Testing & Commissioning
Protection Relay Testing
Protection relay testing proves the settings actually do what they are supposed to, rather than assuming a configured relay is a working one. We configure and test relay protection on recloser systems.
The protection relay is what makes a recloser a protective device rather than a switch. Its settings determine which faults it responds to, how fast, and how many times it attempts to reclose before locking out.
We configure and test relay protection on the RC5_4 control, and on other platforms where the installation calls for it.
What relay configuration and testing covers
- Overcurrent pickup and time settings
- Curve selection matched to the feeder and coordination requirements
- Earth fault and sensitive earth fault configuration
- Reclose sequence and lockout configuration
- Cold load pickup and inrush restraint where required
- Verification of every configured element by injection
- Settings record issued with the commissioning documentation
What matters in practice
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Settings come from the network
Protection settings are derived from the feeder, the fault levels and the devices around this one. A default settings file is a starting point, not an answer.
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The reclose sequence is a decision
The reclosers we supply operate on an O-0.1s-CO-2s-CO-2s-CO sequence as standard. Whether that suits your feeder depends on the loads on it.
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Sensitive earth fault needs care
SEF settings that are too sensitive cause nuisance operations, too coarse and high-impedance faults are never detected.
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Every element gets proven
Configuring an element and testing an element are separate steps. Both happen before handover.
Related services
Need relay protection configured?
Tell us what you need and where the site is, and we will scope the work and quote it.