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A Absolute error - абсолютная погрешность Absolute sensitivity - абсолютная чувствительность Absolutely selective protection system - система защиты с абсолютной селективностью Accelerated distance protection system - система дистанционной защиты с ускорением Acceleration - ускорение Acceleration of distance protection Acceptance tests – ускорение дистанционной защиты Accumulator - аккумулятор Accumulator discharge – разряд аккумулятора Accuracy - точность Accuracy class – класс точности Active energy – активная энергия Active power relay – реле активной мощности Addressing - адресация Adjacent coil – смежная катушка Adjusting - настройка Adjustment - настройка Adjustment range – пределы регулирования Admissible interrupting current - допустимый разрывной ток Admittance - полная проводимость Advance angle - угол опережения Adding connection - согласное включение Air-blast (circuit) breaker - воздушный выключатель Air-blast switch - воздушный выключатель Air gap - воздушный зазор Airtight - герметичный Air transformer - сухой трансформатор Alarm - сигнал Alarm lamp - сигнальная лампа Alarm relay - сигнальное реле Alarm signal - аварийный сигнал Algorithm - алгоритм Alignment - юстировка Alive - под напряжением Alkaline storage battery - щелочной аккумулятор All-or-nothing relay - реле двухпозиционное, реле логическое Allowable voltage –допустимое напряжение All-pass (universal) filter - универсальный фильтр Alternating component – переменная составляющая Alternating current - переменный ток Alternating current amplifier - усилитель переменного тока Alternating current circuit - цепь переменного тока Alternating-current measurement – измерение на переменном токе Alternating current relay – реле переменного тока Alternating current system / а.с system - электрическая сеть переменного тока Alternating voltage – переменное напряжение Ampere density – плотность тока Ampere-turns – ампер-витки Ampere-windings - ампер-витки Amplifier - усилитель Amplitude (of a symmetrical alternating quantity) – амплитуда периодической величины Amplitude modulation - амплитудная модуляция Amplitude-frequency characteristic - амплитудно-частотная характеристика Analogue relay - аналоговое реле Analogue - аналоговая Analogue-digital converter - аналого-цифровой преобразователь Analogue transducer - аналоговый преобразователь Angular frequency - угловая частота Anti-hunting relay - реле (защита) от асинхронного хода Antihunting transformer – стабилизирующий трансформатор Anti-pumping / devicenti-pumping – блокировка от скачков

Глоссарий электротехнических терминов

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A Absolute error - Absolute sensitivity - Absolutely selective protection system - Accelerated distance protection system - Acceleration - Acceleration of distance protection Acceptance tests Accumulator - Accumulator discharge Accuracy - Accuracy class Active energy Active power relay Addressing - Adjacent coil Adjusting - Adjustment - Adjustment range Admissible interrupting current - Admittance - Advance angle - Adding connection - Air-blast (circuit) breaker - Air-blast switch - Air gap - Airtight - Air transformer - Alarm - Alarm lamp - Alarm relay - Alarm signal - Algorithm - Alignment - Alive - Alkaline storage battery - All-or-nothing relay - , Allowable voltage All-pass (universal) filter - Alternating component Alternating current - Alternating current amplifier - Alternating current circuit - Alternating-current measurement Alternating current relay Alternating current system / . system - Alternating voltage Ampere density Ampere-turns - Ampere-windings - - Amplifier - Amplitude (of a symmetrical alternating quantity) Amplitude modulation - Amplitude-frequency characteristic - - Analogue relay - Analogue - Analogue-digital converter - - Analogue transducer - Angular frequency - Anti-hunting relay - () Antihunting transformer Anti-pumping / devicenti-pumping

Anti-reasonant circuit - (, ) Anti-torque Aperiodic component Aperiodic damping Aperiodic phenomenon - Aperture - Apparent - Apparent impedance seen by distance relay - Apparent power - Applied (impressed) voltage - Arc - Arc extinction- Arcing earth - Arcing time - Arc resistance - Arc-striking - Arc suppression coil - Arc voltage - Arc voltage drop - Armoured cable - Artificial mainsnetwork - Assembler program - Assymmetry coefficient - Astatic control - Astatic regulator - Asynchronism - Asynchronous - Asynchronous generator - Asynchronous operation - () Asynchronous running - () Atmospherics - () Atmospherics overvoltage - , Attachment - Attended substation - Attenuation (of a signal) - () Attenuation band - Attenuation characteristic - Attenuation due to ice-formation - Attenuation factor - Attenuation ratio - Attracted armature relays - Audio-frequency oscillator - Audio frequency telegraphy - Audio oscillator - Automatic control - Automatic excitation control - () Automatic control equipment - Automatic fieid damper (killer, suppressor) - () Automatic frequency control - () Automatic load-frequency control - () Automatic load-shedding control equipment - Automatic load transfer - () Automatic loss-of-synchronism control equipment - Automatic loss-of-voltage tripping equipment -

