over view of line and sub-station maintenance

8/4/2019 Over View of Line and Sub-Station Maintenance

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WELCOME TO THE

OVERVIEW OF HOT-LINE

MAINTENANCE


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Details of Hot Line Sub-Divisions in

APTRANSCO

No. of Divisions are 2

No. of Sub-Divisions are 10

1. Hyd. Division1. Metro SD

Hyd. & RR

2. Hyd. SDMedak&Mahaboobnagar

3. Kurnool SD

Kurnool & Atp4. Kadapa SD

Kadapa & Chittor

5. Ramagundam SDKnr, Nzb & Adb

6. Seetarampatnam SDKhammam &Warangal

2. Vja. Division7. Vijayawada SD

Krishna & Guntur

8. Nellore SDPrakasam & Nellore

9. Vemagiri SDEast & WestGodavari

10. Vijag SDVijayanagaram,Srikakulam & Vijag

APGENCO has one Hotlinesub-division at VTPS,Vijayawada.

Discoms are also planning toestablish Hot Line wings.

Hot Line Divisions are Headed technically by

the Chief Engineer and the Superintending Engineer /

Power Systems / Vidyuth Soudha / Hyderabad and

administration wise by the respective

zonal head the Chief Engineer / TL&SS and

circle head the Superintending Engineer / TL&SS.


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Staff Pattern in Each Sub-Division and

Benefits to HL Staff

Staff PatternEach Sub-Division is headed by one Asst. Divisional Engineer.

Under ADE there are three Assistant Engineers / Additional AssistantEngineers and

O&M staff of Foreman Gr.-I, Foreman Gr.-II, Line Inspector,Lineman, Lineman (Driver), Asst. Lineman and Junior Lineman.

BenefitsAs on date all the staff is paid 50% extra pay on starting cadre basic.

Risk Insurance for Rs. 10 Lacks per person.

Once in a year Safety items like safety shoes, safety goggles and waterbottle.


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INTRODUCTIONThe product of Electric Power is very important commodity.

Its rate of growth of demand is very high and it is increasingday by day.

Its percentage of shortage in the existing system is also veryhigh.

It is a critical element of infrastructure for economic

development and for improving the quality of life.It plays a vital role in improving the National economy andproductivity.

To meet the demand, the Government has liberalized thecompany rules.

Hence many Government and Private sectors are comingforward to Generate, Transmit and Distribute the ElectricPower in bulk quantities from one region to another regionby installing Super Thermal Power Stations, Extra HighVoltage Transmission lines and Extra High Voltage Sub-Stations.


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Need for maintenance

These Electric Power Transmission Lines and Sub-Stations have to be maintained properly for

1. un-interrupted power supply

2. system stability

3. reliable power supply

4. quality of power supply5. avoiding the forced outages

For maintenance, there are some conventionalmethods which are periodical, preventive andbreakdown.

With reference to the Hot-Line maintenance, themaintenance methods can be classified as Cold LineMaintenance and Hot Line Maintenance.


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1. Cold Line Maintenance: (Cold Line meansdeenergided Line) In this case, maintenance work will becarried out under the conditions of no current and nopotential i.e. Deenergised line. Hence it is called as Cold

Line Maintenance. .

2. Hot Line Maintenance: (Hot Line means an energizedLine) In this case, maintenance work will be carried outon live potential with out breaking the line current i.e.

Energised line. Hence it is called as Hot-LineMaintenance.

With reference to Conventional Maintenancemethods, this maintenance method comes under the

preventive maintenance.

Types of Maintenance


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Advantages of Hot-Line

Maintenance

Number of breakdowns will be reduced.

Inconvenience to the consumers will be reduced.

Interruptions will be reduced. By

Maintaining High Availability & Low Outage Rate of Lines.Free from Failure of Insulators due to Flashovers / De-capping

Damage to the equipment will be avoided and in-turnSaves the cost of the equipment.

