Standard for High Voltage eg connections


Fault levels and protection impacts



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STNW1175-Standard-for-HV-EG-Connections

4.9 Fault levels and protection impacts 
Fault levels shall not exceed the equipment rating of the EG System, Distribution Network 
equipment, associated switchgear and protection equipment. Where the EG System is able to 
contribute to fault levels, the DNSP shall: 


Standard for High Voltage EG Connections 
 
STNW1175 
Owner: EGM Engineering
Release: 4, 11 Feb 2022 

Document ID: 2946177 
SME: Manager Generation & Customer Standards 
Uncontrolled When Printed
 
24 of 60 
a. Conduct fault studies which includes the fault contribution from the Proponent’s EG 
System; and 
b. Provide the Proponent with the existing fault levels and protection equipment ratings to 
assess whether the design of the EG System exceeds relevant equipment ratings. 
Where it is determined the design of the EG System has the potential to raise the fault levels on 
the Distribution Network beyond the capacity of the DNSP’s protection device(s), the Proponent 
shall meet the cost to upgrade the protection device(s) and ensure that their switchboard and 
equipment can withstand the total prospective fault currents. 
Fault level considerations shall be made for the following configurations of EG Systems with 
Rotating Machine EG Unit(s): 
i. Stand-by EG Systems shall have a pro-rated factor applied to the prospective fault levels, 
which shall be dependent on the number of EG System connected to the relevant part of 
the Distribution System at the same time; and 
ii. Continuous Parallel EG Systems shall have fault levels considered for both HV and LV 
Distribution Systems. 
4.9.1 Fault withstand requirements 
It is suggested that plant within the generating facility is specified with the following fault withstand 
requirements in Table 11.  

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