EPMS — Electrical power monitoring system

EPMS watches medium- and low-voltage distribution, protection relays, breakers, generators and UPS. In FacilityOS it is strictly read-only for protection: it never opens or closes a breaker and never changes a protection setting.

IEC 61850

The gateway has its own MMS client. It enables the IED's report control blocks (buffered reports resume after a disconnection, the IED's buffer filling the gap) and polls the rest; it reads breaker position (Dbpos), quality and the device's own time stamp.
GOOSE subscription is available on Linux gateways (raw-socket permission needed). TLS is optional (port 3782).
Read-only end to end: the client has no control service at all.

Sequence of events (SOE)

Breaker, protection, ATS, generator, UPS and power-quality events ordered by each device's own time stamp (stored to the nanosecond, shown to the microsecond), answering the question "which breaker tripped first?".
Each event shows its time source and clock status (PTP, NTP, SNTP, IRIG-B or GPS; synchronized or not, clock failure, accuracy). Events time-stamped by the gateway for polled protocols are clearly marked.
Events are buffered through gateway outages, acknowledged only after the platform has stored them, append-only and kept for 400 days; CSV export is audited.

Fault records (COMTRADE)

Upload COMTRADE files (IEEE C37.111-1999 / 2013; ASCII, BINARY, BINARY32, FLOAT32; cfg + dat, .cff or zip; up to 32 MB per record), stored and re-checked by SHA-256.
The viewer offers zoom, cursors, channel selection, phasor diagram and single-cycle RMS, linked to the SOE events and alarms of the same device around the same time.
Records are imported by upload; automatic retrieval from IEDs is not available yet.

Power quality

THD, TDD, unbalance, flicker, frequency and voltage statistics, harmonic spectrum h2–h50, and sags, swells and interruptions on the ITIC curve, classified per IEEE 1159.
Compliance verdict against IEEE 519-2022 or EN 50160 / IEC 61000-4-30. Evaluation parameters (bus voltage, Isc/IL) are set by an engineer and audited; assumed values are stated in the report.
Mitigation effect: THDi, power factor and load before and after the harmonic filters, SVG / STATCOM or capacitor banks on the same bus.

Electrical assets and safety

Breaker operation counts and contact wear from the SOE (ANSI C37.06 or the manufacturer's curve); notice at 80 %, maintenance due at 100 %.
Protection settings management (read-only): upload the approved settings sheet (approved by a second manager) and the settings read from the relay (CSV or SEL text); every difference, missing and extra setting is listed. The platform never writes settings to a relay.
Arc-flash labels (NFPA 70E): import the IEEE 1584-2018 study results and print labels per 130.5(H); above 40 cal/cm² the label shows DANGER; studies older than 5 years are flagged for review.
Transformer loading and aging (IEEE C57.91 clause 7): top-oil rise, hot spot, aging acceleration factor, 30-day equivalent aging, loss of life and remaining life at the current rate.