Standard for High Voltage eg connections


Standard for High Voltage EG Connections



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STNW1175-Standard-for-HV-EG-Connections

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
 
42 of 60 
For EG Systems with inverters, the sustained fault current contribution shall not exceed the rated 
current of the inverter(s). If this occurs, then the use of short circuit current limiters shall be used in 
agreement with the DNSP. 
6.5 DNSP Technical Study – Class B 
Class B Technical Studies are carried out for those EG Systems identified as Class B in Table 1. 
For systems connecting under Chapter 5 of the NER, this will occur during the Detailed Enquiry 
phase, and shall cover the requirements under S5.4B of the NER.
The following items shall be addressed for all EG Systems connecting within the Distribution 
System:
a. Distribution system capacity assessment and identification of power transfer capability;
b. Identification of other generating systems which may impact the connection; 
c. Power quality allocation for fluctuation and distortion;
d. Power quality assessment of voltage rise, informing the required control mode and proposal 
of acceptable setpoints and droop settings;
e. Fault current contribution, if applicable;
f. Protection requirements;
g. Details of Performance Standards;
h. Generation and/or load rejection studies;
i. Plant energisation studies; 
j. Requirements for curtailment;
k. Identification of operational considerations; 
l. Identification of required power quality monitoring and SCADA connection; and 
m. Preliminary assessment of system strength impact, calculating the Minimum Short Circuit 
Ratio (MSCR) as defined by the AEMO System Strength Assessment Guideline.
The Performance Standards identified define the access standards applicable to the connection.
Access standards are divided into “automatic access standards” (the default position), “negotiated 
access standards” (a negotiated position) and “minimum access standards” (the minimum 
requirement for a 
negotiated access standard
). Further information on this is set out in Table 27. 

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