Power system becomes more stable which otherwisemay become unstable due to failure of equipment.

with the above advantages, the Hot LineMaintenance on Transmission / Distribution lines andSub-Stations has been introduced.


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In Hot Line Maintenance the methods being used are

called as Live Line Maintenance Techniques (LLMT).

This type of maintenance works will be carried out by

observing the field & atmospheric conditions. Trained personscan only decide whether the conditions permit to work or not.

The work will be carried out by using right method and right

tool. If there is ambiguity either in technical feasibility of

work or suitability of atmospheric conditions, the work willnot be taken-up immediately. It will be postponed or informed

to the cold line wing to take-up the work in cold line in case

of emergency.

Before going to Live Line Maintenance Techniques, it

is better to discuss a brief history and development of Tools.

HOT LINE MAINTENANCE


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History & Development

1913 Ohio : First hot line tools were made with Woodensticks which were crude, bulky and difficult to handle.

1916-Atlanta : Wooden tools for some more Hot-Line works

were developed.1918-Tips tools company : Began manufacturing hot line

tools like wire tongs, tree trimmers, saddles, handtools and universal tools.

1937- Tips Tools Co. purchased by M/s. A.B. Chance Co.,

1940- With improved tools and safety, hot line maintenanceworks carried out up to 110 kv level.

1948- Mr. O.G. Anderson and Mr. N.R.Parkinson of

A.B.Chance carried out operation on 287 kv.


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History & Development

1950- Fibre Glass tools were introduced.

1954- Operation carried out on 330 kv with improved map-loccoated wooden tools.

1958 -Hot Line maintenance was introduced in India withestablishment of two Hot Line Training Centres (HLTC), one

at Bangalore and other at Ganguwal (Punjab) up to 110 kv.

1959 - A.B.Chance Epoxy glass came into existence.

1960 - Tools used on 400 kv and Bare Hand Method introduced.

1993 - Training inLLMT using Bare Hand Method on 400kvsystem was introduced.

2002 HLTC merged with National Power Training Institute.


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Hot line tools Features

Light in weight

Mechanically strong

High Dielectric strength

Ease in handling and installing


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Hot Line Tools

Wooden SticksIn the Beginning Hot Line Tools were

developed with Wooden sticks. They

have become obsolete because of theirown limitations and with the advent of

new technologies.

Hence now a days These sticks are notbeing used anymore.

They were in use in our country until 80s


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After introducing the Epoxy Glass Sticks,Wooden Sticks were eliminated and Epoxy GlassSticks are being used with attaching metallic

accessories.Epoxy Glass Sticks are made up of

thousands of epoxy glass resin impregnatedglass fiber laid lengthwise and wound on a

unicellular glass foam core, which is madeup of millions of unconnected cells filled withinert gas which inhabits moisture absorptionand condensation.

EPOXY GLASS STICKS


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Advantages of Epoxy Glass Sticks

Superior than wooden sticks Handling is easy because of light weight. Mechanically stronger

Higher insulation value (100 KV / foot) Moisture resistant.

Unaffected, due to sudden changes in Temp. oratmospheric conditions.

No effect due to chemically polluted atmosphere.

Maintenance is easy. Orange colour for easy identification


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Live Line Maintenance Techniques

Live Line Maintenance Techniques (LLMT) can beclassified into

1. Hot Stick Method (HSM)

2. Bare Hand Method (BHM)

3. Mixed of the above two methods

Originally LLM Techniques were developed to maintain theTransmission Lines, later-on the same techniques wereimplemented in sub-station maintenance also by followingcertain precautions like Safe Clearances, Hot-Line Tool

Maintenance, Training etc. Hotline works in a sub-station are to be carried out by the

trained persons only.

Hence the course was designed accordingly in HLTC, Bangaloreand named as Sub-Station Maintenance using Hot-LineTechniques.


