AS NZS 4777.1:2016 pdf free download

AS NZS 4777.1:2016 pdf free download
AS NZS 4777.1:2016 pdf free download.Grid connection of energy systems viainverters
4.4 OVERCURRENT PROTECTION
Where the energy source is a PV array, AS/NZS 5033 shall be used to determine if overcurrent protection is required and at which locations.
All other energy source cabling shall be protected against overcurrent in accordance with AS/NZS 3000.
NOTE: Overcurrent protection of the cable needs to take into account fault currents that may be sourced from the inverter and the energy source output.
Devices for protection against overcurrent shall not be provided for circuits where unexpected opening of the circuit could cause a danger greater than overcurrent.
NOTE: Some generation sources, such as some wind turbines, require the output to be short circuited to provide braking for safety reasons. In this situation, the overcurrent device may be omitted.
Where the energy system incorporates a battery storage system, overcurrent protection shall be provided to protect, as far as practicable, all wiring from prospective short circuit current or overload current from the battery storage system.
NOTE: Overcurrent protection may be by high rupturing capacity (HRC) fuses or circuit breakers suitable for operation on d.c., sized to limit the current below the maximum current-carrying capacity of any part of the connected circuit. The wiring from the battery terminals to the overload protection device should be as short as possible, with special attention paid to its mechanical protection.
4.5 ISOLATION DEVICES
A labelled isolation device, able to be secured in the open position, shall be provided between any energy source and the inverter. This device shall comply with the requirements of devices for isolation and switching in AS/NZS 3000 and be capable of safely breaking voltage and current under both normal and fault conditions.
The isolation device shall be located adjacent to the inverter energy source port and be readily available unless the energy storage and the inverter are physically integral, in which case the requirements of AS 62040.1.1 shall be adhered to. Where there are multiple inverter energy source ports, each port shall have an isolator for each connected energy source.