Projects
|
|
Feasibility Studies
Description of major electrical systems: (EL)
a. two incoming
b. three outgoing to feed the three step-down transformers of the
facility, 11/0.4 KV 1000KVA each
c. one outgoing feeder for the doctors’ residence substation
transformer, 250KVA
- one spare cubical for future expansion
A. The Maternity and Pediatric Hospital – Ibn Al Baladi
–normally has a reliable power system. Its primary power comes
from one utility substation owned by the Ministry of Electricity
/ Electrical Company. The facility should is fed by two feeders
(11V) from two different sources (according to codes), in case
of a loss of power on one of the primary lines feeding the
hospital.
B. The entire facility is backed up with emergency power from
two emergency generators, which have been sized to feed the
vital loads of the facility (operating theaters, emergency
lighting and others).
C. The entire facility is wired in accordance with BSI wiring
standards. These wiring standards meet the majority of codes in
the International Building Code.
D. There is concern over the availability of sufficient power to
operate the entire hospital, especially with the expanded volume
and complexity of medical equipment to provide the medical
services required of this facility. The capacities of the
existing transformers, switchgear, electrical panels,
distribution system and so on are as follows:
The power distribution system consists of the following:
- Medium voltage switchgear (11KV)
a. It consists of seven cubicles
each of 630A capacity, manually operated, as follows:
The facility has new, imported motorized circuit breaker cubicles,
not installed yet, which will be a great improvement over the
existing ones
3. Three step-down transformers of 1000KVA each 11KV/
400V; the total load of the facility is divided between two
transformers and the third feeds the machine room . The low tension
part of each transformer is connected to a bus bar system having all
the control and metering auxiliaries in addition to power factor
gears. The three bus systems are connected by bus bar couplers. In
case of failure of any of the transformers, their load can be
handled by the others. The transformers are in good condition; only
a routine test should be run to test the conductors’ insulation,
chemical and electrical tests for the oil, in addition to the tests
to be done to the control and monitoring devices.
4. One step-down transformer of 250KVA is
installed in a separate building to feed the doctors’ residence
building and its machinery room. The transformer is in good
condition; only a routine test should be run to test the conductor’s
insulation, and chemical and electrical tests for the oil, in
addition to the test to be performed to the control and monitoring
devices.
5. Two Diesel Generator sets of
810 KVA each, one in operation and the other standby. and they are
designed to feed the vital loads in the facility in the event of
main supply
6. The hospital has imported several high
voltage breaker sets to replace damaged and
inadequate existing equipment.
7. The low voltage main distribution board, LV
MDB comprises the following :
a. Two incoming feeders of 2000A circuit breakers interlocked by two
2000A generator feeders each, coupled by a 2000A circuit breaker.
b. Each of the feeders is connected to a bus bar distributing the
power all over the facility. The loads are divided in a way that all
the loads have power during normal supply but only the vital loads
will be supplied during generator operation.
c. One 2000A feeder for the operation of the mechanical room is
inter-locked with a 630A feeder from the generator to operate part
of the cooling and pumps needed for the vital areas.
The switch gear equipment is operating and in good condition but,
after more than twenty years of operation, one or more of these
pieces of equipment, circuit breakers, relays, contactors or any
other control devices could fail. The difficulty of finding genuine
spare parts, even for renovation of the facility, suggests that we
replace all this equipment to provide trouble free operation of the
facility for the coming years and meet requirements to operate the
whole service system, including the introduction of a computerized
control system (building management system).
8. Uninterrupted power supply units are
available in the facility to back up the most vital loads like
operating theaters, delivery theaters, recovery room and anesthesia;
each has its own unit and, according to maintenance staff, they are
in good condition though some off them need their batteries replaced
(new sets of batteries are available in their stores). In addition,
the hospital had imported a new mobile, large scale UPS unit of a
capacity of 750KVA; still it is a technical issue how to connect
this large scale centralized unit in a properly engineered way. In
addition, Siemens Corp. has provided 2 (two) generators, operating
capacity 1.75MVA, which are yet to be added to the hospital systems.
9. The wiring in the facility is in good
condition, conducted in an imbedded metal conduit in the walls in
most areas and clipped on the walls in areas for mechanical
equipment and workshops and over metal tray routes. They are as
follows:
a. Lighting and power outlet installations: wiring is in good
condition, in the event of facility renovation, we recommend
replacement of all fittings and switches for better operation in the
coming years. Due to the difficulty of obtaining required spare
parts for existing fittings and introducing new types of fittings to
the existing ceiling tiles, such as 60x60 cm florescent type, the
entire configuration should be replaced.
b. Telephone and data system installation: replacement of all wiring
is recommended with the most current type, like UTP cat5+ , also the
possibility of introducing a LAN network in the same conduit system
and replacing the outlets with Rj-11 type for telephones and
introducing Rj-45 for a computer network
c. Other systems installation: in general, the wiring is in good
condition and can be used for the new systems (nurse call, central
clock, fire alarm, public address and others); each system will be
discussed later and the wiring will be changed if new systems
require different wiring specifications.
10. Fire alarm system: the old system consists
of a central control and annunciating board sensing 39 zones all
over the facility. In the event the system is replaced with a
similar system in design (conventional type), there is no need to
replace the wiring system; but if it is decided to implement an
up-to-date system (addressable type), the new wiring system will be
changed according to the new design requirement.
11. Voice and data system:
a. It is necessary to replace the existing telephone exchanger PABX
with an updated system to operate a minimum 280 extensions connected
to a minimum 20 public lines, with all options and accessories
required for medical facilities. Accordingly, it will be necessary
to replace the wiring to meet the specifications of the new digital
voice and data equipment.
Back
|