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Hot Stick Method (HSM)

In this method theworking personnel will beat earth potential on the

tower / cross arm and willbe away from energizedconductor. He will attendthe work with insulatedsticks for replacement or

installation or tighteningor removal of any sort ofequipment in the line/sub-station.


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SAFE WORKING DISTANCES

(OSHA Stds.) #

Phase to phase Safe clearance

KV FEET METRE

11 20 0.6133 24 0.71

66 30 0.91

110 34 1.02

132 36 1.07

220 50 1.52

400 70 2.13

# Occupational Safety & Health Administration


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Safe working distances usually followed

in Hot-Line wings in APTRANSCO

Phase to

phase

Voltage

Clearance given in

OSHA std.

Followed in

APTRANSCO

Feet Mtrs Feet Mtrs

132 KV 36 1 50 1.5

220 KV 50 1.5 70 2

400 KV 70 2 90 2.5


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Bare Hand Method (BHM)

In this method the workingpersonnel will wear a conductivesuit (includes bonded shirt &pant, socks, gloves andconductive shoes) and away fromearth potential keeping safeclearances by way of an insulatedladder or insulated vehiclemounted boom bucket and thenhe will be charged to the livepotential.

Charged person will bondhimself to the live conductor andcarryout the work by taking allthe electrical and mechanicalsafety aspects.


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Bare Hand Dress or Hot Line Suit

Which consist of 75%nomex flame resistant fiberand 25% microscopic

stainless steel fiber.Shirt and pant have to bebonded properly.

Gloves, Socks and Shoesmust be conductive.

Once a person gets charged tothe line potential, he must bebonded to line with a bond.


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Mixed of the above two methods

Combination of

HSM and BHM

are used in all

the voltages by

observing the

field conditions

like clearances,atmosphere, line

crossings etc.


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Classification of Hot-Line

Maintenance Works

Hot-Line Maintenance ofTransmission Lines.

Hot-Line Maintenance of Sub-Stations.

Live line washing of insulators.

Emergency restoration system.Thermo-vision Scanning of Linesand Sub-Stations.

Detection of Punctured Insulator.


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Types of Hot-Line Maintenance works in

Transmission Lines & Sub-Stations

1. Replacement of Flashed over / Chipped

insulators


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2. Replacement of sub-standard insulators

(LPL make Insulators)

3. Replacement of polluted insulators

(Insulators near Chemical plants, Cement plants,Thermal plants (Nava Bharat) etc.)

4. Removing of extra insulators

In a cold line they could not able to replaceexact no. of disks because of various reasons,loading, traffic control etc.


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5. Addition / Removing of insulators (If a conductor is indamaged condition, the tension load has to be reducedtemporarily, to maintain the ground clearancetemporarily)

The above five operations can be carried insuspension, Pilot, Tension, V, and Double Stringtype.


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Suspension Operation (Video)


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VString Operation (Video)


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Tension Operation (Video)


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6. Replacement or Removing of defective fittingsand accessories like Arcing Horns, VibrationDampers, Spacer Clamps etc.

.Arcing Horn

Loosened and

fallen on conductor

and damaged the

portion of armour

by taking a spark,

further which may

lead damage of

conductor andbreakdown of the

line.Before Removing After Removing


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7. Measurement of clearances at railway

crossings, NH crossings etc.

8 P idi f Bi di i l t


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8. Providing of Binding or repair sleeves to

the un-wound portion of conductor.

9. Providing of By-Pass to the damaged

portion of conductor which gives both

Electrical and Mechanical strengths


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10. Replacement of damaged jumpers.


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11. Connecting of New jumpers of New bay

/ Feeder / PTR etc.


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Transformer upgraded from 100 MVA to 160 MVA 132

KV LV twin conductor jumper connection to Bus


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12. Tightening of Clamps to arrest the hot spots.


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13. Measurement of Jumper Lengths.

14. Providing of By-Pass to the Hot-Spotted Hard-

Ware


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15. Replacement of Isolator (Video)


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Live Line Washing.

