Vision Cable - Phase to Phase
Contents
1. be less than or equal to the stationary ampacity 3 7 Defining a cable type Vision Cable analysis uses a database of cable types This database can be user defined using the Cable type editor The editor will be invoked by chosing from the main menu Extra Cable type editor PHASE TO PHASE 16 06 132 pmo Cable type editor Filters Conductor Isolation Number of conductors 1 Number of cores Shape Round Voltage level All Mi iz Solid Cable type YMeKrvas 6 10 KV 1x 95 Al v LE Semmes i Oilpipe None PR 6000 3 Isolation Isolation material XLPE unfilled Sheath Screen material Copper Tape 47 49 49 49 47 42 49 149 DEE lt gt 49 4 gt 4 gt Sheath material Copper Sheath cable type Separate Bedding Bedding material Rubber Arm Arm material Copper Cable serving Arm Bedding ass Arm type Wire Arm configuration Separate Dilpipe Filling Semi conducting layer Isolation Conductor Cable serving je u Sheath Lay of wire tapes Longitudinal lay ao a Cable serving material Figure 11 Cable type editor In the upper left part of the form an existing cable can be selected from the database Once selected this cable can be modified copied or deleted Also a new cable can be defined and added to the data2. chosen a picture of the cable cross section will be shown In this example a single core 10 kV XLPE cable of 95 mm2 i Circuit Cable type Lay Current Filters Isolation All Number of cores All Voltage level All Cable NY MeKrvas 6 10 k 1x 95 Al v M Cable serving M im Bedding Sheath Dilpipe Filling Semi conducting layer Isolation Conductor Figure 4 Selecting a cable type Lay After selecting a cable type the laying configuration has to be defined in the tab sheet Lay This also defines the laying in the ground or in the free air In this example the cable is buried at a depth of 1 m The cables core to core distance is twice the cable diameter button 2xDe in flat formation The sheets have been bonded at a single point Leave the form using OK PHASE TO PHASE 2 06 132 pmo ie Circuit Cable type Lay Current Lay Under ground Phase sequence right sequence Bonding single point Cables in trough O Under the ground Depth x position 0 Cable configuration flat formation v Distance between cables 62 mm De J Equally loaded identical cables Cables in duct o Figure 5 Defining the lay The cable circuit can be moved in the worksheet using the mouse The cable ampacity will be calculated automatically 3 4 Interpreting the results for the stationairy situation After def
3. its temperature and the air with its temperature In this worksheet all cables and results will be presented graphically PHASE TO PHASE 8 06 132 pmo Vision Cable Untitled a File New Edit View Calculate Results Extra Help ape ji il al ee 800 Ep A E A E A a N 1200 LAO 1 mu o 5 A A ls OOF A Ba Ho Figure 1 Vision Cable analysis worksheet In the worksheet all cable circuits and heat sources can be defined The next configurations are possible e one circuit or multiple above the ground e one or more circuits and heat sources in the ground 3 2 Defining the environment It is always necessary to define the environmental conditions The worksheet shows the environmental temperatures Other conditions depend on the situations for buried cables or cabled laid in free air For cables laid in free air apply e environmental air temperature e solar radiation yes or no These conditions can be defined by right mouse clicking in the worksheet on a spot above the ground level A pop up menu appears Choose Edit and In air The air temperature can defined in steps of 5 degrees Celsius PHASE TO PHASE 9 06 132 pmo Environment Under ground In air Temperature air 25 v T Solar radiation No ow Figure 2 Environmental conditions in free air For buried cables apply e drying out of soil none partial prevent e environmental ground temperature e ground thermal resistance T
4. E 13 06 132 pmo Vision Cable Untitled File New Edit view Calculate Results Extra Help email 0 ont Fe U 100 I 088 06 096 OFOL E o S oO Figure 8 Temperature image 3 5 Calculating the cyclic load The cyclic load calculation determines the amount of extra load above the stationary cable ampacity provided that the current follows a daily cyclic pattern of 24 values According to the IEC 60853 norm the largest current of such a cyclic load can be larger than the stationary ampacity To start this calculation select the cable circuit and from the main menu choose Calculate Cyclic current PHASE TO PHASE 14 06 132 pmo 1 Cyclic current Load cycle Hou Current 4 o EEE Load cycle MA Positive margin on load cycle Maximum permissble conductor temperature 4 Conductor temperature for daily load cycle 2 Conductor temperature for maximum load cycle 320 300 280 260 aon Maa Un a a a a a a a a a a LJ 23 45 6 7 8 9 1011 12 13 14 15 16 17 18 19 20 21 22 23 Options Calculation Show temperature Cyclic rating factor M Show current Maximum factor of cyclic load cycle Cancel Figure 9 Cyclic current calculation form The screen shows the default load cycle in a bar chart The values are presented on the left hand side These values correspond with the blue parts of the bar chart Behind the bar chart the c
