Standard for High Voltage eg connections



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STNW1175-Standard-for-HV-EG-Connections

Connection arrangement 
Fail-safe interlocking
1
 requirements 
Multiple transformers or multiple 
Connection Points 
No customer transformers are connected in Parallel.
Bumpless transfer 
During the transfer from one source to another, the interlock operation 
cannot enable the EG Unit and the Distribution System to both supply 
the load at the same time longer than the maximum allowable duration 
for bumpless transfer in Table 3 of Section 4.3 of this Standard. No 
distribution transformers will be connected in Parallel any point during 
the bumpless transfer.
 
Off grid 
During the transfer from one source to another the interlock operation 
cannot allow the Generating Unit and the Distribution System to both 
supply the load at the same time.
 
Note 1: The interlocking mechanism should be a mechanical fail-safe system. Electronically controlled 
interlocking systems may be allowed upon approval of a functional design and operational specification 
certified by an RPEQ in the application stage. 
4.16 Curtailment schemes 
Where required for thermal protection or stability, a curtailment scheme may be required. This will 
be identified as part of the connection process. The DNSP shall provide a standard data exchange 
document outlining preferred hardware and configuration during the Technical Study. 
Depending on the Connection Point to HV network (Sub-transmission or Distribution) there may be 
a need for generation reduction or curtailment signals between AEMO, TNSP, DNSP and EG 
control systems

If the Proponent operates outside the transmitted constraints, then the DNSP may 
disconnect the EG System from the Distribution System. Constraints include but are not limited to 
feeder and transformer thermal capacity, fault contribution, credible contingency events and 
network stability. 

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