Articles
HV Operation Responsibility Cost: 2026 EMO Tariff, Quote Inputs and Scope
Check Türkiye’s 2026 EMO minimum tariff, quote inputs, included work, taxes and contract scope for high-voltage operation responsibility.
YGTIS and Operation Manager Verification: Training, Renewal, SMM and Appointment
Verify a YGTIS engineer in Türkiye: EMO code or barcode, current renewal status, diploma and transcript conditions, SMM-BT and site appointment.
Transformer Operation Manager Duties: Actions, Records, Reports and Employer Follow-up
Understand the responsible HV engineer’s duties in Türkiye: inspections, reports, maintenance coordination, employer actions and appointment changes.
HV Operation Responsibility in Türkiye: Scope, Appointment and Special Cases
When is HV operation responsibility required in Türkiye? Check the above-1 kV boundary, employed or external engineer route, shared sites and records.
What Is a DC Insulation (Megger) Test? What Does It Do, How Is It Performed and Why Is It Used?
What is a DC insulation megger test, what does it do and how is it performed? The operating logic of this method that measures insulation resistance with DC test voltage, which equipment it is used on, what a megger device measures, its difference from a hipot test, evaluation approach and points requiring attention are explained in plain language.
What Is an AC Insulation Test Performed with Tan Delta and Capacitance Measurement? What Does It Do, How Is It Performed and Why Is It Used?
How is an AC insulation test performed with tan delta and capacitance measurement and what does it do? The operating logic, difference from a conventional AC hipot test, application areas, advantages and points requiring attention of capacitance and tan delta measurements performed through an AC-based dielectric diagnostic approach are explained in plain language.
DC Hipot Testing: Suitability, Current and Result Limits
Understand DC withstand testing, IR and VLF differences, main insulation versus sheath scope, current components, test inputs and the limits of a pass.
VLF Cable Testing: Withstand, Diagnostics and Waveforms
Understand VLF withstand, tan delta and PD evidence, waveform and RMS/peak differences, frequency and capacitance ratings, report scope and result limits.
Unit Protection Relays: Zones, Measurements and Trip Paths
Understand generator and transformer protection zones, CT and VT roles, differential security and trip paths before choosing a unit protection relay.
Unit Protection Relay Testing: Scope, Evidence and Restoration
Plan unit protection tests around approved settings, CT and VT paths, differential security, trip logic and documented restoration after the work.
What Tests and Maintenance Are Required for Breaker Failure and Busbar Protection Relays?
What tests and maintenance are required for breaker failure and busbar protection relays? Busbar differential characteristic verification, zone and check zone tests, breaker failure start logic, retrip and backup trip circuits, CT chain, disconnector status information, binary inputs and outputs, event records and periodic maintenance steps are explained in plain language.
What Are Breaker Failure Protection and Busbar Protection Relays? What Do They Do, How Do They Work and Why Are They Used?
What are breaker failure protection and busbar protection relays, what do they do and how do they work? Breaker failure protection and busbar differential protection logic, internal and external fault distinction, zone selection, trip scenario, CT information and their effects on switchyard safety are explained in plain language.
What Tests and Maintenance Are Required for Overcurrent and Earth Fault Protection Relays?
What tests and maintenance are required for overcurrent and earth fault protection relays? Secondary injection, pickup and time curve verification, I>, I>>, I0>, I0>> stages, CT and CBCT chain, directional earth fault protection test, trip circuit, binary inputs/outputs and periodic maintenance steps are explained in plain language.
What Is an Overcurrent and Earth Fault Protection Relay? What Does It Do, How Does It Work and For What Purpose Is It Used?
What is an overcurrent and earth fault protection relay, what does it do and how does it work? Phase overcurrent and earth fault protection logic, I>, I>>, I0>, I0>> stages, IDMT and instantaneous trip structures, residual current measurement, application areas and protection coordination are explained in plain language.
What Is a Protection Relay? How It Works and Types
What is a protection relay and how does it work? Fault detection, trip logic, overcurrent, earth fault, differential and distance relay types explained.
Relay Setting Calculations: Inputs, Functions and Coordination
Understand function-specific relay settings, CT/VT bases, pickup, curve identity, backup paths and the evidence linking studies to commissioned devices.
Short-Circuit Analysis: Fault Current, Peak and Equipment Duty
Learn how fault type, maximum and minimum current, AC RMS, DC offset, peak and equipment duty differ, with an explicitly limited transformer example.