Dust, chemicals and saline may get accumulated on

insulators due to nearness of cement factories, chemical

factories and proximity of sea. These accumulated particles

unless removed will cause the failure of insulator string.

In view of the non availability of line clear on major

feeders / sub-stations for cold line cleaning, live line

washing is employed.

Live line washing is one of the Hot line maintenance work

which is being implemented to clean the dust accumulated,

chemically contaminated and saline contaminated

insulators by the following methods.


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Dry Washing : In this method washing of insulators will be done by

using huge hot air along with corn husk or paddy husk with limestone

granules, which will be injected through nozzles on the insulators to

clean the contamination. This method is being used to clean the dust

and cement contaminated insulators. After completion of washing athin film of silicon compound may or may not be sprayed on the

insulators by hot spray. The periodicity of cleaning will be reduced by

applying silicon compound

Wet Washing : In this method washing of insulators will be done by

injecting high pressured de-mineralized water with conductivity lessthan 200 micro mhos, with the pressure of 600 PSI. This method is

being used to clean the dust, chemical and salt contamination which

are soluble in water. Mainly this method is being used in coastal areas.

Wet washing involves pumping de-mineralized water jet with the

help of equipment designed for this purpose only where precautionswill be taken for protecting human life.

Live Line Washing Methods


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Live Line Washing of Transmission and Distribution Lines(Video)


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Live Line Washing of Sub-Station Equipment(Video)


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Emergency Restoration system

Supply restoration by way of bypassing the

defective equipment temporarily.

Ex: 1. Bypassing of Defective isolator in aphase.

2. Tapping of supply from the live line.

M th d f ti i l i t


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Methods of noticing a complaint

Thermo vision camera senses temperature on the metallicobjects by its radiation. When there are loose contacts atthe joints such as T clamps, PG clamps and pad clamps

etc. The camera can detect the temperatures which are notvisible to naked eye.The camera helps in predictive maintenance i.e., it predictsthe upcoming problems so that we can plan and rectify theproblems.

The periodicity of scanning with thermo vision camera isapproximately 1 year for 132 KV SS and 6 months for 220KV SS and 3 months for 400 KV sub-stations. But basedon the field requirements, such as due to overloading ofsub-stations, the scanning may be done more frequently.

1. Hot-Spots can be identified in Lines and Sub-Stations by

using Thermo vision camera.


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Thermo vision Camera


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Hot Spots noticed by Thermo vision

Camera


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Status of defect based on the

temperatures noticed in Camera

Difference in temperature betweenmeasured and ambient

Status Designated as

10oC above ambient Normal

11 - 20oC above ambient Alert (Hot)

21 - 25oC above ambient Alarm (Very Hot)

> 26oC above ambient To be attended immediately (Critical)

Temperatures measured in Camera includes ambient

temperature.

This information is collected from the Technical Book

prepared by Central Board of Irrigation and Power


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Reasons for developing Hot-Spots

Over a period of time, resistance of conductor-joints increases mainly due to corrosion. Hot spotdevelops if the contact resistance increases more

than 80 micro-ohm. The contact resistance up to30 micro-ohm is considered safe.

Not proper fixing of nuts and bolts.

Loosening of nuts and bolts due to vibrations

Due to the Fault CurrentsPoor Quality of Hard-ware


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2. Testing of insulators using on-line insulator tester or

PUNCTURED INSULATOR DETECTOR (PID).

Introduction

The PID kit is used to detect the Punctured insulator discs in

the charged line condition. It consists of the three major parts

namely Field Probe, Sled and Telescopic Epoxy Glass Stick.Safety Precautions

Before using the PID ensure that the line is kept in Non-

auto mode at both ends.

Use the appropriate precautions i.e wearing of ConductiveShoes, Socks, Gloves, Safety Belt and Helmet while

performing the scanning.

Scanning shall be preferably done in a dry weather

condition.


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Before starting the scanning, ensure that the probe is in chargedcondition.

