Fuse Link, - 25 AMP - K
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Product Details
Maximum altitude above mean sea level less than 1,000 m;
Maximum ambient air temperature 400C;
Maximum daily average ambient air temperature 300C;
Minimum ambient temperature150C; and
Maximum relative humidity 100%.
Requirements
The fuse-links and fuse-end fittings shall be of the following ratings (table below) and comply with the IEEE Std C37.4 -2016 or an equivalent international standard. The fuse- links shall be used primarily for protection of distribution transformers, laterals and sub- laterals.
The fuse links shall be capable of withstanding 125% ofthe transformer rated full load current continuously and periodic over-loads up to 150% ofthe transformer rated full load current.
The current-time characteristics of the fuse-links offered shall be submitted with the tender
Markings shall be provided on the fuse-links in accordance with ANSI/IEEE Standards.
- Scope
Type IST off-load switchs are suitable for use in tropical zone, with a maximum ambient temperature of approximately 40 degrees Centigrade and an average temperature of approximately 28 degrees Centigrade with high humidity and heavy rainfall. The preferred operational altitude is up to 1800 m above sea level.
- Electrical System
Type IST off-load isolator switch are designed for continuous operation on a 3-phase 3-wire 11, 15,22,24,27and 33,36kV,50/60Hz distribution system with the star-point of the source-point transformer earthed through an Arc Suppression Coil or Earthing Resistor.
- Standards
- Type IST off-load isolator switch are complied with relevant requirements of the following standards together with all current amendments;
- IEC62271-102:2003 :High-voltage alternating-current disconnectors and earthing switches
- IEC60129:1984 :Alternating current disconnectors and earth switches
- IEC 60265-1:1998 :High voltage switches – Part 1:Switches for rated
voltage above 1kV and less than 52kV
- IEC 60694: 1996 :Common specifications for high-voltage switchgear and
controlgear standards
- IEC 60815:1986 :Guide for the selection of insulators in respect of
polluted conditions
- BS EN ISO 1461 :Hot dip galvanized coatings on fabricated iron and
steel articles- Specifications and test methods
4.0 Construction
4.1 General
4.1.1 Type IST off-load isolator switchs are the vertical/Horizontal mounting
Type for mounting on a single or H-pole structure for overhead
lines or feeders from the energized sections.
4.1.2 Type IST off-load isolator switchs are compatible and ready for
installation on tubular steel poles and spun concrete poles.
4.1.3 The design are of an air insulated "rocking insulator"
type with two fixed insulator posts and one moving
insulator post per phase.
4.1.4 All steel and iron parts shall be galvanized to protect from corrosion as
per BS EN ISO 1461
4.1.5 Type IST off-load isolator switchs are equipped with a single operating mechanism and suitable coupling bars that shall operate all phases simultaneously and that independent operations of each
pole,irrespective of the state of the other poles,is not permitted
SPECIFICATIONS
i. Rated Voltage | 12kV | 24KV | 36KV | ||
ii. Rated Continuous Current Carrying Capacity |
Not Less Than 400A Up to 630A | ||||
iii. Rated Short-Time Withstand Current (rms) | 12KV | 24KV | 36KV | ||
>=20KA / 3 sec |
>=25KA/ 3 sec |
||||
iv. Lightning Impulse Withstand Voltage (peak) -To earth and between poles min max |
12KV | 24KV | 36KV | ||
60KV 75KV |
95KV 125KV |
145KV 170KV |
|||
-Across the isolating distance min max |
70KV 85KV |
110KV 145KV |
165KV 195KV |
||
v. Power Frequency Withstand Voltage(r.m.s) -To earth and between poles |
12KV | 24KV | 36KV | ||
28KV |
50KV |
70KV |
|||
-Across the isolating distance | 32KV | 60KV | 80KV | ||
vi. Average Ambient Temperature (Maximum) |
28ºC (40ºC) |
i. Humidity Range | 0-100% | ||
ii. Preferred Altitude Requirement | Up to 1,800m | ||
iii. Insulators Total Creepage Distance (mm) Min Max |
12KV | 24KV | 36KV |
192 | 384 | 576 | |
465 |
600 | 900 |
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