Last updated: October 24, 2026
Technical contact: Hüseyin ÇOKAL, Electrical and Electronics Engineer. Content updated: October 24, 2026.
What changed: Service scope, report outputs, official sources, pre-proposal information and technical transparency notes were reviewed for the current period.
High Voltage Installations Engineering and Consultancy Summary
- Define switchyard, substation, line and cable boundaries together with connection points and ownership/operator interfaces.
- Assess primary equipment duties alongside CT/VT, protection, trip paths and auxiliary supplies.
- Identify the inputs and separate studies needed for grounding, line/cable interfaces, coordination and SCADA/RTU.
- Link drawing and setting revisions to actual equipment identities and maintain a traceable findings and open-item list.
- Describe commissioning support through explicit testing, witnessing, operator and energization responsibilities.
- Keep installation, repair, physical testing, additional design and statutory operating responsibility separately scoped.
Technical contact and professional information
High Voltage Installations Engineering and Consultancy Scope
Start with the installation interfaces
A switchyard, substation, overhead line, underground cable and connected generation or consuming facility can have different responsibility boundaries. Define the decisions and interfaces to be assessed before starting. The above-36kV focus used on this service page is not a universal regulatory definition or the threshold for statutory operating responsibility.
Topology and network information
Record the single-line revision, normal and alternative supplies, bus couplers, parallel sources and connection points. Applicable fault-level data, grounding arrangement, transformer impedances and operating scenarios provide inputs to the selected study. Unverified conditions remain assumptions rather than being silently treated as the installed state.
| Interface | Information to establish |
|---|---|
| Network and facility | Connection point, operator, fault data and operating scenarios |
| Primary and secondary systems | Equipment identities, CT/VT properties, connections and protection functions |
| Protection and breaker | Trip path, DC source, breaker duty and verification endpoint |
| SCADA/RTU and field | Point list, command/feedback, local/remote authority and timing |
| Testing and energization | Method, boundary, witnessing, open items and responsible decision-maker |
Match primary equipment to its duty
Review the actual duties of breakers, disconnectors, CT/VTs, arresters, busbars, insulators and cable interfaces. Nominal network voltage, equipment voltage/insulation class, breaking/making duty and short-time withstand are different inputs. One rating does not establish complete suitability. Detailed selection or calculation requires applicable product documentation and criteria.
Protection coordination and instrument circuits
Assess sensitivity, selectivity, speed and security for the chosen operating and fault scenarios. Actual CT/VT ratio, polarity, phase relationship, class/burden, relay model and setting revision matter. Example curves or settings cannot be transferred directly to another site. Coordination does not guarantee that only one section will trip or that all healthy sections will remain continuously supplied in every fault.
Trip commands, interruption and auxiliary power
The relay output, trip wiring, DC source, breaker mechanism and feedback are separate parts of the chain. Operation of an output contact does not establish the breaker’s ability to interrupt the actual fault duty. Battery terminal voltage or one trip operation is not evidence of capacity for the complete duty period. State the endpoint reached by the test plan.
SCADA, RTU and communication boundaries
Review point identities, addresses, scaling, quality/time information, local/remote authority and command/feedback relationships where included. A value displayed on SCADA does not prove the entire chain from sensor to endpoint. Where communication or IEC61850/GOOSE is involved, define the actual architecture, configuration and end-to-end verification boundary.
Grounding and touch/step assessment
Connections, network topology, fault-current distribution, clearing time and soil model provide inputs to the applicable study. Continuity or an electrode-resistance reading is different from touch/step assessment. Arrester selection also depends on grounding, voltage conditions, insulation coordination and product duty. No universal resistance or clearance value is inferred.
Line, cable and connection systems
Overhead-line review may address route, environment, mechanical condition and clearances. Cable work may examine ampacity, short-circuit duty, screen bonding, termination/joint interfaces and installation conditions. Design calculations and field measurements have different deliverables. A public example drawing does not establish safe approach distance, sag or test voltage for every installation.
Drawing/site comparison and revision control
Relate single-lines, layouts, secondary diagrams, cable schedules, relay settings and SCADA points to equipment identities. Discrepancies and connections that cannot be verified remain open. A marked-up field drawing is not automatically an approved as-built; establish who revises, checks and delivers the final documents.
Limits of studies and diagnostics
Short-circuit, load-flow, coordination, arc-flash or insulation-coordination studies are selected where needed. Thermal, PD and power-quality measurements have their own methods and operating conditions. Absence of an observed diagnostic indication does not establish defect-free equipment or remaining life. A calculation model is not presented as a completed field verification.
Safe work and authorized decisions
Access, isolation, grounding, work permits, approach boundaries and switching follow the facility’s authorized plan. A consultancy report is not a work permit or a general live-working procedure. Confirm applicable professional documentation, contract and operating-responsibility conditions for the actual work and installation.
Describe commissioning support precisely
Separate document review, test execution, witnessing and interpretation responsibilities. Define methods, criteria, connection boundaries and expected records beforehand. Project approval, site acceptance and the operator’s energization decision remain distinct processes. Track open items, approved settings/configurations and removal of temporary test arrangements with their responsible persons.
Technical deliverables and follow-up
Deliverables may include review or calculation reports, drawing/site discrepancies, coordination notes, interface lists or commissioning open items. Identify each deliverable’s inputs, revision and limits. A recommended repair or setting change is not recorded as implemented; completion and any reverification need their own evidence.
Information for a scoped proposal
Share location, voltage level, switchyard/substation and line/cable boundaries, operator and connection point, available documents and the required decision. Define studies, tests, outages, field attendance and authority interfaces as included or separate work. A new project, modification and existing operating problem need different task allocations rather than one presumed package.
