Bursa High Voltage (HV) and Medium Voltage (MV) Services

Facilities operating at high-voltage (HV) and medium-voltage (MV) levels in Bursa and the surrounding region, such as factories, industrial organizations in organized industrial zones, power generation facilities, large commercial buildings and infrastructure projects, need regular testing and maintenance. The services described on this page cover field testing, maintenance and repair works for your HV/MV lines, cables and switchgear. For related context, see Bursa Transformer Periodic Inspection and Testing.

For privately transformer-fed facilities in Bursa OIZ, DOSAB, Nilufer OIZ, Hasanaga, Kayapa, Kestel, Gursu, Inegol, Gemlik and the surrounding region, the HV/MV maintenance and testing scope is determined according to energy continuity, production schedule, equipment age, fault history and existing maintenance records. For related context, see Bursa Lightning Protection Periodic Inspection.

While transformer operation responsibility or HV operation responsibility services mainly focus on regulation-compliant operation and signing responsibility, the service we provide here includes technical tests, maintenance applications and, when necessary, repair works that reveal the equipment-level health condition of your HV/MV installation. It can also be configured together with transformer operation responsibility service for transformer-substation-specific operating processes; the two services complement each other but their scopes are different. For related context, see Bursa Electrical Installation Periodic Inspection.

The work process generally starts with a site survey. The current condition of your HV/MV lines, cables, MV switchgear, transformers and grounding arrangements is examined; single-line and protection diagrams are reviewed. At this stage, risky areas, access limitations and the outage plan required for maintenance are determined. For related context, see Bursa Battery Periodic Inspection.

In MV switchgear and panel maintenance, circuit breakers (SF6, vacuum, oil), disconnectors, load break switches, surge arresters, instrument transformers and busbar-cable connections are subjected to visual, mechanical and electrical tests. Interlocking systems, mechanical interlocks and control circuits are checked; oil, gas or vacuum levels are reviewed when necessary. Detailed tests and oil analyses to be carried out on transformers are performed through our Bursa transformer maintenance, testing and oil analysis services.

In HV/MV cable tests, insulation resistance measurements, VLF or similar high-voltage withstand tests when necessary, sheath tests and phase sequence/length measurements are carried out. In case of suspected fault, special devices are used for cable fault location and the fault location is narrowed down before excavation.

Grounding and lightning protection systems are evaluated through grounding resistance and soil resistivity measurements, step and touch voltage calculations, lightning protection tests and connection continuity checks. In this way, it is ensured that fault current flows safely to earth during HV/MV faults and personnel are protected. These tests are also fundamental inputs for periodic inspection and examination reports.

During thermal camera inspections, MV switchgear busbars, cable terminations, transformer connections, disconnector-circuit breaker contacts and panel internal connections are scanned. Points heating above normal may indicate problems such as loose connections, load imbalance or equipment ageing. These points are highlighted separately in the report.

All data obtained during maintenance and testing works are interpreted by taking the relevant standards (TS/IEC series), manufacturer recommendations and the risk profile of your facility into account. Short-, medium- and long-term action recommendations are prepared for values close to critical levels; in this way, budget planning and outage management become more predictable.

In HV/MV repair works, interventions such as cable joint and termination renewal, connection and bushing replacements, mechanical revisions of circuit breakers and disconnectors, surge arrester and instrument transformer replacements, and rearrangement of busbars are planned according to the type of fault detected. Coordination is provided with manufacturers or authorized services when necessary.

For newly commissioned HV/MV installations, we provide commissioning services such as post-assembly acceptance tests, testing of function and switching scenarios, testing of protection relay and interlocking chains, and preparing a report confirming that the installation is ready to be energized. For new facility projects and capacity increases, we work together with our LV/MV/HV project design and consultancy team.

At the end of all maintenance, testing and repair activities, a detailed report is prepared including measurement results, devices used, field notes, photographs and thermal images when necessary. The report includes both the existing condition assessment and improvement recommendations; it can be used as a reference in official inspections.

The HV/MV maintenance interval is determined according to the facility type, loading level, environmental conditions and previous test results. The general approach is to plan comprehensive maintenance and testing at least once a year, and additional intermediate inspection visits for critical facilities. For facilities in Bursa and the surrounding region, we aim to minimize production loss by creating the maintenance plan together. If you wish, this plan can be integrated with the HV operation responsibility contract.

The service fee is calculated on a project basis according to line and cable lengths, number of MV switchgear cubicles, number of transformers, requested test types, site location and planned outage duration. After the site survey, we prepare clear and comparable proposals for different scope options.