Power Quality Analyzer Testing, Calibration and Maintenance
Analyzer inspection, calibration, sensor-chain and event-function tests; preserve as-found results and report uncertainty, data gaps and the tested scope.
What Is a Power Quality Analyzer? Functions and Selection
Power quality analyzer functions, disturbance records and harmonics; choosing inputs, sensors, recording settings and a measurement plan with clear limits.
Electricity Meter Testing and Maintenance: A Clear Scope
Review meter circuits, CT and VT ratios, data and comparison tests while separating maintenance, calibration, adjustment and legal verification.
What Is an Electricity Meter? Types and How It Works
Understand electricity meters, kW and kWh, CT/VT ratios, demand and smart reading, with practical checks for selecting and verifying a meter.
Power Factor Correction Testing and Maintenance
Understand capacitor-bank, contactor, reactor and controller checks, with measurement conditions, safety boundaries and maintenance reporting.
What Is Power Factor Correction? Types and Sizing
Learn how power factor correction works, how fixed and automatic banks differ, and when kvar calculations and harmonic studies apply.
OLTC Testing and Maintenance: Checks, DRM and Reporting
Learn how OLTC design, motor drive, oil, protection signals and DRM records shape model-specific maintenance and assessment.
What Is an OLTC? Operation, Components and Tap Direction
Learn how on-load tap changers support voltage regulation, how switching designs differ, and how they compare with off-circuit tap changers.
Metal-Clad Switchgear Maintenance: Tests, Scope and Reports
Define metal-clad switchgear maintenance: drawout breaker, shutters, interlocks, primary and secondary tests, thermal and PD limits, intervals and reporting.
What Is Metal-Clad Switchgear? Construction and Operation
Understand metal-clad compartments, breaker positions, the protection chain and IEEE/IEC classifications, with rating, internal-arc and selection checks.
RMU Maintenance: Checks, Testing and Service Records
Plan RMU interlock, gas indicator, cable, protection and insulation checks, with thermal/PD limitations, maintenance intervals and post-test restoration.
What Is an RMU? Ring Networks, Functions and Selection
Understand RMU functions, open and closed rings, switch-fuse and breaker feeders, insulation, IAC/LSC ratings and the information needed for selection.
MV Cable Termination Maintenance: Tests and Inspection
Plan MV cable termination maintenance: kit and interface checks, cleaning, bonding and thermal inspection, IR/VLF/tan delta/PD test limits and reporting.
MV Cable Terminations: Types and Selection
Understand MV cable terminations: joint differences, U0/U(Um), insulation diameter, separable interfaces, kit contents and installation/test evidence.
MV XLPE Cable Testing and Maintenance: Scope and Evidence
Understand the different roles of sheath tests, IR, VLF, TD, PD and thermal inspection, with clear limits for cable assessment and reporting.
Transformer Differential Relay Testing and Maintenance
Define transformer differential relay test scope: secondary injection, CT circuits, bias, harmonic logic, REF, trip paths, COMTRADE and reports.
Transformer Differential Protection (87T): Operation and Limits
Understand 87T current comparison, CT boundaries, inrush security, REF and the trip chain, with a ratio-only transformer example and clear limits.
MV XLPE Cable: Construction, Voltage Ratings and Selection
Understand MV XLPE cable layers, U0/U(Um) ratings, insulation choices, current capacity and the dimensions needed for compatible terminations and joints.
Distance Relay Testing and Maintenance: Scope and Evidence
Plan distance relay loop, reach, direction and timing tests with clear CT/VT, trip-chain, pilot-channel, replay and restoration evidence.
Distance Protection Relay: Zones, Mho, K0 and Limits
Understand distance relay fault loops, zone coordination, mho and quadrilateral behaviour, earth compensation, infeed, power swings and CCVT limits.
HV Operation Responsibility: Meaning, Boundaries and Roles
Understand Turkey's HV operating responsibility: installation boundaries, YGTIS and SMM eligibility, employer duties and its difference from transformer maintenance.
What Tests and Maintenance Are Required for Transformers?
What tests and maintenance are required for transformers? Visual inspection, oil and insulation health, DGA, ratio test, winding resistance measurement, bushing checks, thermal inspection, OLTC, cooling equipment and dry-type transformer cleaning and maintenance steps are explained in plain language.
Line Trap Testing and Maintenance: Scope and Reports
Plan line-trap coil, tuning-unit and connection checks. Distinguish DC resistance, RF blocking, thermal findings and PLCC or teleprotection tests.
