Insulators
Capacitive Voltage Indication for medium Voltage OVI+
The voltage indication system consists essentially of a capacitive voltage divider between the conductor L and earth, an indicator and a surge diverter.
Function: The voltage divider ratio should be selected so that:
- Up to 10% of the rated voltage of the medium-voltage equipment there is no indication.
- From 40% of the rated voltage of the medium-voltage equipment there is always an indication. The indicator, system HO contains a glow lamp which flashes when a voltage is being applied. The voltage is indicated separately for each conductor and independent from the other conductors. The system operates without a battery or auxiliary supply, drawing its energy from the high-voltage system. One indicator per conductor can be plugged into sockets directly on the front panel of the switchgear, which are connected via permanent conductors to the voltage divider post insulator.
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Shock-hazard protection
Persons are not at risk with the voltage indicating system, neither during normal nor during disturbed operation.
During normal operation, the voltage divider capacitance C1 limits the possible currents to less than 100 μA. They remain cleary below these limit values, irrespective of whether the indicator is plugged in or not or whether the connection socket is earthed or not.
In the event of the insulation being punctured, a surge diverter is provided at the connection of the divider capacitance C1 to prevent the high voltage from being transmitted to the low-voltage side. This operates within 0,05 ms and limits the voltage at the socket to approximately 20 V.
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