6468
101
UPW1
4
Block ON
6469
101
UPW1
5
Block OFF
In the register of the UPW function is recorded start, trip or blocked “On” event process data. In the
table below is presented the structure of UPW function register content. This information is available in
12 last recorded events for all provided instances separately.
Table. 5.4.18. - 152. Register content.
Date & Time
Event code
Trigger
power
Fault power
Prefault power
Trip time
remaining
Used
SG
dd.mm.yyyy
hh:mm:ss.mss
6464-6469
Descr.
Start average
power
Trip -20ms
averages
Start -200ms
averages
0ms -1800s
1 - 8
5.4.19. Reverse power Pr (32R)
Reverse power function (RPW) is used for instant- and time delayed active reverse power protection. In
generator protection applications reverse power protection function is used to prevent damage in
situations where synchronous generator is running like a motor when the generator draws active
power. Reverse power protection isn’t used to protect the generator itself but to protect the generators
turbine.
Outputs of the function are Start Trip and Blocked signals. Setting parameters are static inputs for the
function which are changed only by user input in the setup phase of the function. Reverse power
function utilizes total of eight separate setting groups which can be selected from one common source.
The function can operate on instant or time delayed mode.
The operational logic consists of input magnitude processing, threshold comparator, two block signal
check, time delay characteristics and output processing.
Inputs for the function are the operating mode selections, setting parameters and measured and pre-
processed power magnitudes and binary input signals. Function outputs START, TRIP and BLOCKED
signals which can be used for direct IO controlling and also for user logic programming. The function
registers its operation into 12 last time-stamped registers and also generates general time stamped
ON/OFF events to the common event buffer from each of the three output signal. In instant operating
mode the function outputs START and TRIP events simultaneously with equivalent time stamp. Time
stamp resolution is 1ms. Function provides also cumulative counters for START, TRIP and BLOCKED
events.
In the following gure is presented the simpli ed function block diagram of the RPW function.
Figure. 5.4.19. - 91. Simpli ed function block diagram of the RPW function.
AQ-F255
Instruction manual
Version: 2.00
159
© Arcteq Relays Ltd
