In Ontario, the protection and control as well as the communication block diagram of any new high voltage substation shall be sent to IESO (Independent Electricity System Operator) for approval. The same applies to the plans for the protection systems upgrades at existing stations.
In case the existing remote trip relays are out of date (say Statrel RT8B ), they shall be replaced with ABB NSD 570 relays and Bell S4T4 (Schedule 4 Type 4) phone circuits. Dual A and B protections for each line shall be provided to communicate with the relays at upstream Hydro One station.
The existing line impedance relay - if out of date - shall be replaced with SEL-421 relays. Reverse power protection may also be required to prevent embedded generation of feeding the grid or back feed of one line by the other in the case of distributed generation stations.
The expected in-service date for the new equipment shall be communicated to the IESO as well.
The IESO shall review the design and onfirm that the proposed upgrades will not result in a material adverse impact on the reliability of the integrated power system.
In any case, the requirements of Transmission System Code issued by Ontario Energy Board shall be satisfied.
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