Automatic program control - Automatic reclosing - () Automatic reclosing control equipment - Automatic regulation - Automatic remote tripping - Automatic reset - Automatic sequence control - Automatic switch (low voltage) - ( ) Automatic switching control equipment - Automatic synchronous coupler - Automatic to reserve source - () Automatic transfer switch - ( ) Automatic voltage control - () Automatic voltage regulator - Automation - Auto-recloser - uto-reclosing - Autotransformer - Auxiliaries (unit, station) transformer - (, ) Auxiliary circuit - Auxiliary generator - Auxiliary instrument transformer - Auxiliary relay - Auxiliary services supply - Auxiliary supplies - Auxiliary transformer of a unit {of a power station) - () Availability - Availability factor - Availability rate - Available capacity - Available power - B Back ampere-turns Back electromotive force - Back up protection - () Bad contact - Balanced bridge - Balance relay - Balancing battery - Balancing network - Band - Band of regulation - Band-pass filter - Band-rejection - Band switch - Band width - Bank of accumulators - Bank of capacitors - Basic current - Bay -

Bay (of a substation) - Beat - Beat frequency - Biased differential relay - Biased relay - Bias electrical restraint - Bias voltage - Bidirectional pulses - Bifilar winding - Bimetallic plate - Bipolar - Bit - Block - Block-diagram - - Blocking circuit breaker closing - Blocking diode - Blocking overreach distance protection system - Blocking protection system - Blocking relay - Blocking signal - Blocking time - Blocking zone - Blowing - Blowout coil - Bobbin - Booster, Booster transformer - Branch box Branch line (spur) - Brake magnet - Break - rk-before-make contact - Breaker fail (failure) protection - Breaking capacity - () Bridge - Bridge balance - Bridge rectifier - Bridging - Buchholz relay - Buchholz surge - , Bucking - Buffer storage Buffer store - Bundle conductors - Bundle conductors line - Burn-out - Busbar protection Busbars Busbar section - Busbar section disconnector - Busbar sectionalising switch - Bus coupler circuit breaker Bushing of a transformer -

Bus section breaker - Bypass - Bypass a circuit breaker - Bypass switch - Byte - Cable conductor - Cable duct (in a substation) - Cable rack - Cable tunnel - Calibrated scale - Calibration curve - Calibration report - Calorimetric test - Capacitance between a conductor and earth - Capacitance between conductors - ( ) Capacitive current - Capacitive feedback - Capacitive load - Capacitive potential divider - Capacitive reactance - Capacitive residual current - Capacitive susceptance - Capacitor - Capacitor discharge - Capacitor tripping device - Capacitor voltage supply unit - Capacitor voltage transformer - Capacity of a battery - Carrier channels - Carrier current - Carrier current protection - Carrier frequency - Carrier frequency transmission - Carrier frequency transmission over high voltage tines - Case - Cathode ray tube - - Causes - Central processor unit - Central store - Centre zero relay - Centre-zero scale - Certificate of calibration - Change of measuring range - Change of state - Change-over switch - Characteristic equation - Charge (of capacitors or batteries) - ( ) Charger - Chart - Chart recorder - Check -

Checking instrument - Choice of setting - Choke - Choke coil - Circle diagram - Circuit - Circuit breaker - Circuit breaker closing - Circuit-breaker failure protection system - Circuit breaker openinig - Circuit breaker position data - Circuit characteristics - Circuit closed in standby position - Circuit closed in working position - Circuit in service Circuit on standby Circuit-opening contact - Circular impedance characteristic Circulating current system - Clear the short-circuit Clipper - Clock pulse Close (to)(manually) - () Closed-loop control - Close-up faults - Closing (manual) - () Closing contact - Closing electromagnet Closing instruction (manual) - () Closing mechanism - Closing operation - Closing time - Coarse adjustment - Coarse reading - Coarse setting - Coarse synchronizing - Coaxial cable - Coding - Coil - Collapse of frequency - Collapse of voltage - Combined instrument transformer Combined heat and power Coming into step - Commercial test - Common auxiliaries Common battery Communication cable - Comparison circuit - Compensating voltage Compensating winding - Compensated network - Compensating feedback Compiler (program) - , Complementary error Complex impedance Complex plane - Complex power -