Mount the probe in the sled and then connect the Telescopic stick withthe sled arrangement.

Switch ON the [ON/OFF] button provided in the field probe.

Press the push button on the probe and place the PID Kit on theinsulator string and slide it to the start of the string (ground end).

Wait for at least 10 seconds until Long Beep.

Slide the kit to other end (ground end to conductor end) and a shortbeep sound will conform the scanning of each disc.

For Tension insulator forward and backward scanning is done and forSuspension insulator only forward scanning is done.After completion of the scanning, press the push button in probe tostore the scanned data.

Then wait for at least 5 seconds and then repeat the same procedure toscan another string.

Procedure for Testing of Insulator


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Down loading of DATA into a PC

Before down loading the DATA, the PID Software (Windowsbased) should be installed in the PC provided by Supplier.

Connect the charging cable to supply and join the RS 232 PIN tothe field probe and to the PC as shown in the inter connectiondiagram

Double click the PID icon in the Desktop and click the MoveData from probe to PC button.

Select the COM1 port and click the Get data from the probe andselect the folder where the data is to be saved.

Then press and hold the push button in the probe within 10

seconds till the data is down loaded in to the respective folder.


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Graph printing

Double click the PID icon in the Desktop and clickthe Graphics button.

Then open the down loaded PRN file from the

respective folder. Click the Print button to print the graph.

Scroll the mouse to view the next graph and to printit.

Repeat the above 2 steps to print all the graphs.

Sample Graph


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p p


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Tabulation of results and Analysis

The analyzing of the PID test results is done byusing MS EXCEL Software

The status of each disc is determined by the % DIPduring Forward and Reverse scan of the string

If the % DIP is more than 25 then it is inCRITICAL stage and if it is between 25 to 15then is in ALERT stage and less than 15 is in

IGNORE stage

General Specifications of POSITRON make PID probe


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p p

Sl. No. Parameters Specifications

01. Maximum insulators per string. 55 Nos.

02. Minimum insulators per sting. 04 Nos.

03. Maximum corona protection. 01 Million volts.

04. Minimum electrical field. 10 kV/meter.

05. Maximum memory capacity.300 strings or 15,000 readings (which ever

comes first).

06. Maximum scanning speed. 6 insulators per second.

07.Maximum time between uploading of

cumulated data.12 Days.

08. Maximum time between battery charges. 12 hours.

09. Minimum time of battery recharging. 10 hours.

10. Operating temperature range for the probe -30 C to 50 C

11. Dimensions 14 x 19 x 9

12. Weight 3.5 pounds

13. Calibration500 linear graphical units = 100 kV/meter

longitudinally

14. Size of insulator9 to 13

3 Physical observation of Insulators by


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3. Physical observation of Insulators byclimbing Tower while Patrolling Lines.

4. Physical observation of hard-ware andconductor while inspecting a Sub-Station.

After receiving the complaint from fieldstaff, the hot-line staff will plan andattend the complaint by using the abovesaid Hot-Line Maintenance Methods

accordingly.

C ti i t i H t Li


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Cautious points in Hot-Line

Maintenance

Hot-Line Maintenance work can be attended in the

presence of Current and Voltage provided that there

is no possibility of breakage of Current in that

particular portion during the time of maintenance.When ever there is a possibility of breakage of

Current, it has to be free from current flow by way

of tripping that particular feeder and the potential as

it is only.

The Hotline works will be carried only in dry

weather conditions.


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Hot Line ROPES

Natural fibre rope cannot be used for hotline

works because

Low dielectric strength.

Working load reduces to 50% after about six

months of continuous use.

Synthetic fibre ropes


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y p

Poly Dacron

1. White in colour2. Mechanically strong & durable3. Good for sliding hitches4. Dielectric strength is 110 KV / ft

Disadvantage: Elongates under heat,

Develops heat due to friction,

Strength gets affected.


