Program for mechanical calculation of wires, cords, self-supporting cables - PowerPoint Presentation

Slide1

Program for mechanical calculation of wires, cords, self-supporting cables on overhead power and communication lines «LineMech» & «LineMechCad»

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Slide2

Aim of Program

Purposes of Program Implementation

Program Limitations

Example for Data Input

Calculating Modes

Calculation Results

Supports-Spotting PatternsSagging Curves

Results of Program Options’ Application

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Slide3

Aim of Program

The aim of the program is to automatize mechanical calculation of a wire, cord, self-supporting cable based on permissible tension method.

Slide4

Purposes of Program Implementation

To select the permissible tension (stress) in the wire, cord, strength part of a self-supporting cable material for the project.

s

Slide5

Purposes of Program Implementation

To select tension in the cord based on the distance between the wire and the cord in a span.

l

s

Slide6

Purposes of Program Implementation

Compare the sagging of wire and cord, wire and self-supporting cable at different modes.

f

f

f

cord

cable

wire

Slide7

Purposes of Program Implementation

Define the length of an overall span with typical project of supports, portals, etc. defined by the line designer.

clearance

L

overall

Slide8

Purposes of Program Implementation

Calculate weight per unit length and equivalent loads on wires, cords, cables, in order to use these calculations

to define the loads influencing the supports.

ветер

гололед

температура

Temperature

вес провода

Slide9

Purposes of Program Implementation

Define the settled permissible tension (stresses) in wires, cords, self-supporting cables based on sag and tension measurements on existing lines.

f

s

The sag changes at different temperatures.

Slide10

Calculate the equivalent spans based on strain sectors of the line.

l

Equivalent span — square root from the sum of cubed lengths of strain sector spans divided by the sum of the span lengths.

l

l

1

2

3

Purposes of Program Implementation

i

l

3

n

1

l

n

1

i

l

=

eq

l

3

l

3

1

2

+

l

3

l

3

3

n

+...

+

+

l

l

1

2

+

l

l

3

n

+...

+

+

l

=

eq

Slide11

Model sagging curves of the wires, cords, self-supporting cables at different temperatures.

температура

T

emperature

Purposes of Program Implementation

Slide12

Model the pattern for supports-spotting of the profile. If necessary, verify the pattern and the spotting of the supports on the profile; updating the calculation results.

Purposes of Program Implementation

Slide13

The calculation could be done for any suspended linear material

Uninsulated wire

Self-supporting cable

Cord

Insulated wire

Cable on a strand

Rope

Slide14

Program Limitations

The number of the studied spans for one calculation is 600.

L

L

L

In

spans exceeding 600m the precision of the calculation lowers

in proportion to the length of the span.

Number of spans n

up to 600

1

2

n

At L

more than 600m

the precision of the calculation lowers.

L …

3

Slide15

To take into account the external influence on wires, cords, self-supporting cables according to EIR, the source data of the program asks for climatic conditions.

Climatic Conditions

40

-50

0

-5

-5

-5

25

18

15

Example of Data Input

Slide16

The program takes into account that the basic standard loads (external influence) and coefficients depending on the type of terrain and height according to EIR tables 2.5.2 and 2.5.4 (climatic parameters specifications) are input by the user separately.

Example of Data Input

Click

Slide17

To define the reference loads according to EIR-7 there is a separate data input area for reliability coefficients for standard loads.

Slide18

To keep the data of wires, cords, self-supporting cables, the program has an editable reference catalog (Create, Delete, Edit)

Click

Slide19

To keep the data of wires, cords, self-supporting cables, the program has an editable reference catalog (Create, Delete,

Edit)

Slide20

To keep the data of wires, cords, self-supporting cables, the program has an editable reference catalog (Create, Delete,

Edit)

Slide21

Uninsulated wires’ and cords’ characteristics are input according to National Standard, Technical Conditions and EIR; data on self-supported insulated cables are asked for at their manufacturer or according to technical conditions and EIR

.

Example of Data Input

Slide22

To calculate the spans the source data ask for minimal and maximal length of calculated spans and pitch (from 1m) for a span length’s change in this diapason.

