Knowledge Base Article #140 - Implementing Ground Impedance and Quadrilateral Test Procedures into a RTS Routine
DateNov 17, 2006
ByENOSERV
Filed UnderRTS
ClassGeneral
 
Issue Addressed
When it comes to Quadrilaterals and Ground Impedance elements, we have to treat each relay manufacturer separately (and sometimes to specific relays with a certain manufacturer), as each relay manufacturer has their own ideas on how entry methods and calculations should be performed.

 
Causes of Issue
This has made it tough to create pre-processed operations as we do with other types of elements. We have to perform two steps to make that happen.

1. Offer the User a entry of setting nomenclature that would appear for that type of relay (performed in the RTS-Defines window)
2. Write the calculations within the RTS.exe specifically for that type of relay.

We have been successful with SEL�s and the GE-UR series relays. I began to work with another customer for the Siemens, but communications were lost between that customer and I was not able to determine the final result of our application. When someone else tried to apply the test sequence, they did not have success, so the process was not applied correctly.

 
Solution to this Issue
This leaves the User with three options.

1. Write a test procedure themselves in �Traditional Code� where the customer uses Basic Command syntax to calculate expected operate values, control how the test procedure is to operate, and perform loops to re-calculate and test at alternate angles. Although this is the method utilized in the past, this is the least desirable method to use.
2. Begin writing a �FasTest� test procedure such as an �Impedance Relay�, but utilize the ability to manually input impedance values expected into the User Options screen. This entry screens can hold variable names, so for ease, calculations for each operate value can be performed by the User in the Pre-Defines screen, set that value to a variable name, then pass the variable name into the User Options screen. This is an effective method and the quickest method to the customer. Although, it does take knowledge from the customer of using Basic Syntax to perform the calculations and knowledge of how to properly apply the steps mentioned.
3. The last option is to work hand-in-hand with ENOSERV to create a pre-processed operation that can be used by anyone with ease. For that to happen, ENOSERV relies on the customer�s expertise with the relay. If we can be given a list of setting names used by that manufacturer for the particular function to be tested (such as the quadrilateral element), the purpose of the settings, then a formula or process to determine how to calculate operate values at particular points (taking into account blinders, load encroachment, etc), we can then apply that into a pre-processed operation within RTS. This is the method we applaud, especially when working with a relay have limited knowledge about, such as the Siemens.

With the request of Step 3, this is something a customer would have to perform if the element was to be tested manually. We are not asking for any additional requirements from the customer other than what they would have to perform themselves. What we want to do is take the customers knowledge and apply into RTS for a win-win situation.

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