Schweitzer Engineering Laboratories SEL-751 - Table 7.29 LOG HIF Command; Figure 7.28 LOG H (HIF) Command Response

7.41
Date Code 20170927 Instruction Manual SEL-751 Relay
Communications
Communications Protocols
Figure 7.28 provides an example of LOG H (HIF) command report.
LOOPBACK Command
Use the LOO command (see Table 7.30) for testing the MIRRORED BITS
communications channel for proper communication. For more information on
M
IRRORED BITS, see Appendix J: MIRRORED BITS Communications.
.
With the transmitter of the communications channel physically looped back to
the receiver, the M
IRRORED BITS addressing is wrong and ROK is deasserted.
The LOO command tells the M
IRRORED BITS software to temporarily expect
to see its own data looped back as its input. In this mode, LBOK asserts if
Ta b l e 7. 29 LO G HI F Co m m a n d
Command Description Access Level
LOG HIF nnn Displays the progress of high-impedance fault (HIF)
detection.
1
NOTE:
➤ Odd-harmonic alarm and fault values ALG.1 A, ALG.1 B, and ALG.1 C for Phases
A, B, and C in percent of preset alarm and fault thresholds.
➤ Non-harmonic alarm and fault values ALG.2 A, ALG.2 B, and ALG.2 C for Phases
A, B, and C in percent of preset alarm and fault thresholds.
➤ HI1 and HI2 are the digital outputs of the odd-harmonic and non-harmonic alarm and
fault detection logic. The HIF odd-harmonic alarm and fault output bits under HI1 are
HIA1_A, HIA1_B, HIA1_C, and HIF1_A, HIF1_B, HIF1_C, respectively and the
HIF non-harmonic alarm and fault output bits under HI2 are HIA2_A, HIA2_B,
HIA2_C, and HIF2_A, HIF2_B, HIF2_C, respectively. These Relay Word bits assert
when the corresponding percentage values reach 100%.
=>>LOG HIF <Enter>
SEL-751 Date: 04/11/2011 Time: 16:07:15.933
FEEDER RELAY Time Source: Internal
Date Time Percent ALG.1A ALG.1B ALG.1C ALG.2A ALG.2B ALG.2C HI1 HI2
03/28/2011 14:47:48.327 ALARM 0.00 0.00 0.00 100.00 5.00 5.00 000 000
FAULT 0.00 0.00 0.00 100.00 100.00 100.00 000 000
Date Time Percent ALG.1A ALG.1B ALG.1C ALG.2A ALG.2B ALG.2C HI1 HI2
03/28/2011 14:47:51.342 ALARM 0.00 0.00 0.00 100.00 5.00 5.00 000 000
FAULT 0.00 0.00 0.00 100.00 100.00 33.33 000 000
Date Time Percent ALG.1A ALG.1B ALG.1C ALG.2A ALG.2B ALG.2C HI1 HI2
03/28/2011 14:47:52.338 ALARM 0.00 0.00 0.00 100.00 5.00 5.00 000 000
FAULT 0.00 0.00 0.00 100.00 100.00 33.33 000 000
=>>
Figure 7.28 LOG H (HIF) Command Response
Ta b l e 7. 3 0 LO O C o m m a n d
Command Description Access Level
LOO Enables loopback testing of MIRRORED BITS chan-
nels.
2
LOO A Enables loopback on M
IRRORED BITS Channel A
for the next 5 minutes.
2
LOO B Enables loopback on M
IRRORED BITS Channel B
for the next 5 minutes.
2