Fuse Link, - 25 AMP - K

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                        Fuse Link, - 25 AMP - K
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Fuse Link, – 25 AMP – K

Oei Power

IEC IEEE

Manual

Ist

Turn the Horizontal

Three

Single Ground

Three Pole

Horizontal Rotary Type

Grounding

Manual

Outdoor High-voltage

Three-column Disconnector

High-voltage

Kv

Kv

OEI Power

Cartons Pallets Wooden Case

IEC62271-102

China Nanyang

8535309000

Product Details

The fuses mention in the table below will be exposed to the following environmental conditions:
   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.
 

  1. 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.

  1. 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.

  1. Standards
    1. Type IST off-load isolator switch are complied with relevant requirements of the following standards together with all current amendments;
  1.  IEC62271-102:2003 :High-voltage alternating-current disconnectors and earthing switches
  2.      IEC60129:1984   :Alternating current disconnectors and earth switches
  3.      IEC 60265-1:1998  :High voltage switches – Part 1:Switches for rated

                     voltage above 1kV and less than 52kV

  1.      IEC 60694: 1996  :Common specifications for high-voltage switchgear and

                     controlgear standards

  1.      IEC 60815:1986   :Guide for the selection of insulators in respect of

                      polluted conditions

  1.      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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