cpwd electrical maintenance manual 2012
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cpwd electrical maintenance manual 2012No part of this publication, either in English or in Hindi, may be reproduced in any formor by any means, electronic or mechanical including photocopy, recording or any information storage andretrieval system, without permission, in writing, from the Director General, CPWD, New Delhi. This Maintenance Manual 2012 is prepared for the use of CPWD. However, this may be used by otherGovt. Maintenance Manual was lastly published in the year 1999. Due to changes in trends ofmaintenance system and requirement of the users, it was necessary to revise and update the presentMaintenance Manual so as to fulfil the maintenance requirements to ensure smooth and satisfactoryfunctioning of the maintenance. This self contained publication shall be of great help and guidance to the officers engaged in theMaintenance works. This manual is the combined effort of a large number of officers. The residential units and office buildings maintained by CPWD are adding regularly with the creation of the new assets. Thegigantic task of maintaining these assets is being discharged by CPWD to the satisfaction of thestake holders through its wide and established network. To help meet the challenges effectively and efficiently on maintenance front, CPWDMaintenance Manual was published last in the year 1999. Some of the initiativestaken in this regard are: The system of outsourcing of maintenance in select areas to overcome the constraint of shortageof staff has been started. The outsourcing of maintenance is being done by awarding the work of Civil,Electrical and Horticulture maintenance to a single agency, so that the allottees do not have to lodgecomplaints on separate enquires. Results of outsourcing have been found encouraging. This has made maintenance services more efficient and savedthe allottees from hassles of registering complaints in person at Service Centres. Computerizedmonitoring and feedback system has improved speed and quality of attendance of complaints.http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/dxc-d35ws-manual.xml
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New Chapter on Outsourcing on Maintenancehas been introduced incorporating nature, scope, procedure and guidelines on outsourcing. Necessarymaterials related to upgradation and e-sewa have also been included appropriately in the Manual. Though every effort has been made to incorporate all the required changes in Manual.However, if any discrepancy is found, it may be brought to the notice of Chief Engineer (CSQ). I take this opportunity to acknowledge the commendable efforts made by Er. B. B. Gupta, former Additional Director General (Training) who was entrusted the job of revision of the MaintenanceManual. I also express my thanks to entire dedicated team involved in revision of the Manual for theirvaluable contributions in finalization of the Chapters of Manual. I specially appreciate sincere effortsmade by Er. The downloadable copy of new 'CPWD Maintenance Manual - 2012' shall also be uploaded onCPWD website (www.cpwd.gov.in) and its soft copy shall be updated on annual basis to facilitateplanning and field officers of department. ANNUAL ACTION PLAN AND RATE CONTRACT SYSTEM 2.1 Annual Building Survey and Program for Repairs 7 2.2 Annual Action Plan 7 2.3 Annual Rate Contract System 83. CPWD Officers Wives Association Notable Officers Punit Kumar Vats (Director General)The Central Public Works Department, under the Ministry of Urban Development now MoHUA (Ministry of Housing and Urban Affairs), deals with buildings, roads, bridges, flyovers, complicated structures like stadiums, auditoriums, laboratories, bunkers, border fencing, border roads (hill roads), etc. CPWD came into existence in July 1854 when Lord Dalhousie established a central agency for execution of public works and set up Ajmer Provincial Division. It has now grown into a comprehensive construction management department, which provides services from project concept to completion, and maintenance management.http://www.crigroups.com/home/content/45/11775545/html/admin/uploadsxxx/dxc-d50p-manual.xmlThe regions and sub-regions are headed by Special DGs and Additional DGs respectively, while the zones in all state capitals (except a few) are headed by Chief Engineers. Nowadays, a new post of Chief Project Manager (CPM) has been created to head major prestigious projects of CPWD. CPMs are equivalent to the rank of Chief Engineers in CPWD.The motto hitherto has been: Do nothing, have nothing done, let nobody do anything. Bear any loss, let the people die of famine, let hundreds of lakhs be lost in revenue for want of water or roads, rather than do anything.In the minutes of meeting held on 12 July 1854 the