Siemens SG8158-00 manual Data Acquisition, Event Log, Trip Logs

Data Acquisition

7 Data Acquisition

The ISGS relay provides several forms of data acquisition and display to give the user the most comprehensive picture of the power system. This data includes:

•event log for monitoring functions and status changes

•trip logs, including date and time of trip

•minimum/maximum logs for storing metering data

•individual metering data

•waveform captures

7.1 Event Log

The event log is a chronological record of the last 127 signifi- cant events that occur during operation of the relay and is stored in nonvolatile memory. These events include opera- tional events, such as enabling or disabling protective ele- ments; and fault events, such as pickup and trip. Each entry in the log provides a description of the event and its time (to nearest millisecond) and date of occurrence.

The event log cannot be viewed through the ISGS relay oper- ator panel. It can only be viewed after being retrieved through one of the relay communication ports using either Wisdom or WinPM software.

Figure 7.1 Sample Event Log (viewed with Wisdom)

Events that require special attention appear in the event log in red when displayed on a PC. The entire event log can be saved to a file (for later viewing or printing) using Wisdom software. For information on Wisdom software, refer to Chapter 8.

Whenever the ISGS relay resets, such as when changing parameter sets or output control actions, the event log is considered invalid and all events are re-read by communica- tions.

7.2 Trip Logs

The Trip Logs function stores times and measured data present at the time of pickup and trip for the last eight trip events. The information for each trip is stored in its own log. These eight logs are located at address blocks 5100 through 5800. The most recent trip event is stored under address 5100 and the oldest of the eight trip events is stored in address 5800. Pressing the Trip Log key takes you directly to the trip log address block. The first trip to be sensed is the trip to be logged

Figure 7.2 Sample Trip Log Data Display (from Wisdom)

5100 to	Trip Logs
5800
Address	Data	Description
001	Trip Number	Date and event record number
002	Pickup Time	Time of the event to the nearest
		millisecond
003	Pickup	The function that picked up
004	Phase	The phase that picked up
005	I1	Current at pickup for phase 1
006	I2	Current at pickup for phase 2
007	I3	Current at pickup for phase 3
008	IN	Ground current at pickup
009	V1	Voltage at pickup phase 1 (1-2*)
010	V2	Voltage at pickup phase 2 (2-3*)
011	V3	Voltage at pickup phase 3 (3-1*)
012	Trip	The function that caused the trip
013	Phase	The phase that caused the trip
014	I1	Secondary current at trip for phase 1
015	I2	Secondary current at trip for phase 2
016	I3	Secondary current at trip for phase 3
017	IN	Secondary Ground current at trip
018	V1	Secondary voltage at trip phase 1
		(1-2*)
019	V2	Secondary voltage at trip phase 2
		(2-3*)
020	V3	Secondary voltage at trip phase 3
		(3-1*)
021	TinPU	Total time in pickup
022	End of Table	Last entry in this log

* If VTs are connected line-to-line (see address 1202, Section 4.5), the line-to-line voltage is displayed.

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