Isolators (Disconnectors) 11 kV to 420 kV

Types

• Double Break Central Rotating
• Central Break
• Title Type - (1) Two Post (2) Three Post

Application

The disconnectors are in effect safety devices and severe for mechanical isolation of systems. In the open position they provide a visible isolation distance. They are able to open or close a circuit if either a negligible current is switched or if no significant change occurs in the voltage between the terminal of the poles. The disconnectors can be applied in many of the usual switchyard layouts of high voltage installation. They are designed for horizontal outdoor application. Under special conditions vertical installation is possible. For earthing and short circulation of switched out portion of the installation, the incorporation of one or two earthling switches are possible on each disconnector.

Features

1. The moving contact blade is an Aluminum /copper tube with special copper profile with a bimetallic strip fitted with silver plated copper contacts.
2. The stationary contacts are silver plated copper, spring loaded to maintain constant contact pressure
3. The electrical contact system is easily and quickly replaced should it be damaged due to a fault current or damaging event.
4. Range of Terminal connectors to suit current requirements.
5. Robust design and construction
6. Encapsulation of rotary pedestals and heads
7. No significant changes of contact resistance over many years of services
8. Constant contact pressure
9. Stable rotary pedestals ensure no insulator deflection even with high static loads.

Test And Quality

Successful type tests on the disconnectors have been carried out in our own and independent test laboratories in accordance with the latest ISS/IEC and DIN/VDE standards. Quality control of individual parts during manufactures ensure constant excellent product quality. Each equipment is subjected to all the routine tests also as per relevant standard at our before dispatch.

Operating Mechanisms

All disconnect can be supplied with manual operating mechanism or motor operating mechanism as requested by client. Each three pole disconnect or earthling switch group requires only one operating mechanism with the exception of 420 Kv 765 and 800 Kv disconnect or which is single pole operated. Disconnector and earthling switch can be mechanically inter locked with each other so that during manual operation it is only possible to operate the earthling switch with the disconnector in the open position and vice versa and whereas the motor operating mechanism of the disconnector is interlocked electrically.

The operating mechanism are fastened laterally to base frame the disconnect or install on high level it is possible to mount the operating mechanism within reach from the ground level by using of additional intermediate and operating shaft.