Table 2.3-4 50 Element Blocking Results; Table 2.3-5 Ansi Reset Standard Values; Table 2.3-6 Reset Time Results - Siemens 7PG2113 Technical Manual

2.3.2.1 Element Blocking
The Phase Overcurrent elements can be blocked by Binary Input Inhibit, VT Supervision and Inrush Detector
operation, as well as 79 Autoreclose settings for Inst/Delayed. The Characteristic can be modified by Cold Load
(51-n only) and Voltage Controlled Overcurrent and can be made non-directional by VT Supervision. This
functionality should be checked.
Element BI Inhibits
51-1
51-2
51-3
51-4
50-1
50-2
50-3
50-4
2.3.2.2 ANSI Reset
If the element is configured as an ANSI characteristic, it may have an ANSI (decaying) reset delay applied. If
ANSI reset is selected for 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 Time multiplier
(TM) = 1.0. The reset curve characteristic type and TM is defined by the operating characteristic.
Curve
ANSI-MI
ANSI-VI
ANSI-EI
Apply current in the following sequence, a) 2x setting for a time to ensure element operation, b) Zero current for
the 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.
Operate Reset time
time (calculated)
(expected)
Check correct indication, trip output, alarm contacts, waveform record.
©2010 Siemens Protection Devices Limited
VTS action
Table 2.3-4 50 Element Blocking Results
Fully operated to reset with Zero current applied & TM=1 (secs)
Table 2.3-5 ANSI reset standard values
Operate time 50% Reset
(measured) Time
(calculated)
First test (c)
Table 2.3-6 Reset Time Results
7PG2113/4/5/6 Commissioning & Maintenance
Inrush Detector 79 Autoreclose
4.85
21.6
29.1
50% operate 50% operate time
time (measured)
(calculated)
Second Test (c)
Chapter 6 Page 26 of 77