Table of Contents
Advertisement
Functions
2.9 Auxiliary Functions
Figure 2-68 shows an example of a preset default display.
Various default displays can be selected via the arrow keys. Parameter 640 can be set to change the default
setting for the default display page shown in idle state. Two examples of possible default display selections are
given below.
Figure 2-68
Besides performance data and frequency, default display 4 shows the measured values U
Figure 2-69
Moreover, the device has several event buffers for operational indications, fault indications, switching statistics,
etc., which are protected against loss of auxiliary supply by means of a backup battery. These indications can
be displayed on the LCD at any time using the keypad or transferred to a personal computer via the serial
service or operator interface. The retrieval of indications during operation is extensively described in the
SIPROTEC 4 System Description (Order No. E50417-H1176-C151).
After a fault on the system, for example, important information about the progression of the fault can be re-
trieved, such as the pickup of a protective element or the initiation of a trip signal. The time the initial occurrence
of the short circuit fault occurred is accurately provided via the system clock. The progress of the disturbance
is output with a relative time referred to the instant of fault detection, so that the duration of a fault until tripping
and up to reset of the trip command can be ascertained. The resolution of the time information is 1ms.
With a PC and the DIGSI software it is also possible to retrieve and display the events conveniently visualized
on a monitor and a menu-guided dialog. The data can either be printed on a connected computer or stored for
later evaluation elsewhere.
The protection device stores the messages of the last eight system faults; in the event of a ninth fault, the oldest
is erased.
A system fault starts with the recognition of the fault by the fault detection of any protection function and ends
with the reset of the fault detection of the last protection function or after the expiry of the auto-reclose reclaim
time, so that several unsuccessful auto-reclose cycles are also stored cohesively. Accordingly a system fault
may contain several individual fault events (from fault detection up to reset of fault detection).
Information to a Control Centre
If the device has a serial system interface, stored information may additionally be transferred via this interface
to a centralized control and storage device. Several communication protocols are available for the transfer of
this information.
You may test whether the indications are transmitted correctly with DIGSI.
164
Example of a default display in a 4-line display
Operational measured values in the default display
L1-L2
SIPROTEC, 7VK61, Manual
C53000-G1176-C159-3, Release date 05.2009
and I
.
L2
Advertisement
Table of Contents