Components - Computer program Condensing set - Conductance - Conductive coupling Conductivity - Conductor - Conductor failure - Connection diagram - onnection layout - onnections - Connector Constant resistance Contact - Contact chatter - Contact closed in working position - , Contact element - Contact gap - Contact heating - Contact in inert gas - () Contactless pickup - Contact open in working position - Contactor - Contact resistance Contact voltage - Continuous action Continuous control Continuous curve characteristic - Continuous output - Continuous rating - Continuous store - Control - Control action - Control area - Control board (desk) - () Control cable - ( ) Control circuit - () Control current - Control deviation - Control discrepancy switch - Control engineer - Control equipment - Control instruction - Control knob - Controllability - Controlled member - Controlled output - Controlled value - Controller - () Controlling power range - Control of network - Control order - Control panel -

Control process - Control pulse - Control range - Control switch - Control unit - Control voltage - Control winding - Conventional thermal power station - Converter - Converter substation - Conversion of electricity - Copper loss - Core of a transformer - () Corona effect - Corona loss - Correction - Corrective action - Correct operation of a relay protection - Corrupted data - Counting device (of operations) - () Couple (to) - () Coupling between different phases of two circuits of a high voltage link - Coupling between phases - Coupling capacitor - Coupling circuit breaker Coupling filter - Cover of the relay - Current balance - Current balance relay Current carrying capacity - Current circuit Current-dependent - Current limiter - Current limiting reactor Current protection - Current relay - Current resonance - Current reversal - Current rush - Current transformer - Cutoff relay - Cycle - D Damage - Damped oscillations - Damped transient - Damper winding - Damping - Damping circuit - Damping magnet - Damping decrement -

Damping ratio - Dashpot - Data processing - Data transmission - DC/DC Converter power supply - Dead band - Dead earth - Dead-end feeder - Dead short-circuit - Dead time - Dead zone of a directional relay - Deceleration - () Decoupling - Decoupling filter - Dedicated low-voltage wiring - Dedicated optical fibre link - Deenergized line - De-exciting device - Deflection - Deionization - Deionization time - Delayed auto-reclose - Delay link - Delay relay - Delta connection - Delta-star connection - - Dependent time relay - Dephased - Deviation from synchronous time - Differential connection - Differential controller - Differential protection - Differential protection system (longitudinal) - Differential relay - Digital-analogue converter - - Direct access - Direct-axis subtransient reactance Direct-axis transient impedance - Direct current - Direct-current amplifier - Direct-current circuit - Direct current component of a short circuit current - Direct-current relay - Direct current system d.c. system - Direct feedback - Direct input - Direct intertripping - Directional comparision protection system - Directional control Directional current protection - Directional earth relay - Directional neutral current relay - Directional operation - Directional overcurrent relay -

Directional power relay - Directional protection by signal comparison - Directional relay - Direct overcurrent release - Direct reading Direct voltage - Disconnectable busbar - , Disconnection (of a generating unit) - Discrepancy switch Discriminative protection Dispatch control Displacement voltage of the neutral points voltage - Display - , Distance protection - Distance protection system - Distance relay Distance tuning - Distorted waveform - Distortion - Distortion factor - Distributed capacitance - Distributing board - Distributing point - Distribution of electricity - Distribution substation - Disturbance - , Divergent oscillation - Division - Domain - Double busbar system - Double-channel - Double-circuit line - Double-delta connection - - Double earth fault - Double-humped resonance - Double-line-to-neutral fault - Double-phase fault - Double-phase short circuit - Double-throw contact - Double-wired conductor - Double-wound transformer Draw-out unit - Drive - Dry rectifier - Duplicate supply - Duplex channel - Dynamic braking Dynamic response Dynamic stability Earth - Earth connection - Earth current - Earth detector - Earthed neutral - Earth fault -

