Digital guide

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GE 437X725L11

  • Product Name:​ Overcurrent / Feeder Protection Relay
  • Product Overview:​ A digital relay designed to protect medium-voltage distribution feeders and transmission lines against faults and abnormal operating conditions.

Detailed content

  • Protection Elements:​ Incorporates three-stage overcurrent (instantaneous, short-time, inverse-time), directional ground fault, differential, and distance protection schemes.
  • Performance Parameters:​ Instantaneous overcurrent tripping time ≤ 30 milliseconds; high-speed differential protection for zone-selective interlocking.
  • Event Recording:​ Captures 256 time-stamped disturbance events; oscillography function records 4 pre-fault and 8 post-fault power system cycles for detailed analysis.
  • Application Scenarios:​ Widely deployed in industrial substations, utility distribution networks, and renewable energy interconnection points.
  • Installation Requirements:​ Proper current transformer (CT) and potential transformer (PT) ratios must be programmed during commissioning; ensure adequate panel ventilation.

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