TRANSMISSION M LINESHOUSE JOURNAL OF THE TATA ELECTRIC COMPANIES / • Vol.12 Nos. 9-10

SEPTEMBER-OCTOBER 1986

TATA ELECTRIC COMPANIES

C.A.PETHKAR

ALL-INDIA FISHERIES WORKSHOP

Mr. N. H. Tata, Chairman, Tata ElectricCompanies, cuts the ribbon to inauguratethe venue and the Fisheries Workshop atWalwhan. He is flanked by Mr. S. N.Ogale and Dr. C. V. Kulkarni.

A two-day Workshop on "Conservation ofMahseer resources of India", sponsoredby Tata Electric Companies, was held atthe idyllic premises of the New InspectionQuarters on the peripheral slopes of theWalwhan lake at the far end of the dam.It was attended by representatives ofthe Government of India, the StateGovernments of Maharashtra, UttarPradesh, Madhya Pradesh, Rajasthan,Haryana, Punjab and Jammu & Kashmir,and a wide cross-section of fisheriesexperts. Among these were fishery bio-logists, consultants, anglers, fish farmers,professors of aquaculture and researchscientists. The Workshop was convenedby Dr. C. V. Kulkarni, retired Director ofFisheries, Maharashtra, who has beenclosely associated with the Companies'pisci-culture project since its inception in1970. Effective and solid technical andadministrative suoDort was provided by

The Chairman, Mr. N. H. Tata, warmly congratulates Mr. S. N. Ogale,in-charge of the Walwhan Fisheries Project, for his splendid organisationand the resounding success of the workshop.

Mr. S. N. Ogale, the dedicated in-chargeof the project.Inaugurating the venue and the Workshop,Mr. N. H. Tata, Chairman of the Companiesstated that the pisciculture project wasundertaken with a two-fold objective: ameasure of ecological enrichment of thehydel lakes and an effort to rehabilitatemajor Indian carps, especially the DeccanMahseer, which had been decimated intheir natural habitat. The Workshop hadbeen convened to focus attention on theneed for urgent steps to be taken toconserve this important game fish of India,since the population had dwindled allover the country. The experience gainedand the results obtained by the Companiesat the Walwhan fish seed farm could alsobe shared with eminent fishery biologistsand environmentalists in India. He hopedthat the technical sessions would be ofinterest to them.

Mr. K. M. Gherda, Joint Managing Director,welcomed the participants and Dr. K. R.Pandit, Vice-President (S), proposed theVote of Thanks. Dr. C. V. Kulkarni outlinedthe concept of the Workshop and theneed for rehabilitation and conservationof the Mahseer by artificial propagation.Proceedings on the first day were spreadover three technical sessions, the first ofwhich was chaired by Dr. P. V. Dehadrai,Fisheries Development Commissioner,Government of India. It dealt with theprimary problem of the present fisherystatus of Mahseers including taxonomy.Dr. G. P. Dubey, retired Director ofFisheries, Madhya Pradesh, was thekeynote speaker. Drawing the attentionof the participants towards the numberof multi-purpose dams being constructed .across several streams, he spoke on theiradverse effect on the breeding migrationsof Mahseers. He explained the different

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The cover page has been conceptualised and sketched by Mr. Chandan A. Pethkar,Trombay 'B'. He obtained the Government Diploma in Commercial Art fromSir J. J. School of Art, Bombay, and gained experience in his specialised fieldas a visualiser and illustrator for various advertising agencies. Before joining TataElectric, he worked for Murphy Radio and Bush India as an industrial designer.He is presently with the Engineering Department doing architectural designs. Priorto this, he spent 11 years in the R&D department creating industrial designs.Mr. Pethkar is well connected in the theatre world, having acted and directed playsfor Rangavan, Gossip Group and Friends Circle. He has shared the stage withnoted personalities, some of whom include Vijaya Mehta, Arvind and SulabhaDeshpande and Amol Palekar. The theatre loss is our gain.

TO ELECTRIC (• tONAVLA ^ D I S T . P 1 ' 8 '

We/coming the participants. Left to right: Mr. K. M. Gherda, Joint Managing Director,Dr. C. V. Kulkarni, Workshop Convenor, Mr. N. H. Tata, Chairman, Mr. S. P. Manaktala,Managing Director and Dr. P. V. Dehadrai, Fisheries Development Commissioner,Government of India.

river systems in Madhya Pradesh withthe help of maps and laid emphasis onthe status of Mahseer fisheries of theNarmada river and its several tributaries.Technical papers were read by Dr. KuldipKumar from Barrackpore and Mr. S. N.Ogale.

The second session covered the meteor-ological and hydrological conditionsrequired for natural spawning and thetechniques followed by our Companiesfor artificial propagation. Hypophysation(induced breeding) of Mahseer withminimum mortality and rearing of frywere elucidated by Dr. C. V. Kulkarni,the keynote speaker of this session.Chairing this session, Dr. S. N. Dwivedi,Additional Secretary, Ocean DevelopmentDepartment, Government of India, saidthat the hypophysation techniquesdeveloped at Walwhan for pond-rearedMahseer were significant steps towardsself-reliance in breeding the fish

Mr. C. B. Joshi from the Bhimtal ResearchCentre, and Mr. S. N. Ogale presentedpapers on breeding of Mahseer.

The third session examined methods ofconservation of Mahseer resourcesunder the chairmanship of Prof. K. H.Alikunhi, Fishery Consultant, Cochin.The keynote address by Dr. K. L. Sehgal,Officer on Special Duty from theNational Research Centre for Cold WaterFisheries, Allahabad, referred to thedifficulties in breeding Mahseer, hatchingof eggs and rearing of fry. Papers onconservation, protein requirements andgrowth response to pelleted feeds wereread by Dr. C. V. Kulkarni, Mr. V. Srini-vasmurthy from Vishakapatnam, Mr. G. K.Srikant and Dr. P. Keshavnath, both fromthe College of Fisheries at Mangalore.

