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Siemens 7SR21 Manual
Also see for Argus 7SR21: Installation guideManualTechnical manualManualManual
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7SR21 & 7SR22 Argus Commissioning and Maintenance©2010 Siemens Protection Devices Limited Chapter 6 Page 36 of 692.8.3.2 ANSI ResetIf the element is configured as an ANSI characteristic, it may have a reset delay applied. If ANSI reset is selectedfor an IEC characteristic element, the reset will be instantaneous.ANSI reset times from operated condition to fully reset are as follows for zero applied current and TM = 1.0. Thereset curve characteristic type and TM is defined by the operating characteristic.Curve Fully operated to reset with Zero current applied & TM=1 (secs)ANSI-MI 4.85ANSI-VI 21.6ANSI-EI 29.1Apply current in the following sequence, a) 2x setting for a time to ensure element operation, b) Zero current forthe reset time above (xTM), c) 2x setting for a time to ensure element operation. Check that the second operation(c) is similar to the first (a) and in line with the expected operate time for the element at this current level.Repeat the test with the reset time (b) reduced to 50% of the previous value. Ensure that the second operate time(c) is 50% of the first (a) operate time.Check correct indication, trip output, alarm contacts, waveform record.Operate time(expected)Reset time(calculated)Operate time(measured)50% ResetTime(calculated)50% operatetime(calculated)50% operatetime(measured)First test (c) Second Test (c) |
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