10

400

10

13,5

9

Расчетные данные

Example of Data Input

AC120/19

Slide23

Example of Data Input

When the data on the clearance and equivalent spans are

being verified,

the calculation is performed for span length pitch of 1 meter.

The initial calculation is performed for possible spans’ diapason with pitch of the span length increase of 5-10-25 meters for preliminary assessment of the clearances over the ground at the given heights of wire attachment.

Pitch for spanlength increase

5

10

25

1

Slide24

Select Calculation Modes

Calculations’ result

are

stresses, tension

in the wire, cord, self-supporting cable material, sag for defined spans are input at reference load/clearance/mounting and other modes.

Slide25

16. Mounting. No wind, no ice, temperature -20ºС.

1. Wind with ice, ice, ice-with-wind temperature.

2. No wind, ice, temperature with ice.

Maximum wind, no ice, temperature at maximum wind.

4. Mounting. Wind velocity 10 m/s, no ice, temperature -15ºС.

5. No wind, no ice, temperature +15ºС.

6. No wind, no ice, minimum temperature (the lowest).

7. No wind, no ice, maximum temperature (the highest).

8. No wind, no ice, average operating (annual) temperature.

9. Wind 0.3* Vmax, but not less than 10 m/s, no ice, temperature +15ºС.

10. For crossing railways. No wind, no ice, temperature +70ºС.

11. Mounting. No wind, no ice, temperature +30ºС.

12. Mounting. No wind, no ice, temperature +20ºС.

13. Mounting. No wind, no ice, temperature +10ºС.

14. Mounting. No wind, no ice, temperature 0ºС.

15. Mounting. No wind, no ice, temperature -10ºС.

17. Mounting. No wind, no ice, temperature -30ºС.

Calculation Modes

Slide26

“Overall” Calculation Modes

2.

No wind, ice, temperature with ice.

7.

No wind, no ice, maximum temperature (the highest).

Slide27

The height of wire attachment is usually taken depending on the needs for agreed upon supports’ constructions and mass supports of the existing overhead lines.

Complete control mechanical calculation should be performed for the selected permissible tension (stress) in

LineMech program.

The selected permissible tension is used by the programs further on for calculating crossing and mounting stresses and sag of the wire, cord, where it could be additionally controlled and taken into account.

Climatic Conditions

Reference data

Permissible tension

Calculation Results

Slide28

For patterns

:

For curves

:

The line designer is offered all he needs to create supports-spotting patterns and sagging curves, and asked, depending on his choice, to enter the following data:

Reserve

Size of overall (equivalent) span

Height of the lowest wire

Required clearance

Desired scale

Mode (ice or highest temperature)

Scale

Span size

Temperature

(no ice)

Supports-Spotting Patterns

Sagging Curves

 

The program performs calculation of the tension in the wire, cord, self-supporting cable material at the selected mode, to model the supports’ spotting pattern or sagging curve for the given overall and equivalent spans.

Slide29

The sagging curves are used to assess the clearances at crossings at different temperatures and insulator strings’ resistance, as well as the efforts on leveling when mounting the wires on pin insulators and cables in suspension terminals at lowest temperatures.

The

preliminary

initial spotting of the supports on the profile is done with the help of the pattern.

Slide30

y=

g

1

c

2

2s

=k

ш

c

100

2

Modeling the sagging curve for a wire

:

y

Input the values for

Х

and

У

for a given scale and model the sagging curve for the wire.

A similar example is given on our site

http

://www.linecross.ru/shablon.htm

Sagging curve

o

f a wire

-

equivalent load

(

see calculation results

)

1

–

tension in wire

(see calculation results)

c

According to the calculation results, the user selects the largest sag and the required span (supports-spotting pitch)

Slide31

y=

g

1

c

2

2s

=k

ш

c

100

2

Creating a pattern with the help of the wire sagging curve

:

l

1

l

2

l

3

y

h

0

h

cl

h

cl

№2

№1

Support

Support

h

-

distance from the wire’s point of attachment on the support to he ground

0

h

=

CL

+

0,5м

cl

Cl

(

clearance

)-

distance form the ground to the wire

(

according to EIR-7

)

0,5

m

–

clearance reserve

(

considering uneven ground level

)

Input the values for

Х

and

У

for a given scale and model the sagging curve for the wire.

h

-

distance from the wire to the ground

cl

A similar example is given on our site

http

://www.linecross.ru/shablon.htm

h =h +f

cl.