In the field study programme, a ripe andoozing pair of Mahseer spawners werecollected from the lake and stripped byMr. S. N. Ogale in the presence of theparticipants. A stream of beautiful gold-tinged eggs were properly fertilised in an

Attentive listeners at a technical session.

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Stripping operations by Mr. S. N. Ogaleon an oozing Mahseer spawner. Visiting the hatchery tanks at the Walwhan fish seed farm.

Prof. K. H. Alikunhi and others study themovement of free-swimming Mahseer fryin a beaker of water.

enamel tray. The participants were shownthe pond-raised Mahseers of differentsizes which were successfully used forbreeding with hormone injections. Manyof them appreciated the layout of thefish seed farm which was free from theusual monotony of a series of drab tanksbecause of the well-trimmed hedgerowsand manicured lawns separating thedifferent sections of the farm. They alsoinspected the technique to achievebetter oxygenation of water in thehatchery tanks.

At the valedictory session of the Workshop,Mr. S. P. Manaktala, Managing Director,who presided over the function, reiteratedthe acceptance of a social responsibilityby the Tata Electric Companies towardsthe local population to maintain anecological balance of the surroundingsby afforestation and also by keeping thelake waters clean, as these were usedby the rural communities for potablepurposes. As a measure to keep the watersclean, the lakes were being stocked withfish and especially the Deccan Mahseerwhich had become an endangeredspecies. He hoped that the participantsfound the Workshop to be fruitful andwould enable them to rehabilitate theMahseer in their areas.

On behalf of the Government of India,Dr. P. V. Dehadrai applauded the effortsof the Companies in organising theWorkshop which had been a resoundingsuccess. The season and the environmentwere most appropriate, and participantscould happily watch the actual strippingdemonstrations which would otherwisehave required very special arrangements.He thanked the Companies for theirhospitality and all those associated withmaking their stay comfortable. Continuingin the same vein, Dr. V. D. Singh spokeon behalf of the participants and expressedhis gratitude to the Companies for givingthem an excellent opportunity to attend a

This fine specimen of Mahseer was bred at Walwhan.

Workshop wholly devoted to Mahseerstudies during which a meaningfuldialogue was conducted on its conser-vation and rehabilitation.

The conclusions and recommendationsof this Workshop are being published in aspecial issue of "Punjab Fisheries Bulletin"through the kind courtesy of Mr. B. L.Singla, Director & Warden of Fisheries,Punjab.

Since the pisciculture project wasundertaken by the Companies 16 yearsago, over 30 lakhs of fry have been raisedat the Walwhan fish seed farm whereMahseers are reared from the spawn tothe fry to the fingerling stage. There are6 cement cisterns and 33 hatchery/nurseryponds and rearing tanks at the farm:Fingerlings raised at this farm are usedfor stocking the different hydel lakes atan approximate annual rate of 1 lakh.Semi-fingerlings have also been givengratis to various State Governments(Maharashtra, Karnataka, Haryana,Himachal Pradesh, Jammu & Kashmir),angling associations and sanctuaries,research institutions and colleges. Theproject initially was geared to rehabilitatethe Deccan Mahseer, but the resultsachieved by Dr. C. V. Kulkarni and Mr. S.N. Ogale have encouraged the breedingof Bengal carps, Chinese carps and Indiantrout. Experiments are being conductedon composite/intensive fish culture aswell as for the cultivation of fresh waterprawns and their hybrids.

As part of their rural development thrust,the Companies have released fingerlingsof five fast-growing varieties of carps(Rohu, Catla, Mrigal, Cyprinus and silvercarp) into the ponds of 10 villages in theMaval taluka and 2 villages in RaigadDistrict. Over 1 lakh fingerlings areprovided every year free of cost, andadvice on their cultivation and growth is

provided by Mr. S. N. Ogale. The villageponds are harvested periodically and thesale proceeds of the fish are ploughedback for multi-directional villagedevelopment schemes. The averageproduction per village is 500-600 kg. perannum; fresh fish, a source of highprotein, is thus made available to thepopulation in the interior. At the sametime, without any financial inputs, revenueis generated in the villages for their owndevelopment.

Village boys proudly display adultMahseers harvested from the village pondsin the Maval taluka. These had beenreleased at the fingerling stage from theWalwhan fish seed farm.

ANNUAL GENERAL MEETING

The Chairman, Mr. N. H. Tata, addresses shareholders at the Companies' AnnualGeneral Meeting at Patkar Hall. Other Directors in the foreground are, left to right: Mr.M. S. Patwardhan, Mr. K. M. Gherda and Mr. S. P. Manaktala.

Welcoming shareholders to the AnnualGeneral Meeting of the Tata ElectricCompanies, the Chairman, Mr. Naval H.Tata stated that because of constantmaintenance, the old and ageing Units 1,2, 3 and 4 at the Trombay thermal powerstation are still working extremely welland the specialists from General Electric,U.S.A., have certified the 21-year oldUnit No 4 to be technically fit for anotherfive years.

The monthly Plant Load Factor for theCompanies' 500 MW Unit No. 5 averaged90% for the current calendar year.

Notices were served on the Companiesin April 1986 by the Municipal Corporationof Greater Bombay, requiring suspensionof construction work on the replacementUnit No. 6 project at Trombay. Accordingly,the piling work in progress in the boilerarea and the turbo-generator building areahad to be stopped.

