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  • GE VERNOVA | HIGH IMPEDANCE BUS DIFFERENTIAL RELAY | MCAG

GE VERNOVA | HIGH IMPEDANCE BUS DIFFERENTIAL RELAY | MCAG

Electrical PowerElectrical Protection & Control Busbar
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GE VERNOVA | HIGH IMPEDANCE BUS DIFFERENTIAL RELAY | MCAG

MCAG relays provide high-speed differential protection for various types of power system plants Including generators, reactors, busbars, motors and the individual windings of power transformers. The relays provide current-calibrated busbar differential and have an attracted armature design with simple and robust construction.

Application

When circulating current protection schemes are subjected to heavy through faults, the sudden and often asymmetrical growth in the system current can cause the protective current transformers to approach or even reach saturation level. This may result in a high unbalancing current due to the variations in the magnetizing characteristics of the current transformers. To ensure stability under these conditions, it is common practice to use a high impedance relay, set to operate at a voltage slightly higher than that developed by the current transformers under maximum external fault conditions.

Key Benefits

  • High stability during through faults Operation is fast and reliable (25ms at 5 x setting)
  • Easy integration into 4U height MIDOS rack schemes
  • Highly-tuned to the fundamental to prevent spurious operation

Key Features

  • High thermal withstand - improved when used with the stabilising resistor
  • Long service history, over 43,000 delivered since 1984
  • Design pedigree coming from over a million auxiliary relays in-service

Protection & Control

  • Differential and restricted earth fault protection for busbars, generators, reactors, motors, autotransformers and transformer windings
  • Stability during through faults with fast operation (25ms at 5 x setting)
  • Relay circuit tuned to supply frequency, ensuring reliable protection under CT saturation conditions

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