KARNATAKA POWER TRANSMISSION CORPORATION LIMITED

PROGRESS REPORT OF HOT LINE DIVISION, BANGALORE -

EVALUATION OF PHYSICAL

PROGRESS AND CONSEQUENTIAL FINANCIAL GAINS DUE TO

HOT LINE WORKING

STRUCTURE OF HOT LINE DIVISION THE EXECUTIVE ENGINEER HOT LINE DIVISION

HAS STATEWIDE JURISDICTION DIRECTLY REPORTING TO CHIEF ENGINEER (P&C) KPTCL,

CAUVERY BHAVAN.

Peenya Sub-Dvn., Hubli Sub-Dvn., Shimoga Sub-Dvn.,(covers BESCOM (covers GESCOM, (covers MESCOM,Area) HESCOM areas) CESCO areas)

These three Sub-Dvn., formed on 25-04-1977 and carrying out the Hot line work successfully.

EHV LINES & STATIONS COMING UNDER THE JURISDICTION OF EXECUTIVE ENGINEER HOT LINE DIVISION FOR PREVENTIVEMAINTENANCE WORKS

Sl. No

Particulars Peenya

sub-dvn.,

Shimoga sub-Dvn.,

Hubli

sub-Dvn.,

Total

I EHV Lines

a) 220 kV

b) 110 kV

c) 66 kV

1812 Ckms

330 Ckms

3502 Ckms

5644 Ckms

2194 Ckms

867 Ckms

3745 Ckms

6806 Ckms

3982 Ckms

4949 Ckms

247 Ckms

9178 Ckms

7988 Ckms

6146 Ckms

7494 Ckms

21628 Ckms

II EHV Station

a) 220 kV

b) 110 kV

c) 66 kV

23 No.s

16 No.s

217 No.s

256 No.s

11 No.s

31 No.s

108 No.s

150 No.s

24 No.s

145 No.s

13 No.s

182 No.s

58 No.s

192 No.s

338 No.s

588 No.s

EHV LINES & STATIONS COMING UNDER THE JURISDICTION OF EXECUTIVE ENGINEER HOT LINE DIVISION FOR PREVENTIVEMAINTENANCE WORKS

As on 31.03.06

Added during 06-07 As on 31.03.07

220 kV 8555.125 19.2 8574.325

110 kV 7286.06 188.28 7474.34

66 kV 7483.669 603.88 8087.549

LENGTH OF LINES IN CIRCUIT KILOMETER

STATIONS:

As on 28.08.07

220kV 60 Nos.

110 kV 229 Nos.

66 kV 380 Nos.

SUB-DIVISION STAFF AND STRENGTH

Sanctioned Posts. Peenya Sub-Dvn. Hubli Sub-Dvn. Shimoga Sub-Dvn.

Asst. Ex. Engr. El., 1 1 1

Asst. Engr. El., 2 (1 Vacant) 1 1

Hot line mech. Gr-I 2(1 Vacant) 3 3 (2 Vacant)

Hot line mech. Gr-II 6 3 (1 Vacant) 3

All the Sub-Divisions supervisory staffs are specially trained by M/s NPTI Govt. of India. This trained staff will get Hot line allowances and hot stick allowances.

HOT LINE TOOLS:

1. INSULATOR TESTING AND INSTRUMENTS (TOOLS): INSULATOR TESTER HOT LINE TESTER INSULATION TESTER FOR HOT STICKS MICRO AMPERE METER – MICRO TESTER HOT LINE TESTING OF DISC INSULATORS – ISOLOMETER TEST EQUIPEMENT FOR RUBBER GLOVES HIGH VOLTAGE DETECTIVE SUPER TESTER

2. RE-PLACEMENT OF FAULTY STRING/DISC INSULATORS TOOLS: SINGLE POLE STRAIN CARRIER TWO POLE STRAIN CARRIER INSULATOR CRADLES INSULATED HAND TOOLS GRIPALL STICKS

FRONT AND BACK YOKE UNIVERSAL STICKS HOT LINE CUM-LONG POLY DECRON AND POLY PROPELENE ROPES EPOXY LADDER SAFETY BELTS HELMETS ETC. STATIC GROUND SUSPENSION INSULATOR TOOLS HOOK ASSEMBLY DISTIBUTION STRAIN CARRIERS ADJUSTABLE STRAIN POLES ROLLER LINK STICK SPIRAL LINK STICKS STRAIN LINK STICKS LOAD HANDLING ACCESSORIES / NYLON (RATCHTE HOISTS) CHAIN RATCHET

HOISTS

3. STATION YARD P. M. W. TOOLS AND ACCESSORIES: HOT STICKS WITH FLEXIBLE SOCKETS, ACCESSORIES INSULATED HAND TOOLS, GRIP ALL CLAMP STICKS WIRE HOLDING STICK UNIVERSAL POLES SECTIONAL HOT STICKS HOT STICK WITH ALL ANGLE KOG WRENCH INSULATED OILER TIE STICKS UNIVERSAL TOOL ACCESSORIES CUTTERS TREE TRIMMERS WIRE TONGS EXTENSION ARMS TEMPORARY CONDUCTOR SUPPORTS JUMPER AND LOAD PICK UP TOOLS THERMO VISION CAMERA ROPES

HOT STICKS: Made of EPOXI- GLASS fiber Very high di-electric strength High mechanical strength Less weight EPOXI resin wound to manufacture hollow stick. Hollowed position filled

uncellular foam to prevent entry of external moisture.

