Siemens ISGS SG8158-00 - Manual (Page 50)

Data Acquisition
44 Siemens Energy & Automation, Inc.
For each log the following applies:
• The ISGS relay keeps a lifetime count of protective func-
tion trips. The trip number (address 001) is the count at
the time of the trip. The trip number cannot be reset
unless the relay is returned to the factory.
• The pickup time (002) consists of the date and time of
the event to the nearest millisecond.
• The pickup parameter (003) refers to the protective
function that caused the trip. Only protective function
trips are stored in the log (no breaker monitoring, set-
points, or communications trips are logged).
• The phase parameter (004) stores the current or voltage
phase(s) that violated protective function settings.
• I1, I2, I3, and IN parameters (005 to 008) give the cur-
rents at pickup for phases A, B, C, and the ground cur-
rent.
• V1, V2, and V3 (009 to 011) indicate the voltage at
pickup for phases A, B, and C. If VTs are connected line-
to-line (refer to address 1202, Section 4.5, the line-to-
line voltage is displayed for phases A-B, B-C, and C-A.
• Trip (012) displays the function that caused the trip.
• Phase (013) indicates the phase that caused the trip.
• I1, I2, I3, and IN (014 to 017) give the secondary cur-
rents at trip for phases A, B, C, and the ground current.
• V1, V2, and V3 (018 to 020) indicate the voltage at
pickup for phases A, B, and C. If VTs are connected line-
to-line (refer to address 1202, Section 4.5, the line-to-
line voltage is displayed for phases A-B, B-C, and C-A.
• Total time in pickup (021) is the total time that the relay
read the voltage above the pickup value, not the time
the breaker is told to open or actually opens. The timer
is only reset when no function is in pickup.
Events that require special attention appear in the event log
in red when displayed on a PC. For information on Wisdom
software, refer to Chapter 8.
7.3 Min/Max Logs
7.3.1 Current Minimum/Maximum Log
The Current Minimum/Maximum Log function allows the dis-
play of minimum and maximum values measured by the
relay. The collected information is compared against previ-
ously stored values and the log is updated. All logged values
are time stamped and resetting the log (see Section 6.7) will
reset all log values.
The MinTHD and MaxTHD parameters (4619 and 4620) dis-
play the minimum or maximum total harmonic distortion cal-
culation for the average current. The calculation is an
estimate of the harmonics on the system rather than an
exact measurement.
4600 Current Minimum/Maximum Log
Address Data Description
4601 I1 min Phase A minimum current
4602 I1 max Phase A maximum current
4603 I2 min Phase B minimum current
4604 I2 max Phase B maximum current
4605 I3 min Phase C minimum current
4606 I3 max Phase C maximum current
4607 IN min Ground minimum current
4608 IN max Ground maximum current
4609 IAv min Average minimum current
4610 IAv max Average maximum current
4611 I1 dmin Phase A minimum demand
current
4612 I1 dmax Phase A maximum demand
current
4613 I2 dmin Phase B minimum demand
current
4614 I2 dmax Phase B maximum demand
current
4615 I3 dmin Phase C minimum demand
current
4616 I3 max Phase C maximum demand
current
4617 IAv dmin Average minimum demand
current calculated
4618 IAv dmax Average maximum demand
current calculated
4619 MinTHD Minimum value of estimated
total harmonic distortion
4620 MaxTHD Maximum value of estimated
total harmonic distortion
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