The Municipal Corporation had notconveyed their approval to the projectlayout drawings submitted to them inNovember 1984. The Companies wereinformed that the Corporation had beenawaiting detailed clearance from theMaharashtra Pollution Control Board whichhad given their clearance "in principle"to the project in January 1985. Onlyafter the detailed clearance would theCorporation take up the conversion from'no development zone' to 'special industrialzone'.

After vigorous follow-up with the StateGovernment, the Maharashtra PollutionControl Board and the MunicipalCorporation over the past few months,

the detailed clearance from theMaharashtra Pollution Control Board hasbeen obtained and the MunicipalCorporation has, in accordance with therequirements, invited objections andsuggestions to the change of zone fromthe public. These objections and sugges-tions are under review and after com-pletion of formalities, it is hopedthat favourable recommendation forchange of zone will be conveyed to theGovernment. The Municipal Corporators,however, have approved that the

Municipal Commissioner should, in themeantime, permit work to be carried outin exercise of his powers under theDevelopment Control Rules, pendingminor modifications in the DevelopmentPlan, as was done for Unit No. 5.

Site construction activity, mainly piledriving and foundation work progressedduring the year 1985-86 at a good paceand substantial work both on-shoreand off-shore has been completed.Foundations below ground will be readyto receive the boiler components beforethe end of this year. By increasedmobilisation of resources for erection ofthe steam generator, it will be possible tomake up for the delays caused by noticesfrom the authorities to stop work. It ishoped that the date for completion of theproject in 1990 will be unaffected.

Some newspapers have misreported thatthe Companies were proposing to shiftthe R&D laboratory and Workshop out ofBombay to Bangalore. The Chairmanstated that there is no proposal on thepart of the management to do so, and noretrenchment or transfers are envisaged.The Workshop has been retained in thesame premises as before, and is utilisedfor the Companies' electricity utilityworks. Employment conditions of theWorkshop staff continue to remainunchanged.

A section of the shareholders at the Annual General Meeting.

The fuel position has improved with thehigher availability of associated gassince December 1985. This trend iscontinuing. However, the Companies'efforts at obtaining a favourable price forgas over and above the coal equivalentprice for the first 472 tonnes of gas perday has been the subject of discussion,and it is expected that with the help ofthe Government of Maharashtra, who arealso holding discussions with Oil andNatural Gas Commission, a satisfactorypricing formula will be forthcoming inthe next few months. The Companies'endeavour to protect the consumers willcontinue.

The 5 x 150 MW thermal power project atAI-Khobar in Saudi Arabia was success-fully completed recently. Negotiationsfor similar operation and maintenancecontracts in the Middle East are in anadvanced stage. The construction of 2 x500 MW turbo-generator units at Rihandin Uttar Pradesh in association with TataProjects Limited has commenced this year.

Energy sales to direct industrial consumers,distributing licencees and railways in theTata Electric system totalled 7069 millionunits in 1985-86. In addition, 2249 millionunits were wheeled for Maharashtra StateElectricity Board. The revenue earnedfrom power supply was:Tata Hydro : Rs. 105.75 croresAndhra Valley : Rs. 157.27 croresTata Power : Rs. 261.21 crores

While the Companies' earnings equalledthe Reasonable Return permitted underthe Electricity (Supply) Act, 1948, thedividend on Ordinary Shares has beenmaintained at 16%.

Mr. P. Abraham, Secretary (Energy) andMr. S. G. Kale, Secretary (Industries),Government of Maharashtra, have nowbeen nominated by the State Governmentas Directors on the Boards of AndhraValley Power Supply Co. Ltd. and TataPower Co. Ltd. respectively.

The venue for the Meeting this year wasPatkar Hall, New Marine Lines. Severalshareholders held an interesting andmeaningful dialogue with the Chairmanand other Directors on various aspects ofthe Companies' operations. Two personalcomputers on stage provided up-to-the-minute information and data requiredfor answering questions posed byshareholders. The electronic age inCompany Meetings has arrived.

DIVISIONAL TITBITSKALYAN

Mr. A. J. Wadhwa, Superintendent, Transmission Division, takes the salute at theIndependence Day Parade at Kalyan.

BHIVPURI

Yoga classes were conducted for a week under the auspices of the social cell of theBhivpuri division. Hour-long sessions were conducted twice a day by Mr. Govind Karifrom Yoga Vidya Niketan, Bombay. The 30 participants learnt the rudiments of posturesand exercises under his able and efficient guidance. A combined demonstration washeld on the concluding day for the benefit of the camp residents.

DHARAVI

Dharavi has recorded the second highest percentage increase in the number ofsterilisations over the last year. To felicitate those associated with the work done in thearea of Family Planning, a function was held at the receiving station. Dr. K. R. Pandit,Vice-President (S), congratulates the staff for their achievements. Others in thephotograph are, left to right: Mr. R. K. Ray, Senior Operation & Maintenance Engineer,Dr. M. D. Datye, Chief Medical Officer, Mr. K. D. Kanga, General Superintendent andMr. L. Gopalakrishnan, Senior Superintendent, Receiving Stations (South).

KHOPOLI

The Quality Circles facilitator, Mr. S. V.Dinkar, made a slide presentation tomembers of the group. Staff members atall levels were invited to familiarisethemselves with the QC movement andconcept. The group leader, Mr. Sivaguru,also discussed some QC proppsals in anopen forum at which Mr. H. L. Chowhan,Steering Committee Member, was alsopresent.

Staff members at the QC presentationmade by Mr. S. V. Dinkar at Khopoli.

Employees of the Khopoli generating station have expressed their gratitude to theManagement for a new transport facility. The gleaming 55-seater bus was inauguratedby Mr. H. L. Chowhan and Mr. B. A. Gokhale recently.

Mr. H. L. Chowhan, Superintendent,Khopoli, was the Chief Guest at theinauguration ceremony of the polytechnicbuilding, and also laid the foundation stone(above) of the new Junior College buildingat Khopoli. Officials of the KhopoliMunicipal Council and the KTSP Mandalwere also present.

