This walkthrough will assist you in setting and commissioning these relays for the various types of available fault protections using the SFT2841 utility.
Steps to Commission a Sepam S20 Relay
The tutorial that follows below elaborates on each of these steps in every detail.
Which Fault Protections Are Available in the S20 Relay?
Entering the Initial Configuration
For the initial configuration, you will need to specify the following parameters.
Programming the Control Matrix for Sepam S20
The control matrix controls the activation of logic outputs and display LEDs in response to specific fault functions and input signals. A typical configuration is shown below, which activates respective LEDs in response to each of the fault triggers.
Setting for 50/51 Phase Overcurrent Fault
The 50/51 phase over-current fault requires the parameters listed in the table below to be entered into the SFT2841 utility. The parameters entered above, for both the phase over-current and short-circuit faults, will result in the TCC plot given below when the instantaneous and inverse-definite curves are integrated.
Setting for 50/51 - 2 Phase Short-Circuit Fault
The 50/51 phase short-circuit fault requires the parameters listed in the table below to be entered into the SFT2841 utility.
Setting for 50N / 51N - 1 Earth Fault
The 50N/51N earth fault requires the parameters listed in the table below to be entered into the SFT2841 utility. The parameters entered above, for both the earth and earth short-circuit faults, will result in the TCC plot given below where the instantaneous and inverse-definite curves are not integrated.
Setting for 50N / 51N - 2 Earth Short-Circuit Fault
The 50N/51N earth short-circuit fault requires the parameters listed in the table below to be entered into the SFT2841 utility.
Setting for 46 - Negative Sequence Fault
The 46 negative sequence fault requires the parameters listed in the table below to be entered into the SFT2841 utility. This content is accurate and true to the best of the author’s knowledge and is not meant to substitute for formal and individualized advice from a qualified professional. © 2020 StormsHalted