High-Voltage Line Testing and Maintenance: Scope and Findings
Assess overhead-line patrols, structures, conductors, insulators, OPGW, thermography and clearances with clear evidence, work boundaries and reporting limits.
Line Traps: PLCC, Tuning and Test Scope
Understand line-trap operation, coupling, tuning bands and ratings, and the difference between device, PLC channel and protection-scheme checks.
High-Voltage Lines: Components and Inspection
Understand high-voltage line components, sag, wind loading, shield wires, inspection records and clearances, with voltage class and network role separated.
Insulator Testing and Maintenance: Inspection and Decisions
Inspect porcelain, glass and composite insulators. Understand cleaning, hydrophobicity, leakage current, thermal/UV limits and replacement reporting.
What Is an Insulator? Function, Types and Selection
What is an insulator and what does it do? Electrical insulation and mechanical support, porcelain, glass and composite insulator types and selection.
What Tests and Maintenance Are Required in Transformer Substations?
What tests and maintenance are required in transformer substations? The main maintenance and test steps in a transformer substation are explained in plain language, including power transformers, circuit breakers, disconnectors, earthing switches, instrument transformers, surge arresters, protection relays, grounding system, auxiliary DC supplies and thermal checks.
Earthing Switch Testing and Maintenance: Scope and Evidence
Plan earthing switch maintenance around the installed design, interlocks, indications and permitted measurements, with model-specific limits and clear records.
Earthing Switches: Function, Interlocks and Ratings
Understand MV/HV earthing switches: isolation versus grounding, making and withstand ratings, indication limits, interlocks and portable earthing equipment.
What Is a Transformer Substation? What Does It Do, How Does It Work and Which Sections Does It Consist Of?
Understand transformer substation equipment, bays and types, with an industrial load example, building requirements and earthing assessment limits.
What Is a Transformer? Operating Principle, Types and Applications
A transformer converts the voltage level of AC power by electromagnetic induction. Working principle plus power, distribution, dry-type and oil types explained.
High Voltage: Definitions, Ratings and Measurement
Understand high voltage, Turkey’s AC phase-to-phase RMS definition, MV terminology, equipment ratings and a constant-power loss example. Separate measurement from proving dead.
Surge Arrester Testing and Maintenance: Evidence and Limits
Distinguish housing checks, leakage current, counters, thermography and permitted IR tests when planning model-specific surge arrester maintenance.
What Is a Surge Arrester? Types, Ratings and Selection
Learn how MOV surge arresters work, how MV/HV arresters differ from LV SPDs, and how MCOV, TOV, residual voltage and installation affect selection.
What Tests and Maintenance Are Required for Disconnectors?
Disconnector maintenance: device duties, selected checks, contact and insulation results, interlocks, position feedback, report limits and corrective-action records.
What Is a Disconnector? Isolator, Load Break and Earthing Functions
Disconnector and isolator functions, load break and earthing switch differences, position-indication limits and selection inputs for MV/HV facilities in Turkey.
What Tests and Maintenance Are Required for Circuit Breakers?
Circuit-breaker maintenance: selected tests, equipment-specific precautions, result interpretation, report fields and checks before an authorized return to service.
What Is a Circuit Breaker? MV Duties, Ratings and Vacuum/SF6 Types
Circuit breaker duties, vacuum and SF6 interruption, relay trip chains, RMS/peak ratings and withdrawable positions explained for facilities in Turkey.
What Tests and Maintenance Are Required for Voltage Transformers?
What tests and maintenance are required for voltage transformers? Visual inspection, cleaning, primary fuse and connection checks, secondary circuit verification, ratio and polarity tests, burden assessment, insulation tests and capacitance and dissipation factor checks for CVTs are explained in plain language.
What Is a Voltage Transformer? What Does It Do, How Does It Work and Where Is It Used?
What is a voltage transformer and what does it do? Operating principle, parallel connection, secondary voltages, inductive and capacitive VT types explained.
What Tests and Maintenance Are Required for Current Transformers?
What tests and maintenance are required for current transformers? Visual inspection, cleaning, connection checks, ratio test, polarity test, accuracy check, burden assessment, insulation, excitation and primary injection verification are explained in plain language.
What Is a Current Transformer? What Does It Do, How Does It Work and How Is It Selected?
What is a current transformer, what does it do and how does it work? The operating principle of current transformers used for measurement and protection, 1 A and 5 A secondary structures, current transformer ratio, accuracy class, burden value, connection rules and selection criteria are explained in plain language.