Fixed embedded generation systems between 1,500 kVA and 5 MVA to local low-voltage networks are made subject to the approval of the local network operator, known as the DNSP. Note that these connections involve a series of technical studies and compliance with particular standards over and above the normal requirements.
Key Technical Requirements
The following minimum technical requirements must be met to ensure safe and reliable integration of fixed EG systems:
Automatic Circuit Recloser (ACR)
An ACR is required for all systems to protect against electrical faults. The DNSP will install the device near the connection point to automatically restore service once a fault is cleared.
Power Limit Protection
This protective measure guarantees the avoidance of an overloaded system; besides that, generation capacity does not transcend the permissible level for a network.
Power Quality Monitor and EMT Study
For the concerned test, analysis of how the given condition will reflect upon the network of the power quality monitor, along with the electromagnetic transient (EMT) study, will be provided to the system.
Operating Protocol
There shall be development of an operating protocol in cases where specific guidelines of safety procedures should be issued on a specific operation process in relation to this type of system. It should also be noted that any connection apparatuses that are required would fall under the proponent’s expense, such as ACRs.
Connection Capability Considerations
Above 5 MVA, other regulations apply, and the proponent has to inform the DNSP of its intention to be registered as a generator. In a nutshell, someone wishing to connect fixed EG systems in that range of capacity has to go through some specific technical and financial requirements.
Subcategories of Fixed EG Systems
These subcategories categorize the fixed EG systems into classes depending on their capacity:
LV EG IES ≤ 30 kVA
Systems under 30 kVA.LV EG IES > 30 kVA and ≤ 200 kVA
Systems between 30 kVA and less than 200 kVA.LV EG IES > 200 kVA
Systems above 200 kVA and less than 1,500 kVA.LV EG Rotating Machines
Systems consisting of rotating machines, less than 1,500 kVA.LV EG Nonstandard
Systems with special connections that do not fit the standard requirements.
Non-Standard Arrangements
Some connections are classified as non-standard and should be assessed on a case-by-case basis. These include:
Brisbane CBD Connections
Connections that may potentially increase fault levels in the network.Multiple Connection Points
Where a premises has more than one LV connection point or is connected at a number of locations.More than 1,500 kVA but less than 5 MVA
Connections that are more than 1,500 kVA but less than 5 MVA must comply with specific additional requirements as outlined in Appendix E.Isolated Networks
STNW3512 standards govern connections to isolated networks.High Voltage (HV) Networks
Another standard governs the connection with HV networks (STNW1175).
There are different technical and regulatory requirements that come with connecting fixed embedded generation systems of 1.5 kVA to 5 MVA capacities in local LV networks, with the proponents. In other words, an understanding of the requirements, such as protection measures and technical studies, allows for the safe integration of energy on the local network by the embedded generation system.
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