Governor General resolved that a central agency be provided by creating an office of Secretary to the Government of India in Department of Public Works. The note recorded by Lord Dalhousie was as under:The Government of India shall no longer be dependent on expedients, but should be provided with a permanent and highly qualified agency to assist in the direction of this important branch of public affairs. I have, therefore, now to propose that such an agency should be provided by creating an office of the Secretary to Government of India in the Department of Public Works. The person who holds it should always be a highly qualified officer of the Corps of Engineers.”CPWD had been involved in construction of stadiums and other infrastructure requirements for Asian Games 1982 and Commonwealth Games 2010.CPWD had also constructed the Afghan Parliament Building.The Ministry of External Affairs consults CPWD with regard to construction and maintenance of the Embassy buildings abroad. Some of the important organizations are:Only top candidates in ESE get a chance to join CPWD strictly on merit basis. The apex level post in CPWD is of Director General, CPWD who also acts as technical advisor to the Government of India. Recently the Government of India has given the approval for creation of one more post of Director General (Planning). So from now onwards CPWD has two Director General Posts.With pan India presence, CPWD has been involved in construction of strategically important mega projects all over the country including border areas. CPWD is well known for quality construction and timely completion of projects following which it has huge list of successful projects and departments as well as clients which it has served.In field, an Assistant Executive Engineer heads the entire Sub-Division. After the completion of 4 years, the officer is promoted to the grade of Executive Engineer which is equivalent to the Under Secretory to Government of India. Executive Engineer is the most challenging post in CPWD as the entire burden of the project is on him.This training cell was developed into a full-fledged Training Institute at Ghaziabad which started functioning in 1995. The CPWD training Institute was renamed as National CPWD Academy in the year 2016.The main academy is located at Kamla Nehru Nagar, Hapur Road, Ghaziabad (U.P.). Regional Training Institutes are located in the four metros i.e. New Delhi, Mumbai, Kolkata and Chennai. The National CPWD Academy is located in a lush green, serene, salubrious and pollution free environment spread over 30 acres of land in Kamla Nehru Nagar, Ghaziabad nearly 6 km (3.7 mi). from Ghaziabad Railway Station, 30 km (19 mi).The academy conducts training programs, workshops, brain-storming sessions, seminars etc.The training programs are conducted in diverse streams such as Civil Engineering, Electrical and Mechanical Engineering, Architecture, IT Applications and Management Techniques. A number of new courses on Green Buildings, their rating system and certification, energy efficient buildings, conservation of heritage buildings etc.Workers Training Centres at above locations are also part of Regional Training Institutes. Workers Training Centres impart skill improvement training to workers in various trades like mason, carpenter, plumber, mali, electrician, wireman etc. (erstwhile Group D staff). The skill development courses for workers are also conducted in association with Construction Industry Development Council (CIDC). After completion of the training, certification of the workers is also done through IGNOU.Oakland, California: University of California Press. p. 105. ISBN 978-0-520-28529-3. Oakland, California: University of California Press. p. 106. ISBN 978-0-520-28529-3. Retrieved 13 August 2017. By using this site, you agree to the Terms of Use and Privacy Policy. Dealer of Law and Business books in India. Buy Books, CD's and Digital Dictionaries online. You may fill one or a combination of many fields and the result will be combination of all the search criterias. Download general specifications for electrical works.Prabhakar Singh, CE (NDZ-I) Member 6 Sh. A.S. Arora, CE(E) Trg. Member 7 Sh. S.K. Chawla, CE(E) PEWZ Member 8 Sh. A.K. Ahuja, CE, CPM, Manesar Project Member 9 Sh. Gurvinder Singh, CE (NDZ-VII) Member 10 Sh. C.K. Varma, CE(E) CSQ Member 11 Sh. Surendar Singh, DDG (Pers.) Member 12 C T E or his representative Member 13 CA (NDR), CPWD or his representative Member 14 Sh. S.P. Sakarwal, SE(E) DCEC-V Member 15 Sh. C.S. Mittal, SE(E) LCEC Member 16 Sh. Appendix I List of Indian Standards 52 - 55 12. Appendix II Model NIT (for Sub-station) 56 - 97 13. Annexure II Lay out plan of Sub-station with DG Set 116 - 116 18. Annexure V Abstracts from IS 13947 for Switchgears 120 - 127 21. The general specifications are subject to revision from time to time. These specifications do not cover sub-station installation in mines, quarries and installation of similar nature, having hazardous atmosphere. These however do not bind the NIT approving authority from incorporating better and new, technologically superior, products judiciously. 