THERMO VISSION SCANNER: Typical infra-red imaging radiation detection to identify hot spots Infra-red scanner converts electro-magnetic thermal energy radiation

from surface of objects in to electro video signals, this signals are amplified and transmitted

ROPE- 1) Poly propline 2) Poly decron ( With good electrical Insulator) More strength Less weight

HISTORY OF HOT LINE TOOLS

HOT LINE BEGAN IN 1913 WITH WOODEN STICKS TO CARRY OUT THE WORKS.

LIGHT WEIGHT AND STRONG TOOLS INTRODUCED IN 1937

IN MID 1950 A. B. CHANCE COMPANY AND RITZ COMPANY INTRODUCED EPOXY GLASS TOOLS AS PER IS.

NATURE OF WORKS CARRIED BY HOT LINE DIVISION.

THE HOT LINE MAINTENANCE WORK IS A HIGHLY SKILLED WORK INVOLVING LIFE RISK OF OPERATING PERSONNEL

THE WORK IS CARRIED OUT ON THE CHARGED EHV SYSTEM WITHOUT AVAILING LINE CLEAR AND

WITHOUT AFFECTING POWER SUPPLY. THERE BY AVODING LOSS OF IMAGE TO KPTCL AND

INCONVENIENCE TO PUBLIC. THUS FINACIALLY BENIFITTING KPTCL. THE NORMAL WORKS CARRIED OUT BY ADOPTING TO

LIVELINE MAINTENACE TECHNIQUE USING HOT STICK METHOD ARE.

MEASUREMENT OF CLEARANCE OF BUILDINGS/ROAD FROM EHV LINE CONDUCTORS

TESTING OF INSULATORS OF EHV LINES UNDER CHARGED CONDITION FOR IDETIFYING FAULTY INSULATORS. FAULTY INSULATORS ARE MAINLY RESPONSIBLE FOR TRIPPING OF EHV LINES DURING MONSOON AND EARLY MORNING MIST.

REPLACEMENT OF FAULTY INSULATOR STRINGS WITHOUT AVAILING LINE CLEAR.

PREVENTIVE MAINTENANCE WORKS SUCH AS TIGHTEINING OF LOOSE CONECTIONS IN THE SUB-STATIONS AND JUMPER CONNECTIONS IN EHV LINES

THERMIVISION SCANNING OF ODS OF SUB-STATIONS TO IDENTIFY HOT SPOTS. HOT SPOTS ARE DUE TO LOOSE CONTACTS AND CAUSE BREAK DOWN DURING PEAK LOAD HOURS.

PROVDING BYEPASS JUMPERS TO RED HOT SPOTS TO AVOID TOTAL BREAK DOWN OF POWER SUPPLY IN PEAK LOAD HOURS.

CAUSE OF FAILURE

1. INSULATORS a. Failure due to defective manufacturing/

life span2. CLAMPS

a. sub-standard clamps/ defectivemanufacturing/ life span

3. NUTS AND BOLTS/JOINTSa. Sub-standard types/ defective manufacturing/ improper tightening

HIGH LIGHTS OF HOT LINE WORKING

1. TOTAL POSSIBLE INTERRUPTIONS AVOIDED 534 Hrs

2. TOTAL POSSIBLE ENERGY LOSSES AVOIDED 1.17,17,278 UNITS

3. TOTAL POSSIBLE FINANCIAL LOSS AVOIDED Rs. 22,40,300/-

4. SAVINGS DUE TO HOT LINE STAFF WORKING INSTEAD OF CONTRACT AGENCIES

Rs. 22,40,300/-

5. TOTAL FINANICAL GAIN (3+4) Rs. 2,46,54,643/-

6. TOTAL EXPEDITURE ON HOT LINES DVN., 32,35,794/-

7. FINANCIAL GAIN TO EXPENDITURE RATIO (5/6) 7.62

8. NUMBER OF EMPLOYEES IN THE DIVISION 26

9. AVERAGE PRODUCTION / EMPLOYEE (5/8) 948256

IMAGE OF THE KPTCL

The advantage of working in Hot Line technique over the conventional method of maintenance by opening the circuit/lines/equipments are:

1. It minimizes the interruptions. Hence no loss in revenue.2. Maintenance can be carried out in its actual load

conditions3. Measurement of clearance of lines to ground in actual

loaded conditions4. Financial gain5. Ensuring power system stability and stable power supply

SAVE POWER, NOT TO POLE

THANK YOU