POTPOURRISPOTLIGHT

Raushad, daughter of K. H. Khan, Lonavla,has passed the H.S.C. Examination witha First Class.

Rajit, son of V. Ramachandran, Trombay'B', has obtained a First Class at the S.S.C.Examination and is pursuing furtherstudies in Science at Bhavan's College,Andheri.

Shilpa, daughter of S. D. Nadkar, Lonavla,has joined the Arts stream at Don BoscoCollege, Lonavla, after passing the S.S.C.Examination with a First Class.

Nagin (alias Nandu), son of C. P. Patel,Transmission Division, has obtained hisfinal year Diploma in Electrical Engi-neering with First Class marks.

Rohit, son of D. K. Paranjape, Parel, iscontinuing his studies in Chemical Engi-neering at the University Departmentof Chemical Technology, Bombay, aftersecuring a First Class at the H.S.C.Examination.

K. K. Koli, Load Despatch Department,has been awarded his Master's degree inCommerce from Pune University.

Hrishikesh, son of V. D. Bhide, Bhivpuri,is studying for his Diploma in ElectricalEngineering at Wadia College, Pune,after obtaining a First Class at the S.S.C.Examination.

Abid AN, son of Sheikh Ismail Yakub,Salsette, has joined the Diploma Coursein Electrical Engineering at the SabooSiddick Polytechnic, Bombay. He haspassed the H.S.C. Examination with FirstClass marks.

Fareeda, daughter of M. M. Shaikh,Dharavi, has passed the S.S.C. Exami-nation with First Class marks and iscontinuing her studies in the Commercestream.

The Telec Officers' Co-operative Housing Society at Vashi.

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A route map for visitors to the residents of the Society.

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NEW HOUSING SOCIETY

The Telec Officers' Co-operative HousingSociety at Plot 30, Sector 17, Vashi, NewBombay—an employee-promoted grouphousing project-has been granted theOccupation Certificate by CIDCO Ltd. Thishas been the fulfilment of an 'ownership'dream.

The Society consists of two buildings,each having 24 flats. The buildings areprovided with one lift each and adequatefire protection systems. Constructed at atotal cost of Rs. 110 lakhs, the flatsincorporate several optional featuresoffered to the members, over and abovethe standardised package of amenities.Strict quality control stipulations and rigidstandards for RCC works and other itemshave been set by 'the ConstructionManagement Review Committee underthe Chairmanship of Mr. K. P. Battiwala,Senior Consultant. Today, these buildingsare landmarks in the prestigious Sector17 of Vashi.

This pioneering project has been followedby four more employee-promoted groupprojects in the area. Members of theSociety have recorded their gratitudefor the assistance and guidance ofthe Management in general, and toMr. S. P. Manaktala and Mr. K. M. Gherdain particular, without which their dreamcould not have been realised.

RETIREMENTS

Mr. J. I. Mascarenhas, Trombay 'A',appears to be "packed and ready to leave"on the eve of his retirement after com-pleting 35 years of service. He joined theCompanies at Lonavla and bade farewellfrom the Stores Department at Trombay.Popularly known as Jim among his col-leagues, he was known for his soft-spokenapproach and affability which endearedhim to one and all. The function waspresided over by Mr. A. Sinha, GeneralSuperintendent.

9

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Mr. Muzamil Hussain, Mr. B. S. Rane and Mr. K. Kumar, all from Distribution Divisionhave retired after logging 19 years, 35 years and 36 years of service respectively withthe Companies. A farewell function was organised in their honour at which theirdedication to duty was extolled. On behalf of their colleagues, Mr. R. P. Malhotra,Superintendent, presented retirement gifts and wished them long and happy retirementlives.

Our popular colleague, Mr. R. D.Cooper, met with a tragic, fatalaccident at Khandala on 16thAugust 1986. Rusi, a Senior Assi-stant in the Accounts Departmentat TVK, was always known for hisjoviality, exuberance and joie devivre which were almost infectious.

IN MEMORIAM

His cheerful disposition enabledhim to create a large circle of friendsnot only in his place of work, butalso in the various divisions of theCompanies.

Condolence meetings were heldat Bombay House, TVK, Dharavi,Trombay and Bhira. With deepregret and sympathies, the staffmembers conveyed their condo-lences to his bereaved family. Rusihad seen just 43 summers, outof which 26 were spent in theCompanies' service. May hisdeparted soul rest in peace.

The staff of Distribution Divisiondeeply mourn the sudden and un-timely demise of Mr. C. B. Patilwho was a draughtsman in theCable Department. He joined theCompanies in 1964 and was known

for his organised working style, hisuncanny sense of humour and hisamicable nature which enabled himto reach- out to others. He knewthe distribution network like theback of his palm and could furnishdetails of feeder routes, cable sizesand trench depths off the cuff.Our sincere condolences to hisbereaved family.

DRAMATICS

A scene from the prize-winning play "Silence! Khat/a chaloo hai!" staged by Dharavi at the one-act play competition (W86).

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Five plays were staged in the One-ActPlay Competition 1986 conducted at theCommunity Hall in the Trombay colony.There were four entries in Marathi —"Silence! Khatla chaloo hai!" (Dharavi),"Phone karnyapurvi" (Bhira), "Natak kahihot nahi" (Salsette) and "Daag" (Trombay),—and one in Hindi—"Doshi kaun"(Trombay).

The panel of judges consisting ofMrs. Radhika Pimplaskar, Mr. AnantGhogle and Mr. Appa Padwal awardedthe First Prize to the Dharavi presenta-tion while the Trombay Hindi dramasecured the Second Prize.

