Oscillographic Fault Records; Functional Description; Setting Notes - Siemens SIPROTEC 4 7VK61 Manual

No. Information
590 Line closure
591 1pole open L1
592 1pole open L2
593 1pole open L3

Oscillographic Fault Records

2.1.6
2.1.6.1

Functional Description

The 7VK61 is equipped with a fault recording function. The instantaneous values of the measured quantities
i , i , i , i or i
L1 L2 L3 E
i , i , i , i and u
L1 L2 L3 E
(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). For a fault, the data are stored for an adjustable period of time, but no more
than 5 seconds per fault. A total of 8 faults can be saved spanning a total time of 15 s maximum. The fault
record memory is automatically updated with every new fault, so that no acknowledgment is required. The
storage of fault values can be started by pickup of a protection function, as well as via binary input and via the
serial interface.
The data can be retrieved via the serial interfaces by means of a personal computer and evaluated with the
operating software DIGSI and the graphic analysis software SIGRA 4. The latter graphically represents the data
recorded during the system fault and calculates additional information such as the impedance or r.m.s. values
from the measured values. A selection may be made as to whether the currents and voltages are represented
as primary or secondary values. Binary signal traces (marks) of particular events, e.g. "fault detection", "trip-
ping" are also represented.
If the device has a serial system interface, the fault recording data can be passed on to a central device via this
interface. Data are evaluated by appropriate programs in the central device. Currents and voltages are referred
to their maximum values, scaled to their rated values and prepared for graphic presentation. Binary signal
traces (marks) of particular events e.g. "fault detection", "tripping" are also represented.
In the event of transfer to a central device, the request for data transfer can be executed automatically and
can be selected to take place after each fault detection by the protection, or only after a trip.
2.1.6.2

Setting Notes

General
Other settings pertaining to fault recording (waveform capture) are found in the submenu Oscillographic
Fault Records submenu of the Settings menu. Waveform capture makes a distinction between the trigger
instant for an oscillographic record and the criterion to save the record (address402 WAVEFORMTRIGGER).
This parameter can only be altered in DIGSI at Display Additional Settings. Normally the trigger instant is the
device pickup, i.e. the pickup of an arbitrary protection function is assigned the time. The criterion for saving
may be both the device pickup(Save w. Pickup) or the device trip Save w. TRIP). A trip command
issued by the device can also be used as trigger instant (Start w. TRIP), in this case it is also the saving
criterion.
An oscillographic fault record includes data recorded prior to the time of trigger, and data after the dropout of
the recording criterion. Usually this is also the extent of a fault recording (address 403 WAVEFORM DATA =
Fault event). If automatic reclosure is implemented, the entire system disturbance — possibly with several
reclose attempts — up to the ultimate fault clearance can be stored (address 403 WAVEFORM DATA =
Pow.Sys.Flt.). This facilitates the representation of the entire system fault history, but also consumes
storage capacity during the auto reclosure dead time(s). This parameter can only be altered in DIGSI at Display
Additional Settings.
The actual storage time encompasses the pre-fault time PRE. TRIG. TIME (address 411) ahead of the refer-
ence instant, the normal recording time and the post-fault time POST REC. TIME (address 412) after the
SIPROTEC 4, 7VK61, Manual
C53000-G1176-C159-5, Edition 05.2018
Type of
Informa-
tion
OUT
OUT
OUT
OUT
, i , i and u , u , u , u
EE p y L1 L2 L3 en
, u , u , u
L1 L2 L3 4
Comments
Line closure detected
Single pole open detected in L1
Single pole open detected in L2
Single pole open detected in L3
or u or u or 3·u
sync x 0
Functions
2.1 General
41