Differential Relay modelling using MATLAB Simulation procedure

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Simulink :

Simulink is a block diagram environment for multidomain simulation and Model-Based Design. It supports simulation, automatic code generation, and continuous test and verification of embedded systems. Simulink provides a graphical editor, customizable block libraries, and solvers for modeling and simulating dynamic systems. It is integrated with MATLAB®, enabling you to incorporate MATLAB algorithms into models and export simulation results to MATLAB for further analysis

Differential Relay

Principle of Differential Protection scheme is one simple conceptual technique. The differential relay actually compares between primary current and secondary current of power transformer, if any unbalance found in between primary and secondary currents the relay will actuate and inter trip both the primary and secondary circuit breaker of the transformer.
Suppose you have one transformer which has primary rated current Ip and secondary current Is. If you install CT of ratio Ip/1A at primary side and similarly, CT of ratio Is/1A at secondary side of the transformer. The secondaries of these both CTs are connected together in such a manner that secondary currents of both CTs will oppose each other. In other words, the secondaries of both CTs should be connected to same current coil of differential relay in such a opposite manner that there will be no resultant current in that coil in normal working condition of the transformer. But if any major fault occurs inside the transformer due to which the normal ratio of the transformer disturbed then the secondary current of both transformer will not remain the same and one resultant current will flow through the current coil of the differential relay, which will actuate the relay and inter trip both 

Differential Relay and Simulink modeling:
SimuLink Model Design
Procedure:

  • 1.    First start the MathLAB software and then type ”simulink” on code editor.
  • 2.    Then create a new model project from the simulink library browser menu.
  • 3.    Then go to simscape → simpowersystems → specialized technology → electrical sources → Three phase source. Add three phase source to model window.
  • 4.    Then go to simscape → simpowersystems → specialized technology → elements → Three phase breaker. Add 2pcs of three phase breaker,Three phase RLC load and 3pcs of Three phase fault.
  • 5.    After that go to simscape → simpowersystems → specialized technology → measurement→ Three phase V-I measurement. Add 2pcs three phase V-I measurement unit.
  • 6.    After that go to simulink→ sink → scope. Add 4 scope functions.
  • 7.    After that go to simulink→ signal routing →demux. Add 4 demux functions.
  • 8.    After that add powergui.
  • 9.    Then go to simscape → elements →Three phase transformer (Two Windings). Add a Three phase transformer.
Series connected Zone diagram modeling 

Power system Protection Details// power-system-protection-for-power-plant.html

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