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Relay Settings in the "Overcurrent" Room – Part 2

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After defining a “Stage” for the relay’s trip characteristic curve, you can set the current and time limits

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for the curve in the “Active Range Limits” section. To do this, first check the “Active Range Limit” box

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to activate the section. Then, enter the desired values in the relevant fields. For example, if you set “tmin”

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” to 1 second and “tmax” to 30 seconds, you’ll notice that the characteristic curve is now limited within this time range.

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In the current range section, you might enter “Imin” as 1.2 times “Iref”,

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and “Imax” as 100 times “Iref”. On the right-hand side of the window, you’ll see that the relay’s characteristic curve is now defined between 1.2 and 100 times the reference current,

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which is “Iref”, or the secondary rated current of the CT.

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Additionally, for relays that operate in “Definite Time” mode beyond a certain current level,

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you can use the “Limit t from I” option. For example,

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, if you have a relay that starts operating from 1.1 times the defined “Pickup” current,

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and switches to “Definite Time” mode from 20 times the “Pickup” current, you should enter “1.1”

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” in the “I min” field, and 20 in the “Limit t from I” field.

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Keep in mind that the “Range Limits” settings can also be adjusted from the “Manage / Select Characteristic” page.

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If the relay’s characteristic curve consists of multiple “Stages”,

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you’ll need to define the required number of stages using the “Add” button.

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. Then, by configuring the parameters for each one, you can proceed with testing the relay

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For instance, here we create another stage of the “Definite Time” type.

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We set its pickup current to 1.5 times I ref, and its operating time to 200 milliseconds in the “Time” column

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As you click on each stage, its corresponding characteristic curve is displayed in the right-hand window.

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Then, under the “View Resulting Characteristic” tab, you can see the final characteristic curve generated by combining all the defined stages in the table

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In the Color column, each stage is assigned a specific color for visual distinction

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And in the “Active” column, you can enable or disable any defined stage using the “Yes” or “No” options.

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For example, here, the second stage is deactivated by selecting “No”, and it is removed from the resulting characteristic curve.

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Using the “Save as User-defined” option, you can save the characteristic curve created in any “Stage”

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to the “User Defined” folder under the “Manage / Select Characteristic” window for future use.

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For example, here we select the first stage and click on “Save as User-defined”.

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This opens the “Manage / Select Characteristic” window. Then, by clicking “OK”

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and returning to this window, you can see that the curve and its settings have been saved under the name

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“IEC Normal Inverse2” in the “User Defined” folder.