Answer: Before installing the ONAN Transformer in the basement, the following are to be considered as per Indian Electricity Rule 1956 [rules 64-d), e), f) and g)]:-
d) It may be noted that a sub-station or a switch station with apparatus having more than 2000 litres of oil shall not be located in the basement where proper oil draining arrangement cannot be provided. e) Where a sub-station or a switch station with apparatus having more than 2000 litres of oil is installed, whether in-door or out-doors, the following measures shall be taken namely:- (i) The baffle walls [of 4 Hours fire rating] shall be provided between the apparatus in the following cases:- a). single phase banks in the switch-yards of generating stations and sub-stations; b). on the consumer premises; c). where adequate clearance between the units is not available. (ii) Provisions shall be made for suitable oil soak pit and where use of more than 9000 litres of oil in any one oil tank, receptacle or chamber is involved, provision shall be made for the draining away or removal of any oil which may leak or escape from the tanks receptacles or chambers containing the same, special precautions shall be taken to prevent the spread of any fire resulting from the ignition of the oil from any cause and adequate provision shall be made for extinguishing any fire which may occur. Spare oil shall not be stored in any such sub-station or switch station. (iii) All the transformers and switchgears shall be maintained in accordance with the maintenance schedule given in the relevant code of practices of BIS and the authorised person shall keep a record thereof as required under rule 3(6). (f) (i) Without prejudice to the above measures, adequate fire protection arrangement shall be provided for quenching the fire in the apparatus; (ii) Where it is necessary to locate the sub-station / switch station in the basement following measures shall be taken:- (a) The room shall necessarily be in the first basement at the periphery of the basement; (b) The entrances to the room shall be provided with fire resisting doors of two hours fire rating. A curb (sill) of a suitable height shall be provided at the entrance in order to prevent the flow of oil from a ruptured transformer into other parts of the basement. Direct access to the transformer room shall be provided from outside. (c) The transformer shall be protected by an automatic high velocity water spray system or by carbondioxide or BCF (Bromochloro-difluromethane) or BTM (Bromo-trifluromethane) fixed installation system or Nitrogen injection and drain method. (iii) Oil filled transformers installed indoors shall not be on any floor above the ground or below the first basement. (g) Cable trenches inside the sub-stations and switch stations containing cables shall be filled with sand, pebbles or similar non-inflammable materials or completely covered with non-inflammable slabs
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Answer:
ReplyDeleteBefore installing the ONAN Transformer in the basement, the following are to be considered as per Indian Electricity Rule 1956 [rules 64-d), e), f) and g)]:-
d) It may be noted that a sub-station or a switch station with apparatus having more than 2000 litres of oil shall not be located in the basement where proper oil draining arrangement cannot be provided.
e) Where a sub-station or a switch station with apparatus having more than 2000 litres of oil is installed, whether in-door or out-doors, the following measures shall be taken namely:-
(i) The baffle walls [of 4 Hours fire rating] shall be provided between the apparatus in the following cases:-
a). single phase banks in the switch-yards of generating stations and sub-stations;
b). on the consumer premises;
c). where adequate clearance between the units is not available.
(ii) Provisions shall be made for suitable oil soak pit and where use of more than 9000 litres of oil in any one oil tank, receptacle or chamber is involved, provision shall be made for the draining away or removal of any oil which may leak or escape from the tanks receptacles or chambers
containing the same, special precautions shall be taken to prevent the spread of any fire resulting from the ignition of the oil from any cause and adequate provision shall be made for extinguishing any fire which may occur. Spare oil shall not be stored in any such sub-station or switch station.
(iii) All the transformers and switchgears shall be maintained in accordance with the maintenance schedule given in the relevant code of practices of BIS and the authorised person shall keep a record thereof as required under rule 3(6).
(f) (i) Without prejudice to the above measures, adequate fire protection arrangement shall be provided for quenching the fire in the apparatus;
(ii) Where it is necessary to locate the sub-station / switch station in the basement following measures shall be taken:-
(a) The room shall necessarily be in the first basement at the periphery of the basement;
(b) The entrances to the room shall be provided with fire resisting doors of two hours fire rating. A curb (sill) of a suitable height shall be provided at the entrance in order to prevent the flow of oil from a ruptured transformer into other parts of the basement. Direct access to the transformer room shall be provided from outside.
(c) The transformer shall be protected by an automatic high velocity water spray system or by carbondioxide or BCF (Bromochloro-difluromethane) or BTM (Bromo-trifluromethane) fixed installation system or Nitrogen injection and drain method.
(iii) Oil filled transformers installed indoors shall not be on any floor above the ground or below the first basement.
(g) Cable trenches inside the sub-stations and switch stations containing cables shall be filled with sand, pebbles or similar non-inflammable materials or completely covered with non-inflammable slabs