The Awa d for the Best Director went toMr. Dilip imat (Dharavi) while Mr. SatyajitShinde and Miss Shubhangi Javdekar(both of Dharavi) won the Best Actor andBest Actress Trophies respectively.Second prizes in these areas wereawarded to Mr. Arjinder Singh Sangotra,Mr. Nishat Deshmukh and Miss BhairaviDani, all of the Trombay Hindi play.Mr. Uday Kolwankar (Trombay), Mr. DilipGharat (Salsette) Miss Amita Shinde(Dharavi), Mr. Stanley Rose (Trombay)and Mr. Parag Lokhande (Bhira) receivedconsolation prizes.

Flashing the victory sign is the cast of "Doshi kaun" enacted by Jrombay. Standing, leftto right: Dr. (Miss) Smita Khair, Miss Vaneeta More, Miss Bharavi Dani and MissLynette Rozario. Sitting, left to right: Messrs. Ravindra Kokate, Nagesh Bhoirkar,Stanley Rose, Arjinder Singh Sangotra and Nishat Deshmukh. On the ground, leftto right: Messrs. Umakant Reddy, Rajesh Shankar, Siddappa Patil and Anil Mahajan.

ENGINEERING CORNERCONTINUOUS LINE TYPE FIRE

DETECTION SYSTEM FOR COALCONVEYORS AT TROMBAY

(by K. B. Lai, Trombay 'B')

Devastating fires have periodicallyplagued power system planners andutility managers in India, particularly inthe last few years. Even a moderate firein a power station leaves an indelibleeffect by way of loss of adjacent healthyequipment. This causes not only graveinconvenience to all consumers in termsof power supply interruptions, loadshedding, etc. but also large-scalerevenue loss by non-generation. Fireprotection therefore assumes paramountimportance in power stations.

The synchronising of the 500 MW Unit atTrombay has blazed a new trail for powerplant utilities, both in the largeness of itssize and in the use of state-of-the-arttechnologies in several sub-systems. Onesuch sub-system is the Continuous LineType Fire Detection System installed onthe coal conveyors. This system forms animportant link in the overall strategy forthe Fire Detection and Alarm Systeminstalled in Station 'B'.

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BLOCK DIAGRAM SHOWING THfc FDA SYSTEMFOR PLANT AREAS AT TROMBAY (B)

Sketch No.1

Sketch No. 1BLOCK DIAGRAM SHOWING THE FDA SYSTEM

FOR PLANT AREAS AT TROMBAY B

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Sketch No. 1 shows the block schematicdiagram of the Continuous Line FireDetection System as part of the FireDetection and Alarm System for the entireplant area. This system is basically atemperature detection system and utilisesa special fire sensor cable running abovethe conveyors. The fire sensor cableis a 4-core cable insulated with negativetemperature co-efficient compound andis connected to a control and indicationunit at one end while the other end isshorted to make two separate loops asshown in sketch no. 2.

The control and indicator units used areof two types: the Zone Master Unit (ZMU)which is the main control unit for a zonecomprising of the fire sensor cable andthe In-Zone Unit (IZU) which is connectedto every sub-section of the zone. Typically,a zone comprises of one ZMU with amaximum of 20 IZUs. The IZUs areconnected to the ZMU using 3-coreordinary cables.

Due to the characteristic of the negativetemperature co-efficient of the insulatingmaterial used, the insulation resistancebetween the two loops of the fire sensorcable (formed by shorting at the openend) decreases with the increase intemperature of the area surrounding thecable in case of fire. This is detected bythe IZU to which this cable is connectedand the alarm is triggered at a pre-setvalue. The permissible setting at the IZUvaries between 20,000 and 500,000 ohms.This allows detection of temperatures aslow as 25°C when the sensor cable lengthis 500 metres, or as high as 160°C whenthe sensor cable length is just 1 metre. Ifa long length of cable is laid, fire at anylocation along its length would also bedetected.

For example, if a cable 500 metres longis connected to an IZU with a setting of80,000 ohms, the various temperaturesat which different lengths of the cablewould initiate the fire alarm are:

Length (metres)Temperature (°C)

500 200 100 50 25 5 2 133 40 45 51 57 75 87 102

When a conveyor is running, any fire onthe conveyor would traverse along thelength and heat up a longer length ofcable within a short time span, thusinitiating an early alarm.

Like other detection systems, the systemat Trombay also has self-diagnosticfeatures. Any open wire fault on the sensorcable as well as short circuit/open circuitfault on the 3-core cables connecting theZMU with the IZUs, are detected andalarms annunciated. "Fire" and "Fault"indications are provided on the concernedIZU of the sub-zone, the ZMU, the LocalFire Control Panel (LFCP) of the area andthe Main Fire Control Panel (MFCP) inthe main control room. The IZU and MZUare provided only with visual indication,while the LFCP and MFCP have audibleas well as visual alarms. ZMUs and IZUsare each provided with key-operatedtesting facility for periodic checks bysimulating fault conditions.

However, the indication at the ZMU doesnot pinpoint the IZU which has detecteda fire. For vastly spread areas as in thecase of conveyor systems, it is better toobtain an alarm for fire in a particulararea at an inicipient stage than to arriveat a situation when fire has gutted thewhole system. At Trombay, the newconveyors for Unit 5 have been dividedinto two zones and the locations of theZMUs and IZUs have been decided tofacilitate easy and early scanning of theunits installed for various sub-zones.

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The Tariff Advisory Committee for fireinsurance (Bombay region) has also beenconvinced of the usefulness of the systemand our Companies have been allowed adiscount of 5% on the fire insurancepremium for coal conveyor systems; thisis the maximum discount permissible forproviding an effective fire alarm system.With the installation of this system whichis primarily of a preventive nature, theCompanies have maintained their traditionin ushering first-up systems in firedetection in the power engineering field.