1.1.1 Related Documents These technical specification shall be read in conjunction with the standard conditions of the contract with correction slips, as are relevant for commercial aspects, as well as schedules and drawing and requirements under these specifications. In the event of any discrepancy between these specifications and inter connected documents, the technical requirements as per the contract specifications shall be followed and deemed to be having overriding value. 1.2 DEFINITIONS The definitions of terms are in accordance with relevant Indian standards. Extra Low Voltage (ELV): Not exceeding 50 Volts Low Voltage (LV): Normally exceeding 50 Volts but not exceeding 250 Volts. Medium Voltage (MV): Normally exceeding 250 V but not exceeding 650 V. High Voltage (HV): Normally exceeding 650 V but not exceeding 33 KV. Extra High Voltage (EHV): Normally exceeding 33 KV. (Source: NBC, 2005, Part-8, Section 2.1.75 to 2.1.79) 1 1.3 SYSTEM ENGINEERING 1.3.1 General A sub-station installation is a combination of a number of major equipments like Transformers, High Voltage Panel, Medium Voltage (MV) Panels, Inter-connecting Cables, Bus Ducts, Protection and Metering etc.While selecting the Transformer(s) for a substation it will be desirable to provide at least one standby Transformer, so that a certain amount of redundancy is built in the system. Safety Codes and Labour Regulations In respect of all labour employed directly or indirectly on the work, the tenderer, here in after called the contractor, at his own expense will arrange for the safety provision outlined in section 9 of these specifications to comply with the statuary regulations, ISI recommendations and CPWD codes. In case of default, the department shall be at liberty to make arrangements and provide facilities as aforesaid and recover the cost from the contractor. The contractor shall provide necessary barriers warning signals and other safety measures to avoid accidents. He shall also indemnify CPWD against claims for compensation arising out of negligence in this respect. Nothing in these specifications shall be construed to relieve the contractor of his responsibility for the design, manufacture and installation of the equipment with all accessories in accordance with applicable statutory regulations and safety codes in force from the safety angle. 1.5 INFORMATIONS AND DRAWINGS TO BE SUPPLIED BY THE DEPTT. 1.5.1 Specification Drawing The tender specifications shall indicate, for a particular job, the reference drawings to help the contractor to work out the tender. The drawings shall also indicate the schematic of main connections and shall form part of the specifications. The contractor should select such equipment for installation as can be properly installed in the spaces shown in specification drawings. While no guarantee can be given minor modification required by the contractor if mentioned in the tender or intimated immediately after the receipt of tender shall be carried out if structurally possible. (ii) Cable trench, entry pipe for cable, manholes for drawing of cables, manhole covers etc.WORKS TO BE DONE BY THE CONTRACTOR In addition to supply, installation, testing and commissioning of all equipments as per schedule of work in accordance with 1.5.2 the following work shall be deemed to be included within the scope of work, to be executed by the contractor. 1.8 (i) All minor building works, such as equipments foundation if required cutting and making good holes, grouting of channels belts as required.SITE CONDITIONS All the equipments and their installation shall be suitable for the environmental conditions encountered at the location as indicated in Appendix II. 1.9 INSPECTION OF SITE AND COLLECTION OF DATA The contractor shall be deemed to have examined the tender documents, detailed specification, data etc. All components of the equipment shall have adequate factors of safety. The entire work of fabrication, assembly and installation shall conform to sound engineering practice and on the basis of “fail safe” design. The mechanical parts subject to wear and tear shall be of easily replaceable type. The construction shall be such as to facilitate ease of operation, inspection, maintenance and repairs. All apparatus shall also be designed to ensure satisfactory operation under working conditions as specified. 