IEEE 1584 · Engineering
Leading Relay Coordination Study for Industries in the Philippines
Assess the relay configurations and protection coordination utilizing Care Labs’ established solutions. Capitalize on our proficiency in enhancing your power systems. Carelabs models your facility's one-line diagram in ETAP and verifies every relay and breaker setting against manufacturer data before recommending a change.
Free ConsultationRecovering cleanly after the supply returns
Interruptions are a fact of operation on many Philippine sites. What separates a short stoppage from a long one is whether protection discriminates on restoration and whether the plant can restart in a controlled sequence.
What We Deliver
Grading verified across every path
Time-current curves are checked from final circuit to incomer with margins calculated against real device operating times, so a fault on one circuit is cleared locally instead of taking the incomer.
WHY IT MATTERS
The outage ends and the plant will not restart
Supply returns, everything energises at once, and protection operates on combined inrush. The site then restarts in pieces by trial and error, extending an interruption that the network had already ended.
- Settings read directly from each relay and trip unit, because the device and the settings schedule frequently disagree after years of adjustment.
- Transformer and motor inrush assessed together, since simultaneous energisation produces a condition no individual circuit calculation reveals.
- Grading verified on utility and generator supply separately, as the two present very different fault current behaviour.
- Undervoltage and under-frequency settings checked, so protection intended to shed load does not instead prevent a legitimate restart.
- Every recommended change reported with its arc flash consequence, because faster clearing reduces energy and longer grading margins raise it.
DELIVERABLES
What you receive
Issued against the Philippine Electrical Code and signed by the engineer who carried out the grading.
- 1As-found settings register covering every relay and adjustable trip unit
- 2Time-current curves per grading path with the achieved margin annotated
- 3Discrimination register naming each failing pair and the fault range where it fails
- 4An assessed restoration sequence where simultaneous restart is not achievable
- 5Recommended settings in the entry format your devices use, with a verification checklist
How the study runs
Audit the installed protection
Settings are read from every device and CT ratios, polarity and burden are verified against the schematics rather than assumed correct.
Establish fault levels
Grading depends on fault current at each position, so a verified short circuit basis is established from an existing study or within this scope.
Model devices and loads
Manufacturer characteristics are built for every installed device, and transformer and motor inrush behaviour is modelled for the restoration case.
Grade and test restoration
Margins are calculated across the fault range, and the simultaneous re-energisation case is simulated to establish whether the plant recovers.
Sequence where needed
Where restoration fails, a staggered restart sequence is developed and demonstrated on the model rather than discovered during the next outage.
Issue and verify
Settings and the restart sequence are issued with a verification checklist so applied values can be proven against the approved schedule.
Frequently asked questions
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