When a circuit breaker fails, the risks go beyond equipment damage. Breaker failures can result in prolonged outages, safety hazards, and costly unplanned downtime. As critical protective devices, circuit breakers must operate reliably to interrupt faults and protect transformers, generators, and the grid itself.
That’s why condition-based maintenance (CBM), supported by laboratory diagnostics, is so important. At TJ|H2b, our Breaker Oil Assessment, BOA®, is a proprietary diagnostic program designed to deliver precise, actionable insight into circuit breaker condition. Instead of relying solely on time-based maintenance cycles, BOA® enables utilities and industrial operators to monitor true breaker health, detect deterioration, and plan interventions before failure occurs.
What is BOA® Diagnostic Testing & What Does it Cover?
With over 25 years of expertise, TJ|H2b is a leader in developing and applying condition-based maintenance (CBM) programs across the high-voltage power industry. Our Breaker Oil Assessment (BOA®) program goes beyond simple oil sampling to give operators a comprehensive picture of circuit breaker condition.
1. Comprehensive Test Suite
BOA® incorporates multiple diagnostic parameters:
- Moisture & dielectric strength testing: identifies moisture contamination that lowers insulating performance.
- Dielectric Breakdown voltage & power factor: measures the insulating ability of the oil and flags deterioration.
- Acidity & sludge formation analysis: detects chemical byproducts that can corrode internal components and hinder breaker operation.
- Particle analysis: reveals contamination levels, such as metallic particles, carbon, or other debris that indicate wear, arcing, or contact erosion.
- Dissolved Gas Analysis: provides insight into fault activity and internal arcing events.
These test results are integrated into a diagnostic evaluation that considers equipment history, operating environment, and trends over time.
2. Proprietary Condition Coding & Trends
Each breaker is assigned a condition code (1–4 or 4*) that reflects the degree of oil degradation or fault activity.
Trend analysis is essential: watching how parameters shift over time allows early identification of developing issues, so operators can act proactively instead of reactively.
3. Independent, Purely Diagnostic Testing
Like all TJ|H2b services, BOA® is independent. We do not perform maintenance or repair work. Our role is clear: honest diagnostics and expert consultation. This avoids conflicts of interest — you get trusted results and recommendations without sales pressure.
4. Standardized Sampling
Accurate results require proper sampling. BOA® is conducted using industry standards (ASTM D923 or equivalents), ensuring samples are representative of in-service conditions. With 11 laboratory facilities worldwide, TJ|H2b provides regional coverage, quick turnaround, and emergency consultation when needed.
What is Condition-Based Maintenance (CBM)?
CBM means performing maintenance only when an asset’s actual condition indicates it’s necessary. For circuit breakers, that means using diagnostic insights from BOA® to determine when oil processing, contact inspection, or overhauls should be scheduled.
This contrasts with preventive (calendar- or usage-based) maintenance and reactive (post-failure) maintenance. With CBM, utilities avoid unnecessary maintenance costs while catching deterioration early enough to prevent catastrophic failure.
Maintenance costs may be reduced by as much as 92% depending on the type of breaker maintenance program currently being used to perform insulating oil testing and analyze the oil. As an example, compare a six-year fixed-interval maintenance program to a condition-based program that results in an average maintenance interval of ten years. In this example, the annual average condition-based maintenance would be sixty percent of the maintenance performed using the fixed interval approach. Breaker maintenance would be reduced by 40% using the Breaker Oil Analysis.
How TJ|H2b Uses BOA® for Circuit Breaker Reliability
BOA® evaluations provide a structured framework for breaker health management:
- Baseline Assessment: Establishes the current health rating of circuit breakers.
- Condition Rating & Thresholds: Defines when intervention is required (oil processing, inspection, or replacement).
- Trend Monitoring: Tracks breaker oil and internal wear over time.
- Decision Support: Provides actionable recommendations that utilities can integrate directly into asset management systems.
The result: better reliability, reduced downtime, and longer equipment life.
Getting the Most from Breaker Oil Assessment®
Circuit breakers are frontline defenders of the electrical grid — but like transformers, they are often overlooked until problems occur. BOA® offers a cost-effective way to detect risks before they escalate, ensuring both safety and operational continuity.
At TJ|H2b, our mission is to empower utilities with clear, data-driven insights. BOA® embodies this approach: comprehensive diagnostics, rigorous testing, and independent analysis that help clients act before failure.
Reliability, cost savings, and safety all begin with understanding the true condition of your circuit breakers. That’s exactly what BOA® delivers.
Contact us today to learn more about BOA® diagnostic testing.
FAQs
Q1. How is BOA® different from standard oil testing?
BOA® goes beyond simple oil checks. It combines multiple analyses and turns them into a coded condition rating with recommendations.
Q2. How often should breaker oil be tested?
Testing frequency depends on the breaker’s condition, criticality, and history. Intervals may range from annually to more frequent if issues are detected.
Q3. Can BOA® detect problems not visible in field inspections?
Yes. Issues such as internal arcing, moisture contamination, sludge buildup, or contact wear often show up in diagnostic testing long before they become visible or cause malfunctions.
Q4. Is BOA® applicable to all oil-filled circuit breakers?
Yes. BOA® is designed for oil-filled breakers of various sizes and voltage classes. For newer vacuum or SF₆ breakers, different diagnostic approaches are required.
Q5. Is the cost of BOA® justified compared to scheduled maintenance?
Absolutely. The investment in diagnostic testing is far less than the cost of breaker failures, emergency replacements, and outage-related downtime. BOA® helps utilities optimize resources while safeguarding reliability.