Earth fault current - () Earth fault protection - () Earth indication relay - Earthing reactor - Earthing resistance - Earthing resistor - Earthing switch - Earthing terminal - Earth leakage current - Earth magnetism - Earth resistance - Earth-wire () Eddy currents - Effective measuring range - Effective range - Effective value - () Efficiency - Electric line - Electrical angle - Electrical circuit - Electrical equipment - Electrical measurement - Electrical power system Electrical power network - Electrodynamic relay - Electromagnetic relay - Electronic relay - Elliptical impedance characteristic - Emergency - Emergency button - Emergency conditions - Emergency control schemes - Emergency crew - - Emergency power supply - End , () End winding - Energise (a relay) - () , Energise - Energise accidentally - () Energised facility - Environmental withstand - Equivalent impedance - Erase - Error correction - Error detection - Even harmonic - Evenly divided scale - Exact-reading scale - Exchange power control - Excitation response - Exciter - Exciting current - Expanded scale - Exponential curve -

Extension cord - External characteristic - External disturbance - External feedback - External short circuit - External terminal - Extra high voltage network - Extremely sensitive F Factory tests - Failure - Failure rate - Failure to operate (of protection equipment)- ( ) Falling out of step - False operation (tripping) - False switching - Fast automatic reclosing - Fault - Fault between laminations - Fault between turns Fault between windings Fault clearance - Fault clearing, short circuit clearing Fault clearance time - Fault current - Fault detector Faulted circuit impedance Fault impedance Fault rate - Fault resistance - Fault signaling - Faults in rotor winding - Faults recorder - Fault situation - Fault statistics - Fault throwing switch - Feedback - Feedback amplifier - Feedback control - Feedback ratio - Feeder Feeder bay Feeder circuit-breaker Feeder disconnector Feeding transformer Ferrit core - () Ferroresonance - Ferroresonance voltage regulator Fiber optics - Fidelity Field suppression - Field circuit

Field winding , Figure of merite - Fine reading - Fine setting - First harmonic - Five-legged transformer Fixed contact - Fixed setpoint control - Fixed value control - Flash-overcurrent - Fleeting indication - Flexible cable - Flip-flop - Floating point - Float switch - Flow diagram - Flush mounting - Foam fire extinguisher - Follow-up control - Follow-up system - Forced control - Forced outage - Frame fault - Frame leakage protection system Frame protection - Free oscillation - Frequency band - Frequency changer Frequency control - Frequency converter Frequency converter substation - , Frequency division - Frequency drift - Frequency interval between channels - Frequency meter - Frequency modulation - Frequency multiplication - Frequency reduction - Frequency relay - Frequency response - Functional block - Fundamental error of measurement - Fundamental wave - Fuse link - G Gain Gain-bandwidth product Galloping of conductor Galvanometer - Gang(ed) control Gapless

Gas insulated metal-enclosed substation Gas-pressure cable - Gas turbine - Gas turbine set Gate - General operating test - Generator operation - Generator protection General-purpose instrument Generating capacity - Generating set Generating unit - Generation - Generation of electricity Generation system Generator - Generator protection Generator-transformer - Generator-transformer protection - Geothermal power station Governing equipment Grading margin Group drive H Half-cycle - Half-wave - Half-wave rectifier - Hall-effect - Harmonic - Harmonic component - Harmonic content - Harmonic function - Harmonic oscillation - Heavy conditions () HF power line carrier blocking - High-frequency cable - High-frequency generator - High frequency disturbance test Higher harmonic Higher harmonic voltage High impedance differential protection - , High set - High-speed automatic reclosing - High-speed automatic reclosing device High-speed excitation system - High voltage High-voltage d.c. link HVDC link () High-voltage installation High-voltage network - High-voltage side - High-voltage switchgear () High-voltage winding -

Holding winding - Hunting - ( ), ( ) Hydroelectric set - Hydroelectric power station - Hysteresis - Hysteresis loop Hysteresis losses I Ideal rectifier - Ideal synchronizing - Idle Idling - Idling conditions - Immobilization Impedance earthed (neutral) system - Impedance protection - Impedance relay Impedance voltage (of a transformer) - () Impulse counter - Impulse voltage test - Inadvertent operation Incorrect operation of relay protection - Independent time relay - Indicating relay - Indicator lamp - Indicator of sense of rotation - Indoor apparatus - Indoor substation - Indoor switch-gear Induced voltage - Inductance - Induction relay - Industrial interference - Inertia constant - Inherent feedback - Initial commissioning test - Initial symmetrical (sub transient) short circuit - ( ) Injection type relay - Inoperative direction - Input winding - Insensitivity of control ( ) In service Inspection - Instability - Instantaneous element - Instantaneous relay - ( ) Instantaneous value - Instruction - Instructions for mounting and maintenance of relays - Instrument - Insulation resistance - Insulation test voltage - Integral action

