Power Supply

A) Capacitive power supply
Two potential plates are mounted near a power transmission line. The supplied capacitive power will be transmitted to a capacitor. This capacitor-charge guarantees the function of the short circuit indicator. The above mentioned system can only be applied with unscreended cables.

B) Auxiliary voltage 9-110 VDC, 230 VAC
The power supply of the short circuit indicator is carried out by a network which is independent of the controlled network (e.g. emergency power net 230 VAC -- parallel networks -- or similar systems).

C) Power supply 230 VAC with capacitor buffering
The short circuit indicator is supplied with power from the controlled network.
In case the operating voltage breaks down due to a short circuit, a capacitor stores power which guarantess all switching and indicating functions once. After the net has been reclosed, the short circuit indicator resets itself, and the capacitor is being recharged.

D) Power supply 230 VAC with battery buffering
The power, which is necessary for using the short circuit indicator, can be supplied by the controlled network. This power breaks down in case of a short circuit. However, the operating voltage is already provided by an accumulator, which is continuously charged. This version of the indicator also provides a self-acting reset after a preadjusted time if the system is not working.

E) Battery (lithium type)
A battery (lithium type) supplies the short circuit indicator with the necessary operating voltage. Each battery is exchangeable. The life time of the battery is between 5 and 10 years (depending on the version of the indicator).

F) Inductive power supply
The power for operating the short circuit indicator is gained via an inductive coupling to a power transmitting line. Via a coil, the operating current (minimum 10 A) generates as much power as the operation of the short circuit indicator requires. This system is only possible together with screened single-core-cables.

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