GAS INSULATED SWITCHGEARFOR CARNAC RECEIVING STATION

The Companies will be once again in theforefront of modern technology when the220/110/33 KV receiving station at Carnacis commissioned with 245 KV and 145 KVindoor Gas Insulated Switchgear (GIS)by the end of next year. This equipmentwas ordered with Merlin & Gerin, France,against international competitive biddingand is under manufacture at Grenoble.

The Companies' system design andoperation philosophy has always placeda high emphasis on maintainability andreliability of power supply to consumersin and around Bombay city. To meet theserequirements, modern SF6 outdoor circuitbreakers were introduced in the systemfrom 1980 in a phased manner with thecommissioning of 220 KV and 110 KVMerlin & Gerin equipment. Similarbreakers at 22 KV have been installed atTrombay and Dharavi switchyards.

GIS is a further step in improving reliabilityand safety where the entire switchgear,i.e. circuit breakers, busbars, isolators,instrument transformers, lightningarresters, cable sealing ends, etc. arekept in totally enclosed aluminiumhousings insulated with SF6 gas andmaintained at safe earth potential. Thereare no live exposed parts at all, and dueto total encapsulation in SF6 gas, theoverall space requirements are reduceddrastically. GIS has been in use exten-sively in Europe, U.S.A. and Japan formajor urban load centres. Based on astudy of utility practices in these countries,the Companies have preferred a modulardesign with double busbar systems onthe 245 KV and 145 KV G IS for the Carnacreceiving station.

Some of the major advantages of GISover the conventional outdoor switchgearare:

(1) Space saving: Due to the metal clad

12

type of construction and excellentdielectric properties of SF6, there is 90%saving in space. At Carnac, it would havebeen impossible to locate outdoor 220/110KV circuit breakers in the available space.

(2) Reliability: The failure rates of GISare much lower and faults due to externalinfluences, birds, etc. are negligible.

(3) Maintainability: The SF6 circuitbreakers are virtually maintenance freeand washing/cleaning of insulators iseliminated due to metal clad enclosures.

(4) Safety: The enclosing of all live partsin earthed metallic enclosures consider-ably improves the safety factor foroperation and maintenance crews.

(5) Environment: GIS blends easily withurban areas; neither does it affect theenvironment nor is it affected by it.

The salient features of GIS being installedat the Carnac receiving station are:

(a) The 245 KV and 145 KV circuitbreakers are rated for 40 KA faultinterrupting duty.

(b) The 245 KV GIS has single phaseenclosures and the 145 KV has threephase enclosures, both using doublebusbar arrangements.

(c) The 315 MVA transformer connectionboth on 220 KV and 110 KV is madedirectly through SF6 gas insulated busducts with suitable dismantling and testingfacilities and expansion bellows.

(d) Circuit breakers, busbars, isolators,PTs and lightning arresters are installedin separate gas chambers. Each bay isdivided into a number of gas sections toensure that even with a fault on one ofthe busbars/isolators, the system couldcontinue on the second busbar.

(e) Each section is provided with specialearthing switches to facilitate maintenanceand testing.

(f) The external metallic barrier is of the"dead tank" type.

These advantages make GIS the optimumsolution for high density urban distributionnetworks due to its compactness, costeffectiveness, reliability, safety andenvironment protection.

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220 KV Gas /nsu/afec/ Switchgear installed at Cretaine near Paris. Similar equipment is being installed at the Carnac receivingstation in South Bombay.

13

SPORTS ROUND-UP

TREKKING

Members of the trekking team, from left to right: Mr. A. Hanamshet, Mr. D. Fernandes,Miss P. K. Shroff, Mr. A.'Moitra, Mr. S. K. Pande and Mr. M. S. Dave, at the Annapurnabase camp.

Six intrepid members of the TelecAdventurists' Club successfully completeda trek to Annapurna Sanctuary, nestlingin the Himalayan range across theNepal border. The team comprised ofMr. D. Fernandes (Trombay 'A') whowas the leader, Mr. M. S. Dave (BombayHouse), Mr. A. D. Hanamshet andMiss P. K. Shroff (both TVK), Mr. S. K.Pande (Trombay 'B') and Mr. A. Moitra(Engineering Department). The adventurereceived an initial setback when Mr. UdayKolwankar and Mr. Sunil Deodhar wereforced to withdraw due to illness andinjuries, but the spirit of adventure wasnot dampened.

Proceeding by rail and bus, the groupreached Pokhara none the worse after asleepless, tiring journey. The majesticMachhapuchhare towering over the townlifted their drooping spirits in the pre-dawn haze, and the members proceededto meet their host, Mr. Kishan BahadurThapa, son of Mr. Dil Bahadur Thapa whois employed at the Borivli receiving station.He provided unlimited hospitality, forwhich the group is grateful.

The 10-day trek commenced along theright bank of the river Seti, and the groupestablished camp at Dhampus, a largevillage at a height of 5500 feet. Theirnext destination was Landrung (5800 feet)

where they met and exchanged trekkingnotes with foreigners on similar missions.Then on to Chumrong, skipping acrossboulders on the Modikhola river intowhich Mr. Dave took an unscheduledtumble, but surfaced safe and sound.

As the confidence of the group increased,the members moved up to Khuldi andchecked into the Himalaya Hotel which

is situated beyond DaDang in a tinyclearance at the end of a narrow valley.To reach this haven, the membersploughed through thick bamboo forestand up the trail which rose almostvertically to Hinku. Up to now, therewas no snow. But when trekking to theMachhapuchhare base camp at 13,000feet, snowdrifts treacherously appearedthough the weather gods were kind andclear skies were forecast. Acclimatisationto the rarefied atmosphere was not easyand all the members exhibited mildsymptoms of high altitude sickness.