Integral control Integral controller - Integrated circuit - Integrator - Interconnected systems Interconnection - Interference - Interference effect - Interference filter Interference frequency - () Interference immunity against electrostatic discharge (ESD) - Interference immunity against ast transient signal (burst) - Interference pulse - Interlock - Interlocking signal - Intermittent contact - Intermittent earth Intermittent fault Internal combustion set - Internal short circuit Intertripping - Iterruption arc Interruption of supply Interturn fault - Inverse characteristic relay - Inverse time, Very inverse time, Extremely inverse time current relay , , Ionization - Iron losses Iron-nickel accumulator Islanding Isolated network operation Isolated neutral system Isolated operation Isolated system Isolating transformer - () Isolation transformer - Issuing of permit to work - In-rush, Inrush J Jack - Jumper - Jumper board K Kiosk substation - Knob - Knob with indicator

L Lagging current - Latch(ing) relay, Latch-in relay - Lightning discharge Line - Linear scale - Linear system - Line attenuation - Line charging current - Line-drop compensation - Line fault Line impedance angle - Line protection Line reactor - Line trap - Line voltage Live circuit breaker - Live line - Load in a system - Load curve - Load duration curve Loading resistor Local back-up (circuit and substation) - ( ) Local control - Logical multiplication Logic scheme Longitudinal differential protection Long power transmission line Loop current Loss Loss of excitation Loss of load - Loss of stability Loss of synchronism Loss of synchronism relay - Loss of voltage - Loss of voltage relay - Lower frequency (to) - Low frequency - Low-frequency amplifier - Low-frequency band - Low-operating - Low set - Low voltage - Low-voltage apparatus - Low-voltage side - M Magnetic circuit Magnetizing current - Magnetizing inrush - Magnetizing inrush restrain -

Magnetoelectric relay Magneto-hydro- dynamic thermal power station (MHD power station) (.) Magnetomotive force - Magnitude of disturbance - Main busbar - Main generator - Main protection Mains voltage - Maintenance ( ) Maintenance tests Maintenance work - Make and break - Make-break time - Make time - Making capacity - Maloperation - Manned substation - c Manual closing - Manual opening - Manual regulation - Master controller - Master substation - Matching transformer Maximum asymmetric short circuit current - Maximum voltage relay - Mean deviation - Mean square error Mean time between failure - Mean value (of a periodic quantity) - ( ) Measuring relay - Measuring winding - Mechanical durability Medium-voltage - Medium-voltage winding - Megger - Men on duty - Mercury contact - Mesh (of a system) Meshed system - - Mesh-current method - Meshed network - Metalclad cable - Metal-clad installation Metering winding - MHO-type distance relay Microwave pilot protection system - Midposition Mimic diagram (wall diagram) - Mismatch - Mounting - Movable contact Moving coil Moving coil relay Moving part

Motor protection Multi-ended line () Multilayer mounting Multiple earth fault - Multiple shot reclosing () Multiposition relay Multisection coil - Multishot reclosing Multi-terminal line Multiwinding transformer - N Negative bias - Negative sequence component - Negative sequence impedance - Network with directly earthed neutral - Network with isolated neutral - Neutral current - Neutral point - Neutral point connection - Neutral point displacement voltage - Neutral point in a polyphase system - Noisefree Noise immunity - Noise level - Noise limitation - No-load current - No-load operation - No-load power - No-load test - No-load voltage - Nominal current - Nominal transformation ratio - Nominal value - Nominal voltage - Nominal voltage of a system - Non-attended substation - Non-availability - Non-availability factor Non-linear distortion - Non-linearity - Non-linear resistor - Non-sinusoidal current - Non-successful reclosing - Normally closed break contact - Normal operating condition - Nuclear (thermal) power station Number of auto-reclose - Numerical relay - O Occur , ( )

