How Does Earthing or a Disconnector Switch Play Rule to Personnel Safety Even in an Isolated, Disconnected Line?
The function of an earth or disconnector switch is to discharge the capacitive voltage stored in the generator side or long transmission line conductors in the isolated system just after opening the CB (Circuit Breaker) and Isolator.
So, we understand that the main purpose of the earth switch is to ground the isolated bus/conductor. Generally, the earth switch is mechanically interlinked with the isolator. Means when the isolator opens the circuit then earth-switch closes & vice-vars.
When the earth switch is connected to the isolated but charged system, it discharges the stored energy to earth, so that maintenance work can be carried out either in line on the generator side.
So, the earth switch provides extra safety to the working personnel during transmission line maintenance.
You may refer to:Case-1:
When the line crews were working on a dead line where parallel another line is alive. The line crews experienced the existing voltage, and they felt an electrical shock.
Case-2:
When we construct parallel two circuits high voltage transmission line and energized a single circuit first. We found that the other circuit was also experiencing around 1kV in the control panel metering system. This happened due to induced voltage.
Case-3:
When we constructed a long overhead transmission and it caused electric shock before touching any energized line. Finally, we discovered the voltage developed in it due to conductor capacitive behavior.
When Should an Earthing Switch or Disconnector Be Operated?
Operating the earth switch on an energized line may causes sever accident. The condition for earth switch operation is as below;- Earth switches should be operated only when the isolators are open;
- All earth switches can be operated manually. Semaphore indicator can be seen for position feedback (on/off) in the switchyard control panel.
Latest Earth Switch or Disconnector
What we discussed is for maintenance purposes (earth switch mainly, but in the latest GIS (Gas Insulated Switch) system switch-gear used automatic high-speed earth switch. In this system, when any fault occurs, the faulty part is automatically isolated and earthed by a high-speed auto earth switch, protecting the equipment immediately.
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