Medium Voltage Installation Design

A new facility, capacity increase or MV switchgear renewal needs a defined electrical boundary before equipment is selected. Identify the utility connection, ownership and metering limits, existing supplies and any generation or backup source. Pow-Sys prepares the agreed drawings, studies and project submission support for installations in Türkiye, using the actual connection and site information.

Nominal network voltage, equipment rated voltage and insulation duties are separate inputs. Current rating alone does not establish suitability: fault interruption, peak and short-time withstand, operating conditions and manufacturer limits also matter. A generic voltage-class label is not a complete equipment specification.

Share the location, whether this is a new installation or a revision, installed and demand power, load operating profile, transformer data and existing single-line diagram. Add the connection opinion or energy permission, previous approved drawings, utility correspondence, equipment files and available test reports. Missing information is recorded as an open input; it need not prevent an initial discussion.

A survey can identify cubicle labels, cable entry and routes, maintenance access and differences between drawings and the installation. Visual observations are distinguished from new earth measurements, cable tests or relay injection. Any measurement, outage or test requirement and the responsible party are agreed separately.

The single-line diagram describes electrical connections and protection boundaries. A layout shows physical equipment positions, cable routes and access. Cubicle numbers, equipment schedules, CT/VT circuits and protection descriptions should remain traceable across the same document revision. Space reserved for expansion, an equipped spare feeder and a verified extension interface are different provisions.

Load and voltage-drop studies, cable ampacity and fault withstand, minimum and maximum fault cases and protection coordination share inputs. Motor starting, generation, transformer impedance and existing relay/breaker details can change the result. A fixed spare-capacity percentage or one fault-current value does not establish suitability for every operating condition.

Grounding work considers the soil model and its verification, fault-current return and sharing paths, clearing scenarios, surface layers and accessible touch, step and transferred voltages. One resistance result does not represent all these checks. Surge arresters and insulation coordination also depend on the actual system and manufacturer information.

Retaining an existing enclosure or busbar requires more than selecting a breaker with a higher current rating. Mechanical interfaces, insulation and fault duties, interlocks, CT performance, auxiliary supplies and protection/control compatibility must be assessed. Outage limits, staged construction and temporary supplies affect the agreed design. An uninterrupted changeover is not assumed.

The connection provider, authorized project-approval body, installation acceptance and energization decisions have different roles. The applicable route depends on the facility and connection scope. The Ministry of Energy authorization table supports identifying the relevant authority; TEDAŞ or TEİAŞ is not automatically the approval body for every MV consumer installation. Professional registration processes are separate from an installation approval or acceptance decision.

Pow-Sys prepares the agreed technical file and revision responses. The proposal identifies whether submission assistance, charges, authority follow-up, acceptance documentation and site attendance are included. An approved drawing or a completed checklist does not demonstrate that site tests have been performed or energization permission has been granted.

The document register identifies included diagrams and layouts, calculation notes, equipment and cable schedules, protection study files and correspondence. Record the document number, revision, design inputs and unresolved items. Authority comments, equipment substitutions and site changes should be reflected in the affected drawings and studies together. An as-built package depends on receiving and checking actual installation changes.

A new installation and a revision require different work. Supply and cubicle counts, cable routes, study depth, incomplete records, survey work and authority revisions affect the proposal. Equipment supply, installation, measurements, testing, outage arrangements and acceptance support are separately defined work items. Compare the deliverable list, included revisions, site work and exclusions alongside the total fee.

For a survey or discussion request, send the site and transformer information, connection status and available drawings. The visit date is confirmed by mutual agreement. Where transformer placement, primary/secondary systems and building interfaces need coordinated design, the transformer substation design scope can be assessed within the same proposal.