Center Break Isolator and double Break Isolator These
disconnectors are , no load switching devices which physically
isolate the lines. They are designed for horizontal outdoor
application and can also be designed for vertical installation. For
earthing and closing of switchyard portions of the installation,
the earthing switches are provided on disconnector. If required.
The following documents were referred to during the preparation of
this specification. In case of conflict, the provisions of this
specification shall take precedence. IEC 129:1975: Alternating
Current Disconnectors (Isolators) and Earthing Switches IEC
60694:2002: Common Specifications for High Voltage Switchgear and
Controlgear BS 729: Hot dip galvanized coating on iron and steel
articles IEC62271-102 Isolator (Disconnector) - a mechanical
switching device which provides, in the open position, an isolating
distance in accordance with Electrical Safety requirements. SERVICE
CONDITIONS The isolator shall be suitable for continuous operation
outdoors in tropical areas at altitudes of up to 2200m above sea
level, humidities of up to 90%, average ambient temperature of
+30ºC with a minimum of -1ºC and a maximum of +40ºC and heavy
saline conditions along the coast. 4.2. DESIGN AND CONSTRUCTION
4.2.1 The Isolator, Solid Link shall be designed and constructed in
accordance with IEC 129 and IEC 60694. 4.2.2 The isolating link
shall be of the vertical opening, designed for single phase manual
operation. It shall be easily removed and replaced by using a
portable operating rod. 4.2.3 The isolating link shall incorporate
double porcelain insulators to suit voltage requirements and
mounted on hot dipped galvanised steel under base suitable for
vertical mounting. 4.2.4 The isolating link shall be arranged so
that each unit is mounted independently on an angle bracket. It
shall be supplied complete with the angle bracket and accessories
suitable for mounting on 'U' type steel channel. The drawings to be
submitted shall indicate all the applicable mounting positions.
4.2.5 The isolator shall be designed such that in fully open
position, it shall provide adequate electrical isolation between
the contacts on each phase. It shall conform to the requirement as
single point isolation for safety. 4.2.6 All steel parts shall be
hot dip galvanized to BS 729. The minimum coating of galvanizing
required is 80 microns. 4.2.7 The solid link shall be removable
from the mounting by use of operating rod. 4.2.8 All current
carrying parts of the isolator shall be made of high conductivity
material. 4.2.9 The isolator shall be fitted with clamp connectors
for Aluminium (ACSR) conductor of Aluminium (ACSR)conductor of
up to 18.2mm diameter. The rating of the complete isolator shall be
as follows: - Rated voltage 36 kV Rated frequency 50 Hz Rated
lightning impulse withstand voltage 200 kV Rated power frequency
withstand voltage, dry 95 kV Rated normal current 400 Amps Rated
short time withstand current for 3 sec, min. 18.0 kA Minimum
creepage distance of insulators 900 mm System
Voltages132kV1System:50 Hz, 3phase2Neutral Point EarthingSolidly
EarthedEarthing Resistor3Nominal voltage of networks132kV4Highest
system voltage as defined by IEC - 38145kV5Short circuit not less
than [MVA] N/A6Short circuit and earth fault current, symmetrical
r.m.s. value not less thanN/A7Thermal short circuit current, 1
second not less than31.5 kA8Dynamic Peak current not less than80
kA9Continuously rated currents of Isolating Switches:1 600
A10Isolation Voltage according to IEC - 71 10 a- Switching
Surge withstand voltage Phase to earth 275 kV -
Longitudinal impulse component of combined test325 kV10 b-
Lightning Impulse withstand voltage 1.2/50 micro-s To
earth and between phases650kVp Across the isolating distance
of isolating switches750 kVp10 c- Test voltage at power frequency 1
minute, dry and wet (at sea
level) To earth and between phases
(r.m.s.)N/A Across the isolating distance of isolating
switchesN/A 11For the design and erection of the conductors in
the switchyard the following minimum distance shall be
observed: 11aPhasetoground [mm]1 500 11b- Phasetophase2
33011cBusbars phasetophase3 50011dHeight to live parts above
ground5 50011eHeight to live parts above ground
at service/transportation
strips
[mm]5 50011f- Lowest part of insulators above
ground [mm]3
50012Maximum temperature rise of conductorsabove ambient
temperature (45oC)40oC13Maximum wind pressure on conductors and
cylindrical objects430N/m214Maximum wind pressure on flat
surfaces820N/m215Minimum nominal creepage distance as defined in
IEC 815, Table II25 mm/kV/* January 22, 2024 19:08:37
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