of cables;
The simulation calculation of S3, cable installation fittings intensity:
The laying state of bunch of cables arrangement mode corresponding time minimum corresponding to integral electric power suffered by bunch of cables, cable installation fittings is selected by the volume to bunch of cables, estimating of weight, add up all cable installation fittingses used and set up cable installation fittings realistic model, the bunched cables electric power that input S2 calculates, calculates cable installation fittings intensity;
S4, check cable installation fittings intensity:
Integral electric power and cable installation fittings intensity suffered by bunch of cables, both are compared, obtain the fastening performance check result of cable installation fittings, and assessment and analysis is carried out to result, if cable installation fittings intensity is more than or equal to integral electric power suffered by bunch of cables, then illustrate that cable installation fittings selection is suitable; If integral electric power is greater than the fastening strength of cable installation fittings suffered by bunch of cables, then reselect cable installation fittings or strengthened scheme is proposed to former cable installation fittings, after repeating S3 calculating, again carry out the strength check of S4, till cable installation fittings intensity meets the demands;
S5, the feature of laying occasion in conjunction with actual cable, restriction and requirement, according to the result of S4 strength check, design and select suitable cable installation fittings, point different laying way of local, different parts carry out the protection Design of bunched cables.
2. a kind of bunchy insulation DC electric cable protection Design according to claim 1 and appraisal procedure, it is characterized in that: described S5 is according to the actual laying state of bunch of cables, according to cable installation fittings strength check result, concrete means of defence is proposed to different parts place bunch of cables; Buffer protection measure is proposed: locate bunch of cables and pointed structures are close, carry out buffer protection.
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| CN108182313A (en) * | 2017-12-26 | 2018-06-19 | 海洋石油工程（青岛）有限公司 | The setting method in cable trace section |
| CN109767872A (en) * | 2018-12-27 | 2019-05-17 | 中国舰船研究设计中心 | Heavy DC cable arrangements method, bunch of cables and Ship Electrical Power System |
| CN112182936A (en) * | 2020-09-30 | 2021-01-05 | 上海船舶工艺研究所(中国船舶工业集团公司第十一研究所) | Method for quickly determining thickness of fixing ribbon of marine high-power direct-current cable |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108182313A (en) * | 2017-12-26 | 2018-06-19 | 海洋石油工程（青岛）有限公司 | The setting method in cable trace section |
| CN108182313B (en) * | 2017-12-26 | 2021-04-27 | 海洋石油工程（青岛）有限公司 | Method for setting cable path section |
| CN109767872A (en) * | 2018-12-27 | 2019-05-17 | 中国舰船研究设计中心 | Heavy DC cable arrangements method, bunch of cables and Ship Electrical Power System |
| CN109767872B (en) * | 2018-12-27 | 2022-12-06 | 中国舰船研究设计中心 | Large-current direct-current cable arrangement method, cable bundle and ship power system |
| CN112182936A (en) * | 2020-09-30 | 2021-01-05 | 上海船舶工艺研究所(中国船舶工业集团公司第十一研究所) | Method for quickly determining thickness of fixing ribbon of marine high-power direct-current cable |
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