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IEEE Std C37.91 is intended to provide protection engineers and other readers with guidelines for protecting three-phase power transformers of more than 5 MVA rated capacity and operating at voltages exceeding  10 kV. It Includes general philosophy, practical applications, and economic considerations involved in power transformer protection. 

PRC-027-1 Coordination of Protection Systems for Performance During Faults is to maintain the coordination of Protection Systems installed to detect and isolate Faults on Bulk Electric System (BES) Elements, such that those Protection Systems operate in the intended sequence during Faults. 

TPL-001-5 is to establish transmission system planning performance requirements within the planning horizon to develop a Bulk Electric System (BES) that will operate reliably over a broad spectrum of System conditions and following a wide range of probable contingencies.

Microgrid protection and control involves the efficient management and safeguarding of localized energy systems. Through advanced techniques, they control bidirectional power flow, provide defense against system faults, and enable seamless transitions between grid-connected and independent operations. As a cutting-edge development in energy distribution, they are central to ensuring the resilience and sustainability of modern power systems.

The PRC-028-1 standard mandates timely and accurate disturbance monitoring for Inverter-Based Resources (IBRs) during system disturbances. It sets specific criteria for data retrievability, time synchronization, and recording formats. Entities must restore recording capabilities within 90 days of a failure, with provisions for a Corrective Action Plan if this isn't achievable, ensuring a balance between practicality and consistent data quality for effective disturbance analysis.