Type: High-voltage
Installation: Outdoor High-voltage
Grounding Mode: Grounding
Number of Poles: Three Pole
Series: Three
Common Model: Ist
Certification: IEC IEEE
Trademark: OEIpower
Specification: IEC IEEE
HS Code: 8535309000

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 +30ÂºC with a minimum of -1ÂºC and a maximum of +40ÂºC 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 ofÂ 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
Â

S.No	DESCRIPTION	UNITS	BIDDER OFFERED VALUE
1.	Rated Voltage	KV	12 KV
2.	Frequency	Hz	50 Hz
3	Rated continuous current	A	630
4	Impulse withstand voltage to ground	KV	95
5	Impulse withstand voltage across gaps	KV	110
6	Dry one-minute power frequency withstand voltage to ground	KV	35 Â
7	Dry one minute power frequency withstand voltage across gap	KV	45
8	Wet one minute power frequency withstand voltage to groundÂ Â Â Â Â Â	KV	30
9	Limits of radio interference 10KVÂ and 1000 K.C/Sec	Â	250Â uV
10	Temperature rise at rated current (max.) Â Â Â Â Â Â	Â	30oC at 50oC ambient
11	Dimensions and mechanical ,Electrical values Of Polymer Insulator	Â	Â
12	Leaking distanceÂ	mm	Â Â Â Â Â Â 508 (minimum)
13	Dry arcing distanceÂ Â Â Â	mm	210 (minimum)
14	Cantilever strengthÂ Â Â Â Â	kg	400Â Â
15	Tensile strength	kg	1000
16	Compressive strengthÂ	kg	5400
17	Tensile proof test loadÂ Â Â Â Â Â	kg	700
18	Dry power frequency flashoverÂ Â Â Â Â Â	KV	85Â
19	Wet power frequency flashoverÂ Â Â Â Â Â	KV	55Â
20	Dry one-minute power frequency withstand	KV	70
21	Wet one-minute power frequency withstand	KV	45
22	Impulse flash over positiveÂ Â Â Â Â Â	KV	115Â
23	Impulse flashover negativeÂ Â Â Â Â Â	KV	140
24	Power frequency puncture voltageÂ	KV	150 Â

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