PCS-221S Merging Unit

PCS-221S Merging Unit (MU) is used to receive AC analog values and transmit the Sampled Values (SVs) to protection devices, Bay Control Units (BCUs) or electricity meters through optical communication channels based on the IEC 61850-9-2 protocol and IEC61869-9 protocol. PCS-221S provides 2 methods to receive AC analog values: to sample AC analog values directly as a Stand-Alone Merging Unit (SAMU), or to receive digital sampling data from Low-Power Instrument Transformer (LPIT) via optical fiber. LPIT is also known as NCIT (Non-Conventional Instrument Transformer) or ECVT (Electronic Current & Voltage Transformer). 

The PCS-221S can also be used to control primary switching equipment, i.e.: Circuit Breaker (CB), Disconnector Switch (DS), Earthing Switch (ES) in digital substations of all voltage levels. It supports real-time GOOSE communication, and can realize tripping and closing of CB/DS/ES via protection devices and BCUs. It can acquire binary input signals of primary equipment (CB/DS/ES) at the same time. It can meet the requirements of GOOSE tripping by point-to-point mode or network mode.