5. base In the middle part of the form the constructional sizes are presented In the right hand side of the form the material properties are presented Changes in sizes will be graphically presented in the cable cross sectional diagram The diagram is drawn with reference to the outer covering This example schows Rated voltage phase to ground conductor cross sectional area conductor diameter isolation thickness screen cross sectional area screen diameter screen thickness bedding thickness armour internal diameter armour external diameter armour wire diameter armour number of wires outer diameter Uo Ac dc t1 As Ds ts t2 dAi dA df ni De PHASE TO PHASE 06 132 pmo In this example the screen has been constructed with a screen of copper tape and wires The copper wires have been defined as armour Changes made in the cable type editor will be saved after leaving the form with OK
6. esistance should be chosen carefully With respect to the application of Vision Cable analysis Phase to Phase BV can not be held liable for any misinterpretations of the IEC norms or incorrect use of the software Any questions or remarks can be made by e mail to cable phasetophase nl PHASE TO PHASE 5 06 132 pmo 2 Installation Network installation Vision Cable Analysis runs using the Microsoft Net framework Since Microsoft protects this framework at a high level it is not possible to run any software on the network using default settings Vision Cable analysis can be run from the network after special settings have been made on your PC For more information please contact by e mail cable phasetophase nl The installation process is as follows e download the installation program http www phasetophase nl download VisionCable exe e start VisionCable exe e If the installation program indicates that the Microsoft NET Framework has not been installed do the following o Close the installation program o browse to http www microsoft com downloads o choose NET Framework Version 1 1 Redistributable Package o download the software 23 Mb o start the program dotnetfx exe and follow the instructions o start the program VisionCable exe e follow the instructions to install Vision Cable analysis PHASE TO PHASE 7 06 132 pmo 3 Getting Started Vision Cable analysis is a practical computer program for calculation of
7. hese conditions can be defined by right mouse clicking in the worksheet on a spot below the ground level A pop up menu appears Choose Edit and Under ground The ground temperature can defined in steps of 5 degrees Celsius A Environment l Under ground Inair Drying of ground Temperature ground No drying of ground Thermal resistance ground Partial drying of ground Temperature dry wet ground Thermal resistance dry ground Thermal resistance wet ground Prevent drying of ground Maximum temperature of cable serving Thermal resistance ground Cancel Figure 3 Environmental conditions under ground In most countries the soil can be moist In cases of heavy loaded cables or crossings this soil can be dried out This can lead to a hot spot in the cable connection limiting the whole cable connection ampacity The specific thermal resistance for dried ground can be 2 5 Km W Ma PHASE TO PHASE 18 06 132 pmo 3 3 Adding a cable A new cable circuit can be added using New Circuit from the menu A dialogue form appears for defining the circuit properties e cable type e lay e current Cable type On the tab sheet Cable type the cable can be choosen from the cable database A filter assists in the selection procedure The filter criteria are e isolation plastic or no plastic e number of cores 1 or 3 e voltage level phase to phase voltage If a cable type has been
8. ining the cable type and the environment Vision Cable analysis automatically calculates the stationary cable ampacities All results will be presented in the worksheet The zoom functions are e use the zoom buttons and or e select the cable circuit by clicking with the left mouse button or by drawing a rectangle while the left mouse button held pressed down and choose the most right Zoom selectedspeed button Vision Cable Untitled File New Edit View Calculate Results Extra Help idm el PR Oe ee 0 Figure 6 Zoom functions After zooming in the calculated stationary cable ampacity and the temperatures of conductor sheet armour and outer covering will be presented PHASE TO PHASE 12 06 132 pmo RE Vision Cable Untitled TEAR File New Edit View Calculate Results Extra Help A sa di 088 du Po w M o ae E ez Oo de o fa o Figure 7 Calculated stationary cable ampacity The worksheet shows the temperatures of the hottest cable Between brackets the temperatures of all cables of this circuit are presented In this case the center cable is the hottest one The results can be examined in detail by selecting the cable circuit and choosing Results General A function has been added to calculate the underground temperature image for the stationary case From the menu choose Calculate Temperature range The temperatures are presented in steps of 5 degrees Celsius PHASE TO PHAS
