When questions arise about the integrity of installed medium-voltage cables, the financial consequences can be enormous. Concerns about installation damage, excessive bending, or insulation condition can lead to replacement costs reaching millions of dollars and significant project delays. Yet an installation concern doesn’t necessarily mean every cable in question has an electrical defect.
Before committing to extensive replacement, owners and contractors need reliable technical information to better assess cable condition and determine where corrective action may be warranted.
Turning Uncertainty into Informed Decisions
On a recent major electrical installation, concerns arose that certain medium-voltage cables had been subjected to excessive bending during installation. Facing the possibility of extensive and expensive cable replacement, the project team needed to assess the potential impact on insulation integrity and long-term reliability.
Potencia Partners was engaged to perform independent online partial discharge (PD) testing. Our engineers evaluated dozens of energized three-phase cable circuits under normal operating conditions, without taking the tested circuits out of service.
Testing found no detectable partial discharge patterns above background electrical noise in most circuits, while identifying a limited number of areas requiring further investigation. Detailed analysis helped localize specific discharge sources, allowing the project team to focus on potential problem areas rather than treating the entire installation as defective.
The results provided objective technical evidence to support discussions between project stakeholders, evaluate targeted corrective measures, and establish a baseline for future monitoring. While testing cannot guarantee future cable performance or substitute for following the manufacturer's installation requirements, it can substantially reduce uncertainty when evaluating costly corrective options.
Better Information. Lower Risk. Potentially Significant Savings.
Both offline and online partial discharge testing can identify electrical activity associated with insulation defects in cables, terminations, and related accessories. Selecting the appropriate testing method depends on several factors, including the project timeline, quality requirements and procedures, and the international standards the project must follow. Online testing allows owners, EPC contractors, and operators to assess potential problems while the tested circuits remain in service, avoiding the disruption and expense of a planned outage for testing.
The value extends beyond identifying defects. Independent diagnostic results can help avoid unnecessary cable replacement, reduce project delays, resolve technical disagreements, and provide a foundation for ongoing condition monitoring. Follow-up testing can also help determine whether identified discharge activity is stable or changing over time.
Potencia Partners combines specialized diagnostic equipment, experienced engineers, and international field-service capabilities to help clients make better-informed decisions about their medium-voltage cable systems.
A relatively small investment in testing can help prevent a much larger, unnecessary expenditure during commissioning, throughout the warranty period, and later in service. By replacing uncertainty with reliable technical information, clients can protect their budgets, schedules, and long-term equipment investments.
Contact Potencia Partners to learn how online partial discharge testing can help protect your next project or existing facility.