The path for the final approach to theAnnapurna base camp was fraught withdanger with swirling snow inhibitingprogress. As a precautionary measureagainst frostbite, the members stuffedpolythene bags into their shoes, but theydid not develop cold feet as they finallyreached the sanctuary. The beauty of theAnnapurna sanctuary is indescribable;massive peaks surround the area andseem within handshaking distance.The snow white crowns of Huinchuli,Gangapurna, Annapurna I, II and III,Annapurna South and Machhapuchharestand out in relief against the azure sky,silent sentinels reaching out into the bluebeyond. Delicate fleecy clouds play hide-and-seek with the rays of the sun as theyfloat in various hues of gold. The groupexperienced a sense of timelessness aswell as that awful feeling of insignificanceas compared to Nature.

Crossing a suspension bridge seems an easy manoeuvre.

14

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THE TREK TRACK

On the return circuit, the trek continuedvia Kyumnu Khola to Ghandrung andChandrakot, then down to Suikhet andback to Pokhara. It took 10 days during

The Companies' team at the All-IndiaElectricity Sports Control Board Table-Tennis Tournament. Left to right:Messrs. Chandrashekar Ganapathy,Mahindra Mohite, Ajit Dos/7/, H. B. Thakurand Satish Ganapathy (Manager).

^ISHY ro

which physical discomforts were temperedby the satisfaction of communing withNature. It strengthened team spirit andpromoted the sharing of joys and sorrows,failures and successes, and proved tobe a thrilling experience in adventure.

(Condensed from a report on the highaltitude trek prepared jointly by themembers of the group. Readers can charttheir route in the trek track — Editor.'}

TABLE-TENNIS

The XIV All-India Electricity SportsControl Board Table-Tennis Tournamentwas organised at Vadodara by GujaratElectricity Board. 12 teams from variousElectricity Boards in India and otherutilities participated in the Tournamentwhich was declared open by Mr. M. Siva-gnanam, Chairman, Gujarat ElectricityBoard.

In the league matches, Tata ElectricCompanies defeated Tamil Nadu Electri-city Board and Andhra Pradesh State

Electricity Board to qualify for the knock-out stage. In the semi-finals, Haryana StateElectricity Board (who emerged the teamchampions) beat Tata Electric, but thelatter received consolation by routing UttarPradesh State Electricity Board to claimthe third spot in the overall placings. Inthe individual events, our Companies'representatives bowed out in the fourthand fifth rounds.

Mr. Nalinbhai Patel, Minister of State forEnergy, distributed the prizes to thevarious winners.

CRICKET

The prize distribution function of "TheTimes of India" Challenge Shield CricketTournament was held at Hotel OberoiTowers this year. The function at thechandeliered Regal Room as glitteringas always, was made noteworthy by thepresence of Mr. Jamshed Kanga, theformer Municipal Commissioner, andMr. Kazuo Haruna, President, MarubeniCorporation, Japan. The Consul for Japan,Mr Uchida and the General Manager ofMarubeni, Mr. Sasaki, were also present.

Welcoming the gathering, Dr. R. S.Tarneja, Managing Director, Bennett,Coleman & Co., proprietors of the "Times"group of newspapers, pointed out thatMr. Haruna, the Chief Guest at thefunction, was a stalwart from Japan whosesense of belonging to Marubeni could beseen from his association with the Corpo-ration in a career spanning 46 years.

Presiding over the function, Mr. Kangadeclared that any function that takes place56 times in 56 years becomes historicand permanent. In this egalitarian age,he said, the commercial houses have takenthe initiative of sponsoring various sportsand the "Times of India" cricket tourna-

15

Mr. Kazuo Haruna presents the "Times ofIndia" Cricket Tournament Shields toMr. Stanley Saldanha, Captain of theCompanies' 'A' team (above) and Mr.Bharat Nadkarni, Captain of our 'B' team(below).

ment has established a unique record.Like the population of Bombay city, heobserved that the number of entries inthe various divisions of the tournamentwas also increasing year after year.

In a rare double, our Companies' 'A' teamwon the 'C' Division Shield and the 'B'team received the 'E' Division Shield inthe same year. The respective captains,Mr. Stanley Saldanha and Mr. BharatNadkarni, received the trophies fromMr. Haruna.

While cricket is not very popular in Japan,it is really a simple game. There are twosides, one out in the field and one in thepavilion. Each player in the side that is ingoes out, and when he is out he comesin, and the next man goes in until he isout. Then, when all the eleven playershave been in and are all out, the side that

has been out in the field comes in, andthe side that has been in goes out andtries to get out those coming in. Some-times, there are players still in and notout. Then, when both sides have been in

and out, including not outs—and thishappens in two innings—that is the endof the game. Sometimes though, the gamehas stumped the spectators. Cricket, lovelycricket!

Members of the victorious cricket teams with Dr. and Mrs. K. R. Pandit, Vice-President(S) and Mr. M. V. Rao, General Manager.

Inter-divisional cricket champions—the Trombay 'A' team, from left to right: (sitting),Messrs S. S. Pa/, G. Shridharan, S. D. Bedekar (Manager), N. K. Vengsarkar (Captain),H. B. Thakur, K. Suresh and S. B. Kale, and flanked by the umpires (standing), MessrsH. P. Deshpande, P. H. Nagwekar, S. M. Tole, Peter Noronha, Prakash Kadam, A. M.Taware, A. Martin and V. B. Tambe.

CARROM

Mrs. Nari Contractor presents the winners'

trophy in the All Parsi Carrom Doubles

Tournament 1986 conducted by Sir Ratan

Tata Welfare Centre, Bombay, to

Mr. S. D. Cooper, Civil Construction

Department, Dharavi, and his partner

Mr. K. G. Katrak.