1.16 INSPECTION, TESTING AT MANUFACTURERS WORKS The contractor will be required to furnish such facilities as will be necessary for inspection of the equipment before dispatch at the manufacturer’s works and also for witnessing such tests, at the works, if so required by the department. The contractor shall furnish information for this purpose and will also give sufficient notice regarding the dates proposed for such test to Inspection agency. 1.17 TEST CERTIFICATE Copies of all documents for routine, acceptance and type test certificates of the equipment carried out at the manufacturers premise shall be furnished to the department alongwith supply of the equipment. 1.18 DISPATCH OF MATERIALS AND STORAGE The contractor shall commence work as soon as the drawings submitted by him are approved. The contractor should dispatch all materials to site in consultation with the department where suitable storage accommodation may be made available to him temporarily. For this purpose the programme of dispatches of materials shall be framed keeping in view the building progress so that suitable storage accommodation could be made available to the contractor. Safe custody of all machinery and equipment supplied by the contractor shall be his own responsibility till the final taking over by the CPWD. 1.19 COORDINATION WITH OTHER AGENCIES The contractor shall coordinate his work and cooperate with other agencies by exchange of all technical information like details of foundation if required, weight, over all dimensions, clearance and other technical data required for successful and proper completion of his portion of the work in relation to the work of others without 6 any reservation. No remuneration should be claimed from the department for such technical cooperation. Care shall be taken not to damage the water proofing done in the case of substations constructed below ground level. On completion of the installation, the contractor shall arrange to repair all damages to the building caused during plant installation so as to bring to the original condition. He shall also arrange to remove all unwanted waste materials from substation room and other areas used by him. 1.21 PAINTING AND PROTECTION All damages to painting during transport and installation shall be set right to the satisfaction of the department before handing over. All structural frame work for support of various items of equipment shall be given the final coat of paint of approved shade at site after erection is complete. Additional protection measures against corrosion shall be provided when installed in special environment. 1.22 TRAINING OF DEPARTMENTAL PERSONNEL The operation and maintenance staff of the CPWD shall be associated with the contractor’s personnel during the installation, testing and commissioning of the equipments. 1.23 COMPLETION DRAWING Three sets of completion drawings comprising the following shall be submitted by the contractor while handing over the installation: 1.24 (a) Equipments layout drawing(s) giving complete details of the entire equipments. (b) Electrical drawings for the entire electrical equipments showing cable sizes, equipment capacities, switch-gear’s ratings, control components, control wiring etc. (c) Schematic diagram of the entire sub-station installation. FINAL INSPECTION AND TESTING When the installation is complete, the contractor shall arrange for inspection and testing of the installation. Test results obtained shall be recorded. The installation shall not be accepted until it complies with the requirement of these Specifications. The date of taking over of the sub station shall be reckoned after its trouble free operation during the running in period. 1.26 GUARANTEE The contractor shall guarantee the entire sub-station installation as per specifications. All equipments shall be guaranteed for one year from the date of acceptance against unsatisfactory performance or break down due to defective design, manufacture and installation. The installation shall be covered by the conditions that whole installation or any part there of found defective within one year from the date of taking over shall be replaced or repaired by the contractor free of charge as decided by the department. The warranty shall cover the following:(a) Quality, strength and performance of materials used. (b) Safe mechanical and electrical stress on all parts under all specified conditions of operation. (c) Satisfactory operation during the maintenance period. (d) 1.27 Performance figures and other particulars as specified by the tenderer under schedule of guaranteed technical particulars. AFTER SALES SERVICES The contractor shall ensure adequate and prompt after sales services in the form of maintenance personnel and spares as and when required with a view to minimizing the break down period. Particular attention shall be given to ensure that all spares are easily available during the normal life of installation. 