However, based on Footnote 13c, a non-redundant station DC supply can be excluded if it is monitored 24/7 for low voltages and open circuits, and reported to a control center. The provisioning cost of this addition could exceed $50 000, making it difficult to obtain funding. As it stands, non-redundant components of a protection system such as a station DC supply with only one charger and one battery string, is considered a single point of failure.Īdding a redundant DC supply system to eliminate this single point of failure for some substation owners may be difficult and, to some extent, impossible to do for various design constraints. The FERC Order 867 is approving the updated standard addressing a protection system’s single point of failure. I could possibly add a fuse to detect short circuits, but what about open circuits.On April 1st, 2023, the NERC standard TPL-001-5 will take partial effect in the United States. How do I check short/open circuits in sensors. I don't quite understand how I can implement this rule in my current design. I also use a commercial DHAS Current sensor that gives goes to an OP-AMP comparator in my circuit. It is NO type sensor which gives a Open Circuit when brake is not pressed, and closed when brake is pressed. I have a BSPD circuit that runs on a pressure sensitive brake sensor inputs that tell brake is pressed or not pressed. The circuit must also include open/short circuit detection for sensor inputs such that the shutdown circuit is opened. The action of opening the AIRs must occur if the implausibility is persistent for more than 0.5 sec.Ĭ. The current limit for triggering the circuit must be set at a level where 5 kW of electrical power in the DC circuit is delivered to the motors at the nominal battery voltage.ī. The EV 7.6.1 Rule according to the 2019 Rule book is:ĮV.7.6 Brake System Plausibility Device (BSPD) EV.7.6.1 A standalone nonprogrammable circuit must be used on the vehicle such that when braking hard (without locking the wheels) and when a positive current is delivered from the motor controller (a current to propel the vehicle forward), the AIRs will be opened.Ī.
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