Timer Characteristics - ABB RELION REX640 Technical Manual

1MRS759142 C
9.10.5.7
REX640
Technical Manual
Communication and the MCC mode
The phasor information from the other parallel protection relays is needed for the
circulating current calculation. Therefore, horizontal GOOSE communication is
needed between protection relays when the MCC principle is used.
The transferred current phasor information contains a primary value of the measured
current. The magnitude and angle of the current phasor can be read from the OLGAPC
function input data TR_I_AMPL and TR_I_ANGL, respectively.
The sent phasor information always represents the difference between the voltage
phasor U_A and current phasor I_A. The information about the current phasor can be
read from the monitored data TR0_I_AMPL and TR0_I_ANGL. The allowed active
operation modes for sending data are MCC or Manual, both with the input
CON_STATUS activated. The communication is active when the sent and received
phasor magnitude is not clamped to zero. The communication phasor magnitude is
zero due to a rejected active operation mode or too low signal magnitudes (see
and current measurements
corresponding transformer is connected to the network and its current affects the
circular current of other transformers even when it is in the manual operating mode.

Timer characteristics

Operation timer functionality
The delay times can be set to follow either the definite time characteristic or the
inverse time characteristic with the Delay characteristic setting. By default, the
"Definite time" mode is selected. The timer mode cannot be changed between cycles
T1 and T2, but only either before T1 has started or after T2 has elapsed.
Table 1413: Different timer mode delays
Timer mode Setting
Control delay time 1
T1
Control delay time 2
T2
The delay after the command pulse activation and the restart of the timer is six
seconds. The delay is assumed to be the tap changer operating delay. The timer status
can also be read from the monitoring data TIMER_STS, where T1 active gives a value
"Lower timer1 on" or "Raise timer1 on" while T2 active gives a value "Lower timer2
on" or "Raise timer2 on". Furthermore, the "Fast lower T on" value indicates that the
fast lower control functionality is active
Activation of operation timer also activates the TIMER_ON output.
chapter). Active CON_STATUS indicates that the
Description
First delay when the measured voltage
exceeds or falls below the limit value
Second delay when the first control did not
bring the measured voltage to a desired
level
(Blocking scheme
Section 9
Control functions
Voltage
chapter).
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