tritech

Our Products

Application :

The isolators / disconnectors are mechanically operated safety device incorporated for electrical isolation of system. Open position provides safe and desired isolation. Hence, they are widely used in high voltage installations, transmission and distribution layouts for isolation of part or complete electrical system for carrying out maintenance, repairs and similar activities where the system has to be isolated from primary circuit.

Types

Particulars For Mains For Earth
Rated Voltage 11 kV, 22 kV, 33 kV, 66 kV, 110 kV, 132 kV, 220 kV 11 kV, 22 kV, 33 kV, 66 kV, 110 kV, 132 kV, 220 kV
Highest System Voltage 12 kV, 24 kV, 36 kV, 72.5 kV, 123 kV, 145 kV, 245 kV 12 kV, 24 kV, 36 kV, 72.5 kV, 123 kV, 145 kV, 245 kV
Current Rating 400A, 630A, 800A, 1250A, 1600A, 2000A, 2500A 400A, 630A, 800A, 1250A, 1600A, 2000A, 2500A
Type 1) Banging Type
2) Turn & Twist Type
3) Horizontal Double Break (HDB)
4) Vertical Single Break (VSB)
5) Horizontal Single Break (HSB)
6) HDB with UNDERHUNG
Banging Type
STC Value For :
1) 11 kV - 13.1 kA for 3 seconds
2) 33 kV - 31.5 kA for 3 seconds
3) 66 kV - 40 kA for 3 seconds
4) 132 kV - 40 kA for 3 seconds
5) 220 kV - 40 kA for 3 seconds
For :
1) 11 kV - 13.1 kA for 3 seconds
2) 33 kV - 26.5 kA for 3 seconds
3) 66 kV - 40 kA for 3 seconds
4) 132 kV - 40 kA for 3 seconds
5) 220 kV - 40 kA for 3 seconds
Operating Mechanism Motorized Operating, Manual Reduction Gear Operating , Manual Operating (as per customer requirements)
Support Structure Pipe type structure & Lattice / channel type structure (as per customer requirements)
Insulator Creepage Normal Creepage (25 mm /kV) OR Higher Creepage (31 mm/kV) (as per customer requirements)

Testing Approval

Following tests carried out at Electrical Research & Development Association, Vadodara and cleared in accordance with IS-9921 (part I to V) / IEC-60129 / IEC -62271 (102)

  • Short Time Current test for mains & earth switch.
  • Temperature Rise test.
  • Lightening Impulse Voltage Withstand test.
  • Dry Power Frequency Voltage Withstand test.
  • Wet Power Frequency Voltage Withstand test.
  • Mechanical Endurance test.
  • RIV Corona test.

Features

  • Design with technical excellence and free from maintenance.
  • Sturdy Construction.
  • Well achieved consistency in contact pressure and contact resistance over a long period.
  • Adjustable horn bars provided to ensure engagement and disengagement of moving blade with fix contact.
  • Withstand high static loads without deflection.
  • Provision of individual stopper for alignment of moving blade with fixed contact on each phase.
  • Environmental protection for mechanism is assured by "closed canopy" designed completely encapsulating the turn & twist mechanism eliminating entry of pollutants viz. rain water, snow, dust or any kind of foreign material which would otherwise result in improper functioning of isolator.
  • Operationally both banging as well as turn & twist design are very smooth.
  • The copper pipe provided for turn & twist movement is having two brass bushes which act as self-lubricant to ensure smooth movement.

Operating Mechanism

Both Isolators mains and earth switch are equipped with single operating mechanism to operate individually. Isolators are equipped with manual or motorized operating mechanism mounted underneath base and operating handle, operating box at accessible height. A common operating mechanism is designed which incorporates tandom pipe for all three phases for mains and similar for earth switch. Individual phases can be aligned to achieve required contact by sliding required assemblies of phases on tandom pipe.

Manual operating mechanism :

  • Manual operating mechanism is provided with operating handle.
  • As a safety measure, the operating handle comes with insulation. We use heat shrinkable sleeves for Isolators and PVC sleeves for AB Switches, as insulating material.
  • Operating boxes conforming to IP-55 / IP-67 grade are provided and fabricated out of MS / AL / SS sheet (powder coated / painted).
  • Interlocking arrangement.
  • Safety locks for both mains and earth in open and close position alternately.

Motorized operating mechanism :

  • Motor and reduction worm gear are coupled to increase the output torque.
  • Over load protection provided.
  • Remote control can be provided - optional.
  • Certified auxiliary switches are incorporated.
  • Operating boxes conforming to IP-55 / IP-67 grade are provided and fabricated out of MS / AL / SS sheet (powder coated / painted).
  • Interlocking arrangement.
  • Safety locks for both mains and earth in open and close position alternately.

Installation

Major assemblies and sub assemblies of isolators and earth switches are carried out in house. All three individual phases aligned and assembled on respective base. Separate guide for installation provided will ensure easy, safe, trouble free and fast installation without use of specialized tools.

Main installation to be done on site

  • Erection of structure.
  • Mounting of individual phase on structure.
  • Mounting earth switch and operating mechanism on structure.
  • Connection for supply through braided copper flexible and terminal connectors.

Maintenance

  • Design of isolators is totally maintenance free. But considering safety of operation in future we recommend periodic inspection.
  • Inspection can be done visually or by equipments depending upon criticality, available modes of equipments and future requirements, operational / non operational period.
  • Lubrication can be done in idle period through grease / oil cups provided for parts in rotary motion.