On-load tap-changer Open Open-delta connection - Opening - Opening mechanism - Opening time - Open-loop control - Operating characteristic Operating availability - Operating current - Operating impedance - ( ) Operating lag (of a relay) - Operating range - Operating rules - Operating time of protection Operating times accuracy - Operating voltage (in a system) - Operating winding - Operative current - Operative direction - Optical fibre cable - - Optical link pilot protection system - Optocupler - , Oscillations - Oscillogram - Oscillograph - Outage , Outdoor apparatus - Outdoor substation Outdoor switch-gear - Outgoing (incoming) feeder - () Out-of-operation - Out-of-order - Out of service Out-of-step protection - Out-of-tune - Output circuit Output current Output relays module - Output stage - Output terminal - Output value Output winding Over protection Overcurrent protection Overcurrent relay Overcurrent time-lag relay Over-excitation - Overfluxing in power transformers - Overhaul - Overhead line - Overhead system - Overheating Overload -

Overload operation - Overload protection - Overload protection system - Overload relay - Overall fault clearance time - Overreaching (for a distance protection system) - ( ) Overshoot - Overspeed protection device - Overvoltage Overvoltage protection P Packet switch Pairing - Pair twisting - Parallel access - Parallel connection - Paralleling - Parallel operation - Passing contact - Peak load - Percentage-differential relay - , - Percentage differential protection - Percentage relay - Periodic component - Permanent fault - Permissible error - Permissive intertripping - Permissive overreach distance protection system - Permissive protection system - Permissive underreach distance protection system - Petersen coil - Phase - Phase coincidence - Phase comparator relay - Phase comparison protection system Phase current - Phase displacement - Phase-earth coupling Phase lag - Phase opposition - Phase segregated differential current position - Phase sequence - Phase sequence indicator - Phase sequence reversal - Phase-sequence test - Phase-shifting network - Phase to earht voltage (line to ground voltage)

Phase-to-groundl fault - , Phase to phase voltage (line to line voltage) Phase to neural voltage (line to neural voltage) - Phase unbalance protection - Phase voltage of a winding - Pick-up, Pickup Pl equivalent - -pilot ( , ) Pilot protection system - Plant motor - Plug-and-jack Plug-and-socket connection - Plug-in unit Pneumatically operated switch ( ) Pointer , Pointer stop Point of connection - Point-to-point-wiring - Polarity - Polarity indicator - Polarity reversal - Polarity test - Polarized relay - Pole (of an equipment) - () Pole (of a d.c. system) - ( ) Pole-mounted substation - Portable instrument - Portable test equipment - Position indicator - Positive feedback - Positive sequence Positive sequence component - Positive sequence impedance - Positive voltage - Post-emergency conditions - Post-fault conditions - Potential - Potential difference - Power - Power charge controller - Power factor - (cos) Power frequency - Power-frequency characteristic - - Power-frequency control - Power input Power limitation Power line carrier protection system - Power output Power relay Power station - Power supply module - Power system separation - Power swing blocking -

Power unit - Prearcing time - Protection against - - Press-button switch - Pressure monitoring device - Pressure transducer - Primary - Primary circuit - Primary control - Primary testing - Primary winding - Program of routine maintenance - Protected line - Protected zone - Protection Protection against short circuits Protection assembly Protection by phase comparison - , Protection device Protection relay Protection system Protection system associated with signaling system - , Protection winding Protection with stage (step) acceleration - , Pulsating current - Pulsating voltage Pulse edge - Pulse-relay - Pulse train Pumped storage power plant - Pumped storage station - Pump-storage generating set Pump-turbine - Push-button control group Q Quadrature-axis subtransient reactance Quadruple conductor (4 ) Quenched spark R Radial network - Radiated electromagnetic field test Radio link protection Random synchronizing - Range of adjustment Range of regulation Range of scale - Rate of change of... relay - ... Rated capacity

Rated current of a contact - Rated thermal current Rate of pulse rise - Reactance Reactance relay Reactive energy - Real time - Receiver - Receiving channel - Receiving level - Recovery time - Recovery voltage - Rectification - Rectifier - Reduced measuring error - Reduced voltage - Reed relay - Reference instrument - Reference value - Reference voltage - Reflected wave - Register - Regulating point - Regulation - Regulation level - Regulator performance - Relative error - Relatively selective protection system non-unit protection system - Relay - Relay box - Relay cabinet - Relay characteristic angle - Relay coil - Relay cubicle - Relay element Relay protection Relay set Relay winding Release - Release lag - Reliability - Reliability index - Remote backup protection Remote control - Remote indication - Remote setting Remote supervision - Remotely controlled substation - Repair - Reserve busbar - Reset - Reset push-button - Reset time -