0

f

–

sag of the wire

Sagging curve

of the wire

Slide32

Place the same curve lower by one clearance with the reserve, and we’ll get the so called “clearance” curve.

l

1

l

2

3

y

h

0

h

cl

h

cl

№2

№1

Support

Support

Clearance curve

of the wire sagging

l

A similar example is given on our site

http

://www.linecross.ru/shablon.htm

y=

g

1

c

2

2s

=k

ш

c

100

2

Input the values for

Х

and

У

for a given scale and model the sagging curve for the wire.

Creating a pattern with the help of the wire sagging curve

:

Slide33

Place one more curve lower by the height of attachment minus the clearance with the reserve, and we’ll get the so called “ground” curve.

“Ground” curve

of the wire sagging

l

1

l

2

3

y

h

0

h

cl

h

cl

№2

№1

Support

Support

l

When spotting the supports, the “ground” curves marks the places of supports-spotting by crossing the “clearance” curve profile.

A similar example is given on our site

http

://www.linecross.ru/shablon.htm

y=

g

1

c

2

2s

=k

ш

c

100

2

Input the values for

Х

and

У

for a given scale and model the sagging curve for the wire.

Creating a pattern with the help of the wire sagging

curve

:

Slide34

The sagging curves for different temperatures (without the 2nd and the 3rd curves) could be modeled in the same way.

y=

g

1

c

2

2s

=k

ш

c

100

2

Input the values for

Х

and

У

for a given scale and model the sagging curve for the wire.

y

c

Slide35

When selecting the option “Port to AutoCad” the pattern or curve chosen from the menu is created.

Porting to

AutoCad

Click

Slide36

To avoid confusion, the program switches between different patterns and curves by activating the corresponding fields for data input.

Slide37

Do not forget to name a pattern or a curve, otherwise you could lose the data input for it.

Input the title for the pattern or curve

Slide38

The process of modeling the curves and patterns is performed whet

AutoCad is inactive. There is no need to change any settings in AutoCad itself. A standard version of AutoCad is required, except for LT, with any extensions. To model a new curve or pattern, quit and restart AutoCad.

Slide39

LineMechCad

version of the program using

AutoCAD

(

starting with

2007

version

)

models the supports-spotting patterns for further control of the supports spotting, as well as the sagging curves of the wires, cords, self-supporting cables at different temperatures for overall and equivalent spans.

Slide40

The sagging curves, necessary in spans under different conditions – clearance mode, lowest temperatures, at temperatures necessary for crossing clearance – give the overhead line

routes

’ profiles the final look.

After the initial support’s spotting, the user has an opportunity to perform the calculation for equivalent spans on strain sectors of the line route

.

Slide41

Results of Applying the Options of LineMech & LineMechCad:

- Spotting the supports on

the profile to specify the supports’ positioning and their type by crossings calculation program

LineCross & LineCrossCad

- Validating permissible stresses (tension) at different sectors of the line route; for profiles – model sagging curves of optic cable (mounted independently or using overhead line) at necessary temperatures and loads.

Slide42

The source data files and calculation results could be kept in the same folder as the program itself.

However, it would be more rational to keep them separately, along with all the projects on a server, the places (folders) being organized depending on project roles.

Slide43

When quitting the program, reading other source data, it is recommended to save the current source data file before the calculation.

Do not replace the source data file of some other project.

It is recommended to make a reserve copy.

Be attentive!

!

Slide44

The rights owner

Of

LineMech

&

LineMechCad

is

ProEnergoSoft

Ltd.

,

Ayteya

Group of Companies

Novosibirsk

tel

./

fax

:

(383) 231-12-12

231-02-13

231-21-22

218-81-40

E-mail:

 

support

@

linecross

.

ru

aist@linecross.ru

elena_dm@ngs.ru

Website

www

.

linecross

.

ru

Slide45

Program’s author

:

Ivanov

Nikolay Pavlovich Technical support: E-mail: support@unibase.ru:Leading Programmer:Kornilov Mikhail Vladimirovich