Relay Upgrades: Modernizing Protection Systems in Oil and Gas Facilities

The relay panel in your switchgear room may look the same as it did years ago, but the risk it carries today has changed. Electromechanical relays have kept oil and gas facilities protected for decades, and they were correctly specified for the systems they were built to serve. What's changed is everything around them, from production demands to the safety standards and compliance requirements that now govern protection relay modernization.

Learn what aging protection systems could be costing you, what microprocessor-based relays deliver in their place, and what a well-executed relay upgrade actually looks like in an oil and gas environment.

The Cost of Aging Electromechanical Relays in Oil and Gas

Many oil and gas facilities are running protection systems built on electromechanical relays that have been in service for decades. That aging infrastructure was correctly specified for the conditions of its time, but three risks have been compounding ever since:

• Speed: Electromechanical relays typically clear faults more slowly than modern alternatives, so each fault releases more arc flash incident energy at the point of work, putting personnel in greater danger.

• Visibility: A protection failure can sit undetected for years, since these relays can't monitor their own health. In oil and gas, unplanned downtime carries costs well past the repair itself, from lost throughput to restart expenses and contractual penalties.

• Alignment: Relay settings configured at original commissioning were correct for the system as it existed then, but system modifications, added loads, and updated calculation methods mean those settings may no longer represent accurate protection today.

Key Benefits of Upgrading to Microprocessor Relays

The shift to microprocessor-based protection relay modernization can deliver measurable improvements in fault response, system visibility, and standards alignment.

Faster Fault Clearing and Arc Flash Mitigation

Under the Institute of Electrical and Electronics Engineers (IEEE) standard 1584-2018, incident energy is driven by available fault current, protective device clearing time, and working distance. The faster a protective device clears a fault, the less incident energy is released. Microprocessor relays can detect and interrupt faults faster than electromechanical relays and can offer far more flexibility in how protection schemes get configured, including tighter instantaneous settings, multiple setting groups, and zone-selective interlocking.

Electromechanical relays offer limited adjustment options and coarse setting granularity by comparison, so this combination of faster clearing and greater scheme flexibility gives engineers real tools to reduce arc flash hazard categories. Sometimes that means moving a worker from Category 4 personal protective equipment (PPE) down to Category 1 or 2.

Beyond scheme flexibility, microprocessor relays support key arc flash mitigation techniques during energized work. Maintenance mode settings, also called energy-reducing maintenance settings (ERMS), temporarily engage a reduced instantaneous overcurrent trip threshold while personnel work near energized equipment, lowering incident energy for the work window. A relay upgrade project reduced incident energy on a medium-voltage switchgear bus from 22.8 cal/cm² to 1.14 cal/cm² using this technique.

Remote circuit breaker operation through relay programming, using either a timed front-panel delay or Supervisory Control and Data Acquisition (SCADA), moves the operator out of the arc flash boundary during switching, which directly increases working distance. Under IEEE 1584-2018, the increase in working distance reduces the calculated incident energy.

Built-In Diagnostics and Remote Monitoring

Electromechanical relays have no embedded self-monitoring, so a relay can degrade or fail without triggering any alarm. The only way to catch that kind of failure is through scheduled testing, since the relay itself gives no warning in between. Microprocessor relays flip this equation because they continuously monitor their own hardware and firmware for anomalies.

When something looks off, the relay triggers an alarm through SCADA or local indication, giving maintenance teams a chance to respond before the issue affects protection during a real fault. This shrinks the gap between a relay developing a fault and someone finding out about it, which matters in oil and gas, where an undetected protection failure can turn a routine fault into both an electrical incident and a process safety event.

Beyond self-monitoring, microprocessor relays record the sequence of events, currents, voltages, relay operating times, and breaker operations in milliseconds. On a system built around electromechanical relays, a disturbance investigation typically starts with physical evidence and little else, so root cause analysis takes longer and leans more on inference. Event recording turns that process into a data-driven diagnosis and supports better protection coordination going forward.

SCADA integration extends this further because operators gain real-time visibility into relay status, metering data, and system health from the control room. Operators can also initiate remote circuit breaker operations that keep personnel outside the arc flash boundary during switching.

Meet IEEE and NFPA 70E Standards

Relay settings that were accurate at commissioning may no longer satisfy today's protection coordination requirements or IEEE 1584-2018 arc flash calculations. For example, studies performed under the older 2002 IEEE 1584 model can underestimate incident energy compared to the updated methodology, which means PPE requirements and equipment labeling can fall out of step with current standards. NFPA 70E requires arc flash risk assessments to be reviewed every five years or whenever a facility makes major system modifications.

NETA World Journal recommends building fresh short-circuit, coordination, and arc flash studies before programming new relay settings, rather than converting existing electromechanical settings directly, because microprocessor relays call for data suited to current system conditions. A relay upgrade offers a natural opportunity to realign your protection scheme with these standards at the same time.

Planning a Relay Upgrade with Minimal Disruption

Successful relay upgrade projects in oil and gas environments share these common planning strategies:

• Start with updated engineering studies: Before selecting or programming new relays, run a current short circuit analysis, protection coordination study and arc flash hazard analysis based on today's system configuration rather than the original commissioning drawings.

• Skip the direct settings conversion: Electromechanical relay settings shouldn't transfer directly into microprocessor relays, because the expanded functionality of digital relays calls for new programming built from updated study data.

• Bench test before energization: Complete relay programmer qualification, hardware configuration and logic verification off-site and fully tested before installation, since skipping this step is one of the most common sources of elevated risk during changeout.

• Schedule within a defined turnaround window: Plan the outage carefully and keep a qualified relay programmer on-site throughout the changeout rather than available by phone.

• Work with an integrated partner: Firms that handle both engineering studies and field installation eliminate coordination gaps between design and execution that extend timelines and introduce risk.

Choose Power Solutions Group for Your Industrial Microprocessor Relay Upgrade

Upgrading to microprocessor relays means your protection system matches how your facility runs today, so your team gets more margin for safety and fewer compliance gaps to track down.

Power Solutions Group brings the full scope of expertise this transition requires. Our NETA-accredited field technicians work alongside licensed electrical engineers to deliver relay, metering and control upgrades as a single coordinated project, covering protection coordination studies through installation, testing, and commissioning. With two decades of experience across power generation and oil and gas, plus arc flash safety training to support your team, we help build a more reliable, safer, and compliant protection system.

Contact our team and request a free site walk-through to get an expert look at your current protection scheme before you commit to a relay upgrade project.