7SR157

  • Synchronism Check (25)
  • Compact Numerical relay
  • Integrated programmable logic




The 7SR157 Argus is a combined check and system synchronising relay which can carry out controlled closing of a circuit breaker using measurements of the line and bus voltages. The relay will prevent closure of the circuit breaker if the differences in phase angle, slip frequency or magnitude of the voltages fall outside prescribed limits.