VJP outputs are Δα> Alarm, Trip and Blocked signals. Both alarm and trip signals do have an individual
pick-up setting. Blocking signal and setting group selection controls the operating characteristics of
the function during normal operation. Setting parameters are static inputs for the function which are
changed only by user input in the setup phase of the function. Vector jump function utilizes total of
eight separate setting groups which can be selected from one common source.
The operational logic consists of input magnitude processing, input magnitude selection, threshold
comparator, two block signal checks (undervoltage block or stage external signal), time delay
characteristics and output processing.
Inputs for the function are the available stages, setting parameters and measured and pre-processed
voltage magnitudes and binary input signals. Function outputs ALARM, TRIP and BLOCKED signals
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 signals. When tripping, the function
outputs ALARM and TRIP events simultaneously with equivalent time stamp. Time stamp resolution is
1ms. Function provides also cumulative counters for ALARM, TRIP and BLOCKED events.
In the following gure is presented the simpli ed function block diagram of the VJP function.
Figure. 5.4.20. - 92. Simpli ed function block diagram of the VJP function.
Measured input values
Analog voltage measurement values are used for the function block. Function block utilizes always
complex measurement from samples. For the pre-fault data registering, -20 ms averaged value of the
selected magnitude is used.
Table. 5.4.20. - 157. Analogic magnitudes used by the VJP function.
Signal
Description
Time base
U
1
L-L
Measured Line-to-Line voltage U
1
/V
5 ms
U
2
L-L
Measured Line-to-Line voltage U
2
/V
5 ms
U
3
L-L
Measured Line-to-Line voltage U
3
/V
5 ms
U
1
L-N
Measured Line-to-Neutral voltage U
1
/V
5 ms
AQ-F255
Instruction manual
Version: 2.00
© Arcteq Relays Ltd
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