Transmission Lines | Tower Testing

#transmissionline #highvoltage
Watch in HD how Prototype of Towers are tested at Testing Station
1. What is Tower Testing Station?
A tower testing station is a special plant for testing various designs of towers for transmission lines
2. A tower testing station comprised of
#ATowerTestBed
#RemoteControlLoadingMechanism
#ControlRoomWithMeasuringDevice
#CalibrationOfMeasuringInstruments
#TowerCraneForVerticalErection
A. Tower Test Bed
It Includes a Test bed & Pulling Mast. Typically a highest Capacity of Tower test bed is as follows
#BaseWidth - 35m by 35m
#MaximumUpliftCapacity - 1250 T
#MaximumOverTurningMovement - 70000 T-m
#CrossArmSpread- 70 m
Transverse & Longitudinal Mast
To enable a horizontal loading on the tower to be tested, auxiliary structures are necessary. Transverse & Longitudinal Mast helps to provide horizontal load. The Height of the mast varies from different test bed to others
Typically the Height of the transverse & longitudinal mast is 90 meter
B. Remote Control Loading Mechanism
It Includes Electrically operated winches, Controlled by SCADA software & Load Measuring Device
Winches
#For Pulling in Trans. Direction- 52 nos
#For Pulling in Long. Direction- 52 nos
#For Pulling in Vertical Direction- 52 nos
Load Cells (Computerized Controlled)
#Loading Capacity- 2 ton - 125 ton
#Total Nos Required- 60 nos
C. Control Room
Control Room is equipped with
#“SCADA SOFTWARE” for auto controlling of load application and winches.
#“VIEWERS GALLERY” For display design load V/s applied load.
D. Calibration of measuring Instrument
#All the load cells required for the test needs to be calibrated prior to the tower test.
#The calibration is done against an externally calibrated UTM.
#Calibration should be done up to maximum anticipated load to be applied during testing
E. Tower Crane
In house Tower cranes are used for erecting the tower section by section
3. Test Procedure
The transmission line industry is one of the unique industries that actually test prototypes of their structures. These tests provide a higher level of structural reliability for transmission line structural systems.
At first the 3D modeling of the tower is designed then the material for the particular prototype structure is procured for fabrication.
If a proof test is ordered, it should be done on a full size prototype structure or another tower of similar design, before it is fabricated in quantity.
Ground Assembly of the prototype is done on testing bed and later on section by section is erected by in house tower crane.
Loads are applied at different points by using “steel wire rope” & “sheave pulley” on tower structure through Pulling Mast by remote controlled electric winches operated from control room. Instruments used for recording the loads are mechanical spring gauges, electrical or electronic controlled transducers. Deflection readings are taken using theodolites & scale.
When a premature failure occurs, corrective measures are taken and all failed members are replaced. The load case which caused the failure is repeated until the tower is able to support the ultimate design load
4. DEFLECTION MEASUREMENT
Deflections are recorded in the both transverse and longitudinal direction, by means of theodolite and graduated scale. Generally the deflection are measured at following points
#Center Line Of Tower Top
#Elevation of the middle cross arm level, and
#One intermediate level on the tower center line
5. Load Cases & Test Sequence
In Standard Wind cases a wind pressure of 430 Newton per Meter Square at minus one degree Celsius is considered acting on the projected areas of tower member
In High Wind cases a wind pressure of 1064 Newton per Meter Square at an everyday temperature is considered.
For Suspension, Tension and anchor tower broken wire condition are as follows
#SuspensionTower- Any One phase or ground wire broken
#TensionTower- Any Two Phase broken on same side or any one phase and ground wire broken on same side
#AnchorTower- All Phases and ground wire intact on one side and broken on other side
In High wind oblique cases a wind pressure of 1064 Newton per Meter Square at an angle of 45 degree is considered acting on projected areas of tower member
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[@PritamSingharoy]

More on:
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Enjoy Watching!

[@hemanthhariharan5105]

Very helpful video. Thank you!

[@tulsiroy6434]

Informative!

[@priyotoshbhattacharyya8866]

At 1.32m, the Pulling Mast mentioned as Transverse Mast should be reviewed to be read as Longitudinal Pulling Mast. And Vice Versa.

[@hibaqureshi1335]

great video

[@expensiveitem3911]

Informative

[@vishnuvardhan159]

Thanks 🙏 for sharing information ℹ️ .

[@PritamSingharoy]

Thanks Vishnu....

[@samirlama6567]

Nice two

[@SachinKumar-gx3qj]

Nice video ...

[@ShahinBadshahofficial]

Nice

[@yantramanob4286]

Wow

[@kalimuthum2045]

Which is the largest testing station in India?

[@PritamSingharoy]

KEC International Ltd. have largest testing station in India having capacity of testing 1200 kV tower

[@lostinnightfrost]

Howrah WB skipper

[@ShahinBadshahofficial]

gd

[@ShahinBadshahofficial]

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[@DesiITech]

Nice