Measured Values Constellation; Functional Description; Oscillographic Fault Records - Siemens siprotec 7SD5 User Manual

2.24.7 Measured Values Constellation

2.24.7.1 Functional Description

The measured values constellation of the possible devices 1 to 6 are showed here by
evaluating the device (see Table 2-23). Information for further devices is given in the
Appendix.
The computation of this measured values constellation is also executed during an ex-
isting system fault in an interval of approx. 0.5 s.
Table 2-23 Measured values constellation for device 1
No. Information
7761 „Relay ID"
7762 „IL1_opN="
7763 „ΦI L1="
7764 „IL2_opN="
7765 „ΦI L2="
7766 „IL3_opN="
7767 „ΦI L3="
7769 „UL1_opN="
7770 „ΦU L1="
7771 „UL2_opN="
7772 „ΦU L2="
7773 „UL3_opN="
7774 „ΦU L3="

2.24.8 Oscillographic Fault Records

2.24.8.1 Functional Description
The general line protection 7SD5 is equipped with a fault recording function. The in-
stantaneous values of measured values
i
(voltages depending on the connection) are sampled at intervals of 1 ms (for 50 Hz)
and stored in a circulating buffer (20 samples per cycle). During a system fault these
data are stored over a time span that can be set (5 s at the longest for each fault
record). Up to 8 faults can be stored. The total capacity of the fault record memory is
approx. 15 s. The fault recording buffer is updated when a new fault occurs, so that
acknowledging is not necessary. In addition to storage of the fault recording by the pro-
tection fault detection, this may also be initiated via binary input, the integrated keypad
and display, or via the serial operator or service interface.
For the differential protection system of a protected object, all fault records of all ends
are synchronized by time management features. This ensures that all fault records
operate with exactly the same time basis. Therefore, equal measured values are co-
incident at all ends.
7SD5 Manual
C53000-G1176-C169-1
Type of In-
formation
MW
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MW
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MW
, i , i , 3 , u , u , u
L1 L2 L3 i0 L1 L2 L3
Device address of the device
IL1 (% of nominal operational current)
Angle IL1_remote <-> IL1_local
IL2 (% of nominal operational current)
Angle IL2_remote <-> IL2_local
IL3 (% of nominal operational current)
Angle IL3_remote <-> IL3_local
UL1 (% of nominal operational voltage)
Angle UL1_remote <-> UL1_local
UL2 (% of nominal operational voltage)
Angle UL2_remote <-> UL2_local
UL3 (% of nominal operational voltage)
Angle UL3_remote <-> UL3_local
, 3 u as well as I , I
0 diffL1 diffL2
2.24 Ancillary Functions
Comments
, I , I , I , I
diffL3 RestL1 RestL2 RestL3
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