Reporting, Inspection and Proposal Preparation
Sample Inspection Table
This table summarizes which headings are evaluated on site and which outputs may appear in the report.
| Inspected area | Checked criterion | Report output |
|---|---|---|
| Site and equipment condition | Existing equipment structure, access conditions, visible risks and operating conditions | Site inspection note and prioritized findings list |
| Document and project conformity | Single-line diagram, current project, labeling, reports and conformity with site implementation | Document conformity assessment and missing record list |
| Safety and operational risk | Life safety, equipment safety, energy continuity and maintenance access risk headings | Risk classification and corrective action recommendations |
| Measurement, test or inspection need | Measurement, test, visual inspection and technical review items required by the service scope | Measurement/test plan or inspection scope note |
| Reporting and follow-up | Nonconformity priority, follow-up date, responsibility allocation and next steps | Photo-supported report, action list and follow-up recommendation |
Engineering Assessment and Separate Field Work
The proposal defines the HV engineering review, calculations, site assessment and commissioning support included in this service. Physical tests and implementation are distinguished from interpretation of their results.
| Work item | Relationship to the service | Scope decision |
|---|---|---|
| Agreed engineering review and calculations | Project-site compatibility, protection coordination and technical findings follow the selected engineering scope. | Assessments, calculation results and recommendations are delivered in the technical report. |
| Field measurements and equipment tests | Grounding, relay, insulation or other tests require suitable equipment, methods and site planning. | Actual testing is included only when specified in the proposal; reviewing existing results does not imply a new test. |
| Installation, repair and additional project work | Physical changes and work beyond the agreed review require their own implementation scope. | Materials, additional design, cost and timing are clarified before proceeding. |
Pow-Sys technical report template
Blank template — not a completed report. No customer information or measurement results are included.
| Heading | Record to be completed |
|---|---|
| Scope | [Areas, equipment and documents examined] |
| Method | [Applicable criteria, instruments and calibration information] |
| Finding | [Observed condition and supporting record] |
| Measurement | [Result, unit, method and report reference, if measured] |
| Assessment | [Applicable criterion and conclusion of the authorised inspector] |
Technical and Regulatory Sources
- EMO certificate verification portal
Claim supported on this page: EMO registration, SMM and certificate verification transparency.
- TEDAŞ official website
Claim supported on this page: Distribution infrastructure, project/acceptance processes and technical specification context.
- TEİAŞ official website
Claim supported on this page: Transmission system, connection and high-voltage infrastructure context.
- Electrical High Current Installations Regulation
Claim supported on this page: Installation, operation, maintenance and safety of high-current electrical installations.
Frequently Asked Questions
What is high voltage installations engineering service?
It is engineering support for defined project, equipment and primary-secondary interfaces and operating scenarios. The above-36kV focus on this page is a service convention, not a definition applicable to every regulation. Determine statutory responsibility conditions separately.
What does high voltage installations consultancy include?
Agreed document/site review, studies, protection or grounding assessment, drawing/site discrepancies and commissioning support may be included. State separately whether physical testing, servicing, installation and repair are part of the contract.
What documents are included in HV project documents and diagrams?
Single-lines, layouts, secondary and control diagrams, cable schedules, setting files and reports may be required. Identify revisions and equipment. A draft or marked-up field drawing does not automatically become an approved as-built.
Which facilities require high voltage engineering service?
New switchyards, substations, generation connections, line/cable projects and modifications may need support. The decision, voltage/topology, operator interface and available information determine the scope; the facility name alone does not.
What does HV switchyard and transformer substation engineering include?
Assess agreed primary equipment duties and interfaces with CT/VTs, protection/trip paths, grounding and auxiliary power. Ratings, design calculations, field measurements and functional tests are different evidence. Reviewing an item does not establish that it has been physically tested.
Why is operational safety important in high voltage installations?
Energy sources, approach limits, isolation, permits and switching must be managed through the authorized site plan. Consultancy may identify needs and observed gaps, but its report does not replace a work permit or authority to energize.
Do you provide support for EMO, SMM and EKAT processes?
A scope can be agreed for technical files and process requirements. Current professional credentials, operating responsibility and the authority’s approval/acceptance remit are different matters. Consultancy does not automatically secure every certificate or official outcome.
Do you perform technical inspection and risk analysis in HV installations?
Yes, within agreed equipment and access boundaries, using observations, records and any selected studies. State the basis and uncertainty of priorities. The assessment cannot exclude every concealed defect or operating scenario.
Do you provide commissioning support for high voltage installations?
The proposal can distinguish review, test execution, witnessing and interpretation. Establish test endpoints, criteria and records. Track removal of temporary arrangements and open items; energization decisions remain with the responsible operator and applicable process.
Which technical deliverables can be prepared after high voltage engineering work?
Review and calculation reports, discrepancy lists, coordination notes, interface schedules and open-item records may be delivered. Link them to actual inputs and revisions. Do not record unperformed tests or recommended corrections as complete.
Are high voltage engineering consultancy and HV operation responsibility the same service?
They are distinct services. Operating responsibility carries its own current eligibility and contract requirements; consultancy supports defined technical decisions. Even where coordinated, specify responsibilities, deliverables and records separately.
Do you provide high voltage engineering and consultancy services across Türkiye?
Requests outside Bursa can be assessed according to location, voltage/topology, access and operator coordination. Define field attendance, travel and deliverables in the proposal. This service offer is not evidence of completed projects nationwide.