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Poly Propylene

1. Smooth and Yellow in colour2. Very good dielectric strength (140 KV / ft.)3. Mechanically strong & durable

Disadvantage: Elongates under heat,Develops heat due to friction,Strength gets affected.

KNOTS IN HOT LINE OPERATION


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KNOTS IN HOT LINE OPERATION

Used for joining two ropes or rope to an object.

Should be easily tied and opened withoutdamaging the ropes.

Kind of knots: In hot lines, the following knots are beingused frequently.

Half Hitch Clove Hitch Square Knot Bowline Knot


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Tools normally used for hot line maintenance

Epoxy Glass Sticks1 Wire tong2.Tie stick3.Strain carrier poles.4.Ladders5.Grip All Stick6.Universal Sticks

7.Approach Stick8.Cradle Sticks9.Strain Link Sticks10.Measuring Stick etc.

M lli T l


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Metallic Tools

Most of the metallic accessories / tools are made up of heat treated

Aluminium alloy, which are light weight and more strength, some are with

Brass and some are with Steel.

Some metallic tools are attached permanently with epoxyglass sticks and some will be attached based on the work.

Different types of metallic tools used: Front and Back Yokes Tower Arm Yoke

Strain Carrier Pole Clamps Hand Line Pulleys Cradle Clamps Cum-a-along-clamp etc.

MAINTENANCE OF HOT LINE TOOLS


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MAINTENANCE OF HOT LINE TOOLS

1. Keep the Hot Line Tools on tarpaulin or on hot stick racks only.2. Clean all the tools with wipening cloth before every use.3. Clean all the Epoxysticks with moistureeater (Acetone)-MEK

(Methyl, Ethyl and Ketone).

4. Lubricate rotating parts by graphite powder. Do not use grease oroil5. If due to rain tools get wet, clean and dry thoroughly before using.6. In case it is broken it should be rejected. No repair of metal parts

is recommended7. Check the insulation strength of sticks with Hot Stick Tester.8. If there are any voids on the stick, fill it with epoxy glass bond and

on becoming it stiff, apply a layer of epoxy glass restorer forshining.

9. If the shining has gone, rub the stick with emery paper, clean withmoisture eater, apply a layer of epoxy glass restorer for shining.

Ladder Monitor Kit


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Ladder Monitor Kit

For EHV Micro-amp Measurement onBare-hand Equipment

The Ladder Monitor Kit is used inconnection with EHV Bare-handmaintenance procedure to detect micro-ampleakage on the ladder before it is placed intouse. This is accomplished by connecting themeter to the ladder, and taking readings as

the ladder is placed in contact with theconductor. It is recommended that readingsbe taken periodically during work progressto assure proper or optimum workingconditions which could be altered by achange in the atmosphere. The kit consists ofa 200 micro-amp scale micro-ammeter, threeclamps to effect use on a three-rail ladder, acable with clips and adapter to establishcontact, a bracket to ground and hold themeter on the structure and two dry cellbatteries. Instruction drawings for fieldassembly are also included in the kit.


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Limitations of Leakage Current

Thumb rule for calculating leakage current in

micro-amps ~ Line Voltage / 3

S.No.Line Voltage in

KV

Leakage Current in

micro-amps

Approximate value of Leakage

Current in micro-amps

1 132 44.00 45

2 220 73.33 75

3 400 133.33 135

If the value in monitor kit below the above values thenonly the person is allowed to climb, if not ladder must be

brought down and cleaned once again. Even-though no

improvement is found, it has to be kept away and sent

for lab testing.


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0 - 1 mA Cannot feel anything

1 - 8 mA Can feel but no pain

8 - 12 mA Painful but can let it go

12 - 20 mA Freeze, cannot let go

20 - 50 mA Breathing stops

50 - 200 mA Heart stops

200 and above Sever Burns

Effect of Current flow in body

S f th H t Li T l U d


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Some of the Hot Line Tools Used

Universal Tool Kit : Universal Tools are required to handle cotter keys,

Bolts and nuts, ball and socket etc.