Resetting value - Residual capacitive voltage - Residual current - Residual magnetization - Residual voltage - Resistance - Resistivity - Resonance - Resonant earthed (neutral) system arc-suppression-coil-earth (neutral system) - Response level - Response time Restore - Restraining coil - Restricted earth fault protection of transformer - , Retardation time Returning percentage - Returning value - Return to initial position - () Reversible hydroelectric set - Rigid wiring Ring connection - Ring feeder (loop) Ring mains - Ring network - Ring operation - Ring substation - Rise in frequency - Risk of failure - Root-mean-square deviation - Root-mean-square value - Rotor earth fault protection - Rotor fault to frame - Rotor winding - Rough reading scale - Round-the-clock service - Running-down S Sample - Sampling cycle Satellite substation - oo Saturable reactor - Saturable transformer - Saturation - Saturation area - Saturation region - Scale - Schematic diagram - Screening - Screw connection

Secondary - Secondary circuit - Secondary control - Secondary leads - Secondary relay - Secondary testing - Secondary voltage - Secondary winding - Selective protection Selective time interval - Selective tripping plan - Selectivity - Selector switch disconnector - Self-adjusting control - Self-contained supply - Self-control - Self excitation - Self-extinguishing fault - ( . ) Self-holding contact - Self inductance - Self-locking contact - Selfmonitoring - Self-oscillation - Self-regulation - Selfsupervision - Self-synchronization - Self-synchronizing - Semiautomatic system - Semiconductor - Semigraphical method - Senior shift engineer - Sensitive Sensitive protection - Sensitivity - Sensitivity of a directional element - Separated windings - Separate network - Sequence control - Serial access - Serial communication - Series capacity - Series compensation - Series connection - Setting - Setting current Setting knob Setting up of actual value Setting value Shield - Shielding case Shift engineer Shock current Shop instructions

Short circuit - Short circuit and earth Short-circuit between phases - Short-circuit characteristic Short-circuit current Short-circuit current calculations - Short-circuit earth current - Short-circuit protection Short-circuit power - Short-circuit through an arc Short-circuit to earth - Shunting - Signal level - Signal-to-noise ratio - - Signal transmission time - Silent arc - Simplex channel - Simulation test - Simulator - Single-acting autoreclosing - Single-busbar substation - Single-channel - Single-circuit line - Single conductor - Single-element relay - Single feeder (radial feeder) - Single-line diagram - Single phase automatic reclosing control equipment - Single-phase autoreclosing - Single-phase short circuit - Single-phase transformer - Single pole automatic reclosing control equipment - Single-pole switch - Single shot reclosing - Single supply - Single-three-phase rectosing - (-) Single-turn current transformer - Slave-relay - - Slip - Slip frequency - Slow-operating relay Slow-release relay - Slugged - Smooth variation - Software - Solar battery - Soldered connection - Soldering - Solid-state relay - Solid-state switch - Solidly-earthed neutral - Spare parts - Spark capacitor -

Spark-quenching circuit - Specified value - Speeder motor - Speed governor - Speed regulator Speed-up - Speed-voltage generator Split-phase Split secondary - Split the busbars - Spring contact - Spur line Spurious capacitance - Spurious opening - Spurious tripping - Stability - Stable - Stable conditions - Stable oscillation - Stage change point - Stage circuit - Stage length - Stand by set - Stand-by supply - Star-delta switch - Star-star connection - - Starting relay - Starting situation - Starting tests - Start of parallel operation - Start operation (of a relay) - () Start-stop control - Static compensator Static convertor Static error - Static excitation Station auxiliaries voltage Station under AGC (LFC) - , Stator earth fault protection - Stator fault to frame - Stator winding - Steady-state short-circuit current - Steady-state stability Step action - Step-by-step method - Step-down substation Step-down transformer - Step change point - Step length - Stepless control - Stepped characteristic Step response - Step-up substation - Step-up transformer -