9. onductor temperature for this current profile has been plotted orange line A user defined load cycle can be exported by using the button Export Previously saved load cycles can be imported by using the button Import All imported current values are limited to two times the stationary ampacity This example concentrates on the default load cycle The Cyclic rating factor M indicates the maximum value of the load cycle as factor of the stationary ampacity In this example Imax cyclic M x Imax stationary 1 189 x 273 325 A The Maximum factor of cyclic load cycle is the maximum multiplication factor for all values of the load cycle In this example 1 25 PHASE TO PHASE 15 06 132 pmo The cyclic calculation is only possible for configurations of one circuit 3 6 Calculating the emergency load The IEC 60853 norm describes the Emergency Load calculation for determination of a maximum duration of a stepwise change of current in case of an emergency To start the calculation from the main menu choose Calculate Maximum load ie Maximum load Y DR Time hours Normal current 100 A Calculate Y Alleen lijnen Time 24 hours 73D Cancel Figure 10 Maximum emergency load The result is a graph presenting the emergency load a function ofthe emergency duration In this example starting with a pre emergency load of 100 A the 8 hours emergency load may be 363 A After this emergency the cable load must
10. s PHASE TO PHASE User manual Vision Cable 1 2 06 132 pmo 7 9 2006 Phase to Phase BV Utrechtseweg 310 Postbus 100 6800 AC Arnhem The Netherlands T 31 26 352 37 00 F 31 26 352 37 09 www phasetophase com Contents 3 1 3 2 3 3 3 4 3 5 3 6 3 7 PHASE TO PHASE 1 06 132 pmo Introducir RE 3 EA NO 5 Getting St rted uenssesena ln nn E E ENES 7 Opening a new worksheet rr eses 7 Defining the environment nn O ete Interpreting the results for the stationairy situation nnenneenseesssssssssseesseeseesennennnnennnnnnn n Calculating the cyclic load EE 13 Calculating the emergency load error noes 15 Defining a cable type eres 15 an PHASE TO PHASE 3 06 132 pmo 1 Introduction O OO Vision Cable analysis is a practical computer program for calculation of the electric current rating of cables The calculation method is based on both the IEC 60287 and the IEC 60853 standard Thanks to the logical and user friendly user interface the computer program is easy to learn The IEC 287 standard is used for calculation of the stationary cable current rating The results are the basis for the dynamic calculations according to the IEC 60853 standard Using this standard the cyclic and emergency current ratings can be calculated The user should concentrate on the hot spots in the cable connection caused by dry ground and neighbouring heat sources Also the correct ground temperature and ground thermal r
11. the electric current rating of cables The calculation method is based on both the IEC 60287 and the IEC 60853 standard Thanks to the logical and user friendly user interface the computer program is easy to learn The IEC 287 standard is used for calculation of the stationary cable current rating The results are the basis for the dynamic calculations according to the IEC 60853 standard Using this standard the cyclic and emergency current ratings can be calculated The user should concentrate on the hot spots in the cable connection caused by dry ground and neighbouring heat sources Also the correct ground temperature and ground thermal resistance should be chosen carefully The user interface has been subdivided into two parts the worksheet and the cable type editor In the worksheet all cable connections can be defined in or above the ground The cable editor is the tool to define the cables All cables are stored in the cable database Cables can be added modified and deleted In 6 steps this Getting Started shows the shortest route from scratch to the first cable calculations Opening a new worksheet 7 Defining the environment 8 Adding a cable 107 Interpreting the results for the stationary situation at Calculating the cyclic load 137 Calculating the emergency load 187 au nw n7 3 1 Opening a new worksheet Directly after starting the program Vision Cable analysis shows a new empty worksheet showing the ground with
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