Explanations of Test Criteria & Results for Proposed microFIT Connections
If there is available capacity for your proposed MicroFIT connection at the station and feeder the calculator will output “Pass”. If you wish to continue with an application for a MicroFIT connection, please apply using the Micro-Generation Connection Application (FORM C). We remind applicants NOT to incur major project related expenses until they receive an Offer to Connect from our team.
If there is no available capacity for your proposed connection the calculator will output “Fail”. The following are the test results and explanations if there is no capacity for your connection.
Test 1 checks feeder loading and feeder generation capacity limitations on the distribution system. If there is no available feeder loading capacity, the calculator will output “fail” due to no available capacity on the Feeder(s) connected to our upstream Distribution or Transformer Station as per the
MicroFIT TIR. The total acceptable generation limit and acceptable capacity for connection to the feeder has already been reached. The total current shall not exceed either 200A (for those feeders operating below 13.8 kV) or 400A (for those feeders operating at or above 13.8 kV). This criterion was developed in response to our experience of unacceptable feeder voltage fluctuations and power quality issues when a large amount of generation has been connected at a distance from the supply station, as well as to respect equipment limitations.
Test 2 checks for available thermal capacity at the distribution or transformer station and upstream transmission station. If there is no available thermal capacity, the calculator will output “fail” due to thermal limitations already being reached at the station as per the MicroFIT TIR. Generation at the distribution station shall not exceed 60% of the maximum MVA rating of the single transformer and minimum station load. These limits are necessary to protect equipment that is currently installed in the station.
Test 3 checks for the loading versus generating balance on the distribution feeder. If there is no available generation capacity, the calculator will output “fail” due to the acceptable generation limits on the feeder already being reached (total generation must not exceed 7% of the annual line section peak load on F-class feeders or 10% for M Class feeders) as per the MicroFIT TIR. Specifically, connection would not comply with anti-islanding distribution system requirements. Important note: a proposed MicroFIT connection may fail Test 3 while a FIT project (greater than 10 KW) may pass at the same station and feeder. The Station and Feeder Capacity Calculator takes into account that FIT projects will have connection requirements which will be performed at the expense of the generator. A Connection Impact Assessment (CIA) is performed for FIT projects to identify connection requirements and associated costs.
Test 4 checks for available short circuit capacity at the distribution station and upstream transmission station. If there is no available short circuit capacity, the calculator will output “fail” due to the limits already being reached as per the
MicroFIT TIR. Short circuit limits at the Transmission Station high or low voltage bus must not be exceeded by the addition of generation facilities (a bus is a conductor in a station to which elements such as transformers or transmission circuits are connected). As a result, connection of the project would create a fault level which is beyond the mandatory Transmission System Code limit, as specified in Appendix 2 of the Transmission System Code.