16

CONTRIBUTIONSFROM MY SCRAPBOOK

(by K. D. Kanga, Dharavi)

"Dhar-avi, Dhar-avi! Relieve load!" Shriekswere heard on the wonderphones and anold shift engineer, apparently mute andsilent at the control desk, sprang up likea coiled spring, pulling control switchesof the feeder panels where 'HOLD' tagswere not exhibited. Boom! Bang! Anumber of OCBs of feeder H6 or H25were being opened out in a sequencewhich only he knew. He was sorry forthose consumers who got a shutdown,but he could not help it. His eyes wereconstantly watching one meter, the fre-quency meter, on the control panel. Withinminutes, he completed the operation torestore the frequency to normal and smiledsatisfactorily at his own action, keepinghimself alert for further orders.

That was in 1950; I was a new entrant inthe Testing Department and had justbegun moving out to the divisions onoutdoor work. I was amazed at the loadrelieving shreiks on the wonderphonesand the fast sequence of operations. Theold shift engineer beningly explained inhis characteristic Parsi language, "Dhar-avi—unexpected trouble (dhad) came(avi)". As I became acquainted with theshift personnel at this receiving station,they told me that the shift engineer wouldresent the smallest change in the station;he wanted complete quiet and normalworking in the shift. I learnt this wasindeed true, for when I had to do routinetesting work, he would greet me with theassurance that everything was normal andthat there was no need to poke my fingersunnecessarily anywhere. Years later, heretired without being bothered by anychanges in the receiving station.

With my transfer to Trombay in 1958, Iwas not able to see the modernisation ofDharavi receiving station and it was onlyon my return here in 1966 that I saw thechanged scenario. Low rated 100 KVOCBs were replaced by high-rupturingcapacity Oerlikon OCBs and later by ASEAand TMG ABCBs. An old 12.5 MVARcondenser was replaced by a newSiemens 25 MVAR condenser and anotherwas added later. The entire control roomwas moved as if on a magic carpet to adifferent location in clean, airconditionedcomfort with new ASEA control panelsoverlooking the beautifully laid out 100 KVswitchyard where fine lawns flourish inplace of the weeds of yesteryear.

The eld H6 and H25 22 KV breakershave been replaced by 30/20 KV BrownBoveri air" blast switchgear. Old trans-formers have been retired and replacedby 60 MVA English Electric and Toshibatransformers. A new housing colony hasbeen built in the front compound withmodern amenities and facilities for staffwelfare. There is a new office building infront of which colourful flower beds circleand complement the green lawn.

With the addition of automatic loadshedding equipment, shift engineers arenot required to spring up and pull switches.This is done automatically and in thetwinkling of an eye. The new ABCBs boomlike cannons echoing "Dhar-avi, Dhar-avi" and load is relieved.

MEMORY GARDEN

(by S. V. Dinkar, Khopoli)

A few months ago, I read an article whichstated that an institution in Delhi hadpurchased a plot of land from the MunicipalCorporation and had floated a scheme ofplanting a tree by individuals in memoryof some occasion. This novel idea is reallyattractive as a tree can be planted on anyauspicious event by an individual; it helpsto create a bond and a personal attachmentfor its nurturing and growth. In thesedays of living in flats, there is hardly anopportunity to tend plants and flowers on

account of space limitations. Planting apersonal tree on the occasion of a familybirth, marriage or anniversary offers aspecial motivation to take care of its growthand can be part of the overall campaignto "grow more trees".

Seized with this idea, I approached Mr.H. L. Chowhan, Superintendent, with thesuggestion that every employee shouldplant a tree on the day of his retirementfrom the Companies at the time of hisfarewell function. Accordingly, a plot ofland in the premises has been namedMemory Garden (Smruti Baug) and allretirees will henceforth plant a sapling inthis Garden. A metal plate bearing hisname and date of retirement will be placednear the sapling. The first saplings atKhopoli have been planted by Messrs. S.D. Shelke, Mohan Soma and MarutiGanpat.

This scheme can be extended to otherdivisions as well, where similar MemoryGardens can be laid out in a special area.Varieties of trees can be planted by retiringemployees and the saplings can beobtained from our own nurseries underadvice from our horticulturists. Years later,in addition to giving a sense of pride andbelonging to the individual, the Gardencan be utilised for divisional functions,e.g. Safety Day, prize distribution cere-money, etc. Any takers?

Mr. Mohan Soma (second from left) plants a sapling in the Memory Garden at Khopolion the eve of his retirement from the Companies.

17

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22

PHOTO CORNER

The Brahma Kamal is rare and its uniquepeculiarity is that it blooms during thenight. It has been captured by Mr. S. M.Padwalkar, Bhira, after keeping vigil formany nights.

From the Nature Album ofMr. Abdul Salam,Khopoli.

Reticulation at Horniman Circle.contributed byMr. K. D. Kanga, Dharavi.

23

An unfettered sunset in glorious chains! An apparent contradiction taken by Mr. Prasad Karnik, Trombay 'A', at VrindavanGardens, Mysore.

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Siesta after a leonine meal. Clicked by Mr. S. V. Dinkar, Khopoli, at Trivandrum zoo.

[The views expressed in this Journal are not necessarily those of the Management of the Tata Electric Companies)Published by Col. G. P. S. Dhillon for Tata Electric Companies, Bombay House, Homi Mody Street, Bombay 400-001, and

printed by him at TATA PRESS Limited, 414, Veer Savarkar Marg, Bombay 400025, for private circulation only.Editor Mr. Vivian Miranda, Editorial Assistants (for Marathi section) Mr. Sanjay Salvi and Mr. Sudhir Bhave.

Regn. No. 22899/75