Control Output; Figure 2-5: V-Rtu2000 Chatter Filter Diagram - Veesta World V-RTU2000 Series Technical Information

V-RTU2000 Series
Veesta - Remote Terminal Unit
Technical Specification Manual
2.2.1.6 Sequence of Event Report
2.2.2

Control Output

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Example: Chatter Times (changes) 5, Lock-Out Time 1s.
Time base period
Signal after
1 2 3 4 5
debounce level
debounce time
Filter's state
ON
Signal after
chatter filter

Figure 2-5: V-RTU2000 Chatter Filter Diagram

In order to monitor the status and sequence, changed of main
equipments, RTU provides the SOE function (Sequence Of Event).
An event is defined as a single change of state. Each time an event
is detected, RTU will time-tag the event, and store a description of
the event and the time-tag in a first in first out (FIFO) buffer. There is
one 1024 events buffer in V-RTU2000 Series.
RTU will time-tag the first change of state, rather than the end of de-
bounce period, and the de-bounce time for all SOE points can be
1ms to 250ms adjustable. The resolution is one millisecond. The
time-tag recorded with each event is generated from a clock internal
to the V-RTU2000 Series. The clock is 1 PPM accuracy TCXO.
V-RTU2000 Series have the capability to synchronize its internal
clock with a system clock located at the master station. If the
synchronization period is no more than 15 minutes, it can guarantee
the time accuracy of SOE is within +/- 4ms to system clock (in Master
Station).
Two types of control command can be transmitted from the Master
Station to devices in the Power System via the V-RTU2000 Series.
One is Trip/Close command, the other is Direct Set-point command.
Chapter 2 - System Overview
Time base period Lock-out period
No Transitions >=5
No changes Lock-
out period
Chatter filter is ON
No transitions during
OFF
lock-out period
Chatter filter is OFF
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