NERC PRC-002-5: Disturbance Monitoring and Reporting Requirements

Installation, maintenance, and reporting obligations for disturbance monitoring equipment at BES facilities

What Is PRC-002-5?

When a significant grid disturbance occurs, reliability engineers need recorded data to understand what happened, when it happened, and why. Without that data, post-event analysis is guesswork. PRC-002-5 exists to make sure that data is there when it's needed, requiring BES facilities to install, maintain, and operate disturbance monitoring equipment (DME) capable of capturing system events.

The standard was developed in response to recurring situations where post-event investigations were hampered by gaps in recorded data. It establishes minimum equipment requirements, data retention periods, and reporting obligations that apply consistently across BES generators and other applicable facilities.

Compliance is subject to audit by NERC and the applicable regional entity. Evidence requirements include equipment documentation, calibration records, and records of disturbance data submissions.

Who Must Comply?

PRC-002-5 applies to Generator Owners (GO), Transmission Owners (TO), and Distribution Providers (DP) whose facilities meet the applicability criteria in the standard. Each Transmission Owner and Reliability Coordinator must evaluate BES elements according to the standard at least once every five years and notify Generator Owners if they are required to comply.

The required DME type varies by facility. Attachment 1 of the standard defines which combinations of equipment are required based on facility characteristics. The three main categories are:

Fault recorders (FR): Capture high-speed waveform data during fault events
Dynamic disturbance recorders (DDR): Continuously record data including frequency, voltage, and power over longer windows
Sequence of events recorders (SER): Log discrete events such as breaker operations and relay targets with millisecond timestamps

Facilities below the standard threshold may still be required to comply if designated by their regional entity or reliability coordinator.

Key Requirements

Equipment Installation and Maintenance

Install and maintain the type of DME specified in Attachment 1 for the facility. Equipment must meet the performance requirements defined in the standard, including time synchronization accuracy, sampling and recording rate, and file type.

Triggering Configuration

DME must be configured with triggering thresholds for the quantities defined in the standard. Trigger settings should be documented and must be maintained. Equipment in standby or with improperly set triggers does not satisfy the requirement.

Data Retention

Recorded disturbance data must be retrievable for 10 days, and provided within 30 days of a request.

Commissioning Documentation

Owners should request commissioning records with proof that SER, FR, and DDR record in the appropriate format, with the correct sampling rate, recording length, and triggers.

Common Compliance Challenges

Legacy Equipment That No Longer Meets Requirements

Many facilities installed DME years ago that met the requirements at the time but no longer satisfies current PRC-002-5 criteria, particularly time synchronization requirements and data sampling rates. Owners may not know they have a gap until an audit finds it.

Reporting Process Gaps

The obligation to report disturbance data after a triggering event is time-sensitive, but many facilities don't have a clearly documented internal process for identifying trigger events and initiating a report. This results in missed or late submissions that show up as violations.

Calibration and Maintenance Records

Auditors expect to see calibration records and maintenance logs for DME. Facilities that have the right equipment but can't produce documentation showing it's been properly maintained are still at risk of a finding in an audit.

How TWC Can Help

TWC performs PRC-002-5 compliance assessments for generator owners across North America, from initial applicability review through evidence package development.

Applicability and Gap Assessment

We review your facility against the requirements then compare that against what's actually installed to identify gaps that need to be addressed before an audit.

Equipment Specification Support

When equipment upgrades are needed, we help specify the right product, define the required metering quantities and trigger settings, and confirm the installation meets the standard before you submit evidence.

System Design and Commissioning

We design and support the commissioning of an independent recording system, or incorporate it into your existing microprocessor-based electrical equipment.

Audit-Ready Evidence Packages

We prepare compliance documentation organized by requirement, including equipment records, trigger configuration logs, calibration history, and a record of completed submissions.

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