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Solar power Anti Islanding The cost ??

Anne Otis

Hello all   G99  etc consumer advice  What are the standby running costs to monitor grid fail and and eventual inverter physical separation ?  Anyone know ? 

Q: How is physical separation achieved for islanding protection when grid is detected as down ?  There is much tech mumbo jumbo " phase detection " zero crossover " but no genuine answer as to what the standby costs of running all this this actually is 

Appears ( however fail is detected ) final physical separation is achieved by a plain old electro mechanical contactor ?  It is simply de-energised  Contacts separate and we are done ? 

Could it be that these power  devices are maintained energised all year 24/7 consuming power until here is an issue ? 

If so can the solar grid tie industry tell us what power is consumed in this effort and where does it come from ? 

ciao Ms Otis 

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    Physical disconnection is required.

    Contactors can be used, and often are for relatively simple installations or inside equipment. But other options exist, such as motorised circuit breakers, which can be U/V trip and hence very similar to a contactor, or shunt trip where backed up by a battery (often but not always using a protection relay also providing fault protection for the circuit).

    As Mike says overall power consumption is negligible compared with the power being controlled (but it might need considering, for example, in the design of the enclosure).

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  • 0

    Physical disconnection is required.

    Contactors can be used, and often are for relatively simple installations or inside equipment. But other options exist, such as motorised circuit breakers, which can be U/V trip and hence very similar to a contactor, or shunt trip where backed up by a battery (often but not always using a protection relay also providing fault protection for the circuit).

    As Mike says overall power consumption is negligible compared with the power being controlled (but it might need considering, for example, in the design of the enclosure).

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