| ACT |
1. Application Configuration tool in PCM600 2. Trip status in IEC 61850 |
| CAT 5 | A twisted pair cable type designed for high signal integrity |
| CBB | Cycle building block |
| COMTRADE | Common format for transient data exchange for power systems. Defined by the IEEE Standard. |
| CT | Current transformer |
| DFT | Discrete Fourier transform |
| DT | Definite time |
| EMC | Electromagnetic compatibility |
| Ethernet | A standard for connecting a family of frame-based computer networking technologies into a LAN |
| FIFO | First in, first out |
| FTP | File transfer protocol |
| FTPS | FTP Secure |
| GOOSE | Generic Object-Oriented Substation Event |
| HMI | Human-machine interface |
| IDMT | Inverse definite minimum time |
| IEC | International Electrotechnical Commission |
| IEC 61850 | International standard for substation communication and modeling |
| IEC 61850-8-1 | A communication protocol based on the IEC 61850 standard series |
| IED | Intelligent electronic device |
| IEEE 1686 | Standard for Substation Intelligent Electronic Devices' (IEDs') Cyber Security Capabilities |
| IRF |
1. Internal fault 2. Internal relay fault |
| LCD | Liquid crystal display |
| LED | Light-emitting diode |
| LHMI | Local human machine interface |
| MCB | Miniature circuit breaker |
| Modbus | A serial communication protocol developed by the Modicon company in 1979. Originally used for communication in PLCs and RTU devices. |
| MV | Medium voltage |
| NC | Normally closed |
| PCM600 | Protection and Control IED Manager |
| Peak-to-peak |
1. The amplitude of a waveform between its maximum positive value and its maximum negative value 2. A measurement principle where the measurement quantity is made by calculating the average from the positive and negative peak values without including the DC component. The peak-to-peak mode allows considerable CT saturation without impairing the performance of the operation. |
| Peak-to-peak with peak backup | A measurement principle similar to the peak-to-peak mode but with the function starting on two conditions: the peak-to-peak value is above the set start current or the peak value is above two times the set start value |
| PSU | Power supply unit |
| RCA | Also known as MTA or base angle. Characteristic angle. |
| RJ-45 | Galvanic connector type |
| RMS | Root-mean-square (value) |
| RS-485 | Serial link according to EIA standard RS485 |
| RTC | Real-time clock |
| SBO | Select-before-operate |
| SCADA | Supervision, control and data acquisition |
| SI | Sensor input |
| SMT | Signal Matrix tool in PCM600 |
| SNTP | Simple Network Time Protocol |
| SO | Signal output |
| SOTF | Switch onto fault |
| STP | Shielded twisted-pair |
| TCP | Transmission Control Protocol |
| TCS | Trip-circuit supervision |
| UART | Universal asynchronous receiver-transmitter |
| USB | Universal serial bus |
| UTC | Coordinated universal time |
| VT | Voltage transformer |