Sel 411L - Fault Location; Figure 3.72 Sample TEC Command Response; Figure 3.73 Sample TEC N Command Response

P.3.123
Date Code 20151029 Protection Manual SEL-411L Relay
Protection Functions
Fault Location
Time Error Command
(TEC)
The TEC serial port command provides easy access to the time-error function.
See TEC on page P.15.57 for command access level information.
Enter the TEC command to view the time-error status. A sample display is
given in Figure 3.72.
=>TEC <Enter>
Relay 1 Date: 11/02/2004 Time: 11:25:50.460
Station A Serial Number: 0000000000
Time Error Correction Preload Value
TECORR = 0.000 s
Relay Word Elements
LOADTE = 0, STALLTE = 0, FREQOK = 1
Accumulated Time Error
TE = -7.838 s
=>
Figure 3.72 Sample TEC Command Response
Enter the TEC command with a single numeric argument n (–30.000  n 
30.000) to preload the TECORR value. This operation does not affect the TE
analog quantity until the SEL
OGIC control equation LOADTE next asserts.
Figure 3.73 shows an example of the TEC n command in use.
==>TEC 2.25 <Enter>
Relay 1 Date: 11/02/2004 Time: 11:53:12.701
Station A Serial Number: 0000000000
Change TECORR to 2.250 s:
Are you sure (Y/N)?Y <Enter>
Time Error Correction Preload Value
TECORR = 2.250 s
Relay Word Elements
LOADTE = 0, STALLTE = 0, FREQOK = 1
Accumulated Time Error
TE = -5.862 s
==>
Figure 3.73 Sample TEC n Command Response
Fault Location
The relay uses three different methods to compute the fault location.
1. Traveling Wave (TW)
2. Impedance-based using total current polarization (ME, multi-ended)
3. Impedance-based using local current polarization (SE, single-ended)
The summary report shows the result of one of the two impedance-based
methods (ME or SE). Depending on the availability of input data and
supervising conditions, it also provides fault location from the traveling wave
method.
OUTPUTS Description
Analog Quantity
TE Time-error estimate, in seconds. Positive numbers indicate that the ac
clock would be fast (ahead of the reference clock). Negative numbers indi-
cate that the ac clock would be slow (behind the reference clock).
Relay Word bit
PLDTE Preload time-error value updated. This element asserts for approximately
1.5 cycles after TECORR is changed by the TEC command or by DNP3.
Table 3.58 Time-Error Calculation Inputs and Outputs (Sheet 2 of 2)