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.
1 The Isolator, Solid Link shall be designed and constructed in accordance with IEC 129 and IEC 60694.
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.
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 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.
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.
6 All steel parts shall be hot dip galvanized to BS 729. The minimum coating of galvanizing required is 80 microns.
7 The solid link shall be removable from the mounting by use of operating rod.
8 All current carrying parts of the isolator shall be made of high conductivity material.
9 The isolator shall be fitted with clamp connectors for Aluminium (ACSR) conductor of Aluminium (ACSR)conductor of up to 18.2mm diameter.
|1||Description||Solid link assembly complete with link|
rated at 200A and mounting bracket to PIESA 002. (See Figure 1 to Figure 12 below)
|2||System conditions of service|
a) nominal Voltage (Un) r.m.s
|b) maximum system voltage (Um) r.m.s||KV||12|
|c) earthing||Effective & non effective|
|3||Site conditions of service|
|b) Operating Ambient temperature||°C||-1 to 40|
|a) Nominal voltage||kV||11|
|b) Rated current||Solid link||A||200|
|Cut out base||A||200|
|a) Insulator material specification||Porcelain|
|Lightning impulse withstand (1.2/50)||kV||95|
|Power frequency wet withstand voltage|
|6||Specific creepage distance||mm/kV||25|
|7||General information to be provided|
Drawings and brochures showing outline and general arrangement
|b) Detailed drawings of all items|
showing critical tolerances to be provided with bid
|8||Previous Type test report/certificate on|
complete solid link assembly to be provided with bid
|10||Routine tests (acceptance tests on|
Product) to be provided on delivery
|11||Applicable standard||PIESA 002|
|12||Other applicable standards||NRS 035|
SABS IEC 60282-2
SABS IEC 60186
BS 137 part 2
A mechanical device for providing isolation of power equipment from the network, a disconnector is suitable for switching very small currents or where no significant
change in voltage occurs across the terminals. The option of earthing sections of power systems can be made available by providing each disconnector pole with one or two earthing switches.