HAND LINE HOOK : Usually it is fixed to the hand line to lock the tools and

materials, so that the tools will not fall while lifting and downing.

Shepherd Hook: Shepherd Hook is used for pulling and lifting insulator

strings. Swivel action permits it to rotate and maintain its alignment with

the insulator at all times

ADJUSTABLE INSULATOR FORKS : Used for holding and guiding the

insulator while engaging to line hard-ware.

Pin Holder : Manipulation with pins and bolts. Bolt head fits into a slot and is held tight by

spring action.

UNIVERSAL ADAPTER : It is Used for connecting universal tools at different angles. Means


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UNIVERSAL ADAPTER : It is Used for connecting universal tools at different angles. Meansthat when this adapter is mounted on a universal stick any universal tool can be set at almost any

angle to the stick.

Locating Pin : Used as a drift pin in aligning bolt holes as an aid in bolt and

pin.

Conductor Cleaning Brush : Used to clean the conductor in polluted areas

HAMMER : Used to break the insulators and wherever the impact load isrequired

CLEAR VISION MIRROR : To view the non visible objects

Ratchet Wrench : It is used for tightening of bolts.


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FOLDING Scale : Used for measurement on live line

SKINNING KNIFE : To remove the unwanted particles from live portion likerust, scales, etc.

Cotter Key Puller : used to partially withdraw a ball-socket cotter key so

that the insulator can be removed

M - Pin Pusher : Used for ball and socket insulator coupling. Straightend of the Curved end forces cotter key back into position.

COTTER KEY REMOVER : Used to remove the cotter keys

FLEXIBLE WRENCH HEAD : Used for tightening nut and bolts in anyangle


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HACK SAW : Used to cut the un-wanted things

Set off Rope Blocks : Used to take load easily

Suspension link Stick : Used to hold the conductor in the operation of

suspension string replacement

CHAIN RATCHET HOISTS : Used for loading in 400 KV operations.Normally One-Ton, Two-Ton and Three Ton Hoists are being used in Hot-

Lines

Cotter Key Installing Tool : Used for replacing cotter keys


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Universal BRUSH

To paint the live parts

To lubricate the live parts


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Cement

accumulation on

the conductor.

132 KV SS, Wadapally in Nalgonda District


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BALL SOCKET ADJUSTER

Used for adjusting Ball and Socket of Insulators

V - Type C - Type


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Designed to grasp from anyangle, and tighten byclockwise rotation of theUniversal Tool handle.

Used as a holding device forretaining bolt heads andloose hardware, adjustingarcing horns, replacingcotter keys, etc.

All Angle Pliers


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Used for engaging hot-line tools like Cum-a-along clamp, poles etc..

Grip-All Clamp stick


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Normally used for holding liveconductors

To maintain the clearances fromworking area

To transfer the conductors toknee positions.

Wire Tong

Sli d Adj t bl St i C i P l


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Sliced Adjustable Strain Carrier Pole

In this case Strain Carrier Clamps will not be used, these

poles are used mainly in 400 KV operations.

Types of Cradles


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Assembly of Tension String Operation

A bl f D bl S i O i


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Strain carrierPoles in doublestring operation

Used for relieving thestrain on Insulator

String while changinginsulators on DoubleString TensionOperation.

Assembly of Double String Operation

Suspension operation


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Strain link

sticks

Used for supportingconductor loads when

changing insulators onSuspension Strings.

Strain Carrier Pole Accessories


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Take-up Trunnions

Strain Jacks


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Capstan Hoist

Capstan Hoist isused to lift up thetools and materialsrequired for the

maintenance work.

A h S i k


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Approach Stick

This stick is used to approach

the lengthy jumpers because

when the length of the jumper

increases the discharge currentis more and it is difficult to

touch directly. Hence lengthy

jumpers will be approached

with this approach stick and

then the jumper will behandled further.