8 SECTION 2 HIGH VOLTAGE PANEL 2.1 SCOPE These specifications cover the detailed requirements for supply, installation, testing and commissioning of High Voltage Panels. 2.2 TYPE OF PANELS (a) Vacuum circuit breaker. (b) Gas filled Circuit Breaker: These breakers are new in the market and are being used for 33 KV and above in power distribution. These may be used on selective basis based on their availability, serviceability and cost. (c) Gas insulated compact Switchgears with Vacuum Circuit Breakers. These are recently introduced and may be used in cases of space crunches judiciously. However the discussions shall be limited to only Vacuum Circuit Breakers. The degree of enclosure protection shall be IP-4X. Detailed requirements shall be in accordance with the schedule of works at Appendix II. 2.3.2 Rating All panels assembled to form a board shall be suitable for the nominal operation voltage and rupturing capacity as specified. They should be rated as specified with a minimum of 630 Amps.Type test certificate for the breaking capacity of the panel shall be supplied. A circuit breaker for a given duty in service is best selected by considering the individual rated values required by load conditions and fault condition. 2.3.3 Type The HV Panel Board shall be metal clad, indoor, floor mounting, free standing type. The housing shall be of bolted construction to ensure compact and rigid structure, presenting a neat and pleasing appearance. The sheet steel used should not be less than 2 mm thick. The panels shall be bolted together to form a continuous flush front switch gear suitable for front operation of board and for extension at both ends. 2.3.5 General Design Aspects The HV panel board shall be designed such that the switchgear, instruments, relays, bus bars, small wiring etc. The carriage shall be mounted on wheels, moving on guides, designed to align correctly and allow easy movement of the circuit breaker and for removing the carriage for inspection and maintenance purposes. Vacuum interrupters shall be hermetically sealed and shall be designed for minimum contact erosion, fast recovery of dielectric strength, maintenance free vacuum interrupter, suitable for auto-reclosing. The drive mechanism shall preferably be provided with facility for pad locking at any position namely, “Service”, “Test” and “Fully Isolated”. It should be possible for testing the circuit breaker for its operation without energizing the power circuit in the “Testing” position. The contacts shall be made only after the breaker is inserted into service position. Interlocking should prevent contacts from being disconnected if circuit breaker is tried to be moved from service position. 2.4.4 General Features Single break contacts are provided in sealed vacuum interrupter. 2.4.5 Rating The circuit breakers shall be continuously rated as specified with a minimum rated current of 630 Amps. Material The bus bars shall be of high conductivity electrolytic copper rated as specified with a minimum rated current of 630 Amps. The bus bars shall be sized for carrying the rated and short circuit current without over-heating. Maximum bus bar temperature shall not exceed 95 degree C. 11 2.6 CURRENT TRANSFORMER 2.6.1 General Requirements Accommodation shall be provided in the circuit breaker panel to mount one set of three numbers dual core dual ratio CTs for metering and protection purposes. The CTs shall conform to relevant Indian Standards. The design and construction shall be robust to withstand thermal and dynamic stresses during short circuits. Secondary terminals of CTs shall be brought out suitably to a terminal block which will be easily accessible for testing and terminal connections. The protection CTs shall be of accuracy class 5 P 10 of IS 2705- Part III-1992. The metering CTs shall conform to the metering ratio and accuracy class 0.5 of IS 2705-1992 for incomer and class 1 for outgoing panels. 2.7 VOLTAGE TRANSFORMER 2.7.1 General Requirements A voltage transformer of burden not less than 100 VA and of proper ratio as specified shall be provided at the incoming panel. The accuracy class for the VT shall be class 0.5 as per IS 3156 Parts I to III for incomer and class 1 for outgoing panels. The transformer shall be of cast epoxy resin construction. In cases where tripping is fed through PT, VA burden of PT shall be suitably increased (say 200 VA) as recommended by the manufacturer depending upon the number of panels and connected controls. These should be of manual reset type. All relays shall have a LED indicator which will indicate operation for each function. It shall be possible to reset it only by manual operation. CT wiring shall be done with minimum 2.5 sq mm wires with colour code: RYB, Gray for auxiliary DC circuits and Black for auxiliary AC circuits. The wiring shall be securely fixed and neatly arranged to enable easy tracing of