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Carelabs

IEEE 1584 · Engineering

Reliable Power System With Effective Relay Coordination

Minimize downtime with optimized relay settings and coordination. Care Labs offers systematic ETAP protection coordination studies for industries in Thailand. The result is a set of time-current coordination curves confirming each relay and breaker trips only for the fault closest to it.

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Grading that ends at your intake, not at the meter

Your protection has to discriminate with the device upstream of it, and that device belongs to the estate or the utility. Grading that stops at the intake leaves the most consequential margin unverified.

What We Deliver

The upstream margin checked

Coordination is verified between your incomer and the supplying device, which is what determines whether a fault inside your installation trips only your equipment or takes the supply to neighbouring tenants with it.

WHY IT MATTERS

A fault in your plant should stay in your plant

Where the incomer does not grade with the supplying device, an internal fault can trip the upstream protection. The consequence extends past your boundary, and the conversation that follows is with the estate rather than with maintenance.

  • Upstream device characteristic obtained from the estate operator or utility, since your ceiling is set by equipment you do not control.
  • Settings read from your own devices rather than the schedule, because the two frequently disagree after years of commissioning adjustment.
  • Grading verified against calculated fault levels at each position rather than against generic curves supplied with the relay.
  • CT ratio, class and burden checked, as a saturating CT delivers distorted current and the relay then operates correctly on wrong information.
  • Every recommended change reported with its arc flash consequence, so selectivity is not bought at an unexamined safety cost.
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DELIVERABLES

What you receive

Issued against the EIT standard and signed by the engineer who carried out the grading.

  1. 1As-found settings register covering every relay and adjustable trip unit
  2. 2Time-current curves including the upstream supplying device, with the achieved margin annotated
  3. 3Discrimination register naming each failing pair and the fault range where it fails
  4. 4Recommended settings that fit beneath the supplier's fixed characteristic
  5. 5A verification checklist so applied values can be proven against the approved schedule
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How the study runs

01

Establish the ceiling

The upstream device's characteristic is obtained from the estate operator or utility, since it constrains everything that can be recommended below it.

02

Audit your protection

Settings are read from every device on site and CT ratios, polarity and burden verified against the schematics rather than assumed.

03

Confirm 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.

04

Grade from the top down

Margins are calculated from the supplying device downward, which is the order that makes the constraint visible before effort is spent below it.

05

Resolve the conflicts

Where selectivity and clearing time conflict, options are presented with the incident energy consequence of each for your team to decide.

06

Issue and verify

Settings are issued with a verification checklist so applied values can afterwards be proven against the approved schedule.

Frequently asked questions

Usually yes, and it is worth asking early. Operators are generally willing to provide the characteristic of the device feeding your intake, since a tenant whose protection grades properly is one less cause of an estate-wide interruption. Where it is not available, a conservative assumption is used and flagged as such.
That is a genuine finding rather than a failure of the study. It usually means the upstream device is set faster than your incomer can discriminate beneath, and the options are a different incomer characteristic, current limiting, or a conversation with the operator. Knowing it beforehand is better than discovering it during a fault.
Reading settings and verifying CTs is generally done with the plant running, and the analysis is offline. An outage is required only where settings must be applied to devices that cannot be changed live, or where injection testing is in scope, and that requirement is scoped before mobilising.
Ideally yes, since they share inputs and pull against each other. Clearing time governs incident energy while grading margins tend to lengthen it. Running both against one model means the trade-off is resolved deliberately rather than one study quietly undoing what the other recommended.

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