Non-Directional Relay Block 7SR21 with (02)

Features and technical specifications:

1. CT inputs : 4 No’s
2. Binary inputs : 19 No
3. Binary output’s : 16 NO

This Non-Directional Relay Block is easily insert in your schematic diagram and connect as you like way.

Current Inputs :-
Four current inputs are provided in the 7SR21 relay and five inputs are provided in the 7SR22 relay. Current inputs are located on the Analogue Input module. Terminals are available for both 1 A and 5 A inputs. Current is sampled at 1600 Hz for both 50 Hz and 60 Hz system frequencies. Protection and monitoring functions of the relay use either the Fundamental Frequency RMS or the True RMS value of current appropriate to the individual function. The waveform recorder samples and displays current input waveforms at 1600 Hz. NB: The Relay has a flat frequency response measuring harmonic currents up to and including the 50th Harmonic but does not measure the content at the aliasing frequencies i.e. 800 Hz (16th harmonic) + 1600 Hz (32nd harmonic) + 2400 Hz (48th harmonic)

Voltage Inputs :-
Four voltage inputs are provided in the 7SR22 relay. Voltage inputs are located on the Analogue Input module. Voltage is sampled at 1600 Hz for both 50 Hz and 60 Hz system frequencies. Protection and monitoring functions of the relay use fundamental frequency voltage measurement. The waveform recorder samples and displays voltage input waveforms at 1600 Hz.

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