Stray capacitance - Stray currents () Stub line - Subsequent faults Substation Substation relay room - Subtransient reactance Successful reclosing - Sudden change in frequency - Sudden load variation - Superconductivity - Superimposed current - Superposition method - Supervising person - Supervision trip circuit - Supply (a relay) - () Supply interruption - Supply point Supply voltage Supply voltage of auxiliary circuits ( ) Susceptance Sustained fault - Sustained short-circuit current - Sweep - Swing blocking - Swinging of conductors - Switch - Switchable busbar - , Switched busbar circuit-breaker Switch-gear Symmetrical component method - Symmetrical short circuit - Symmetrical voltage Synchronization - Synchronize - Synchronizing relay - Synchronism - Synchronoscope - Synchronous compensator - Synchronous generator - Synchronous motor - Synchronous operation - Synchronous reactance - Systematic error System configuration System control System control centre - System diagram - ( ) System operational diagram - T changing ( ) Tapped line (teed line)

Telecommunication - Telecommunication line - Telemetering - Teleregulation - Temperature-dependant- Terminal - , Terminal voltage - Tertiary winding - Thermal generating set - Thermal limit burden - Thermal power station - Thermal power unit Thermal relay - Thermal replica - Thermocouple - Third harmonic - Three-element relay - Three phase automalic reclosing control equipment Three-phase fault - Three-phase system diagram - Three-phase transformer Three windings transformer Threshold (of) sensitivity - Threshold value Through fault current - () Thyristor - Time characteristic - Time constant - Time delay - Time-dependant - Time differential - Time grading - Time interval Time-lag relay - Time schedule - Time to operate - Timing element - Toggle switch Total break time - Total current - Total loss of load - Traction substation - Transducer - Transductor - Transfer busbar - Transfer function - Transfers bars - Transformation of electricity Transformer bank - Transformer circuit-breaker - Transformer protection - Transformer ratio - Transformer substation - () Transformer tap -

Transformer winding - Transformer with on-load tap chanching - Transformer with off-load tap changing - Transformer with regulation in phase - Transformer with regulation in quadrature - Transforming station - Transient analysis - Transient fault - Transient feedback - Transient performance - Transient phenomenon - Transient reactance - Transient response - Transient short circuit - Transient short circuit current - Transient stability - Transient state - Transistor - Translator (isolating transformer) Transmmission channel - Transmission data rate - Transmission limit Transmission line capability Transmission of electricity Transmitter - Transposition - Transverse differential protection Traveling wave Treed system - () Trip , Trip a circuit breaker ( ) Trip circuit Trip coil Trip command Triple busbar substation Triple conductor Triple-frequency harmonic Triple unit (Motor, Pump, Turbine) (, , ) Tripping relay - Tripping time Trunk line - Trunk main - Tuned circuit - Tuning capacitor - Tuning indicator - Tuning range - Turbine governor - Turbogenerator - Turbo-generator set - Turn - Turn-to-turn short circuit -

Turn-fault () Turn-fault protection Twin conductor - Twisted conductor () Twist joint Two-layer winding - Two-way contact () Two-way feed - Two-stage relay - U Ultra-high voltage Unattended substation Unbalance current - Unbalanced conditions - Unbalanced short circuit - Unblocking () Underdamping - Under-excitation - Underfrequency load shedding - Underfrequency relay - Underground cable - Underground substation - Underground system Under...relay Underreaching (for a distance protection system) - ( ) Unfaulted phase - Unidirectional - Unidirectional current - Unimeter - Uninterrupted operation - Uninterruptible power supply - Unload - Unloaded line - Unmanned - Unmanned substation - Unstable - Untapped - Unwanted operation (of a protection equipment) - ( ) Upper harmonics Urban network - V Varistor - V-connection - Vector group (of a transformer) - Voltage - Voltage balance - Voltage balance relay Voltage bild-up - Voltage circuit -

Voltage deviation - Voltage direction - Voltage divider - Voltage division - Voltage drop - Voltage level - Voltage limiting - Voltage range - Voltage regulator - Voltage relay - Voltage restrained overcurrent relay - Voltage ripple - Voltage rise - Voltage transformer - Voltage transformer error - Voltage trebling - Volt-ampere characteristic () W Wall diagramm Wattage - Watt consumption - Weighting factor - Winding - Winding path - Wire-pilot Wire-wrap connection - Wire wrapping - Wiring {secondary wiring) - Wiring - () Wiring blemish Withdrawal from service - Working zone Wye-delta - Wye-delta connection - Wye-wye - Z Z-connection Zero crossing - Zero drift - Zero error - Zero mark - Zero offset - Zero phase-sequence voltage - Zero sequence component - Zero sequence current - Zero sequence impedance - Zero sequence voltage relay - Zone of protection -