Standard for High Voltage eg connections


Minimum Short Circuit Ratio (MSCR)



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STNW1175-Standard-for-HV-EG-Connections

Minimum Short Circuit Ratio (MSCR) 
The 
MSCR
method as detailed in AEMO’s System Strength Impact Assessment Guidelines is 
based on the following Premises
:
(a) The Available Fault Level after connection
 
of the proposed EG System is compared against 
the minimum SCR/fault level for which it is capable of stable operation.
(b) The headroom (or margin) between the two values (Distribution System Strength
 
versus the 
EG System’s requirements) provides an initial indication of the connection point
 
capability to 
host the EG System and, therefore, the likelihood of an 
adverse system strength impact 
as 
defined in System Strength Impact Assessment Guidelines.
 


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
 
57 of 60 
Appendix F: Technical requirements summary– Class A1 and Class A2 (informative)
Inverter Energy Systems
 
Class A1 IES systems 
Class A2 IES systems 
Non-export 
Export 
Non-export 
Export 
Level 1 Backup protection
1, 2 
Yes
 
Yes 
Yes
 
Yes 
HV NVD protection
No 
No 
Yes 
Yes 
Grid Isolation Device Required 
No
No
Yes
Yes 
Distribution System Technical Study required 
Yes 
Yes 
Yes 
Yes 
Power quality to AS/NZS 61000 series 
requirements 
Yes 
Yes 
Yes 
Yes 
Communications / SCADA interface 
No 
No 
Yes 
Yes 
Fault level contribution to the Distribution 
System included in the Technical Study 
No
No
No

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