wires. Identification tags shall be fitted to all wire terminals to render identification easy and to facilitate checking in accordance with IS 375. Necessary terminal blocks and cable entries shall be provided for RTD relay wiring, power supply etc. 2.10 METERING INSTRUMENT, PANEL ACCESSORIES (DIGITAL) 2.10.1 Metering Energy metering shall be done either on the incomers or on the feeders as specified in Appendix II. 2.10.2 Voltage Selection Scheme Where a bus coupler is incorporated and only one incomer feeder (out of two available) is intended to be operated at a time, a VT Transfer Relay shall be incorporated to provide necessary potential for metering. This will be necessary when energy metering is done on individual feeders or where VT supply is used for trip circuits. Alternatively PTs shall be provided on both the bus sections (incomers) with individual metering on each incomer. 2.10.3 Instrument Panels The instrument panel shall form part of the housing. Relays, meters and instruments shall be mounted as per general arrangement drawings to be submitted by the tenderer. They shall be preferably of flush mounting type at a maximum height of 1800 mm. 13 2.10.4 2.11 Instrumentation (a) A voltmeter of class 1.5 accuracy as per IS 1248 shall be provided at each incomer panel, with selector switch.The entire panel board shall have a common tinned copper earth bar of suitable section with 2 earth terminals for effectively earthing metallic portion of the panels. The frame earthing of panel shall be in accordance with Section 7 of this specifications. 14 2.14 INSTALLATION The installation work shall cover assembly of panels lining up, grouting the units etc. In the case of multi panels switch boards after connecting up the bus bar all joint shall be insulated with HV insulation tape or with approved insulation compound. A common earth bar shall be run preferably at the back of the switch board connecting all the sections for connecting the earth system. Where trip supply battery is installed the unit shall be commissioned, completing initial charging of the batteries. All relay instruments and meters shall be mounted and connected with appropriate wiring. Calibration checks of units as necessary and required by the licensee like CTs, VTs Energy Meters etc.Commissioning checks and tests shall include in addition to checking of all small wiring connections, relays calibration and setting tests by secondary injection method and primary injection method. Primary injection test will be preferred for operation of relay through CTs. Before panel board is commissioned, provision of the safety namely fire extinguishers, rubber mats and danger board shall be ensured. In addition all routine megger tests shall be performed. Checks and test shall include following: (a) Operation checks and lubrication of all moving parts. (b) Interlock function checks. (c) Continuity checks of wiring, fuses etc.Conventionally oil cooled transformers were being used for electrical sub-station. However due to presence of oil for cooling of transformers, an inherent fire risk is involved in the use of oil cooled transformers. After repeated fire accidents due to burning of oil in oil cooled transformers, I.E. Rules have been amended to provide for use of only dry type transformers where a substation is planned inside the main building while oil cooled transformers can continue to be used if the sub-station is located in an independent building. There are two types of dry type transformers viz.This section provide for use of both the type of dry type transformers where individual capacity of transformer does not exceed 400 KVA. Insulation Oil Insulation oil shall conform to IS 335. Transformer oil to be supplied with initial fill of filtered oil. 3.2.3 General Requirements The transformer shall be indoor or outdoor type as specified. The MV side shall be suitable to receive bus bar trunking or MV cable inter-connection suitable for full load current of the transformer.Explosion Vent Explosion vent or pressure relief device shall be provided of sufficient size for rapid release of any pressure that may be generated within the tank and which might result in damage to the equipment. The device shall operate at a static pressure less than the hydraulic test pressure for transformer tank. Means shall be provided to prevent the ingress of moisture and of such a design to prevent gas accumulation. 3.2.10 Accommodation for Auxiliary Apparatus Where specified, such as, for restricted earth fault protection, facilities shall be provided for the mounting of a neutral current transformer. RATING AND DIAGRAM PLATES The following plates shall be fixed to Transformer in a visible position. 3.2.11 (a) A rating plate of weather proof material bearing the data specified in the appropriate clauses of IS 2026:1977.