Some of the defects Experienced


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Scaffolding Operation


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g p

Private Work Carried at Spectrum


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Hot Line Tools will be carried in a


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specially designed vehicle

Energy Saving


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gy g

By carrying out such works Hotline crew are saving lot ofrevenue to the department. Energy saving is calculated as follows.

Cost of 1 unit is considered as Rs. 2.27 /-

Cost of 1 unit in Lacks = Rs. 2.27 / 105

Cost of 1 MU (106 Units )in Lacks = Rs. (2.27 / 105) X 106

Cost of 1 M unit = Rs. 22.7 Lacks

Saving in Rs in Lacks = No. of M units X 22.7Saving in Rs in Lacks = Load in MW X Time of operation X 22.7

In addition to the departmental works, APTRANSCO has alsorendered their services to the external agencies like NTPCRamagundam, Visakhapatnam Steel project, Spectrum and MidhaniHyderabad.


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Sample Saving

SAMPLE PICKED UP FROM HOT-LINES PROGRESS REPORT of HLSD, MC, HYD. from the month of April - 2009

Name of the Hot-Lines Sub-Division: Metro Circle, Hyderabad

S.No Date Name of the SS / LineType of

WorkLocation Details of Works

Load

in

MW

No.

Of

hour

s

M.U.

Saved

Revenue

Saved

in Lakhs

of Rs.

1 2/4/09220 KV Ghapapur to

Malkaram Feeder-I

BHM &

HSMLine

LOC No. 15 near Ghanapur

Railway Crossing double string

cut point Top phase LPL disc

Insulator strings replaced.

180 5 0.90 20.43

2 14/4/09220 KV SS Chandrayana

Gutta

Scanning SS

Thermovision Scanning of

220 KV SS Chandrayana Gutta

carried out.

_ _ _ _

Total M.U and Revenue in Lacks of Rs. saved 0.90 20.43


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Saving in one year (200809)

Performance Report of Hot Line Sub-division Metro Circle, Hyderabad for the financial year 2008 - 09

SI.No. Month HSM BHT Scanning OTHTotal

Operations

EnergySavedin MU

Revenue Saved in

Lakhs of Rs.

1 Apr, 2008 4 11 2 3 20 7.08 160.72

2 May, 2008 18 15 1 - 34 6.99 158.67

3 Jun, 2008 10 28 4 - 42 9.45 214.52

4 Jul, 2008 5 29 4 - 38 8.77 199.12

5 Aug, 2008 5 9 7 1 22 1.58 35.84

6 Sep, 2008 8 14 1 - 23 5.22 118.52

7 Oct, 2008 8 11 3 1 23 4.43 100.45

8 Nov, 2008 7 9 9 - 25 3.79 86.06

9 Dec, 2008 17 5 8 1 31 8.22186.48

10 Jan, 2009 13 30 4 - 47 15.31 347.51

11 Feb, 2009 5 14 5 - 24 5.43 123.31

12 Mar, 2009 13 14 11 - 38 7.71 174.97

Total 113 189 59 6 367 83.97 1906.16

Graphical Representation of Progress


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p p g

0

5

10

15

20

25

30

35

40

45

50

Apr,

2008

May,

2008

Jun,

2008

Jul,

2008

Aug,

2008

Sep,

2008

Oct,

2008

Nov,

2008

Dec,

2008

Jan,

2009

Feb,

2009

Mar,

2009

HSM

BHT

Scanning

OTH

Total Operations

Energy Saved in MU

Courses offered in Hot-Lines


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Training Centre

Hotline works are to be carried out by the trainedpersons only.

There are basically four types of training.1. Hot stick method (3 Months).

2. Bare-hand method (1 Month).3. Live line washing (1 Month).

4. Sub-Station Maintenance (1 Month).

There is only one training institute, HotlineTraining Centre (HLTC) in south Asia which islocated at Bangalore.


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over view of line and sub-station maintenance

Documents