Glossary of Electrical Terms in English — O
O
It happens — it happens, it happens (for any event)
Load switch-load switch
Open - disable
Open -delta connection — open delta connection
Open - disable
Opening mechanism - open mechanism
Opening time — closing time
Open-loop control — open-loop control
Operating characteristic — characteristic of the relay
Operational availability - operational availability
Operating current — operating current
Operating Impedance — Operating Impedance (Impedance)
Operating delay (of a relay) — delay of the relay when actuated
Operating range — operating range
Operational rules - operational rules
Protection uptime — protection response time
Punctuality of working hours
Operating voltage (in system) — operating voltage of the electrical network
Working coil - working coil
Operating current — operating current
Operational direction — direction of action
Optic cable
Optical link pilot protection system
Optocoupler — optical isolation, optocoupler
Vibrations — fluctuations
Oscillogram - oscillogram
Oscillograph - oscilloscope
Interruption - failure, emergency shutdown
Outdoor apparatus — equipment for outdoor installation
External substation — external substation
External switchgear - external switchgear
Outgoing (incoming) feeder — connection of the outgoing (power) line
Out of Service - Inactive
Out of order-defective
Out of service — put out of service
Out-of-step protection - relay protection from asynchronous operation
Moody-upset
Output circuit — output circuit
Output current — output current
Output relay module — block of output relays
Output stage - output stage
Output terminal — output terminal
Output value — output value
Output Coil — Output coil
Over … protection — protection of the maximum principle of action
Overcurrent protection — Overcurrent protection
Overload relay — an overcurrent protection relay
Overcurrent time delay relay - overcurrent protection with time dependent current characteristic
Overexcitement — overexcitement
Overloading in power transformers — overexcitation of power transformers
Overhaul — major overhaul
VL — overhaul
Overhead system — overhead power grid
Overheating — protection against overheating
Overload — overload Operation of overload — overload mode
Overload Protection — Overload protection
Overload Protection System — Overload protection system
Overload relay — turnip overload protection
Total Troubleshoot Time — Total troubleshoot time
Overshoot (for distance protection system) — extended area (for distance protection protection)
Overshoot — overshoot
Overspeed protection device - protection against overclocking of the turbine
Overvoltage — surge
Surge protection — Surge protection