Single command - Arc protection - Bay control and measurement - Motor protection - Transformer protection - 2 winding - Busbar differential protection (low impedance) - Feeder protection - Voltage regulation - Busbar protection (voltage and frequency) - Capacitor bank protection - Interconnection protection - Power management/Load shedding - Back-up protection - IEC 60870-5-101/104 Communication Manual - SSC600 Smart substation control and protection - 1.5 - IEC - ANSI - 16.02.2023

SSC600 and SSC600 SW IEC 60870-5-104 Communication Protocol Manual

Single-command controls are performed towards SPC (controllable single point) IEC 61850 target objects. The command can be given with or without a time stamp (C_SC_NA_1, C_SC_TA_1). Only direct type operations are allowed.

If time-tagged commands are used, it is important to ensure the master and the relay times are synchronized. Also, time zone related settings need to be correct, such as the Time zone (UTC or local) setting and local time offset in general time settings if local time is used. The maximum accepted delay between the command time stamp and the relay time can be adjusted by the Command delay setting.

Many target SPC objects, such as acknowledgement or reset objects, are “transient only” objects. For these objects, only “On” control is relevant. If an “Off” control is performed to them, most often a positive acknowledgement is returned from the target function block, but the object’s action, for example, acknowledgement or reset, is not performed.