Siemens SG8158-00 manual Min/Max Logs, Current Minimum/Maximum Log

Data Acquisition

7

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

7.3.1Current 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.

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

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.

44 Siemens Energy & Automation, Inc.